/* roulang page: index */
:root {
      --primary: #00B578;
      --primary-hover: #009A5E;
      --secondary: #FF9F0A;
      --bg: #F5F6FA;
      --card-white: #FFFFFF;
      --text-main: #1F2329;
      --text-muted: #86909C;
      --error: #FA5151;
      --border-light: #E5E8EF;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
      --transition: 200ms ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      height: 64px;
      display: flex;
      align-items: center;
      backdrop-filter: blur(4px);
    }
    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 26px;
      color: var(--secondary);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-main);
      transition: color var(--transition);
      position: relative;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--text-main);
      background: transparent;
      border: none;
      padding: 8px;
    }
    /* 移动端导航面板 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      box-shadow: var(--shadow-md);
      z-index: 999;
      border-bottom: 1px solid var(--border-light);
    }
    .mobile-nav a {
      font-size: 18px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
    }
    .mobile-nav .nav-cta {
      width: fit-content;
    }
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: radial-gradient(circle at 20% 30%, rgba(0,181,120,0.06) 0%, transparent 70%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-left .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition), box-shadow var(--transition);
      height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-md);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition), color var(--transition);
      height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background: rgba(0,181,120,0.08);
    }
    .trust-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .trust-stats div {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
    }
    .trust-stats span {
      display: block;
      font-size: 14px;
      font-weight: 400;
      color: var(--text-muted);
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-img-card {
      background: rgba(0,181,120,0.05);
      border-radius: var(--radius-lg);
      padding: 12px;
      box-shadow: 0 15px 30px rgba(0,0,0,0.08);
    }
    .hero-img-card img {
      border-radius: 12px;
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 600/400;
    }
    /* 通用板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 24px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-muted);
      font-size: 16px;
    }
    /* 亮点网格 */
    .features {
      padding: 80px 0;
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-white);
      border-radius: var(--radius-md);
      padding: 32px 20px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(0,181,120,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      color: var(--primary);
      font-size: 22px;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .feature-card p {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.5;
    }
    /* 案例瀑布 */
    .cases {
      padding: 80px 0;
      background: #FFFFFF;
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: transparent;
      border-radius: 0;
      overflow: hidden;
      transition: transform var(--transition);
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      overflow: hidden;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .case-card h4 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 4px;
    }
    .case-summary {
      font-size: 14px;
      color: var(--text-muted);
      border-top: 1px solid #E5E8EF;
      padding-top: 8px;
      margin-top: 8px;
    }
    /* 方案对比 */
    .compare {
      padding: 80px 0;
    }
    .compare-table {
      display: flex;
      gap: 0;
      max-width: 800px;
      margin: 0 auto;
      background: var(--card-white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      flex: 1;
      padding: 32px;
    }
    .compare-col:first-child {
      background: #FAFBFC;
    }
    .compare-col.highlight {
      background: white;
      border-left: 3px solid var(--primary);
    }
    .compare-col h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 20px;
      font-size: 16px;
      color: var(--text-main);
    }
    .compare-item i {
      color: var(--primary);
      width: 20px;
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--card-white);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #E5E8EF;
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      gap: 16px;
    }
    .faq-question i {
      transition: transform 0.2s ease;
      color: var(--primary);
      font-size: 16px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.2s;
      font-size: 14px;
      color: var(--text-muted);
      background: #F5F6FA;
      border-radius: var(--radius-sm);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }
    /* 最终CTA */
    .final-cta {
      background: linear-gradient(135deg, #00B578 0%, #009A5E 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .final-cta h2 {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .final-cta p {
      font-size: 18px;
      margin-bottom: 32px;
      opacity: 0.9;
    }
    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      height: 48px;
      display: inline-flex;
      align-items: center;
      border: none;
    }
    .btn-white:hover {
      background: #f0f0f0;
    }
    .btn-ghost {
      background: transparent;
      color: white;
      border: 1.5px solid white;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      height: 48px;
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
    }
    /* 页脚 */
    .site-footer {
      background: #1F2329;
      color: #86909C;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-col h4 {
      color: white;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-col a {
      display: block;
      color: #86909C;
      font-size: 14px;
      margin-bottom: 12px;
      transition: color var(--transition);
    }
    .footer-col a:hover {
      color: var(--primary);
    }
    .copyright {
      border-top: 1px solid #2E3338;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
      color: #86909C;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 16px; }
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .mobile-nav.show { display: flex; }
      .hero-grid { flex-direction: column; gap: 32px; }
      .hero-left h1 { font-size: 26px; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .compare-table { flex-direction: column; }
      .compare-col.highlight { border-left: none; border-top: 3px solid var(--primary); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .trust-stats { gap: 16px; }
    }
    @media (max-width: 520px) {
      .hero-actions { flex-direction: column; width: 100%; }
      .btn-primary, .btn-outline { width: 100%; }
      .footer-grid { grid-template-columns: 1fr; }
    }