:root{--purple:#6C4BF6;--purple-dark:#5638d6;--ink:#16161d;--muted:#5c5c6a;--line:#e8e8ef;--bg:#fafafc;--card:#ffffff;--header:#0b0b0f;}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
a{color:var(--purple);text-decoration:none}a:hover{text-decoration:underline}
header.site{background:var(--header);color:#fff;position:sticky;top:0;z-index:50}
header.site .inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:14px;padding:14px 24px}
.wordmark{font-weight:800;font-size:22px;letter-spacing:-.5px;color:#fff}
.wordmark .dot{color:var(--purple)}
.hc-badge{background:rgba(108,75,246,.18);color:#c9b8ff;font-size:12.5px;font-weight:600;padding:3px 10px;border-radius:999px;border:1px solid rgba(108,75,246,.4)}
header.site nav{margin-left:auto;display:flex;gap:18px;align-items:center}
header.site nav a{color:#d7d7e0;font-size:14px}
header.site nav a.cta{background:var(--purple);color:#fff;padding:8px 16px;border-radius:999px;font-weight:600}
header.site nav a.cta:hover{background:var(--purple-dark);text-decoration:none}
.shell{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:264px minmax(0,1fr);gap:40px;padding:32px 24px}
aside.toc{position:sticky;top:76px;align-self:start;max-height:calc(100vh - 100px);overflow:auto;padding-right:8px}
aside.toc details{margin-bottom:6px}
aside.toc summary{cursor:pointer;font-weight:650;font-size:13.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:6px 8px;border-radius:8px;list-style:none}
aside.toc summary::-webkit-details-marker{display:none}
aside.toc summary:hover{background:#efeff6}
aside.toc ul{list-style:none;margin:2px 0 10px;padding:0}
aside.toc li a{display:block;font-size:14px;color:#3c3c48;padding:5px 8px 5px 16px;border-left:2px solid var(--line);border-radius:0 8px 8px 0}
aside.toc li a:hover{background:#efeff6;text-decoration:none}
aside.toc li a.current{color:var(--purple);border-left-color:var(--purple);font-weight:600;background:#f3f0ff}
main{min-width:0}
.crumbs{font-size:13.5px;color:var(--muted);margin:0 0 10px}
.crumbs a{color:var(--muted)}
article h1{font-size:32px;letter-spacing:-.8px;line-height:1.2;margin:0 0 6px}
article h2{font-size:22px;letter-spacing:-.4px;margin:36px 0 10px;padding-top:6px}
article h3{font-size:17.5px;margin:26px 0 8px}
article p,article li{color:#26262f}
article code{background:#efeff6;border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:.9em}
article pre{background:#101017;color:#e8e8f2;padding:16px;border-radius:12px;overflow:auto}
article pre code{background:none;border:none;color:inherit;padding:0}
article blockquote{margin:16px 0;padding:10px 18px;border-left:3px solid var(--purple);background:#f3f0ff;border-radius:0 10px 10px 0;color:#3a3a46}
article table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14.5px;display:block;overflow-x:auto}
article th,article td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
article th{background:#f2f2f8}
article img{max-width:100%}
.updated{font-size:13px;color:var(--muted);margin:4px 0 26px}
.pill{display:inline-block;font-size:12.5px;font-weight:600;color:var(--purple);background:#f3f0ff;border:1px solid #e2daff;padding:2px 10px;border-radius:999px;margin-bottom:14px}
.next-prev{display:flex;gap:14px;margin-top:44px}
.next-prev a{flex:1;border:1px solid var(--line);background:var(--card);border-radius:14px;padding:14px 16px;font-size:14px}
.next-prev a:hover{border-color:var(--purple);text-decoration:none}
.next-prev .lbl{display:block;font-size:12px;color:var(--muted);margin-bottom:3px}
footer.site{border-top:1px solid var(--line);margin-top:60px;background:var(--card)}
footer.site .inner{max-width:1200px;margin:0 auto;padding:26px 24px;display:flex;flex-wrap:wrap;gap:18px;font-size:13.5px;color:var(--muted);align-items:center}
footer.site .inner a{color:var(--muted)}
footer.site .spacer{flex:1}
/* search */
.search{position:relative;max-width:560px;margin:0 auto}
.search input{width:100%;padding:13px 18px 13px 44px;border-radius:999px;border:1px solid var(--line);font-size:15.5px;background:#fff url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="none" stroke="%235c5c6a" stroke-width="2" viewBox="0 0 24 24"%3E%3Ccircle cx="11" cy="11" r="7"/%3E%3Cpath d="m20 20-3.8-3.8"/%3E%3C/svg%3E') 16px center no-repeat;outline:none}
.search input:focus{border-color:var(--purple);box-shadow:0 0 0 3px #e2daff}
.search .results{position:absolute;left:0;right:0;top:calc(100% + 6px);background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 32px rgba(10,10,20,.10);max-height:340px;overflow:auto;display:none;z-index:40}
.search .results a{display:block;padding:10px 16px;border-bottom:1px solid var(--line);font-size:14.5px}
.search .results a:last-child{border-bottom:none}
.search .results a:hover{background:#f3f0ff;text-decoration:none}
.search .results .cat{display:block;font-size:12px;color:var(--muted)}
/* home */
.hero{background:var(--header);color:#fff;padding:54px 24px 60px;text-align:center}
.hero h1{font-size:38px;letter-spacing:-1px;margin:0 0 10px}
.hero p{color:#b9b9c6;margin:0 0 26px;font-size:16.5px}
.hero .hl{color:#a58bff}
.cats{max-width:1200px;margin:-26px auto 0;padding:0 24px 20px;display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 22px;box-shadow:0 6px 18px rgba(10,10,20,.05)}
.cat-card h2{margin:0 0 4px;font-size:17.5px;letter-spacing:-.3px}
.cat-card h2 a{color:var(--ink)}
.cat-card ul{list-style:none;margin:10px 0 0;padding:0}
.cat-card li{margin:7px 0;font-size:14.5px}
.cat-card .more{font-size:13.5px;color:var(--muted)}
@media (max-width:900px){.shell{grid-template-columns:1fr;padding:22px 18px}aside.toc{position:static;max-height:none;order:2;border-top:1px solid var(--line);padding-top:18px;margin-top:34px}.hero h1{font-size:30px}}