.experiment-page{--bg:#0b1118;--panel:#101a22;--text:#edf1ed;--muted:#aab8be;--line:#ffffff24;--serif:WorldSerif,Georgia,serif}.experiment-page .app{max-width:1800px;min-height:0}.experiment-page .site-header{max-width:none}.experiment-page .site-brand{color:var(--site-text)}.experiment-page .site-header .sound-button{font-size:14px;margin-left:10px;color:var(--site-muted)}.experiment-breadcrumb{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:18px;font-size:14px;color:var(--site-muted)}.experiment-breadcrumb>div{display:flex;flex-wrap:wrap;gap:10px}.experiment-breadcrumb a:hover{color:var(--site-accent)}.controls-jump{white-space:nowrap;color:var(--site-accent)}.experiment-page .workspace{min-height:740px}.experiment-page .console{background:#0b1118}.experiment-page .scene{min-height:740px}.experiment-page .control-title{font-size:32px}.experiment-page .control-description{font-size:16px}.experiment-page .primary-button{line-height:1.4}.experiment-page .secondary-button{line-height:1.4}.experiment-page .science-button{font-size:15px}.experiment-page .quiet-button{font-size:14px}.experiment-page .scene-footer .quiet-button{font-size:13px}.experiment-strip{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:18px 3.7%;border-bottom:1px solid var(--site-line);font-size:14px;color:var(--site-muted)}.experiment-strip p{line-height:1.6}.experiment-page .scene-heading h1{font-family:var(--world-serif)}.learn-section{padding-block:82px 30px}.learn-header{display:flex;justify-content:space-between;gap:30px;align-items:flex-end}.learn-header h2{font-size:58px;max-width:750px;margin-bottom:0}.learn-header .text-link{white-space:nowrap}.lesson-intro{max-width:840px;margin-top:30px;color:#c2ccd2;font-size:18px;line-height:1.8}.lesson-intro p+p{margin-top:18px}.lesson-intro a,.concept-section a,.model-content a{color:var(--site-accent);text-decoration:underline;text-underline-offset:4px}.guided-section{padding-block:60px;border-bottom:1px solid var(--site-line)}.guided-section>h3,.concept-section>h3{font:39px/1.2 var(--world-serif);letter-spacing:-.7px;margin:18px 0 27px}.guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.guide-card{background:var(--site-panel);border:1px solid var(--site-line);padding:28px;display:flex;flex-direction:column;align-items:flex-start;min-width:0}.guide-number{color:var(--site-accent);font-size:12px;letter-spacing:1px}.guide-card h3{font:29px/1.2 var(--world-serif);margin:20px 0 15px}.guide-card p{font-size:16px;line-height:1.65;color:var(--site-muted);margin-bottom:27px}.guide-button{display:flex;gap:17px;align-items:center;justify-content:space-between;color:var(--site-accent);border:0;border-bottom:1px solid #e9c78566;background:transparent;padding:10px 0;font-size:14px;line-height:1.5;text-align:left;margin-top:auto;width:100%;min-height:44px}.guide-button:hover{color:#ffe3ad;border-color:#ffe3ad}.concept-section{padding-block:42px 36px}.concept-section>p{max-width:850px;color:#c2ccd2;font-size:17px;line-height:1.8;margin-block:20px}.concept-section>h3{margin-top:0}.energy-panel{display:grid;grid-template-columns:1.2fr 1fr;align-items:center;background:#101923;border:1px solid var(--site-line);padding:32px;margin:30px 0;gap:36px}.energy-diagram{color:#b0bcc7}.energy-diagram svg{width:100%;height:auto;display:block;max-width:500px}.energy-diagram text{font-family:var(--world-sans);font-size:15px;fill:#c4d0d9}.energy-diagram p{font-size:12px;color:var(--site-muted);line-height:1.5}.energy-values{border-left:1px solid var(--site-line);padding-left:32px}.energy-values h3{font:32px/1.2 var(--world-serif);margin:14px 0}.energy-values .live-energy{color:var(--site-text);font:30px/1.5 var(--world-serif)}.live-energy>span[aria-hidden]{font-size:22px;color:var(--site-muted);margin:0 10px}.energy-values p:not(.kicker):not(.live-energy):not(.equation-inline){font-size:14px;line-height:1.6;color:var(--site-muted)}.live-energy small{font:14px/1.5 var(--world-sans)}.energy-values .equation-inline{font:23px/1.5 var(--world-serif);color:var(--site-accent);margin-block:12px}.science-detail{border-top:1px solid var(--site-line);font-size:16px}.science-detail>summary{cursor:pointer;padding:23px 30px 23px 0;font-size:17px;line-height:1.5;font-weight:500;position:relative;list-style:none}.science-detail>summary::-webkit-details-marker{display:none}.science-detail>summary:after{content:'+';position:absolute;right:0;top:19px;font-size:24px;color:var(--site-accent);font-weight:400}.science-detail[open]>summary:after{content:'−'}.science-detail>div{padding:0 0 27px;max-width:900px;color:#b7c4cd;font-size:16px;line-height:1.8}.science-detail>div>p+p{margin-top:18px}.model-content h2{font-size:36px;margin:8px 0 23px}.model-content h3{font:28px/1.25 var(--world-serif);color:var(--site-text);margin:30px 0 16px}.model-content p{margin-block:15px}.model-content .equation{overflow:auto;font-family:var(--world-serif);font-size:24px;line-height:1.8;padding:23px 27px;background:var(--site-panel);border-left:2px solid var(--site-accent);color:var(--site-text);margin-block:24px}.model-content .small{font-size:15px;color:var(--site-muted)}.model-content .sources{border-top:1px solid var(--site-line);margin-top:30px;padding-top:20px;font-size:15px}.model-content .sources a{display:block;margin-top:9px}.takeaway{border-block:1px solid var(--site-line);padding-block:29px 35px;margin-block:35px}.takeaway>p:last-child{font:30px/1.45 var(--world-serif);max-width:900px;color:var(--site-text);margin-top:17px}.concept-pair{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin:25px 0}.concept-pair>div{padding:30px;border:1px solid var(--site-line);background:var(--site-panel)}.concept-pair h3{font:29px/1.3 var(--world-serif);margin:18px 0}.concept-pair p:not(.kicker){font-size:16px;color:var(--site-muted)}.lesson-callout{border-left:2px solid var(--site-accent);padding:10px 0 10px 25px;margin-block:30px;max-width:870px;font-size:16px}.lesson-callout strong{font-weight:500;color:var(--site-text)}.lesson-callout p{color:var(--site-muted);margin-top:11px}.comparison-table{overflow:auto;margin-block:27px}.comparison-table table{border-collapse:collapse;width:100%;max-width:950px;font-size:16px}.comparison-table caption{text-align:left;color:var(--site-muted);font-size:14px;margin-bottom:18px}.comparison-table th,.comparison-table td{text-align:left;border-bottom:1px solid var(--site-line);padding:18px 20px;vertical-align:top}.comparison-table th{background:var(--site-panel);font-size:14px;font-weight:500;color:var(--site-accent)}.comparison-table td{color:#c5cfd5}.comparison-table td:first-child{min-width:160px;font-variant-numeric:tabular-nums;color:var(--site-text)}.experiment-page .related-fields{border-top:0}.experiment-page .noscript{font-size:16px;line-height:1.7}.experiment-page [data-mode=decay] .scene{min-height:970px}.experiment-page a.text-link{color:var(--site-accent)}
@media(max-width:1150px){.energy-panel{gap:23px;padding:25px}.energy-values{padding-left:25px}.energy-values .live-energy{font-size:26px}.live-energy>span[aria-hidden]{margin:0 6px}.guide-card{padding:23px}.learn-header h2{font-size:49px}.learn-header{align-items:flex-start}.learn-header .text-link{margin-top:26px}}
@media(max-width:760px){.experiment-page .site-nav a:last-child{display:none}.experiment-page .site-header .sound-button{margin-left:0;gap:0;width:32px;justify-content:center;padding:12px 0}.experiment-page #sound-label{display:none}.experiment-page .site-header{gap:22px}.experiment-page .site-nav{gap:15px}.experiment-breadcrumb{display:block;padding-block:16px;font-size:13px}.experiment-breadcrumb>div{gap:7px}.controls-jump{display:inline-block;margin-top:10px;font-size:14px}.experiment-page .scene{min-height:550px}.experiment-page [data-mode=gravity] .scene{height:610px;min-height:610px}.experiment-page [data-mode=decay] .scene{min-height:970px;height:970px}.experiment-strip{display:block;padding:22px}.experiment-strip .quiet-button{margin-top:12px;font-size:14px}.learn-section{padding-top:56px}.learn-header{display:block}.learn-header h2{font-size:44px}.learn-header .text-link{margin-top:20px}.lesson-intro{font-size:17px;margin-top:25px}.guided-section{padding-block:42px}.guided-section>h3,.concept-section>h3{font-size:34px}.guide-grid{grid-template-columns:1fr;gap:18px}.guide-card{padding:25px}.guide-card h3{font-size:29px;margin:14px 0}.guide-card p{margin-bottom:20px}.guide-button{font-size:15px}.energy-panel{grid-template-columns:1fr;padding:23px;gap:25px}.energy-values{border-left:0;border-top:1px solid var(--site-line);padding:24px 0 0}.energy-values .live-energy{font-size:32px}.energy-diagram svg{max-width:100%}.energy-diagram text{font-size:17px}.concept-pair{grid-template-columns:1fr;gap:18px}.concept-pair>div{padding:25px}.concept-section>p{font-size:16px}.science-detail>summary{font-size:16px}.takeaway>p:last-child{font-size:27px}.model-content h2{font-size:32px}.model-content .equation{font-size:21px;padding:20px;white-space:normal}.comparison-table th,.comparison-table td{padding:15px 12px;font-size:15px}.comparison-table td:first-child{min-width:115px}}

.chain-legend{font-size:14px;gap:9px 18px}
.chain-legend .trace-swatch{display:inline-flex;align-items:center;justify-content:center;min-width:24px;margin-right:5px;border-bottom:2px solid var(--isotope);font-size:15px;line-height:1.15;padding-bottom:3px}
.stable-plot-note{font-size:14px;line-height:1.55;color:#c2b2e5;margin-top:11px}
.population-table tfoot th,.population-table tfoot td{border-top:2px solid #f5f0df77;color:#f5f0df;font-weight:500;padding-block:12px}
.population-table tbody th{white-space:normal}

/* Let added legends and activity totals grow the decay stage on narrow screens. */
.experiment-page [data-mode=decay] .scene{height:auto;max-height:none}