@import url('./ui-tokens.css');
/* Layout and readable prose only. Scientific SVG/image palettes stay component-owned. */
body.subject-page{--ink:var(--ui-ink);--muted:var(--ui-muted);--paper:var(--ui-paper);--line:var(--ui-line);font-family:var(--ui-font)}
.subject-page > #workspace{grid-template-columns:256px minmax(0,1fr)}
.subject-page > .app-header{border-bottom-color:var(--ui-line)}
.subject-page .booknav{padding:28px 20px;top:var(--ui-header-height);height:calc(100vh - var(--ui-header-height));background:#fff}
.subject-page .booknav h1{font:700 1.5rem/1.3 var(--ui-font);letter-spacing:-.03em;margin:12px 0}
.subject-page .booknav>p:not(.overline){font-size:.875rem}
.subject-page .booknav .overview{margin:12px 0 8px}
.subject-page #chapters button{font-size:.875rem;min-height:48px;padding:14px 8px;border-radius:8px;border-top:0;margin:3px 0}
.subject-page #chapters button.selected{box-shadow:inset 3px 0 var(--accent);font-weight:600}
.subject-page #chapters button small{color:#735629}
.subject-page .content{padding:28px clamp(24px,4vw,64px);max-width:1360px;width:100%;margin-inline:auto}
.subject-page #crumbs{gap:6px;font-size:.8125rem;line-height:1.5}
.subject-page #crumbs button{min-height:36px;padding:7px 3px;max-width:100%;text-align:left}
.subject-page .heading{margin:28px 0 24px;align-items:center}
.subject-page .heading h2{font:700 clamp(1.75rem,3.4vw,2.75rem)/1.18 var(--ui-font);letter-spacing:-.035em;margin:10px 0;overflow-wrap:anywhere}
.subject-page .heading p:last-child{font-size:.9375rem;line-height:1.65;max-width:var(--ui-reading)}
.subject-page #catalog{gap:16px}
.subject-page .catalog-card{padding:24px;min-height:180px;border-radius:var(--ui-radius);box-shadow:0 2px 8px #20343b04;transition:border-color .15s,box-shadow .15s}
.subject-page .catalog-card h3{font:700 1.2rem/1.4 var(--ui-font);letter-spacing:-.02em;margin:12px 0}
.subject-page .catalog-card p{font-size:.9375rem;line-height:1.65}
.subject-page .catalog-card b{font-size:.8125rem;color:var(--accent)}
.subject-page .catalog-card.in-preparation{background:#f1f3f2;color:var(--ui-muted)}
.subject-page .catalog-card.in-preparation b{color:#735629}
.subject-page #lesson{max-width:1040px;padding-bottom:36px}
.subject-page #lesson > h2,.subject-page #lesson :is(.cr-topline,.rj-topline) h2{font:700 clamp(1.8rem,3.6vw,2.8rem)/1.2 var(--ui-font);letter-spacing:-.035em;margin:16px 0 20px;overflow-wrap:anywhere}
.subject-page #lesson > h3,.subject-page #lesson > section > h3{font:700 clamp(1.25rem,2.3vw,1.65rem)/1.4 var(--ui-font);letter-spacing:-.02em;margin:36px 0 14px}
.subject-page #lesson :is(.exam,.event-story,.photo-atlas) h3{font:700 1.3rem/1.4 var(--ui-font);margin:14px 0}
.subject-page #lesson > :is(p,ul,ol),.subject-page #lesson > section > :is(p,ul,ol){max-width:var(--ui-reading)}
.subject-page #lesson .lead{font-size:1.0625rem;line-height:1.8;color:var(--ui-muted)}
.subject-page #lesson :is(p,li){line-height:1.8}
.subject-page #lesson .overline{font-size:.75rem;letter-spacing:.1em;line-height:1.6}
.subject-page #lesson .section-nav{gap:8px;margin:20px 0 28px}
.subject-page #lesson .section-nav button{border-radius:8px;font-weight:600}
.subject-page #lesson :is(.lesson-visual,.concept-visual){border:1px solid var(--ui-line);border-radius:var(--ui-radius);padding:24px;margin-block:28px}
.subject-page #lesson :is(.exam,.math-example){border-radius:var(--ui-radius);padding:24px;margin-block:24px}
.subject-page #lesson :is(.exam,.math-example) :is(textarea,select,input:not([type=radio]):not([type=checkbox])){font-size:1rem;line-height:1.6;border-color:#899c9b;max-width:100%}
.subject-page #lesson details summary{min-height:44px;line-height:1.6;padding-block:10px}
.subject-page #lesson .lesson-actions{gap:10px;border-top:1px solid var(--ui-line);padding-top:24px}
.subject-page #lesson .lesson-actions button{border-radius:8px;min-height:44px;font-size:.875rem}
.subject-page #lesson .lesson-actions button:not(:last-child){background:#fff;color:var(--accent)}
.subject-page #lesson [tabindex='-1']:focus{outline:2px solid var(--accent);outline-offset:6px;border-radius:4px}
.subject-page :is(button,a,input,select,textarea,summary,[tabindex]){scroll-margin-block:calc(var(--ui-header-height) + 20px) 28px}
.subject-page #lesson iframe{max-width:100%}
.subject-page[data-level=lesson]:has(#lesson h2) .heading>div{display:none}
.subject-page[data-level=lesson]:has(#lesson h2) .heading{margin:8px 0 16px;justify-content:flex-end}
.subject-page .backbutton{min-height:44px;border-radius:8px;font-size:.8125rem;padding:9px 14px}
.subject-page .chapter-toggle{min-height:44px;border:1px solid var(--ui-line);border-radius:8px;background:#fff;color:var(--accent);font-size:.8125rem;font-weight:600;padding:10px 12px;cursor:pointer}
.subject-page .chapter-toggle::after{content:'⌄';display:inline-block;margin-left:8px}
.subject-page .chapter-toggle[aria-expanded=true]::after{transform:rotate(180deg)}
@media(max-width:1050px) and (min-width:901px){.subject-page .booknav{height:auto;position:static}}
@media(max-width:900px){
 .subject-page > #workspace{grid-template-columns:minmax(0,1fr)}
 .subject-page .booknav{position:static;height:auto;padding:12px 24px;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px}
 .subject-page .booknav>p{display:none}
 .subject-page .booknav h1{font-size:1rem;margin:0}
 .subject-page .chapter-panel{grid-column:1/-1;max-height:60vh;overflow:auto;padding-bottom:8px}
 .subject-page #chapters{grid-template-columns:repeat(2,minmax(0,1fr))}
 .subject-page .content{padding:24px}
}
@media(max-width:560px){
 .subject-page .booknav{padding:10px 16px}
 .subject-page #chapters{grid-template-columns:1fr}
 .subject-page .content{padding:20px 16px}
 .subject-page #catalog{grid-template-columns:1fr}
 .subject-page .catalog-card{min-height:0;padding:20px}
 .subject-page #lesson :is(.lesson-visual,.concept-visual,.exam,.math-example){padding:16px}
 .subject-page #lesson .photo-atlas{padding:20px}
 .subject-page #lesson :is(.lab-controls,.lab-result){padding:22px}
 .subject-page #lesson .lesson-actions button{flex:1 1 auto}
}
@media(prefers-reduced-motion:reduce){.subject-page *{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

/* Catalogue navigation uses the same visible focus as lesson navigation. */
.subject-page #title:focus{outline:2px solid var(--accent);outline-offset:6px;border-radius:4px}
.subject-page .chapter-toggle[hidden]::after{content:none}