/* roulang page: index */
:root {
      --primary: #0A66C2;
      --primary-dark: #084F8C;
      --accent: #F5A623;
      --accent-light: #FFB84D;
      --bg-light: #F7F9FC;
      --text-main: #0B1C2E;
      --text-body: #4A5568;
      --text-muted: #718096;
      --border-light: #E2E8F0;
      --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
      --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-dock: 40px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: #FFFFFF;
      color: var(--text-body);
      line-height: 1.6;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }
    h1 { font-size: 40px; }
    h2 { font-size: 32px; }
    h3 { font-size: 22px; font-weight: 600; }
    h4 { font-size: 18px; font-weight: 600; }
    p { margin: 0 0 16px; color: var(--text-body); }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--primary-dark);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .btn {
      display: inline-block;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      text-align: center;
      border: none;
      background: transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(10,102,194,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(10,102,194,0.3);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(10,102,194,0.05);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
      transform: scale(1.03);
    }
    .btn-accent {
      background: var(--accent);
      color: #0B1C2E;
      font-weight: 700;
    }
    .btn-accent:hover {
      background: var(--accent-light);
      transform: scale(1.03);
    }
    /* 浮动Dock导航 */
    .dock-nav {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 720px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 2px 14px rgba(0,0,0,0.06);
      z-index: 1000;
      border: 1px solid rgba(226,232,240,0.5);
    }
    .dock-logo {
      font-weight: 800;
      font-size: 22px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .dock-logo i {
      color: var(--accent);
      font-size: 24px;
    }
    .dock-links {
      display: flex;
      gap: 24px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .dock-links a {
      color: var(--text-main);
      font-weight: 500;
      font-size: 15px;
      padding: 6px 4px;
      transition: color var(--transition);
    }
    .dock-links a:hover {
      color: var(--primary);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
    }
    @media (max-width: 768px) {
      .dock-nav {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        transform: none;
        border-radius: 24px 24px 0 0;
        max-width: 100%;
        padding: 12px 20px;
        justify-content: space-between;
        background: rgba(255,255,255,0.96);
      }
      .dock-links {
        display: none;
        position: absolute;
        bottom: 70px;
        left: 20px;
        right: 20px;
        background: white;
        border-radius: 24px;
        flex-direction: column;
        gap: 12px;
        padding: 20px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
      }
      .dock-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
    }
    .hero-image-glow {
      box-shadow: 0 0 40px rgba(10,102,194,0.2);
      border-radius: 24px;
    }
    .card-feature {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .card-feature:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .faq-item {
      background: white;
      border-radius: 16px;
      padding: 20px 24px;
      margin-bottom: 16px;
      border: 1px solid var(--border-light);
      transition: all 0.2s;
    }
    .faq-item.active {
      border-left: 4px solid var(--primary);
      background: #F0F7FF;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
    }
    footer {
      background: #1E2A38;
      color: #CBD5E0;
      padding: 60px 0 30px;
    }
    .footer-link:hover {
      color: var(--accent);
    }
    .text-accent {
      color: var(--accent);
    }