commit 3796ec5cd2bbc1b437a2278985a3a0d913b925e1
Author: 小林泉酱 <xiaolinquanchann@gmail.com>
Date:   Fri Nov 6 01:04:35 2026 +0800

    First Commit

diff --git a/Projects/.gitignore b/Projects/.gitignore
new file mode 100644
index 0000000..6447480
--- /dev/null
+++ b/Projects/.gitignore
@@ -0,0 +1,6 @@
+build*/
+*.user
+*.user.*
+*.autosave
+.DS_Store
+
diff --git a/Projects/01_UnitConverter/CMakeLists.txt b/Projects/01_UnitConverter/CMakeLists.txt
new file mode 100644
index 0000000..f2de709
--- /dev/null
+++ b/Projects/01_UnitConverter/CMakeLists.txt
@@ -0,0 +1,33 @@
+cmake_minimum_required(VERSION 3.16)
+project(UnitConverter VERSION 1.0 LANGUAGES CXX)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
+find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)
+if(QT_VERSION_MAJOR EQUAL 5 AND Qt5Core_VERSION VERSION_LESS 5.14.2)
+    message(FATAL_ERROR "Qt 5.14.2 or newer is required.")
+endif()
+if(QT_VERSION_MAJOR EQUAL 6)
+    set(CMAKE_CXX_STANDARD 17)
+endif()
+if(MSVC)
+    add_compile_options(/utf-8)
+else()
+    add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+add_executable(UnitConverter WIN32 main.cpp appearance.h mainwindow.cpp mainwindow.h conversion.cpp conversion.h mainwindow.ui)
+target_link_libraries(UnitConverter PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
+option(BUILD_TEACHING_TESTS "Build teaching project tests" OFF)
+if(BUILD_TEACHING_TESTS)
+    enable_testing()
+    find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Test)
+    add_executable(test_UnitConverter tests/test_UnitConverter.cpp mainwindow.cpp mainwindow.h
+                   conversion.cpp conversion.h mainwindow.ui)
+    target_include_directories(test_UnitConverter PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+    target_link_libraries(test_UnitConverter PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Test)
+    add_test(NAME UnitConverter COMMAND test_UnitConverter -platform offscreen)
+endif()
+
diff --git a/Projects/01_UnitConverter/README.md b/Projects/01_UnitConverter/README.md
new file mode 100644
index 0000000..0d0ed94
--- /dev/null
+++ b/Projects/01_UnitConverter/README.md
@@ -0,0 +1,59 @@
+# 项目一：单位换算器
+
+适合第2—3章讲解信号槽、组件访问和函数分工，第4章可继续练习下拉框与字符串处理。
+
+## 运行后试什么
+
+初始输入为 25，源单位为摄氏度，目标单位为华氏度。点击“换算”，应显示 77 °F，并在下方显示公式。也可以在输入框内按 Enter。
+
+切换到长度后，默认将米换成厘米。输入 1，结果应为 100 cm。“交换单位”只交换源单位与目标单位，输入值保持不变。修改输入或单位会清空旧结果，防止把上次的答案当成当前答案。
+
+支持摄氏度、华氏度、开尔文，以及毫米、厘米、米、千米、英寸和英尺。结果最多显示 12 位有效数字。
+
+## 课堂任务
+
+第一步只保留温度输入、换算按钮和结果框。让学生完成摄氏度到华氏度的换算，并解释输入框返回的是字符串，计算需要数值。
+
+第二步加入返回值检查。分别输入空字符串、abc 和 25.5，观察程序怎样决定是否继续计算。当前工程用完整字符串的格式检查配合 toDouble，支持小数和科学计数法，不接受千位分隔符。
+
+第三步加入源单位和目标单位。先统一到摄氏度，再计算目标温度。让学生画出华氏度到开尔文的两步过程，避免只背诵一个总公式。
+
+第四步加入长度换算。单位比例写在数组中，先解释数组下标与下拉框顺序的对应关系，再讨论增加一个单位时需要修改哪些位置。
+
+## 一次换算怎样完成
+
+1. convertButton 发出 clicked 信号，调用 convertValue。
+2. 主窗口读取 inputEdit 的文本和两个下拉框的索引。
+3. Conversion::convert 检查输入，计算结果，返回 Result。
+4. 主窗口根据 Result::ok 显示结果或错误原因。
+5. 计算成功后允许复制；输入变化后立即禁用复制并清除旧结果。
+
+Conversion::convert 不直接操作输入框或标签，因此可以使用不同界面调用，也可以单独测试。
+
+## 需要解释的条件
+
+- 温度不能低于绝对零度。摄氏度下限为 −273.15，华氏度下限为 −459.67，开尔文下限为 0。
+- 边界比较保留极小的浮点误差余量，防止换算时的舍入把绝对零度判为非法值。
+- 本工具中的长度表示非负长度，不表示带方向的坐标位移。
+- 输入可以合法，但结果仍可能溢出。输入检查和结果检查分别负责两个阶段。
+- 显示的有效数字有限，程序不承诺任意精度计算。
+
+## 学生练习
+
+1. 增加“码”，已知 1 yd = 0.9144 m。检查它与米、英尺之间的换算。
+2. 增加“使用本次结果继续换算”按钮，说明它与“交换单位”的区别。
+3. 为结果增加可选择的显示精度，并解释显示精度为什么不等于计算精度。
+
+## 验收用例
+
+| 操作 | 预期 |
+|---|---|
+| 0 °C → °F | 32 |
+| 212 °F → °C | 100 |
+| −459.67 °F → K | 0 |
+| −274 °C → K | 显示低于绝对零度的提示 |
+| 1 in → cm | 2.54 |
+| 1 ft → m | 0.3048 |
+| 输入 12abc、nan 或 1,000 | 拒绝计算 |
+| 算出结果后修改输入 | 旧结果清空，复制按钮不可用 |
+
diff --git a/Projects/01_UnitConverter/UnitConverter.pro b/Projects/01_UnitConverter/UnitConverter.pro
new file mode 100644
index 0000000..7174d47
--- /dev/null
+++ b/Projects/01_UnitConverter/UnitConverter.pro
@@ -0,0 +1,10 @@
+QT += widgets
+CONFIG += c++14
+greaterThan(QT_MAJOR_VERSION, 5): CONFIG += c++17
+TEMPLATE = app
+TARGET = UnitConverter
+SOURCES += main.cpp mainwindow.cpp conversion.cpp
+HEADERS += mainwindow.h conversion.h
+FORMS += mainwindow.ui
+msvc: QMAKE_CXXFLAGS += /utf-8
+
diff --git a/Projects/01_UnitConverter/appearance.h b/Projects/01_UnitConverter/appearance.h
new file mode 100644
index 0000000..16d3436
--- /dev/null
+++ b/Projects/01_UnitConverter/appearance.h
@@ -0,0 +1,34 @@
+#pragma once
+#include <QApplication>
+#include <QFont>
+#include <QStyleFactory>
+
+inline void applyAppearance(QApplication &app)
+{
+    app.setStyle(QStyleFactory::create(QStringLiteral("Fusion")));
+    app.setFont(QFont(QStringLiteral("Microsoft YaHei UI"), 11));
+    app.setStyleSheet(QStringLiteral(
+        "QMainWindow { background: #f5f7fb; }"
+        "QLabel { color: #23364c; }"
+        "QLabel#titleLabel { font-size: 27px; font-weight: bold; color: #173b63; }"
+        "QLabel#subtitleLabel, QLabel#helpLabel { color: #52657a; }"
+        "QGroupBox { background: white; border: 1px solid #d6e0eb;"
+        " border-radius: 8px; margin-top: 12px; padding: 18px 12px 12px; }"
+        "QGroupBox::title { subcontrol-origin: margin; left: 12px; padding: 0 6px; }"
+        "QLineEdit, QSpinBox, QComboBox { min-height: 32px; padding: 3px 8px; }"
+        "QLineEdit, QSpinBox, QComboBox, QPlainTextEdit, QListWidget"
+        " { background: white; color: #23364c; }"
+        "QPushButton { min-height: 34px; padding: 4px 14px; }"
+        "QPushButton#convertButton, QPushButton#startButton, QPushButton#drawButton,"
+        " QPushButton#applyButton, QPushButton#groupsButton { background: #255c93;"
+        " color: white; border: 1px solid #255c93; border-radius: 5px; }"
+        "QPushButton:disabled, QPushButton#convertButton:disabled,"
+        " QPushButton#startButton:disabled, QPushButton#drawButton:disabled,"
+        " QPushButton#applyButton:disabled, QPushButton#groupsButton:disabled"
+        " { color: #8995a3; background: #e6ebf1; border-color: #d6e0eb; }"
+        "QLabel#statusLabel { color: #185376; }"
+        "QLineEdit#resultEdit { font-size: 23px; min-height: 45px; color: #175e53; }"
+        "QLabel#timeLabel { font: bold 76px 'Consolas'; color: #173b63; }"
+        "QProgressBar { border: 1px solid #d6e0eb; border-radius: 6px; height: 14px; }"
+        "QProgressBar::chunk { background: #2b8a7d; border-radius: 5px; }"));
+}
diff --git a/Projects/01_UnitConverter/conversion.cpp b/Projects/01_UnitConverter/conversion.cpp
new file mode 100644
index 0000000..764ec06
--- /dev/null
+++ b/Projects/01_UnitConverter/conversion.cpp
@@ -0,0 +1,94 @@
+#include "conversion.h"
+#include <QRegularExpression>
+#include <cmath>
+
+namespace Conversion {
+QStringList units(Category category)
+{
+    if (category == Category::Temperature)
+        return {QStringLiteral("摄氏度 °C"), QStringLiteral("华氏度 °F"),
+                QStringLiteral("开尔文 K")};
+    return {QStringLiteral("毫米 mm"), QStringLiteral("厘米 cm"),
+            QStringLiteral("米 m"), QStringLiteral("千米 km"),
+            QStringLiteral("英寸 in"), QStringLiteral("英尺 ft")};
+}
+
+Result convert(const QString &text, Category category, int from, int to)
+{
+    Result result;
+    const QString input = text.trimmed();
+    // 先检查完整输入，避免把“12abc”误当成有效数值。
+    static const QRegularExpression number(
+        QStringLiteral("^[+-]?(?:[0-9]+(?:\\.[0-9]*)?|\\.[0-9]+)(?:[eE][+-]?[0-9]+)?$"));
+    if (!number.match(input).hasMatch()) {
+        result.error = QStringLiteral("请输入完整的数值，例如 25、-10.5 或 1e3；小数点使用英文句点。");
+        return result;
+    }
+    bool ok = false;
+    const double value = input.toDouble(&ok);
+    if (!ok || !std::isfinite(value)) {
+        result.error = QStringLiteral("输入超出了可计算的数值范围，请减小数值。");
+        return result;
+    }
+    const QStringList names = units(category);
+    if (from < 0 || to < 0 || from >= names.size() || to >= names.size()) {
+        result.error = QStringLiteral("请选择有效的单位。");
+        return result;
+    }
+    if (category == Category::Temperature) {
+        // 先统一为摄氏度，再换算为目标单位，避免为每对单位各写一套公式。
+        double celsius = value;
+        QString first;
+        if (from == 1) {
+            celsius = (value - 32.0) / 1.8;
+            first = QStringLiteral("先换成摄氏度：C = (F − 32) ÷ 1.8。");
+        } else if (from == 2) {
+            celsius = value - 273.15;
+            first = QStringLiteral("先换成摄氏度：C = K − 273.15。");
+        } else {
+            first = QStringLiteral("输入已经是摄氏度，可直接作为中间值。");
+        }
+        if (celsius < -273.15 - 1e-9) {
+            result.error = QStringLiteral("温度不能低于绝对零度：−273.15 °C / −459.67 °F / 0 K。");
+            return result;
+        }
+        // 允许边界处的浮点舍入误差，避免把绝对零度误判为非法输入。
+        if (celsius < -273.15)
+            celsius = -273.15;
+        QString second;
+        if (to == 1) {
+            result.value = celsius * 1.8 + 32.0;
+            second = QStringLiteral("再换成华氏度：F = C × 1.8 + 32。");
+        } else if (to == 2) {
+            result.value = celsius + 273.15;
+            second = QStringLiteral("再换成开尔文：K = C + 273.15。");
+        } else {
+            result.value = celsius;
+            second = QStringLiteral("目标是摄氏度，中间值就是结果。");
+        }
+        result.explanation = first + QStringLiteral("\n") + second;
+    } else {
+        if (value < 0.0) {
+            result.error = QStringLiteral("本工具换算的是长度，输入值不能为负数。");
+            return result;
+        }
+        const double metersPerUnit[] = {0.001, 0.01, 1.0, 1000.0, 0.0254, 0.3048};
+        result.value = value * (metersPerUnit[from] / metersPerUnit[to]);
+        result.explanation =
+            QStringLiteral("以米为统一单位：结果 = 输入值 × 源单位的米数 ÷ 目标单位的米数。\n"
+                           "本次计算：%1 × %2 ÷ %3。")
+                .arg(input)
+                .arg(metersPerUnit[from], 0, 'g', 12)
+                .arg(metersPerUnit[to], 0, 'g', 12);
+    }
+    if (!std::isfinite(result.value)) {
+        result.error = QStringLiteral("换算结果超出了可显示的数值范围。");
+        return result;
+    }
+    if (result.value == 0.0)
+        result.value = 0.0; // 避免显示 -0。
+    result.ok = true;
+    return result;
+}
+}
+
diff --git a/Projects/01_UnitConverter/conversion.h b/Projects/01_UnitConverter/conversion.h
new file mode 100644
index 0000000..5e59b92
--- /dev/null
+++ b/Projects/01_UnitConverter/conversion.h
@@ -0,0 +1,18 @@
+#pragma once
+#include <QString>
+#include <QStringList>
+
+namespace Conversion {
+enum class Category { Temperature, Length };
+
+struct Result {
+    bool ok = false;
+    double value = 0.0;
+    QString explanation;
+    QString error;
+};
+
+QStringList units(Category category);
+Result convert(const QString &text, Category category, int from, int to);
+}
+
diff --git a/Projects/01_UnitConverter/main.cpp b/Projects/01_UnitConverter/main.cpp
new file mode 100644
index 0000000..d8f1ee0
--- /dev/null
+++ b/Projects/01_UnitConverter/main.cpp
@@ -0,0 +1,19 @@
+#include "mainwindow.h"
+#include "appearance.h"
+#include <QApplication>
+#include <QFont>
+#include <QStyleFactory>
+
+int main(int argc, char *argv[])
+{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
+    QApplication app(argc, argv);
+    applyAppearance(app);
+    MainWindow window;
+    window.show();
+    return app.exec();
+}
+
diff --git a/Projects/01_UnitConverter/mainwindow.cpp b/Projects/01_UnitConverter/mainwindow.cpp
new file mode 100644
index 0000000..866d6ae
--- /dev/null
+++ b/Projects/01_UnitConverter/mainwindow.cpp
@@ -0,0 +1,83 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+#include "conversion.h"
+#include <QClipboard>
+#include <QApplication>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+    ui->categoryCombo->addItems({tr("温度"), tr("长度")});
+    connect(ui->categoryCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            this, &MainWindow::changeCategory);
+    connect(ui->convertButton, &QPushButton::clicked, this, &MainWindow::convertValue);
+    connect(ui->inputEdit, &QLineEdit::returnPressed, this, &MainWindow::convertValue);
+    connect(ui->inputEdit, &QLineEdit::textChanged, this, &MainWindow::clearResult);
+    connect(ui->fromCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            this, &MainWindow::clearResult);
+    connect(ui->toCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            this, &MainWindow::clearResult);
+    connect(ui->swapButton, &QPushButton::clicked, this, [this] {
+        const int previousFrom = ui->fromCombo->currentIndex();
+        ui->fromCombo->setCurrentIndex(ui->toCombo->currentIndex());
+        ui->toCombo->setCurrentIndex(previousFrom);
+        ui->inputEdit->setFocus();
+    });
+    connect(ui->clearButton, &QPushButton::clicked, this, [this] {
+        ui->inputEdit->clear();
+        clearResult();
+        ui->inputEdit->setFocus();
+    });
+    connect(ui->copyButton, &QPushButton::clicked, this, [this] {
+        QApplication::clipboard()->setText(ui->resultEdit->text());
+        ui->statusLabel->setText(tr("结果已复制。"));
+    });
+    changeCategory();
+    ui->inputEdit->setText(QStringLiteral("25"));
+}
+
+MainWindow::~MainWindow() { delete ui; }
+
+void MainWindow::changeCategory()
+{
+    const auto category = ui->categoryCombo->currentIndex() == 0
+        ? Conversion::Category::Temperature : Conversion::Category::Length;
+    const QStringList names = Conversion::units(category);
+    ui->fromCombo->clear();
+    ui->toCombo->clear();
+    ui->fromCombo->addItems(names);
+    ui->toCombo->addItems(names);
+    ui->fromCombo->setCurrentIndex(category == Conversion::Category::Length ? 2 : 0);
+    ui->toCombo->setCurrentIndex(1);
+    clearResult();
+}
+
+void MainWindow::clearResult()
+{
+    ui->resultEdit->clear();
+    ui->formulaLabel->setText(tr("选择单位并输入数值，点击“换算”查看计算过程。"));
+    ui->statusLabel->clear();
+    ui->copyButton->setEnabled(false);
+}
+
+void MainWindow::convertValue()
+{
+    const auto category = ui->categoryCombo->currentIndex() == 0
+        ? Conversion::Category::Temperature : Conversion::Category::Length;
+    const auto result = Conversion::convert(ui->inputEdit->text(), category,
+                                            ui->fromCombo->currentIndex(),
+                                            ui->toCombo->currentIndex());
+    if (!result.ok) {
+        clearResult();
+        ui->statusLabel->setText(result.error);
+        ui->inputEdit->setFocus();
+        return;
+    }
+    ui->resultEdit->setText(QStringLiteral("%1 %2")
+        .arg(result.value, 0, 'g', 12).arg(ui->toCombo->currentText()));
+    ui->formulaLabel->setText(result.explanation);
+    ui->statusLabel->setText(tr("换算完成。结果最多显示 12 位有效数字。"));
+    ui->copyButton->setEnabled(true);
+}
+
diff --git a/Projects/01_UnitConverter/mainwindow.h b/Projects/01_UnitConverter/mainwindow.h
new file mode 100644
index 0000000..1e60bff
--- /dev/null
+++ b/Projects/01_UnitConverter/mainwindow.h
@@ -0,0 +1,16 @@
+#pragma once
+#include <QMainWindow>
+namespace Ui { class MainWindow; }
+
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow() override;
+private:
+    Ui::MainWindow *ui;
+    void changeCategory();
+    void clearResult();
+    void convertValue();
+};
+
diff --git a/Projects/01_UnitConverter/mainwindow.ui b/Projects/01_UnitConverter/mainwindow.ui
new file mode 100644
index 0000000..f78940c
--- /dev/null
+++ b/Projects/01_UnitConverter/mainwindow.ui
@@ -0,0 +1,246 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="windowTitle">
+   <string>单位换算器</string>
+  </property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>840</width>
+    <height>650</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="rootLayout">
+    <property name="spacing">
+     <number>12</number>
+    </property>
+    <property name="leftMargin">
+     <number>24</number>
+    </property>
+    <property name="topMargin">
+     <number>24</number>
+    </property>
+    <property name="rightMargin">
+     <number>24</number>
+    </property>
+    <property name="bottomMargin">
+     <number>24</number>
+    </property>
+    <item>
+     <widget class="QLabel" name="titleLabel">
+      <property name="text">
+       <string>单位换算器</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="subtitleLabel">
+      <property name="text">
+       <string>输入一个数值，查看换算结果和计算过程。</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QGroupBox" name="inputGroup">
