:root{--bg:#fff;--fg:#14181f;--muted:#5b6472;--line:#e4e7ec;--brand:#2563eb;--soft:#f5f7fa}
@media (prefers-color-scheme:dark){:root{--bg:#0e1116;--fg:#e8ebf0;--muted:#9aa3b2;--line:#252b36;--brand:#6ea0ff;--soft:#161b24}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,sans-serif}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--bg);z-index:5}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.logo{font-weight:700;font-size:1.15rem;color:var(--fg);display:flex;align-items:center;gap:8px}
.logo:hover{text-decoration:none}
nav{display:flex;gap:18px;flex-wrap:wrap;font-size:.95rem}
nav a{color:var(--muted)}nav a:hover,nav a.on{color:var(--fg);text-decoration:none}
.hero{padding:88px 0 64px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.2;margin:0 0 18px;letter-spacing:-.02em}
.hero p{font-size:1.15rem;color:var(--muted);max-width:620px;margin:0 0 28px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:11px 22px;border-radius:8px;font-weight:600}
.btn:hover{text-decoration:none;opacity:.9}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--line);margin-left:10px}
section{padding:48px 0;border-top:1px solid var(--line)}
section h2{margin:0 0 24px;font-size:1.5rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.card{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:22px}
.card h3{margin:0 0 8px;font-size:1.05rem}.card p{margin:0;color:var(--muted);font-size:.95rem}
article{padding:56px 0 72px;max-width:760px}
article h1{font-size:2rem;margin:0 0 6px}
article h2{font-size:1.25rem;margin:36px 0 10px}
article .meta{color:var(--muted);font-size:.9rem;margin-bottom:28px}
article li{margin:6px 0}
table{border-collapse:collapse;width:100%;font-size:.93rem;margin:14px 0}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}th{background:var(--soft)}
footer.site{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:.9rem}
footer.site .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
footer.site a{color:var(--muted);margin-right:16px}
.center{text-align:center;padding:120px 0}.center h1{font-size:4rem;margin:0}