:root{--bg:#f6f4ed;--paper:#fffefa;--ink:#243e36;--muted:#62766e;--green:#20594d;--line:#d8dfd5;--yellow:#f4cd77;--red:#9c3933}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);border-radius:10px;padding:11px 18px;color:var(--ink);background:var(--paper);font-weight:600}button:hover{border-color:var(--green);background:#edf2e9}button:disabled{cursor:wait;opacity:.6}button.primary{background:var(--green);color:white;border-color:var(--green)}button.primary:hover{background:#163e35}a{color:var(--green)}:focus-visible{outline:3px solid #c59027;outline-offset:3px}input,textarea,select{width:100%;border:1px solid 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/* Playful lab: paper, ink, stickers and doodles. */
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button{border:2px solid var(--ink);border-radius:12px;box-shadow:2px 3px 0 var(--ink);transition:transform .15s,box-shadow .15s}
button:hover{transform:translate(-1px,-2px);box-shadow:3px 5px 0 var(--ink);background:#ffe392}
button:active{transform:translate(2px,2px);box-shadow:none}
button.primary{background:var(--yellow);color:var(--ink);border-color:var(--ink)}button.primary:hover{background:#ffdc6d}
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.avatar{border:2px solid var(--ink);box-shadow:2px 2px 0 var(--ink)}
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.eyebrow{letter-spacing:1.3px}.topline>.eyebrow{background:#ffcdad;border:2px solid var(--ink);color:var(--ink);padding:5px 10px;border-radius:6px;transform:rotate(-2deg)}
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.stat{border:2px solid var(--ink);box-shadow:3px 4px 0 #c0cfaa;border-radius:14px;background:#fffef7}.stat:nth-child(2){background:#dfedff;transform:rotate(1deg)}.stat:nth-child(3){background:#ffe1d4;transform:rotate(-1deg)}.stat strong{font-weight:850}
.panel{border:2px solid var(--ink);border-radius:17px;box-shadow:3px 4px 0 #c0cfaa}.panel h2{letter-spacing:-.8px}.source-note{border:1px dashed var(--ink);background:#dceccd}.row{border-bottom:1px dashed #aab99a}.row button{font-size:14px}
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@media(min-width:950px){.hero .sketch{transform:rotate(5deg)}}
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@media(prefers-reduced-motion:reduce){button{transition:none}}
.lab-block{padding:26px;border:2px solid var(--ink);background:#fff1b2;border-radius:20px;box-shadow:4px 5px 0 var(--ink);margin:30px 0}.lab-block h2{margin:18px 0}.forecast-label{display:block}.forecast-label textarea{min-height:80px;margin:10px 0}.lab-block>#reveal-lab{display:block;margin-top:20px}.model-controls{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0}.model-controls label{font-weight:600}.model-controls output{font-weight:800}input[type=range]{accent-color:var(--green);padding:10px 0;border:0;background:transparent}.lab-block canvas{width:100%;height:auto;border:2px solid var(--ink);border-radius:14px;display:block}.model-note{padding:18px;background:#e1eeff;border-radius:12px;font-size:16px!important}.lab-block small{display:block;margin:10px 0;line-height:1.6}.teaching-image{margin:34px 0}.teaching-image img{width:100%;border:2px solid var(--ink);border-radius:16px}.teaching-image figcaption{font-size:13px;color:var(--muted);margin-top:10px}.daily-grid{display:grid;gap:15px;margin:25px 0}.daily{padding:22px;background:#e5efda;border:2px solid var(--ink);border-radius:15px}.daily:nth-child(2){background:#e1eeff}.daily:nth-child(3){background:#ffe5d2}.daily h3{margin:14px 0}.daily p,.experiment p,.takeaway p{font-size:16px}.experiment{padding:24px;border:2px dashed var(--ink);border-radius:15px;margin:30px 0;background:#fffef7}.experiment h3{margin:15px 0}.experiment li{margin-bottom:15px}.takeaway{background:var(--green);color:white;padding:22px;border-radius:15px;margin:25px 0}.takeaway p{margin-bottom:0}.explain-section{margin:30px 0}.task-kind{margin-bottom:15px}.hint p{margin-bottom:12px;font-size:16px}#transfer-picture svg{width:100%;margin:20px 0;border:2px solid var(--ink);border-radius:14px;background:#fffef7}#transfer-picture svg text{font-family:system-ui,sans-serif;font-size:17px;fill:#183f3b}[data-transfer][aria-pressed=true]{background:var(--green);color:white}.energy-result{background:#fffef7;padding:24px;border:2px solid var(--ink);border-radius:15px}.energy-result strong{display:block;font-size:40px}.energy-result p{font-size:16px}.energy-result svg{width:100%}.flow-warm,.flow-cool{stroke-dasharray:15 5;animation:flow 2s linear infinite}.radiation-wave{stroke-dasharray:15 5;animation:flow 2s linear infinite}@keyframes flow{to{stroke-dashoffset:-40}}@media(max-width:650px){.lab-block{padding:18px;box-shadow:3px 4px 0 var(--ink)}.model-controls{grid-template-columns:1fr}.lab-block .actions button{font-size:14px;padding:9px}.teaching-image{overflow-x:auto}.teaching-image img{min-width:520px}.energy-result{padding:15px}.energy-result strong{font-size:32px}.experiment{padding:18px}}@media(prefers-reduced-motion:reduce){.flow-warm,.flow-cool,.radiation-wave{animation:none}}
.why-steps{background:#e6efda;padding:18px;border-radius:12px}.why-steps h4{margin:0 0 14px}.why-steps li{margin:12px 0;line-height:1.75}.why-steps ol{padding-left:22px}

