/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1d3594;
      --accent-blue: #0284C7;
      --accent-green: #0D9488;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-sub: #64748B;
      --border-color: rgba(226, 232, 240, 0.9);
      --card-radius: 14px;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 20px 25px -5px rgba(30, 64, 175, 0.08), 0 8px 10px -6px rgba(30, 64, 175, 0.04);
    }
    *, *::before, *::after { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-muted);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      line-height: 1.35;
      font-weight: 700;
    }
    a { text-decoration: none; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; display: block; }

    /* 顶部微型状态条 */
    .top-status-bar {
      background-color: #F1F5F9;
      font-size: 0.85rem;
      border-bottom: 1px solid var(--border-color);
      color: var(--text-sub);
    }
    .pulse-indicator {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: #10B981;
      margin-right: 6px;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 1.8s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
      100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }

    /* 导航栏 */
    .custom-navbar {
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo:hover { color: var(--accent-blue); }
    .brand-logo i { font-size: 1.6rem; color: var(--accent-blue); }
    .nav-link {
      font-weight: 600;
      color: var(--text-muted) !important;
      font-size: 0.98rem;
      padding: 0.5rem 1rem !important;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }

    /* 按钮规范 */
    .btn-main {
      background-color: var(--primary);
      color: #fff;
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 1.6rem;
      border: 1px solid var(--primary);
      box-shadow: 0 4px 10px rgba(30, 64, 175, 0.2);
      transition: all 0.25s ease;
    }
    .btn-main:hover {
      background-color: var(--primary-hover);
      border-color: var(--primary-hover);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(30, 64, 175, 0.28);
    }
    .btn-outline-main {
      background-color: #fff;
      color: var(--primary);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 1.6rem;
      border: 1px solid rgba(30, 64, 175, 0.4);
    }
    .btn-outline-main:hover {
      background-color: #EFF6FF;
      color: var(--primary-hover);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* 卡片与板块通用 */
    .site-section {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 1rem;
      position: relative;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      max-width: 780px;
      margin: 0 auto 2.5rem;
      line-height: 1.8;
    }
    .custom-card {
      background: var(--bg-white);
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      height: 100%;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    /* Hero */
    .hero-banner {
      background: linear-gradient(135deg, rgba(239, 246, 255, 0.94) 0%, rgba(248, 250, 252, 0.98) 100%), url('/assets/images/e664d2293cffec9a.png') center/cover no-repeat;
      padding: 5.5rem 0 4.5rem;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #DBEAFE;
      color: #1E40AF;
      font-size: 0.88rem;
      font-weight: 700;
      padding: 0.35rem 0.9rem;
      border-radius: 50px;
      margin-bottom: 1.25rem;
    }
    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 1.25rem;
    }

    /* 对比区 */
    .contrast-card {
      padding: 2.2rem;
      border-radius: var(--card-radius);
    }
    .contrast-traditional {
      background: #F1F5F9;
      border: 1px solid #CBD5E1;
    }
    .contrast-modern {
      background: #FFFFFF;
      border: 2px solid var(--primary);
      box-shadow: 0 10px 25px rgba(30, 64, 175, 0.12);
    }

    /* 深色沉浸板块 */
    .dark-section {
      background: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);
      color: #F8FAFC;
    }
    .dark-section h2, .dark-section h3, .dark-section h4 {
      color: #FFFFFF;
    }
    .dark-section .text-sub {
      color: #94A3B8;
    }
    .dark-card {
      background: rgba(30, 41, 59, 0.7);
      border: 1px solid rgba(148, 163, 184, 0.2);
      border-radius: var(--card-radius);
      padding: 2rem;
    }

    /* 运行数据条 */
    .stats-strip {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 3.5rem 0;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 0.5rem;
    }

    /* 手风琴与折叠 */
    .accordion-item {
      border: 1px solid var(--border-color);
      margin-bottom: 1rem;
      border-radius: 10px !important;
      overflow: hidden;
      background: #fff;
    }
    .accordion-button {
      font-weight: 700;
      color: var(--text-main);
      font-size: 1.05rem;
      background: #FFFFFF;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background-color: #F0F9FF;
      box-shadow: none;
    }

    /* 页脚 */
    .footer-dark {
      background-color: #0B0F19;
      color: #94A3B8;
      font-size: 0.92rem;
      padding-top: 4.5rem;
      padding-bottom: 2.5rem;
      border-top: 1px solid #1E293B;
    }
    .footer-title {
      color: #F8FAFC;
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links li {
      margin-bottom: 0.6rem;
    }
    .footer-links a {
      color: #94A3B8;
    }
    .footer-links a:hover {
      color: #38BDF8;
    }

    @media (max-width: 991px) {
      .hero-title { font-size: 2.2rem; }
      .section-title { font-size: 1.8rem; }
      .site-section { padding-top: 3.5rem; padding-bottom: 3.5rem; }
    }
    @media (max-width: 576px) {
      .hero-title { font-size: 1.85rem; }
      .stat-number { font-size: 2.2rem; }
    }