*{box-sizing:border-box}body{margin:0;background:#fff;color:#232421;font:14px Arial,Helvetica,sans-serif}button,input,a{ -webkit-tap-highlight-color:transparent}button,a{color:inherit}button,.button{font:inherit;background:white;border:1px solid #232421;padding:12px 18px;cursor:pointer;text-decoration:none}button:hover,.button:hover{border-color:#c73136;color:#c73136}button:disabled{opacity:.35;cursor:default}a{text-decoration:none}header{display:flex;align-items:center;justify-content:space-between;padding:28px 32px;gap:20px}.brand{font-size:20px}.brand span{font-size:12px;color:#888980}nav{display:flex;gap:26px}nav a{font-size:12px;color:#888980;padding:8px 0}nav a.active{color:#232421;border-bottom:1px solid #c73136}.quiet{border:0;padding:6px 0;font-size:12px;color:#777873}main{max-width:1440px;margin:35px auto;padding:0 48px}.status{display:flex;gap:30px;align-items:center;padding-bottom:24px;font-variant-numeric:tabular-nums;font-size:13px;letter-spacing:1px}.status #total{margin-left:auto;font-size:22px}.status small{font-size:10px;color:#888}.workspace{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(280px,1fr);gap:48px}.plot-heading,.plot-foot,.under-input{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px;color:#777873}.plot-heading{height:34px;border-bottom:1px solid #deded8}.legend{display:flex;align-items:center;gap:7px}.legend i{width:16px;height:0;border-top:2px solid #232421}.legend .guess-key{border-top:2px dotted #232421;margin-left:8px}#graph{width:100%;height:440px;display:block;touch-action:none}.plot-foot{min-height:32px;font-size:10px}.red{color:#c73136}#guess-form{display:flex;border-bottom:1px solid #232421;align-items:center;margin-top:28px;gap:12px}#prefix{font:24px Georgia,serif;white-space:nowrap}#equation{width:100%;min-width:0;padding:16px 0;border:0;background:transparent;font:23px Georgia,serif;color:#232421;outline:none}#equation::placeholder{color:#b6b6ae;font:18px Georgia,serif}#submit{white-space:nowrap;padding:12px;font-size:12px}input:focus-visible,button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid #c73136;outline-offset:4px}.under-input{margin-top:12px}#error{color:#c73136;font-size:12px;min-height:15px}details{font-size:11px;line-height:1.7;color:#888980;max-width:620px}summary{cursor:pointer;width:max-content}aside{min-width:0}#guesses{max-height:760px;overflow:auto}.empty{display:grid;place-content:center;text-align:center;height:300px;color:#aaa99f;font-size:12px;gap:18px}.empty span{font:44px Georgia,serif}.guess-card{border-bottom:1px solid #deded8;padding:10px 0;cursor:pointer}.guess-card.selected{border-left:2px solid #c73136;padding-left:12px}.guess-top{display:flex;justify-content:space-between;gap:10px;align-items:center}.formula{font:17px Georgia,serif;overflow-wrap:anywhere}.fit{font-size:12px;white-space:nowrap}.guess-meta{font-size:10px;color:#888980;margin-top:5px}.difference{width:100%;height:88px;display:block}#round-result{font:22px Georgia,serif;min-height:0;margin-top:14px}#round-result:empty{display:none}#complete{max-width:650px;margin:80px auto;text-align:center}.eyebrow{font-size:10px;letter-spacing:2px;color:#888980}h1{font-size:80px;font-weight:400;letter-spacing:-4px;margin:20px}#breakdown{display:flex;justify-content:center;gap:30px;margin:30px 0;color:#777873}#save-form{display:flex;justify-content:center;gap:10px;margin:30px}#initials{width:85px;text-transform:uppercase;text-align:center;letter-spacing:3px;font:18px Arial;border:1px solid #ccc}#save-status{font-size:12px;color:#777}dialog{width:min(440px,90vw);border:1px solid #232421;padding:26px}dialog::backdrop{background:#ffffffbd;backdrop-filter:blur(4px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between}h2{font-size:22px;font-weight:400}.dialog-heading button{border:0;font-size:24px}#score-list{padding-left:24px}#score-list li{padding:10px;border-bottom:1px solid #eee;font-variant-numeric:tabular-nums}.muted,#scores-mode{color:#888;font-size:11px}[hidden]{display:none!important}@media(min-width:1600px){#graph{height:520px}}@media(max-width:800px){header{padding:20px;flex-wrap:wrap}.brand span{display:none}nav{gap:18px}main{margin:20px auto;padding:0 20px}.workspace{grid-template-columns:1fr;gap:28px}#graph{height:340px}#guesses{max-height:none}.empty{height:120px}#equation{font-size:20px}.status{padding-bottom:14px}#complete{margin:40px auto}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

