:root{--bg:#fff;--fg:#1d1d1f;--muted:#6e6e73;--faint:#86868b;--line:#d2d2d7;--soft:#f5f5f7;--code:#f5f5f7;--accent:#0066cc;--side:#fff;--sel:#e8e8ed;--pill:#fff;
--kw:#ad3da4;--ty:#703daa;--str:#d12f1b;--num:#272ad8;--com:#707f8c;--fn:#3e8087}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#000;--fg:#f5f5f7;--muted:#a1a1a6;--faint:#86868b;--line:#424245;--soft:#1d1d1f;--code:#1d1d1f;--accent:#2997ff;--side:#000;--sel:#333336;--pill:#4a4a4e;
--kw:#ff7ab2;--ty:#dabaff;--str:#ff8170;--num:#d9c97c;--com:#7f8c98;--fn:#67b7a4;color-scheme:dark}}
:root[data-theme=dark]{--bg:#000;--fg:#f5f5f7;--muted:#a1a1a6;--faint:#86868b;--line:#424245;--soft:#1d1d1f;--code:#1d1d1f;--accent:#2997ff;--side:#000;--sel:#333336;--pill:#4a4a4e;
--kw:#ff7ab2;--ty:#dabaff;--str:#ff8170;--num:#d9c97c;--com:#7f8c98;--fn:#67b7a4;color-scheme:dark}
*{box-sizing:border-box}html,body{margin:0}
body{font:17px/1.47 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",sans-serif;background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
/* top bar */
.top{height:52px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:24px;padding:0 22px;position:sticky;top:0;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(180%) blur(20px);z-index:2}
.top .brand{font-weight:600;color:var(--fg);font-size:21px;letter-spacing:-.01em;white-space:nowrap}
.narrow{display:none!important}.side .filter .narrow{margin-top:10px}.top a{font-size:14px;color:var(--fg)}.top .sp{flex:1}
.theme{display:inline-flex;gap:2px;padding:2px;border-radius:999px;background:var(--soft);border:1px solid var(--line)}
.theme button{display:grid;place-items:center;width:28px;height:24px;border:0;border-radius:999px;background:none;color:var(--muted);cursor:pointer;transition:background .2s,color .2s}
.theme button:hover{color:var(--fg)}.theme button[aria-pressed=true]{background:var(--pill);color:var(--fg);box-shadow:0 1px 3px rgba(0,0,0,.15)}
.theme button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.searchbtn{display:flex;align-items:center;gap:8px;height:32px;padding:0 8px 0 10px;border:1px solid var(--line);border-radius:8px;background:var(--soft);color:var(--muted);font:14px -apple-system,sans-serif;cursor:pointer;min-width:200px}
.searchbtn span{flex:1;text-align:left}.searchbtn kbd{font:12px -apple-system,sans-serif;border:1px solid var(--line);border-radius:4px;padding:0 5px;background:var(--bg)}
.searchbtn:hover{color:var(--fg)}.searchbtn:focus-visible{outline:2px solid var(--accent)}
dialog.search{width:min(680px,calc(100vw - 24px));margin:12vh auto 0;padding:0;border:1px solid color-mix(in srgb,var(--line) 70%,transparent);border-radius:18px;
background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(180%) blur(30px);-webkit-backdrop-filter:saturate(180%) blur(30px);color:var(--fg);
box-shadow:0 24px 80px rgba(0,0,0,.28),0 2px 8px rgba(0,0,0,.08);overflow:hidden}
dialog.search[open]{animation:pop .16s ease-out}@keyframes pop{from{opacity:0;transform:scale(.97) translateY(-6px)}}
dialog.search::backdrop{background:rgba(0,0,0,.18)}
.sbar{display:flex;align-items:center;gap:12px;padding:0 18px;height:60px}.sbar svg{width:22px;height:22px;color:var(--muted);flex:none}
.sbar input{flex:1;min-width:0;border:0;outline:0;background:none;color:var(--fg);font:400 22px -apple-system,BlinkMacSystemFont,sans-serif;letter-spacing:-.01em}
.sbar input::-webkit-search-cancel-button{display:none}.sbar input::placeholder{color:var(--faint)}