+      <property name="title">
+       <string>输入与单位</string>
+      </property>
+     <layout class="QGridLayout" name="inputLayout" columnstretch="1,1">
+       <property name="spacing">
+        <number>12</number>
+       </property>
+       <item row="0" column="0">
+        <widget class="QLabel" name="categoryLabel">
+         <property name="text">
+          <string>换算类型</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <widget class="QLabel" name="inputLabel">
+         <property name="text">
+          <string>输入数值</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="0">
+        <widget class="QComboBox" name="categoryCombo" />
+       </item>
+       <item row="1" column="1">
+        <widget class="QLineEdit" name="inputEdit">
+         <property name="placeholderText">
+          <string>例如 25、-10.5 或 1e3</string>
+         </property>
+         <property name="maxLength">
+          <number>100</number>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="fromLabel">
+         <property name="text">
+          <string>源单位</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="1">
+        <widget class="QLabel" name="toLabel">
+         <property name="text">
+          <string>目标单位</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="3" column="0">
+        <widget class="QComboBox" name="fromCombo" />
+       </item>
+       <item row="3" column="1">
+        <widget class="QComboBox" name="toCombo" />
+       </item>
+      </layout>
+     </widget>
+    </item>
+    <item>
+     <layout class="QHBoxLayout" name="actionLayout">
+      <property name="spacing">
+       <number>12</number>
+      </property>
+      <item>
+       <widget class="QPushButton" name="convertButton">
+        <property name="text">
+         <string>换算</string>
+        </property>
+        <property name="default">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="swapButton">
+        <property name="text">
+         <string>交换单位</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="clearButton">
+        <property name="text">
+         <string>清空输入</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <widget class="QGroupBox" name="resultGroup">
+      <property name="title">
+       <string>换算结果</string>
+      </property>
+      <layout class="QVBoxLayout" name="resultLayout">
+       <property name="spacing">
+        <number>12</number>
+       </property>
+       <item>
+        <widget class="QLineEdit" name="resultEdit">
+         <property name="readOnly">
+          <bool>true</bool>
+         </property>
+         <property name="placeholderText">
+          <string>结果将在这里显示</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QLabel" name="formulaLabel">
+         <property name="text">
+          <string />
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+         <property name="wordWrap">
+          <bool>true</bool>
+         </property>
+         <property name="minimumSize">
+          <size>
+           <width>0</width>
+           <height>70</height>
+          </size>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPushButton" name="copyButton">
+         <property name="text">
+          <string>复制结果</string>
+         </property>
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="statusLabel">
+      <property name="text">
+       <string />
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+      <property name="minimumSize">
+       <size>
+        <width>0</width>
+        <height>55</height>
+       </size>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="helpLabel">
+      <property name="text">
+       <string>长度须为非负数，温度须不低于绝对零度。修改输入或单位后，需要重新换算。</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <resources />
+ <connections />
+</ui>
diff --git a/Projects/01_UnitConverter/tests/test_UnitConverter.cpp b/Projects/01_UnitConverter/tests/test_UnitConverter.cpp
new file mode 100644
index 0000000..88a160e
--- /dev/null
+++ b/Projects/01_UnitConverter/tests/test_UnitConverter.cpp
@@ -0,0 +1,90 @@
+#include <QtTest>
+#include <QComboBox>
+#include <QLineEdit>
+#include <QLabel>
+#include <QPushButton>
+#include "conversion.h"
+#include "mainwindow.h"
+#include <QApplication>
+#include <QDir>
+#include "appearance.h"
+
+static void savePreview(QWidget &window, const QString &fileName)
+{
+    const QString folder = QString::fromLocal8Bit(qgetenv("QT_TEACHING_SCREENSHOTS"));
+    if (folder.isEmpty()) return;
+    QDir().mkpath(folder);
+    window.show();
+    QApplication::processEvents();
+    QVERIFY(window.grab().save(QDir(folder).filePath(fileName)));
+}
+
+class ConverterTest : public QObject {
+    Q_OBJECT
+private slots:
+    void initTestCase() { applyAppearance(*qApp); }
+    void knownValues_data()
+    {
+        QTest::addColumn<int>("category");
+        QTest::addColumn<QString>("input");
+        QTest::addColumn<int>("from");
+        QTest::addColumn<int>("to");
+        QTest::addColumn<double>("expected");
+        QTest::newRow("freezing") << 0 << QStringLiteral("0") << 0 << 1 << 32.0;
+        QTest::newRow("boiling") << 0 << QStringLiteral("212") << 1 << 0 << 100.0;
+        QTest::newRow("minus40") << 0 << QStringLiteral("-40") << 0 << 1 << -40.0;
+        QTest::newRow("kelvin") << 0 << QStringLiteral("273.15") << 2 << 0 << 0.0;
+        QTest::newRow("absolute-zero-C") << 0 << QStringLiteral("-273.15") << 0 << 2 << 0.0;
+        QTest::newRow("absolute-zero-F") << 0 << QStringLiteral("-459.67") << 1 << 2 << 0.0;
+        QTest::newRow("meter-cm") << 1 << QStringLiteral("1") << 2 << 1 << 100.0;
+        QTest::newRow("inch-cm") << 1 << QStringLiteral("1") << 4 << 1 << 2.54;
+        QTest::newRow("foot-meter") << 1 << QStringLiteral("1") << 5 << 2 << 0.3048;
+        QTest::newRow("km-mm") << 1 << QStringLiteral("1") << 3 << 0 << 1000000.0;
+        QTest::newRow("scientific") << 1 << QStringLiteral(" 1e3 ") << 0 << 2 << 1.0;
+        QTest::newRow("same-unit") << 1 << QStringLiteral("12.25") << 2 << 2 << 12.25;
+    }
+    void knownValues()
+    {
+        QFETCH(int, category); QFETCH(QString, input);
+        QFETCH(int, from); QFETCH(int, to); QFETCH(double, expected);
+        auto result = Conversion::convert(input, static_cast<Conversion::Category>(category), from, to);
+        QVERIFY2(result.ok, qPrintable(result.error));
+        QVERIFY(qAbs(result.value - expected) <= 1e-9 * qMax(1.0, qAbs(expected)));
+    }
+    void rejectsInvalid()
+    {
+        for (const QString &text : {QString(), QStringLiteral("12abc"), QStringLiteral("nan"),
+             QStringLiteral("inf"), QStringLiteral("1,000"), QStringLiteral("1e309")})
+            QVERIFY(!Conversion::convert(text, Conversion::Category::Length, 2, 1).ok);
+        QVERIFY(!Conversion::convert(QStringLiteral("-1"), Conversion::Category::Length, 2, 1).ok);
+        QVERIFY(!Conversion::convert(QStringLiteral("-274"), Conversion::Category::Temperature, 0, 2).ok);
+        QVERIFY(!Conversion::convert(QStringLiteral("-0.1"), Conversion::Category::Temperature, 2, 0).ok);
+        QVERIFY(!Conversion::convert(QStringLiteral("1e308"), Conversion::Category::Length, 3, 0).ok);
+    }
+    void uiWorkflow()
+    {
+        MainWindow w; w.show();
+        auto *input = w.findChild<QLineEdit *>(QStringLiteral("inputEdit"));
+        auto *result = w.findChild<QLineEdit *>(QStringLiteral("resultEdit"));
+        auto *convert = w.findChild<QPushButton *>(QStringLiteral("convertButton"));
+        input->setText(QStringLiteral("25"));
+        QTest::mouseClick(convert, Qt::LeftButton);
+        QVERIFY(result->text().startsWith(QStringLiteral("77 ")));
+        savePreview(w, QStringLiteral("01_converter.png"));
+        input->setText(QStringLiteral("bad"));
+        QVERIFY(result->text().isEmpty());
+        QTest::mouseClick(convert, Qt::LeftButton);
+        QVERIFY(!w.findChild<QLabel *>(QStringLiteral("statusLabel"))->text().isEmpty());
+        QVERIFY(!w.findChild<QPushButton *>(QStringLiteral("copyButton"))->isEnabled());
+        w.findChild<QComboBox *>(QStringLiteral("categoryCombo"))->setCurrentIndex(1);
+        input->setText(QStringLiteral("1"));
+        QTest::mouseClick(convert, Qt::LeftButton);
+        QVERIFY(result->text().startsWith(QStringLiteral("100 ")));
+        QTest::mouseClick(w.findChild<QPushButton *>(QStringLiteral("swapButton")), Qt::LeftButton);
+        QTest::mouseClick(convert, Qt::LeftButton);
+        QVERIFY(result->text().startsWith(QStringLiteral("0.01 ")));
+    }
+};
+QTEST_MAIN(ConverterTest)
+#include "test_UnitConverter.moc"
+
diff --git a/Projects/01_UnitConverter/tests/test_UnitConverter.pro b/Projects/01_UnitConverter/tests/test_UnitConverter.pro
new file mode 100644
index 0000000..a2ade73
--- /dev/null
+++ b/Projects/01_UnitConverter/tests/test_UnitConverter.pro
@@ -0,0 +1,11 @@
+QT += widgets testlib
+CONFIG += c++14 console testcase
+greaterThan(QT_MAJOR_VERSION, 5): CONFIG += c++17
+TEMPLATE = app
+TARGET = test_UnitConverter
+INCLUDEPATH += ..
+SOURCES += test_UnitConverter.cpp ../mainwindow.cpp ../conversion.cpp
+HEADERS += ../mainwindow.h ../conversion.h
+FORMS += ../mainwindow.ui
+msvc: QMAKE_CXXFLAGS += /utf-8
+
diff --git a/Projects/02_ClassroomTimer/CMakeLists.txt b/Projects/02_ClassroomTimer/CMakeLists.txt
new file mode 100644
index 0000000..0105831
--- /dev/null
+++ b/Projects/02_ClassroomTimer/CMakeLists.txt
@@ -0,0 +1,33 @@
+cmake_minimum_required(VERSION 3.16)
+project(ClassroomTimer VERSION 1.0 LANGUAGES CXX)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
+find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)
+if(QT_VERSION_MAJOR EQUAL 5 AND Qt5Core_VERSION VERSION_LESS 5.14.2)
+    message(FATAL_ERROR "Qt 5.14.2 or newer is required.")
+endif()
+if(QT_VERSION_MAJOR EQUAL 6)
+    set(CMAKE_CXX_STANDARD 17)
+endif()
+if(MSVC)
+    add_compile_options(/utf-8)
+else()
+    add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+add_executable(ClassroomTimer WIN32 main.cpp appearance.h mainwindow.cpp mainwindow.h countdown.cpp countdown.h mainwindow.ui)
+target_link_libraries(ClassroomTimer PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
+option(BUILD_TEACHING_TESTS "Build teaching project tests" OFF)
+if(BUILD_TEACHING_TESTS)
+    enable_testing()
+    find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Test)
+    add_executable(test_ClassroomTimer tests/test_ClassroomTimer.cpp mainwindow.cpp mainwindow.h
+                   countdown.cpp countdown.h mainwindow.ui)
+    target_include_directories(test_ClassroomTimer PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+    target_link_libraries(test_ClassroomTimer PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Test)
+    add_test(NAME ClassroomTimer COMMAND test_ClassroomTimer -platform offscreen)
+endif()
+
diff --git a/Projects/02_ClassroomTimer/ClassroomTimer.pro b/Projects/02_ClassroomTimer/ClassroomTimer.pro
new file mode 100644
index 0000000..7b67929
--- /dev/null
+++ b/Projects/02_ClassroomTimer/ClassroomTimer.pro
@@ -0,0 +1,10 @@
+QT += widgets
+CONFIG += c++14
+greaterThan(QT_MAJOR_VERSION, 5): CONFIG += c++17
+TEMPLATE = app
+TARGET = ClassroomTimer
+SOURCES += main.cpp mainwindow.cpp countdown.cpp
+HEADERS += mainwindow.h countdown.h
+FORMS += mainwindow.ui
+msvc: QMAKE_CXXFLAGS += /utf-8
+
diff --git a/Projects/02_ClassroomTimer/README.md b/Projects/02_ClassroomTimer/README.md
new file mode 100644
index 0000000..9a4af2b
--- /dev/null
+++ b/Projects/02_ClassroomTimer/README.md
@@ -0,0 +1,65 @@
+# 项目二：课堂计时器
+
+适合第3—4章讲解信号槽、定时器、状态变化和数值输入。可用于限时练习、分组讨论与课堂展示。
+
+## 功能与操作
+
+时长范围为 0 到 23:59:59，但零时长不能开始。默认时长为 5 分钟。
+
+- 开始：从设置的时长开始计时。
+- 暂停：保存此刻的剩余时间。
+- 继续：从保存的剩余时间接着计时。
+- 复位：停止本轮计时，并恢复到设置的完整时长。
+- 重新开始：到时后开始新的一轮。
+- 全屏显示：便于投影；按 Esc 退出全屏。
+- 到时提示：显示“时间到”，并可播放一次系统提示音。能否听到提示音取决于系统声音设置。
+
+运行中和暂停时，时长输入框均被锁定；先复位，再修改时长。
+
+## 课堂任务
+
+先连接开始按钮和 QTimer，让学生观察 timeout 信号重复到达。随后故意安排一次较慢的界面处理，讨论“每次 timeout 减 100 毫秒”为什么可能不准确。
+
+QTimer 在这个项目中每隔约 100 毫秒请求刷新显示。实际剩余时间由 QElapsedTimer 提供的经过时间计算，不依赖刷新次数。即使某次刷新较晚，下一次仍按实际经过的时间计算。
+
+讲解模型时可先使用确定的数值：总时长 10 秒，在第 2.5 秒暂停，还剩 7.5 秒；暂停 1 分钟后继续，剩余时间仍从 7.5 秒开始。
+
+## 核心数据
+
+Countdown 保存四项信息：完整时长、当前计时片段开始时的剩余量、该片段的开始时刻，以及状态。
+
+运行时：
+剩余毫秒 = max(0, 片段开始时的剩余毫秒 − 本片段已过去的毫秒)。
+
+暂停时先算出剩余毫秒并保存，再切换到 Paused。继续时只记录新的片段开始时刻，不恢复完整时长。
+
+界面显示秒数采用向上取整。还剩 1 毫秒时显示 1 秒，真正到时才显示 0，避免“已经显示零但还没结束”的现象。
+
+## 状态与操作
+
+| 当前状态 | 开始按钮 | 暂停按钮 | 时长输入 |
+|---|---|---|---|
+| Ready | 开始，零时长除外 | 不可用 | 可修改 |
+| Running | 不可用 | 暂停 | 锁定 |
+| Paused | 继续 | 不可用 | 锁定 |
+| Finished | 重新开始 | 不可用 | 可修改 |
+
+refreshDisplay 根据同一个状态统一设置按钮，避免在多个槽函数中分别修改后产生矛盾。
+
+## 学生练习
+
+1. 加入 1、3、5 分钟快捷设置按钮，并遵守运行中不能改变时长的规则。
+2. 最后 10 秒改变数字颜色，到时和复位后恢复正确颜色。
+3. 增加本轮标题，例如“独立练习”。标题变化不应重新开始计时。
+
+## 验收用例
+
+- 设置 1 秒并开始：到时显示 00:00:00，暂停按钮不可用。
+- 运行时连续触发开始操作：不会重新计算起点。
+- 暂停后等待：剩余时间保持不变；继续后接着减少。
+- 运行或暂停时点击复位：回到原设置时长，并允许修改。
+- 设置零时长：不能开始。
+- 模型两次更新之间跨过截止时间：剩余量直接归零，不出现负数。
+
+自动化测试通过传入固定的毫秒数检查计时规则；另有真实按钮测试确认计时模型与界面的连接。
+
diff --git a/Projects/02_ClassroomTimer/appearance.h b/Projects/02_ClassroomTimer/appearance.h
new file mode 100644
index 0000000..16d3436
--- /dev/null
+++ b/Projects/02_ClassroomTimer/appearance.h
@@ -0,0 +1,34 @@
+#pragma once
+#include <QApplication>
+#include <QFont>
+#include <QStyleFactory>
+
+inline void applyAppearance(QApplication &app)
+{
+    app.setStyle(QStyleFactory::create(QStringLiteral("Fusion")));
+    app.setFont(QFont(QStringLiteral("Microsoft YaHei UI"), 11));
+    app.setStyleSheet(QStringLiteral(
+        "QMainWindow { background: #f5f7fb; }"
+        "QLabel { color: #23364c; }"
+        "QLabel#titleLabel { font-size: 27px; font-weight: bold; color: #173b63; }"
+        "QLabel#subtitleLabel, QLabel#helpLabel { color: #52657a; }"
+        "QGroupBox { background: white; border: 1px solid #d6e0eb;"
+        " border-radius: 8px; margin-top: 12px; padding: 18px 12px 12px; }"
+        "QGroupBox::title { subcontrol-origin: margin; left: 12px; padding: 0 6px; }"
+        "QLineEdit, QSpinBox, QComboBox { min-height: 32px; padding: 3px 8px; }"
+        "QLineEdit, QSpinBox, QComboBox, QPlainTextEdit, QListWidget"
+        " { background: white; color: #23364c; }"
+        "QPushButton { min-height: 34px; padding: 4px 14px; }"
+        "QPushButton#convertButton, QPushButton#startButton, QPushButton#drawButton,"
+        " QPushButton#applyButton, QPushButton#groupsButton { background: #255c93;"
+        " color: white; border: 1px solid #255c93; border-radius: 5px; }"
+        "QPushButton:disabled, QPushButton#convertButton:disabled,"
+        " QPushButton#startButton:disabled, QPushButton#drawButton:disabled,"
+        " QPushButton#applyButton:disabled, QPushButton#groupsButton:disabled"
+        " { color: #8995a3; background: #e6ebf1; border-color: #d6e0eb; }"
+        "QLabel#statusLabel { color: #185376; }"
+        "QLineEdit#resultEdit { font-size: 23px; min-height: 45px; color: #175e53; }"
+        "QLabel#timeLabel { font: bold 76px 'Consolas'; color: #173b63; }"
+        "QProgressBar { border: 1px solid #d6e0eb; border-radius: 6px; height: 14px; }"
+        "QProgressBar::chunk { background: #2b8a7d; border-radius: 5px; }"));
+}
diff --git a/Projects/02_ClassroomTimer/countdown.cpp b/Projects/02_ClassroomTimer/countdown.cpp
new file mode 100644
index 0000000..f54c323
--- /dev/null
+++ b/Projects/02_ClassroomTimer/countdown.cpp
@@ -0,0 +1,61 @@
+#include "countdown.h"
+
+Countdown::Countdown(qint64 durationMs)
+    : m_duration(qMax<qint64>(0, durationMs)), m_remainingAtStart(m_duration)
+{
+}
+
+bool Countdown::setDuration(qint64 durationMs)
+{
+    if (m_state == State::Running || m_state == State::Paused || durationMs < 0)
+        return false;
+    m_duration = durationMs;
+    reset();
+    return true;
+}
+
+void Countdown::start(qint64 nowMs)
+{
+    if (m_state == State::Running || m_duration <= 0)
+        return;
+    if (m_state != State::Paused)
+        m_remainingAtStart = m_duration;
+    m_segmentStarted = nowMs;
+    m_state = State::Running;
+}
+
+qint64 Countdown::remaining(qint64 nowMs) const
+{
+    if (m_state == State::Finished)
+        return 0;
+    if (m_state != State::Running)
+        return m_remainingAtStart;
