/* roulang page: index */
:root {
      --bg-main: #0B0F17;
      --bg-surface: #131A26;
      --bg-card: #1A2332;
      --border-color: rgba(255, 255, 255, 0.08);
      --accent: #00DC82;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.75;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }
    .custom-container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    .section-spacing {
      padding-top: 5.5rem;
      padding-bottom: 5.5rem;
    }
    .section-alt {
      background-color: var(--bg-surface);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .card-base {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 0.75rem;
      transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    }
    .card-base:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 220, 130, 0.35);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
    }
    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      padding: 0.25rem 0.75rem;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      border-radius: 9999px;
      background: rgba(0, 220, 130, 0.12);
      color: var(--accent);
      border: 1px solid rgba(0, 220, 130, 0.25);
    }
    .btn-brand-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 1.75rem;
      font-size: 0.95rem;
      font-weight: 600;
      color: #0B0F17;
      background-color: var(--accent);
      border-radius: 0.5rem;
      transition: background-color 0.2s, transform 0.15s;
    }
    .btn-brand-primary:hover {
      background-color: #00BA6E;
    }
    .btn-brand-primary:active {
      transform: scale(0.97);
    }
    .btn-brand-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 1.75rem;
      font-size: 0.95rem;
      font-weight: 600;
      color: #F8FAFC;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 0.5rem;
      transition: background 0.2s, border-color 0.2s, transform 0.15s;
    }
    .btn-brand-outline:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #F8FAFC;
    }
    .btn-brand-outline:active {
      transform: scale(0.97);
    }
    details summary {
      cursor: pointer;
      list-style: none;
    }
    details summary::-webkit-details-marker {
      display: none;
    }