/* roulang page: index */
:root {
      --primary: #FF4F1E;
      --primary-dark: #E04417;
      --primary-light: #FFF3EE;
      --secondary-dark: #1A1A2E;
      --accent-cyan: #00E5FF;
      --accent-yellow: #FFD100;
      --bg-light: #F4F6F9;
      --bg-white: #FFFFFF;
      --text-main: #1F2937;
      --text-secondary: #6B7280;
      --text-muted: #9CA3AF;
      --border-light: #E5E7EB;
      --border-input: #D1D5DB;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-xl: 20px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(255,79,30,0.15);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-main);
      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;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--text-main);
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17.5 3C15.5 3 13.8 4.2 13 6C12.2 4.2 10.5 3 8.5 3C5.5 3 3.5 5.5 4.5 8.5C5.5 11.5 12 20 12 20C12 20 18.5 11.5 19.5 8.5C20.5 5.5 18.5 3 17.5 3Z" fill="white"/></svg>') no-repeat center;
      mask-size: contain;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17.5 3C15.5 3 13.8 4.2 13 6C12.2 4.2 10.5 3 8.5 3C5.5 3 3.5 5.5 4.5 8.5C5.5 11.5 12 20 12 20C12 20 18.5 11.5 19.5 8.5C20.5 5.5 18.5 3 17.5 3Z" fill="white"/></svg>') no-repeat center;
      -webkit-mask-size: contain;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      font-size: 0.938rem;
      font-weight: 500;
      color: #4B5563;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .search-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-box {
      background: #F9FAFB;
      border: 1px solid var(--border-input);
      border-radius: 20px;
      padding: 8px 16px;
      font-size: 0.875rem;
      width: 180px;
      outline: none;
      transition: border 0.2s;
    }
    .search-box:focus {
      border-color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.938rem;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(255,79,30,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 9px 19px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background 0.2s, color 0.2s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    /* 移动端汉堡 */
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: #1F2937;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #FFFFFF 0%, #F9FAFB 100%);
      padding: 80px 0;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 380px;
      box-shadow: 0 20px 30px -10px rgba(0,0,0,0.1);
      position: relative;
      overflow: hidden;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.4) 0%, rgba(0,229,255,0.1) 100%);
    }
    .metrics-row {
      display: flex;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .metric-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 18px 20px;
      box-shadow: var(--shadow-card);
      min-width: 130px;
      flex: 1;
      text-align: center;
    }
    .metric-value {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-cyan);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 4px;
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #111827;
      letter-spacing: -0.4px;
    }
    .section-sub {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    .bg-light-gray {
      background: var(--bg-light);
    }
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .dash-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .trend-placeholder {
      width: 100%;
      height: 40px;
      background: linear-gradient(90deg, #E0F2FE 0%, #CCFBF1 100%);
      border-radius: 6px;
      position: relative;
      overflow: hidden;
    }
    .trend-line {
      width: 100%;
      height: 2px;
      background: var(--accent-cyan);
      position: absolute;
      bottom: 10px;
    }
    .arrow-up {
      color: #10B981;
      font-weight: 600;
    }
    .arrow-down {
      color: #EF4444;
      font-weight: 600;
    }
    /* 服务网格 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      border: 1px solid transparent;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .service-img {
      width: 48px;
      height: 48px;
      background: #F3F4F6;
      border-radius: 10px;
      margin-bottom: 20px;
      object-fit: cover;
    }
    .service-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 12px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 案例对比 */
    .case-layout {
      display: flex;
      gap: 40px;
      align-items: flex-start;
    }
    .case-text {
      flex: 1;
    }
    .compare-table {
      flex: 1;
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .table-row {
      display: flex;
      border-bottom: 1px solid #F3F4F6;
    }
    .table-cell {
      padding: 14px 16px;
      flex: 1;
      font-size: 0.9rem;
    }
    .highlight-row {
      background: #FFF3EE;
    }
    .icon-check {
      color: var(--accent-cyan);
      font-weight: bold;
    }
    .icon-cross {
      color: #D1D5DB;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F9FAFB;
      border-radius: 0 0 8px 8px;
      padding: 0 16px;
      color: #4B5563;
    }
    .faq-item.open .faq-answer {
      max-height: 120px;
      padding: 16px;
      margin-top: 4px;
    }
    .faq-item.open .faq-question {
      color: var(--primary);
    }
    .arrow-icon {
      transition: transform 0.2s;
    }
    .faq-item.open .arrow-icon {
      transform: rotate(180deg);
    }
    /* CTA 表单 */
    .cta-dark {
      background: #1A1A2E;
      border-radius: 24px;
      padding: 48px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      align-items: center;
      flex-wrap: wrap;
    }
    .cta-input {
      background: white;
      border: none;
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      height: 48px;
      width: 160px;
      outline: none;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag {
      background: #E5E7EB;
      color: #374151;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-right {
        min-height: 300px;
        width: 100%;
      }
      .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links, .search-cta-group {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu.open {
        display: flex;
      }
      .dashboard-grid, .services-grid {
        grid-template-columns: 1fr;
      }
      .case-layout {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cta-dark {
        flex-direction: column;
        align-items: flex-start;
      }
      .metrics-row {
        flex-direction: column;
      }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 64px;
      left: 0;
      right: 0;
      padding: 20px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      gap: 12px;
    }