#error-graph{display:block;width:100%;height:125px}#selected-error{margin-top:8px}#selected-error .plot-heading{height:22px;border-bottom:0}#graph{height:380px}.legend .guess-key{border-color:#232421}@media(max-width:800px){#graph{height:310px}}

/* Square plots retain their geometry at every viewport size. */
#graph,#error-graph,.comparison,.difference{display:block;width:100%;height:auto;aspect-ratio:1 / 1}
.graph-pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;margin-top:8px}
.graph-pair canvas{min-width:0}.header-actions{display:flex;gap:10px}.header-actions .button,.header-actions button{font-size:12px;padding:10px 14px}
.quiet,details>summary{border:1px solid #bdbeb5;padding:9px 12px;color:#232421;background:white;font:12px Arial,sans-serif;cursor:pointer}.quiet:hover,details>summary:hover{border-color:#c73136;color:#c73136}
.hint-row{display:flex;align-items:center;gap:16px;margin-top:16px}.hint-row button{white-space:nowrap;font-size:12px}.hint-row small{color:#c73136;margin-left:6px}#hint{font-size:12px;color:#777873;line-height:1.5}
#complete{max-width:1120px;margin:40px auto}#breakdown{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;text-align:left;color:#232421}.round-summary{border-top:1px solid #232421;padding-top:16px;min-width:0}.summary-heading{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#777873}.summary-heading strong{font-size:24px;font-weight:400;color:#232421}.summary-heading small{font-size:10px}.summary-equation{font:20px Georgia,serif;overflow-wrap:anywhere;min-height:48px}.summary-best{font:14px Georgia,serif;overflow-wrap:anywhere}.summary-stats,.summary-penalty{font-size:11px;line-height:1.6;color:#777873}.summary-penalty{color:#c73136}.round-summary .graph-pair{grid-template-columns:1fr}.round-summary details{margin-top:16px}.round-summary ol{padding-left:20px;overflow-wrap:anywhere}.round-summary li{margin:10px 0}#complete h1{margin-bottom:12px}
@media(max-width:800px){#breakdown{grid-template-columns:1fr}.round-summary .graph-pair{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.summary-equation{min-height:0}.hint-row{flex-wrap:wrap}.under-input{align-items:center}.header-actions{gap:8px}}
#selected-error{width:min(100%,300px)}

