:root{--accent:#2f6f5e;--fg:#1c2128;--muted:#5b6470;--bg:#ffffff;--soft:#f5f6f8;--line:#e3e6ea}
@media (prefers-color-scheme:dark){:root{--fg:#e6e8eb;--muted:#9aa3ad;--bg:#111418;--soft:#181c21;--line:#262b31}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:700;font-size:18px;color:var(--fg);letter-spacing:-.01em}.logo span{color:var(--accent)}
nav a{color:var(--muted);margin-left:22px;font-size:15px}nav a.on,nav a:hover{color:var(--fg);text-decoration:none}
.hero{padding:88px 0 72px;background:var(--soft);border-bottom:1px solid var(--line)}
.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.15;margin:0 0 18px;letter-spacing:-.02em;max-width:760px}
.hero p{font-size:19px;color:var(--muted);max-width:640px;margin:0 0 28px}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:12px 22px;border-radius:6px;font-weight:600}
.btn:hover{text-decoration:none;opacity:.92}
section{padding:64px 0}h2{font-size:28px;margin:0 0 28px;letter-spacing:-.01em}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px}
.card{border:1px solid var(--line);border-radius:10px;padding:26px;background:var(--bg)}
.card h3{margin:0 0 10px;font-size:19px}.card p{margin:0;color:var(--muted)}
.prose{max-width:720px}.prose p{color:var(--muted)}
dl{display:grid;grid-template-columns:140px 1fr;gap:10px 18px;margin:0}dt{color:var(--muted)}dd{margin:0}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:14px}
@media (max-width:600px){nav a{margin-left:14px}header .wrap{height:auto;padding-top:14px;padding-bottom:14px;flex-wrap:wrap;gap:8px}dl{grid-template-columns:1fr}}