/* roulang page: index */
:root {
      --primary: #0A2E5C;
      --primary-deep: #061E3A;
      --accent1: #00B4A6;
      --accent1-hover: #009B8F;
      --accent2: #F5A623;
      --accent2-hover: #E09510;
      --bg-light: #F7F9FC;
      --white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-footer: #B0C4DE;
      --border-light: #E9ECF2;
      --shadow-sm: 0 4px 20px rgba(10, 46, 92, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 46, 92, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --font-system: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-system);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 容器覆盖 */
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航品牌行 */
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand-custom i {
      color: var(--accent1);
      font-size: 2rem;
    }
    .top-bar {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(4px);
      border-bottom: 1px solid rgba(10,46,92,0.05);
      padding: 8px 0;
      transition: var(--transition);
    }
    .nav-channel {
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .nav-channel .nav-link {
      color: var(--text-main);
      font-weight: 500;
      margin: 0 4px;
      padding: 10px 16px;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    .nav-channel .nav-link.active,
    .nav-channel .nav-link:hover {
      color: var(--primary);
      border-bottom-color: var(--accent1);
    }
    .search-icon {
      color: var(--text-muted);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
    }
    .search-icon:hover {
      color: var(--accent1);
    }
    .hot-tag {
      background: var(--bg-light);
      color: var(--primary);
      border-radius: 20px;
      padding: 5px 14px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 吸顶效果 */
    .sticky-header {
      position: sticky;
      top: 0;
      z-index: 1020;
      background: var(--white);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    /* 汉堡菜单定制 */
    .navbar-toggler {
      border: none;
      color: var(--primary);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    .offcanvas {
      background: var(--white);
    }
    .offcanvas .nav-link {
      color: var(--primary);
      font-weight: 600;
      padding: 12px 20px;
      border-bottom: 1px solid var(--border-light);
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
      color: white;
      padding: 60px 0 70px;
      position: relative;
      overflow: hidden;
    }
    .hero-title {
      font-size: 34px;
      font-weight: 700;
      line-height: 1.3;
      color: white;
    }
    .hero-sub {
      font-size: 1.1rem;
      opacity: 0.9;
      margin: 20px 0 28px;
    }
    .btn-primary-custom {
      background: var(--accent1);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background: var(--accent1-hover);
      color: white;
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }
    .btn-cta {
      background: var(--accent2);
      border: none;
      color: white;
      font-weight: 700;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-cta:hover {
      background: var(--accent2-hover);
      color: white;
    }
    .hero-badge {
      background: rgba(255,255,255,0.95);
      color: var(--text-main);
      border-radius: 12px;
      padding: 12px 16px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    .hero-badge .number {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent1);
      line-height: 1.2;
    }
    /* 指标看板 */
    .metric-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 24px 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }
    .metric-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent1);
    }
    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent1);
      margin-bottom: 18px;
      transition: transform 0.2s;
    }
    .service-card:hover .service-icon {
      transform: scale(1.08);
    }
    /* 对比卡片 */
    .compare-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.highlight {
      border: 2px solid var(--accent1);
      background: #f0fdfa;
    }
    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: var(--white);
      color: var(--primary);
      box-shadow: none;
      border-radius: var(--radius-card) !important;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      background: var(--white);
      color: var(--primary);
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--accent1);
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    /* 表单 */
    .form-control {
      border-radius: var(--radius-btn);
      border: 1px solid var(--border-light);
      padding: 12px 16px;
    }
    .form-control:focus {
      border-color: var(--accent1);
      box-shadow: 0 0 0 0.15rem rgba(0,180,166,0.2);
    }
    .cta-form-wrapper {
      background: rgba(10,46,92,0.04);
      border-radius: 20px;
      padding: 36px 30px;
    }
    .footer {
      background: var(--primary);
      color: var(--text-footer);
      padding: 50px 0 20px;
    }
    .footer a {
      color: var(--text-footer);
    }
    .footer a:hover {
      color: white;
    }
    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 26px;
      }
      .metric-card {
        margin-bottom: 15px;
      }
      .service-card {
        margin-bottom: 20px;
      }
    }