@font-face{font-family:Instrument;src:url('../../assets/fonts/instrument-sans-latin-400-normal.woff2') format('woff2');font-display:swap}
@font-face{font-family:Instrument;src:url('../../assets/fonts/instrument-sans-latin-600-normal.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:Anybody;src:url('../../assets/fonts/anybody-var.woff2') format('woff2');font-weight:100 900;font-display:swap}
@font-face{font-family:JetBrains;src:url('../../assets/fonts/jetbrains-mono-latin-400-normal.woff2') format('woff2');font-display:swap}
@font-face{font-family:JetBrains;src:url('../../assets/fonts/jetbrains-mono-latin-500-normal.woff2') format('woff2');font-weight:500;font-display:swap}

:root{--app-accent:#ff8a1f;--accent-text:#ff9d43;--bg:#0b1015;--panel:#111920;--raised:#1d2832;--line:#2b3741;--fg:#ecf0f2;--muted:#a3afb9;--soft:#7d8a95;
  --good:#71d8bd;--bad:#ff7a66;--l-same:#71d8bd;--l-close:#c9d66b;--l-visible:#ffb04a;--l-bad:#ff6b5c;--cool:#62d9ef;--err-zero:#161f28;--stage:#0a1117;--stage-line:#1d2a35;
  --font:Instrument,system-ui,sans-serif;--display:Anybody,system-ui,sans-serif;--mono:JetBrains,ui-monospace,monospace}
:root[data-theme=light]{--bg:#f4f2ee;--panel:#ffffff;--raised:#eeeae4;--line:#d8d3cb;--fg:#1b2933;--muted:#5c6870;--soft:#7a858c;--accent-text:#a64c00;
  --good:#167a62;--bad:#b8321f;--l-same:#168a6c;--l-close:#7d8a12;--l-visible:#c46a00;--l-bad:#c0331f;--cool:#0a84a0;--err-zero:#f1eee9;--stage:#f8f6f2;--stage-line:#e4ded5}

body{font-family:var(--font);font-size:15px;background:radial-gradient(ellipse at 88% 0,#ff8a1f0d,transparent 40%),var(--bg)}
button{transition:background .15s,border-color .15s;touch-action:manipulation}
button.primary{background:var(--app-accent);color:#241204;border-color:var(--app-accent)}button.primary:hover{background:#ffa24b;border-color:#ffa24b}
button[aria-pressed=true]{border-color:var(--app-accent);background:color-mix(in srgb,var(--app-accent) 12%,var(--panel))}
button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible,canvas:focus-visible,svg:focus-visible,.upload-btn:focus-within{outline:2px solid var(--app-accent);outline-offset:3px}
input[type=range]{accent-color:var(--app-accent);min-height:36px}
output{color:var(--accent-text);font:500 13px var(--mono)}
.eyebrow{font:10px var(--mono);color:var(--accent-text);letter-spacing:.11em;margin-bottom:9px}
:root[data-theme=light] output,:root[data-theme=light] .eyebrow{color:var(--accent-text)}
.skip-link:not(:focus){clip-path:inset(50%);opacity:0;pointer-events:none}

/* header + hero */
.app-header{max-width:none;padding:12px max(24px,calc((100vw - 1400px)/2));min-height:64px}
.app-header strong{font-size:12px;letter-spacing:.13em}.app-header strong span{margin-left:12px;color:var(--muted);font:10px var(--mono);letter-spacing:.1em}
.app-main{max-width:1440px;padding:18px 24px 28px}
.intro{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;padding:0 0 14px}
.intro .eyebrow{margin-bottom:4px}
.intro h1{font:650 clamp(28px,3vw,40px)/1.08 var(--display);letter-spacing:-.04em}.intro h1 span{color:var(--accent-text)}
.intro-note{color:var(--muted);font-size:14px;line-height:1.55;max-width:470px}

/* bench */
.bench{border:1px solid var(--line);border-radius:17px;background:var(--panel);scroll-margin-top:8px;box-shadow:0 18px 60px #00000022}
.bench:focus{outline:none}
.bench-grid{display:grid;grid-template-columns:240px minmax(0,1fr) 300px;align-items:stretch}
.rail-label{font:10px var(--mono);letter-spacing:.11em;color:var(--accent-text);margin-bottom:8px}
.questions{padding:14px 14px;border-right:1px solid var(--line);min-width:0}
.question-grid{display:grid;gap:7px}
.question-grid button{text-align:left;min-width:0;padding:9px 11px 10px;background:var(--bg);border-radius:10px;position:relative;display:grid;grid-template-columns:20px minmax(0,1fr);column-gap:6px;align-items:start;min-height:0}
.question-grid button[aria-pressed=true]{background:color-mix(in srgb,var(--app-accent) 13%,var(--panel))}
.question-grid span{font:10px/1.9 var(--mono);color:var(--accent-text);grid-row:span 2}
.question-grid strong{font-size:13.5px;line-height:1.3;font-weight:600}
.question-grid small{font-size:11px;line-height:1.4;color:var(--muted);font-weight:400;margin-top:2px}
.tabs{padding:4px;border:1px solid var(--line);border-radius:11px;background:var(--bg);display:flex;gap:4px}
.tabs button{border:0;background:transparent;min-height:36px;font-size:12px;padding:6px 14px;white-space:nowrap}
.tabs button[aria-pressed=true]{background:var(--app-accent);color:#241204}
.tabs button[aria-pressed=false]{color:var(--muted)}.tabs button[aria-pressed=false]:hover{color:var(--fg)}
button.dot{font-size:12px;min-height:38px}
button.dot[aria-pressed=true]:before{content:'';display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--app-accent);margin-right:8px;vertical-align:1px}
button.dot[aria-pressed=false]:before{content:'';display:inline-block;width:7px;height:7px;border-radius:50%;border:1px solid var(--muted);margin-right:8px;vertical-align:0;box-sizing:border-box}

.stage{min-width:0;display:flex;flex-direction:column;background:var(--panel)}
.stage-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 14px 0}
.canvas-wrap{position:relative;height:clamp(360px,calc(100vh - 345px),600px);margin:10px 14px 0;border-radius:12px;background:var(--stage);border:1px solid var(--stage-line)}
#image{width:100%;height:100%;display:block;touch-action:none;border-radius:12px}
.quality-bar{margin:10px 14px 14px;padding:10px 14px 6px;border:1px solid color-mix(in srgb,var(--app-accent) 45%,var(--line));border-radius:12px;background:var(--bg)}
.q-head{display:flex;align-items:baseline;gap:12px}
.q-head label{font:600 16px var(--font);color:var(--fg)}
.q-head output{font:500 22px var(--mono)}
.q-size{margin-left:auto;font-size:14px;color:var(--muted)}.q-size b{font:500 16px var(--mono);color:var(--fg)}
.quality-bar input{margin:2px 0 0}
.scale{display:flex;justify-content:space-between;gap:10px;font:10px var(--mono);color:var(--soft);margin-top:-6px}

.rail{min-width:0;border-left:1px solid var(--line);padding:14px;display:flex;flex-direction:column;gap:12px}
.readouts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.readout{padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);min-width:0}
.readout span{display:block;font:9px var(--mono);letter-spacing:.1em;color:var(--muted)}
.readout strong{display:block;font:500 20px/1.3 var(--mono);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.readout.big strong{font-size:24px;color:var(--accent-text)}
.readout em{display:block;font-style:normal;font-size:11px;color:var(--muted);line-height:1.35;margin-top:2px}
#looksBox{grid-column:1/-1;border-left:4px solid var(--l-same)}
#looksBox strong{font-family:var(--font);font-weight:600;font-size:19px}
#looksBox[data-look=close]{border-left-color:var(--l-close)}#looksBox[data-look=visible]{border-left-color:var(--l-visible)}#looksBox[data-look=bad]{border-left-color:var(--l-bad)}
.readouts .readout:nth-child(3){grid-column:1/-1}
.tile-line{font-size:12.5px;color:var(--muted);line-height:1.45;display:flex;gap:8px;align-items:flex-start}.tile-line b{color:var(--fg)}
.tile-line .sw{flex:0 0 10px;height:10px;border:2px solid var(--app-accent);border-radius:2px;transform:translateY(1px)}
.wide{width:100%}
.rail-group{border-top:1px solid var(--line);padding-top:12px;display:grid;gap:6px}
.rail-group>label{font-size:13px;font-weight:600;color:var(--fg)}
.rail-group.muted input{opacity:.6}
.upload-row{margin-top:4px}
.upload-btn{display:flex;justify-content:center;align-items:center;min-height:44px;padding:9px 15px;border:1px dashed var(--app-accent);border-radius:9px;color:var(--fg);font-weight:600;font-size:13px;cursor:pointer;background:color-mix(in srgb,var(--app-accent) 7%,var(--raised))}
.upload-btn:hover{background:color-mix(in srgb,var(--app-accent) 15%,var(--raised))}
.control-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.control-head label{color:var(--fg);font-size:13px;font-weight:600}
.hint{font-size:11.5px;color:var(--muted);margin-top:2px;line-height:1.5}
.status{padding:10px 18px;margin:0;min-height:40px;color:var(--accent-text);font-size:12.5px;border-top:1px solid var(--line);background:var(--bg);border-radius:0 0 17px 17px}
.status.error{color:var(--bad)}

