:root{--bg:#f7f8fa;--card:#fff;--text:#1a1d23;--muted:#667085;--accent:#4f46e5;--border:#e4e7ec}
@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--card:#171a21;--text:#e8eaed;--muted:#98a2b3;--accent:#818cf8;--border:#2a2f3a}}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
header,main,footer{max-width:900px;margin:0 auto;padding:20px}
header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border)}
header a{color:var(--text);text-decoration:none;margin-left:16px}
header .logo{font-weight:700;margin-left:0}
h1{font-size:2rem;margin:.5em 0 .2em}
.sub{color:var(--muted);margin-bottom:24px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;text-decoration:none;color:var(--text);display:block}
.card:hover{border-color:var(--accent)}
.card h2{margin:0 0 6px;font-size:1.2rem}
.card p{margin:0;color:var(--muted)}
footer{color:var(--muted);font-size:.9rem;text-align:center;border-top:1px solid var(--border);margin-top:40px}
footer a{color:var(--muted)}