feat: 更新网站页面和组件，新增多个页面（关于、专家、会员、政策等）

app/assets/css/tailwind.css

@@ -1,3 +1,62 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+@layer base {
+  :root {
+    --gov-blue: #1e6fb5;
+    --gov-teal: #2ba69a;
+
+    --text-primary: #333333;
+    --text-secondary: #4b5563;
+    --text-tertiary: #6b7280;
+
+    --bg-page: #f7f9fc;
+    --bg-surface: #ffffff;
+    --border-subtle: rgba(0, 0, 0, 0.08);
+  }
+
+  html {
+    color: var(--text-primary);
+    background: var(--bg-page);
+    font-size: 16px;
+    line-height: 1.6;
+    text-size-adjust: 100%;
+    font-family: "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui,
+      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
+      "Apple Color Emoji", "Segoe UI Emoji";
+  }
+
+  body {
+    margin: 0;
+    color: var(--text-primary);
+    background: var(--bg-page);
+  }
+
+  a {
+    color: var(--gov-blue);
+    text-decoration-thickness: 1px;
+    text-underline-offset: 3px;
+  }
+
+  a:hover {
+    color: #185d96;
+  }
+
+  :focus-visible {
+    outline: 2px solid var(--gov-teal);
+    outline-offset: 2px;
+  }
+
+  #main-content {
+    scroll-margin-top: 120px;
+  }
+
+  html[data-contrast='high'] {
+    --text-primary: #0f172a;
+    --text-secondary: #111827;
+    --text-tertiary: #111827;
+    --bg-page: #ffffff;
+    --border-subtle: rgba(0, 0, 0, 0.2);
+  }
+}