.card{max-width:32rem;text-align:center;background:#161b22b3;border:1px solid #30363d;border-radius:16px;padding:3rem 2.5rem;box-shadow:0 12px 40px #0006}h1{margin-top:0;font-size:1.9rem}p{line-height:1.6}.muted{color:var(--muted);font-size:.9rem}button{font:inherit;font-weight:600;color:#fff;background:var(--accent);border:none;border-radius:8px;padding:.6em 1.2em;cursor:pointer;transition:filter .15s ease}button:hover{filter:brightness(1.1)}code{background:#6e768140;padding:.15em .4em;border-radius:6px;font-size:.9em;color:var(--accent)}:root{color-scheme:light dark;--bg: #0d1117;--fg: #e6edf3;--muted: #8b949e;--accent: #2f81f7;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at top,#161b22,var(--bg));color:var(--fg);padding:1.5rem}