@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}

:root{--app-accent:#ff8a1f;--accent-text:#ff9d43;--bg:#0b1015;--panel:#111920;--raised:#1d2832;--line:#2b3741;--fg:#ecf0f2;--muted:#a3afb9;
  --font:Instrument,system-ui,sans-serif;--display:Anybody,system-ui,sans-serif;--mono:JetBrains,ui-monospace,monospace;
  --k-think:#7fb2ff;--k-act:#ff8a1f;--k-observe:#4fd6c4;--k-check:#b99dff;--k-fail:#f2c14e;--k-warn:#f2c14e;--k-good:#5ad69a;--k-bad:#ff6b7d;--k-neutral:#a3afb9;
  --node-bg:#16212b;--diagram-bg:#0d141a;--edge:#3a4955;--danger:#ff6b7d}
:root[data-theme=light]{--bg:#f4f2ee;--panel:#fff;--raised:#eeeae4;--line:#d8d3cb;--fg:#1b2933;--muted:#5c6870;--accent-text:#a64c00;
  --k-think:#2c62c9;--k-act:#c75a00;--k-observe:#0b8577;--k-check:#6a43d1;--k-fail:#9a6a00;--k-warn:#9a6a00;--k-good:#1c7a4c;--k-bad:#c42339;--k-neutral:#5c6870;
  --node-bg:#ffffff;--diagram-bg:#f7f5f1;--edge:#c6bfb5;--danger:#c42339}

body{font-family:var(--font);font-size:15px}
button{transition:background .15s,border-color .15s;touch-action:manipulation}
button.primary,button.primary[aria-pressed=true]{background:var(--app-accent);color:#241204;border-color:var(--app-accent)}
button.primary:hover{background:#ffa24b}
button[aria-pressed=true]{border-color:var(--app-accent);background:color-mix(in srgb,var(--app-accent) 11%,var(--panel))}
button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible,.trace:focus-visible,.bench:focus-visible{outline:2px solid var(--app-accent);outline-offset:3px}
input[type=range]{accent-color:var(--app-accent)}
output{color:var(--accent-text)}
:root[data-theme=light] output,:root[data-theme=light] .eyebrow{color:var(--accent-text)}
code{font:12px var(--mono);color:var(--fg);background:var(--raised);padding:1px 6px;border-radius:5px}

.app-header{max-width:none;padding:12px max(24px,calc((100vw - 1400px)/2));min-height:70px}
.app-header strong{font-size:12px;letter-spacing:.13em}
.app-header strong span{margin-left:12px;color:var(--muted);font:10px var(--mono)}
.app-main{max-width:1440px;padding:20px 24px 28px}
.eyebrow{font:10px var(--mono);color:var(--accent-text);letter-spacing:.11em;margin-bottom:8px}

/* Hero */
.intro{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:0 0 18px}
.intro h1{font:650 clamp(32px,3.1vw,46px)/1.04 var(--display);letter-spacing:-.045em}
.intro h1 span{color:var(--accent-text)}
.intro-note{display:flex;align-items:center;gap:24px;max-width:490px}
.intro-note p{color:var(--muted);font-size:14px;line-height:1.7}
.intro-glyph{width:72px;height:72px;flex:none;color:var(--accent-text);transform:rotate(-6deg)}

/* Question cards */
.presets{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin-bottom:14px}
.presets button{text-align:left;min-width:0;padding:10px 13px 11px;background:var(--panel);border-radius:12px;position:relative;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start}
.presets button[aria-pressed=true]:after{content:'';position:absolute;inset:auto 15px -1px;height:3px;background:var(--app-accent);border-radius:3px}
.presets span{display:block;font:9px var(--mono);color:var(--accent-text);letter-spacing:.06em;margin-bottom:5px}
.presets strong{font-size:14px;line-height:1.28;display:block}
.presets small{display:block;margin-top:3px;font-size:11px;line-height:1.4;color:var(--muted);font-weight:400}

/* Bench */
.bench{border:1px solid var(--line);border-radius:17px;overflow:hidden;background:var(--panel);scroll-margin-top:12px}
.bench-toolbar{padding:12px 18px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.tabs{padding:4px;border:1px solid var(--line);border-radius:11px;background:var(--bg);flex-wrap:nowrap;display:flex;gap:4px}
.tabs button{background:transparent;border-color:transparent;white-space:nowrap;font-size:12px}
.tabs button[aria-pressed=true]{background:var(--app-accent);color:#251406}
.task-line{margin-right:auto;font-size:13px;color:var(--muted);min-width:0}
.task-line b{color:var(--fg);font-weight:600}
.bench-actions{display:flex;gap:8px}
.bench-actions button{font-size:12px}

.meter-strip{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-bottom:1px solid var(--line)}
.meter-strip>div{padding:10px 20px;border-right:1px solid var(--line);min-width:0}
.meter-strip>div:last-child{border-right:0}
.meter-strip span{display:block;font:9px var(--mono);letter-spacing:.1em;color:var(--muted)}
.meter-strip strong{display:block;font:500 22px var(--mono);letter-spacing:-.04em;margin:2px 0 0;font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meter-strip strong small{font-size:13px;color:var(--muted);letter-spacing:0}
.meter-strip strong.accent{color:var(--accent-text)}
.meter-strip strong.warn{color:var(--k-fail)}
.meter-strip strong.bad{color:var(--k-bad)}
.meter-strip strong.good{color:var(--k-good)}
.meter-strip>div>small{display:block;color:var(--muted);font-size:11px}

.work-area{display:grid;grid-template-columns:250px minmax(0,1fr) 330px;grid-template-areas:"controls stage side" "insight insight insight"}
.controls{grid-area:controls;border-right:1px solid var(--line);padding:16px 20px;display:grid;gap:18px;align-content:start;background:color-mix(in srgb,var(--bg) 35%,var(--panel))}
.stage{grid-area:stage;min-width:0;display:flex;flex-direction:column}
.side{grid-area:side;border-left:1px solid var(--line);display:flex;flex-direction:column;min-width:0}

.stage-head,.block-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;padding:16px 22px 10px}
.stage-head{align-items:center;padding-top:12px;padding-bottom:8px}
.stage-head h2,.block-head h2,.ctrl-group h2{font:600 19px/1.2 var(--font);letter-spacing:-.03em}
.legend{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 14px;font-size:11px;color:var(--muted);justify-content:flex-end;max-width:330px}
.legend li{display:flex;align-items:center;gap:6px;white-space:nowrap}
i.sw{display:inline-block;width:10px;height:10px;border-radius:3px;flex:none}
.sw.k-think{background:var(--k-think)}.sw.k-act{background:var(--k-act)}.sw.k-observe{background:var(--k-observe)}.sw.k-check{background:var(--k-check)}.sw.k-fail{background:var(--k-fail)}.sw.k-bad{background:var(--k-bad)}

/* Diagrams */
.diagram-wrap{margin:0 22px;border-radius:12px;background:var(--diagram-bg);border:1px solid var(--line);overflow:hidden}
.diagram{display:block;width:100%;height:auto}
.diagram.tall .node-label{font-size:16px}.diagram.tall .node-verb{font-size:9px}.diagram.tall .node-note{font-size:12px}
.diagram text{font-family:var(--font)}
.zone-label{font:13px var(--mono);letter-spacing:.12em;fill:var(--muted);opacity:.75}
.zone-rule{stroke:var(--line);stroke-dasharray:2 6}
.edge{fill:none;stroke:var(--edge);stroke-width:2;transition:stroke .25s}
.edge.off{stroke-dasharray:4 6;opacity:.45}
.edge.hot{stroke:var(--app-accent);stroke-width:2.6}
.edge.latest{stroke-width:4}
.edge.to-blocked{stroke:var(--k-bad);stroke-width:2.6;stroke-dasharray:7 5}
.arrow-head{fill:var(--edge)}.arrow-head.hot{fill:var(--app-accent)}.arrow-head.bad{fill:var(--k-bad)}
.node{cursor:pointer;outline:none}
.node .box{fill:var(--node-bg);stroke:var(--line);stroke-width:1.5;transition:fill .25s,stroke .25s}
.node .halo{fill:none;stroke:none}
.node .kind-bar{fill:var(--kc)}
.node .node-verb{font:11px var(--mono);letter-spacing:.1em;fill:var(--kc)}
.node .node-label{font-size:19px;letter-spacing:-.01em;font-weight:600;fill:var(--fg)}
.node .count circle{fill:var(--kc)}
.node .count text{font:600 11px var(--mono);fill:#10161b}
.node .now-tag{font:600 12px var(--mono);letter-spacing:.14em;fill:var(--kc);opacity:0}
.node.k-think{--kc:var(--k-think)}.node.k-act{--kc:var(--k-act)}.node.k-observe{--kc:var(--k-observe)}.node.k-check{--kc:var(--k-check)}
.node.k-fail{--kc:var(--k-fail)}.node.k-warn{--kc:var(--k-warn)}.node.k-good{--kc:var(--k-good)}.node.k-bad{--kc:var(--k-bad)}
.node.visited .box{fill:color-mix(in srgb,var(--kc) 13%,var(--node-bg));stroke:color-mix(in srgb,var(--kc) 55%,var(--line))}
.node.current .box{stroke:var(--kc);stroke-width:3;fill:color-mix(in srgb,var(--kc) 24%,var(--node-bg))}
.node.current .halo{stroke:var(--kc);stroke-width:2;opacity:.45;animation:halo 1.6s ease-in-out infinite}
.node.current .now-tag{opacity:1}
.node.disabled{opacity:.42}
.node.disabled .box{stroke-dasharray:5 5}
.node:hover .box,.node:focus-visible .box,.node.selected .box{stroke:var(--fg)}
.node:focus-visible .halo{stroke:var(--app-accent);stroke-width:2.5;opacity:1;animation:none}
@keyframes halo{50%{opacity:.08}}
.node-note{font:14px var(--mono);fill:var(--muted)}
.node-note.warn{fill:var(--k-bad)}
.token{fill:var(--app-accent);stroke:var(--diagram-bg);stroke-width:3;opacity:0;pointer-events:none}
.token.bad{fill:var(--k-bad)}

.tl-row{stroke:var(--line);stroke-width:1}
.tl-grid{stroke:var(--line);stroke-width:1;opacity:.35}.tl-grid.major{opacity:.8}
.tl-label{font-size:16px;font-weight:600;fill:var(--muted)}
.tl-label.k-think{fill:var(--k-think)}.tl-label.k-act{fill:var(--k-act)}.tl-label.k-observe{fill:var(--k-observe)}.tl-label.k-check{fill:var(--k-check)}.tl-label.k-fail{fill:var(--k-fail)}
.tl-tick{font:13px var(--mono);fill:var(--muted)}
.tl-axis{font:11px var(--mono);fill:var(--muted)}
.tl-over{fill:var(--k-bad);opacity:.07}
.tl-wall{stroke:var(--k-bad);stroke-width:2.5}
.tl-wall-label{font:600 13px var(--mono);letter-spacing:.08em;fill:var(--k-bad)}
.tl-need{stroke:var(--fg);stroke-width:1.5;stroke-dasharray:3 4;opacity:.6}
.tl-need-label{font:13px var(--mono);fill:var(--fg);opacity:.75}
.tl-path{fill:none;stroke:var(--app-accent);stroke-width:2.5;stroke-linejoin:round}
.tl-dot{stroke:var(--diagram-bg);stroke-width:2.5}
.tl-dot.k-think{fill:var(--k-think)}.tl-dot.k-act{fill:var(--k-act)}.tl-dot.k-observe{fill:var(--k-observe)}.tl-dot.k-check{fill:var(--k-check)}
.tl-dot.k-fail{fill:var(--k-fail)}.tl-dot.k-warn{fill:var(--k-warn)}.tl-dot.k-good{fill:var(--k-good)}.tl-dot.k-bad{fill:var(--k-bad)}
.tl-dot.last{stroke:var(--fg)}
.tl-end{font-size:17px;font-weight:600}
.tl-end.k-good{fill:var(--k-good)}.tl-end.k-warn{fill:var(--k-warn)}.tl-end.k-bad{fill:var(--k-bad)}

.caption-row{display:flex;gap:16px;align-items:flex-start;justify-content:space-between;padding:4px 22px 16px}
.node-caption{font-size:13px;color:var(--muted);line-height:1.55;min-height:40px;flex:1;min-width:0}
.node-caption b{color:var(--fg)}

/* Budget meter */
.budget{padding:4px 22px 12px}
.budget-head{display:flex;justify-content:space-between;align-items:center;font:10px var(--mono);letter-spacing:.1em;color:var(--muted);margin-bottom:2px}
.budget-ctl{flex:1;min-width:150px;max-width:260px}
.budget-ctl .param-head label{color:var(--fg);font-size:12px}.budget-ctl output{font:600 13px var(--mono)}
#budget{display:block;margin:0;min-height:30px;height:30px}
.budget-head span:last-child{letter-spacing:0;color:var(--fg)}
.budget-cells{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);gap:3px;position:relative}
.budget-cells i{height:16px;border-radius:3px;background:var(--raised);border:1px solid var(--line);position:relative}
.budget-cells i.used{border-color:transparent}
.budget-cells i.k-think{background:var(--k-think)}.budget-cells i.k-act{background:var(--k-act)}.budget-cells i.k-observe{background:var(--k-observe)}.budget-cells i.k-check{background:var(--k-check)}
.budget-cells i.k-fail{background:var(--k-fail)}.budget-cells i.k-warn{background:var(--k-warn)}.budget-cells i.k-good{background:var(--k-good)}.budget-cells i.k-bad{background:var(--k-bad)}
.budget-cells i.need:after{content:'';position:absolute;right:-3px;top:-5px;bottom:-5px;width:2px;background:var(--fg)}
.budget-note{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.5}
.budget-note b{color:var(--fg)}
.budget-note .bad{color:var(--k-bad)}

/* Human checkpoint */
.checkpoint{margin:0 22px 12px;padding:16px 18px;border:1.5px solid var(--k-check);border-radius:12px;background:color-mix(in srgb,var(--k-check) 10%,var(--panel));display:flex;gap:18px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.checkpoint .eyebrow{color:var(--k-check)}
.checkpoint h3{font:600 16px/1.3 var(--font);margin-bottom:4px}
.checkpoint .draft{font:13px var(--mono);color:var(--fg)}
.cp-evidence{font-size:12px;color:var(--muted);margin-top:3px}
.cp-evidence.bad{color:var(--k-bad)}
.cp-actions{display:flex;gap:8px}
.cp-actions button{min-width:96px}

.transport{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;padding:12px 22px}
.transport-buttons{display:flex;gap:7px;flex-wrap:wrap}
.transport-buttons button{font-size:12px}
#play{min-width:118px;display:inline-flex;align-items:center;justify-content:center;gap:9px}
#step{min-width:80px}
.play-icon{width:0;height:0;border-left:10px solid currentColor;border-top:6px solid transparent;border-bottom:6px solid transparent}
#play[aria-pressed=true] .play-icon{width:10px;height:12px;border:0;border-left:3px solid currentColor;border-right:3px solid currentColor}
.speed{display:flex;align-items:center;gap:8px;min-height:44px;font-size:12px;color:var(--fg)}
.speed select{width:auto;min-width:150px}

/* Side: answer + trace */
.panel-block{border-bottom:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.panel-block:last-child{border-bottom:0;flex:1}
.answer .block-head{align-items:center}
.verdict{font:10px var(--mono);letter-spacing:.06em;padding:5px 10px;border-radius:30px;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.verdict.good{color:var(--k-good);border-color:color-mix(in srgb,var(--k-good) 60%,transparent)}
.verdict.warn{color:var(--k-warn);border-color:color-mix(in srgb,var(--k-warn) 60%,transparent)}
.verdict.bad{color:var(--k-bad);border-color:color-mix(in srgb,var(--k-bad) 60%,transparent)}
.answer-text{font:13px/1.6 var(--mono);color:var(--fg);padding:0 22px 8px}
.answer-text.empty{font-family:var(--font);color:var(--muted)}
.evidence{list-style:none;margin:0;padding:0 22px 16px;font-size:12px;color:var(--muted)}
.evidence li{display:flex;gap:8px;align-items:baseline}
.evidence li:before{content:'◆';font-size:9px;color:var(--k-observe)}
.evidence li.none:before{content:'◇';color:var(--k-bad)}
.trace-block{min-height:0}
.trace{list-style:none;margin:0;padding:0 14px 16px 22px;overflow-y:auto;flex:1;min-height:220px;max-height:420px;scrollbar-width:thin}
.trace li{display:grid;grid-template-columns:30px minmax(0,1fr);gap:10px;padding:9px 0;border-top:1px solid color-mix(in srgb,var(--line) 70%,transparent);animation:fadein .3s ease-out}
.trace li:first-child{border-top:0}
.trace .t-step{font:11px var(--mono);color:var(--muted);padding-top:2px;font-variant-numeric:tabular-nums}
.trace .t-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.trace .chip{font:600 9px var(--mono);letter-spacing:.1em;padding:2px 7px;border-radius:5px;color:#10161b;background:var(--kc)}
.trace .t-state{font-size:13px;font-weight:600}
.trace .t-msg{font-size:12px;color:var(--muted);line-height:1.5;margin-top:2px}
.trace .t-detail{font:11px/1.5 var(--mono);color:var(--fg);margin-top:5px;padding:5px 8px;background:var(--bg);border-radius:6px;border-left:2px solid var(--kc);overflow-wrap:anywhere}
.trace .t-detail span{color:var(--muted)}
.trace .t-detail.bad{border-left-color:var(--k-bad);color:var(--k-bad)}
.trace li.k-think{--kc:var(--k-think)}.trace li.k-act{--kc:var(--k-act)}.trace li.k-observe{--kc:var(--k-observe)}.trace li.k-check{--kc:var(--k-check)}
.trace li.k-fail{--kc:var(--k-fail)}.trace li.k-warn{--kc:var(--k-warn)}.trace li.k-good{--kc:var(--k-good)}.trace li.k-bad{--kc:var(--k-bad)}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}}

.ctrl-group h2{margin-bottom:6px}
.field-row{margin-top:4px}
.field-row label{margin-bottom:6px;color:var(--fg);font-size:12px}
.param{margin-top:10px}
.param-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.param-head label{color:var(--fg);font-size:12px}
.param-head output{font:13px var(--mono)}
.param input[type=range]{margin:0;display:block;height:36px;min-height:36px}
.toggle{display:flex;gap:10px;align-items:flex-start;padding:5px 0;cursor:pointer;min-height:44px}
.toggle input{accent-color:var(--app-accent);width:18px;height:18px;margin:2px 0 0;flex:none}
.toggle b{display:block;color:var(--fg);font-size:13px;font-weight:600;line-height:1.3}
.toggle small{display:block;font-size:11px;line-height:1.45;color:var(--muted)}
.ctrl-note{font-size:11px;line-height:1.6;color:var(--muted);margin-top:10px}

.insight{grid-area:insight;display:flex;gap:16px;align-items:flex-start;padding:18px 24px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--bg) 30%,var(--panel))}
.insight-dot{width:10px;height:10px;border-radius:50%;background:var(--muted);margin-top:4px;flex:none;box-shadow:0 0 0 5px color-mix(in srgb,var(--muted) 18%,transparent)}
.insight[data-tone=good] .insight-dot{background:var(--k-good);box-shadow:0 0 0 5px color-mix(in srgb,var(--k-good) 20%,transparent)}
.insight[data-tone=learn] .insight-dot{background:var(--app-accent);box-shadow:0 0 0 5px #ff8a1f2e}
.insight[data-tone=warn] .insight-dot{background:var(--k-bad);box-shadow:0 0 0 5px color-mix(in srgb,var(--k-bad) 22%,transparent)}
.insight .eyebrow{margin-bottom:4px}
.insight h3{font:600 17px/1.3 var(--font);letter-spacing:-.02em;margin-bottom:3px}
.insight p:not(.eyebrow){font-size:13px;color:var(--muted);max-width:920px}

/* Challenges and learning cards */
.challenges{margin-top:28px}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:14px}
.section-head h2,.card h2{font:600 22px/1.2 var(--font);letter-spacing:-.035em}
.score{font:12px var(--mono);color:var(--muted)}
.challenge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.challenge{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:10px;min-width:0}
.challenge.done{border-color:color-mix(in srgb,var(--k-good) 60%,var(--line))}
.challenge-top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.challenge-top span{font:9px var(--mono);color:var(--accent-text);letter-spacing:.08em}
.badge-state{font:10px var(--mono);padding:4px 9px;border-radius:30px;border:1px solid var(--line);color:var(--muted)!important;white-space:nowrap}
.challenge.done .badge-state{color:var(--k-good)!important;border-color:color-mix(in srgb,var(--k-good) 50%,transparent)}
.challenge h3{font:600 17px/1.3 var(--font);letter-spacing:-.02em}
.challenge p{font-size:13px;line-height:1.65;color:var(--muted)}
.challenge .check{font:11px var(--mono);color:var(--fg);opacity:.85}
.challenge button{margin-top:auto;align-self:flex-start;font-size:12px}

.learning-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:23px;min-width:0}
.card h2{margin-bottom:12px}
.card p:not(.eyebrow),.card li{font-size:13px;line-height:1.7;color:var(--muted)}
.formula{font:14px/2 var(--mono)!important;color:var(--accent-text)!important;margin-bottom:12px;overflow-wrap:anywhere}
details{margin-top:16px;border-top:1px solid var(--line)}
summary{padding-block:14px;cursor:pointer;min-height:44px;font-size:13px;font-weight:600;color:var(--fg)}
details p{margin-bottom:10px}
.steps{padding-left:20px;margin:0 0 12px}
.steps li{margin-bottom:6px}
.steps strong{color:var(--fg)}
.plain{padding-left:18px;margin:0 0 12px}
.plain li{margin-bottom:5px}
.sources a,.related a{color:var(--fg)}
.related{margin-top:14px;font-size:12px!important}
.noscript{padding:20px;color:var(--muted)}
.app-footer{font-size:11px;margin-top:28px}

/* Responsive */
@media(max-width:1280px){.work-area{grid-template-columns:240px minmax(0,1fr) 310px}.presets{grid-template-columns:repeat(3,minmax(0,1fr))}.meter-strip>div{padding:12px 16px}}
@media(max-width:1100px){
  .work-area{grid-template-columns:minmax(0,1fr) 320px;grid-template-areas:"stage side" "controls controls" "insight insight"}
  .controls{border-right:0;border-top:1px solid var(--line);grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
  .intro-note{max-width:360px}
}
@media(max-width:860px){
  .work-area{grid-template-columns:minmax(0,1fr);grid-template-areas:"stage" "controls" "insight" "side"}
  .controls{border-top:1px solid var(--line)}
  .side{border-left:0;border-top:1px solid var(--line);max-height:none}
  .controls{grid-template-columns:1fr 1fr}
  .challenge-grid,.learning-grid{grid-template-columns:minmax(0,1fr)}
  .meter-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .meter-strip>div{border-bottom:1px solid var(--line)}
  .meter-strip>div:nth-child(2n){border-right:0}
  .meter-strip>div:last-child{grid-column:1/-1;border-bottom:0}
  .intro{flex-direction:column;align-items:flex-start;gap:16px;padding-bottom:24px}
  .intro-glyph{width:64px;height:64px}
  .trace{max-height:420px}
}
@media(max-width:760px){.app-main{padding:26px 16px}.app-header{padding-inline:16px}}
@media(max-width:600px){
  .app-main{padding:22px 12px}
  .app-header strong{font-size:10px;letter-spacing:.06em}.app-header strong span{display:none}.app-header>a{font-size:11px}
  .intro h1{font-size:clamp(30px,8.6vw,40px)}
  .intro-note{gap:14px}.intro-glyph{display:none}.intro-note p{font-size:13px}
  .presets{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .presets button{padding:12px}
  .presets strong{font-size:14px}
  .bench-toolbar{padding:10px 12px;gap:8px}
  .tabs{width:100%}.tabs button{flex:1;padding-inline:8px}
  .caption-row{flex-direction:column;padding:4px 14px 14px;gap:8px}
  .meter-strip>div{padding:11px 13px}
  .meter-strip strong{font-size:20px}
  .meter-strip>div>small{font-size:10px}
  .stage-head,.block-head{padding:14px 14px 10px;flex-direction:column;gap:8px}
  .answer .block-head{flex-direction:row;align-items:flex-start}
  .legend{justify-content:flex-start}
  .diagram-wrap{margin:0 8px;overflow-x:auto}
  .diagram{min-width:0}
  .node-caption{font-size:12px}
  .budget{padding:4px 14px 12px}
  .checkpoint{margin:0 12px 12px;padding:14px}
  .cp-actions{width:100%}.cp-actions button{flex:1}
  .transport{padding:12px}
  .transport-buttons{width:100%}
  #play{flex:1}
  .budget-ctl{max-width:none;width:100%;order:3}
  .speed{flex:1}
  .speed select{width:100%;min-width:0}
  .answer-text,.evidence{padding-inline:14px}
  .trace{padding:0 12px 14px 14px}
  .controls{grid-template-columns:minmax(0,1fr);padding:16px 14px}
  .insight{padding:16px 14px;gap:12px}
  .challenge,.card{padding:18px}
  .section-head{flex-direction:column;align-items:flex-start;gap:4px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

.diagram.tall .tl-label{font-size:12px}.diagram.tall .tl-tick,.diagram.tall .tl-need-label,.diagram.tall .tl-wall-label{font-size:11px}.diagram.tall .tl-end{font-size:14px}

/* Phone status bar: keeps the run visible while you adjust controls below the diagram. */
.mini-bar{display:none}
@media(max-width:860px){
  .mini-bar{position:fixed;left:8px;right:8px;top:8px;z-index:30;display:flex;align-items:center;gap:10px;padding:6px 6px 6px 12px;border:1px solid var(--line);border-radius:12px;background:color-mix(in srgb,var(--panel) 92%,transparent);backdrop-filter:blur(8px);box-shadow:0 8px 24px #0006;font:12px var(--mono);color:var(--muted);transform:translateY(-140%);transition:transform .2s}
  .mini-bar.show{transform:none}
  .mini-state{font-weight:600;color:var(--fg)}
  .mini-state.good{color:var(--k-good)}.mini-state.bad{color:var(--k-bad)}.mini-state.warn{color:var(--k-fail)}
  #miniNeed{margin-right:auto}
  .mini-bar button{min-height:36px;padding:4px 14px;font-size:12px}
}
@media(min-width:1101px){.toggle small{display:none}.toggle{min-height:40px;align-items:center}.toggle input{margin-top:0}.ctrl-group .eyebrow{margin-bottom:4px}}
.diagram.tall .node .now-tag{display:none}