.extra-picture svg{width:100%;border:2px solid var(--ink);border-radius:15px;margin:20px 0}.extra-picture svg text{font-family:system-ui,sans-serif;font-size:17px;fill:var(--ink)}.selected-cell{background:#ffcf45!important;color:var(--ink);font-weight:800}.model-controls label:has(input:disabled){opacity:.55}.energy-result strong{overflow-wrap:anywhere}.energy-result p{margin:12px 0}.energy-result .table-wrap{margin-top:24px}
.plan-today{background:#e1eeff;margin:26px 0}.plan-summary{padding:18px 0}.plan-summary strong{display:block;font-size:18px}.plan-weeks{margin:28px 0}.plan-weeks>details{margin:15px 0;border:2px solid var(--ink);border-radius:15px;background:var(--paper);overflow:hidden}.plan-weeks summary{padding:18px;background:#dceccd;cursor:pointer;font-weight:750}.plan-day{display:grid;grid-template-columns:125px 1fr auto;gap:18px;padding:22px;border-top:1px dashed #8b9f8a;align-items:start}.plan-day h3{margin:6px 0}.plan-day p{margin:8px 0;font-size:14px}.plan-day.done{background:#eef4e5}.plan-day.overdue{background:#fff0e1}.plan-date{font-size:14px;font-weight:700}.plan-date .badge{margin-top:9px}.plan-reflection{padding:12px;background:#fff1ba;border-radius:8px;overflow-wrap:anywhere}#plan-journal textarea{min-height:100px}#plan-journal label,#plan-dates label{display:block;margin:18px 0}.task-location{font-size:13px;font-weight:700;margin-top:28px}.task-location+.exercise{margin-top:10px}#daily-status{margin-top:24px}@media(max-width:650px){.plan-day{grid-template-columns:1fr;padding:18px;gap:10px}.plan-date{display:flex;justify-content:space-between;align-items:center}.plan-date .badge{margin-top:0}.plan-day button{justify-self:start}.plan-weeks summary{font-size:14px}.plan-summary strong{font-size:16px}}
/* A shared school entrance and a separate living-world course. */
.subject-hub{max-width:1160px;margin:0 auto;padding:32px 28px 70px}.hub-header{display:flex;align-items:center;gap:24px;margin-bottom:70px;flex-wrap:wrap}.hub-header>.brand{margin-right:auto}.hub-sticker{font-size:12px;background:#ffcc64;color:#173c2e;border:2px solid;padding:5px 9px;transform:rotate(-7deg);display:inline-block}.subject-hub h1{font-size:clamp(42px,6vw,76px);line-height:1.05;margin:20px 0}.subject-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:36px}.subject-card{text-align:left;border:3px solid #183c2e;border-radius:22px;padding:28px;box-shadow:7px 7px 0 #183c2e;position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:12px;min-height:350px;transition:transform .15s}.subject-card:hover{transform:translateY(-4px)}.physics-card{background:#f8d779}.biology-card{background:#c6e7b9}.subject-card h2{font-size:38px;margin:0}.subject-card p{font-size:18px;line-height:1.5}.subject-art{align-self:flex-end;font-size:68px;line-height:1;transform:rotate(8deg)}.subject-go{margin-top:auto;font-weight:bold;border-top:2px solid #183c2e;padding-top:15px;width:100%}.hub-footnote{margin-top:40px;color:#516253}.bio-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.bio-course{text-align:left;width:100%;background:#fffdf5}.bio-course h3{line-height:1.4}.bio-course>span:last-child{display:block;font-weight:bold;color:#266443}.bio-next{background:#d9edca}.biology .sidebar{background:#e2efcf}.bio-lab{background:#f3f8e9}.bio-tabs,.bio-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.bio-tabs button[aria-pressed=true]{background:#ffda77}.bio-model-detail{padding:18px;border:2px dashed #38664a;border-radius:14px;line-height:1.6;min-height:90px}.bio-compare{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.bio-specimen{padding:20px 8px;background:#fffdf5;display:flex;flex-direction:column;align-items:center;gap:12px}.bio-specimen>span{font-size:54px}.bio-diagram{display:block;width:100%;max-height:280px}.bio-diagram text{font-size:16px;fill:#163b2d}.bio-diagram [role=button]{cursor:pointer}.bio-highlight{outline:3px solid #bf692e;filter:drop-shadow(0 0 5px #e7a854)}.bio-option{display:flex;align-items:center;gap:10px;padding:12px 8px;border-bottom:1px solid #d4ddce;cursor:pointer}.bio-option input{width:20px;height:20px;flex-shrink:0}.bio-source-note{background:#fff0bd;padding:12px;border-radius:10px}.bio-parent-topics{font-size:14px}.biology details{padding:12px 0;border-bottom:1px solid #d4ddce}.biology summary{cursor:pointer;line-height:1.5}.biology .stats .card span{display:block}.biology .stats{display:flex;gap:16px;flex-wrap:wrap}.biology .stats strong{font-size:32px}.biology .card p{line-height:1.7}