/* how it works */
.how{margin-top:18px;background:var(--panel);border:1px solid var(--line);border-radius:17px;padding:18px 20px}
.how-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:12px}
.how-head h2{font:620 28px/1.1 var(--display);letter-spacing:-.03em}
.stepper{display:flex;gap:6px;flex-wrap:wrap}
.stepper button{min-height:40px;font-size:13px;padding:6px 14px;border-radius:30px}
.stepper button b{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--bg);font:500 11px var(--mono);margin-right:6px}
.stepper button[aria-pressed=true] b{background:var(--app-accent);color:#241204}
.how-body{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:22px;align-items:center}
.steps-canvas{display:block;width:100%;height:340px;background:var(--stage);border:1px solid var(--stage-line);border-radius:12px}
.step-num{font:10px var(--mono);letter-spacing:.11em;color:var(--accent-text)}
.step-text h3{font:620 24px/1.15 var(--display);letter-spacing:-.02em;margin:6px 0 10px}
.step-text p{font-size:15px;line-height:1.6;color:var(--fg)}
.step-text .term{font-size:12px;color:var(--muted);margin-top:6px}
.step-text .fact{margin-top:12px;padding:10px 12px;border-left:3px solid var(--app-accent);background:var(--bg);border-radius:0 8px 8px 0;font-size:13.5px;color:var(--muted)}.step-text .fact b{color:var(--fg)}
.step-nav{display:flex;gap:8px;margin-top:14px}.step-nav button{font-size:13px}
.numbers{margin-top:16px;border-top:1px solid var(--line)}
.numbers summary{cursor:pointer;min-height:50px;display:flex;align-items:center;gap:10px;font-weight:600;font-size:14px;list-style:none}
.numbers summary::-webkit-details-marker{display:none}
.numbers summary:before{content:'+';font:18px var(--mono);color:var(--accent-text);width:16px}.numbers[open] summary:before{content:'−'}
.numbers summary small{font-weight:400;color:var(--muted);font-size:12px}
.numbers-body .tabs{display:inline-flex;margin-bottom:12px}
.num-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;align-items:start}
.pipeline{display:block;width:100%;height:auto;max-height:470px}
.pipeline .cd-t1,.strip .cd-t1{font:500 10.5px var(--mono);fill:var(--fg);letter-spacing:.05em}
.pipeline .cd-t2,.strip .cd-t2{font:10px var(--font);fill:var(--muted)}
.cd-end{text-anchor:end}
.cd-frame{fill:none;stroke:var(--line)}
.cd-cell{cursor:pointer}
.cd-num{font-family:var(--mono);text-anchor:middle;dominant-baseline:middle;pointer-events:none}
.cd-sel{fill:none;stroke:var(--fg);stroke-width:2;pointer-events:none}
.cd-zig{fill:none;stroke:var(--fg);stroke-width:1;opacity:.28;pointer-events:none;stroke-linejoin:round}
.cd-arrow{stroke:var(--accent-text);stroke-width:1.6}.cd-arrowhead{fill:var(--accent-text)}
.cd-step{font:500 11px var(--mono);fill:var(--accent-text);text-anchor:middle}.cd-step.cd-end{text-anchor:end}
.cd-step2{font:10px var(--font);fill:var(--muted);text-anchor:middle}
.strip-head{display:flex;justify-content:space-between;gap:10px;font:9px var(--mono);letter-spacing:.08em;color:var(--muted);margin:0 0 2px}
.strip-head span:last-child{color:var(--accent-text);letter-spacing:0}
.strip{display:block;width:100%;height:auto}
.strip .cd-base{stroke:var(--line)}
.strip .cd-ghost{fill:none;stroke:var(--muted);stroke-width:.8;opacity:.75}
.strip .cd-hit{cursor:pointer}
.strip .cd-sel{stroke-width:1.5}
.strip .cd-eob{stroke:var(--bad);stroke-width:1.5;stroke-dasharray:3 3}
.strip .cd-eobzone{fill:var(--bad);opacity:.08;pointer-events:none}
.strip .cd-clip{fill:var(--muted)}
.strip-legend{display:flex;gap:12px;flex-wrap:wrap;font-size:10.5px;color:var(--muted);margin-top:2px}
.strip-legend i{display:inline-block;width:9px;height:9px;margin-right:5px;vertical-align:-1px;border-radius:2px}
.strip-legend i.ghost{border:1px solid var(--muted)}.strip-legend i.warm{background:var(--app-accent)}.strip-legend i.cool{background:var(--cool)}.strip-legend i.eob{background:color-mix(in srgb,var(--bad) 30%,transparent);border:1px dashed var(--bad)}
.coef-card{display:flex;gap:14px;align-items:flex-start;margin-top:14px;padding:12px 14px;border:1px solid var(--line);border-radius:11px;background:var(--bg)}
.card-pattern{width:56px;height:56px;flex:0 0 56px;border-radius:4px;shape-rendering:crispEdges;outline:1px solid var(--line)}
.card-title{font:500 11px var(--mono);color:var(--accent-text);letter-spacing:.04em;margin-bottom:4px}
.card-text{font-size:12.5px;line-height:1.55;color:var(--muted)}.card-text b{color:var(--fg);font-family:var(--mono);font-weight:500;font-size:12px}.card-text .lost{color:var(--bad);font-weight:600}
.stage3d{position:relative;height:420px;border-radius:12px;background:radial-gradient(ellipse at 50% 30%,color-mix(in srgb,var(--raised) 70%,transparent),var(--stage));border:1px solid var(--stage-line);overflow:hidden}
.c3-canvas{display:block;touch-action:none;cursor:grab}.c3-canvas:active{cursor:grabbing}
.c3-labels{position:absolute;inset:0;pointer-events:none}
.c3-tag{position:absolute;left:0;top:0;font:10px var(--mono);color:var(--muted);white-space:nowrap;background:color-mix(in srgb,var(--bg) 70%,transparent);padding:2px 6px;border-radius:5px}
.c3-tag-dc{color:var(--accent-text)}
.c3-status{position:absolute;left:12px;top:10px;right:12px;font-size:12px;color:var(--muted);margin:0;pointer-events:none}
.three-foot{display:flex;gap:12px;align-items:flex-start;justify-content:space-between;margin-top:8px}.three-foot .hint{margin:0}.three-foot button{flex:none;font-size:12px}
.rate-legend{display:flex;gap:14px;flex-wrap:wrap;font-size:11px;color:var(--muted);margin-top:6px}.rate-legend i{display:inline-block;width:14px;height:4px;border-radius:2px;margin-right:6px;vertical-align:2px}
.l-same{background:var(--l-same)}.l-close{background:var(--l-close)}.l-visible{background:var(--l-visible)}.l-bad{background:var(--l-bad)}