+    const qint64 elapsed = qMax<qint64>(0, nowMs - m_segmentStarted);
+    return qMax<qint64>(0, m_remainingAtStart - elapsed);
+}
+
+void Countdown::update(qint64 nowMs)
+{
+    if (m_state == State::Running && remaining(nowMs) == 0) {
+        m_remainingAtStart = 0;
+        m_state = State::Finished;
+    }
+}
+
+void Countdown::pause(qint64 nowMs)
+{
+    update(nowMs);
+    if (m_state != State::Running)
+        return;
+    // 先保存这一刻的剩余时间，再切换状态，暂停期间不继续扣减。
+    m_remainingAtStart = remaining(nowMs);
+    m_state = State::Paused;
+}
+
+void Countdown::reset()
+{
+    m_remainingAtStart = m_duration;
+    m_segmentStarted = 0;
+    m_state = State::Ready;
+}
+
diff --git a/Projects/02_ClassroomTimer/countdown.h b/Projects/02_ClassroomTimer/countdown.h
new file mode 100644
index 0000000..4a89d7c
--- /dev/null
+++ b/Projects/02_ClassroomTimer/countdown.h
@@ -0,0 +1,23 @@
+#pragma once
+#include <QtGlobal>
+
+// 界面负责取得当前时间，模型只负责计算；测试可传入确定的毫秒数。
+class Countdown {
+public:
+    enum class State { Ready, Running, Paused, Finished };
+    explicit Countdown(qint64 durationMs = 300000);
+    bool setDuration(qint64 durationMs);
+    void start(qint64 nowMs);
+    void pause(qint64 nowMs);
+    void reset();
+    void update(qint64 nowMs);
+    qint64 remaining(qint64 nowMs) const;
+    qint64 duration() const { return m_duration; }
+    State state() const { return m_state; }
+private:
+    qint64 m_duration;
+    qint64 m_remainingAtStart;
+    qint64 m_segmentStarted = 0;
+    State m_state = State::Ready;
+};
+
diff --git a/Projects/02_ClassroomTimer/main.cpp b/Projects/02_ClassroomTimer/main.cpp
new file mode 100644
index 0000000..d8f1ee0
--- /dev/null
+++ b/Projects/02_ClassroomTimer/main.cpp
@@ -0,0 +1,19 @@
+#include "mainwindow.h"
+#include "appearance.h"
+#include <QApplication>
+#include <QFont>
+#include <QStyleFactory>
+
+int main(int argc, char *argv[])
+{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
+    QApplication app(argc, argv);
+    applyAppearance(app);
+    MainWindow window;
+    window.show();
+    return app.exec();
+}
+
diff --git a/Projects/02_ClassroomTimer/mainwindow.cpp b/Projects/02_ClassroomTimer/mainwindow.cpp
new file mode 100644
index 0000000..42db7d2
--- /dev/null
+++ b/Projects/02_ClassroomTimer/mainwindow.cpp
@@ -0,0 +1,91 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+#include <QApplication>
+#include <QShortcut>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+    m_clock.start();
+    m_refreshTimer.setInterval(100);
+    connect(&m_refreshTimer, &QTimer::timeout, this, &MainWindow::refreshDisplay);
+    for (QSpinBox *spin : {ui->hoursSpin, ui->minutesSpin, ui->secondsSpin})
+        connect(spin, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
+                this, &MainWindow::durationChanged);
+    connect(ui->startButton, &QPushButton::clicked, this, [this] {
+        m_countdown.start(m_clock.elapsed());
+        refreshDisplay();
+    });
+    connect(ui->pauseButton, &QPushButton::clicked, this, [this] {
+        const auto previousState = m_countdown.state();
+        m_countdown.pause(m_clock.elapsed());
+        if (previousState == Countdown::State::Running
+                && m_countdown.state() == Countdown::State::Finished
+                && ui->soundCheck->isChecked())
+            QApplication::beep();
+        refreshDisplay();
+    });
+    connect(ui->resetButton, &QPushButton::clicked, this, [this] {
+        m_countdown.reset();
+        refreshDisplay();
+    });
+    connect(ui->fullscreenButton, &QPushButton::clicked, this, [this] {
+        if (isFullScreen()) showNormal(); else showFullScreen();
+        ui->fullscreenButton->setText(isFullScreen() ? tr("退出全屏") : tr("全屏显示"));
+    });
+    auto *escape = new QShortcut(QKeySequence(Qt::Key_Escape), this);
+    connect(escape, &QShortcut::activated, this, [this] {
+        if (isFullScreen()) {
+            showNormal();
+            ui->fullscreenButton->setText(tr("全屏显示"));
+        }
+    });
+    durationChanged();
+}
+
+MainWindow::~MainWindow() { delete ui; }
+
+void MainWindow::durationChanged()
+{
+    const qint64 seconds = ui->hoursSpin->value() * 3600
+        + ui->minutesSpin->value() * 60 + ui->secondsSpin->value();
+    m_countdown.setDuration(seconds * 1000);
+    refreshDisplay();
+}
+
+void MainWindow::refreshDisplay()
+{
+    const qint64 now = m_clock.elapsed();
+    const auto previousState = m_countdown.state();
+    m_countdown.update(now);
+    const auto state = m_countdown.state();
+    const bool running = state == Countdown::State::Running;
+    const bool paused = state == Countdown::State::Paused;
+    if (running && !m_refreshTimer.isActive()) m_refreshTimer.start();
+    if (!running) m_refreshTimer.stop();
+    const qint64 remaining = m_countdown.remaining(now);
+    // 向上取整：还剩 1 毫秒时显示 1 秒，真正到时才显示零。
+    const qint64 seconds = (remaining + 999) / 1000;
+    ui->timeLabel->setText(QStringLiteral("%1:%2:%3")
+        .arg(seconds / 3600, 2, 10, QLatin1Char('0'))
+        .arg((seconds / 60) % 60, 2, 10, QLatin1Char('0'))
+        .arg(seconds % 60, 2, 10, QLatin1Char('0')));
+    ui->progressBar->setValue(m_countdown.duration() == 0 ? 0
+        : static_cast<int>(remaining * 1000 / m_countdown.duration()));
+    ui->durationGroup->setEnabled(!running && !paused);
+    ui->startButton->setEnabled(!running && m_countdown.duration() > 0);
+    ui->pauseButton->setEnabled(running);
+    ui->startButton->setText(paused ? tr("继续") :
+        state == Countdown::State::Finished ? tr("重新开始") : tr("开始"));
+    if (running) ui->statusLabel->setText(tr("正在计时"));
+    else if (paused) ui->statusLabel->setText(tr("已暂停 · 点击“继续”接着计时"));
+    else if (state == Countdown::State::Finished)
+        ui->statusLabel->setText(tr("时间到！本轮计时已结束。"));
+    else ui->statusLabel->setText(m_countdown.duration() > 0
+        ? tr("准备就绪 · 点击“开始”") : tr("请先设置大于 0 的时长。"));
+    if (previousState == Countdown::State::Running && state == Countdown::State::Finished
+            && ui->soundCheck->isChecked())
+        QApplication::beep();
+}
+
diff --git a/Projects/02_ClassroomTimer/mainwindow.h b/Projects/02_ClassroomTimer/mainwindow.h
new file mode 100644
index 0000000..82704b4
--- /dev/null
+++ b/Projects/02_ClassroomTimer/mainwindow.h
@@ -0,0 +1,21 @@
+#pragma once
+#include <QMainWindow>
+#include <QElapsedTimer>
+#include <QTimer>
+#include "countdown.h"
+namespace Ui { class MainWindow; }
+
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow() override;
+private:
+    Ui::MainWindow *ui;
+    Countdown m_countdown;
+    QElapsedTimer m_clock;
+    QTimer m_refreshTimer;
+    void durationChanged();
+    void refreshDisplay();
+};
+
diff --git a/Projects/02_ClassroomTimer/mainwindow.ui b/Projects/02_ClassroomTimer/mainwindow.ui
new file mode 100644
index 0000000..7252cd0
--- /dev/null
+++ b/Projects/02_ClassroomTimer/mainwindow.ui
@@ -0,0 +1,242 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="windowTitle">
+   <string>课堂计时器</string>
+  </property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>820</width>
+    <height>650</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="rootLayout">
+    <property name="spacing">
+     <number>12</number>
+    </property>
+    <property name="leftMargin">
+     <number>24</number>
+    </property>
+    <property name="topMargin">
+     <number>24</number>
+    </property>
+    <property name="rightMargin">
+     <number>24</number>
+    </property>
+    <property name="bottomMargin">
+     <number>24</number>
+    </property>
+    <item>
+     <widget class="QLabel" name="titleLabel">
+      <property name="text">
+       <string>课堂计时器</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="subtitleLabel">
+      <property name="text">
+       <string>用于课堂练习、分组讨论与限时展示。</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QGroupBox" name="durationGroup">
+      <property name="title">
+       <string>设置时长</string>
+      </property>
+      <layout class="QGridLayout" name="durationLayout">
+       <property name="spacing">
+        <number>12</number>
+       </property>
+       <item row="0" column="0">
+        <widget class="QLabel" name="hoursSpinLabel">
+         <property name="text">
+          <string>小时</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="0">
+        <widget class="QSpinBox" name="hoursSpin">
+         <property name="maximum">
+          <number>23</number>
+         </property>
+         <property name="value">
+          <number>0</number>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <widget class="QLabel" name="minutesSpinLabel">
+         <property name="text">
+          <string>分钟</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="1">
+        <widget class="QSpinBox" name="minutesSpin">
+         <property name="maximum">
+          <number>59</number>
+         </property>
+         <property name="value">
+          <number>5</number>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="2">
+        <widget class="QLabel" name="secondsSpinLabel">
+         <property name="text">
+          <string>秒</string>
+         </property>
+         <property name="textFormat">
+          <enum>Qt::PlainText</enum>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="2">
+        <widget class="QSpinBox" name="secondsSpin">
+         <property name="maximum">
+          <number>59</number>
+         </property>
+         <property name="value">
+          <number>0</number>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="timeLabel">
+      <property name="text">
+       <string>00:05:00</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignCenter</set>
+      </property>
+      <property name="minimumSize">
+       <size>
+        <width>0</width>
+        <height>135</height>
+       </size>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QProgressBar" name="progressBar">
+      <property name="maximum">
+       <number>1000</number>
+      </property>
+      <property name="value">
+       <number>1000</number>
+      </property>
+      <property name="textVisible">
+       <bool>false</bool>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="statusLabel">
+      <property name="text">
+       <string>准备就绪</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="alignment">
+       <set>Qt::AlignCenter</set>
+      </property>
+      <property name="minimumSize">
+       <size>
+        <width>0</width>
+        <height>45</height>
+       </size>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <layout class="QHBoxLayout" name="timerActions">
+      <property name="spacing">
+       <number>12</number>
+      </property>
+      <item>
+       <widget class="QPushButton" name="startButton">
+        <property name="text">
+         <string>开始</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="pauseButton">
+        <property name="text">
+         <string>暂停</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="resetButton">
+        <property name="text">
+         <string>复位</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="fullscreenButton">
+        <property name="text">
+         <string>全屏显示</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <widget class="QCheckBox" name="soundCheck">
+      <property name="text">
+       <string>到时播放系统提示音</string>
+      </property>
+      <property name="checked">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="helpLabel">
+      <property name="text">
+       <string>计时中和暂停时锁定时长；点击“复位”后可重新设置。全屏时按 Esc 返回。</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <resources />
+ <connections />
+</ui>
\ No newline at end of file
diff --git a/Projects/02_ClassroomTimer/tests/test_ClassroomTimer.cpp b/Projects/02_ClassroomTimer/tests/test_ClassroomTimer.cpp
new file mode 100644
index 0000000..dbafc8f
--- /dev/null
+++ b/Projects/02_ClassroomTimer/tests/test_ClassroomTimer.cpp
@@ -0,0 +1,100 @@
+#include <QtTest>
+#include <QSpinBox>
+#include <QPushButton>
+#include <QLabel>
+#include <QCheckBox>
+#include "countdown.h"
+#include "mainwindow.h"
+#include <QApplication>
+#include <QDir>
+#include "appearance.h"
+
+static void savePreview(QWidget &window, const QString &fileName)
+{
+    const QString folder = QString::fromLocal8Bit(qgetenv("QT_TEACHING_SCREENSHOTS"));
+    if (folder.isEmpty()) return;
+    QDir().mkpath(folder);
+    window.show();
+    QApplication::processEvents();
+    QVERIFY(window.grab().save(QDir(folder).filePath(fileName)));
+}
+
+class TimerTest : public QObject {
+    Q_OBJECT
+private slots:
+    void initTestCase() { applyAppearance(*qApp); }
+    void pauseResumeAndDrift()
+    {
+        Countdown model(10000);
+        model.start(100);
+        model.start(500); // 重复开始不能重新计时。
+        QCOMPARE(model.remaining(2600), qint64(7500));
+        model.pause(2600);
+        QCOMPARE(model.remaining(90000), qint64(7500));
+        QVERIFY(!model.setDuration(2000));
+        model.start(100000);
+        QCOMPARE(model.remaining(102500), qint64(5000));
+        model.update(107500);
+        QVERIFY(model.state() == Countdown::State::Finished);
+        QCOMPARE(model.remaining(107500), qint64(0));
+        model.start(200000);
+        QCOMPARE(model.remaining(200000), qint64(10000));
+    }
+    void delayedRefreshAndReset()
+    {
+        Countdown model(5000);
+        model.start(0);
+        model.update(100);
+        model.update(4300);
+        QCOMPARE(model.remaining(4300), qint64(700));
+        model.update(9999);
+        QCOMPARE(model.remaining(9999), qint64(0));
+        QVERIFY(model.state() == Countdown::State::Finished);
+        model.reset();
+        QVERIFY(model.state() == Countdown::State::Ready);
+        QCOMPARE(model.remaining(9999), qint64(5000));
+    }
+    void zeroAndDeadlinePause()
+    {
+        Countdown model(0);
+        model.start(0);
+        QVERIFY(model.state() == Countdown::State::Ready);
+        QVERIFY(!model.setDuration(-1));
+        QVERIFY(model.setDuration(1000));
+        model.start(10);
+        model.pause(1010);
+        QVERIFY(model.state() == Countdown::State::Finished);
+    }
+    void uiWorkflow()
+    {
+        MainWindow w; w.show();
+        auto *start = w.findChild<QPushButton *>(QStringLiteral("startButton"));
+        auto *pause = w.findChild<QPushButton *>(QStringLiteral("pauseButton"));
+        auto *reset = w.findChild<QPushButton *>(QStringLiteral("resetButton"));
+        auto *minutes = w.findChild<QSpinBox *>(QStringLiteral("minutesSpin"));
+        auto *seconds = w.findChild<QSpinBox *>(QStringLiteral("secondsSpin"));
+        auto *time = w.findChild<QLabel *>(QStringLiteral("timeLabel"));
+        w.findChild<QCheckBox *>(QStringLiteral("soundCheck"))->setChecked(false);
+        savePreview(w, QStringLiteral("02_timer.png"));
+        minutes->setValue(0); seconds->setValue(1);
+        QTest::mouseClick(start, Qt::LeftButton);
+        QVERIFY(!minutes->isEnabled());
+        QTest::mouseClick(pause, Qt::LeftButton);
+        QCOMPARE(start->text(), QStringLiteral("继续"));
+        const QString pausedText = time->text();
+        QTest::qWait(150);
+        QCOMPARE(time->text(), pausedText);
+        QTest::mouseClick(start, Qt::LeftButton);
+        QTRY_COMPARE(time->text(), QStringLiteral("00:00:00"));
+        QVERIFY(w.findChild<QLabel *>(QStringLiteral("statusLabel"))->text().contains(QStringLiteral("时间到")));
+        QVERIFY(!pause->isEnabled());
+        QTest::mouseClick(reset, Qt::LeftButton);
+        QCOMPARE(time->text(), QStringLiteral("00:00:01"));
+        QVERIFY(minutes->isEnabled());
+        seconds->setValue(0);
+        QVERIFY(!start->isEnabled());
+    }
+};
+QTEST_MAIN(TimerTest)
+#include "test_ClassroomTimer.moc"
+
diff --git a/Projects/02_ClassroomTimer/tests/test_ClassroomTimer.pro b/Projects/02_ClassroomTimer/tests/test_ClassroomTimer.pro
new file mode 100644
index 0000000..8be0777
--- /dev/null
+++ b/Projects/02_ClassroomTimer/tests/test_ClassroomTimer.pro
@@ -0,0 +1,11 @@
+QT += widgets testlib
+CONFIG += c++14 console testcase
+greaterThan(QT_MAJOR_VERSION, 5): CONFIG += c++17
+TEMPLATE = app
+TARGET = test_ClassroomTimer
+INCLUDEPATH += ..