/* The arena is fixed; history owns its scrolling. */
body{height:100dvh;overflow:hidden;display:flex;flex-direction:column}header{padding:16px 24px;flex-shrink:0}main{width:100%;max-width:1440px;flex:1;min-height:0;margin:0 auto;padding:0 24px 16px;display:flex;flex-direction:column}.status{flex-shrink:0;height:36px;padding:0 0 10px}.status #total{font-size:18px}.workspace{flex:1;min-height:0;grid-template-columns:minmax(0,1.35fr) minmax(280px,1fr);gap:24px;border:1px solid #232421;padding:16px;overflow:hidden}.target{min-width:0;min-height:0;display:flex;flex-direction:column}.target>.plot-heading{height:26px;flex-shrink:0}.plot-stage{flex:1;min-height:0;min-width:0;display:flex;align-items:center;justify-content:center;gap:12px;overflow:hidden}.plot-stage canvas{flex-shrink:0}.plot-stage #selected-error{margin:0;flex-shrink:0}.plot-foot{height:26px;min-height:26px;flex-shrink:0}.plot-foot .quiet{padding:4px 8px;font-size:10px}#round-result{margin:0;height:26px;min-height:26px;line-height:26px;font-size:17px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}#round-result:empty{display:block}#guess-form{margin-top:0;height:44px;flex-shrink:0}#equation{padding:9px 0;font-size:21px}#submit{padding:9px;font-size:11px}.under-input{margin-top:6px;min-height:32px;flex-shrink:0}.under-input .quiet{padding:7px 9px;font-size:11px}.hint-row{margin-top:6px;gap:10px;flex-shrink:0;justify-content:space-between;flex-wrap:nowrap}.hint-row button{padding:8px 10px;font-size:11px}#hint{margin:5px 0 0;height:28px;min-height:28px;line-height:14px;font-size:11px;overflow:auto;flex-shrink:0}#error{margin:0;min-height:18px;height:18px;font-size:11px;overflow:auto;flex-shrink:0}.workspace aside{min-height:0;display:flex;flex-direction:column;border-left:1px solid #deded8;padding-left:20px}.workspace aside>.plot-heading{flex-shrink:0;height:26px}#guesses{flex:1;min-height:0;max-height:none;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;scrollbar-gutter:stable;padding-right:6px}.guess-card{padding:12px 0}.guess-card.selected{padding-left:8px}.guess-top .formula{font-size:15px}.graph-pair{gap:8px}.empty{height:100%;min-height:0}#help{max-height:80dvh;overflow:auto}#help p{font-size:12px;line-height:1.7;color:#777873}
/* Results keep the same outer window; only the detailed recap scrolls. */
#complete{width:100%;max-width:1120px;margin:0 auto;flex:1;min-height:0;overflow:auto;padding:12px 16px;border:1px solid #232421}#complete h1{font-size:48px;margin:8px}#complete .eyebrow{margin:4px}#breakdown{margin:20px 0}.results-mode .status{display:none}#save-form{margin:16px}.results-mode #save-status{margin:8px}
@media(max-width:700px){header{padding:10px 12px;gap:8px;flex-wrap:nowrap}.brand{font-size:18px}.header-actions .button,.header-actions button{padding:8px 10px;font-size:11px}main{padding:0 10px 10px}.status{height:30px;font-size:11px;gap:18px}.workspace{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) minmax(100px,25%);padding:10px;gap:10px}.workspace aside{border-left:0;border-top:1px solid #deded8;padding:0;min-height:0}#guesses .graph-pair{max-width:360px;margin-inline:auto}.guess-card{padding:8px 0}.target>.plot-heading,.workspace aside>.plot-heading{font-size:10px;height:22px}.legend{gap:5px}.plot-foot{font-size:9px;height:22px;min-height:22px}#round-result{font-size:14px;height:21px;min-height:21px;line-height:21px}#guess-form{height:38px}#equation{font-size:18px}#prefix{font-size:20px}#submit{padding:8px}.under-input{margin-top:4px;min-height:28px;font-size:10px}.under-input .quiet{font-size:10px;padding:6px}.hint-row{margin-top:4px}.hint-row button{padding:6px 8px;font-size:10px}#hint{margin-top:3px;font-size:10px;line-height:12px;height:24px;min-height:24px}#error{font-size:10px;height:14px;min-height:14px}#complete{padding:12px}#complete h1{font-size:42px}}
@media(max-height:550px) and (min-width:701px){header{padding:8px 16px}main{padding:0 16px 8px}.workspace{padding:8px;gap:12px}.status{height:28px}.hint-row button{padding:6px}#hint{height:16px;min-height:16px}.plot-foot{height:20px;min-height:20px}#round-result{height:20px;min-height:20px;line-height:20px}.under-input{min-height:28px}#guess-form{height:36px}}
#guesses{container-type:size}#guesses .graph-pair{width:min(100%,max(80px,calc((100cqh - 60px)*2)));margin-inline:auto}

@media(max-height:550px) and (min-width:701px){
 .workspace{grid-template-columns:minmax(0,1.65fr) minmax(240px,1fr)}.target{display:grid;grid-template-columns:minmax(0,1fr) 190px;grid-template-rows:26px 22px 36px 32px 30px 26px 18px minmax(0,1fr) 20px;column-gap:10px}.target>.plot-heading{grid-column:1/-1;grid-row:1}.plot-stage{grid-column:1;grid-row:2/9;height:100%}.plot-foot{grid-column:1;grid-row:9}.target #round-result{grid-column:2;grid-row:2}.target #guess-form{grid-column:2;grid-row:3}.target .under-input{grid-column:2;grid-row:4}.target .hint-row{grid-column:2;grid-row:5;gap:4px}.target #hint{grid-column:2;grid-row:6}.target #error{grid-column:2;grid-row:7}.hint-row button{font-size:9px;padding:6px 4px}.hint-row small{margin-left:2px}.under-input{font-size:9px;gap:4px}.under-input .quiet{font-size:9px;padding:6px 4px}#equation{font-size:16px}#prefix{font-size:18px}#submit{font-size:10px;padding:6px}
}