/* learn */
.learn{display:grid;grid-template-columns:1.1fr 1fr;gap:16px;margin-top:18px;align-items:start}
.learn-2{grid-template-columns:1fr 1.1fr;align-items:start}
.learn-panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 22px;min-width:0}
.learn-panel h2{font:620 26px/1.1 var(--display);letter-spacing:-.03em;margin-bottom:12px}
.happening p{font-size:14px;line-height:1.7;color:var(--muted);padding:9px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:96px minmax(0,1fr);gap:12px}
.happening p:first-child{border-top:0}
.happening p .k{font:9px/2.3 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--accent-text)}
.happening b{color:var(--fg);font-weight:600}
.rate-chart{display:block;width:100%;height:280px}
.axis-note{font:10px var(--mono);color:var(--muted);text-align:right;margin-top:-2px}
.challenges{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.challenges li{border:1px solid var(--line);border-radius:11px;padding:12px 14px;background:var(--bg);transition:border-color .2s}
.challenges li.now{border-color:var(--app-accent)}.challenges li.done{border-color:color-mix(in srgb,var(--good) 55%,var(--line))}
.ch-head{display:flex;align-items:center;gap:10px}
.ch-mark{width:18px;height:18px;flex:0 0 18px;border-radius:50%;border:1.5px solid var(--soft);display:grid;place-items:center}
.done .ch-mark{background:var(--good);border-color:var(--good)}
.done .ch-mark:after{content:'';width:8px;height:4px;border:2px solid var(--bg);border-top:0;border-right:0;transform:rotate(-45deg) translate(1px,-1px)}
.challenges strong{font-size:14px}
.challenges p{font-size:12.5px;color:var(--muted);margin:5px 0 0 28px;line-height:1.55}.challenges p b{color:var(--fg)}
.challenges .ch-progress{font:11px var(--mono);color:var(--soft)}.now .ch-progress{color:var(--accent-text)}.done .ch-progress{color:var(--good)}
.ch-actions{display:flex;align-items:flex-start;gap:12px;margin:8px 0 0 28px;flex-wrap:wrap}.ch-actions button{min-height:38px;font-size:12px;padding:6px 14px}
.ch-actions details{flex:1 1 160px}.ch-actions summary{font-size:12px;cursor:pointer;color:var(--accent-text);min-height:38px;display:inline-flex;align-items:center}
.ch-actions details p{margin-left:0;margin-top:0}
#challengeStatus{margin-top:12px;color:var(--accent-text)}
.notes{display:grid;gap:8px}
.notes details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:0 20px}
.notes summary{cursor:pointer;min-height:52px;display:flex;align-items:center;font-weight:600;font-size:14px;list-style:none}
.notes summary::-webkit-details-marker{display:none}
.notes summary:after{content:'+';margin-left:auto;font:18px var(--mono);color:var(--accent-text)}
.notes details[open] summary:after{content:'−'}
.notes-body{padding:0 0 18px}
.notes-body p,.notes-body li{font-size:13.5px;color:var(--muted);line-height:1.75;margin-bottom:10px}
.notes-body ul{padding-left:18px;margin:0}
.notes-body code{font:12px var(--mono);color:var(--accent-text)}
.notes-body b{color:var(--fg)}.notes-body a{color:var(--fg)}
.noscript{padding:20px;color:var(--muted)}
.app-footer{margin-top:26px}

