/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #154E63;
      --secondary: #0EA5A0;
      --accent: #F59E0B;
      --accent-dark: #D97706;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-primary: #1E293B;
      --text-secondary: #475569;
      --text-muted: #64748B;
      --text-placeholder: #94A3B8;
      --border: #E2E8F0;
      --success: #10B981;
      --danger: #EF4444;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
      --border-radius-card: 12px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 10px 25px rgba(26,95,122,0.12), 0 4px 10px rgba(0,0,0,0.05);
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      margin: 0;
      padding: 0;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 自定义按钮覆盖Bootstrap */
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      border-radius: 8px;
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(26,95,122,0.3);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: 8px;
      padding: 10px 24px;
      font-weight: 500;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary);
      color: white;
    }
    .btn-accent {
      background-color: var(--accent);
      border: none;
      color: #1E293B;
      font-weight: 600;
      border-radius: 8px;
      padding: 10px 22px;
      transition: var(--transition);
    }
    .btn-accent:hover {
      background-color: var(--accent-dark);
      color: #1E293B;
    }
    /* 导航栏 */
    .navbar-custom {
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      padding: 0 20px;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary) !important;
      letter-spacing: -0.3px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary) !important;
      margin: 0 6px;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
      border-bottom: 2px solid var(--primary);
    }
    .search-box {
      background: #F1F5F9;
      border-radius: 20px;
      padding: 6px 16px;
      border: none;
      width: 200px;
    }
    .search-icon {
      color: var(--text-muted);
      cursor: pointer;
      font-size: 1.2rem;
      margin-right: 12px;
    }
    .navbar-toggler {
      border: none;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    /* Hero */
    #hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: white;
      padding: 40px 0;
    }
    .hero-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-primary);
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin: 20px 0 30px;
    }
    .metrics .metric-item h3 {
      font-size: 42px;
      font-weight: 700;
      color: var(--secondary);
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    /* 区块标题 */
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 12px;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin-top: 8px;
      border-radius: 2px;
    }
    /* 卡片通用 */
    .card-custom {
      background: var(--card-bg);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
      border: none;
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border: 1px solid var(--primary);
    }
    .data-card {
      padding: 24px;
      background: white;
      border-radius: 12px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      text-align: center;
    }
    .trend-up { color: var(--success); }
    .trend-down { color: var(--danger); }
    /* 服务卡片图标 */
    .service-icon {
      width: 64px;
      height: 64px;
      background: #EFF6FF;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    /* 对比区块 */
    .compare-left {
      background: #FEF2F2;
      border-radius: 12px;
    }
    .compare-right {
      background: #F0FDF4;
      border-radius: 12px;
    }
    .logo-placeholder {
      width: 80px;
      height: 40px;
      background: #E2E8F0;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      font-size: 12px;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--border);
    }
    .accordion-item {
      border: none;
      margin-bottom: 8px;
      border-radius: 8px !important;
      box-shadow: 0 1px 2px rgba(0,0,0,0.02);
    }
    .accordion-button {
      font-weight: 500;
      background: white;
    }
    /* CTA表单 */
    .cta-section {
      background: #F0F9FA;
      border-radius: 16px;
      padding: 48px;
    }
    .form-control {
      border: 1px solid #CBD5E1;
      border-radius: 8px;
      padding: 12px 16px;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,122,0.1);
    }
    .trust-icon i {
      color: var(--success);
      margin-right: 8px;
    }
    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer a {
      color: #94A3B8;
      transition: var(--transition);
    }
    .footer a:hover {
      color: white;
    }
    .social-circle {
      width: 36px;
      height: 36px;
      background: #334155;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
    }
    .social-circle:hover {
      background: var(--primary);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 30px;
      }
      .cta-section {
        padding: 28px;
      }
    }