:root { --fg:#111; --muted:#666; --bg:#fff; --card:#f6f7f9; --line:#e7e9ee; }
*{box-sizing:border-box}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial; color:var(--fg); background:var(--bg)}
.wrap{max-width:920px;margin:0 auto;padding:18px}
header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.dot{width:10px;height:10px;border-radius:999px;background:#111;display:inline-block}
.nav a{margin-left:14px;color:var(--muted);text-decoration:none;font-size:14px}
.nav a:hover{color:var(--fg)}
.hero{padding:26px 0}
.hero h1{margin:0 0 10px 0;font-size:34px;letter-spacing:-0.02em}
.sub{margin:0;color:var(--muted);line-height:1.55}
.chips{margin-top:14px;display:flex;gap:10px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 10px;font-size:12px;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.card{border:1px solid var(--line);background:var(--card);border-radius:12px;padding:14px}
.card h2{margin:0 0 6px 0;font-size:15px}
.card p{margin:0;color:var(--muted);font-size:13px;line-height:1.55}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;font-size:12px}
.foot{display:flex;gap:10px;margin-top:24px;color:var(--muted);font-size:12px;border-top:1px solid var(--line);padding-top:14px}
@media(max-width:820px){.grid{grid-template-columns:1fr}}