+SOURCES += test_ClassroomTimer.cpp ../mainwindow.cpp ../countdown.cpp
+HEADERS += ../mainwindow.h ../countdown.h
+FORMS += ../mainwindow.ui
+msvc: QMAKE_CXXFLAGS += /utf-8
+
diff --git a/Projects/03_RaffleGroups/CMakeLists.txt b/Projects/03_RaffleGroups/CMakeLists.txt
new file mode 100644
index 0000000..b6fa90e
--- /dev/null
+++ b/Projects/03_RaffleGroups/CMakeLists.txt
@@ -0,0 +1,33 @@
+cmake_minimum_required(VERSION 3.16)
+project(RaffleGroups VERSION 1.0 LANGUAGES CXX)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
+find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)
+if(QT_VERSION_MAJOR EQUAL 5 AND Qt5Core_VERSION VERSION_LESS 5.14.2)
+    message(FATAL_ERROR "Qt 5.14.2 or newer is required.")
+endif()
+if(QT_VERSION_MAJOR EQUAL 6)
+    set(CMAKE_CXX_STANDARD 17)
+endif()
+if(MSVC)
+    add_compile_options(/utf-8)
+else()
+    add_compile_options(-Wall -Wextra -Wpedantic)
+endif()
+add_executable(RaffleGroups WIN32 main.cpp appearance.h mainwindow.cpp mainwindow.h roster.cpp roster.h mainwindow.ui)
+target_link_libraries(RaffleGroups PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
+option(BUILD_TEACHING_TESTS "Build teaching project tests" OFF)
+if(BUILD_TEACHING_TESTS)
+    enable_testing()
+    find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Test)
+    add_executable(test_RaffleGroups tests/test_RaffleGroups.cpp mainwindow.cpp mainwindow.h
+                   roster.cpp roster.h mainwindow.ui)
+    target_include_directories(test_RaffleGroups PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+    target_link_libraries(test_RaffleGroups PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Test)
+    add_test(NAME RaffleGroups COMMAND test_RaffleGroups -platform offscreen)
+endif()
+
diff --git a/Projects/03_RaffleGroups/README.md b/Projects/03_RaffleGroups/README.md
new file mode 100644
index 0000000..5e937ca
--- /dev/null
+++ b/Projects/03_RaffleGroups/README.md
@@ -0,0 +1,65 @@
+# 项目三：随机抽签与分组工具
+
+适合第3—4章讲解 QStringList、QSet、随机数、下拉框和按钮状态。
+
+## 名单的含义
+
+每行代表一位学生。行首和行尾空白会被去掉，空行会被忽略。相同条目不允许重复；同名学生可以写成“01 张三”和“02 张三”。程序不根据姓名猜测是否为同一个人。
+
+打开程序时填入一份虚构的 12 人示例名单，但还没有应用。检查后点击“应用名单”，才能抽签和分组。每次应用都会开始新一轮并清空旧结果。修改名单后，操作按钮暂时禁用，避免操作的实际名单与编辑框不一致。
+
+名单上限为 5000 人，每条最多 100 个字符。这个限制用于及时发现错误粘贴，普通班级无需调整。
+
+## 不重复抽签
+
+选择本次人数后点击“抽取”。程序保存两份列表：完整名单和剩余候选池。抽到一位学生后，立即从候选池中移除，后续抽签只能从剩余的人中选择。
+
+本轮全部抽完后，抽取按钮不可用。点击“重置抽签”会重新填满候选池并清除抽签记录；已生成的分组保持不变。
+
+课堂上可以先用 A、B、C 三人演示：抽出 B 后候选池只剩 A、C。让学生解释为什么不能每次都从完整名单随机选择。
+
+## 随机分组
+
+分组始终使用全部已应用名单，与抽签结果无关。
+
+有两种参数：
+
+- 每组最多人数：先用向上取整计算需要几组，再平均分配。
+- 分成几组：直接指定组数，组数不能超过人数。
+
+例如 12 人、每组最多 5 人，需要 3 组。为了平衡人数，结果是每组 4 人。这个参数表示人数上限，不要求先装满一组再分下一组。
+
+程序先用 Fisher–Yates 算法打乱名单，再按组号轮流分配。每人恰好出现一次，各组人数最多相差 1。再次点击“生成分组”会重新分组，结果不保证与上次不同。
+
+## 课堂任务
+
+第一步只读名单，使用 QStringList 保存，显示有效人数。再加入空行过滤和重复检查，观察同名但学号不同的两条记录应怎样处理。
+
+第二步实现抽签：先抽一人，再抽多人。让学生跟踪 takeAt 执行前后候选池的大小。
+
+第三步实现分组。先按原顺序轮流分组，确认没有遗漏，再加入洗牌。把“随机顺序”和“完整分配”分开验证，便于找错。
+
+第四步处理界面状态：名单编辑后禁用操作，应用成功后启用，名单重复时保留错误原因。
+
+## 学生练习
+
+1. 增加“复制本轮抽签记录”按钮。
+2. 保存分组结果到文本文件，作为第8章的延伸任务。
+3. 增加“撤销上一次抽签”，明确如何把人员放回候选池，以及怎样修改历史记录。
+
+## 验收用例
+
+| 输入或操作 | 预期 |
+|---|---|
+| 空名单 | 显示提示，不允许开始 |
+| A 与前后带空格的 A | 判断重复并指出行号 |
+| 01 张三、02 张三 | 作为两位学生接受 |
+| 4 人分两次各抽 2 人 | 四人各出现一次，随后不能继续抽 |
+| 12 人，每组最多 5 人 | 3 组，每组 4 人 |
+| 10 人，分成 3 组 | 人数为 4、3、3，顺序可变 |
+| 3 人，要求分成 4 组 | 显示组数过多的提示 |
+| 先抽签，再分组 | 分组仍包含全部名单 |
+| 已生成结果后编辑名单 | 旧结果清空，重新应用前不能操作 |
+
+自动化测试用固定种子得到可重复的随机序列，并对 1—100 人的两种分组方式检查总人数、唯一性和组间人数差。界面使用全局随机生成器，正常抽签不使用固定种子。
+
diff --git a/Projects/03_RaffleGroups/RaffleGroups.pro b/Projects/03_RaffleGroups/RaffleGroups.pro
new file mode 100644
index 0000000..82ca915
--- /dev/null
+++ b/Projects/03_RaffleGroups/RaffleGroups.pro
@@ -0,0 +1,10 @@
+QT += widgets
+CONFIG += c++14
+greaterThan(QT_MAJOR_VERSION, 5): CONFIG += c++17
+TEMPLATE = app
+TARGET = RaffleGroups
+SOURCES += main.cpp mainwindow.cpp roster.cpp
+HEADERS += mainwindow.h roster.h
+FORMS += mainwindow.ui
+msvc: QMAKE_CXXFLAGS += /utf-8
+
diff --git a/Projects/03_RaffleGroups/appearance.h b/Projects/03_RaffleGroups/appearance.h
new file mode 100644
index 0000000..16d3436
--- /dev/null
+++ b/Projects/03_RaffleGroups/appearance.h
@@ -0,0 +1,34 @@
+#pragma once
+#include <QApplication>
+#include <QFont>
+#include <QStyleFactory>
+
+inline void applyAppearance(QApplication &app)
+{
+    app.setStyle(QStyleFactory::create(QStringLiteral("Fusion")));
+    app.setFont(QFont(QStringLiteral("Microsoft YaHei UI"), 11));
+    app.setStyleSheet(QStringLiteral(
+        "QMainWindow { background: #f5f7fb; }"
+        "QLabel { color: #23364c; }"
+        "QLabel#titleLabel { font-size: 27px; font-weight: bold; color: #173b63; }"
+        "QLabel#subtitleLabel, QLabel#helpLabel { color: #52657a; }"
+        "QGroupBox { background: white; border: 1px solid #d6e0eb;"
+        " border-radius: 8px; margin-top: 12px; padding: 18px 12px 12px; }"
+        "QGroupBox::title { subcontrol-origin: margin; left: 12px; padding: 0 6px; }"
+        "QLineEdit, QSpinBox, QComboBox { min-height: 32px; padding: 3px 8px; }"
+        "QLineEdit, QSpinBox, QComboBox, QPlainTextEdit, QListWidget"
+        " { background: white; color: #23364c; }"
+        "QPushButton { min-height: 34px; padding: 4px 14px; }"
+        "QPushButton#convertButton, QPushButton#startButton, QPushButton#drawButton,"
+        " QPushButton#applyButton, QPushButton#groupsButton { background: #255c93;"
+        " color: white; border: 1px solid #255c93; border-radius: 5px; }"
+        "QPushButton:disabled, QPushButton#convertButton:disabled,"
+        " QPushButton#startButton:disabled, QPushButton#drawButton:disabled,"
+        " QPushButton#applyButton:disabled, QPushButton#groupsButton:disabled"
+        " { color: #8995a3; background: #e6ebf1; border-color: #d6e0eb; }"
+        "QLabel#statusLabel { color: #185376; }"
+        "QLineEdit#resultEdit { font-size: 23px; min-height: 45px; color: #175e53; }"
+        "QLabel#timeLabel { font: bold 76px 'Consolas'; color: #173b63; }"
+        "QProgressBar { border: 1px solid #d6e0eb; border-radius: 6px; height: 14px; }"
+        "QProgressBar::chunk { background: #2b8a7d; border-radius: 5px; }"));
+}
diff --git a/Projects/03_RaffleGroups/main.cpp b/Projects/03_RaffleGroups/main.cpp
new file mode 100644
index 0000000..d8f1ee0
--- /dev/null
+++ b/Projects/03_RaffleGroups/main.cpp
@@ -0,0 +1,19 @@
+#include "mainwindow.h"
+#include "appearance.h"
+#include <QApplication>
+#include <QFont>
+#include <QStyleFactory>
+
+int main(int argc, char *argv[])
+{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
+    QApplication app(argc, argv);
+    applyAppearance(app);
+    MainWindow window;
+    window.show();
+    return app.exec();
+}
+
diff --git a/Projects/03_RaffleGroups/mainwindow.cpp b/Projects/03_RaffleGroups/mainwindow.cpp
new file mode 100644
index 0000000..3a16f72
--- /dev/null
+++ b/Projects/03_RaffleGroups/mainwindow.cpp
@@ -0,0 +1,121 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+#include <QApplication>
+#include <QClipboard>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+    ui->groupModeCombo->addItems({tr("每组最多人数"), tr("分成几组")});
+    connect(ui->namesEdit, &QPlainTextEdit::textChanged, this, &MainWindow::markDirty);
+    connect(ui->applyButton, &QPushButton::clicked, this, &MainWindow::applyNames);
+    connect(ui->sampleButton, &QPushButton::clicked, this, [this] {
+        ui->namesEdit->setPlainText(QStringLiteral(
+            "01 陈晨\n02 林悦\n03 王宁\n04 李然\n05 周航\n06 赵晴\n"
+            "07 孙瑞\n08 吴桐\n09 郑宇\n10 许诺\n11 何欣\n12 方舟"));
+    });
+    connect(ui->drawButton, &QPushButton::clicked, this, &MainWindow::drawNames);
+    connect(ui->groupsButton, &QPushButton::clicked, this, &MainWindow::makeGroups);
+    connect(ui->resetButton, &QPushButton::clicked, this, [this] {
+        m_session.resetDraw();
+        m_round = 0;
+        ui->historyList->clear();
+        ui->chosenEdit->clear();
+        ui->statusLabel->setText(tr("抽签已重置，所有人重新进入候选池。"));
+        refreshControls();
+    });
+    connect(ui->copyGroupsButton, &QPushButton::clicked, this, [this] {
+        QApplication::clipboard()->setText(ui->groupsEdit->toPlainText());
+        ui->statusLabel->setText(tr("分组结果已复制。"));
+    });
+    connect(ui->groupModeCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
+            this, [this] { ui->groupsEdit->clear(); ui->copyGroupsButton->setEnabled(false); });
+    connect(ui->groupValueSpin, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
+            this, [this] { ui->groupsEdit->clear(); ui->copyGroupsButton->setEnabled(false); });
+    ui->sampleButton->click();
+}
+
+MainWindow::~MainWindow() { delete ui; }
+
+void MainWindow::markDirty()
+{
+    m_dirty = true;
+    // 名单有改动时清除旧展示，避免把旧名单的结果当成新名单的结果。
+    ui->chosenEdit->clear();
+    ui->historyList->clear();
+    ui->groupsEdit->clear();
+    ui->copyGroupsButton->setEnabled(false);
+    ui->statusLabel->setText(tr("名单尚未应用。检查后点击“应用名单”开始新一轮。"));
+    refreshControls();
+}
+
+void MainWindow::applyNames()
+{
+    const auto parsed = Roster::parse(ui->namesEdit->toPlainText());
+    if (!parsed.ok()) {
+        ui->statusLabel->setText(parsed.error);
+        return;
+    }
+    m_session.setNames(parsed.names);
+    m_dirty = false;
+    m_round = 0;
+    ui->historyList->clear();
+    ui->chosenEdit->clear();
+    ui->groupsEdit->clear();
+    ui->copyGroupsButton->setEnabled(false);
+    ui->statusLabel->setText(tr("已应用 %1 人。抽签与分组现在使用这份名单。").arg(parsed.names.size()));
+    refreshControls();
+}
+
+void MainWindow::refreshControls()
+{
+    const int remaining = m_session.remainingCount();
+    ui->drawButton->setEnabled(!m_dirty && remaining > 0);
+    ui->resetButton->setEnabled(!m_dirty);
+    ui->groupsButton->setEnabled(!m_dirty && !m_session.names().isEmpty());
+    ui->drawCountSpin->setEnabled(!m_dirty && remaining > 0);
+    ui->drawCountSpin->setMaximum(qMax(1, remaining));
+    ui->countLabel->setText(m_dirty ? tr("名单待应用")
+        : tr("名单 %1 人  ·  尚未抽到 %2 人").arg(m_session.names().size()).arg(remaining));
+}
+
+void MainWindow::drawNames()
+{
+    if (m_dirty) return;
+    const QStringList selected = m_session.draw(ui->drawCountSpin->value(),
+                                                 *QRandomGenerator::global());
+    if (selected.isEmpty()) return;
+    ++m_round;
+    ui->chosenEdit->setPlainText(selected.join(QStringLiteral("\n")));
+    ui->historyList->addItem(tr("第 %1 次：%2").arg(m_round).arg(selected.join(QStringLiteral("、"))));
+    ui->historyList->scrollToBottom();
+    ui->statusLabel->setText(m_session.remainingCount() == 0
+        ? tr("所有人都已抽到。点击“重置抽签”可以开始下一轮。")
+        : tr("本次抽取 %1 人，已从候选池中移除。").arg(selected.size()));
+    refreshControls();
+}
+
+void MainWindow::makeGroups()
+{
+    if (m_dirty) return;
+    const auto groups = m_session.groups(ui->groupValueSpin->value(),
+        ui->groupModeCombo->currentIndex() == 1, *QRandomGenerator::global());
+    if (groups.isEmpty()) {
+        ui->groupsEdit->clear();
+        ui->copyGroupsButton->setEnabled(false);
+        ui->statusLabel->setText(tr("组数不能超过名单人数，请调整后再分组。"));
+        return;
+    }
+    QStringList lines;
+    for (int i = 0; i < groups.size(); ++i) {
+        lines.append(tr("第 %1 组（%2 人）").arg(i + 1).arg(groups.at(i).size()));
+        lines.append(groups.at(i).join(QStringLiteral("、")));
+        lines.append(QString());
+    }
+    ui->groupsEdit->setPlainText(lines.join(QStringLiteral("\n")));
+    ui->copyGroupsButton->setEnabled(true);
+    ui->statusLabel->setText(tr("已将全部 %1 人分为 %2 组，每人出现一次，各组人数最多相差 1。")
+                            .arg(m_session.names().size()).arg(groups.size()));
+}
+
diff --git a/Projects/03_RaffleGroups/mainwindow.h b/Projects/03_RaffleGroups/mainwindow.h
new file mode 100644
index 0000000..16f8fd9
--- /dev/null
+++ b/Projects/03_RaffleGroups/mainwindow.h
@@ -0,0 +1,22 @@
+#pragma once
+#include <QMainWindow>
+#include "roster.h"
+namespace Ui { class MainWindow; }
+
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow() override;
+private:
+    Ui::MainWindow *ui;
+    Roster::Session m_session;
+    bool m_dirty = true;
+    int m_round = 0;
+    void markDirty();
+    void applyNames();
+    void refreshControls();
+    void drawNames();
+    void makeGroups();
+};
+
diff --git a/Projects/03_RaffleGroups/mainwindow.ui b/Projects/03_RaffleGroups/mainwindow.ui
new file mode 100644
index 0000000..fcb8f6e
--- /dev/null
+++ b/Projects/03_RaffleGroups/mainwindow.ui
@@ -0,0 +1,329 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="windowTitle">
+   <string>随机抽签与分组工具</string>
+  </property>
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1120</width>
+    <height>780</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="rootLayout">
+    <property name="spacing">
+     <number>12</number>
+    </property>
+    <property name="leftMargin">
+     <number>24</number>
+    </property>
+    <property name="topMargin">
+     <number>24</number>
+    </property>
+    <property name="rightMargin">
+     <number>24</number>
+    </property>
+    <property name="bottomMargin">
+     <number>24</number>
+    </property>
+    <item>
+     <widget class="QLabel" name="titleLabel">
+      <property name="text">
+       <string>随机抽签与分组</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="subtitleLabel">
+      <property name="text">
+       <string>先应用名单，再抽签或分组。同名学生请使用“学号 姓名”区分。</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLabel" name="countLabel">
+      <property name="text">
+       <string>名单待应用</string>
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <layout class="QHBoxLayout" name="bodyLayout">
+      <property name="spacing">
+       <number>12</number>
+      </property>
+      <item>
+       <widget class="QGroupBox" name="namesGroup">
+        <property name="title">
+         <string>班级名单</string>
+        </property>
+        <property name="minimumSize">
+         <size>
+          <width>310</width>
+          <height>0</height>
+         </size>
+        </property>
+        <layout class="QVBoxLayout" name="namesLayout">
+         <property name="spacing">
+          <number>12</number>
+         </property>
+         <item>
+          <widget class="QLabel" name="namesHelp">
+           <property name="text">
+            <string>每行一人，空行会被忽略。修改名单后需重新应用。</string>
+           </property>
+           <property name="textFormat">
+            <enum>Qt::PlainText</enum>
+           </property>
+           <property name="wordWrap">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPlainTextEdit" name="namesEdit">
+           <property name="placeholderText">
+            <string>01 张三
+02 李四</string>
+           </property>
+           <property name="minimumSize">
+            <size>
+             <width>250</width>
+             <height>320</height>
+            </size>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="applyButton">
+           <property name="text">
