/* roulang page: index */
:root {
      --primary: #0A4C6B;
      --primary-hover: #073B54;
      --secondary: #C87A4F;
      --secondary-hover: #b0683e;
      --bg-white: #FFFFFF;
      --bg-light: #F4F8FC;
      --bg-dark: #1E2A38;
      --text-dark: #1A1A1A;
      --text-mid: #4A4A4A;
      --text-light: #8C8C8C;
      --text-on-dark: #F0F3F5;
      --border-light: #E0E6EB;
      --border-card: rgba(0,0,0,0.04);
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 0 0 1px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 20px rgba(0,0,0,0.08), 0 0 0 1px rgba(10,76,107,0.2);
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 80px;
      --radius-card: 12px;
      --radius-btn: 8px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-mid);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.3;
      color: var(--text-dark);
    }

    h1 {
      font-size: 44px;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
    }

    p {
      margin-bottom: 1.2rem;
    }

    .section-padding {
      padding: var(--spacing-section) 0;
    }

    .bg-light-alt {
      background-color: var(--bg-light);
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .navbar-custom {
      position: sticky;
      top: 0;
      z-index: 1020;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      padding: 0;
      transition: all 0.2s ease;
    }

    .navbar-top-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.6rem 0;
      border-bottom: 1px solid var(--border-light);
    }

    .brand-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .brand-icon {
      width: 24px;
      height: 24px;
      border: 2px solid var(--primary);
      transform: rotate(45deg);
      background: transparent;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1.2rem;
      color: var(--text-mid);
    }

    .nav-actions i {
      font-size: 1.1rem;
      cursor: pointer;
      transition: color 0.2s;
    }

    .nav-actions i:hover {
      color: var(--primary);
    }

    .btn-outline-primary-sm {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.35rem 1.2rem;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      transition: all 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline-primary-sm:hover {
      background: var(--primary);
      color: white;
    }

    .channel-bar {
      display: flex;
      align-items: center;
      gap: 2rem;
      padding: 0.5rem 0;
      flex-wrap: wrap;
    }

    .channel-link {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-mid);
      text-decoration: none;
      padding: 0.25rem 0;
      position: relative;
      transition: color 0.2s;
    }

    .channel-link:hover {
      color: var(--primary);
      text-decoration: underline;
      text-underline-offset: 6px;
      text-decoration-thickness: 2px;
    }

    .navbar-toggler-custom {
      border: none;
      background: transparent;
      color: var(--primary);
      font-size: 1.5rem;
      padding: 0.25rem;
    }

    @media (max-width: 992px) {
      .channel-bar {
        display: none;
      }
      .navbar-top-row {
        border-bottom: none;
      }
      .mobile-menu-open .channel-bar {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
        padding: 1rem 0;
        background: white;
        width: 100%;
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #f8fafd 0%, #ffffff 100%);
      padding: 3rem 0 5rem;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-text {
      flex: 1;
    }

    .hero-image {
      flex: 1;
      text-align: center;
    }

    .hero-image img {
      max-width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-card);
    }

    .kpi-row {
      display: flex;
      gap: 1.5rem;
      margin-top: 2.5rem;
    }

    .kpi-card {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(4px);
      border-radius: 12px;
      padding: 1rem 1.5rem;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      border: 1px solid var(--border-light);
      flex: 1;
    }

    .kpi-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      font-feature-settings: "tnum";
    }

    .kpi-label {
      font-size: 0.9rem;
      color: var(--text-mid);
    }

    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary-custom:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(10,76,107,0.2);
      color: white;
    }

    .btn-secondary-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      text-decoration: none;
      display: inline-block;
      margin-left: 1rem;
    }

    .btn-secondary-custom:hover {
      background: rgba(10,76,107,0.08);
      color: var(--primary);
    }

    .btn-cta {
      background: var(--secondary);
      border: none;
      color: white;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }

    .btn-cta:hover {
      background: var(--secondary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(200,122,79,0.25);
      color: white;
    }

    /* 卡片样式 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      border: 1px solid transparent;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .service-icon {
      width: 40px;
      height: 40px;
      margin-bottom: 1rem;
    }

    .service-number {
      font-size: 2rem;
      font-weight: 300;
      color: var(--primary);
      line-height: 1;
    }

    .comparison-bar {
      background: var(--primary);
      color: white;
      padding: 1.2rem 2rem;
      border-radius: 12px;
      margin-bottom: 2rem;
      font-weight: 600;
      font-size: 1.3rem;
    }

    .compare-item {
      display: flex;
      align-items: center;
      padding: 0.8rem 0;
      border-bottom: 1px solid var(--border-light);
    }

    .compare-left {
      flex: 1;
      font-weight: 600;
      color: var(--primary);
    }

    .compare-right {
      flex: 1;
      color: var(--text-light);
      text-align: right;
    }

    .divider-line {
      width: 1px;
      background: var(--border-light);
      margin: 0 1.5rem;
      height: 20px;
    }

    .accordion-custom .accordion-button {
      background: white;
      font-weight: 600;
      box-shadow: none;
      border-radius: 8px !important;
      padding: 1.2rem 1.5rem;
      color: var(--text-dark);
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      background: white;
      color: var(--primary);
      border-left: 4px solid var(--primary);
      box-shadow: none;
    }

    .accordion-custom .accordion-body {
      background: #FAFBFD;
      padding: 1.5rem;
      color: var(--text-mid);
      line-height: 1.8;
    }

    .footer-dark {
      background: var(--bg-dark);
      color: var(--text-on-dark);
      padding: 3rem 0 1.5rem;
    }

    .footer-dark a {
      color: #b0c4d9;
      text-decoration: none;
    }

    .footer-dark a:hover {
      color: var(--secondary);
    }

    .social-icon-circle {
      width: 36px;
      height: 36px;
      background: rgba(255,255,255,0.15);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 0.5rem;
      transition: 0.2s;
    }

    .social-icon-circle:hover {
      background: var(--primary);
      color: white;
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .hero-grid { flex-direction: column; }
      .kpi-row { flex-direction: column; }
      .section-padding { padding: 48px 0; }
      .btn-secondary-custom { margin-left: 0; margin-top: 0.8rem; }
      .compare-item { flex-direction: column; align-items: flex-start; }
      .divider-line { display: none; }
    }