*{box-sizing:border-box} :root{font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#243c3b;background:#f6f8f5;color-scheme:light;--surface:#fff;--line:#dbe4de;--muted:#536b65;--mint:#edf7f1;--lavender:#f2f0fa;--sand:#faf5e9;--button:#fff;--accent:#176647}
body{margin:0} main{max-width:1440px;margin:auto;padding:22px}button,input,select{font:inherit}button,select{color:inherit}button{cursor:pointer;border:1px solid var(--line);border-radius:12px;background:var(--button);padding:10px 12px;font-size:12px;font-weight:650;min-height:40px}button:hover{border-color:var(--accent)}button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:white}button:disabled{opacity:.45;cursor:default}:focus-visible{outline:3px solid #ca9400;outline-offset:3px}h1,h2,h3,p{margin:0}h1{font-size:26px;letter-spacing:-.7px;margin-top:4px}h2{font-size:17px;margin-top:4px}h3{font-size:14px;margin-bottom:8px}p{font-size:12px;line-height:1.65}.eyebrow,.step{font-size:10px;text-transform:uppercase;letter-spacing:1.5px;font-weight:750;color:var(--muted)}.eyebrow span{padding-inline:3px}.masthead{display:flex;gap:16px;justify-content:space-between;align-items:center;margin-bottom:20px;padding-inline-end:110px}.element{display:flex;align-items:center;gap:10px;font-size:11px;max-width:220px}.element b{display:grid;place-items:center;border:1px solid #c3dccc;border-radius:12px;width:42px;height:44px;background:var(--mint);font-size:24px;flex-shrink:0}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 306px;gap:14px;align-items:start}.card{border:1px solid var(--line);border-radius:16px;background:var(--surface);min-width:0;overflow:hidden}.viewer-heading{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:18px 20px}.state-tag{padding:7px 14px;border-radius:10px;background:var(--mint);font-size:18px;font-weight:750;direction:ltr}.stage{position:relative;background:#0d2028;margin:0 10px;border-radius:12px;overflow:hidden;height:425px;color:#cae0e3}.stage canvas{width:100%;height:100%;display:block;touch-action:pan-y;cursor:grab}.stage canvas:active{cursor:grabbing}.stage-note{position:absolute;top:14px;inset-inline:16px;font-size:10px;color:#b5cdd0;pointer-events:none}.legend{position:absolute;bottom:13px;inset-inline-start:16px;display:flex;gap:14px;flex-wrap:wrap;font-size:10px;pointer-events:none;max-width:65%}.legend span{display:flex;align-items:center;gap:5px}.legend i{width:6px;height:6px;border-radius:50%;display:inline-block}.positive{background:#73ddd0}.negative{background:#b5a2f1}.legend [hidden]{display:none}.scale{position:absolute;bottom:13px;inset-inline-end:16px;border-bottom:2px solid #b5cdd0;padding-bottom:4px;font-size:10px;text-align:center;direction:ltr;pointer-events:none}.view-actions{display:flex;gap:7px;align-items:center;flex-wrap:wrap;padding:12px 18px}.view-actions label{display:flex;align-items:center;gap:8px;font-size:11px;margin-inline-start:auto}.view-actions input{width:100px;accent-color:var(--accent)}.caption{padding:0 20px 17px;color:var(--muted);min-height:56px}.controls{display:grid;gap:12px}.controls .card{padding:17px}.mint{background:var(--mint)}.lavender{background:var(--lavender)}.sand{background:var(--sand)}.step{margin-bottom:12px;letter-spacing:1px}.orbitals{display:grid;grid-template-columns:1fr 1fr;gap:7px}.orbitals button{text-align:start;padding:10px}.orbitals b{display:block;font-size:20px;line-height:1.2;direction:ltr}.orbitals span{display:block;font-size:10px;margin-top:5px;line-height:1.4}.orbitals sub{font-size:11px}.controls p{margin-top:12px}.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;border-top:1px solid var(--line);padding-top:12px;margin-top:12px}.stats span{display:block;font-size:10px;color:var(--muted)}.stats strong{display:block;font-size:16px;margin-top:3px;direction:ltr}.modes{display:flex;flex-wrap:wrap;gap:6px}.modes button{font-size:11px;flex:1;padding:8px;line-height:1.35}.check{display:flex;gap:8px;align-items:center;font-size:12px;line-height:1.5;margin-top:12px;cursor:pointer}.check input{width:17px;height:17px;accent-color:var(--accent);flex-shrink:0}.small{font-size:11px;color:var(--muted)}.measure-buttons{display:flex;gap:5px;flex-wrap:wrap;margin-top:14px}.measure-buttons button{font-size:11px}output{display:block;font-size:12px;margin-top:10px;color:var(--muted)}.learning{margin-top:14px;padding:17px 20px}summary{cursor:pointer;font-size:13px;font-weight:700}.learning-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:20px}.learning p{color:var(--muted)}.sources{margin-top:18px;font-size:11px}a{color:var(--accent);text-underline-offset:3px}footer{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 3px;font-size:10px;color:var(--muted)}.language-label{display:flex;align-items:center;gap:8px}select{max-width:170px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:7px;font-size:11px}#load-error{color:#a92121;padding:20px}
@media(min-width:1180px){.stage{height:470px}}@media(max-width:820px){main{padding:14px}.workspace{grid-template-columns:1fr}.controls{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.controls .card{padding:13px}.stage{height:370px}.masthead{padding-inline-end:0}.modes{flex-direction:column}.learning-grid{gap:16px}.stats strong{font-size:14px}}
@media(max-width:560px){main{padding:10px}.masthead{align-items:flex-start;margin-bottom:14px}.masthead h1{font-size:23px}.element{max-width:120px;font-size:10px}.element b{width:34px;height:38px;font-size:21px}.eyebrow{font-size:9px}.controls{grid-template-columns:1fr}.controls .card{padding:16px}.orbitals{grid-template-columns:repeat(4,minmax(0,1fr))}.orbitals button{padding:9px 7px}.orbitals b{font-size:18px}.orbitals span{font-size:9px}.stage{height:330px;margin:0 6px}.viewer-heading{padding:14px}.stage-note{font-size:9px;max-width:95%}.view-actions{padding:10px;gap:6px}.view-actions label{margin-inline-start:0;flex:1}.view-actions input{width:80px;max-width:100%}.caption{padding:0 14px 14px}.modes{flex-direction:row}.learning-grid{grid-template-columns:1fr}.legend{font-size:9px;max-width:60%}.stats{grid-template-columns:1fr 1fr}.learning{padding:16px}.scale{font-size:9px}footer>span{max-width:110px}}
@media(prefers-color-scheme:dark){:root{color:#e0eae5;background:#14221e;color-scheme:dark;--surface:#1b2c27;--line:#395046;--muted:#b1c5bc;--mint:#20392d;--lavender:#302e40;--sand:#383426;--button:#20332c;--accent:#2b7857}.element b{border-color:var(--line)}a{color:#9cdbbc}}
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