/* roulang page: index */
:root {
      --primary: #0A4D3C;
      --primary-hover: #073B2E;
      --accent: #F5A623;
      --accent-light: #FDE68A;
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --text-main: #111827;
      --text-secondary: #6B7280;
      --border: #E5E7EB;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition: 0.2s ease;
      --header-height: 72px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
      z-index: 50;
      height: var(--header-height);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.3px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent);
      font-weight: 800;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }

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

    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-nav:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--primary);
      border-radius: 4px;
      transition: 0.2s;
    }

    /* 移动端导航抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--primary);
      z-index: 100;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 32px;
      transition: right 0.3s ease;
      box-shadow: -8px 0 20px rgba(0,0,0,0.15);
    }
    .mobile-drawer.open {
      right: 0;
    }
    .drawer-close {
      align-self: flex-end;
      background: transparent;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }
    .mobile-drawer a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 10px;
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      position: relative;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 24px;
      transition: box-shadow 0.25s, transform 0.25s;
      border: 1px solid var(--border);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: var(--primary);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), transform var(--transition);
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      color: #1e1e1e;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
    }
    .btn-accent:hover {
      background: #e5940f;
      transform: scale(1.03);
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
    }
    .data-badge-float {
      position: absolute;
      bottom: 20px;
      right: 20px;
      background: white;
      border-radius: 30px;
      padding: 8px 20px;
      font-weight: 600;
      color: var(--primary);
      box-shadow: 0 6px 14px rgba(0,0,0,0.1);
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    /* 亮点网格 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    /* 卡片瀑布 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .service-card img {
      border-radius: 12px 12px 0 0;
      height: 200px;
      object-fit: cover;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .compare-card {
      background: white;
      border-radius: 20px;
      padding: 28px 20px;
      border: 1px solid var(--border);
      text-align: center;
    }
    .compare-card.recommended {
      border-top: 4px solid var(--accent);
      background: #f4fcf9;
    }

    /* 数据信任 */
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding-left: 28px;
      color: var(--text-secondary);
    }
    .faq-answer.open {
      max-height: 200px;
    }
    .indicator {
      width: 4px;
      height: 20px;
      background: var(--primary);
      border-radius: 4px;
    }

    /* 最终CTA */
    .cta-band {
      background: radial-gradient(circle at 20% 20%, #0c5e4a, #04241c);
      border-radius: 32px;
      padding: 60px 40px;
      text-align: center;
      color: white;
    }

    .footer-links {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .feature-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .service-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .feature-grid,
      .service-grid,
      .trust-grid {
        grid-template-columns: 1fr;
      }
      .compare-table {
        grid-template-columns: 1fr;
        overflow-x: auto;
        display: flex;
        gap: 16px;
        padding-bottom: 12px;
      }
      .compare-card {
        min-width: 260px;
      }
      .footer-links {
        grid-template-columns: repeat(2, 1fr);
      }
      .section {
        padding: 60px 0;
      }
    }