:root{--bg:#fff;--fg:#1d1d1f;--muted:#6e6e73;--accent:#5b4bdb;--card:#f5f5f7}
@media(prefers-color-scheme:dark){:root{--bg:#111114;--fg:#f5f5f7;--muted:#a1a1a6;--accent:#9a8cff;--card:#1c1c20}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main,header,footer{max-width:760px;margin:0 auto;padding:0 20px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:20px;padding-bottom:20px}
header a{color:var(--fg);text-decoration:none;font-weight:600}
.hero{text-align:center;padding:48px 0}
.hero img{width:160px;height:160px;filter:drop-shadow(0 8px 20px rgba(0,0,0,.25))}
h1{font-size:2.4rem;margin:24px 0 8px;line-height:1.15}
.lead{color:var(--muted);font-size:1.2rem;max-width:34em;margin:0 auto 24px}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:12px 26px;border-radius:999px;text-decoration:none;font-weight:600}
.features{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));padding:24px 0}
.features div{background:var(--card);border-radius:16px;padding:20px}
.features h2{font-size:1.1rem;margin:0 0 6px}
.features p{margin:0;color:var(--muted);font-size:.95rem}
a{color:var(--accent)}
footer{color:var(--muted);font-size:.9rem;padding-top:32px;padding-bottom:40px;text-align:center}
article h1{font-size:2rem}article h2{margin-top:2em}
article ul{padding-left:1.2em}