.sbar kbd{font:500 11px -apple-system,sans-serif;color:var(--muted);border:1px solid var(--line);border-radius:5px;padding:2px 6px}
#sres{max-height:min(460px,60vh);overflow:auto;padding:0 8px}#sres:not(:empty){border-top:1px solid var(--line);padding:8px}
#sres .hit{display:flex;gap:12px;align-items:flex-start;padding:9px 12px;border-radius:10px;color:var(--fg)}
#sres .hit:hover{text-decoration:none}#sres .hit.sel{background:var(--accent);color:#fff}
#sres .hit .ic{margin-top:3px}#sres .hit.sel .ic{border-color:rgba(255,255,255,.8);color:#fff}
#sres .t{display:block;font-weight:600;font-size:15px}#sres .t i{font-style:normal;font-weight:400;color:var(--muted)}
#sres .x{display:block;font-size:13px;line-height:1.4;color:var(--muted);overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
#sres mark{background:none;color:inherit;font-weight:600}#sres .hit.sel .t i,#sres .hit.sel .x{color:rgba(255,255,255,.85)}
.scancel{display:none;border:0;background:none;color:var(--accent);font:17px -apple-system,sans-serif;padding:8px 0 8px 4px;cursor:pointer}
#sres .msg{padding:22px 12px;text-align:center;color:var(--muted);font-size:14px}
.top .ver{margin-left:-12px;font-size:12px;font-weight:500;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:1px 8px}.top .ver:hover{text-decoration:none;color:var(--fg)}
.skip{position:absolute;left:-9999px;top:8px;z-index:9;padding:8px 12px;border-radius:8px;background:var(--bg);color:var(--accent);border:1px solid var(--line)}.skip:focus{left:12px}
a:focus-visible,.side input:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
@media(max-width:359px){.top .ver{display:none}}
main{view-transition-name:content}::view-transition-old(content),::view-transition-new(content){animation-duration:.14s}
::view-transition-old(root),::view-transition-new(root){animation:none}
@media (prefers-reduced-motion:reduce){*,*::before,*::after,::backdrop{transition:none!important;animation:none!important}}
/* sidebar */
.sidetoggle{display:grid;place-items:center;width:32px;height:32px;margin-left:-6px;border:0;border-radius:8px;background:none;color:var(--fg);cursor:pointer}
.sidetoggle:hover{background:var(--soft)}.sidetoggle:focus-visible{outline:2px solid var(--accent)}.sidetoggle svg{width:19px;height:19px}
.side{transition:margin-left .25s ease,visibility .25s}.noside .side{margin-left:-321px;visibility:hidden}
#tree[hidden]{display:none}.side .none{color:var(--muted);padding:5px 10px;margin:0}
.wrap{display:flex;min-height:calc(100vh - 52px)}
.side{width:320px;flex:none;border-right:1px solid var(--line);background:var(--side);position:sticky;top:52px;height:calc(100vh - 52px);display:flex;flex-direction:column;font-size:15px}
.side .scroll{flex:1;overflow:auto;padding:14px 12px 20px}
.side h4{margin:14px 10px 4px;font-size:15px;font-weight:600;color:var(--muted)}#tree h4:first-child{margin-top:4px}
.side a{display:flex;align-items:center;gap:8px;padding:5px 10px;border-radius:8px;color:var(--fg);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.side a:hover{text-decoration:none;background:var(--soft)}.side a.on{background:var(--sel);font-weight:600}
.ic{flex:none;display:inline-grid;place-items:center;width:15px;height:15px;border:1px solid var(--faint);border-radius:4px;font:600 10px/1 -apple-system,sans-serif;color:var(--faint)}
.side .filter{border-top:1px solid var(--line);padding:12px}
.side input{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);font-size:15px}
.side input:focus{outline:2px solid var(--accent);outline-offset:-1px}
/* page */
