/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-hover: #0D9488;
      --accent: #F59E0B;
      --bg-slate: #0F172A;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: rgba(226, 232, 240, 0.9);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-soft: 0 10px 25px -5px rgba(15, 118, 110, 0.08), 0 8px 10px -6px rgba(15, 118, 110, 0.04);
      --shadow-deep: 0 20px 35px -10px rgba(15, 23, 42, 0.25);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .custom-scroll-smooth {
      scroll-behavior: smooth;
    }
    .hero-bg {
      background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 118, 110, 0.88) 100%), url('/assets/images/134945ffec57e73a.jpg');
      background-size: cover;
      background-position: center;
    }
    .dark-sec-bg {
      background-image: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);
    }
    .card-modern {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-soft);
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-modern:hover {
      transform: translateY(-4px);
      box-shadow: 0 18px 30px -8px rgba(15, 118, 110, 0.16);
      border-color: #CBD5E1;
    }
    .tag-badge {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      line-height: 1;
    }
    .btn-brand-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      padding: 0.85rem 1.85rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      border: 1px solid transparent;
    }
    .btn-brand-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 14px rgba(15, 118, 110, 0.35);
    }
    .btn-brand-secondary {
      background-color: #FFFFFF;
      color: var(--text-main);
      padding: 0.85rem 1.85rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      border: 1px solid #E2E8F0;
    }
    .btn-brand-secondary:hover {
      background-color: #F1F5F9;
      border-color: #CBD5E1;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }