:root{
  --bg:#ffffff;--fg:#1a1f2b;--muted:#5b6472;--border:#e6e8ec;--card:#f7f8fa;
  --accent:#3f5f9e;--accent-ink:#2c4a80;--maxw:1080px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
/* OS dark — unless the visitor forced light via the toggle */
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0f1319;--fg:#e6e9ef;--muted:#9aa4b2;--border:#232a35;--card:#161b23;
  --accent:#8aa8dc;--accent-ink:#a9c1ea;}}
/* manual override via the toggle */
:root[data-theme="dark"]{
  --bg:#0f1319;--fg:#e6e9ef;--muted:#9aa4b2;--border:#232a35;--card:#161b23;
  --accent:#8aa8dc;--accent-ink:#a9c1ea;}
.themebtn{background:none;border:1px solid var(--border);border-radius:8px;color:var(--muted);
  cursor:pointer;font-size:.95rem;line-height:1;padding:6px 9px;margin-left:22px}
.themebtn:hover{color:var(--fg);border-color:var(--accent)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font);line-height:1.62;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
/* header/footer */
header.site{position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);z-index:10}
header.site .bar{display:flex;align-items:center;justify-content:space-between;height:60px;max-width:1180px;margin:0 auto;padding:0 20px}
.brand{font-weight:700;letter-spacing:-.01em;font-size:1.05rem;color:var(--fg)}
.brand .reg{color:var(--accent)}
nav.top a{color:var(--muted);margin-left:22px;font-size:.93rem}
nav.top a:hover{color:var(--fg);text-decoration:none}
footer.site{border-top:1px solid var(--border);color:var(--muted);font-size:.86rem;padding:24px 20px 48px;margin-top:40px}
footer.site .fwrap{max-width:1180px;margin:0 auto;display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between}
.privacy-note{font-size:.82rem}
/* home */
.hero{padding:76px 0 52px;border-bottom:1px solid var(--border)}
.hero h1{font-size:2.15rem;line-height:1.22;letter-spacing:-.02em;max-width:20ch;margin:.1em 0 .5em}
.hero p.lead{font-size:1.12rem;color:var(--muted);max-width:56ch;margin:0}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.72rem;color:var(--accent);font-weight:600;margin:0 0 .4em}
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:48px 0}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px}
.card h3{margin:.1em 0 .3em;font-size:1.02rem}
.card p{margin:0;color:var(--muted);font-size:.92rem}
.kbsec{padding:8px 0 8px}
.kbsec h2{font-size:1.4rem;letter-spacing:-.01em;margin:0 0 .2em}
.kbsec .sub{color:var(--muted);margin:0 0 22px}
.kbgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.kbgrid a{display:block;border:1px solid var(--border);border-radius:10px;padding:14px 16px;color:var(--fg)}
.kbgrid a:hover{border-color:var(--accent);text-decoration:none}
.kbgrid a b{display:block;color:var(--accent-ink)}
.kbgrid a span{color:var(--muted);font-size:.86rem}
/* KB docs layout */
.layout{display:grid;grid-template-columns:260px minmax(0,1fr);max-width:1180px;margin:0 auto}
aside.kb{border-right:1px solid var(--border);padding:26px 18px;min-height:calc(100vh - 60px)}
aside.kb .grp{font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin:18px 0 6px}
aside.kb a{display:block;color:var(--fg);padding:5px 10px;border-radius:7px;font-size:.92rem}
aside.kb a:hover{background:var(--card);text-decoration:none}
aside.kb a.active{background:color-mix(in srgb,var(--accent) 16%,transparent);color:var(--accent-ink);font-weight:600}
main.doc{padding:30px 40px 50px;max-width:820px}
.crumb{color:var(--muted);font-size:.85rem;margin-bottom:10px}
.doc h1{font-size:1.9rem;letter-spacing:-.02em;margin:.1em 0 .35em}
.doc>p:first-of-type{color:var(--muted);font-size:1.05rem}
.doc h2{font-size:1.2rem;margin:32px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--border)}
.doc h3{font-size:1.02rem;margin:22px 0 6px}
.doc ul{padding-left:1.1rem}
.doc li{margin:.28em 0}
.doc table{border-collapse:collapse;width:100%;font-size:.92rem;margin:12px 0;display:block;overflow-x:auto}
.doc th,.doc td{border:1px solid var(--border);padding:7px 10px;text-align:left}
.doc th{background:var(--card)}
.doc code{font-family:var(--mono);font-size:.88em;background:var(--card);padding:.1em .35em;border-radius:5px}
.doc hr{border:0;border-top:1px solid var(--border);margin:26px 0}
@media (max-width:820px){.layout{grid-template-columns:1fr}aside.kb{display:none}main.doc{padding:24px 20px 50px}
  .pillars{grid-template-columns:1fr 1fr}.kbgrid{grid-template-columns:1fr}.hero h1{font-size:1.7rem}}
/* KB search + mobile sidebar toggle */
.kbsearch{width:100%;padding:8px 10px;margin-bottom:12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--fg);font:inherit;font-size:.9rem}
.kbsearch:focus{outline:2px solid color-mix(in srgb,var(--accent) 40%,transparent);border-color:var(--accent)}
.kbres a{display:block;color:var(--fg);padding:6px 10px;border-radius:7px;font-size:.9rem}
.kbres a:hover{background:var(--card);text-decoration:none}
.kbres a span{color:var(--muted);font-size:.72rem;margin-left:6px}
.kbres .nohit{color:var(--muted);font-size:.88rem;padding:6px 10px}
/* site-wide header search */
.hsearch{position:relative;display:inline-block;margin-left:22px;vertical-align:middle}
.hsearch input{width:160px;padding:6px 10px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--fg);font:inherit;font-size:.86rem;transition:width .15s}
.hsearch input:focus{outline:2px solid color-mix(in srgb,var(--accent) 40%,transparent);border-color:var(--accent);width:220px}
.hdrres{position:absolute;top:calc(100% + 8px);right:0;width:360px;max-width:82vw;max-height:70vh;overflow:auto;background:var(--bg);border:1px solid var(--border);border-radius:10px;box-shadow:0 10px 34px rgba(0,0,0,.20);padding:6px;z-index:30}
.hdrres a{display:block;color:var(--fg);padding:8px 10px;border-radius:7px;font-size:.9rem}
.hdrres a:hover{background:var(--card);text-decoration:none}
.hdrres a b{font-weight:600}
.hdrres a .g{color:var(--muted);font-size:.72rem;margin-left:6px;font-weight:400}
.hdrres a .sn{display:block;color:var(--muted);font-size:.78rem;margin-top:3px;line-height:1.35}
.hdrres mark{background:color-mix(in srgb,var(--accent) 32%,transparent);color:inherit;padding:0 1px;border-radius:2px}
.hdrres .nohit{color:var(--muted);font-size:.88rem;padding:8px 10px}
@media (max-width:820px){.hsearch input{width:120px}.hsearch input:focus{width:150px}.hdrres{width:300px}}
.kbtoggle{display:none}
@media (max-width:820px){
  .kbtoggle{display:inline-block;margin:0 0 14px;background:var(--card);border:1px solid var(--border);border-radius:8px;padding:8px 12px;color:var(--fg);font:inherit;cursor:pointer}
  body.kb-open aside.kb{display:block;position:fixed;inset:60px 0 0 0;z-index:20;overflow:auto;background:var(--bg);padding:20px}
}