:root {
    color-scheme: light dark;
    --bg: #f6f7f9;
    --surface: #ffffff;
    --text: #16181d;
    --muted: #5b6270;
    --border: #dfe3e8;
    --accent: #2563eb;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14161a;
        --surface: #1c1f25;
        --text: #e8eaed;
        --muted: #9aa2b1;
        --border: #2c313a;
        --accent: #6ea8fe;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.shell {
    max-width: 60rem;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

h1 { font-size: 1.5rem; margin: 0 0 0.75rem; }

a { color: var(--accent); }