+            <string>应用名单（开始新一轮）</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="sampleButton">
+           <property name="text">
+            <string>填入示例名单</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="QTabWidget" name="resultTabs">
+        <property name="minimumSize">
+         <size>
+          <width>570</width>
+          <height>0</height>
+         </size>
+        </property>
+        <widget class="QWidget" name="drawTab">
+         <attribute name="title">
+          <string>不重复抽签</string>
+         </attribute>
+         <layout class="QVBoxLayout" name="drawLayout">
+          <property name="spacing">
+           <number>12</number>
+          </property>
+          <item>
+           <layout class="QHBoxLayout" name="drawControls">
+            <property name="spacing">
+             <number>12</number>
+            </property>
+            <item>
+             <widget class="QLabel" name="drawCountLabel">
+              <property name="text">
+               <string>本次抽取人数</string>
+              </property>
+              <property name="textFormat">
+               <enum>Qt::PlainText</enum>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QSpinBox" name="drawCountSpin">
+              <property name="minimum">
+               <number>1</number>
+              </property>
+              <property name="maximum">
+               <number>5000</number>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <widget class="QPushButton" name="drawButton">
+              <property name="text">
+               <string>抽取</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <widget class="QLabel" name="chosenLabel">
+            <property name="text">
+             <string>本次抽取</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::PlainText</enum>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPlainTextEdit" name="chosenEdit">
+            <property name="readOnly">
+             <bool>true</bool>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>0</width>
+              <height>100</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>16777215</width>
+              <height>145</height>
+             </size>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="historyLabel">
+            <property name="text">
+             <string>本轮抽签记录</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::PlainText</enum>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QListWidget" name="historyList" />
+          </item>
+          <item>
+           <widget class="QPushButton" name="resetButton">
+            <property name="text">
+             <string>重置抽签</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+        <widget class="QWidget" name="groupTab">
+         <attribute name="title">
+          <string>随机分组</string>
+         </attribute>
+         <layout class="QVBoxLayout" name="groupLayout">
+          <property name="spacing">
+           <number>12</number>
+          </property>
+          <item>
+           <widget class="QLabel" name="groupHelp">
+            <property name="text">
+             <string>分组使用全部已应用名单，与已抽到哪些人无关。每次点击都会重新分组。</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::PlainText</enum>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <layout class="QHBoxLayout" name="groupControls">
+            <property name="spacing">
+             <number>12</number>
+            </property>
+            <item>
+             <widget class="QComboBox" name="groupModeCombo" />
+            </item>
+            <item>
+             <widget class="QSpinBox" name="groupValueSpin">
+              <property name="minimum">
+               <number>1</number>
+              </property>
+              <property name="maximum">
+               <number>5000</number>
+              </property>
+              <property name="value">
+               <number>4</number>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <widget class="QPushButton" name="groupsButton">
+            <property name="text">
+             <string>生成分组</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPlainTextEdit" name="groupsEdit">
+            <property name="readOnly">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="copyGroupsButton">
+            <property name="text">
+             <string>复制分组结果</string>
+            </property>
+            <property name="enabled">
+             <bool>false</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <widget class="QLabel" name="statusLabel">
+      <property name="text">
+       <string />
+      </property>
+      <property name="textFormat">
+       <enum>Qt::PlainText</enum>
+      </property>
+      <property name="wordWrap">
+       <bool>true</bool>
+      </property>
+      <property name="minimumSize">
+       <size>
+        <width>0</width>
+        <height>55</height>
+       </size>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <resources />
+ <connections />
+</ui>
\ No newline at end of file
diff --git a/Projects/03_RaffleGroups/roster.cpp b/Projects/03_RaffleGroups/roster.cpp
new file mode 100644
index 0000000..71ad6c4
--- /dev/null
+++ b/Projects/03_RaffleGroups/roster.cpp
@@ -0,0 +1,72 @@
+#include "roster.h"
+#include <QSet>
+
+namespace Roster {
+ParsedNames parse(const QString &text)
+{
+    ParsedNames result;
+    QSet<QString> seen;
+    const QStringList lines = text.split(QLatin1Char('\n'));
+    int lineNumber = 0;
+    for (const QString &line : lines) {
+        ++lineNumber;
+        const QString name = line.trimmed();
+        if (name.isEmpty()) continue;
+        if (seen.contains(name)) {
+            result.error = QStringLiteral("第 %1 行与前面的条目重复：%2。"
+                "同名学生请加上学号后再应用名单。").arg(lineNumber).arg(name);
+            return result;
+        }
+        if (name.size() > 100) {
+            result.error = QStringLiteral("第 %1 行超过 100 个字符，请检查是否粘贴了整段文字。")
+                               .arg(lineNumber);
+            return result;
+        }
+        seen.insert(name);
+        result.names.append(name);
+    }
+    if (result.names.isEmpty())
+        result.error = QStringLiteral("名单为空，请每行输入一位学生。");
+    else if (result.names.size() > 5000)
+        result.error = QStringLiteral("名单超过 5000 人，请分批操作。");
+    return result;
+}
+
+void Session::setNames(const QStringList &names)
+{
+    m_names = names;
+    resetDraw();
+}
+
+void Session::resetDraw() { m_pool = m_names; }
+
+QStringList Session::draw(int count, QRandomGenerator &random)
+{
+    QStringList selected;
+    if (count <= 0 || count > m_pool.size()) return selected;
+    for (int i = 0; i < count; ++i) {
+        const int index = random.bounded(static_cast<int>(m_pool.size()));
+        // 从候选池中移除已抽到的人，本轮后续抽签就不会重复。
+        selected.append(m_pool.takeAt(index));
+    }
+    return selected;
+}
+
+QList<QStringList> Session::groups(int value, bool valueIsGroupCount,
+                                   QRandomGenerator &random) const
+{
+    QList<QStringList> result;
+    const int n = static_cast<int>(m_names.size());
+    if (n == 0 || value <= 0 || (valueIsGroupCount && value > n)) return result;
+    const int count = valueIsGroupCount ? value : (n + value - 1) / value;
+    QStringList shuffled = m_names;
+    // Fisher–Yates 洗牌。每次从尚未固定的位置中均匀选取一个。
+    for (int i = n - 1; i > 0; --i)
+        qSwap(shuffled[i], shuffled[random.bounded(i + 1)]);
+    for (int i = 0; i < count; ++i) result.append(QStringList());
+    // 轮流放入各组，保证每人出现一次，各组人数最多相差 1。
+    for (int i = 0; i < n; ++i) result[i % count].append(shuffled.at(i));
+    return result;
+}
+}
+
diff --git a/Projects/03_RaffleGroups/roster.h b/Projects/03_RaffleGroups/roster.h
new file mode 100644
index 0000000..da30278
--- /dev/null
+++ b/Projects/03_RaffleGroups/roster.h
@@ -0,0 +1,28 @@
+#pragma once
+#include <QStringList>
+#include <QList>
+#include <QRandomGenerator>
+
+namespace Roster {
+struct ParsedNames {
+    QStringList names;
+    QString error;
+    bool ok() const { return error.isEmpty(); }
+};
+ParsedNames parse(const QString &text);
+
+class Session {
+public:
+    void setNames(const QStringList &names);
+    void resetDraw();
+    const QStringList &names() const { return m_names; }
+    int remainingCount() const { return static_cast<int>(m_pool.size()); }
+    QStringList draw(int count, QRandomGenerator &random);
+    QList<QStringList> groups(int value, bool valueIsGroupCount,
+                             QRandomGenerator &random) const;
+private:
+    QStringList m_names;
+    QStringList m_pool;
+};
+}
+
diff --git a/Projects/03_RaffleGroups/sample_roster.txt b/Projects/03_RaffleGroups/sample_roster.txt
new file mode 100644
index 0000000..67d19a7
--- /dev/null
+++ b/Projects/03_RaffleGroups/sample_roster.txt
@@ -0,0 +1,13 @@
+01 陈晨
+02 林悦
+03 王宁
+04 李然
+05 周航
+06 赵晴
+07 孙瑞
+08 吴桐
+09 郑宇
+10 许诺
+11 何欣
+12 方舟
+
diff --git a/Projects/03_RaffleGroups/tests/test_RaffleGroups.cpp b/Projects/03_RaffleGroups/tests/test_RaffleGroups.cpp
new file mode 100644
index 0000000..f3cb805
--- /dev/null
+++ b/Projects/03_RaffleGroups/tests/test_RaffleGroups.cpp
@@ -0,0 +1,119 @@
+#include <QtTest>
+#include <QPlainTextEdit>
+#include <QPushButton>
+#include <QSpinBox>
+#include <QTabWidget>
+#include <QLabel>
+#include <QSet>
+#include "roster.h"
+#include "mainwindow.h"
+#include <QApplication>
+#include <QDir>
+#include "appearance.h"
+
+static void savePreview(QWidget &window, const QString &fileName)
+{
+    const QString folder = QString::fromLocal8Bit(qgetenv("QT_TEACHING_SCREENSHOTS"));
+    if (folder.isEmpty()) return;
+    QDir().mkpath(folder);
+    window.show();
+    QApplication::processEvents();
+    QVERIFY(window.grab().save(QDir(folder).filePath(fileName)));
+}
+
+class RaffleTest : public QObject {
+    Q_OBJECT
+private slots:
+    void initTestCase() { applyAppearance(*qApp); }
+    void parsing()
+    {
+        auto parsed = Roster::parse(QStringLiteral(" 01 张三 \r\n\n02 李四\r\n"));
+        QVERIFY(parsed.ok()); QCOMPARE(parsed.names.size(), 2);
+        QCOMPARE(parsed.names.first(), QStringLiteral("01 张三"));
+        QVERIFY(!Roster::parse(QStringLiteral("张三\n 张三 ")).ok());
+        QVERIFY(!Roster::parse(QStringLiteral(" \n ")).ok());
+        QVERIFY(Roster::parse(QStringLiteral("01 张三\n02 张三")).ok());
+        QVERIFY(!Roster::parse(QString(101, QLatin1Char('x'))).ok());
+    }
+    void drawingWithoutReplacement()
+    {
+        Roster::Session session;
+        const QStringList names = {QStringLiteral("A"), QStringLiteral("B"),
+                                   QStringLiteral("C"), QStringLiteral("D")};
+        session.setNames(names);
+        QRandomGenerator random(12345);
+        QVERIFY(session.draw(5, random).isEmpty());
+        QCOMPARE(session.remainingCount(), 4);
+        QStringList drawn = session.draw(2, random);
+        drawn.append(session.draw(2, random));
+        QSet<QString> unique;
+        for (const QString &name : drawn) unique.insert(name);
+        QCOMPARE(unique.size(), 4);
+        QCOMPARE(session.remainingCount(), 0);
+        QVERIFY(session.draw(1, random).isEmpty());
+        session.resetDraw();
+        QCOMPARE(session.remainingCount(), 4);
+    }
+    void groupingInvariants()
+    {
+        QRandomGenerator random(54321);
+        for (int n = 1; n <= 100; ++n) {
+            QStringList names;
+            for (int i = 0; i < n; ++i) names.append(QString::number(i));
+            Roster::Session session; session.setNames(names);
+            session.draw(1, random); // 分组仍使用全部名单。
+            for (bool byCount : {false, true}) {
+                const int value = byCount ? qMin(n, 7) : 7;
+                const auto groups = session.groups(value, byCount, random);
+                QCOMPARE(groups.size(), byCount ? value : (n + value - 1) / value);
+                QSet<QString> all; int total = 0, smallest = n, largest = 0;
+                for (const QStringList &group : groups) {
+                    QVERIFY(!group.isEmpty());
+                    smallest = qMin(smallest, static_cast<int>(group.size()));
+                    largest = qMax(largest, static_cast<int>(group.size()));
+                    total += static_cast<int>(group.size());
+                    for (const QString &name : group) all.insert(name);
+                }
+                QCOMPARE(total, n); QCOMPARE(all.size(), n);
+                QVERIFY(largest - smallest <= 1);
+                if (!byCount) QVERIFY(largest <= value);
+            }
+            QVERIFY(session.groups(n + 1, true, random).isEmpty());
+        }
+    }
+    void uiWorkflow()
+    {
+        MainWindow w; w.show();
+        auto *names = w.findChild<QPlainTextEdit *>(QStringLiteral("namesEdit"));
+        auto *apply = w.findChild<QPushButton *>(QStringLiteral("applyButton"));
+        auto *draw = w.findChild<QPushButton *>(QStringLiteral("drawButton"));
+        auto *chosen = w.findChild<QPlainTextEdit *>(QStringLiteral("chosenEdit"));
+        QVERIFY(!draw->isEnabled());
+        QTest::mouseClick(apply, Qt::LeftButton);
+        QVERIFY(draw->isEnabled());
+        QTest::mouseClick(draw, Qt::LeftButton);
+        QVERIFY(!chosen->toPlainText().isEmpty());
+        savePreview(w, QStringLiteral("03_raffle.png"));
+        w.findChild<QTabWidget *>(QStringLiteral("resultTabs"))->setCurrentIndex(1);
+        QTest::mouseClick(w.findChild<QPushButton *>(QStringLiteral("groupsButton")), Qt::LeftButton);
+        auto *groups = w.findChild<QPlainTextEdit *>(QStringLiteral("groupsEdit"));
+        QVERIFY(groups->toPlainText().contains(QStringLiteral("第 3 组")));
+        savePreview(w, QStringLiteral("03_groups.png"));
+        names->setPlainText(QStringLiteral("A\nA"));
+        QVERIFY(!draw->isEnabled());
+        QVERIFY(groups->toPlainText().isEmpty());
+        QTest::mouseClick(apply, Qt::LeftButton);
+        QVERIFY(w.findChild<QLabel *>(QStringLiteral("statusLabel"))->text().contains(QStringLiteral("重复")));
+        names->setPlainText(QStringLiteral("A\nB"));
+        QTest::mouseClick(apply, Qt::LeftButton);
+        w.findChild<QTabWidget *>(QStringLiteral("resultTabs"))->setCurrentIndex(0);
+        w.findChild<QSpinBox *>(QStringLiteral("drawCountSpin"))->setValue(2);
+        QTest::mouseClick(draw, Qt::LeftButton);
+        QVERIFY(!draw->isEnabled());
+        QTest::mouseClick(w.findChild<QPushButton *>(QStringLiteral("resetButton")), Qt::LeftButton);
+        QVERIFY(draw->isEnabled());
+    }
+};
+QTEST_MAIN(RaffleTest)
+#include "test_RaffleGroups.moc"
+
diff --git a/Projects/03_RaffleGroups/tests/test_RaffleGroups.pro b/Projects/03_RaffleGroups/tests/test_RaffleGroups.pro
new file mode 100644
index 0000000..5eb13fe
--- /dev/null
+++ b/Projects/03_RaffleGroups/tests/test_RaffleGroups.pro
@@ -0,0 +1,11 @@
+QT += widgets testlib
+CONFIG += c++14 console testcase
+greaterThan(QT_MAJOR_VERSION, 5): CONFIG += c++17
+TEMPLATE = app
+TARGET = test_RaffleGroups
+INCLUDEPATH += ..
