:root{--bg:#fafafa;--surface:#fff;--border:#e4e4e7;--text:#18181b;--muted:#52525b;--faint:#71717a;--accent:#1d4ed8;--accent-hover:#1e40af}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,PingFang SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.6}.wrap{max-width:960px;margin:0 auto;padding:0 20px}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.site-header .wrap{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;min-height:56px;padding-top:8px;padding-bottom:8px;display:flex}.brand{letter-spacing:-.01em;color:var(--text);font-size:18px;font-weight:700}.brand:hover{text-decoration:none}.nav{flex-wrap:wrap;align-items:center;gap:18px;display:flex}.nav a{color:var(--muted);font-size:14px}.nav a:hover{color:var(--text);text-decoration:none}.nav a[aria-current=page]{color:var(--text);font-weight:600}.lang-menu{position:relative}.lang-menu>summary{cursor:pointer;color:var(--muted);-webkit-user-select:none;user-select:none;font-size:14px;list-style:none}.lang-menu>summary::-webkit-details-marker{display:none}.lang-menu>summary:after{content:"";vertical-align:middle;border:1.5px solid;border-width:0 1.5px 1.5px 0;margin-left:6px;padding:2.5px;display:inline-block;transform:translateY(-1px)rotate(45deg)}.lang-menu[open]>summary{color:var(--text)}.lang-menu[open]>summary:after{transform:translateY(1px)rotate(-135deg)}.lang-menu ul{z-index:30;background:var(--surface);border:1px solid var(--border);border-radius:8px;min-width:148px;margin:0;padding:6px 0;list-style:none;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 10px 28px #18181b1a}.lang-menu a{color:var(--muted);white-space:nowrap;padding:8px 14px;font-size:14px;text-decoration:none;display:block}.lang-menu a:hover{color:var(--text);background:var(--bg);text-decoration:none}.lang-menu a[aria-current=true]{color:var(--text);font-weight:600}.site-footer .lang-menu ul{top:auto;bottom:calc(100% + 8px)}.btn{background:var(--accent);color:#fff;border-radius:6px;padding:7px 14px;font-size:14px;font-weight:600;display:inline-block}.nav .btn,.nav .btn:hover{color:#fff}.btn:hover{background:var(--accent-hover);color:#fff;text-decoration:none}.btn-lg{border-radius:8px;padding:11px 22px;font-size:16px}.quiet{color:var(--muted);font-size:15px}main{padding:40px 0 56px}.hero{max-width:720px;padding:24px 0 32px}.hero h1{letter-spacing:-.02em;margin:0 0 16px;font-size:36px;line-height:1.2}.lede{color:var(--muted);margin:0 0 24px;font-size:18px}.actions{flex-wrap:wrap;align-items:center;gap:20px;display:flex}.grid{gap:16px;display:grid}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px 22px}.card h2{margin:0 0 10px;font-size:17px}.card p,.card li{color:var(--muted);font-size:14.5px}.card p{margin:0}.card ul{margin:0;padding-left:18px}.card li{margin:6px 0}.prose{max-width:720px}.prose h1{letter-spacing:-.02em;margin:0 0 16px;font-size:30px}.prose h2{margin:28px 0 8px;font-size:19px}.prose p,.prose li{color:var(--muted);font-size:15.5px}.prose ul{padding-left:20px}.prose li{margin:6px 0}.prose code{border:1px solid var(--border);background:#f4f4f5;border-radius:4px;padding:1px 5px;font-size:.9em}.cite{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:12px 16px;font-family:ui-monospace,SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:14px}.note{color:var(--faint);font-size:14px}.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:24px 0 28px}.site-footer .wrap{flex-wrap:wrap;align-items:center;gap:18px;display:flex}.site-footer a{color:var(--muted);font-size:14px}.site-footer a:hover{color:var(--text)}.fine{color:var(--faint);margin:0 0 0 auto;font-size:13px}@media (width<=720px){.grid.two{grid-template-columns:1fr}.hero h1{font-size:28px}}