@media(max-width:700px){.subject-grid,.bio-grid{grid-template-columns:1fr}.subject-hub{padding:22px 18px 45px}.hub-header{margin-bottom:40px;gap:12px}.hub-header>.brand{width:100%}.subject-card{min-height:300px;padding:24px}.bio-compare{gap:7px}.bio-specimen{font-size:12px;padding:14px 5px}.bio-specimen>span{font-size:38px}.bio-tabs button{max-width:100%}.bio-diagram text{font-size:14px}}
@media(prefers-reduced-motion:reduce){.subject-card{transition:none}}
.biology .card{background:var(--paper);border:2px solid var(--ink);border-radius:16px;padding:24px;margin:20px 0;box-shadow:3px 4px 0 #b8c6b4}.biology .bio-lab{background:#f3f8e9}.biology .bio-next{background:#d9edca}.biology .bio-course{margin:0}.subject-card.physics-card:hover{background:#ffe392}.subject-card.biology-card:hover{background:#d5efc8}.biology .card h2{margin-bottom:14px}.biology .bio-question{max-width:850px}.biology .stats .card{flex:1;min-width:160px}.biology .main{min-width:0}.bio-question [data-hints] p{font-size:14px}.bio-specimen.bio-highlight{background:#ffda77;outline:none;box-shadow:3px 3px 0 #183c2e}
.school-plan-day{padding:20px;border-top:1px dashed #8b9f8a}.school-plan-day p{margin:10px 0}.school-plan-day strong{display:block}.biology #bio-journal label{display:block;margin:18px 0}
.bio-figure{margin:22px 0}.bio-figure img,.bio-sim-image{display:block;width:100%;height:auto}.bio-figure figcaption{font-size:13px;margin-top:12px;color:var(--muted)}#bio-controls{display:flex;flex-wrap:wrap;gap:18px;margin:22px 0}#bio-controls>label{flex:1;min-width:200px;max-width:100%;font-weight:700}#bio-controls output{display:block;font-size:14px}#bio-controls input[type=range]{padding:0;accent-color:var(--green);height:30px}#bio-sim-picture svg{display:block;width:100%;height:auto;max-height:320px;margin:20px auto}#bio-sim-picture text{font-family:system-ui,sans-serif;font-size:17px;fill:var(--ink)}.bio-match-row{display:grid;grid-template-columns:minmax(90px,1fr) minmax(160px,2fr);align-items:center;gap:15px;margin:18px 0}.bio-option input[type=checkbox]{width:20px;height:20px}.bio-question h3{margin-top:12px}@media(max-width:600px){.bio-match-row{grid-template-columns:1fr;gap:8px}#bio-controls>label{min-width:100%}#bio-sim-picture text{font-size:15px}.bio-simulation{padding:18px!important}}
.bio-mollusk-focus{position:relative}.bio-mollusk-focus::after{content:'';position:absolute;top:7%;height:88%;width:31%;border:3px dashed #bf692e;border-radius:18px;pointer-events:none}.bio-focus-snail::after{left:1%}.bio-focus-mussel::after{left:34%}.bio-focus-octopus::after{left:67%}
.review-topic{padding:16px 0;border-bottom:1px dashed #a4b29d}.review-topic h3{margin-bottom:10px}.review-topic p{margin:8px 0}.review-topic:last-child{border-bottom:0}
.joint-day .eyebrow{margin-top:24px}.joint-day .joint-subject{margin-top:28px}.joint-day .joint-note{padding-top:18px;border-top:1px dashed #9daa97}.joint-note label{display:block;margin:12px 0}.joint-day>.source-note{margin:20px 0}.joint-review{background:#f8edc9}.joint-day .bio-question{background:var(--paper);border:2px solid var(--ink);border-radius:14px;padding:24px;margin:20px 0}.joint-day .bio-question h3{line-height:1.5}.joint-day .joint-subject>button{margin:8px 8px 8px 0}
.joint-shortcuts{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.joint-day section{scroll-margin-top:16px}

