/* roulang page: index */
:root {
      --primary-color: #0F4C81;
      --primary-dark: #0F172A;
      --accent-color: #0284C7;
      --teal-color: #0D9488;
      --bg-light: #F8FAFC;
      --bg-card: #FFFFFF;
      --border-color: #E2E8F0;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 16px -2px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.12);
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
    }

    /* 容器基准 */
    .app-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }

    /* 顶部毛玻璃导航条 */
    .glass-header {
      background-color: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      position: sticky;
      top: 0;
      z-index: 100;
      transition: all 0.3s ease;
    }

    /* 沉浸式 Hero 视频官网质感 */
    .hero-mask-wrapper {
      position: relative;
      background-image: linear-gradient(to bottom, rgba(15, 23, 42, 0.78), rgba(15, 23, 42, 0.92)), url('/assets/images/d21d0707c1a2a19f.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }

    /* 卡片悬停提升系统 */
    .smart-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 1rem;
      transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
    }
    .smart-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #BAE6FD;
    }

    /* 数据指标网格 */
    .metric-gradient-card {
      background: linear-gradient(135deg, #FFFFFF 0%, #F0F9FF 100%);
      border: 1px solid #E0F2FE;
    }

    /* 步骤连线指示器 */
    .step-node::after {
      content: '';
      position: absolute;
      top: 50%;
      right: -24px;
      width: 24px;
      height: 2px;
      background: #CBD5E1;
      display: none;
    }
    @media (min-width: 1024px) {
      .step-node::after {
        display: block;
      }
      .step-node:last-child::after {
        display: none;
      }
    }

    /* FAQ 手风琴动画 */
    details summary {
      cursor: pointer;
      list-style: none;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }

    /* 表单输入框高光 */
    .input-field {
      width: 100%;
      padding: 0.75rem 1rem;
      border-radius: 0.5rem;
      border: 1px solid #CBD5E1;
      background-color: #FFFFFF;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--accent-color);
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }