:root{color-scheme:dark;--bg:#0d1420;--panel:#172334;--text:#eef4ff;--muted:#b5c6db;--line:#455d77;--accent:#9cccec;--warm:#efb68f;--control:#22344a;--selected:#284e65;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
:root[data-theme=light]{color-scheme:light;--bg:#edf2f6;--panel:#fff;--text:#193043;--muted:#405a6b;--line:#a5b9c9;--accent:#006a95;--warm:#92461b;--control:#f2f6fa;--selected:#d7edf7}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:16px;line-height:1.6}header{padding:20px max(16px,env(safe-area-inset-left));display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);align-items:center;flex-wrap:wrap}h1{font-size:clamp(1.4rem,3vw,2rem);margin:0}h2{font-size:1.2rem;margin:0 0 12px}h3{font-size:1rem}small,.source,.intro{color:var(--muted)}main{max-width:1600px;margin:auto;padding:18px max(14px,env(safe-area-inset-right)) 110px}p{overflow-wrap:anywhere}button,input,select,textarea{font:inherit;color:var(--text);background:var(--control);border:1px solid var(--line);border-radius:9px;min-height:46px;max-width:100%}button{padding:8px 13px;cursor:pointer;margin:3px;white-space:normal;touch-action:manipulation}button:hover,button[aria-pressed=true]{background:var(--selected);border-color:var(--accent)}button:disabled,input:disabled,select:disabled{opacity:.55;cursor:default}:focus-visible{outline:3px solid var(--accent);outline-offset:3px}input,select,textarea{padding:9px 10px;width:100%}textarea{resize:vertical}label{display:block;margin:10px 0}label>input,label>select,label>textarea{display:block;margin-top:5px}.stations{display:flex;flex-wrap:wrap;margin:14px 0}.workbench{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:18px;align-items:start}.panel{padding:20px;border:1px solid var(--line);background:var(--panel);border-radius:16px;min-width:0;margin-bottom:18px}.controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(220px,100%),1fr));gap:4px 14px}.controls>details,.controls>fieldset{grid-column:1/-1}.scene{min-height:250px}.scene svg{display:block;width:100%;max-height:320px}svg text{fill:var(--text);font-size:15px}.track{fill:none;stroke:var(--accent);stroke-width:3}.secondary{fill:none;stroke:var(--warm);stroke-width:3;stroke-dasharray:8 5}.heat{fill:none;stroke:var(--warm);stroke-width:5}.wall{fill:var(--muted);opacity:.6}.nucleus{fill:var(--warm)}.atom{fill:none;stroke:var(--accent);stroke-dasharray:4 5}.metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(145px,100%),1fr));gap:9px}.metric{background:var(--control);border-radius:10px;padding:12px;overflow-wrap:anywhere}.metric span{font-size:.84rem;display:block;color:var(--muted)}.metric strong{font-size:1.4rem;color:var(--accent);display:block}.notation{font-size:5rem;text-align:center;padding:10px}.notation sup,.notation sub{font-size:2rem}.check{display:flex;gap:10px;align-items:flex-start;border-bottom:1px solid var(--line);padding:7px 0;min-height:46px}.check input{width:24px;height:24px;min-height:24px;flex:none;margin:4px 0}.check small{display:block}fieldset{border:1px solid var(--line);border-radius:10px;padding:10px;min-width:0}legend{padding:0 5px}table{border-collapse:collapse;width:100%;font-size:.93rem}th,td{text-align:left;padding:9px;border-bottom:1px solid var(--line);overflow-wrap:anywhere;vertical-align:top}.table-wrap{max-width:100%;overflow:auto;max-height:450px}thead{background:var(--control)}.table-wrap table{min-width:480px}.criterion,.limit{border-left:3px solid var(--warm);padding:10px 12px;background:var(--control)}.equation,.energy-ledger,.concept-title{font-size:1.35rem;text-align:center;padding:22px 8px;border:1px solid var(--line);border-radius:12px;overflow-wrap:anywhere}.particles{display:flex;gap:5px;flex-wrap:wrap;margin-top:20px}.particles span{border-radius:50%;height:28px;width:28px;text-align:center;border:1px solid var(--line);font-size:.8rem}.parent{background:var(--selected);color:var(--accent)}.daughter{background:var(--control);color:var(--muted)}.chain,.flow,.progress{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.chain span,.flow span,.progress span{padding:8px;background:var(--control);border:1px solid var(--line);border-radius:9px}.chain b{display:block;font-size:1.4rem}.fact{padding:14px 0;border-bottom:1px solid var(--line)}.bars span{display:block;background:var(--selected);padding:6px;margin:8px 0;min-width:120px}.feedback{padding:12px;background:var(--panel);border:1px solid var(--accent);border-radius:9px;min-height:48px}summary{min-height:46px;cursor:pointer;padding:8px}.run-controls{display:flex;align-items:end;flex-wrap:wrap;gap:8px}.run-controls label{min-width:120px}.header-actions{display:flex;flex-wrap:wrap}.pylab-sound{z-index:4}select[multiple]{min-height:135px}
@media(max-width:1099px){.workbench{grid-template-columns:1fr}.scene{min-height:0}.panel{padding:16px}}@media(max-width:600px){header{padding:14px}main{padding:12px 10px 110px}.panel{padding:12px}.controls{grid-template-columns:1fr}.header-actions button{font-size:.9rem}table{font-size:.87rem}.scene svg{min-height:170px}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.metric strong{font-size:1.2rem}.stations button{flex:1 1 135px}.check{line-height:1.5}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

.evidence-fields{margin:0;min-width:250px}.evidence-fields>div{padding:6px 0;border-bottom:1px solid var(--line)}.evidence-fields dt{font-weight:600}.evidence-fields dd{margin:0;color:var(--accent)}.evidence-source{display:block;color:var(--muted);font-size:.8em;line-height:1.45;max-width:55ch}.evidence-fields>div:last-child{border:0}