:root {
            --bg: #0f172a;
            --card-bg: #1e293b;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --accent: #38bdf8;
            --code-bg: #0b1120;
            --border: #334155;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--bg);
            color: var(--text-main);
            line-height: 1.6;
            padding: 40px 20px;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
        }

        header {
            margin-bottom: 40px;
            border-bottom: 1px solid var(--border);
            padding-bottom: 20px;
        }

        h1 {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 8px;
        }

        p.lead {
            color: var(--text-muted);
            font-size: 1.05rem;
        }

        .grid {
            display: grid;
            grid-gap: 24px;
        }

        .card {
            background-color: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 20px;
        }

        h2 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            color: #e2e8f0;
        }

        p {
            color: var(--text-muted);
            margin-bottom: 14px;
            font-size: 0.95rem;
        }

        pre {
            background-color: var(--code-bg);
            border: 1px solid var(--border);
            padding: 12px 16px;
            border-radius: 6px;
            overflow-x: auto;
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            font-size: 0.9rem;
            color: #38bdf8;
        }

        footer {
            margin-top: 50px;
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            padding-top: 20px;
        }