+SOURCES += test_RaffleGroups.cpp ../mainwindow.cpp ../roster.cpp
+HEADERS += ../mainwindow.h ../roster.h
+FORMS += ../mainwindow.ui
+msvc: QMAKE_CXXFLAGS += /utf-8
+
diff --git a/Projects/CMakeLists.txt b/Projects/CMakeLists.txt
new file mode 100644
index 0000000..d61d2ba
--- /dev/null
+++ b/Projects/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.16)
+project(QtTeachingProjects LANGUAGES CXX)
+option(BUILD_TEACHING_TESTS "Build all regression tests" OFF)
+if(BUILD_TEACHING_TESTS)
+    enable_testing()
+endif()
+add_subdirectory(01_UnitConverter)
+add_subdirectory(02_ClassroomTimer)
+add_subdirectory(03_RaffleGroups)
+
diff --git a/Projects/QtTeachingProjects.pro b/Projects/QtTeachingProjects.pro
new file mode 100644
index 0000000..877a3f8
--- /dev/null
+++ b/Projects/QtTeachingProjects.pro
@@ -0,0 +1,6 @@
+TEMPLATE = subdirs
+SUBDIRS = converter timer raffle
+converter.file = 01_UnitConverter/UnitConverter.pro
+timer.file = 02_ClassroomTimer/ClassroomTimer.pro
+raffle.file = 03_RaffleGroups/RaffleGroups.pro
+
diff --git a/Projects/README.md b/Projects/README.md
new file mode 100644
index 0000000..c7e811a
--- /dev/null
+++ b/Projects/README.md
@@ -0,0 +1,74 @@
+# Qt Widgets 前期教学项目
+
+三个独立的 C++ 桌面项目，对应单位换算、课堂计时、随机抽签与分组。全部使用 Qt Widgets，界面文件为 Qt Designer 的 `.ui`，没有 QML、Qt Quick 或网页界面。
+
+## 项目入口
+
+| 项目 | Qt Creator 入口 | 教学说明 |
+|---|---|---|
+| 单位换算器 | `01_UnitConverter/UnitConverter.pro` | `01_UnitConverter/README.md` |
+| 课堂计时器 | `02_ClassroomTimer/ClassroomTimer.pro` | `02_ClassroomTimer/README.md` |
+| 随机抽签与分组 | `03_RaffleGroups/RaffleGroups.pro` | `03_RaffleGroups/README.md` |
+
+每个项目也有独立的 `CMakeLists.txt`。根目录的 `QtTeachingProjects.pro` 和 `CMakeLists.txt` 可以一次打开三个项目。目录使用英文，便于旧版 Windows 构建工具处理路径；界面、注释和教学说明使用中文。
+
+## 先运行，再阅读源码
+
+`Run_Qt5.14.2` 中的三个 EXE 是 Windows 64 位演示程序，附带运行库，可直接双击。转交其他电脑时请复制整个目录。
+
+- `UnitConverter.exe`：单位换算器。
+- `ClassroomTimer.exe`：课堂计时器。
+- `RaffleGroups.exe`：随机抽签与分组。
+
+## 用 Qt Creator 打开
+
+1. 选择“文件 → 打开文件或项目”，打开上述任意一个 `.pro`。
+2. 选择桌面 Kit。本机已经配置的 `Desktop Qt 6.8.3 MinGW 64-bit` 可以使用。
+3. 构建并运行。构建目录建议使用英文路径，并与源码目录分开。
+4. 双击 `mainwindow.ui` 可进入 Designer，修改布局和组件属性。
+5. 换用 Qt 5.14.2 时，选择对应的 Qt 5.14.2 桌面 Kit，并使用新的构建目录。Qt 库与编译器必须属于匹配的 Kit，不能混用 MinGW 与 MSVC。
+
+源码以 Qt 5.14.2 为最低版本。Qt 5 构建使用 C++14；Qt 6 构建自动使用 C++17。没有使用 Qt 6 专有的控件接口，也没有要求 Qt 5.15 的无版本 CMake 目标。
+
+## 怎样阅读
+
+每个项目都按下面的顺序阅读：
+
+1. `mainwindow.ui`：先认清组件名称与布局。
+2. `main.cpp`：创建应用、应用外观、显示主窗口、进入事件循环。
+3. `mainwindow.cpp`：找出信号连接，再追踪一次按钮操作。
+4. `conversion.cpp` / `countdown.cpp` / `roster.cpp`：阅读不依赖具体控件的计算规则。
+5. `tests`：查看正常输入和边界情况应得到什么结果。
+
+`appearance.h` 只负责字体与样式，可以在学生掌握功能后再讲。业务逻辑没有依赖这些样式。当前交付的是可运行的完整参考工程，学生练习见各项目 README。
+
+## CMake 构建
+
+以 Qt 5.14.2 的 MinGW Kit 为例，先将匹配的编译器、Qt 的 bin 和 Ninja 加入当前终端 PATH，再运行：
+
+```powershell
+cmake -S . -B build-qt5 -G Ninja -DCMAKE_PREFIX_PATH="D:/Qt/5.14.2/mingw73_64" -DCMAKE_BUILD_TYPE=Release
+cmake --build build-qt5
+```
+
+示例中的 Qt 路径需要替换成实际安装位置。本机 Qt 6 的前缀为 `D:/Qt/6.8.3/mingw_64`，编译器位于 `D:/Qt/Tools/mingw1310_64/bin`。旧版本 Qt Creator 可直接使用 qmake 工程，不必额外配置 CMake。
+
+## 自动化验证
+
+测试需要同一套 Qt 中的 Qt Test 模块。普通构建默认不编译测试：
+
+```powershell
+cmake -S . -B build-test -G Ninja -DCMAKE_PREFIX_PATH="你的Qt目录" -DBUILD_TEACHING_TESTS=ON -DCMAKE_BUILD_TYPE=Release
+cmake --build build-test
+ctest --test-dir build-test --output-on-failure
+```
+
+也可打开各项目 `tests` 中的 `.pro` 独立运行测试。测试在后台使用 offscreen 平台，不打开浏览器。Windows 上如需保存包含中文的后台截图，可设置：
+
+```powershell
+$env:QT_QPA_FONTDIR = "C:/Windows/Fonts"
+$env:QT_TEACHING_SCREENSHOTS = "D:/QtTeachingScreenshots"
+```
+
+测试覆盖换算公式、非法输入、暂停与继续、延迟刷新、不重复抽签、分组完整性，以及主要按钮操作。具体版本、编译器和结果见 `verification/验证说明.md`。
+
diff --git a/Projects/Run_Qt5.14.2/ClassroomTimer.exe b/Projects/Run_Qt5.14.2/ClassroomTimer.exe
new file mode 100644
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new file mode 100644
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new file mode 100644
index 0000000..d75c183
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new file mode 100644
index 0000000..84511cc
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new file mode 100644
index 0000000..1d6873d
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new file mode 100644
index 0000000..a892b0f
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diff --git a/Projects/Run_Qt5.14.2/libgcc_s_seh-1.dll b/Projects/Run_Qt5.14.2/libgcc_s_seh-1.dll
new file mode 100644
index 0000000..4ec945b
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diff --git a/Projects/Run_Qt5.14.2/libstdc++-6.dll b/Projects/Run_Qt5.14.2/libstdc++-6.dll
new file mode 100644
index 0000000..8e55acc
Binary files /dev/null and b/Projects/Run_Qt5.14.2/libstdc++-6.dll differ
diff --git a/Projects/Run_Qt5.14.2/libwinpthread-1.dll b/Projects/Run_Qt5.14.2/libwinpthread-1.dll
new file mode 100644
index 0000000..d9f4e1a
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diff --git a/Projects/Run_Qt5.14.2/licenses/GCC-GPL-3.txt b/Projects/Run_Qt5.14.2/licenses/GCC-GPL-3.txt
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/GCC-GPL-3.txt
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
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+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
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+Additional permissions that are applicable to the entire Program shall
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+  9. Acceptance Not Required for Having Copies.
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+  10. Automatic Licensing of Downstream Recipients.
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+  A "contributor" is a copyright holder who authorizes use under this
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+  A patent license is "discriminatory" if it does not include within
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
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+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+  If the Program specifies that a proxy can decide which future
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+  Later license versions may give you additional or different
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
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+    This program is free software: you can redistribute it and/or modify
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+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
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+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Projects/Run_Qt5.14.2/licenses/GCC-Runtime-Exception.txt b/Projects/Run_Qt5.14.2/licenses/GCC-Runtime-Exception.txt
new file mode 100644
index 0000000..e1b3c69
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/GCC-Runtime-Exception.txt
@@ -0,0 +1,73 @@
+GCC RUNTIME LIBRARY EXCEPTION
+
+Version 3.1, 31 March 2009
+
+Copyright (C) 2009 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+This GCC Runtime Library Exception ("Exception") is an additional
+permission under section 7 of the GNU General Public License, version
+3 ("GPLv3"). It applies to a given file (the "Runtime Library") that
+bears a notice placed by the copyright holder of the file stating that
+the file is governed by GPLv3 along with this Exception.
+
+When you use GCC to compile a program, GCC may combine portions of
+certain GCC header files and runtime libraries with the compiled
+program. The purpose of this Exception is to allow compilation of
+non-GPL (including proprietary) programs to use, in this way, the
+header files and runtime libraries covered by this Exception.
+
+0. Definitions.
+
+A file is an "Independent Module" if it either requires the Runtime
+Library for execution after a Compilation Process, or makes use of an
+interface provided by the Runtime Library, but is not otherwise based
+on the Runtime Library.
+
+"GCC" means a version of the GNU Compiler Collection, with or without
+modifications, governed by version 3 (or a specified later version) of
+the GNU General Public License (GPL) with the option of using any
+subsequent versions published by the FSF.
+
+"GPL-compatible Software" is software whose conditions of propagation,
+modification and use would permit combination with GCC in accord with
+the license of GCC.
+
+"Target Code" refers to output from any compiler for a real or virtual
+target processor architecture, in executable form or suitable for
+input to an assembler, loader, linker and/or execution
+phase. Notwithstanding that, Target Code does not include data in any
+format that is used as a compiler intermediate representation, or used
+for producing a compiler intermediate representation.
+
+The "Compilation Process" transforms code entirely represented in
+non-intermediate languages designed for human-written code, and/or in
+Java Virtual Machine byte code, into Target Code. Thus, for example,
+use of source code generators and preprocessors need not be considered
+part of the Compilation Process, since the Compilation Process can be
+understood as starting with the output of the generators or
+preprocessors.
+
+A Compilation Process is "Eligible" if it is done using GCC, alone or
+with other GPL-compatible software, or if it is done without using any
+work based on GCC. For example, using non-GPL-compatible Software to
+optimize any GCC intermediate representations would not qualify as an
+Eligible Compilation Process.
+
+1. Grant of Additional Permission.
+
+You have permission to propagate a work of Target Code formed by
+combining the Runtime Library with Independent Modules, even if such
+propagation would otherwise violate the terms of GPLv3, provided that
+all Target Code was generated by Eligible Compilation Processes. You
+may then convey such a combination under terms of your choice,
+consistent with the licensing of the Independent Modules.
+
+2. No Weakening of GCC Copyleft.
+
+The availability of this Exception does not imply any general
+presumption that third-party software is unaffected by the copyleft
+requirements of the license of GCC.
+
diff --git a/Projects/Run_Qt5.14.2/licenses/MinGW-runtime.txt b/Projects/Run_Qt5.14.2/licenses/MinGW-runtime.txt
new file mode 100644
index 0000000..3d11e87
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/MinGW-runtime.txt
@@ -0,0 +1,240 @@
+MinGW-w64 runtime licensing
+***************************
+
+This program or library was built using MinGW-w64 and statically
+linked against the MinGW-w64 runtime. Some parts of the runtime
+are under licenses which require that the copyright and license
+notices are included when distributing the code in binary form.
+These notices are listed below.
+
+
+========================
+Overall copyright notice
+========================
+
+Copyright (c) 2009, 2010 by the mingw-w64 project
+
+This license has been certified as open source. It has also been designated
+as GPL compatible by the Free Software Foundation (FSF).
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+   1. Redistributions in source code must retain the accompanying copyright
+      notice, this list of conditions, and the following disclaimer.
+   2. Redistributions in binary form must reproduce the accompanying
+      copyright notice, this list of conditions, and the following disclaimer
+      in the documentation and/or other materials provided with the
+      distribution.
+   3. Names of the copyright holders must not be used to endorse or promote
+      products derived from this software without prior written permission
+      from the copyright holders.
+   4. The right to distribute this software or to use it for any purpose does
+      not give you the right to use Servicemarks (sm) or Trademarks (tm) of
+      the copyright holders.  Use of them is covered by separate agreement
+      with the copyright holders.
+   5. If any files are modified, you must cause the modified files to carry
+      prominent notices stating that you changed the files and the date of
+      any change.
+
+Disclaimer
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+======================================== 
+getopt, getopt_long, and getop_long_only
+======================================== 
+
+Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com> 
+ 
+Permission to use, copy, modify, and distribute this software for any 
+purpose with or without fee is hereby granted, provided that the above 
+copyright notice and this permission notice appear in all copies. 
+ 	 
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+Sponsored in part by the Defense Advanced Research Projects
+Agency (DARPA) and Air Force Research Laboratory, Air Force
+Materiel Command, USAF, under agreement number F39502-99-1-0512.
+
+        *       *       *       *       *       *       * 
+
+Copyright (c) 2000 The NetBSD Foundation, Inc.
+All rights reserved.
+
+This code is derived from software contributed to The NetBSD Foundation
+by Dieter Baron and Thomas Klausner.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+ 1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+
+===============================================================
+gdtoa: Converting between IEEE floating point numbers and ASCII
+===============================================================
+
+The author of this software is David M. Gay.
+
+Copyright (C) 1997, 1998, 1999, 2000, 2001 by Lucent Technologies
+All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appear in all
+copies and that both that the copyright notice and this
+permission notice and warranty disclaimer appear in supporting
+documentation, and that the name of Lucent or any of its entities
+not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
+IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
+SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+
+        *       *       *       *       *       *       *
+
+The author of this software is David M. Gay.
+
+Copyright (C) 2005 by David M. Gay
+All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that the copyright notice and this permission notice and warranty
+disclaimer appear in supporting documentation, and that the name of
+the author or any of his current or former employers not be used in
+advertising or publicity pertaining to distribution of the software
+without specific, written prior permission.
+
+THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN
+NO EVENT SHALL THE AUTHOR OR ANY OF HIS CURRENT OR FORMER EMPLOYERS BE
+LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+        *       *       *       *       *       *       *
+
+The author of this software is David M. Gay.
+
+Copyright (C) 2004 by David M. Gay.
+All Rights Reserved
+Based on material in the rest of /netlib/fp/gdota.tar.gz,
+which is copyright (C) 1998, 2000 by Lucent Technologies.
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appear in all
+copies and that both that the copyright notice and this
+permission notice and warranty disclaimer appear in supporting
+documentation, and that the name of Lucent or any of its entities
+not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
+IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
+SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+
+
+=========================
+Parts of the math library
+=========================
+
+Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+
+Developed at SunSoft, a Sun Microsystems, Inc. business.
+Permission to use, copy, modify, and distribute this
+software is freely granted, provided that this notice
+is preserved.
+
+        *       *       *       *       *       *       *
+
+Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+
+Developed at SunPro, a Sun Microsystems, Inc. business.
+Permission to use, copy, modify, and distribute this
+software is freely granted, provided that this notice
+is preserved.
+
+        *       *       *       *       *       *       *
+
+FIXME: Cephes math lib
+Copyright (C) 1984-1998 Stephen L. Moshier
+
+It sounds vague, but as to be found at
+<http://lists.debian.org/debian-legal/2004/12/msg00295.html>, it gives an
+impression that the author could be willing to give an explicit
+permission to distribute those files e.g. under a BSD style license. So
+probably there is no problem here, although it could be good to get a
+permission from the author and then add a license into the Cephes files
+in MinGW runtime. At least on follow-up it is marked that debian sees the
+version a-like BSD one. As MinGW.org (where those cephes parts are coming
+from) distributes them now over 6 years, it should be fine.
+
+===================================
+Headers and IDLs imported from Wine
+===================================
+
+Some header and IDL files were imported from the Wine project. These files
+are prominent maked in source. Their copyright belongs to contributors and
+they are distributed under LGPL license.
+
+Disclaimer
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
diff --git a/Projects/Run_Qt5.14.2/licenses/Qt-GPL-3.txt b/Projects/Run_Qt5.14.2/licenses/Qt-GPL-3.txt
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/Qt-GPL-3.txt
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
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+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
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+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
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+
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+stand ready to extend this provision to those domains in future versions
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+  Finally, every program is threatened constantly by software patents.
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+
+  "This License" refers to version 3 of the GNU General Public License.
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+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+  13. Use with the GNU Affero General Public License.
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+  If the Program specifies that a proxy can decide which future
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+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
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+an absolute waiver of all civil liability in connection with the
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+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
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+  If you develop a new program, and you want it to be of the greatest
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+    This program is free software: you can redistribute it and/or modify
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+    This program is distributed in the hope that it will be useful,
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+Also add information on how to contact you by electronic and paper mail.
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+  If the program does terminal interaction, make it output a short
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+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
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+
+The hypothetical commands `show w' and `show c' should show the appropriate
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+
+  You should also get your employer (if you work as a programmer) or school,
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+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
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+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Projects/Run_Qt5.14.2/licenses/Qt-LGPL-3.txt b/Projects/Run_Qt5.14.2/licenses/Qt-LGPL-3.txt
new file mode 100644
index 0000000..65c5ca8
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/Qt-LGPL-3.txt
@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
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+Defining a subclass of a class defined by the Library is deemed a mode
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+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
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+  If you modify a copy of the Library, and, in your modifications, a
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+version:
+
+   a) under this License, provided that you make a good faith effort to
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+
+   b) under the GNU GPL, with none of the additional permissions of
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+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
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+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
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+
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+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
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+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
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+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
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+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
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+       recombine or relink the Application with a modified version of
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+   e) Provide Installation Information, but only if you would otherwise
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+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
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+  5. Combined Libraries.
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+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
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+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/Projects/Run_Qt5.14.2/licenses/winpthreads.txt b/Projects/Run_Qt5.14.2/licenses/winpthreads.txt
new file mode 100644
index 0000000..3507701
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/winpthreads.txt
@@ -0,0 +1,57 @@
+Copyright (c) 2011 mingw-w64 project
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+
+/*
+ * Parts of this library are derived by:
+ *
+ * Posix Threads library for Microsoft Windows
+ *
+ * Use at own risk, there is no implied warranty to this code.
+ * It uses undocumented features of Microsoft Windows that can change
+ * at any time in the future.
+ *
+ * (C) 2010 Lockless Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  * Neither the name of Lockless Inc. nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AN
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
diff --git a/Projects/Run_Qt5.14.2/licenses/第三方组件说明.txt b/Projects/Run_Qt5.14.2/licenses/第三方组件说明.txt
new file mode 100644
index 0000000..5bf9977
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/licenses/第三方组件说明.txt
@@ -0,0 +1,9 @@
+演示程序动态链接 Qt 5.14.2 的 Qt Core、Qt Gui 和 Qt Widgets，并附带 Windows 平台插件。
+Qt 著作权属于 The Qt Company 及相应贡献者。
+Qt 源码与版本信息：https://download.qt.io/archive/qt/5.14/5.14.2/
+Qt Base 对应源码：https://code.qt.io/cgit/qt/qtbase.git/tree/?h=v5.14.2
+
+本目录保留 GNU LGPL v3、GNU GPL v3、GCC 运行库例外，以及 MinGW / winpthreads 的相关许可文本。
+GNU 标准许可文本取自本机 Qt 源码的 LICENSES 目录；MinGW 相关文本取自匹配的 MinGW 7.3 工具链。
+项目源代码和重新构建方法位于上一级 Projects 目录的三个工程与 README 中。
+
diff --git a/Projects/Run_Qt5.14.2/platforms/qwindows.dll b/Projects/Run_Qt5.14.2/platforms/qwindows.dll
new file mode 100644
index 0000000..b02c018
Binary files /dev/null and b/Projects/Run_Qt5.14.2/platforms/qwindows.dll differ
diff --git a/Projects/Run_Qt5.14.2/qt.conf b/Projects/Run_Qt5.14.2/qt.conf
new file mode 100644
index 0000000..f783bdb
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/qt.conf
@@ -0,0 +1,3 @@
+[Paths]
+Prefix=.
