优化字体与布局

src/main/java/com/mathapp/MathApp.java

@@ -103,7 +103,7 @@ public class MathApp extends JFrame {
     // 设置现代化UI外观
     FlatLightLaf.setup();
     // 全局UI定制
-    UIManager.put("Button.arc", 999);
+    UIManager.put("Button.arc", 15);
     UIManager.put("Component.arc", 15);
     UIManager.put("ProgressBar.arc", 999);
     UIManager.put("TextComponent.arc", 15);

src/main/java/com/mathapp/panels/ChangePasswordPanel.java

@@ -20,10 +20,10 @@ public class ChangePasswordPanel extends JPanel {
     GridBagConstraints gbc = new GridBagConstraints();
 
     JLabel titleLabel = new JLabel("修改密码", SwingConstants.CENTER);
-    titleLabel.setFont(new Font("思源黑体", Font.BOLD, 32));
+    titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 32));
 
     JLabel infoLabel = new JLabel("新密码需6-10位，且包含大小写字母和数字", SwingConstants.CENTER);
-    infoLabel.setFont(new Font("思源黑体", Font.PLAIN, 12));
+    infoLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
 
     oldPasswordField = new JPasswordField(20);
     newPasswordField = new JPasswordField(20);

src/main/java/com/mathapp/panels/LoginPanel.java

@@ -24,11 +24,11 @@ public class LoginPanel extends JPanel {
     passwordField = new JPasswordField(20);
 
     JButton loginButton = new JButton("登录");
-    loginButton.setFont(new Font("思源黑体", Font.PLAIN, 16));
+    loginButton.setFont(new Font("微软雅黑", Font.PLAIN, 16));
     loginButton.setPreferredSize(new Dimension(120, 40));
 
     JButton registerButton = new JButton("没有账户？立即注册");
-    registerButton.setFont(new Font("思源黑体", Font.PLAIN, 12));
+    registerButton.setFont(new Font("微软雅黑", Font.PLAIN, 12));
     registerButton.setBorderPainted(false);
     registerButton.setContentAreaFilled(false);
     registerButton.setFocusPainted(false);
@@ -83,7 +83,7 @@ public class LoginPanel extends JPanel {
     }
 
     User user = DataPersistence.findUserByEmail(email);
-    if (user != null && user.verifyPassword(password)||true) {
+    if (user != null && user.verifyPassword(password)) {
       app.setCurrentUserEmail(email);
       app.showPanel(MathApp.MAIN_MENU_PANEL);
     } else {

src/main/java/com/mathapp/panels/QuizPanel.java

@@ -24,7 +24,7 @@ public class QuizPanel extends JPanel {
     // 顶部面板：进度条和题号
     JPanel topPanel = new JPanel(new BorderLayout());
     questionLabel = new JLabel("题目 1/" + questionCount + ": ", SwingConstants.LEFT);
-    questionLabel.setFont(new Font("思源黑体", Font.BOLD, 20));
+    questionLabel.setFont(new Font("微软雅黑", Font.BOLD, 20));
     progressBar = new JProgressBar(0, questionCount);
     progressBar.setValue(0);
     progressBar.setStringPainted(true);
@@ -38,7 +38,7 @@ public class QuizPanel extends JPanel {
     optionButtons = new JRadioButton[4];
     for (int i = 0; i < 4; i++) {
       optionButtons[i] = new JRadioButton();
-      optionButtons[i].setFont(new Font("思源黑体", Font.PLAIN, 16));
+      optionButtons[i].setFont(new Font("微软雅黑", Font.PLAIN, 16));
       optionsGroup.add(optionButtons[i]);
       centerPanel.add(optionButtons[i]);
       centerPanel.add(Box.createVerticalStrut(10));
@@ -67,7 +67,7 @@ public class QuizPanel extends JPanel {
   }
 
   public void displayQuestion(Question question, int currentQuestionIndex, int totalQuestions) {
-    questionLabel.setText(String.format("题目 %d/%d: %s", currentQuestionIndex + 1, totalQuestions, question.problemStatement()));
+    questionLabel.setText(String.format("题目 %d/%d:     %s", currentQuestionIndex + 1, totalQuestions, question.problemStatement()));
     progressBar.setValue(currentQuestionIndex);
     java.util.List<String> options = question.options();
     for (int i = 0; i < optionButtons.length; i++) {

src/main/java/com/mathapp/panels/RegisterPanel.java

@@ -25,7 +25,7 @@ public class RegisterPanel extends JPanel {
     titleLabel.setFont(new Font("思源黑体", Font.BOLD, 32));
 
     emailField = new JTextField(20);
-    codeField = new JTextField(10);
+    codeField = new JTextField(11);
     getCodeButton = new JButton("获取验证码");
     JButton registerButton = new JButton("验证并设置密码");
     JButton backButton = new JButton("返回登录");

src/main/java/com/mathapp/panels/ResultsPanel.java

@@ -11,14 +11,14 @@ public class ResultsPanel extends JPanel {
     GridBagConstraints gbc = new GridBagConstraints();
 
     JLabel titleLabel = new JLabel("测验完成！", SwingConstants.CENTER);
-    titleLabel.setFont(new Font("思源黑体", Font.BOLD, 32));
+    titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 32));
 
     double percentage = (double) score / totalQuestions * 100;
     JLabel scoreLabel = new JLabel(String.format("你的得分: %.0f 分", percentage), SwingConstants.CENTER);
-    scoreLabel.setFont(new Font("思源黑体", Font.PLAIN, 24));
+    scoreLabel.setFont(new Font("微软雅黑", Font.PLAIN, 24));
 
     JLabel detailsLabel = new JLabel(String.format("（答对 %d 题，共 %d 题）", score, totalQuestions), SwingConstants.CENTER);
-    detailsLabel.setFont(new Font("思源黑体", Font.PLAIN, 16));
+    detailsLabel.setFont(new Font("微软雅黑", Font.PLAIN, 16));
 
 
     JButton againButton = new JButton("返回选择界面");

src/main/java/com/mathapp/panels/SetPasswordPanel.java

@@ -21,10 +21,10 @@ public class SetPasswordPanel extends JPanel {
     GridBagConstraints gbc = new GridBagConstraints();
 
     JLabel titleLabel = new JLabel("设置您的密码", SwingConstants.CENTER);
-    titleLabel.setFont(new Font("思源黑体", Font.BOLD, 32));
+    titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 32));
 
     JLabel infoLabel = new JLabel("密码需6-10位，且包含大小写字母和数字", SwingConstants.CENTER);
-    infoLabel.setFont(new Font("思源黑体", Font.PLAIN, 12));
+    infoLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
 
     passwordField = new JPasswordField(20);
     confirmPasswordField = new JPasswordField(20);