*,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      background: #111111;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 2.5rem;
      height: 60px;
      background: #000;
      border-bottom: 3px solid #CC1F1F;
      flex-shrink: 0;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: #fff;
      letter-spacing: -0.5px;
      text-transform: uppercase;
      text-decoration: none;
    }

    .logo span {
      color: #CC1F1F;
    }

    .topbar-right {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: rgba(255, 255, 255, 0.4);
    }

    .topbar-right i {
      font-size: 14px;
    }

    .page {
      flex: 1;
      display: flex;
      justify-content: center;
      padding: 3rem 2rem;
    }

    .doc {
      width: 100%;
      max-width: 720px;
      background: #fff;
      border-radius: 8px;
      padding: 3rem 3rem 2.5rem;
    }

    .doc-header {
      margin-bottom: 2rem;
    }

    .doc-tag {
      display: inline-block;
      font-size: 10px;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: #fff;
      background: #CC1F1F;
      padding: 3px 8px;
      border-radius: 3px;
      margin-bottom: 0.75rem;
    }

    .doc-title {
      font-size: 28px;
      font-weight: 700;
      color: #111;
      margin-bottom: 6px;
      letter-spacing: -0.5px;
    }

    .doc-meta {
      font-size: 12px;
      color: #999;
    }

    .doc-body h2 {
      font-size: 16px;
      font-weight: 700;
      color: #111;
      margin: 2rem 0 0.75rem;
      letter-spacing: -0.3px;
    }

    .doc-body h2:first-child {
      margin-top: 0;
    }

    .doc-body p {
      font-size: 14px;
      color: #444;
      line-height: 1.75;
      margin-bottom: 0.75rem;
    }

    .doc-body ul {
      margin: 0.5rem 0 1rem 1.25rem;
      font-size: 14px;
      color: #444;
      line-height: 1.75;
    }

    .doc-body ul li {
      margin-bottom: 0.35rem;
    }

    .doc-body strong {
      color: #222;
    }

    .divider-line {
      height: 1px;
      background: #E8E8E8;
      margin: 2rem 0;
    }

    .back-link {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-top: 2rem;
      font-size: 13px;
      color: #CC1F1F;
      text-decoration: none;
    }

    .back-link:hover {
      text-decoration: underline;
    }

    .back-link i {
      font-size: 16px;
    }

    .bottombar {
      background: #000;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 12px 2.5rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-shrink: 0;
    }

    .bottombar-left {
      font-size: 11px;
      color: rgba(255, 255, 255, 0.3);
    }

    .bottombar-right {
      display: flex;
      gap: 20px;
    }

    .bottombar-right a {
      font-size: 11px;
      color: rgba(255, 255, 255, 0.3);
      text-decoration: none;
      cursor: pointer;
    }

    .bottombar-right a:hover {
      color: rgba(255, 255, 255, 0.6);
    }

    @media (max-width: 600px) {
      .topbar {
        padding: 0 1.25rem;
      }

      .page {
        padding: 1.5rem 1.25rem;
      }

      .doc {
        padding: 2rem 1.5rem 1.5rem;
      }

      .doc-title {
        font-size: 22px;
      }

      .bottombar {
        padding: 12px 1.25rem;
        flex-direction: column;
        gap: 8px;
        text-align: center;
      }
    }

    .nav-icon-btn,
    .theme-btn {
      border: none;
      background: transparent;
      color: inherit;
      cursor: pointer;
      padding: 0.45rem;
      border-radius: 999px;
      transition: background 0.2s, color 0.2s, opacity 0.2s;
    }

    .nav-icon-btn:hover,
    .theme-btn:hover {
      opacity: 0.8;
      background: rgba(255, 255, 255, 0.08);
    }

    body.light {
      background: #F5F7FA;
      color: #111;
    }

    body.light .topbar,
    body.light .topnav {
      background: #fff;
      border-color: #E5E7EB;
      color: #111;
    }

    body.light .topbar-right,
    body.light .topnav-right {
      color: rgba(0, 0, 0, 0.65);
    }

    body.light .logo {
      color: #111;
    }

    body.light .logo span {
      color: #CC1F1F;
    }

    body.light a,
    body.light .nav-link {
      color: #111;
    }

    body.light .bottombar { background: #fff; border-top-color: #E8E8E8; }
    body.light .bottombar-left { color: rgba(0,0,0,0.4); }
    body.light .bottombar-right a { color: rgba(0,0,0,0.4); }
    body.light .bottombar-right a:hover { color: #111; }
    body.light .nav-icon-btn, body.light .theme-btn { color: rgba(0,0,0,0.4); }
    body.light .nav-icon-btn:hover, body.light .theme-btn:hover { color: #111; background: rgba(0,0,0,0.04); }