.chemistry-card{background:#ffe4ad;transform:rotate(-1deg)}.chemistry .sidebar{background:#ffe4ad}.chemistry .card{border-color:#dfb875}.chem-model{background:#fff3dd}.chem-result{font-size:1.25rem;font-weight:700}.chem-particles{display:flex;gap:1rem;flex-wrap:wrap;padding:1rem}.chem-atom{display:inline-grid;place-items:center;width:3rem;height:3rem;border-radius:50%;background:#bfded3;border:2px solid #252525}.chem-model label{display:block;margin:1rem 0}.chem-model input[type=range]{width:100%;max-width:450px}.chem-figure img{width:100%;height:auto}.chem-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1rem}.subject-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.chem-question{margin-bottom:1rem}

.chem-visual{padding:1rem 0;display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}.chem-visual p{flex-basis:100%;margin:.5rem 0}.chem-bar{display:flex;width:100%;min-height:64px;overflow:hidden;border:2px solid #292522;border-radius:12px}.chem-bar span{display:flex;align-items:center;justify-content:center;text-align:center;font-size:.85rem;overflow:hidden}.chem-flow{display:flex;flex-wrap:wrap;gap:.7rem;font-size:1.2rem;font-weight:700}.chem-flow span,.chem-mole{padding:.8rem;border:2px solid #292522;border-radius:12px;background:#fff}.chem-flow .selected{background:#92cbbd;transform:rotate(-3deg)}

.chem-worked{border:2px solid #21453e;background:#e7f4dc}.chem-worked li,[data-chem-reasoning] li{margin:.8rem 0;line-height:1.65}[data-chem-reasoning]{background:#fff3dd;border-radius:12px;padding:0 1rem}[data-chem-reasoning]:empty{display:none}

.history-card{background:#cedbf0;transform:rotate(1deg)}.history .sidebar{background:#cedbf0}.hist-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}.hist-figure img{width:100%;height:auto}.history-timeline{display:flex;flex-wrap:wrap;gap:.5rem}.history-timeline button[aria-pressed=true]{background:#cedbf0}.history-source blockquote{border-left:4px solid #31496b;padding-left:1rem}.history-written{padding:1rem 0;border-top:1px solid #9caabb}.history-source{background:#edf0ff}

.hist-story{border-top:6px solid #c65c37}.hist-story p{font-size:1.1rem;line-height:1.8;max-width:75ch}.hist-caution{padding:16px;border-radius:12px;background:#fff0ce;line-height:1.6}.hist-geography img,.hist-causal img{display:block;width:100%;height:auto;border-radius:14px;margin:16px 0}.hist-geography small{display:block;line-height:1.6}.history .hist-geography [aria-pressed="true"]{background:#244c44;color:white}.hist-causal summary{cursor:pointer;font-weight:700;padding:12px 0}@media(max-width:600px){.hist-story p{font-size:1rem}.hist-causal img{display:none}.hist-causal-mobile{display:grid!important;gap:10px}.hist-causal-mobile div{background:#e5ebdb;padding:14px;border-radius:12px}.hist-causal-mobile div:nth-child(2){background:#f6dfb4}.hist-causal-mobile div:nth-child(3){background:#dbe9ed}.hist-geography .history-timeline{display:flex;flex-wrap:wrap}}

.hist-causal-mobile{display:none}