@media(max-width:1280px){.bench-grid{grid-template-columns:220px minmax(0,1fr) 280px}.question-grid small{display:none}}
@media(max-width:1100px){
  .bench-grid{grid-template-columns:minmax(0,1fr) 290px}
  .questions{grid-column:1/-1;border-right:0;border-bottom:1px solid var(--line)}
  .question-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .canvas-wrap{height:auto;aspect-ratio:1}
  .how-body{grid-template-columns:minmax(0,1fr)}
  .num-grid{grid-template-columns:minmax(0,1fr)}.pipeline{max-width:560px}
  .learn,.learn-2{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:760px){
  .app-header{padding-inline:16px;min-height:58px}
  .app-header strong span{display:none}
  .app-main{padding:14px 12px 24px}
  .intro{flex-direction:column;align-items:flex-start;gap:6px;padding-bottom:12px}
  .intro h1{font-size:28px}.intro-note{font-size:13px}
  .bench-grid{grid-template-columns:minmax(0,1fr)}
  .questions{padding:12px}
  .question-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:6px}
  .question-grid button{padding:8px 9px;grid-template-columns:minmax(0,1fr)}.question-grid span{display:none}.question-grid strong{font-size:12.5px}
  .stage{position:sticky;top:0;z-index:5;border-bottom:1px solid var(--line);box-shadow:0 10px 24px #00000040}
  .stage-bar{padding:8px 8px 0}.stage-bar .tabs button{padding:6px 10px}
  .canvas-wrap{margin:8px 8px 0;aspect-ratio:auto;height:min(calc(100vw - 18px),42vh)}
  .quality-bar{margin:8px;padding:6px 10px 2px}
  .q-head output{font-size:18px}.q-size{font-size:12.5px}.q-size b{font-size:14px}
  .scale{display:none}
  .rail{border-left:0}
  .how{padding:14px 12px}
  .how-head h2{font-size:23px}
  .stepper{width:100%;display:grid;grid-template-columns:repeat(4,1fr)}.stepper button{padding:6px 4px;font-size:12px}.stepper button b{display:block;margin:0 auto 2px}
  .steps-canvas{height:215px}
  .step-text h3{font-size:20px}.step-text p{font-size:14px}
  .learn-panel{padding:17px 15px}
  .happening p{grid-template-columns:minmax(0,1fr);gap:2px;font-size:13.5px}
  .challenges p,.ch-actions{margin-left:0}
  .notes details{padding:0 15px}
  .stage3d{height:340px}
  .three-foot{flex-direction:column}
  .rate-chart{height:240px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}