/* roulang page: index */
:root {
      --primary-deep: #1E1E1E;
      --primary-orange: #F15A24;
      --orange-hover: #D94A1E;
      --soft-green-bg: #EAF0EB;
      --muted-gold: #C9A96E;
      --bg-light: #F9F9FB;
      --text-dark: #1E1E1E;
      --text-soft: #5A5A5A;
      --text-muted: #8A8A8A;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-glow: 0 6px 20px rgba(241,90,36,0.12);
      --radius-card: 12px;
      --radius-btn: 24px;
      --radius-dock: 32px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }

    /* 浮动Dock导航 */
    .dock-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 92%;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
      box-shadow: 0 8px 28px rgba(0,0,0,0.06);
      z-index: 50;
      border: 1px solid rgba(255,255,255,0.5);
    }

    .dock-logo {
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: -0.3px;
      color: var(--primary-deep);
      white-space: nowrap;
    }
    .dock-logo span {
      color: var(--primary-orange);
      font-weight: 800;
    }

    .dock-links {
      display: flex;
      gap: 24px;
      align-items: center;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--primary-deep);
    }

    .dock-links a {
      padding: 4px 2px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .dock-links a:hover {
      color: var(--primary-orange);
      border-bottom-color: var(--primary-orange);
    }

    .btn-primary-sm {
      background: var(--primary-orange);
      color: white;
      border: none;
      padding: 8px 18px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(241,90,36,0.2);
      white-space: nowrap;
    }
    .btn-primary-sm:hover {
      background: var(--orange-hover);
      box-shadow: 0 6px 16px rgba(241,90,36,0.3);
    }

    /* 英雄区 */
    .hero-section {
      background: linear-gradient(135deg, #1E1E1E 0%, #2C2C2C 100%);
      padding: 140px 0 80px;
      color: white;
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-orange);
      line-height: 1.2;
    }

    .trust-badge {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border: 1px solid var(--muted-gold);
      color: var(--muted-gold);
      border-radius: 16px;
      padding: 8px 18px;
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 8px 18px rgba(0,0,0,0.2);
    }

    /* 亮点网格不规则 */
    .highlight-grid {
      display: grid;
      grid-template-columns: 1fr 1.3fr 0.9fr;
      gap: 24px;
    }

    .highlight-card {
      background: var(--soft-green-bg);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      transition: transform 0.2s;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
    }

    /* 案例瀑布流 */
    .case-waterfall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.25s, transform 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .case-card:hover img {
      transform: scale(1.04);
    }
    .case-img {
      transition: transform 0.4s ease;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    /* 方案对比 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border: 1px solid var(--border-light);
      border-radius: 0;
    }
    .compare-left {
      background: #FAFAFA;
      padding: 28px 24px;
    }
    .compare-right {
      background: #F4F9F4;
      padding: 28px 24px;
      border-left: 1px solid var(--border-light);
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #F7F7F9;
      border-radius: 8px;
      margin-bottom: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* 底部CTA */
    .cta-banner {
      background: var(--primary-deep);
    }

    footer a:hover {
      color: var(--primary-orange);
    }

    @media (max-width: 768px) {
      .dock-nav {
        padding: 8px 16px;
        gap: 12px;
        border-radius: 28px;
        top: 10px;
      }
      .dock-links {
        display: none;
      }
      .highlight-grid {
        grid-template-columns: 1fr;
      }
      .case-waterfall {
        grid-template-columns: 1fr;
      }
      .compare-table {
        grid-template-columns: 1fr;
      }
      .compare-right {
        border-left: none;
        border-top: 1px solid var(--border-light);
      }
      .hero-section {
        padding: 120px 0 60px;
      }
    }

    @media (max-width: 520px) {
      .dock-logo {
        font-size: 1.1rem;
      }
    }