/* roulang page: index */
:root {
      --primary: #0F3D3E;
      --accent: #C49B4C;
      --surface: #FAFAF8;
      --card: #FFFFFF;
      --altcard: #F4F4F0;
      --deep: #2C2C2C;
      --muted: #6B6B6B;
      --border: #E8E8E0;
      --success: #1B6B5A;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -2px rgba(0,0,0,0.05);
      --radius-xl: 16px;
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-pill: 20px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--surface);
      color: var(--deep);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    @media (min-width: 640px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }

    /* 导航滚动阴影 */
    .navbar-scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
      background-color: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
    }

    /* 导航下划线动画 */
    .nav-link {
      position: relative;
      font-weight: 500;
      color: var(--deep);
      transition: color 0.25s ease;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 50%;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
      left: 0;
    }

    /* Hero 背景几何图形 */
    .hero-geo {
      background-image: radial-gradient(circle at 30% 40%, rgba(15,61,62,0.08) 1px, transparent 1px);
      background-size: 32px 32px;
      background-color: #fafaf8;
    }

    /* 案例卡片hover */
    .case-card:hover img {
      transform: scale(1.05);
    }
    .case-card img {
      transition: transform 0.35s ease;
    }

    /* FAQ图标 */
    .faq-icon {
      transition: transform 0.3s ease, color 0.3s ease;
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }

    /* 表单聚焦光环 */
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15,61,62,0.15);
    }

    /* 底部导航条 */
    .mobile-nav {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }

    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-md);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(15,61,62,0.2);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 22px -5px rgba(15,61,62,0.3);
      background-color: #0a2e2f;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-md);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background-color: rgba(15,61,62,0.06);
      border-color: #0a2e2f;
      color: #0a2e2f;
    }

    /* 推荐方案标签 */
    .badge-recommend {
      background-color: var(--accent);
      color: white;
      border-radius: 20px;
      padding: 2px 12px;
      font-size: 12px;
      font-weight: 600;
    }

    /* 渐变分割线 */
    .divider {
      height: 1px;
      background: linear-gradient(to right, var(--border), transparent);
    }

    /* 移动端手风琴表格模拟 */
    @media (max-width: 767px) {
      .comparison-table thead {
        display: none;
      }
      .comparison-table tbody tr {
        display: block;
        margin-bottom: 16px;
        background: var(--card);
        border-radius: 12px;
        box-shadow: var(--shadow-card);
        padding: 16px;
      }
      .comparison-table td {
        display: flex;
        justify-content: space-between;
        padding: 8px 0;
        border-bottom: 1px solid var(--border);
      }
      .comparison-table td:last-child {
        border-bottom: none;
      }
      .comparison-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--primary);
      }
    }

    /* 骨架屏占位 */
    .skeleton {
      background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
      background-size: 200% 100%;
      animation: shimmer 1.5s infinite;
    }
    @keyframes shimmer {
      0% { background-position: 200% 0; }
      100% { background-position: -200% 0; }
    }