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@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
/* Junior self-study edition */
[hidden]{display:none!important}textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px;resize:vertical;max-width:100%}.chapter,.shelf,.card-body,.activity,.quiz,.prediction,.contents,.chapter-nav a{overflow-wrap:anywhere}.reader-layout>*,.reflection-columns>*,.concept-cards>*,.filter-row>*{min-width:0}.learning-path{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:28px 30px;margin:30px 0 38px}.learning-path h2{font-size:28px;margin-top:5px}.learning-path>p{font-size:15px;color:var(--muted);max-width:780px}.learning-path ol{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;padding:0;margin:22px 0 0}.learning-path li{min-width:0}.learning-path a{display:flex;gap:10px;padding:12px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-size:14px;line-height:1.65;height:100%}.learning-path a:hover{border-color:var(--gold)}.learning-path a>span{color:var(--gold);font:600 19px/1.6 sans-serif}.learning-path small{display:block;color:var(--muted);font-size:11px}.junior-cover{display:flex;flex-direction:column;justify-content:space-between;align-items:flex-start;padding:24px;background:linear-gradient(135deg,var(--night),#274859);color:#f6efdb}.cover-number{font:500 36px/1.1 ui-monospace,monospace;letter-spacing:2px;color:#d6bd88}.cover-ideas{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}.cover-ideas span{padding:4px 10px;border:1px solid #f6efdb55;border-radius:20px;font-size:13px;line-height:1.65}.legacy-read{display:inline-block;font-size:12px;line-height:1.7;color:var(--muted);border:1px solid var(--line);border-radius:5px;padding:2px 8px;margin-top:12px}.chapter-head .legacy-read{margin:0 0 16px}.preparation{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:26px 30px}.preparation>ul{padding-left:22px;margin:0 0 25px}.preparation>h3{font-size:23px}.prerequisites{margin:24px 0;border-block:1px solid var(--line);padding:18px 0}.prerequisites h3{font-size:17px}.prerequisites ul{margin:0;padding-left:22px;font-size:15px;color:var(--muted)}.key-terms{margin:14px 0 0;display:grid;gap:16px}.key-terms>div{border-left:2px solid var(--gold);padding-left:16px}.key-terms dt{font-weight:650;color:var(--ink);font-size:17px}.key-terms dd{margin:4px 0 0;font-size:15px;color:var(--muted)}.safety-note{padding:16px 20px;margin:20px 0;border-left:3px solid var(--gold);background:var(--soft);font-size:15px;line-height:1.9}.safety-note p:last-child{margin:0}.prediction{border:1px solid var(--line);border-radius:9px;padding:20px;margin:28px 0 20px;min-width:0}.prediction legend{font-weight:600;padding:0 8px;font-size:16px;max-width:100%}.prediction-options{display:grid;gap:9px}.prediction-options button{text-align:left;font-size:15px;line-height:1.7;padding:12px 15px}.prediction-options button[aria-pressed=true]{background:var(--soft);border-color:var(--gold);box-shadow:inset 3px 0 var(--gold)}#prediction-status{margin:14px 0 0}.lab-locked .lab-stage,.lab-locked .lab-readout,.junior-chapter #lab:not(.lab-observed) .lab-readout{display:none}.lab-locked .lab-controls{opacity:.4;user-select:none}.reflections{padding-top:24px;margin-top:24px;border-top:1px dashed var(--line)}.reflections h3{font-size:23px}.reflection-columns{display:grid;grid-template-columns:1fr 1fr;gap:20px}.reflection-columns label{display:block;font-size:15px}.reflection-columns label>strong{display:block;font-weight:600;margin:0 0 7px}.reflection-columns label>span{display:block;color:var(--muted);font-size:13px;line-height:1.8;margin-bottom:12px}.reflection-columns textarea{width:100%;font-size:15px;line-height:1.8;min-height:140px}.reflections .small-note:last-child{margin:10px 0 0;min-height:1.8em}.concept-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin:22px 0}.concept-cards>section{padding:22px 20px;background:var(--surface);border:1px