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.secondary{white-space:nowrap}.primary+.secondary{margin-top:8px}@media(max-width:1250px){.reader-layout{grid-template-columns:minmax(0,1fr) 285px;gap:14px}.book-help{padding:18px}.book-help h2{font-size:27px}.reader-content{padding:24px}.hotspot>span{font-size:8px;padding:2px 4px}}@media(max-width:1000px){.reader-layout{grid-template-columns:1fr}.book-canvas{height:auto;min-height:0;max-height:80vh}.book-help{height:auto;max-height:none;min-height:0}.reader-heading h1{font-size:32px}.section-picker{display:grid;grid-template-columns:1fr 1fr}.hotspot>span{font-size:10px}.reader-hint{max-width:600px}.reader-content{padding:24px 20px}.book-help h2 br{display:none}}@media(max-width:520px){.reader-toolbar{flex-wrap:wrap;gap:10px;padding:10px}.zoom-controls{margin-left:auto}.reader-heading{align-items:flex-start;flex-direction:column}.reader-heading h1{font-size:31px}.reader-heading .eyebrow{font-size:8px}.reader-content{padding:23px 14px}.section-picker{grid-template-columns:1fr}.hotspot>span{font-size:7px;padding:1px 3px;line-height:1.5}.book-canvas{padding:6px;max-height:75vh}.reader-heading .secondary{font-size:10px;padding:8px 12px}}.help-back{display:flex;justify-content:space-between;gap:10px;align-items:baseline}.help-back button{font-size:10px}.help-back #back-to-page{display:none}@media(max-width:1000px){.help-back #back-to-page{display:inline-block}}.hotspot-short,.mobile-reader-actions{display:none}#book-help-sheet{padding:0;max-width:680px;width:100%;max-height:88dvh;margin:auto auto 0;border-radius:20px 20px 0 0;overflow:auto;overscroll-behavior:contain}#book-help-sheet::backdrop{background:#17362988}.sheet-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:3}.sheet-header>span{font-size:10px;letter-spacing:1px}.sheet-header button{min-height:44px;font-size:13px;white-space:nowrap}.book-sheet-open{overflow:hidden}@media(max-width:1000px){.reader-content{padding-bottom:100px}.reader-toolbar{flex-wrap:wrap;gap:8px;border-radius:10px;padding:8px 12px}.page-controls{gap:8px;font-size:13px;flex:1}.page-controls button,.zoom-controls button{min-width:44px;min-height:44px}.page-controls input{font-size:16px;min-height:44px;width:62px}.zoom-controls{margin-left:auto}.zoom-controls button:last-child{font-size:12px}.book-canvas{max-height:none;height:auto;padding:6px;overscroll-behavior:auto}.book-help{max-height:none;min-height:0;padding:20px;border:0;border-radius:0}.book-help h2{font-size:30px}.book-help>p,.instruction,#help-body .book-item p{font-size:15px}.book-help .fine{font-size:13px!important}#help-body .book-item summary{font-size:15px;min-height:44px;padding:8px 0}.section-pick{font-size:15px;min-height:52px}.help-tabs{position:sticky;top:73px;background:#fff;z-index:2;gap:0;padding-top:4px}.help-tabs button{flex:1;min-height:48px;font-size:14px}.help-back #back-to-page{display:none}.book-help #all-sections{min-height:44px;font-size:14px;margin-bottom:8px}.audio-tools{font-size:14px}.audio-tools select{font-size:16px;min-height:44px}.audio-tools label{display:flex;align-items:center;gap:8px;margin:0;min-height:44px}.audio-unavailable .primary,.guided-link{font-size:13px;min-height:44px}.mobile-reader-actions{display:flex;position:fixed;bottom:0;left:225px;right:0;z-index:3;background:var(--paper);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));align-items:center;justify-content:space-between;gap:12px}.mobile-reader-actions button{min-height:48px;font-size:14px;flex:1;justify-content:center}.mobile-reader-actions>span{font-size:11px;color:var(--muted)}}@media(max-width:760px){.mobile-reader-actions{left:0}.reader-heading{gap:10px;margin-bottom:16px}.reader-heading h1{font-size:29px}.reader-heading .eyebrow{font-size:9px}.reader-heading .secondary{min-height:44px;display:inline-flex;align-items:center;font-size:12px}.reader-content{padding:20px 12px 110px}.reader-toolbar{justify-content:center}.page-controls{justify-content:space-between;width:100%}.zoom-controls{margin:0;justify-content:center;width:100%}.reader-layout{margin-top:12px}.hotspot-full{display:none}.hotspot>.hotspot-short{display:flex;align-items:center;justify-content:center;min-width:32px;min-height:32px;font-size:12px;padding:3px 6px;overflow:visible;max-width:none;background:#f5f8edf5;border-radius:5px;top:-1px;right:-1px}.sheet-header{padding:12px 16px}.sheet-header>span{font-size:9px}.section-picker{grid-template-columns:1fr}.mobile-reader-actions>span{display:none}#book-help-sheet .book-help{padding:18px 16px calc(24px + env(safe-area-inset-bottom))}}.book-exercise{margin-top:22px}.exercise-status{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:16px 0}.exercise-hint{background:#fff3df;border-radius:6px;padding:14px;font-size:14px}.exercise-fields{display:grid;gap:18px;margin-top:22px}.exercise-field label,.book-exercise>label{display:block;font-size:14px;font-weight:500;margin-bottom:7px}.exercise-field input,.exercise-field select{width:100%;min-height:44px;border:1px solid #bdcbb6;border-radius:6px;background:var(--paper);color:var(--ink);padding:9px 12px;font-size:16px}.exercise-actions{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 25px;align-items:center}.exercise-actions button{min-height:44px}.field-feedback,.field-answer{font-size:14px;padding:12px;border-radius:6px;margin:8px 0 0;line-height:1.6}.field-feedback.correct{background:var(--mint)}.field-feedback.incorrect{background:#fff1e9}.field-answer{background:#f5f6f0}.exercise-reset{min-height:44px;margin-top:14px}.self-check{border:1px solid var(--line);border-radius:7px;padding:12px;margin:20px 0}.self-check legend{font-size:14px}.self-check label{display:flex;align-items:center;gap:10px;min-height:44px;font-size:14px}.self-check input{width:20px;height:20px;flex-shrink:0;accent-color:var(--green)}.listening-transcript{border:1px solid var(--line);border-radius:7px;padding:14px;margin:22px 0}.listening-transcript summary{font-size:14px;min-height:44px;cursor:pointer;padding:8px 0}.listening-transcript .secondary{min-height:44px;font-size:13px}.transcript-group h4{font-size:13px;color:var(--orange);margin:20px 0 10px}.transcript-line{padding:8px 0;border-bottom:1px solid var(--line)}.transcript-line p{font-size:15px;margin:0;overflow-wrap:anywhere}.transcript-line .translation{font-size:14px;color:var(--muted);margin-top:6px}.section-pick span{font-size:11px;white-space:nowrap}.book-exercise .fine{font-size:12px!important}@media(max-width:1000px){.help-tabs button{padding:10px 3px;font-size:13px}.exercise-field label{font-size:15px}.exercise-actions .primary,.exercise-actions .secondary{font-size:14px}.book-exercise .fine{font-size:13px!important}}.exercise-photos{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}.exercise-photos figure{margin:0;min-width:0;align-self:center}.exercise-photos svg{display:block;width:100%;height:auto;border-radius:6px;border:1px solid var(--line);background:var(--paper)}.exercise-photos figcaption{font-size:13px;text-align:center;margin-top:5px}