/* Give the target the full height; controls live above the delta history. */
.workspace{grid-template-columns:minmax(0,1fr) minmax(300px,350px);gap:20px}.target{display:flex;flex-direction:column}.target .plot-stage{height:auto;flex:1;grid-area:auto}.target .plot-foot,.target>.plot-heading{grid-area:auto}.game-controls{flex-shrink:0;padding-bottom:12px;border-bottom:1px solid #deded8;margin-bottom:10px}.game-controls #round-result{font-size:16px}.game-controls #equation{font-size:20px}.game-controls .hint-row{gap:8px}.game-controls .hint-row button{font-size:10px;padding:8px}.game-controls #hint{height:28px;min-height:28px}#guesses .graph-pair{grid-template-columns:1fr;width:min(100%,max(80px,calc(100cqh - 66px)));margin-inline:auto}.workspace aside{padding-left:18px}#final-score:focus{outline:none}#complete #save-form{margin:12px 0 8px}#complete #again{display:inline-block;margin-bottom:8px}
@media(max-width:700px){.workspace{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) minmax(285px,45%);gap:8px}.workspace aside{padding:8px 0 0}.game-controls{padding-bottom:4px;margin-bottom:4px;display:grid;grid-template-columns:1fr auto;gap:2px 8px}.game-controls #round-result{grid-column:1/-1;height:18px;min-height:18px;font-size:13px;line-height:18px}.game-controls #guess-form{grid-column:1/-1;height:34px}.game-controls .under-input{grid-column:1/-1;margin-top:2px}.game-controls .hint-row{grid-column:1/-1;margin-top:2px}.game-controls #hint{grid-column:1/-1;height:24px;min-height:24px;margin:0}.game-controls #error{grid-column:1/-1;height:12px;min-height:12px}.game-controls .hint-row button{padding:5px 8px}.game-controls #equation{font-size:18px}.game-controls .under-input .quiet{padding:5px 8px}#guesses .guess-meta{font-size:9px}.guess-card{padding:6px 0}#guesses .graph-pair{width:min(100%,max(70px,calc(100cqh - 52px)))}#guesses .guess-top .formula{font-size:13px}}
@media(max-height:550px) and (min-width:701px){.workspace{grid-template-columns:minmax(0,1fr) 300px}.target{display:flex}.target .plot-stage{grid-area:auto}.game-controls{padding-bottom:4px;margin-bottom:4px}.game-controls #round-result{height:18px;min-height:18px;font-size:13px;line-height:18px}.game-controls #guess-form{height:32px}.game-controls .under-input{min-height:24px;margin-top:2px}.game-controls .hint-row{margin-top:2px}.game-controls .hint-row button{padding:5px;font-size:9px}.game-controls #hint{height:14px;min-height:14px;margin:2px 0 0}.game-controls #error{height:12px;min-height:12px}#guesses .graph-pair{width:min(100%,max(55px,calc(100cqh - 50px)))}.guess-card{padding:4px 0}.guess-meta{font-size:9px}}

/* Match the arcade controls and keep two square plots together per guess. */
button,.button,.quiet{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}
#submit,#finish,#save-form button,#again{background:#232421;border-color:#232421;color:white}
#submit:hover:not(:disabled),#finish:hover:not(:disabled),#save-form button:hover,#again:hover{background:#c73136;border-color:#c73136;color:white}
#help-open{font-size:10px;padding:6px 9px;letter-spacing:0;white-space:nowrap}
.workspace{grid-template-columns:minmax(0,1fr) minmax(360px,430px);gap:16px}.plot-stage{justify-content:flex-start}.workspace aside{padding-left:16px}
#guesses .graph-pair{grid-template-columns:minmax(0,1fr) minmax(0,1fr);width:100%;max-width:none}
.game-controls #hint{height:42px;min-height:42px;line-height:16px;overflow:auto}.hint-formula{display:block;color:#232421;font:17px Georgia,serif;line-height:22px}
.component-credit{font-size:10px;line-height:1.5;color:#777873;margin:7px 0 0;overflow-wrap:anywhere}
@media(max-width:700px){.workspace{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) minmax(305px,47%)}.workspace aside{padding:6px 0 0}.status{gap:12px;letter-spacing:0}.status #total{font-size:16px}#help-open{font-size:9px;padding:5px 6px}.game-controls #hint{height:36px;min-height:36px;line-height:14px}.hint-formula{font-size:15px;line-height:20px}}
@media(max-height:550px) and (min-width:701px){.workspace{grid-template-columns:minmax(0,1fr) 360px}.game-controls #hint{height:32px;min-height:32px;line-height:13px}.hint-formula{font-size:15px;line-height:18px}.game-controls .hint-row button{padding:4px 6px}}

#guesses .graph-pair{width:min(100%,max(120px,calc((100cqh - 100px)*2)))}
@media(max-height:550px) and (min-width:701px){#guesses .graph-pair{width:min(100%,max(96px,calc((100cqh - 80px)*2)))}.component-credit{font-size:9px;line-height:11px;margin-top:3px}}

.hint-formula{font-size:15px}@media(max-width:700px){.hint-formula{font-size:12px}}

#view-reset{white-space:nowrap}

.bonus-summary{grid-column:1/-1}.round-summary.bonus-summary .graph-pair{grid-template-columns:repeat(2,minmax(0,1fr));max-width:600px}.bonus-summary .summary-equation{min-height:0}