:root{--bg:#ffffff;--fg:#111827;--muted:#6b7280;--line:#e5e7eb;--accent:#0f766e;--soft:#f3f4f6}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header{border-bottom:1px solid var(--line)}
.nav{max-width:920px;margin:0 auto;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{font-weight:700;letter-spacing:-.01em;color:var(--fg);font-size:18px}
.nav ul{list-style:none;display:flex;gap:18px;margin:0;padding:0}
.nav ul a{color:var(--muted);font-size:15px}
main{max-width:920px;margin:0 auto;padding:40px 20px 64px}
h1{font-size:34px;line-height:1.2;letter-spacing:-.02em;margin:0 0 8px}
h2{font-size:22px;margin:36px 0 10px}
h3{font-size:17px;margin:24px 0 6px}
p.lead{color:var(--muted);font-size:18px;margin:0 0 28px}
.meta{color:var(--muted);font-size:14px;margin-bottom:28px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:24px}
.card{border:1px solid var(--line);border-radius:12px;padding:18px 18px 16px;background:#fff}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0 0 12px;color:var(--muted);font-size:15px}
.btn{display:inline-block;padding:9px 14px;border-radius:8px;background:var(--fg);color:#fff;font-size:14px;font-weight:600}
.btn:hover{text-decoration:none;opacity:.9}
.btn.secondary{background:var(--soft);color:var(--fg)}
.box{background:var(--soft);border-radius:12px;padding:18px 20px;margin:20px 0}
dl{margin:0}
dt{font-weight:600;margin-top:12px}
dd{margin:2px 0 0;color:var(--muted)}
ul,ol{padding-left:22px}
li{margin:4px 0}
table{border-collapse:collapse;width:100%;font-size:15px}
td,th{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:14px}
footer .inner{max-width:920px;margin:0 auto;padding:22px 20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{color:var(--muted)}
@media (max-width:600px){h1{font-size:28px}.nav ul{gap:12px}}