/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #0F3B4B;
      --accent: #E85D04;
      --bg: #F5F8FA;
      --text: #1E293B;
      --text-secondary: #475569;
      --text-muted: #94A3B8;
      --card-bg: #FFFFFF;
      --card-shadow: 0 1px 3px rgba(15,59,75,0.06), 0 1px 2px rgba(15,59,75,0.04);
      --card-shadow-hover: 0 8px 25px rgba(15,59,75,0.10);
      --radius: 12px;
      --transition: 0.25s ease;
      --border: #E2E8F0;
      --success: #10B981;
      --danger: #EF4444;
      --white: #FFFFFF;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }

    /* 导航分屏联动 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      height: 80px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }

    .nav-cta {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: 8px;
      font-weight: 600;
      margin-left: 8px;
      box-shadow: 0 2px 6px rgba(232,93,4,0.25);
    }
    .nav-cta:hover {
      background: #D35400;
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text);
      transition: var(--transition);
    }

    /* Hero 左文右图 */
    .hero {
      display: flex;
      align-items: center;
      min-height: calc(100vh - 80px);
      background: linear-gradient(90deg, var(--bg) 50%, rgba(26,95,122,0.08) 50%);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      flex: 1;
      padding-right: 40px;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero h1 span {
      color: var(--accent);
      position: relative;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(232,93,4,0.3);
    }
    .btn-primary:hover {
      background: #D35400;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(232,93,4,0.35);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
      border-radius: 8px;
      background: transparent;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(26,95,122,0.08);
    }
    .hero-visual {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 500px;
      border-radius: 24px;
      box-shadow: var(--card-shadow-hover);
      position: relative;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,95,122,0.25), rgba(15,59,75,0.1));
      border-radius: 24px;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }

    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(26,95,122,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 28px;
      color: var(--primary);
    }

    /* 功能卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .product-card {
      display: flex;
      gap: 20px;
      background: var(--card-bg);
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border);
    }
    .product-img {
      width: 100px;
      height: 100px;
      background: #E2E8F0;
      border-radius: 12px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
    }

    /* 场景卡片 */
    .scenario-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border);
    }
    .scenario-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    /* 案例 */
    .case-highlight {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border);
      text-align: center;
    }
    .pricing-card.popular {
      border: 2px solid var(--primary);
      transform: scale(1.02);
    }
    .price {
      font-family: 'DIN Alternate', 'SF Mono', monospace;
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      color: var(--text);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFC;
      padding: 0 16px;
    }

    .cta-final {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
      border-radius: 24px;
      margin: 60px 0;
    }
    .footer {
      background: var(--primary-dark);
      color: white;
      padding: 60px 0 30px;
    }
    .footer a {
      color: #CBD5E1;
    }
    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 24px;
      }
      .grid-3, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .product-grid {
        grid-template-columns: 1fr;
      }
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .hero-content {
        padding-right: 0;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }