/* White paper, black ink, one magenta accent (focus, hover, the highlighted value).
   Blue and orange live only in the logo. Experiments use the same white theme (js/runtime.js). */
:root{
  --paper:#FFFFFF;
  --ink:#000000;
  --ink-2:#4D4D4D;
  --rule:#D9D9D9;
  --wash:#F4F4F4;
  --accent:#B3127A;
  --font:"Readex Pro","IBM Plex Sans Arabic",Tahoma,sans-serif;
  --gut:16px;
  --max:1200px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:15px;line-height:1.75;font-weight:400;display:flex;flex-direction:column;min-height:100vh}
[dir=ltr] body{line-height:1.6}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3,p{margin:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.skip{position:absolute;inset-inline-start:8px;top:-60px;background:var(--ink);color:var(--paper);padding:8px 14px;z-index:20;text-decoration:none}
.skip:focus{top:8px}
main{flex:1}
main:focus,main:focus-visible{outline:none}
.in{max-width:var(--max);margin:0 auto;padding:0 var(--gut)}
@media (min-width:900px){:root{--gut:32px}}

/* Header */
.top{position:sticky;top:0;z-index:10;background:var(--paper);border-bottom:1px solid var(--ink)}
.top-in{max-width:var(--max);margin:0 auto;padding:10px var(--gut);display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0}
.brand img{width:44px;height:44px;flex:none}
.brand-t{display:flex;flex-direction:column;min-width:0;line-height:1.35}
.brand-t b{font-weight:600;font-size:15px}
.brand-t span{font-size:13px;color:var(--ink-2)}
.top-nav{display:flex;align-items:center;gap:20px;flex:none}
.top-nav a{text-decoration:none;font-weight:500}
.top-nav a:hover{color:var(--accent)}
.lang{background:none;border:1px solid var(--ink);padding:5px 12px;min-height:36px;cursor:pointer;font-size:14px;font-family:"Readex Pro",sans-serif}
.lang:hover{background:var(--ink);color:var(--paper)}
@media (max-width:640px){
  .brand-t span{display:none}
  .brand-t b{font-size:14px}
  .top-nav a{display:none}
  .brand img{width:38px;height:38px}
}

/* Home: hero */
.hero{padding:48px 0 56px;border-bottom:1px solid var(--ink)}
.hero .in{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:48px;align-items:center}
@media (max-width:900px){.hero{padding:28px 0 36px}.hero .in{grid-template-columns:minmax(0,1fr);gap:28px}}
.hero h1{font-size:clamp(30px,5vw,48px);font-weight:600;line-height:1.25;letter-spacing:-.01em}
[dir=ltr] .hero h1{letter-spacing:-.02em}
.hero .lede{font-size:17px;color:var(--ink-2);margin-top:14px;max-width:44ch}

/* Search */
.search{margin-top:28px;position:relative}
.search label{display:block;font-weight:500;margin-bottom:8px}
.search input{width:100%;font:inherit;font-size:17px;padding:12px 14px;min-height:52px;border:2px solid var(--ink);border-radius:0;background:var(--paper);color:var(--ink)}
.search input::placeholder{color:#767676}
.search input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(179,18,122,.18)}
.results{list-style:none;margin:0;padding:0;border:2px solid var(--ink);border-top:0;max-height:min(60vh,420px);overflow:auto;background:var(--paper);position:absolute;inset-inline:0;top:100%;z-index:5}
.results[hidden]{display:none}
.results a{display:flex;justify-content:space-between;gap:12px;padding:10px 14px;text-decoration:none;border-top:1px solid var(--rule)}
.results li:first-child a{border-top:0}
.results a:hover,.results a[aria-selected=true]{background:var(--wash);color:var(--accent)}
.results small{color:var(--ink-2);font-size:13px;white-space:nowrap}
.results .none{padding:12px 14px;color:var(--ink-2)}

/* Hero instrument */
.demo{border:1px solid var(--ink);padding:20px;display:flex;flex-direction:column;gap:14px;background:var(--paper)}
.demo-h{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.demo-h h2{font-size:17px;font-weight:500}
.demo-h span{font-size:13px;color:var(--ink-2)}
.demo canvas{width:100%;height:240px;display:block}
.demo-ctl{display:grid;grid-template-columns:1fr auto;gap:4px 12px;align-items:baseline}
.demo-ctl label{font-weight:500;font-size:14px}
.demo-ctl output{font-family:"IBM Plex Mono",monospace;font-weight:500;direction:ltr}
.demo-ctl input{grid-column:1/-1;width:100%;accent-color:var(--ink);height:28px;margin:0}
.demo-f{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;border-top:1px solid var(--rule);padding-top:14px}
.demo-f p{font-size:13px;color:var(--ink-2);font-family:"IBM Plex Mono",monospace;direction:ltr}
.go{display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:var(--paper);text-decoration:none;font-weight:500;padding:10px 18px;min-height:44px}
.go:hover{background:var(--accent)}

