/* Fixed left category rail (docs/reference style) with the content column on the right. */
:root{--bg:#fff;--fg:#1a1d21;--mut:#5a6470;--line:#dfe3e8;--acc:#0a5cc2;--card:#f4f6f8;--warn:#a66b00;--on-acc:#fff;--rail:#f4f6f8;--sel:#e6eefb}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0f1317;--fg:#e4e8ec;--mut:#98a3af;--line:#252c34;--acc:#e8a05a;--card:#151a20;--warn:#e3b341;--on-acc:#0f1317;--rail:#12171c;--sel:#2b2118;color-scheme:dark}}
:root[data-theme=dark]{--bg:#0f1317;--fg:#e4e8ec;--mut:#98a3af;--line:#252c34;--acc:#e8a05a;--card:#151a20;--warn:#e3b341;--on-acc:#0f1317;--rail:#12171c;--sel:#2b2118;color-scheme:dark}
:root[data-theme=light]{color-scheme:light}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--fg);display:grid;grid-template-columns:15rem minmax(0,1fr);grid-template-rows:1fr auto;grid-template-areas:"rail main" "rail foot";min-height:100vh}
a{color:var(--acc);text-underline-offset:.15em}
.top{grid-area:rail;position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--rail);border-right:1px solid var(--line)}
.top .wrap{display:flex;flex-direction:column;padding:1.1rem .8rem 1rem}
.logo{font-weight:700;font-size:1.05rem;text-decoration:none;color:var(--fg);padding:0 .6rem .9rem;line-height:1.25}
.top nav{display:flex;flex-direction:column;gap:1px}
.top nav a{font-size:.9rem;padding:.3rem .6rem;border-radius:5px;color:var(--fg);text-decoration:none}
.top nav a:hover{background:var(--sel);color:var(--acc)}
.top .wrap{min-height:100%}
.theme{order:9;margin-top:auto;padding:1.2rem .6rem 0;display:flex;align-items:center;gap:.6rem;font-size:.82rem;color:var(--mut)}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{border:0;border-radius:0;background:var(--bg);color:var(--fg);padding:.3rem .75rem;font-size:.85rem;cursor:pointer}
.seg button+button{border-left:1px solid var(--line)}
.seg button[aria-pressed=true]{background:var(--acc);color:var(--on-acc);font-weight:600}
main.wrap{grid-area:main;width:100%;max-width:52rem;padding:0 2.5rem}
footer{grid-area:foot;border-top:1px solid var(--line);margin:3rem 0 0;padding:1.2rem 2.5rem 2rem;font-size:.85rem;color:var(--mut)}
footer .wrap{max-width:52rem;padding:0}
h1{font-size:1.9rem;line-height:1.15;margin:1.4rem 0 .5rem;letter-spacing:-.02em}
h2{font-size:1.2rem;margin:2rem 0 .5rem}
h3{font-size:1.02rem;margin:1.2rem 0 .2rem}
.lead{font-size:1.08rem;color:var(--mut);margin:.2rem 0 1rem}
.crumbs{font-size:.82rem;color:var(--mut);margin-top:1.2rem}
.crumbs a{color:var(--mut)}
.muted{color:var(--mut);font-weight:400}
.conv{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:1rem 1.1rem;margin:1.1rem 0;display:grid;gap:.75rem;grid-template-columns:1fr auto 1fr;align-items:end}
.conv label{display:flex;flex-direction:column;font-size:.78rem;color:var(--mut);gap:.25rem;min-width:0}
.conv .v{grid-column:1/-1}
.conv .in{font-size:1.35rem;font-variant-numeric:tabular-nums}
input,select,button{font:inherit;padding:.5rem .6rem;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--fg);max-width:100%}
input:focus-visible,select:focus-visible,button:focus-visible,.top a:focus-visible{outline:2px solid var(--acc);outline-offset:1px}
button{cursor:pointer}
.out{grid-column:1/-1;font-size:1.35rem;font-weight:600;margin:.2rem 0 0;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.go{grid-column:1/-1;margin:0;font-size:.92rem}
table{border-collapse:collapse;width:100%;font-size:.94rem}
th,td{text-align:left;padding:.38rem .6rem;border-bottom:1px solid var(--line)}
th{font-size:.74rem;color:var(--mut);text-transform:uppercase;letter-spacing:.04em;background:var(--rail)}
td.n{font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.tables{display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(16rem,1fr))}
.badge{display:inline-block;font-size:.72rem;padding:.05rem .5rem;border:1px solid var(--line);border-radius:4px;color:var(--mut);margin:0 .3rem .3rem 0;text-decoration:none}
.meta{margin:.2rem 0}
.grid{display:grid;gap:.55rem;grid-template-columns:repeat(auto-fill,minmax(12rem,1fr));list-style:none;padding:0}
.grid a{display:block;padding:.55rem .8rem;border:1px solid var(--line);border-radius:6px;text-decoration:none;background:var(--card)}
.grid a:hover{border-color:var(--acc)}
.cols{columns:14rem;list-style:none;padding:0;margin:.5rem 0}
.cols li{break-inside:avoid;padding:.12rem 0}
.note{border-left:3px solid var(--warn);padding:.45rem .8rem;background:var(--card);font-size:.92rem}
.formula code{font:.95rem ui-monospace,"Cascadia Mono",Consolas,monospace;background:var(--card);padding:.3rem .6rem;border-radius:4px;border:1px solid var(--line);display:inline-block}
.search input{width:100%;max-width:30rem;display:block;margin-top:.25rem}
.copy{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.cp{padding:.35rem .75rem;font-size:.88rem}
.cp:disabled{opacity:.5;cursor:default}
.cp-num{background:var(--acc);color:var(--on-acc);border-color:var(--acc);font-weight:600}
.cp-msg{font-size:.85rem;color:var(--mut);overflow-wrap:anywhere}
.pills{list-style:none;padding:0;margin:.5rem 0;display:flex;flex-wrap:wrap;gap:.45rem}
.pill{display:inline-block;padding:.35rem .8rem;border-radius:6px;background:var(--sel);color:var(--acc);text-decoration:none;font-weight:600;font-size:.9rem}
.pill:hover,.pill:focus{outline:1px solid var(--acc)}
.summary{font-weight:600;margin:.4rem 0}
.sources{font-size:.85rem;color:var(--mut)}
@media(max-width:52rem){
  body{display:block}
  .top{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .top .wrap{flex-direction:row;flex-wrap:wrap;align-items:center;padding:.6rem 1rem}
  .logo{padding:0}
  .top .wrap{min-height:0}
  .theme{order:0;margin:0 0 0 auto;padding:0}
  .top nav{flex:1 0 100%;flex-direction:row;overflow-x:auto;white-space:nowrap;padding:.3rem 0}
  main.wrap{padding:0 1rem}
  footer{padding:1.2rem 1rem 2rem}
}
@media(max-width:34rem){.conv{grid-template-columns:1fr}.conv .swap{justify-self:start}h1{font-size:1.6rem}}