/* roulang page: index */
/* 基础重置与设计变量 */
    *, *::before, *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary: #1A5FDC;
      --primary-hover: #0F3D8C;
      --accent: #10B981;
      --bg-white: #FFFFFF;
      --bg-light: #F7F9FC;
      --bg-warm: #FAFAFA;
      --card-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.05);
      --text-dark: #0B1E3D;
      --text-body: #4A5568;
      --text-muted: #718096;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-indicator: 6px;
      --radius-faq: 4px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
      --transition: 0.2s ease;
      --container-max: 1200px;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 16px;
    }

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

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

    .nav-links a {
      color: var(--text-body);
      font-weight: 400;
      font-size: 15px;
      transition: color var(--transition);
      position: relative;
      padding: 4px 0;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 14px;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 14px;
      cursor: pointer;
      transition: background var(--transition), color var(--transition);
      display: inline-block;
      text-align: center;
      white-space: nowrap;
    }

    .btn-outline:hover {
      background: #EBF2FD;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background var(--transition);
      display: inline-block;
    }

    .btn-white:hover {
      background: #F0F4FA;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }

    .menu-toggle span {
      width: 100%;
      height: 2px;
      background: var(--text-dark);
      transition: var(--transition);
      display: block;
      border-radius: 2px;
    }

    /* 移动端导航面板 */
    .mobile-panel {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      z-index: 999;
    }

    .mobile-panel a {
      font-size: 16px;
      color: var(--text-body);
      font-weight: 500;
    }

    /* Hero */
    .hero-section {
      padding: 160px 0 120px;
      background: linear-gradient(180deg, #F4F7FC 0%, #FFFFFF 100%);
      margin-top: 64px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 1;
    }

    .hero-content h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 20px;
    }

    .hero-highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-body);
      max-width: 600px;
      margin-bottom: 32px;
      line-height: 1.6;
    }

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

    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-image img {
      max-width: 100%;
      border-radius: 16px;
      box-shadow: var(--card-hover-shadow);
    }

    /* 区块通用 */
    .section {
      padding: 120px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 60px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--bg-white);
      border-radius: var(--radius-indicator);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      border-top: 4px solid var(--primary);
      transition: var(--transition);
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 8px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

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

    .service-card {
      background: var(--bg-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: transform var(--transition), box-shadow var(--transition);
    }

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

    .service-icon {
      font-size: 40px;
      color: var(--text-muted);
      margin-bottom: 20px;
      transition: color var(--transition);
    }

    .service-card:hover .service-icon {
      color: var(--primary);
    }

    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: #1A1A1A;
      margin-bottom: 12px;
    }

    .service-desc {
      color: var(--text-body);
      margin-bottom: 20px;
      font-size: 15px;
      line-height: 1.5;
    }

    .text-link {
      color: var(--primary);
      font-weight: 500;
      transition: opacity var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .text-link:hover {
      opacity: 0.8;
    }

    /* 对比区块 */
    .compare-wrapper {
      display: flex;
      gap: 40px;
      align-items: center;
      background: var(--bg-warm);
      border-radius: 24px;
      padding: 48px;
    }

    .compare-col {
      flex: 1;
    }

    .compare-col h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .compare-list {
      list-style: none;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }

    .icon-negative {
      color: #E53E3E;
      background: #FFF5F5;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .icon-positive {
      color: var(--accent);
      background: #ECFDF5;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .compare-divider {
      width: 1px;
      background: var(--border-light);
      height: 200px;
    }

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

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      cursor: pointer;
      font-weight: 500;
      color: #1A1A1A;
      font-size: 18px;
    }

    .faq-question span:first-child {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .faq-q-badge {
      font-weight: 700;
      color: var(--primary);
    }

    .faq-arrow {
      transition: transform 0.2s;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-body);
      padding: 0 0 0 32px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(155deg, #1A5FDC 0%, #0F3D8C 100%);
      padding: 100px 0;
      text-align: center;
      color: white;
    }

    .cta-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .cta-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }

    .cta-note {
      font-size: 14px;
      opacity: 0.7;
      margin-top: 16px;
    }

    /* 页脚 */
    .site-footer {
      background: #0B1E3D;
      color: #CBD5E0;
      padding: 60px 0 30px;
    }

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

    .footer-brand p {
      margin-top: 12px;
      font-size: 14px;
    }

    .footer-col h4 {
      color: white;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .footer-col a {
      display: block;
      color: #94A3B8;
      margin-bottom: 12px;
      transition: color var(--transition);
    }

    .footer-col a:hover {
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid #2D3748;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: #64748B;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 36px;
      }
      .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .compare-wrapper {
        flex-direction: column;
        padding: 32px;
      }
      .compare-divider {
        width: 100%;
        height: 1px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: flex;
      }
      .mobile-panel.active {
        display: flex;
      }
      .section {
        padding: 80px 0;
      }
      .section-title {
        font-size: 28px;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .metrics-grid {
        grid-template-columns: 1fr 1fr;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .container {
        padding: 0 16px;
      }
    }