main{flex:1;min-width:0}
.hero,.content{max-width:920px;padding-left:80px;padding-right:80px}
.hero{padding-top:44px}.hero,.content{overflow-wrap:break-word}
.crumbs{font-size:15px;color:var(--muted);margin-bottom:22px;overflow-wrap:anywhere}.crumbs a{color:var(--fg);text-decoration:underline;text-underline-offset:2px}.crumbs i{font-style:normal;margin:0 6px}
.eyebrow{color:var(--muted);font-size:21px;font-weight:500;margin-bottom:6px}
.hero h1{font-size:44px;line-height:1.08;margin:0 0 14px;font-weight:700;letter-spacing:-.015em;overflow-wrap:anywhere}
.abstract{font-size:21px;line-height:1.38;margin:0 0 14px;font-weight:500}
.avail{font-size:15px;color:var(--fg);margin-bottom:8px}.avail span+span::before{content:"|";color:var(--faint);margin:0 10px}
.content{padding-top:12px;padding-bottom:72px}
h2{font-size:34px;line-height:1.1;margin:48px 0 20px;padding-top:44px;border-top:1px solid var(--line);font-weight:700;letter-spacing:-.01em}
h2.first{border-top:0;padding-top:0;margin-top:16px}
h3{font-size:24px;margin:34px 0 14px;font-weight:600}
p{margin:0 0 16px}
code{font:.88em "SF Mono",ui-monospace,Menlo,monospace}p code,li code,td code{color:var(--fg)}:not(pre)>code{overflow-wrap:anywhere}
pre{background:var(--code);padding:14px 16px;border-radius:15px;overflow:auto;font-size:15px;line-height:1.66;margin:0 0 24px}
pre code{font-size:15px}.decl{margin:24px 0 0}
/* syntax colours (Xcode-like) */
code .k,code .m{color:var(--kw)}code .t{color:var(--ty)}code .s{color:var(--str)}code .n{color:var(--num)}code .c{color:var(--com);font-style:italic}
/* topics */
.topic{padding:0 0 18px}
.topic .sig{font:15px/1.6 "SF Mono",ui-monospace,Menlo,monospace;color:var(--muted);overflow-wrap:anywhere}.topic .sig b{font-weight:400;color:var(--accent)}
.topic .meta{color:var(--fg);font-size:16px;margin:2px 0 0 40px}.topic .meta code{color:var(--muted)}
table{border-collapse:collapse;width:100%;margin:12px 0 24px;font-size:15px}th,td{border-bottom:1px solid var(--line);padding:9px 8px;text-align:left;vertical-align:top}th{font-weight:600}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(260px,100%),1fr));gap:4px 16px;margin:16px 0}.grid>a{min-width:0;overflow-wrap:anywhere}
.card{display:block;border:1px solid var(--line);border-radius:16px;padding:18px 20px;transition:border-color .2s}.card:hover{text-decoration:none;border-color:var(--faint)}
.card b{display:block;margin-bottom:4px;color:var(--fg)}.card span{color:var(--muted);font-size:14px}
.grid:has(.card){gap:14px}
#results a{padding:5px 10px}
footer{color:var(--muted);font-size:13px;padding:22px 80px;background:var(--soft);border-top:1px solid var(--line)}
@media(max-width:820px){table{display:block;overflow-x:auto}
dialog.search{width:100vw;max-width:100vw;height:100dvh;max-height:100dvh;margin:0;border:0;border-radius:0;background:var(--bg)}
.sbar{height:56px;padding:0 14px}.sbar input{font-size:18px}.sbar kbd{display:none}.scancel{display:block}
#sres{max-height:calc(100dvh - 56px)}#sres .x{-webkit-line-clamp:3}.wide{display:none!important}.narrow{display:flex!important}.top{gap:10px;padding:0 12px}.top .brand{font-size:18px}.top .ver{margin-left:-4px}
.side .filter .narrow{justify-content:center}.searchbtn{min-width:0}.searchbtn span,.searchbtn kbd{display:none}.side{position:fixed;left:0;z-index:3;margin-left:-321px;visibility:hidden;box-shadow:0 10px 30px rgba(0,0,0,.2)}.mside .side{margin-left:0;visibility:visible}.hero,.content,footer{padding-left:20px;padding-right:20px}.hero h1{font-size:34px}}