+Plugins=.
diff --git a/Projects/Run_Qt5.14.2/使用说明.txt b/Projects/Run_Qt5.14.2/使用说明.txt
new file mode 100644
index 0000000..0204635
--- /dev/null
+++ b/Projects/Run_Qt5.14.2/使用说明.txt
@@ -0,0 +1,8 @@
+直接双击以下程序：
+UnitConverter.exe：单位换算器
+ClassroomTimer.exe：课堂计时器
+RaffleGroups.exe：随机抽签与分组工具
+
+这些演示程序使用 Qt 5.14.2，适用于 Windows 64 位。
+复制到其他位置时，请复制整个文件夹，保留 DLL、qt.conf 和 platforms 文件夹。
+对应源码、Qt Creator 工程和教学说明位于上一级目录的三个项目文件夹。
diff --git a/Projects/verification/files_sha256.json b/Projects/verification/files_sha256.json
new file mode 100644
index 0000000..f43248d
--- /dev/null
+++ b/Projects/verification/files_sha256.json
@@ -0,0 +1,367 @@
+[
+  {
+    "Path": ".gitignore",
+    "Bytes": 46,
+    "SHA256": "729579E4DDF0ED47CAB70376FAB0D0501FF1F5C5D7AC50C70293E6FAF37619DB"
+  },
+  {
+    "Path": "CMakeLists.txt",
+    "Bytes": 301,
+    "SHA256": "6B4F65FFF7DB117DCBB402A84ECACA1CBE9F4DB78244502C8F5AB34739A1AF82"
+  },
+  {
+    "Path": "QtTeachingProjects.pro",
+    "Bytes": 202,
+    "SHA256": "1B1CC3F473A2A279B34FBDC764D6792B69431CBEB412D9C6DDB95D4D02A27451"
+  },
+  {
+    "Path": "README.md",
+    "Bytes": 3925,
+    "SHA256": "C0EFDA0486386EEE2E59CDEA1C12F95BAA65A5929AC77D20D69319D925E2AA55"
+  },
+  {
+    "Path": "01_UnitConverter\\appearance.h",
+    "Bytes": 1987,
+    "SHA256": "108BE9DB48929BA793DEDF15C50EFCCA076DE011E05E2924709431F70D10D764"
+  },
+  {
+    "Path": "01_UnitConverter\\CMakeLists.txt",
+    "Bytes": 1514,
+    "SHA256": "69120A897E875DF8DF135077555B215BCDB328D8700E66285443A034C1E35226"
+  },
+  {
+    "Path": "01_UnitConverter\\conversion.cpp",
+    "Bytes": 4036,
+    "SHA256": "8AE070A1C7E746E463C630CDF41B0CAC27CE5B4F70071FC167AA2531385A024A"
+  },
+  {
+    "Path": "01_UnitConverter\\conversion.h",
+    "Bytes": 349,
+    "SHA256": "31E3B464E78D126C4664DCAC9918D39E5ABEE8CFFE8BB5823C36771CF06BC387"
+  },
+  {
+    "Path": "01_UnitConverter\\main.cpp",
+    "Bytes": 466,
+    "SHA256": "EA31C353F95B264D131797B862378693C8FBD1CEE97B97ADE143BA8EEBFB1319"
+  },
+  {
+    "Path": "01_UnitConverter\\mainwindow.cpp",
+    "Bytes": 3384,
+    "SHA256": "31794F8B3CE67449674C0DE610E93CAA2916D73BA6F2FD5E6B7A4819FED67BFD"
+  },
+  {
+    "Path": "01_UnitConverter\\mainwindow.h",
+    "Bytes": 326,
+    "SHA256": "CC7515940619ACB6C103867B4C78160335CEDE2E4DCFCE5FD8F21D2A8A070EE7"
+  },
+  {
+    "Path": "01_UnitConverter\\mainwindow.ui",
+    "Bytes": 7072,
+    "SHA256": "9CC4D08B107D74C50C857B14C12CCDF93F1FEA2C2DDA0104E31CAB812D3F4AF1"
+  },
+  {
+    "Path": "01_UnitConverter\\README.md",
+    "Bytes": 3198,
+    "SHA256": "EF3E361F701F54B109569BFC46E22555EC234DBD084FFA137225521C0F167F26"
+  },
+  {
+    "Path": "01_UnitConverter\\UnitConverter.pro",
+    "Bytes": 260,
+    "SHA256": "1B193678D6BA461157590E3A004C44C2494B508DE7A0899A8DB93E152714DC94"
+  },
+  {
+    "Path": "01_UnitConverter\\tests\\test_UnitConverter.cpp",
+    "Bytes": 4460,
+    "SHA256": "6C6AF6A13F7D90DFFD667760ED66F7370505B1027F33C8D798A389F00E169370"
+  },
+  {
+    "Path": "01_UnitConverter\\tests\\test_UnitConverter.pro",
+    "Bytes": 337,
+    "SHA256": "8CA1B47AF0C2449B3E810C34C3C0796632BF08887D7C165A1921EC48E4AB8FAF"
+  },
+  {
+    "Path": "02_ClassroomTimer\\appearance.h",
+    "Bytes": 1987,
+    "SHA256": "108BE9DB48929BA793DEDF15C50EFCCA076DE011E05E2924709431F70D10D764"
+  },
+  {
+    "Path": "02_ClassroomTimer\\ClassroomTimer.pro",
+    "Bytes": 259,
+    "SHA256": "9544F5A3EFF1109DE3CF3A22E6C0B38AB99C52C234A2B49F76EBC85B19F4BDA7"
+  },
+  {
+    "Path": "02_ClassroomTimer\\CMakeLists.txt",
+    "Bytes": 1519,
+    "SHA256": "1CB8393F4737A3A76BC177F597E85DF2AFFE3B8B52274AEC94C6F91EA12FFD1D"
+  },
+  {
+    "Path": "02_ClassroomTimer\\countdown.cpp",
+    "Bytes": 1484,
+    "SHA256": "FD74A24071882025F4DCDD4AD2E4D8EE230680228C53E31A8F9A49982E155936"
+  },
+  {
+    "Path": "02_ClassroomTimer\\countdown.h",
+    "Bytes": 689,
+    "SHA256": "617004850F4157BCD29DC631D7A0EA6FD9CF287A9B8CDB9BB8C1251D0DF6A129"
+  },
+  {
+    "Path": "02_ClassroomTimer\\main.cpp",
+    "Bytes": 466,
+    "SHA256": "EA31C353F95B264D131797B862378693C8FBD1CEE97B97ADE143BA8EEBFB1319"
+  },
+  {
+    "Path": "02_ClassroomTimer\\mainwindow.cpp",
+    "Bytes": 3962,
+    "SHA256": "7D5CE3593957D8808794045AEDA16FEE740EDFE67024C11FD08632509D9CF9B9"
+  },
+  {
+    "Path": "02_ClassroomTimer\\mainwindow.h",
+    "Bytes": 452,
+    "SHA256": "79AFDE69E2110147E1565388A25D9E65EFE1AF97900613CA50F6762232EC17C2"
+  },
+  {
+    "Path": "02_ClassroomTimer\\mainwindow.ui",
+    "Bytes": 6743,
+    "SHA256": "4494EDD52C5ECA186F38BA567FD7E21697E8BCC7E0F78811CD00656E0D24B1BE"
+  },
+  {
+    "Path": "02_ClassroomTimer\\README.md",
+    "Bytes": 3214,
+    "SHA256": "FC7046ADCBC50F464C5C1A085FDEB0D1B25C20749B31FD7397985F2C3EC5AAF4"
+  },
+  {
+    "Path": "02_ClassroomTimer\\tests\\test_ClassroomTimer.cpp",
+    "Bytes": 3770,
+    "SHA256": "0B68CE3D132361E0699C6375993908D39ECC741AA506EECB605676B93A1D9ECC"
+  },
+  {
+    "Path": "02_ClassroomTimer\\tests\\test_ClassroomTimer.pro",
+    "Bytes": 337,
+    "SHA256": "14D37177C38258C5241332BFA61BC1860C4F169540E869C87D47B3770D941581"
+  },
+  {
+    "Path": "03_RaffleGroups\\appearance.h",
+    "Bytes": 1987,
+    "SHA256": "108BE9DB48929BA793DEDF15C50EFCCA076DE011E05E2924709431F70D10D764"
+  },
+  {
+    "Path": "03_RaffleGroups\\CMakeLists.txt",
+    "Bytes": 1489,
+    "SHA256": "77F4C5021B5C01906959DF7914DC369FA996BDD9E4496EFD84ECF69BED8022D2"
+  },
+  {
+    "Path": "03_RaffleGroups\\main.cpp",
+    "Bytes": 466,
+    "SHA256": "EA31C353F95B264D131797B862378693C8FBD1CEE97B97ADE143BA8EEBFB1319"
+  },
+  {
+    "Path": "03_RaffleGroups\\mainwindow.cpp",
+    "Bytes": 5210,
+    "SHA256": "A6441794ED93E60E5D3844C01D738BEC684D0D82C0A56D48C81137150549649D"
+  },
+  {
+    "Path": "03_RaffleGroups\\mainwindow.h",
+    "Bytes": 465,
+    "SHA256": "D39048178C9074C0D619E2154881BDDE60F50EFFBD914E488D7C0F01A6645125"
+  },
+  {
+    "Path": "03_RaffleGroups\\mainwindow.ui",
+    "Bytes": 10094,
+    "SHA256": "CFE1DF1AA0BC5BA33F3663D7EDA804F50C9109392E4D746C9233A76ED0086F39"
+  },
+  {
+    "Path": "03_RaffleGroups\\RaffleGroups.pro",
+    "Bytes": 251,
+    "SHA256": "9DB543BDBF066146052AB20D9AE62E360F1D2226E47B2ACC7C751D7EC91BF8C5"
+  },
+  {
+    "Path": "03_RaffleGroups\\README.md",
+    "Bytes": 3651,
+    "SHA256": "1803EB4191BEA1134B245982840A0A996D88BE5404E9FA272613551B50A214EF"
+  },
+  {
+    "Path": "03_RaffleGroups\\roster.cpp",
+    "Bytes": 2619,
+    "SHA256": "D7BDCCB6AE7141A8187BC31A1B0F6A35F01B182AB9F31C67FEE3F50672EE8B4C"
+  },
+  {
+    "Path": "03_RaffleGroups\\roster.h",
+    "Bytes": 729,
+    "SHA256": "3C606C81BE3546009F6A613A0AF77BFDADE6181BED1C8440C9810682DE7ABC66"
+  },
+  {
+    "Path": "03_RaffleGroups\\sample_roster.txt",
+    "Bytes": 121,
+    "SHA256": "B787A4D366A058D41D9255A5982C85D52FA4455F12A4A65A9ADC8EE36C554C1E"
+  },
+  {
+    "Path": "03_RaffleGroups\\tests\\test_RaffleGroups.cpp",
+    "Bytes": 5367,
+    "SHA256": "199B4CD1F49B2165B3524331060E8C40999FCD3EC4F082E5670F08C25049E192"
+  },
+  {
+    "Path": "03_RaffleGroups\\tests\\test_RaffleGroups.pro",
+    "Bytes": 327,
+    "SHA256": "6EEAE8842CD82013C39B340D6433703F8C30A672119F496C45405AC6D80874FB"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\使用说明.txt",
+    "Bytes": 412,
+    "SHA256": "BD431D99BD6BB8B6AB883B311C9A886A41316C50D2DC265151AF0C0A2AEE10D7"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\ClassroomTimer.exe",
+    "Bytes": 119497,
+    "SHA256": "3FA59945C0CB5D224C8EDBFBC5A194A9F9A4D4616830727B85DD221B12239317"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\libgcc_s_seh-1.dll",
+    "Bytes": 74240,
+    "SHA256": "479907904ACF2836A3E103A192393E98C98CFDDC1B4C0B8FF20A442521900C6A"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\libstdc++-6.dll",
+    "Bytes": 1425920,
+    "SHA256": "CDD31659DEDFC2AAC51B2CABB77C061603FD3F91FE98958B9C179CC3F4AC6104"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\libwinpthread-1.dll",
+    "Bytes": 52224,
+    "SHA256": "BD4F622A67E6F33AEC119D987B1AE2B0FC52B8D5A1B2A805AAB654D507F569D3"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\qt.conf",
+    "Bytes": 27,
+    "SHA256": "D23E982F2910242A2BCDF7DABE68B036DE9D2BB8FFAD64FA9F86020C3AD118A4"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\Qt5Core.dll",
+    "Bytes": 8343776,
+    "SHA256": "019AB6AA811087B36D0A91C35A70B8EB7756B7F0F072AFA0449B3805CCAC7EFC"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\Qt5Gui.dll",
+    "Bytes": 9844240,
+    "SHA256": "43DEED28133C0E530ED44FFF3649A87022A80BDB4EF493048518C72AC4656B99"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\Qt5Widgets.dll",
+    "Bytes": 8623912,
+    "SHA256": "90FE759952447724DA52351E7BCEE6F51248B5D9577AB39F22BFD548C8931DE9"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\RaffleGroups.exe",
+    "Bytes": 148616,
+    "SHA256": "73217FC7CDED5755FE2C76AFB7EB2165EA4C1C637D8936A15AABAF30AC7AB277"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\UnitConverter.exe",
+    "Bytes": 136248,
+    "SHA256": "626CE8709EF092C45AC9E41B93AF14DEA0E94BDDD1375CFC19A060EFB790FE72"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\第三方组件说明.txt",
+    "Bytes": 656,
+    "SHA256": "B5938BE4B6562FFF6EAC0CC33EA5946E8909896C05977AEA747EA0DD860236B3"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\GCC-GPL-3.txt",
+    "Bytes": 35147,
+    "SHA256": "8CEB4B9EE5ADEDDE47B31E975C1D90C73AD27B6B165A1DCD80C7C545EB65B903"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\GCC-Runtime-Exception.txt",
+    "Bytes": 3324,
+    "SHA256": "9D6B43CE4D8DE0C878BF16B54D8E7A10D9BD42B75178153E3AF6A815BDC90F74"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\MinGW-runtime.txt",
+    "Bytes": 10918,
+    "SHA256": "36A4857B6557A97BAA82762444FFD6A74C7575015595DC26FF02215C299F81F6"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\Qt-GPL-3.txt",
+    "Bytes": 35821,
+    "SHA256": "0B383D5A63DA644F628D99C33976EA6487ED89AAA59F0B3257992DEAC1171E6B"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\Qt-LGPL-3.txt",
+    "Bytes": 7816,
+    "SHA256": "EA7D049C7705DC13AFC202DD18E1827F3484F8212FD3FA7B82FC4A0C363432C9"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\licenses\\winpthreads.txt",
+    "Bytes": 2883,
+    "SHA256": "63263614CDD29F2F93CBA85E992F041B31F9FC7B4033692F31269489A8A1B177"
+  },
+  {
+    "Path": "Run_Qt5.14.2\\platforms\\qwindows.dll",
+    "Bytes": 2849024,
+    "SHA256": "8F462FD49888E422BB459628AFE97A7A856F51BC8408C91F6175D77AA978B605"
+  },
+  {
+    "Path": "verification\\验证说明.md",
+    "Bytes": 2537,
+    "SHA256": "27B0246774D54E063B53ED6A1C77D88DAB4E9FD0A63D3E17ED8B6ED5DF23A6CA"
+  },
+  {
+    "Path": "verification\\portable_smoke.txt",
+    "Bytes": 231,
+    "SHA256": "626B47068405FF67348C15C0F89E6388F7A543DD5D1AE216E0E363E4104B83B4"
+  },
+  {
+    "Path": "verification\\qmake683_build.txt",
+    "Bytes": 18069,
+    "SHA256": "D38AA692B8B916EDC53B30CDB9002EC763ECC23E91244D6A2CBB55CDBED0ED44"
+  },
+  {
+    "Path": "verification\\qt5142_ClassroomTimer.txt",
+    "Bytes": 679,
+    "SHA256": "0C18D45B89173EB612A868F79C474490D9164CA8C781AB85916EE9BDE4DDDB40"
+  },
+  {
+    "Path": "verification\\qt5142_RaffleGroups.txt",
+    "Bytes": 677,
+    "SHA256": "FE6DD18903780A156A197AB7048DA5225CD0DB41E54F2045144B51F750185085"
+  },
+  {
+    "Path": "verification\\qt5142_UnitConverter.txt",
+    "Bytes": 1191,
+    "SHA256": "763725EA7A34E0A0014DEBCD0A20330A3F882823E6FC4F8F1F9EC8C01DF50C84"
+  },
+  {
+    "Path": "verification\\qt683_ClassroomTimer.txt",
+    "Bytes": 690,
+    "SHA256": "CE7C41FA312973BE132B1144CE966C33F1B5ED8A5D22DB09D62A4311A948597E"
+  },
+  {
+    "Path": "verification\\qt683_RaffleGroups.txt",
+    "Bytes": 688,
+    "SHA256": "2CD33A7E124A717F4A4AFE0DA533C680305CB697C1050CD3CDEAAF193873268A"
+  },
+  {
+    "Path": "verification\\qt683_UnitConverter.txt",
+    "Bytes": 1202,
+    "SHA256": "35228DC497EC0F17ABFFAC18DDC28CE23D95C5DEE5BE055DC9C57336713449EC"
+  },
+  {
+    "Path": "verification\\screenshots_qt5142\\01_converter.png",
+    "Bytes": 60422,
+    "SHA256": "AECC6DE47E6EC08A037D168E242D49511AD5874F43CFE846518C98AA606E7496"
+  },
+  {
+    "Path": "verification\\screenshots_qt5142\\02_timer.png",
+    "Bytes": 41393,
+    "SHA256": "6CA8C94701FF5D8DDC985E606E6F356BBC13DBE84664E0F2EA431182D6C92D70"
+  },
+  {
+    "Path": "verification\\screenshots_qt5142\\03_groups.png",
+    "Bytes": 92544,
+    "SHA256": "64DD910770BAF4C09B6C525A705F369B5350766D86E481098BA8615762EC0D2C"
+  },
+  {
+    "Path": "verification\\screenshots_qt5142\\03_raffle.png",
+    "Bytes": 70879,
+    "SHA256": "53F205D53857004B97547DC7DAE7C897422DC808660B6DFB443FA962AF6E7BA8"
+  }
+]
diff --git a/Projects/verification/portable_smoke.txt b/Projects/verification/portable_smoke.txt
new file mode 100644
index 0000000..622b50d
--- /dev/null
+++ b/Projects/verification/portable_smoke.txt
@@ -0,0 +1,3 @@
+UnitConverter.exe : passed (local runtime, windows platform, normal exit 0)
+ClassroomTimer.exe : passed (local runtime, windows platform, normal exit 0)
+RaffleGroups.exe : passed (local runtime, windows platform, normal exit 0)
diff --git a/Projects/verification/qmake683_build.txt b/Projects/verification/qmake683_build.txt
new file mode 100644
index 0000000..30b1a90
--- /dev/null
+++ b/Projects/verification/qmake683_build.txt
@@ -0,0 +1,33 @@
+cd 01_UnitConverter\ && ( if not exist Makefile.UnitConverter D:\Qt\6.8.3\mingw_64\bin\qmake.exe -o Makefile.UnitConverter C:\Users\xiaolinquan\.codex\visualizations\2026\10\01\01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff\qt_widgets_projects\01_UnitConverter\UnitConverter.pro "CONFIG+=release" "CONFIG-=debug" "CONFIG-=debug_and_release" ) && D:/Qt/Tools/mingw1310_64/bin/mingw32-make -f Makefile.UnitConverter 
+cd 02_ClassroomTimer\ && ( if not exist Makefile.ClassroomTimer D:\Qt\6.8.3\mingw_64\bin\qmake.exe -o Makefile.ClassroomTimer C:\Users\xiaolinquan\.codex\visualizations\2026\10\01\01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff\qt_widgets_projects\02_ClassroomTimer\ClassroomTimer.pro "CONFIG+=release" "CONFIG-=debug" "CONFIG-=debug_and_release" ) && D:/Qt/Tools/mingw1310_64/bin/mingw32-make -f Makefile.ClassroomTimer 
+cd 03_RaffleGroups\ && ( if not exist Makefile.RaffleGroups D:\Qt\6.8.3\mingw_64\bin\qmake.exe -o Makefile.RaffleGroups C:\Users\xiaolinquan\.codex\visualizations\2026\10\01\01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff\qt_widgets_projects\03_RaffleGroups\RaffleGroups.pro "CONFIG+=release" "CONFIG-=debug" "CONFIG-=debug_and_release" ) && D:/Qt/Tools/mingw1310_64/bin/mingw32-make -f Makefile.RaffleGroups 
+mingw32-make[1]: Entering directory 'C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter'
+D:\Qt\6.8.3\mingw_64\bin\uic.exe ..\..\qt_widgets_projects\01_UnitConverter\mainwindow.ui -o ui_mainwindow.h
+mingw32-make[1]: Entering directory 'C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer'
