/* roulang page: index */
:root {
      --primary: #0A2540;
      --secondary: #00C49A;
      --accent: #FF6B35;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-primary: #0A2540;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(10, 37, 64, 0.06);
      --shadow-md: 0 8px 24px rgba(10, 37, 64, 0.12);
      --transition: 0.2s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 700;
      line-height: 1.2;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      color: #1E293B;
    }
    h4 {
      font-size: 20px;
      font-weight: 600;
      color: #1E293B;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
      border-radius: var(--radius-md);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      border: none;
      transition: all var(--transition);
    }
    .section {
      padding: 100px 0;
    }
    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      height: var(--header-height);
      border-bottom: 1px solid rgba(10, 37, 64, 0.05);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--secondary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
      font-size: 15px;
      white-space: nowrap;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--secondary);
      font-weight: 600;
    }
    .btn-primary {
      background: var(--secondary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 10px rgba(0, 196, 154, 0.3);
    }
    .btn-primary:hover {
      filter: brightness(0.9);
      box-shadow: 0 6px 14px rgba(0, 196, 154, 0.4);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      box-shadow: 0 4px 10px rgba(255, 107, 53, 0.3);
    }
    .btn-accent:hover {
      filter: brightness(0.9);
    }
    /* 汉堡菜单 */
    #menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-md);
        border-radius: 0 0 16px 16px;
      }
      .nav-links.show {
        display: flex;
      }
      #menu-toggle {
        display: block;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #f8fafc 0%, #eef2f6 100%);
      padding: 80px 0 100px;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      position: relative;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-image {
        min-height: 260px;
      }
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 56px;
      height: 56px;
      background: rgba(0, 196, 154, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--secondary);
      font-size: 28px;
    }
    /* 场景交替 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }
    .scenario-img {
      background: #e9eef3;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .tag {
      display: inline-block;
      background: rgba(0, 196, 154, 0.15);
      color: #0A2540;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--secondary);
    }
    .case-stat {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 8px;
    }
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .pricing-card {
      background: white;
      padding: 36px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .pricing-card.featured {
      border: 2px solid var(--secondary);
      transform: scale(1.02);
      box-shadow: var(--shadow-md);
    }
    .price {
      font-size: 44px;
      font-weight: 700;
      color: var(--primary);
      margin: 16px 0;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      padding: 0 20px;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 18px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 18px;
    }
    .contact-section {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 12px;
      border-radius: 6px;
      border: none;
      margin-bottom: 16px;
      font-family: inherit;
    }
    .footer {
      background: #0A2540;
      color: #CBD5E1;
      padding: 40px 0;
    }
    @media (max-width: 768px) {
      .grid-3, .pricing-grid, .case-grid, .contact-section {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        grid-template-columns: 1fr;
        gap: 30px;
      }
    }