:root{--bg:#ffffff;--bg2:#f7f8fb;--fg:#0f172a;--muted:#5b6476;--line:#e6e8ef;--card:#ffffff;
--accent:#5b3df5;--accent-fg:#ffffff;--accent-soft:#efecff;--accent2:#0d9488;--code-bg:#0b1020;--code-fg:#e5e9f0;
--inline-code:#f1f2f6;--warn-bg:#fff7ed;--warn-line:#fdba74;--warn-fg:#9a3412;--note-bg:#f0fdfa;--note-line:#14b8a6;
--shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06);--radius:12px;--max:1240px;--prose:740px;
--font:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
--mono:ui-monospace,SFMono-Regular,"JetBrains Mono",Menlo,Consolas,monospace}
@media (prefers-color-scheme:dark){:root{--bg:#0b0f17;--bg2:#0f1520;--fg:#e6e9ef;--muted:#9aa3b2;--line:#1f2633;--card:#111826;
--accent:#9b8cff;--accent-fg:#0b0f17;--accent-soft:#1d1a3a;--accent2:#2dd4bf;--code-bg:#070a12;--inline-code:#1a2130;
--warn-bg:#2a1a0c;--warn-line:#9a3412;--warn-fg:#fdba74;--note-bg:#0b2522;--note-line:#14b8a6;--shadow:0 1px 2px rgba(0,0,0,.3)}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;font:16px/1.7 var(--font);color:var(--fg);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-underline-offset:2px}a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--accent-fg);padding:8px 12px;border-radius:8px;z-index:100}.skip:focus{left:8px}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(1.6) blur(10px);border-bottom:1px solid var(--line)}
.site-header .container{display:flex;align-items:center;gap:20px;height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:750;letter-spacing:-.02em;font-size:1.08rem;white-space:nowrap}
.brand svg{flex:none}
.nav{display:flex;gap:4px;margin-left:8px}.nav a{color:var(--muted);text-decoration:none;font-size:.92rem;padding:6px 10px;border-radius:8px}
.nav a:hover,.nav a[aria-current=page]{color:var(--fg);background:var(--bg2)}
.search{position:relative;margin-left:auto;width:min(340px,100%)}
.search input{width:100%;font:inherit;font-size:.9rem;padding:8px 12px 8px 34px;border:1px solid var(--line);border-radius:10px;background:var(--bg2);color:var(--fg)}
.search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted)}
.search-results{position:absolute;right:0;left:0;top:calc(100% + 6px);background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);list-style:none;margin:0;padding:6px;max-height:60vh;overflow:auto}
.search-results[hidden]{display:none}.search-results a{display:block;padding:8px 10px;border-radius:8px;text-decoration:none;color:var(--fg);font-size:.9rem}
.search-results a:hover,.search-results a:focus{background:var(--accent-soft)}.search-results small{display:block;color:var(--muted)}
/* layout */
.doc{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:56px;padding-top:28px}
.prose{max-width:var(--prose);min-width:0}
.toc{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 100px);overflow:auto;font-size:.86rem;border-left:1px solid var(--line);padding-left:16px}
.toc h2{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 10px}
.toc ol{list-style:none;margin:0;padding:0}.toc li{margin:0}.toc a{display:block;padding:4px 0;color:var(--muted);text-decoration:none;line-height:1.4}
.toc a:hover{color:var(--accent)}.toc .lvl3 a{padding-left:12px;font-size:.82rem}
.crumbs{font-size:.85rem;color:var(--muted);margin:0 0 12px}.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--line)}.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--accent)}
.prose h1{font-size:clamp(1.8rem,4.2vw,2.5rem);line-height:1.15;letter-spacing:-.025em;margin:.1em 0 .4em}
.prose h2{font-size:1.45rem;line-height:1.3;letter-spacing:-.015em;margin:2.2em 0 .6em;padding-top:.4em;border-top:1px solid var(--line)}
.prose h3{font-size:1.12rem;margin:1.8em 0 .4em}.prose h2 a.anchor,.prose h3 a.anchor{opacity:0;margin-left:6px;text-decoration:none;color:var(--muted)}
.prose h2:hover a.anchor,.prose h3:hover a.anchor,.prose a.anchor:focus{opacity:1}
.lede{font-size:1.1rem;color:var(--muted)}
.statusline{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;font-size:.85rem;color:var(--muted);margin:0 0 24px;padding:0 0 18px;border-bottom:1px solid var(--line)}
.pill{white-space:nowrap;display:inline-flex;align-items:center;gap:6px;padding:2px 10px;border-radius:999px;font-size:.78rem;font-weight:600;border:1px solid var(--line)}
.pill.ok{color:var(--accent2);border-color:color-mix(in srgb,var(--accent2) 40%,transparent)}.pill.warn{color:var(--warn-fg);background:var(--warn-bg);border-color:var(--warn-line)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;padding:3px 10px 3px 4px;border-radius:999px;background:var(--bg2);border:1px solid var(--line);color:var(--fg);text-decoration:none}
.chip:hover{border-color:var(--accent)}
.badge{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:7px;font-size:.66rem;font-weight:800;color:#fff;letter-spacing:-.02em;flex:none}