+D:\Qt\6.8.3\mingw_64\bin\uic.exe ..\..\qt_widgets_projects\02_ClassroomTimer\mainwindow.ui -o ui_mainwindow.h
+mingw32-make[1]: Entering directory 'C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups'
+D:\Qt\6.8.3\mingw_64\bin\uic.exe ..\..\qt_widgets_projects\03_RaffleGroups\mainwindow.ui -o ui_mainwindow.h
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o main.o ..\..\qt_widgets_projects\01_UnitConverter\main.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o main.o ..\..\qt_widgets_projects\03_RaffleGroups\main.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o main.o ..\..\qt_widgets_projects\02_ClassroomTimer\main.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o mainwindow.o ..\..\qt_widgets_projects\01_UnitConverter\mainwindow.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o mainwindow.o ..\..\qt_widgets_projects\02_ClassroomTimer\mainwindow.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o mainwindow.o ..\..\qt_widgets_projects\03_RaffleGroups\mainwindow.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o conversion.o ..\..\qt_widgets_projects\01_UnitConverter\conversion.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o roster.o ..\..\qt_widgets_projects\03_RaffleGroups\roster.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o countdown.o ..\..\qt_widgets_projects\02_ClassroomTimer\countdown.cpp
+g++ -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -dM -E -o moc_predefs.h D:\Qt\6.8.3\mingw_64\mkspecs\features\data\dummy.cpp
+D:\Qt\6.8.3\mingw_64\bin\moc.exe -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN --include C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter/moc_predefs.h -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++ -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_widgets_projects/01_UnitConverter -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -I. -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++ -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/x86_64-w64-mingw32 -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/backward -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include-fixed -ID:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include ..\..\qt_widgets_projects\01_UnitConverter\mainwindow.h -o moc_mainwindow.cpp
+g++ -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -dM -E -o moc_predefs.h D:\Qt\6.8.3\mingw_64\mkspecs\features\data\dummy.cpp
+g++ -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -dM -E -o moc_predefs.h D:\Qt\6.8.3\mingw_64\mkspecs\features\data\dummy.cpp
+D:\Qt\6.8.3\mingw_64\bin\moc.exe -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN --include C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer/moc_predefs.h -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++ -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_widgets_projects/02_ClassroomTimer -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -I. -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++ -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/x86_64-w64-mingw32 -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/backward -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include-fixed -ID:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include ..\..\qt_widgets_projects\02_ClassroomTimer\mainwindow.h -o moc_mainwindow.cpp
+D:\Qt\6.8.3\mingw_64\bin\moc.exe -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN --include C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups/moc_predefs.h -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++ -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_widgets_projects/03_RaffleGroups -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -I. -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++ -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/x86_64-w64-mingw32 -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/backward -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include -ID:/Qt/Tools/mingw1310_64/lib/gcc/x86_64-w64-mingw32/13.1.0/include-fixed -ID:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include ..\..\qt_widgets_projects\03_RaffleGroups\mainwindow.h -o moc_mainwindow.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o moc_mainwindow.o moc_mainwindow.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o moc_mainwindow.o moc_mainwindow.cpp
+g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../../qt_widgets_projects/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -ID:/Qt/6.8.3/mingw_64/include -ID:/Qt/6.8.3/mingw_64/include/QtWidgets -ID:/Qt/6.8.3/mingw_64/include/QtGui -ID:/Qt/6.8.3/mingw_64/include/QtCore -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -IC:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups -I/include -ID:/Qt/6.8.3/mingw_64/mkspecs/win32-g++  -o moc_mainwindow.o moc_mainwindow.cpp
+g++ -Wl,-s -Wl,-subsystem,windows -mthreads -o UnitConverter.exe main.o mainwindow.o conversion.o moc_mainwindow.o D:\Qt\6.8.3\mingw_64\lib\libQt6Widgets.a D:\Qt\6.8.3\mingw_64\lib\libQt6Gui.a D:\Qt\6.8.3\mingw_64\lib\libQt6Core.a -lmingw32 D:\Qt\6.8.3\mingw_64\lib\libQt6EntryPoint.a -lshell32  
+g++ -Wl,-s -Wl,-subsystem,windows -mthreads -o ClassroomTimer.exe main.o mainwindow.o countdown.o moc_mainwindow.o D:\Qt\6.8.3\mingw_64\lib\libQt6Widgets.a D:\Qt\6.8.3\mingw_64\lib\libQt6Gui.a D:\Qt\6.8.3\mingw_64\lib\libQt6Core.a -lmingw32 D:\Qt\6.8.3\mingw_64\lib\libQt6EntryPoint.a -lshell32  
+mingw32-make[1]: Leaving directory 'C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/01_UnitConverter'
+g++ -Wl,-s -Wl,-subsystem,windows -mthreads -o RaffleGroups.exe main.o mainwindow.o roster.o moc_mainwindow.o D:\Qt\6.8.3\mingw_64\lib\libQt6Widgets.a D:\Qt\6.8.3\mingw_64\lib\libQt6Gui.a D:\Qt\6.8.3\mingw_64\lib\libQt6Core.a -lmingw32 D:\Qt\6.8.3\mingw_64\lib\libQt6EntryPoint.a -lshell32  
+mingw32-make[1]: Leaving directory 'C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/02_ClassroomTimer'
+mingw32-make[1]: Leaving directory 'C:/Users/xiaolinquan/.codex/visualizations/2026/10/01/01a0f7bf-59fd-7ee0-92ab-1e0ae9b29cff/qt_qmake683/03_RaffleGroups'
diff --git a/Projects/verification/qt5142_ClassroomTimer.txt b/Projects/verification/qt5142_ClassroomTimer.txt
new file mode 100644
index 0000000..78541dd
--- /dev/null
+++ b/Projects/verification/qt5142_ClassroomTimer.txt
@@ -0,0 +1,12 @@
+********* Start testing of TimerTest *********
+Config: Using QtTest library 5.14.2, Qt 5.14.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by GCC 7.3.0)
+PASS   : TimerTest::initTestCase()
+PASS   : TimerTest::pauseResumeAndDrift()
+PASS   : TimerTest::delayedRefreshAndReset()
+PASS   : TimerTest::zeroAndDeadlinePause()
+QDEBUG : TimerTest::uiWorkflow() FT_New_Face failed with index 0 : 2
+QWARN  : TimerTest::uiWorkflow() This plugin does not support propagateSizeHints()
+PASS   : TimerTest::uiWorkflow()
+PASS   : TimerTest::cleanupTestCase()
+Totals: 6 passed, 0 failed, 0 skipped, 0 blacklisted, 1460ms
+********* Finished testing of TimerTest *********
diff --git a/Projects/verification/qt5142_RaffleGroups.txt b/Projects/verification/qt5142_RaffleGroups.txt
new file mode 100644
index 0000000..c0380be
--- /dev/null
+++ b/Projects/verification/qt5142_RaffleGroups.txt
@@ -0,0 +1,12 @@
+********* Start testing of RaffleTest *********
+Config: Using QtTest library 5.14.2, Qt 5.14.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by GCC 7.3.0)
+PASS   : RaffleTest::initTestCase()
+PASS   : RaffleTest::parsing()
+PASS   : RaffleTest::drawingWithoutReplacement()
+PASS   : RaffleTest::groupingInvariants()
+QDEBUG : RaffleTest::uiWorkflow() FT_New_Face failed with index 0 : 2
+QWARN  : RaffleTest::uiWorkflow() This plugin does not support propagateSizeHints()
+PASS   : RaffleTest::uiWorkflow()
+PASS   : RaffleTest::cleanupTestCase()
+Totals: 6 passed, 0 failed, 0 skipped, 0 blacklisted, 249ms
+********* Finished testing of RaffleTest *********
diff --git a/Projects/verification/qt5142_UnitConverter.txt b/Projects/verification/qt5142_UnitConverter.txt
new file mode 100644
index 0000000..9d2cb51
--- /dev/null
+++ b/Projects/verification/qt5142_UnitConverter.txt
@@ -0,0 +1,22 @@
+********* Start testing of ConverterTest *********
+Config: Using QtTest library 5.14.2, Qt 5.14.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by GCC 7.3.0)
+PASS   : ConverterTest::initTestCase()
+PASS   : ConverterTest::knownValues(freezing)
+PASS   : ConverterTest::knownValues(boiling)
+PASS   : ConverterTest::knownValues(minus40)
+PASS   : ConverterTest::knownValues(kelvin)
+PASS   : ConverterTest::knownValues(absolute-zero-C)
+PASS   : ConverterTest::knownValues(absolute-zero-F)
+PASS   : ConverterTest::knownValues(meter-cm)
+PASS   : ConverterTest::knownValues(inch-cm)
+PASS   : ConverterTest::knownValues(foot-meter)
+PASS   : ConverterTest::knownValues(km-mm)
+PASS   : ConverterTest::knownValues(scientific)
+PASS   : ConverterTest::knownValues(same-unit)
+PASS   : ConverterTest::rejectsInvalid()
+QDEBUG : ConverterTest::uiWorkflow() FT_New_Face failed with index 0 : 2
+QWARN  : ConverterTest::uiWorkflow() This plugin does not support propagateSizeHints()
+PASS   : ConverterTest::uiWorkflow()
+PASS   : ConverterTest::cleanupTestCase()
+Totals: 16 passed, 0 failed, 0 skipped, 0 blacklisted, 183ms
+********* Finished testing of ConverterTest *********
diff --git a/Projects/verification/qt683_ClassroomTimer.txt b/Projects/verification/qt683_ClassroomTimer.txt
new file mode 100644
index 0000000..15d9acf
--- /dev/null
+++ b/Projects/verification/qt683_ClassroomTimer.txt
@@ -0,0 +1,12 @@
+********* Start testing of TimerTest *********
+Config: Using QtTest library 6.8.3, Qt 6.8.3 (x86_64-little_endian-llp64 shared (dynamic) release build; by GCC 13.1.0), windows 11
+PASS   : TimerTest::initTestCase()
+PASS   : TimerTest::pauseResumeAndDrift()
+PASS   : TimerTest::delayedRefreshAndReset()
+PASS   : TimerTest::zeroAndDeadlinePause()
+QDEBUG : TimerTest::uiWorkflow() FT_New_Face failed with index 0 : 2
+QWARN  : TimerTest::uiWorkflow() This plugin does not support propagateSizeHints()
+PASS   : TimerTest::uiWorkflow()
+PASS   : TimerTest::cleanupTestCase()
+Totals: 6 passed, 0 failed, 0 skipped, 0 blacklisted, 1503ms
+********* Finished testing of TimerTest *********
diff --git a/Projects/verification/qt683_RaffleGroups.txt b/Projects/verification/qt683_RaffleGroups.txt
new file mode 100644
index 0000000..6eacdbd
--- /dev/null
+++ b/Projects/verification/qt683_RaffleGroups.txt
@@ -0,0 +1,12 @@
+********* Start testing of RaffleTest *********
+Config: Using QtTest library 6.8.3, Qt 6.8.3 (x86_64-little_endian-llp64 shared (dynamic) release build; by GCC 13.1.0), windows 11
+PASS   : RaffleTest::initTestCase()
+PASS   : RaffleTest::parsing()
+PASS   : RaffleTest::drawingWithoutReplacement()
+PASS   : RaffleTest::groupingInvariants()
+QDEBUG : RaffleTest::uiWorkflow() FT_New_Face failed with index 0 : 2
+QWARN  : RaffleTest::uiWorkflow() This plugin does not support propagateSizeHints()
+PASS   : RaffleTest::uiWorkflow()
+PASS   : RaffleTest::cleanupTestCase()
+Totals: 6 passed, 0 failed, 0 skipped, 0 blacklisted, 336ms
+********* Finished testing of RaffleTest *********
diff --git a/Projects/verification/qt683_UnitConverter.txt b/Projects/verification/qt683_UnitConverter.txt
new file mode 100644
index 0000000..9f14ff5
--- /dev/null
+++ b/Projects/verification/qt683_UnitConverter.txt
@@ -0,0 +1,22 @@
+********* Start testing of ConverterTest *********
+Config: Using QtTest library 6.8.3, Qt 6.8.3 (x86_64-little_endian-llp64 shared (dynamic) release build; by GCC 13.1.0), windows 11
+PASS   : ConverterTest::initTestCase()
+PASS   : ConverterTest::knownValues(freezing)
+PASS   : ConverterTest::knownValues(boiling)
+PASS   : ConverterTest::knownValues(minus40)
+PASS   : ConverterTest::knownValues(kelvin)
+PASS   : ConverterTest::knownValues(absolute-zero-C)
+PASS   : ConverterTest::knownValues(absolute-zero-F)
+PASS   : ConverterTest::knownValues(meter-cm)
+PASS   : ConverterTest::knownValues(inch-cm)
+PASS   : ConverterTest::knownValues(foot-meter)
+PASS   : ConverterTest::knownValues(km-mm)
+PASS   : ConverterTest::knownValues(scientific)
+PASS   : ConverterTest::knownValues(same-unit)
+PASS   : ConverterTest::rejectsInvalid()
+QDEBUG : ConverterTest::uiWorkflow() FT_New_Face failed with index 0 : 2
+QWARN  : ConverterTest::uiWorkflow() This plugin does not support propagateSizeHints()
+PASS   : ConverterTest::uiWorkflow()
+PASS   : ConverterTest::cleanupTestCase()
+Totals: 16 passed, 0 failed, 0 skipped, 0 blacklisted, 280ms
+********* Finished testing of ConverterTest *********
diff --git a/Projects/verification/screenshots_qt5142/01_converter.png b/Projects/verification/screenshots_qt5142/01_converter.png
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diff --git a/Projects/verification/screenshots_qt5142/02_timer.png b/Projects/verification/screenshots_qt5142/02_timer.png
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index 0000000..8266403
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diff --git a/Projects/verification/screenshots_qt5142/03_groups.png b/Projects/verification/screenshots_qt5142/03_groups.png
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diff --git a/Projects/verification/screenshots_qt5142/03_raffle.png b/Projects/verification/screenshots_qt5142/03_raffle.png
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diff --git a/Projects/verification/验证说明.md b/Projects/verification/验证说明.md
new file mode 100644
index 0000000..97aec85
--- /dev/null
+++ b/Projects/verification/验证说明.md
@@ -0,0 +1,32 @@
+# 构建与验证记录
+
+验证日期：2026-11-05。
+
+## 实际运行的版本
+
+| 环境 | 构建方式 | C++ 标准 | 结果 |
+|---|---|---|---|
+| Qt 5.14.2 / MinGW 7.3.0 64 位 | CMake 3.30.5 + Ninja | C++14 | 三个应用构建通过，三组测试通过 |
+| Qt 6.8.3 / MinGW 13.1.0 64 位 | CMake 3.30.5 + Ninja | C++17 | 三个应用构建通过，三组测试通过 |
+| 本机 Qt 6.8.3 / MinGW 13.1.0 | qmake + mingw32-make | C++17 | 三个 .pro 工程构建通过 |
+
+Qt 5.14.2 使用 Qt 官方归档中的 Qt Base 与匹配的 MinGW 7.3 工具链，下载包已对照官方 SHA-1 校验。Qt 6.8.3 使用本机 D:/Qt 中的 Kit。
+
+独立 Qt 5.14.2 归档中的 qmake 在许可检查阶段停止，因此本次不宣称 Qt 5 的 qmake 构建已经通过，也没有修改许可检查。Qt 5.14.2 的兼容性验证来自真实的 CMake 编译、链接和测试运行。交付的 .pro 使用常规 Widgets、FORMS 和 C++14 配置，并已在本机 Qt 6 的 qmake 中验证。
+
+## 自动化测试范围
+
+- 单位换算：12 组已知结果、绝对零度边界、非法文本、负长度、溢出，以及换算、切换类型、交换单位和清除旧结果的界面流程。
+- 计时器：连续点击开始、暂停与继续、延迟刷新、截止时刻暂停、复位、零时长，以及界面上的真实计时过程。
+- 抽签与分组：空名单、重复条目、同名不同学号、不重复抽签、候选池重置；对 1—100 人分别验证两种分组方式，检查总人数、唯一性、人数上限和组间人数差；检查编辑名单后的按钮与结果状态。
+
+每个 Qt 版本的 Qt Test 报告分别记为 16、6、6 项通过，其中包含初始化和清理项。全部测试均无失败。逐项结果保存在同目录的六个 qt5142_*.txt / qt683_*.txt 文件中。
+
+## 界面和运行库
+
+Qt 5.14.2 的四张截图保存在 screenshots_qt5142，覆盖单位换算、课堂计时、抽签和分组页面。已逐张查看中文显示、按钮文字、布局和结果区域。
+
+Run_Qt5.14.2 中包含三个 Release EXE、Qt Core/Gui/Widgets、Windows 平台插件及匹配的 MinGW 运行库。启动验证时从进程 PATH 中移除 Qt 与编译器目录，使用 Windows 平台创建窗口，并向本次启动的进程发送正常关闭消息。三个程序均退出为 0，记录见 portable_smoke.txt。
+
+本次没有使用 QML 或 Qt Quick，也没有打开浏览器进行检查。验证范围为本机 Windows 64 位；系统提示音是否可听见仍取决于系统声音设置。
+
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