/* roulang page: index */
:root {
      --primary-deep: #0A1F3F;
      --primary-gradient: linear-gradient(135deg, #0A1F3F 0%, #1A3A5C 100%);
      --accent: #FF4D2E;
      --accent-hover: #E03A1C;
      --bg-light: #F5F7FA;
      --card-white: #FFFFFF;
      --text-dark: #1E2A38;
      --text-gray: #4A5568;
      --text-light: #CBD5E0;
      --border-light: #E2E8F0;
      --success-green: #00C48C;
      --shadow-sm: 0 4px 24px rgba(10, 31, 63, 0.06);
      --shadow-hover: 0 12px 32px rgba(10, 31, 63, 0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-badge: 12px;
      --font-sans: 'Inter', 'SF Pro Display', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --max-width: 1280px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-gray);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-gray);
      font-size: 15px;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--primary-deep);
    }

    .btn-primary-sm {
      background: var(--accent);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 14px;
      transition: background 0.2s, box-shadow 0.2s;
    }

    .btn-primary-sm:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 18px rgba(255, 77, 46, 0.25);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary-deep);
    }

    /* 移动端导航菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      padding: 24px;
      box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      flex-direction: column;
      gap: 20px;
      z-index: 49;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-dark);
    }

    .hero-section {
      background: var(--primary-gradient);
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
      margin-top: 72px;
      color: white;
    }

    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><path d="M0 400 Q150 300 300 400 T600 350 T900 420 T1200 380 L1200 600 L0 600 Z" fill="rgba(255,255,255,0.04)"/></svg>');
      background-size: cover;
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      color: white;
    }

    .hero-text p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      transition: background 0.2s, box-shadow 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 12px 24px rgba(255, 77, 46, 0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }

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

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

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      max-width: 100%;
    }

    .trust-badges-mini {
      display: flex;
      gap: 24px;
      margin-top: 32px;
      color: rgba(255,255,255,0.7);
      font-size: 14px;
    }

    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-gray);
      margin-bottom: 48px;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-badge);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .stat-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent);
      margin: 8px 0;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      width: 64px;
      height: 64px;
      background: #F0F4FA;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-deep);
      font-size: 28px;
    }

    .flow-steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .step-number {
      width: 48px;
      height: 48px;
      background: var(--primary-gradient);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 700;
    }

    .compare-table {
      overflow-x: auto;
      border-radius: var(--radius-card);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      background: white;
    }

    th {
      background: var(--primary-gradient);
      color: white;
      padding: 16px;
    }

    td, th {
      padding: 14px 20px;
      border-bottom: 1px solid var(--border-light);
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-gray);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .cta-section {
      background: var(--primary-gradient);
      color: white;
      text-align: center;
    }

    .footer {
      background: #1A202C;
      color: var(--text-light);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-grid { flex-direction: column; }
      .hero-image { text-align: center; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .services-grid, .stats-grid { grid-template-columns: 1fr; }
      .flow-steps { flex-direction: column; gap: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
    }