/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-soft: #EFF6FF;
      --accent: #FF5C00;
      --accent-hover: #E04E00;
      --bg: #F8FAFC;
      --surface: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --text-muted: #94A3B8;
      --border: #E2E8F0;
      --success: #10B981;
      --shadow-sm: 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(10,110,255,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-container: 16px;
      --font-sans: 'Inter', '阿里巴巴普惠体', '思源黑体', system-ui, -apple-system, sans-serif;
      --transition: 0.2s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 分屏导航布局 */
    .split-layout {
      display: flex;
      min-height: 100vh;
    }

    .split-nav {
      width: 280px;
      background: var(--surface);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      padding: 40px 24px;
      border-right: 1px solid var(--border);
      position: fixed;
      top: 0;
      bottom: 0;
      left: 0;
      z-index: 50;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      margin-bottom: 48px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      font-size: 32px;
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
      width: 100%;
    }

    .nav-link {
      display: block;
      padding: 10px 20px;
      border-radius: 8px;
      font-weight: 500;
      color: var(--text-secondary);
      transition: all var(--transition);
      border-left: 3px solid transparent;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--primary);
      background: var(--primary-soft);
      border-left-color: var(--primary);
    }

    .split-hero-area {
      margin-left: 280px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    /* 汉堡菜单 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: var(--surface);
      border-bottom: 1px solid var(--border);
      padding: 12px 20px;
      z-index: 60;
      align-items: center;
      justify-content: space-between;
    }

    .hamburger {
      font-size: 24px;
      color: var(--text);
    }

    .mobile-nav-panel {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: var(--surface);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 24px;
      z-index: 70;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
    }

    .mobile-nav-panel.open {
      transform: translateX(0);
    }

    .close-nav {
      position: absolute;
      top: 20px;
      right: 20px;
      font-size: 28px;
    }

    /* Hero */
    .hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      min-height: 100vh;
      color: white;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,110,255,0.7) 0%, rgba(0,0,0,0.3) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 20px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    .hero-sub {
      font-size: 18px;
      margin-bottom: 32px;
      opacity: 0.95;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
    }

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

    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 24px;
      animation: bounce 2s infinite;
      color: white;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
      40% { transform: translateY(-8px) translateX(-50%); }
      60% { transform: translateY(-4px) translateX(-50%); }
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text);
    }

    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-stat {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .feature-stat:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 12px;
    }

    .feature-stat h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }

    .feature-stat p {
      color: var(--text-secondary);
    }

    /* 案例瀑布流 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-body {
      padding: 24px;
    }

    .case-tag {
      display: inline-block;
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .case-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .case-summary {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 方案对比表 */
    .table-wrapper {
      overflow-x: auto;
      border-radius: var(--radius-card);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
    }

    .plan-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }

    .plan-table th {
      background: #EFF6FF;
      padding: 20px;
      font-weight: 600;
      text-align: left;
      color: var(--text);
    }

    .plan-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      color: var(--text-secondary);
    }

    .highlight-col {
      background: #F0F9FF;
      border-left: 4px solid var(--primary);
    }

    .price {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      transition: color var(--transition);
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A1E3F, #0A2E5F);
      color: white;
      padding: 80px 0;
      text-align: center;
      border-radius: var(--radius-container);
      margin: 0 32px;
    }

    .cta-banner h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }

    .cta-banner .btn-secondary {
      border-color: white;
      color: white;
      margin-left: 16px;
    }

    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    .footer a {
      color: #CBD5E1;
      transition: color var(--transition);
    }

    .footer a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid #334155;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: #94A3B8;
    }

    @media (max-width: 1024px) {
      .split-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .split-hero-area {
        margin-left: 0;
        padding-top: 60px;
      }
      .features-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .features-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .btn-group {
        flex-direction: column;
        align-items: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      section {
        padding: 60px 0;
      }
    }