/* StegoBench landing: warm paper, one ink, one accent, square corners, no gradients, no shadows. */
:root{
  --paper:#f2eee3;--panel:#f8f5ec;--ink:#1d1c19;--muted:#645f54;--rule:#d6d0c0;--strong:#1d1c19;
  --accent:#1f4d3a;--bad:#9c2f1d;--on-ink:#f2eee3;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
  --sans:"Segoe UI","Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
}
:root[data-theme=dark]{--paper:#171613;--panel:#1f1e1a;--ink:#ece8dc;--muted:#a09b8e;--rule:#37352e;--strong:#ece8dc;--accent:#8fc4a6;--bad:#e49484;--on-ink:#171613}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--paper:#171613;--panel:#1f1e1a;--ink:#ece8dc;--muted:#a09b8e;--rule:#37352e;--strong:#ece8dc;--accent:#8fc4a6;--bad:#e49484;--on-ink:#171613}}
*,*::before,*::after{box-sizing:border-box;border-radius:0}
html{scroll-behavior:auto;scroll-padding-top:72px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit}
img{max-width:100%;display:block}
code,.mono{font-family:var(--mono);font-size:.88em}
.container{width:100%;max-width:1120px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--on-ink);padding:8px 12px;z-index:200}
.skip:focus{left:8px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:var(--paper);border-bottom:1px solid var(--rule)}
.hdr-inner{max-width:1120px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:baseline;gap:10px;text-decoration:none}
.wm{font:700 22px/1 var(--serif);letter-spacing:-.01em;color:var(--strong)}
.ver{font:12px var(--mono);color:var(--muted)}
.nav{display:flex;align-items:center;gap:22px;margin-left:auto}
.nav a{font-size:14.5px;text-decoration:none;color:var(--muted)}
.nav a:hover{color:var(--strong);text-decoration:underline;text-underline-offset:5px}
.nav a.active{color:var(--strong);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:7px}
.nav .nav-cta{background:var(--ink);color:var(--on-ink);padding:8px 14px;font-weight:600;text-decoration:none}
.nav .nav-cta:hover{background:var(--accent);color:var(--on-ink);text-decoration:none}
.hdr-actions{display:flex;gap:8px}
.txt-btn{font:13px var(--mono);background:transparent;color:var(--ink);border:1px solid var(--rule);padding:6px 10px;cursor:pointer}
.txt-btn:hover{border-color:var(--ink)}
.menu-btn{display:none}

/* type */
.kicker{font:12px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}
h1,h2,h3{font-family:var(--serif);color:var(--strong);margin:0}
h1{font-weight:400;font-size:clamp(32px,min(5.2vw,8.4vh),66px);line-height:1.08;letter-spacing:-.012em}
h1 em{font-style:italic;color:var(--accent)}
h2{font-weight:400;font-size:clamp(28px,3.2vw,40px);line-height:1.12;letter-spacing:-.01em}
h3{font-family:var(--sans);font-weight:700;font-size:17px;line-height:1.3}
.lead{font-size:clamp(16px,2.4vh,19px);color:var(--muted);max-width:30em;margin:22px 0 0}
.fineprint{font:12.5px var(--mono);color:var(--muted);margin:22px 0 0}

/* buttons: square, solid, no hover animation */
.btn{display:inline-block;background:var(--ink);color:var(--on-ink);padding:12px 20px;font-weight:600;text-decoration:none;border:1px solid var(--ink)}
.btn:hover{background:var(--accent);border-color:var(--accent)}
.link{margin-left:22px;font-weight:600;text-underline-offset:5px}
.link:hover{color:var(--accent)}
.cta-row{margin-top:clamp(18px,3.6vh,30px);display:flex;align-items:center;flex-wrap:wrap;gap:8px}

/* hero */
.hero{padding:clamp(16px,4vh,56px) 0 0}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:clamp(28px,4vw,56px);align-items:center;min-height:calc(100vh - 64px - clamp(16px,4vh,56px));min-height:calc(100svh - 64px - clamp(16px,4vh,56px))}

/* live demo */
.demo{border:1px solid var(--ink);background:var(--panel);padding:clamp(12px,2.2vh,18px)}
.demo-head{display:flex;justify-content:space-between;gap:12px;font:12px var(--mono);color:var(--muted);border-bottom:1px solid var(--rule);padding-bottom:12px;margin-bottom:14px}
.demo-head b{color:var(--strong);font-weight:600;text-transform:uppercase;letter-spacing:.06em}
.demo-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.demo-controls label{display:flex;flex-direction:column;gap:5px;font:12px var(--mono);color:var(--muted)}
.demo-controls .wide{grid-column:1/-1}
.demo select,.demo input[type=text]{font:14px var(--sans);color:var(--ink);background:var(--paper);border:1px solid var(--rule);padding:8px 10px;width:100%}
.demo select:focus,.demo input:focus{border-color:var(--ink)}
.demo input[type=range]{width:100%;accent-color:var(--accent)}
.demo output{color:var(--strong);font-weight:600}
.demo-imgs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:clamp(10px,2vh,16px)}
.demo figure{margin:0}
.demo canvas{width:min(100%,calc(clamp(96px,24vh,260px) * 1.3333));height:auto;aspect-ratio:4/3;display:block;border:1px solid var(--rule);background:var(--rule)}
.demo figcaption{font:11.5px var(--mono);color:var(--muted);margin-top:6px}
.demo-out{margin-top:16px;border-top:1px solid var(--rule);padding-top:12px}
.demo-out .lab{font:11.5px var(--mono);color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
#demoText{font:600 18px/1.4 var(--mono);margin:6px 0 4px;min-height:26px;word-break:break-all;color:var(--strong)}
#demoText.good{color:var(--accent)}#demoText.bad{color:var(--bad)}
.stat{font:12.5px var(--mono);color:var(--muted)}
.skel-line,.skel{background:var(--rule);animation:sbSkel 1.3s ease-in-out infinite}
.skel-line{height:22px;width:70%}
@keyframes sbSkel{0%,100%{opacity:.45}50%{opacity:1}}