solid var(--line);border-radius:10px}.concept-cards section>span{font:13px/1.5 ui-monospace,monospace;letter-spacing:2px;color:var(--gold)}.concept-cards h3{font-size:22px;margin-top:10px}.concept-cards p{font-size:15px;line-height:1.9;margin:0}.junior-chapter #atlas .takeaways{margin-top:24px}.original-atlas-note{background:var(--soft);border-left:3px solid var(--gold);padding:16px 20px;margin-bottom:20px}.original-atlas-note p:last-child{margin:0}.original-quiz{margin:25px 0}.completion button{flex-shrink:0}.aux-row{margin:0}.quiz{min-width:0}.quiz legend{max-width:100%}
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@media(max-width:480px){.site-head{padding:15px}.site-head nav{gap:10px}.brand{font-size:16px;letter-spacing:.5px}.brand small{letter-spacing:1px}.brand-mark{font-size:24px}.site-head nav button{min-width:35px}.learning-path{padding:20px 16px}.learning-path ol{grid-template-columns:1fr;gap:8px}.learning-path a{align-items:center;padding:10px 12px}.learning-path small{display:inline;margin-right:8px}.shelf-title h1{font-size:34px}.preparation{padding:20px 16px}.chapter-head h1{font-size:32px}.quiz legend{padding:0 5px;font-size:16px}.lab-controls label{min-width:0;width:100%;flex-basis:100%}.lab-controls button{min-width:0;flex-basis:auto}.activity-instructions li{min-width:0}.story{padding-left:14px}.story .connection{padding:14px}.chapter-nav{grid-template-columns:1fr}.chapter-nav .next{text-align:left}.filter-row{flex-wrap:wrap}.filter-row input{flex-basis:100%;width:100%}.filter-row select{max-width:100%;width:100%}.site-foot{font-size:11px}.jump-links{gap:8px}.jump-links a{padding:5px 10px}.atlas-figure figcaption{flex-wrap:wrap;gap:5px}.viewer-top{gap:10px}.viewer-top strong{overflow-wrap:anywhere}.summary-line{gap:10px 18px}.summary-line b{font-size:20px}.cover-number{font-size:34px}}
/* A first prediction is recorded before any explanatory chapter DOM is built. */
.prediction-gate-layout{max-width:1060px;padding:40px;margin:auto}.prediction-gate-layout>.chapter{margin:auto}.prediction-entry{max-width:940px}.prediction-entry>.prediction{background:var(--surface);margin:24px 0}.prediction-entry .gate-intro{max-width:750px;color:var(--muted)}.prediction-context{border-left:3px solid var(--gold);background:var(--soft);padding:20px 24px;margin:22px 0;font-size:16px;line-height:1.9}.prediction-context p:last-child{margin:0}.prediction-previous-note{padding:16px 20px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font-size:14px;color:var(--muted)}.gate-back{font-size:14px;margin-top:24px}.learning-boundary{padding:24px 28px;margin:40px 0;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:9px}.learning-boundary h3{font-size:24px}.learning-boundary p,.learning-boundary li{font-size:15px;line-height:1.9}.learning-boundary ul{padding-left:22px}.learning-boundary .small-note{font-size:13px;margin-bottom:0}
@media(max-width:760px){.prediction-gate-layout{padding:25px 20px}.prediction-entry h2{font-size:27px}.prediction-context{padding:16px 18px;font-size:15px}.learning-boundary{padding:20px}.learning-boundary h3{font-size:22px}}
@media(max-width:480px){.prediction-gate-layout{padding:25px 20px}.prediction-entry{margin-top:28px}.prediction-gate-layout .prediction{padding:16px 12px}.prediction-gate-layout .prediction legend{font-size:16px}.prediction-context{padding:14px 16px}.prediction-previous-note{padding:14px 16px}.learning-boundary{padding:18px 16px}}
.prediction-recorded .prediction-options button:disabled{opacity:1;cursor:default;color:var(--muted);background:var(--surface)}.prediction-recorded .prediction-options button[aria-pressed=true]:disabled{color:var(--ink);background:var(--soft);font-weight:600;border-color:var(--gold);box-shadow:inset 3px 0 var(--gold)}.prediction-original-choice{display:block;font-size:12px;line-height:1.7;color:var(--gold);font-weight:650;margin-bottom:4px}