:root {
        --bg: #0d1117;
        --panel: #161b22;
        --text: #c9d1d9;
        --muted: #8b949e;
        --brand: #2ea043;
        --brand-fore: #fff;
        --border: #30363d;
        --accent: #58a6ff;
        --warn: #d29922;
      }
      * {
        box-sizing: border-box;
      }
      body {
        margin: 0;
        background: var(--bg);
        color: var(--text);
        font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu,
          "Helvetica Neue", Arial;
      }
      a {
        color: var(--accent);
        text-decoration: none;
      }
      .wrap {
        max-width: 980px;
        margin: 40px auto;
        padding: 0 20px;
      }
      .hero {
        display: flex;
        gap: 16px;
        align-items: center;
        margin-bottom: 24px;
      }
      .hero h1 {
        margin: 0;
        font-size: 28px;
      }
      .badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        background: #0b1520;
        border: 1px solid var(--border);
        color: var(--muted);
        padding: 6px 10px;
        border-radius: 8px;
        font-size: 13px;
      }
      .panel {
        background: var(--panel);
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 22px;
        margin: 18px 0;
      }
      .panel h2 {
        margin-top: 0;
        font-size: 20px;
      }
      h4 {
        font-size: 22px;
      }
      .muted {
        color: var(--muted);
      }
      .grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 16px;
      }
      .card {
        background: #0f141a;
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 16px;
      }
      .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        border-radius: 10px;
        border: 1px solid #1f6feb;
        padding: 14px 18px;
        font-weight: 600;
        font-size: 16px;
      }
      .btn--primary {
        background: var(--brand);
        border-color: #238636;
        color: var(--brand-fore);
      }
      .btn--secondary {
        background: #21262d;
        border-color: var(--border);
        color: var(--text);
      }
      .btn--full {
        width: 100%;
      }
      .btn:hover {
        cursor: pointer;
      }
      .note {
        border-left: 4px solid var(--warn);
        padding: 10px 12px;
        background: #1b1f25;
        border-radius: 8px;
      }
      video.demo {
        display: block;
        width: 100%;
        max-height: 360px;
        border: 1px solid var(--border);
        border-radius: 12px;
        background: #0b0f14;
        object-fit: cover;
      }
      code,
      .kbd {
        background: #11161d;
        border: 1px solid var(--border);
        border-radius: 8px;
        padding: 3px 6px;
        font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
          "Liberation Mono", "Courier New", monospace;
        font-size: 90%;
      }
      .copybox {
        display: flex;
        gap: 8px;
        align-items: stretch;
      }
      .copybox input {
        flex: 1;
        background: #0b0f14;
        border: 1px solid var(--border);
        border-radius: 10px;
        padding: 12px 12px;
        color: var(--text);
        font-family: inherit;
        font-size: 16px;
      }
      .small {
        font-size: 16px;
      }
      .footer {
        margin: 36px 0 16px;
        color: var(--muted);
        font-size: 13px;
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        align-items: center;
        justify-content: center;
        border-top: 1px solid var(--border);
        padding-top: 16px;
      }
      .footer a {
        color: var(--muted);
        font-size: 13px;
      }
      .footer a:hover {
        color: var(--accent);
      }