.badge.lg{width:40px;height:40px;border-radius:11px;font-size:.95rem}
.table-wrap{overflow-x:auto;margin:1.2em 0;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;font-size:.86rem}th,td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--bg2);font-weight:650;white-space:nowrap}tr:last-child td{border-bottom:0}
code{font-family:var(--mono);font-size:.86em;background:var(--inline-code);padding:.12em .38em;border-radius:6px;overflow-wrap:anywhere}
.code{position:relative;margin:1.3em 0}
.code-head{display:flex;justify-content:space-between;align-items:center;background:#151b2e;color:#aab3c5;font:600 .75rem var(--font);text-transform:uppercase;letter-spacing:.06em;padding:8px 12px 8px 16px;border-radius:var(--radius) var(--radius) 0 0}
.copy{font:600 .75rem var(--font);color:#dbe1ee;background:#232b42;border:1px solid #333d5a;border-radius:7px;padding:4px 10px;cursor:pointer}
.copy:hover{background:#2c3653}
pre{margin:0;background:var(--code-bg);color:var(--code-fg);padding:16px 18px;border-radius:0 0 var(--radius) var(--radius);overflow-x:auto;line-height:1.55;font-size:.84rem}
pre code{background:none;padding:0;color:inherit;font-size:inherit;overflow-wrap:normal}
.tok-k{color:#c4a7ff}.tok-s{color:#9be28f}.tok-c{color:#8090a8;font-style:italic}.tok-n{color:#ffab70}.tok-d{color:#ffd479}.tok-b{color:#7cc4ff}.tok-f{color:#7cc4ff}
aside{background:var(--note-bg);border-left:4px solid var(--note-line);padding:12px 16px;border-radius:8px;margin:2em 0}
.banner{background:var(--warn-bg);border:1px solid var(--warn-line);color:var(--warn-fg);padding:14px 16px;border-radius:var(--radius);margin:0 0 20px;font-size:.93rem}
.placeholder{background:var(--warn-bg);border:1px dashed var(--warn-line);color:var(--warn-fg);padding:12px 16px;border-radius:var(--radius);margin:0 0 20px;font-size:.92rem}
.author{display:flex;gap:14px;align-items:flex-start;border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:40px 0 0;background:var(--bg2)}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;color:#fff;font-weight:800;flex:none}
.author p{margin:.2em 0;font-size:.9rem;color:var(--muted)}
.related{margin:48px 0 64px}.related h2{border:0;margin-top:0}
/* cards / home */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:10px;transition:border-color .15s,box-shadow .15s,transform .15s}
.card:hover{border-color:color-mix(in srgb,var(--accent) 50%,var(--line));box-shadow:var(--shadow);transform:translateY(-1px)}
.card h3{margin:0;font-size:1.02rem;line-height:1.35}.card p{margin:0;color:var(--muted);font-size:.88rem}
.card .pair{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:.8rem}
.hero{position:relative;padding:72px 0 48px;text-align:center;overflow:hidden;border-bottom:1px solid var(--line);
background:radial-gradient(60% 80% at 50% 0%,var(--accent-soft),transparent 70%),linear-gradient(var(--bg),var(--bg))}
.hero .eyebrow{display:inline-block;font-size:.78rem;font-weight:650;color:var(--accent);background:var(--accent-soft);padding:4px 12px;border-radius:999px;margin-bottom:16px}
.hero h1{font-size:clamp(2.1rem,6vw,3.4rem);line-height:1.08;letter-spacing:-.035em;margin:0 auto 14px;max-width:820px}
.hero h1 span{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);font-size:1.1rem;margin:0 auto;max-width:620px}
.hero .search{margin:28px auto 0;width:min(520px,100%)}.hero .search input{padding:13px 14px 13px 40px;font-size:1rem;border-radius:12px;background:var(--card);box-shadow:var(--shadow)}
.hero .search svg{left:14px}
.trust{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 22px;margin-top:22px;font-size:.85rem;color:var(--muted)}
.trust span::before{content:"✓ ";color:var(--accent2);font-weight:800}
.section{padding:44px 0}.section h2{font-size:1.35rem;letter-spacing:-.015em;margin:0 0 6px}.section .sub{color:var(--muted);margin:0 0 20px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px}
.tool{display:flex;align-items:center;gap:12px;padding:14px;border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--fg);background:var(--card)}
.tool:hover{border-color:var(--accent)}.tool small{display:block;color:var(--muted);font-size:.78rem}
.page-head{padding:36px 0 8px}
.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:.88rem;padding:28px 0 44px;background:var(--bg2);margin-top:40px}
.site-footer .container{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between}.site-footer a{color:var(--muted);margin-right:16px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (max-width:1024px){.doc{grid-template-columns:minmax(0,1fr)}.toc{display:none}}
@media (max-width:720px){.nav{display:none}.site-header .container{gap:12px}.search{width:auto;flex:1}.brand .word{display:none}
body{font-size:15.5px}.hero{padding:44px 0 32px}pre{font-size:.78rem;padding:12px 14px}.prose h2{font-size:1.28rem}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}