:root{--bg:#0f1117;--fg:#e6e8ee;--muted:#9aa3b2;--accent:#6ea8fe;--card:#181b24}
@media (prefers-color-scheme:light){:root{--bg:#fafafa;--fg:#14161c;--muted:#5b6475;--accent:#2557d6;--card:#fff}}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,sans-serif;background:var(--bg);color:var(--fg)}
header,main,footer{max-width:860px;margin:0 auto;padding:1rem}
nav a{margin-right:1rem;color:var(--accent);text-decoration:none}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}
.card{background:var(--card);padding:1rem;border-radius:12px}
.btn{display:inline-block;padding:.6rem 1.2rem;background:var(--accent);color:#fff;border-radius:8px;text-decoration:none}
.muted{color:var(--muted)}