/* Home: category rack */
.rack{padding:48px 0 64px}
.sec-h{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:20px}
.sec-h h2{font-size:28px;font-weight:600}
.sec-h p{color:var(--ink-2)}
.rack-l{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:48px}
@media (max-width:760px){.rack-l{grid-template-columns:minmax(0,1fr)}}
.rack-l a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 16px;padding:18px 0 20px;border-top:2px solid var(--ink);text-decoration:none}
.rack-l a:hover{border-top-color:var(--accent)}
.rack-l a:hover .rk-n{color:var(--accent)}
.rk-n{font-size:21px;font-weight:500;line-height:1.4}
.rk-c{font-size:28px;font-weight:300;line-height:1.2;font-variant-numeric:tabular-nums;grid-row:1/3;grid-column:2;align-self:start}
.rk-g{font-size:13px;color:var(--ink-2);line-height:1.6}

/* Breadcrumb + page heads */
.crumbs{padding:20px 0 0;font-size:14px;color:var(--ink-2)}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px 8px}
.crumbs li+li::before{content:"/";margin-inline-end:8px;color:var(--rule)}
.crumbs a{text-decoration:none;color:var(--accent)}
.crumbs a:hover{text-decoration:underline}
.page-h{padding:12px 0 28px}
.page-h h1{font-size:clamp(28px,4.4vw,40px);font-weight:600;line-height:1.3}
.page-h p{color:var(--ink-2);margin-top:8px;font-size:17px;max-width:70ch}

/* Category page */
.chips{position:sticky;top:65px;z-index:4;background:var(--paper);border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.chips ul{list-style:none;margin:0 auto;padding:10px var(--gut);max-width:var(--max);display:flex;gap:8px;overflow-x:auto;scrollbar-width:thin}
.chips a{display:block;white-space:nowrap;text-decoration:none;padding:6px 12px;border:1px solid var(--rule);font-size:14px}
.chips a:hover{border-color:var(--ink)}
.chips a[aria-current=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
@media (max-width:640px){.chips{top:59px}}
.group{padding:36px 0 8px;scroll-margin-top:130px}
.group h2{font-size:21px;font-weight:600;display:flex;gap:10px;align-items:baseline}
.group h2 small{font-size:15px;font-weight:300;color:var(--ink-2)}
.labs{list-style:none;margin:14px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:48px}
@media (max-width:760px){.labs{grid-template-columns:minmax(0,1fr)}}
.labs a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--rule);text-decoration:none;min-height:56px}
.labs a:hover .lb-ar{color:var(--accent)}
.lb{display:flex;flex-direction:column;min-width:0}
.lb-ar{font-weight:500;font-size:16px;line-height:1.5}
.lb-en{font-size:13px;color:var(--ink-2);line-height:1.5}
.tag{flex:none;font-size:12px;font-weight:500;border:1px solid var(--ink);padding:1px 7px;line-height:1.6}
.chev{flex:none;color:var(--ink-2)}
.labs a:hover .chev{color:var(--accent)}

/* Lab page */
.lab-h{display:flex;justify-content:space-between;align-items:flex-end;gap:16px 24px;flex-wrap:wrap;padding:12px 0 20px}
.lab-h h1{font-size:clamp(26px,4vw,36px);font-weight:600;line-height:1.3}
.lab-h .en{color:var(--ink-2);font-size:15px;margin-top:2px}
.lab-h .desc{color:var(--ink-2);font-size:16px;margin-top:10px;max-width:70ch}
.tools{display:flex;gap:8px;flex:none}
.tool{background:var(--paper);border:1px solid var(--ink);padding:7px 14px;min-height:40px;cursor:pointer;font-size:14px;display:inline-flex;align-items:center;gap:8px}
.tool:hover{background:var(--ink);color:var(--paper)}
.tool svg{width:16px;height:16px}
.stage{background:var(--paper);min-height:320px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}
.stage:fullscreen{overflow:auto;padding:16px 24px;background:var(--paper)}
.loading{color:var(--ink-2);padding:40px 20px;text-align:center}
.near{padding:40px 0 64px}
.near h2{font-size:21px;font-weight:600}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:28px}
.pn a{display:flex;flex-direction:column;padding:14px 0;border-top:2px solid var(--ink);text-decoration:none}
.pn a:hover{border-top-color:var(--accent);color:var(--accent)}
.pn small{color:var(--ink-2);font-size:13px}
.pn .next{text-align:end}
.toast{position:fixed;bottom:20px;inset-inline-start:50%;transform:translateX(50%);background:var(--ink);color:var(--paper);padding:10px 18px;font-size:14px;z-index:30}
[dir=ltr] .toast{transform:translateX(-50%)}
.toast[hidden]{display:none}
.empty{padding:64px 0}
.empty p{color:var(--ink-2);margin:8px 0 20px}

/* Footer */
.foot{border-top:1px solid var(--ink);margin-top:auto}
.foot-in{max-width:var(--max);margin:0 auto;padding:28px var(--gut) 36px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:16px 48px;align-items:start}
@media (max-width:760px){.foot-in{grid-template-columns:minmax(0,1fr)}}
.foot-brand{display:flex;gap:12px;align-items:center;line-height:1.4}
.foot-brand b{display:block;font-weight:600;font-size:14px}
.foot-brand span{font-size:13px;color:var(--ink-2)}
.credit{font-size:13px;color:var(--ink-2);max-width:72ch;align-self:center}

@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}