:root{--bg:#fafaf8;--fg:#1a1a1a;--mute:#5a5a5a;--line:#e3e3de;--accent:#1f4e79}
@media (prefers-color-scheme:dark){:root{--bg:#121212;--fg:#ededed;--mute:#a8a8a8;--line:#2a2a2a;--accent:#7fb2e5}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif}
.wrap{max-width:820px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}header .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding-top:18px;padding-bottom:18px}
.brand{font-weight:700;color:var(--fg);text-decoration:none}nav a{color:var(--mute);text-decoration:none;margin-left:18px}nav a:first-child{margin-left:0}nav a:hover{color:var(--accent)}
main{padding:48px 0}h1{font-size:2.2rem;line-height:1.2;margin:0 0 16px}h2{margin-top:36px}a{color:var(--accent)}
.lead{font-size:1.2rem;color:var(--mute)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:24px}
.card{border:1px solid var(--line);border-radius:10px;padding:18px}.card h3{margin:0 0 6px}
footer{border-top:1px solid var(--line);color:var(--mute);font-size:.9rem;padding:24px 0 40px}