/* facts */
.facts{list-style:none;margin:clamp(24px,5vh,56px) 0 0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.facts li{padding:22px 20px 22px 0;display:flex;flex-direction:column;gap:2px}
.facts li+li{padding-left:20px;border-left:1px solid var(--rule)}
.facts strong{font:400 48px/1 var(--serif);color:var(--strong)}
.facts small{font:13px var(--mono);color:var(--muted)}
.facts span{font-size:14px;color:var(--muted)}

/* sections */
.section{padding:84px 0}
.section.alt{background:var(--panel);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.sec-head{max-width:680px;margin-bottom:40px}
.sec-head .sub{color:var(--muted);margin:14px 0 0}
.rows{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.rows li{display:grid;grid-template-columns:72px 1fr;gap:12px;padding:22px 0;border-bottom:1px solid var(--rule)}
.rows .num{font:400 40px/1 var(--serif);color:var(--muted)}
.rows p{margin:6px 0 0;color:var(--muted);max-width:52em}
.rows.two{display:grid;grid-template-columns:1fr 1fr;column-gap:56px}
.rows.two li:nth-child(-n+2){border-top:0}

/* table */
.table-wrap{overflow-x:auto;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}
.mx{width:100%;border-collapse:collapse;min-width:760px;font-size:14.5px}
.mx th,.mx td{text-align:left;padding:13px 14px;border-bottom:1px solid var(--rule)}
.mx thead th{font:600 12px var(--sans);color:var(--muted);letter-spacing:.02em;border-bottom:1px solid var(--ink)}
.mx tbody th{font-weight:600;color:var(--strong)}
.mx tbody tr:last-child>*{border-bottom:0}
.mx td.n{font-family:var(--mono);font-size:13.5px}
.mx .hi{color:var(--accent);font-weight:700}.mx .lo{color:var(--bad)}.mx td.ok{color:var(--accent)}.mx td.lo{color:var(--bad)}
.note{color:var(--muted);max-width:46em;margin:18px 0 0;font-size:14.5px}

/* footer */
.site-footer{border-top:1px solid var(--ink);padding:56px 0 28px}
.foot-top{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px}
.foot-brand p{color:var(--muted);max-width:26em;margin:14px 0 22px}
.devs h2{font:12px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.dev-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.dev{display:flex;justify-content:space-between;align-items:baseline;gap:16px;padding:16px 0;border-bottom:1px solid var(--rule)}
.dev b{font:400 24px/1.2 var(--serif);color:var(--strong)}
.dev a{font:13.5px var(--mono);color:var(--accent);text-underline-offset:4px}
.dev a:hover{color:var(--strong)}
.foot-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:48px;padding-top:18px;border-top:1px solid var(--rule);font-size:13.5px;color:var(--muted)}
.foot-bottom nav{display:flex;gap:20px;flex-wrap:wrap}
.foot-bottom a{text-underline-offset:4px}.foot-bottom a:hover{color:var(--strong)}

/* policy pages */
.doc{max-width:720px;padding-top:56px;padding-bottom:72px}
.doc h1{font-size:44px;margin-bottom:18px}.doc h2{font-size:24px;margin:34px 0 8px}.doc p{color:var(--muted);margin:0 0 12px}
.docpage .nav{margin-left:auto}

/* reveal: opacity only */
.js .reveal{opacity:0}
.js .reveal.in{opacity:1;transition:opacity .5s ease}
@media (prefers-reduced-motion:reduce){.js .reveal{opacity:1}.skel-line,.skel{animation:none}}

@media (max-width:900px){
  .hero-grid{min-height:0;align-items:start}
  .demo canvas{width:100%}
  .hero-grid,.foot-top{grid-template-columns:1fr;gap:36px}
  .facts{grid-template-columns:1fr 1fr}.facts li:nth-child(3){padding-left:0;border-left:0}.facts li:nth-child(n+3){border-top:1px solid var(--rule)}
  .rows.two{grid-template-columns:1fr}.rows.two li:nth-child(2){border-top:1px solid var(--rule)}
  .menu-btn{display:inline-block}
  .nav{display:none;position:absolute;left:0;right:0;top:64px;background:var(--paper);border-bottom:1px solid var(--rule);flex-direction:column;align-items:flex-start;gap:0;padding:8px 24px 16px}
  .nav.open,.nav.open-always{display:flex}
  .nav a{padding:10px 0;width:100%}.nav .nav-cta{width:auto;margin-top:8px}
  .hdr-actions{margin-left:auto}.docpage .nav.open-always{position:static;flex-direction:row;border:0;padding:0;gap:18px}
  .docpage .hdr-inner{gap:12px}
}
@media print{.site-header,.hdr-actions,.demo{display:none}.js .reveal{opacity:1}}

/* short windows (browser zoomed in): tighten the live test so it still fits on one screen */
@media (max-height:660px){
  .demo-head{padding-bottom:8px;margin-bottom:8px}
  .demo canvas{width:min(100%,calc(clamp(72px,17vh,260px) * 1.3333))}
  .demo-controls{gap:8px}.demo select,.demo input[type=text]{padding:5px 8px}
  .demo-out{margin-top:8px;padding-top:8px}
  #demoText{font-size:15px;min-height:20px;margin:3px 0}
  .fineprint{display:none}
  .demo figcaption{margin-top:3px}
}
@media (max-height:520px){.demo-head{display:none}.demo canvas{width:min(100%,85px)}.lead{margin-top:12px}}