/* roulang page: index */
:root {
      --primary: #0A6E5C;
      --primary-light: #E6F4F0;
      --primary-dark: #075A4B;
      --accent: #C8963E;
      --accent-light: #FBF3E4;
      --bg: #F5F7F6;
      --surface: #FFFFFF;
      --text-primary: #1A1F1D;
      --text-secondary: #6B7A75;
      --text-on-dark: #FFFFFF;
      --text-muted-on-dark: #B8D8D0;
      --border-light: rgba(10, 110, 92, 0.08);
      --shadow-sm: 0px 2px 12px rgba(10, 110, 92, 0.06);
      --shadow-md: 0px 6px 20px rgba(10, 110, 92, 0.10);
      --shadow-hover: 0px 12px 28px rgba(10, 110, 92, 0.12);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 40px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 28px;
      padding-right: 28px;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(10, 110, 92, 0.06);
      transition: box-shadow 0.2s ease;
    }

    .header.scrolled {
      box-shadow: 0px 4px 16px rgba(0, 0, 0, 0.02);
    }

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

    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      background: var(--primary);
      width: 28px;
      height: 28px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 600;
      font-size: 16px;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding: 8px 0;
    }

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

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

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0px 4px 12px rgba(10, 110, 92, 0.2);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0px 8px 20px rgba(10, 110, 92, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.2s;
      text-decoration: none;
      display: inline-block;
    }

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

    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      box-shadow: 0px 6px 18px rgba(0,0,0,0.08);
      transition: 0.2s;
    }

    .btn-white:hover {
      background: #f0fdf9;
      box-shadow: 0px 10px 24px rgba(0,0,0,0.12);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .mobile-toggle span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .desktop-cta {
        display: none;
      }
      .mobile-toggle {
        display: flex;
      }
    }

    /* 移动端抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      width: 80%;
      max-width: 320px;
      height: 100%;
      background: white;
      box-shadow: -8px 0 30px rgba(0,0,0,0.08);
      z-index: 200;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      padding: 28px;
      display: flex;
      flex-direction: column;
    }

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

    .drawer-links a {
      display: block;
      padding: 16px 0;
      font-size: 18px;
      font-weight: 500;
      color: var(--text-primary);
      text-decoration: none;
      border-bottom: 1px solid #f0f0f0;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #FFFFFF 0%, var(--bg) 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero h1 span {
      color: var(--primary);
    }

    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.6;
      max-width: 480px;
    }

    .hero-image {
      background: linear-gradient(135deg, #0A6E5C 0%, #075A4B 100%);
      border-radius: var(--radius-lg);
      height: 420px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }

    .hero-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: var(--radius-lg);
    }

    .stat-badge {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      border-radius: 40px;
      padding: 8px 20px;
      color: white;
      font-weight: 500;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero h1 {
        font-size: 36px;
      }
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 17px;
      margin-bottom: 48px;
    }

    /* 三列卡片 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-light);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-light);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }

    /* 数据区 */
    .stats-band {
      background: var(--primary);
      padding: 70px 0;
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }

    .stat-label {
      color: var(--text-muted-on-dark);
      font-size: 15px;
    }

    /* 交错服务 */
    .service-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .service-img {
      background: var(--primary-light);
      border-radius: var(--radius-lg);
      height: 340px;
      overflow: hidden;
    }

    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .card-grid, .stats-grid, .service-row {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      padding: 22px 24px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      margin-top: 0;
    }

    .faq-item.open .faq-answer {
      max-height: 160px;
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px solid var(--primary-light);
    }

    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA banner */
    .cta-banner {
      background: var(--primary);
      padding: 90px 0;
      text-align: center;
    }

    .cta-banner h2 {
      color: white;
      font-size: 40px;
    }

    /* Footer */
    .footer {
      background: #1A2B27;
      color: #AAB5B2;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    .footer a {
      color: #AAB5B2;
      text-decoration: none;
    }

    .footer a:hover {
      color: white;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }