@font-face{font-family:"Bricolage";src:url(fonts/bricolage-grotesque-latin-800-normal.woff2) format("woff2");font-weight:800;font-display:block}
@font-face{font-family:"Bricolage";src:url(fonts/bricolage-grotesque-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"JBMono";src:url(fonts/jetbrains-mono-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
:root{
  --paper:#F3EFE7; --ink:#1B1A17; --muted:#5B574F; --line:#D9D2C4; --card:#FBF9F4;
  --heat:#B03A0A; --cool:#0F6B4C;
  --p3:36.1%; --p45:49.4%; --p7:63.9%;
  --sans:"Bricolage",ui-sans-serif,system-ui,sans-serif; --mono:"JBMono",ui-monospace,monospace;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--paper);color:var(--ink);font:400 16px/1.45 var(--sans);overflow-x:hidden}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.top{display:flex;align-items:baseline;gap:24px;padding:18px clamp(16px,3vw,40px) 12px;flex-wrap:wrap}
.mark{margin:0;font-weight:800;font-size:18px;display:flex;align-items:center;gap:6px;letter-spacing:-.01em}
.top h1{margin:0;font-weight:400;font-size:16px;color:var(--muted)}
.top h1 em{font-style:normal;color:var(--heat);font-weight:800}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:clamp(16px,2vw,28px);padding:0 clamp(16px,3vw,40px) 20px;align-items:start}
.stage{position:sticky;top:16px;border-radius:18px;overflow:hidden;box-shadow:0 1px 0 var(--line),0 18px 40px -24px rgba(27,26,23,.35);min-width:0}
#melt{display:block;width:100%;height:min(72vh,640px);min-height:420px;touch-action:pan-y;cursor:ew-resize;outline:none}
#melt:focus-visible{box-shadow:inset 0 0 0 3px var(--ink),inset 0 0 0 6px #fff}
.hint{position:absolute;left:16px;top:14px;margin:0;padding:6px 12px;border-radius:999px;background:var(--ink);color:#fff;font:500 13px/1.2 var(--mono);pointer-events:none;transition:opacity .4s}
.hint span{display:inline-block;animation:nudge 1.4s ease-in-out infinite}
.hint span:last-child{animation-direction:reverse}
@keyframes nudge{50%{transform:translateX(-3px)}}
.hint.gone{opacity:0}
.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px 18px 16px;display:flex;flex-direction:column;gap:14px;min-width:0}
.readout{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.ratio{margin:0;font:500 52px/1 var(--mono);letter-spacing:-.04em}
.ratio small{font-size:22px;color:var(--muted)}
.state{margin:0;font-weight:800;font-size:19px;padding:6px 14px;border-radius:999px;background:var(--heat);color:#fff}
.state.set{background:var(--cool)}
.scale .track{position:relative;height:10px;border-radius:5px;background:linear-gradient(90deg,#E9C7B4 0 var(--p45),#C9DDD2 var(--p45));}
.scale .zone{position:absolute;left:var(--p3);width:calc(var(--p45) - var(--p3));top:0;bottom:0;background:#EBD9B9}
.scale b{position:absolute;top:-5px;width:4px;height:20px;border-radius:2px;background:var(--ink);left:0;transform:translateX(-2px);transition:left .12s linear}
.scale .ticks{position:relative;height:34px;font:500 12px/1.15 var(--mono);color:var(--muted)}
.scale .ticks span{position:absolute;left:var(--p);transform:translateX(-50%);text-align:center;top:6px}
.checks{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.checks li{display:grid;grid-template-columns:1fr auto 74px;gap:8px;padding:7px 0;border-bottom:1px solid var(--line);font-size:14px;align-items:center}
.checks .need{font:500 13px var(--mono);color:var(--muted)}
.checks .res{font-weight:800;text-align:right;color:var(--heat)}
.checks .res.ok{color:var(--cool)}
.actions{display:flex;gap:8px;flex-wrap:wrap}
button{font:inherit;font-size:14px;border:1px solid var(--ink);background:transparent;color:var(--ink);border-radius:10px;padding:9px 12px;cursor:pointer;min-height:44px}
button:hover{background:#ECE6DA}
button:focus-visible,input:focus-visible{outline:3px solid var(--ink);outline-offset:2px}
button.primary{background:var(--ink);color:#fff;font-weight:800}
button.primary small{font-weight:400;opacity:.9}
button.primary:hover{background:#34322D}
button[disabled]{opacity:.55;cursor:default}
.note{margin:-6px 0 0;min-height:1.3em;font-size:13px;color:var(--muted)}
fieldset.color{border:0;margin:0;padding:0;display:grid;grid-template-columns:44px 104px 1fr;gap:4px 10px;align-items:center}
fieldset.color legend{font-weight:800;font-size:14px;padding:0;margin-bottom:6px}
input[type=color]{width:44px;height:44px;border:1px solid var(--ink);border-radius:10px;padding:3px;background:#fff;cursor:pointer}
.hex input{width:100%;font:500 15px var(--mono);padding:10px 8px;border:1px solid var(--ink);border-radius:10px;background:#fff;color:var(--ink);text-transform:uppercase;min-height:44px}
.hex input[aria-invalid=true]{border-color:var(--heat);box-shadow:0 0 0 2px var(--heat)}
.err{grid-column:1/-1;margin:0;font-size:13px;font-weight:800;color:var(--heat)}
.err:empty{display:none}
.scale .ticks small{font-size:11px}
.light{display:flex;flex-direction:column;font-size:12px;color:var(--muted);min-width:0}
.light input{width:100%;accent-color:var(--ink);height:28px}
.presets .label{margin:0 0 6px;font-weight:800;font-size:14px}
.presets div{display:flex;flex-wrap:wrap;gap:6px}
.presets button{font-size:13px;padding:6px 10px;min-height:36px;border-color:var(--muted)}
.sample{display:flex;flex-direction:column;font-weight:800;font-size:14px;gap:4px}
.sample input{font:400 15px var(--sans);padding:10px;border:1px solid var(--ink);border-radius:10px;background:#fff;color:var(--ink);min-height:44px}
.css{display:flex;gap:8px;align-items:stretch}
.css pre{flex:1;margin:0;padding:10px 12px;border-radius:10px;background:var(--ink);color:#F3EFE7;font:500 12.5px/1.5 var(--mono);overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;min-width:0}
.foot{padding:4px clamp(16px,3vw,40px) 28px;color:var(--muted);font-size:13px;max-width:900px}
.foot p{margin:0}
@media (max-width:980px){
  .layout{grid-template-columns:1fr}
  .stage{position:relative;top:0}
  #melt{height:min(58vh,460px);min-height:320px}
}
@media (max-width:480px){
  .top{gap:6px 16px;padding-top:14px}
  .ratio{font-size:42px}
  #melt{height:52vh;min-height:300px;max-height:420px}
  fieldset.color{grid-template-columns:44px 96px 1fr}
  .css{flex-direction:column}
}
@media (prefers-reduced-motion:reduce){
  .hint span{animation:none}
  .scale b{transition:none}
}