/* roulang page: index */
:root {
      --primary: #0A66C2;
      --primary-deep: #084e94;
      --accent: #F5A623;
      --accent-hover: #e09510;
      --bg-light: #F8FAFC;
      --white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-light: #e2e8f0;
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-pill: 40px;
      --shadow-card: 0px 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0px 8px 30px rgba(0,0,0,0.08);
      --shadow-dock: 0px 2px 12px rgba(0,0,0,0.06);
      --font-sans: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition-fast: 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-fast);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all var(--transition-fast);
      border: none;
      background: transparent;
    }

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 浮动Dock导航 */
    .dock-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 1200px;
      height: 60px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-pill);
      box-shadow: var(--shadow-dock);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px 0 28px;
      z-index: 50;
      transition: all 0.25s;
      border: 1px solid rgba(255,255,255,0.5);
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: -0.02em;
      color: var(--primary);
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo-text i {
      color: var(--accent);
      font-size: 1.5rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      color: var(--text-main);
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }

    .btn-dock-cta {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(245,166,35,0.25);
      white-space: nowrap;
    }
    .btn-dock-cta:hover {
      background: var(--accent-hover);
    }

    .mobile-menu-btn {
      display: none;
      font-size: 1.6rem;
      color: var(--text-main);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--primary-deep);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: rgba(10,102,194,0.05);
    }

    .btn-large-cta {
      background: var(--accent);
      color: white;
      border-radius: 16px;
      padding: 18px 40px;
      font-weight: 700;
      font-size: 1.2rem;
      box-shadow: 0 10px 25px rgba(245,166,35,0.3);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-large-cta:hover {
      background: var(--accent-hover);
    }

    /* 卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #f1f5f9;
      border-radius: 8px;
      margin-bottom: 12px;
    }
    .faq-answer.open {
      max-height: 200px;
    }
    .faq-answer p {
      padding: 16px;
      margin: 0;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .dock-nav {
        padding: 0 16px;
        height: 56px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .btn-dock-cta {
        padding: 8px 18px;
        font-size: 0.8rem;
      }
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }