/* Mixed Strategy Arena · The Lab */
:root{
  --paper:#f7f7f2;--white:#fff;--ink:#171916;--soft:#4b4f47;--rule:#babeb3;--accent:#254dff;
  --row:#9a4f00;--row-fill:#f2a43a;--row-tint:#fbe6c4;
  --col:#00707f;--col-fill:#3cc4d6;--col-tint:#cdeff4;
  --good:#1d6b33;--bad:#b3261e;
  --sans:'Space Grotesk',system-ui,-apple-system,'Segoe UI',sans-serif;
  --display:'Anton',Impact,'Arial Narrow Bold','Arial Narrow',sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.5 var(--sans);overflow-x:hidden}
a{color:var(--ink);text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:3px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--paper);padding:8px 12px;z-index:20}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.top{border-bottom:2px solid var(--ink)}
.top .wrap{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-top:12px;padding-bottom:12px;font-weight:600}
.top a{text-decoration:none}.top a:hover{text-decoration:underline;text-decoration-color:var(--accent)}

/* Hero */
.hero{padding:34px 0 8px}
.kicker{margin:0 0 6px;font-size:13px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--soft)}
h1{font-family:var(--display);font-weight:400;text-transform:uppercase;font-size:clamp(46px,10vw,120px);line-height:.9;margin:0;letter-spacing:.005em}
h1 span{color:var(--accent)}
.lede{font-size:clamp(17px,2vw,20px);max-width:760px;margin:16px 0 0}
h2{font-family:var(--display);font-weight:400;text-transform:uppercase;letter-spacing:.02em;font-size:26px;line-height:1.05;margin:0 0 10px}
h3{font-size:14px;letter-spacing:.07em;text-transform:uppercase;margin:18px 0 8px;font-weight:700}

/* Bar: scenario + tabs */
.bar{display:flex;flex-wrap:wrap;gap:14px 24px;align-items:end;justify-content:space-between;border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);margin-top:26px;padding:14px 0}
.field{display:flex;flex-direction:column;gap:4px}
.field label,legend{font-size:13px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--soft)}
select,input[type=text]{font:inherit;color:var(--ink);background:var(--white);border:2px solid var(--ink);border-radius:0;padding:8px 10px;min-height:44px}
select{padding-right:28px}
.scenario-field select{min-width:min(320px,100%);font-weight:600;font-size:17px}
.scenario-field{flex:1 1 260px;max-width:420px}
.tabs{display:flex;border:2px solid var(--ink)}
.tabs [role=tab]{font:inherit;font-weight:700;font-size:16px;background:var(--paper);color:var(--ink);border:0;border-left:2px solid var(--ink);padding:10px 20px;min-height:44px;cursor:pointer;text-transform:uppercase;letter-spacing:.05em}
.tabs [role=tab]:first-child{border-left:0}
.tabs [role=tab][aria-selected=true]{background:var(--ink);color:var(--paper)}
.tabs [role=tab]:hover:not([aria-selected=true]){background:var(--white)}
.tab-no{font-family:var(--mono);font-size:12px;opacity:.8;margin-right:4px}
.matchup{margin:14px 0 0;font-size:17px}
.matchup .r{color:var(--row);font-weight:700}.matchup .c{color:var(--col);font-weight:700}
.note{margin:4px 0 18px;color:var(--soft);font-size:14px;max-width:880px}

/* Cards */
.panel{padding-bottom:20px}
.card{background:var(--white);border:1px solid var(--rule);border-top:3px solid var(--ink);padding:18px;min-width:0}
.card-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;flex-wrap:wrap}
.solve-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:18px}
.solve-grid.lower{margin-top:18px;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr)}
.hint{color:var(--soft);font-size:14px;margin:0 0 12px}
.summary{color:var(--soft);font-size:14px;margin:10px 0 0}

/* Buttons */
.btn{font:inherit;font-weight:600;min-height:44px;padding:9px 16px;border:2px solid var(--ink);background:var(--white);color:var(--ink);cursor:pointer;border-radius:0}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:#1638d6}
.btn.ghost:hover{background:var(--paper)}
.btn.small{min-height:36px;padding:5px 10px;font-size:14px}
.row-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
kbd{font-family:var(--mono);font-size:.8em;border:1px solid currentColor;border-radius:3px;padding:0 4px}

/* Chips */
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:700;padding:3px 9px;border:2px solid currentColor;border-radius:999px;background:var(--white)}
.chip.ok{color:var(--good)}.chip.bad{color:var(--bad)}.chip.info{color:var(--ink)}
.chip.ok::before{content:"✓"}.chip.bad::before{content:"!"}

/* Matrix */
.custom-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-bottom:14px;padding:12px;background:var(--paper);border:1px solid var(--rule)}
.check{display:flex;align-items:center;gap:8px;font-weight:600;font-size:14px;min-height:44px;grid-column:1/-1}
.check input{width:20px;height:20px;accent-color:var(--accent)}
.matrix-scroll{overflow-x:auto;max-width:100%;padding:4px 2px}
.matrix{border-collapse:separate;border-spacing:4px;margin:0}
.matrix th{font-weight:600;font-size:14px;text-align:left;vertical-align:bottom;padding:2px 4px}
.matrix thead th{color:var(--col)}
.matrix tbody th{color:var(--row);text-align:right;white-space:nowrap;vertical-align:middle}
.matrix .corner{font-size:12px;color:var(--soft);font-weight:500;line-height:1.25}
.matrix .corner b{display:block}
.matrix .corner .r{color:var(--row)}.matrix .corner .c{color:var(--col)}
.matrix td{padding:0}
.cell{width:84px;min-height:48px;height:48px;text-align:center;font-family:var(--mono);font-size:16px;border:1px solid var(--rule);padding:4px}
.cell.invalid{border:3px solid var(--bad);background:#fdeceb!important}
.label-input{width:96px;min-height:44px;font-size:14px;padding:4px 6px;font-weight:600}
.badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;border:1px solid var(--soft);color:var(--soft);padding:0 5px;margin-left:4px;vertical-align:middle;background:var(--paper)}
.legend-line{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;font-size:13px;color:var(--soft);margin:10px 0 0}
.swatch{width:14px;height:14px;display:inline-block;border:1px solid var(--rule)}
.sw-row{background:var(--row-fill)}.sw-col{background:var(--col-fill);margin-left:10px}
.error{color:var(--bad);font-weight:600;font-size:14px;margin:8px 0 0;min-height:0}
.error:empty{display:none}
.warn{font-size:14px;margin:8px 0 0;padding:8px 10px;border-left:4px solid var(--row-fill);background:var(--paper)}
.warn:empty{display:none}

/* Equilibrium */
.value-block{border-bottom:1px solid var(--rule);padding-bottom:8px;margin-bottom:12px}
.value-label{margin:0;font-size:14px;color:var(--soft)}
.value{font-family:var(--display);font-size:clamp(56px,8vw,92px);line-height:1;margin:4px 0 0;font-variant-numeric:tabular-nums}
.mixbar{margin:10px 0 14px}
.mixbar-title{display:flex;justify-content:space-between;gap:10px;font-size:14px;font-weight:700;margin-bottom:4px}
.mixbar-title.r{color:var(--row)}.mixbar-title.c{color:var(--col)}
.stack{display:flex;gap:2px;height:34px;background:var(--white)}
.seg-bar{display:flex;align-items:center;justify-content:center;overflow:hidden;font-family:var(--mono);font-size:13px;font-weight:700;color:var(--ink);white-space:nowrap;min-width:0;transition:flex-grow .25s ease}
.seg-bar.zero{display:none}
.r0{background:#f2a43a}.r1{background:#f8c97f}.r2{background:#e38a10}.r3{background:#fbe1b6}
.c0{background:#3cc4d6}.c1{background:#93dde8}.c2{background:#22a6b8}.c3{background:#c4eef4}
.mix-legend{display:flex;flex-wrap:wrap;gap:4px 14px;margin:6px 0 0;padding:0;list-style:none;font-size:13px}
.mix-legend li{display:flex;align-items:center;gap:5px}
.mix-legend .dot{width:11px;height:11px;display:inline-block}
.mix-legend .num{font-family:var(--mono);font-weight:700}
.indiff{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.indiff p.lead{margin:0 0 6px;font-size:14px}
.indiff ul{list-style:none;margin:0;padding:0;font-size:14px}
.indiff li{display:flex;justify-content:space-between;gap:8px;padding:4px 0;border-bottom:1px dotted var(--rule)}
.indiff li .num{font-family:var(--mono);font-weight:700}
.indiff li.off{color:var(--soft)}
.indiff li.off .tag{font-size:12px}
.mono{font-family:var(--mono)}

/* Geometry */
.geo svg{width:100%;height:auto;display:block}
.geo .note-box{padding:24px;background:var(--paper);border:1px dashed var(--rule);color:var(--soft)}
.table-wrap{overflow-x:auto;margin-top:10px}
table.data{border-collapse:collapse;font-size:14px;width:100%}
table.data th,table.data td{border-bottom:1px solid var(--rule);padding:5px 8px;text-align:right}
table.data th:first-child,table.data td:first-child{text-align:left}
table.data td{font-family:var(--mono)}

/* Try a mix */
.sliders{display:flex;flex-direction:column;gap:8px}
.slider-row{display:grid;grid-template-columns:minmax(80px,auto) 1fr 64px;align-items:center;gap:10px}
.slider-row label{font-weight:600;font-size:14px;color:var(--row)}
.slider-row output{font-family:var(--mono);text-align:right;font-weight:700}
input[type=range]{width:100%;min-height:44px;accent-color:var(--row);margin:0}
.stats-dl{display:grid;grid-template-columns:1fr auto;gap:6px 14px;margin:14px 0 0;font-size:15px}
.stats-dl dt{color:var(--soft)}
.stats-dl dd{margin:0;font-family:var(--mono);font-weight:700;text-align:right}
.stats-dl dd.gap-bad{color:var(--bad)}.stats-dl dd.gap-ok{color:var(--good)}

/* Play */
.setup-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
fieldset{border:0;margin:0;padding:0;min-width:0}
legend{padding:0;margin-bottom:6px}
.seg{display:flex;flex-wrap:wrap;border:2px solid var(--ink);width:max-content;max-width:100%}
.seg label{position:relative;display:flex;align-items:center;min-height:44px;padding:8px 14px;font-weight:600;cursor:pointer;border-left:2px solid var(--ink)}
.seg label:first-child{border-left:0}
.seg input{position:absolute;opacity:0;width:1px;height:1px}
.seg label:has(input:checked){background:var(--ink);color:var(--paper)}
.seg label:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:2px;z-index:1}
.diff-note{font-size:14px;color:var(--soft);margin:10px 0}
.advanced{margin:6px 0 12px}
.advanced summary{cursor:pointer;font-weight:600;min-height:44px;display:flex;align-items:center;width:max-content}
.seed-field{max-width:260px}
.seed-field .hint{margin:4px 0 0}
.best{font-size:14px;margin:8px 0 14px}
.best:empty{display:none}
.of{font-size:.6em;color:var(--soft)}
.prompt{font-size:18px;margin:0 0 12px}
.prompt .r{color:var(--row);font-weight:700}.prompt .c{color:var(--col);font-weight:700}
.actions{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.act{font:inherit;font-weight:700;font-size:20px;min-height:72px;border:2px solid var(--ink);background:var(--paper);color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px;padding:10px}
.act:hover{background:var(--white)}
.act .k{font-family:var(--mono);font-size:14px;border:1px solid currentColor;border-radius:3px;padding:0 6px}
.act.side-r{box-shadow:inset 0 -6px 0 var(--row-fill)}.act.side-c{box-shadow:inset 0 -6px 0 var(--col-fill)}
.act.dim{opacity:.55}
.act.chosen{background:var(--ink);color:var(--paper);opacity:1}
.reveal{min-height:64px;margin:14px 0 10px;display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;font-size:17px}
.reveal .pill{padding:6px 12px;border:2px solid var(--ink);font-weight:700}
.reveal .pill.r{border-color:var(--row);color:var(--row)}.reveal .pill.c{border-color:var(--col);color:var(--col)}
.reveal .result{font-family:var(--display);font-size:34px;text-transform:uppercase;letter-spacing:.02em;line-height:1}
.reveal .result.win{color:var(--good)}.reveal .result.lose{color:var(--bad)}
.reveal .ai-mode{font-size:13px;color:var(--soft);flex-basis:100%}
.reveal.pop{animation:pop .22s ease-out}
@keyframes pop{from{opacity:.2;transform:translateY(6px)}to{opacity:1;transform:none}}
.keys{font-size:13px;color:var(--soft);margin:12px 0 0}
.end-card{border-top-color:var(--accent)}
.verdict{font-family:var(--display);text-transform:uppercase;font-size:clamp(26px,3.6vw,40px);line-height:1.05;margin:0 0 12px}
.stats{margin-top:18px}
.stats>summary,.advanced summary{list-style:none}
.stats>summary::-webkit-details-marker,.advanced summary::-webkit-details-marker{display:none}
.stats>summary::before,.advanced summary::before{content:"+";font-family:var(--mono);font-weight:700;width:1.4em}
.stats[open]>summary::before,.advanced[open] summary::before{content:"−"}
.stats>summary{cursor:pointer;font-weight:700;text-transform:uppercase;letter-spacing:.06em;min-height:44px;display:flex;align-items:center;width:max-content}
.stats-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:18px;margin-top:8px}
canvas{width:100%;display:block}
#score-chart{aspect-ratio:600/260;height:auto}
.key{display:inline-block;width:18px;height:0;border-top:3px solid var(--ink);margin-left:8px}
.key:first-child{margin-left:0}
.k-ev{border-top-color:var(--accent)}.k-eq{border-top:2px dashed var(--soft)}
.k-fp{border-top-color:var(--row-fill);border-top-width:4px}.k-rm{border-top:3px dashed var(--col)}
.readout{font-size:15px;margin:0}
.readout b{font-family:var(--mono)}
.cmp{display:grid;grid-template-columns:minmax(70px,auto) 1fr;gap:3px 10px;align-items:center;font-size:13px;margin-bottom:8px}
.cmp .name{font-weight:600;grid-row:span 2}
.cmp .line{display:flex;align-items:center;gap:6px}
.cmp .track{flex:1;height:10px;background:var(--paper);border:1px solid var(--rule);position:relative}
.cmp .fill{position:absolute;inset:0 auto 0 0}
.cmp .fill.you{background:var(--ink)}.cmp .fill.eq{background:var(--rule)}
.cmp .lbl{font-family:var(--mono);min-width:94px;text-align:right}

/* Learn */
.learn-intro{max-width:860px}
.learn-controls{display:flex;flex-wrap:wrap;gap:10px;align-items:end;margin-bottom:16px}
.speed-field{min-width:200px;flex:0 1 260px}
.learn-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px}
#fp-canvas,#rm-canvas{aspect-ratio:2/1;height:auto}
#expl-canvas{aspect-ratio:900/220;height:auto}

/* Footer */
.foot{margin-top:40px;border-top:2px solid var(--ink)}
.disclaimer{font-size:14px;color:var(--soft);margin:14px 0 6px;max-width:820px}
.foot-line{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:14px;margin:0;padding-bottom:36px}

@media (max-width:900px){
  .solve-grid,.solve-grid.lower,.stats-grid,.learn-grid{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  body{padding-bottom:72px}
  .hero{padding-top:18px}
  .lede{font-size:16px;margin-top:10px}
  .note{font-size:13px}
  .bar{margin-top:18px}
  .scenario-field{max-width:none;flex-basis:100%}
  .scenario-field select{width:100%}
  .tabs{position:fixed;left:0;right:0;bottom:0;z-index:10;border:0;border-top:2px solid var(--ink);background:var(--paper)}
  .tabs [role=tab]{flex:1;padding:10px 4px;min-height:60px;font-size:15px}
  .tab-no{display:block;margin:0}
  .card{padding:14px}
  .indiff{grid-template-columns:1fr}
  .actions{grid-template-columns:1fr}
  .act{min-height:64px}
  .cell{width:72px}
  .slider-row{grid-template-columns:1fr 64px}
  .slider-row label{grid-column:1/-1}
  .slider-row input{grid-column:1}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}