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10px}.intro-copy .eyebrow{font-size:9px}.speaker{margin:14px 0 9px}.story-text{font-size:17px;line-height:1.95}.intro-pagination{margin:20px 0 17px}.intro-copy .primary{width:100%}.small-note{font-size:10px;margin-top:15px}.explore-layout{display:flex;flex-direction:column;gap:24px}.explore-visual{width:100%}.scene-tabs{gap:23px;margin-bottom:12px}.scene-tab{font-size:12px;padding-top:4px;padding-bottom:9px;min-height:43px}.scene-tab small{font-size:10px}.scene-frame img{aspect-ratio:3/2}.scene-caption{font-size:10px;padding:9px 0}.scene-label{top:11px;left:12px;font-size:9px}.hotspot{width:40px;height:40px;font-size:15px;box-shadow:0 0 0 4px #fff8df32}.hotspot:before{content:"";position:absolute;inset:-3px;border-radius:50%}.observation-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:5px}.observation-link{font-size:10px;padding:7px 6px;gap:5px;min-height:49px}.observation-link .index{font-size:11px}.scene-context{font-size:13px;line-height:1.9;margin-top:15px;padding-left:12px}.notebook{width:100%;min-height:0;padding:19px 21px 22px}.note-row{padding:9px 0}.notebook-title{font-size:18px}.notebook-subtitle{font-size:10px}.note-summary{font-size:11px}.notebook .primary,.notebook .secondary{font-size:13px;min-height:48px}.report-status{font-size:11px;margin-top:2px}.page-footer{padding:20px 20px 25px;font-size:9px;align-items:flex-start}.page-footer span{max-width:240px}.reveal-page{padding-top:30px}.reveal-heading h1{font-size:29px;margin:9px 0}.reveal-heading p{font-size:14px}.date-comparison{grid-template-columns:1fr 19px 1fr;gap:0;margin:25px 0}.date-sheet{padding:15px 12px;min-height:215px}.sheet-heading{font-size:9px;letter-spacing:.03em}.sheet-date{font-size:23px;padding:9px 0}.sheet-line{font-size:10px;gap:6px;line-height:1.6;padding:8px 0}.sheet-line .icon{width:12px;height:12px}.date-arrow{font-size:15px}.reveal-body p{font-size:16px;line-height:2;margin:16px 0}.reveal-body .primary{width:100%}.report-layout{grid-template-columns:1fr;gap:30px}.report-facts h2,.report-preview h2{font-size:20px}.fact-option{font-size:13px;padding:12px 0}.fact-option small{font-size:12px}.report-preview{padding:21px 20px}.report-preview .body{font-size:16px}.report-preview .primary{font-size:12px;padding:12px 10px}.risky-choice{font-size:11px}.ending-hero{min-height:230px}.ending-hero img{height:240px;object-position:center}.ending-art-tag{left:17px;bottom:17px;font-size:11px}.ending-copy{padding:25px 2px 10px}.ending-copy h1{font-size:28px;margin-bottom:13px}.ending-copy .eyebrow{font-size:9px}.ending-lead{font-size:17px}.ending-paragraphs{font-size:16px;line-height:2;margin:20px 0}.ending-quote{font-size:18px;padding-left:17px;margin:23px 0}.causality{padding:17px 0;margin:23px 0}.causality p{font-size:12px}.knowledge-grid{grid-template-columns:1fr;gap:3px;margin:15px 0}.knowledge-link{min-height:0;padding:13px 0}.knowledge-link b{font-size:17px;margin-bottom:5px}.knowledge-link span{font-size:12px}.ending-bottom{display:block;margin-top:20px}.ending-bottom .primary,.ending-bottom .secondary{width:100%;font-size:13px}.ending-bottom .button-row{width:100%}.ending-common{font-size:15px;line-height:2;margin-top:24px}.ending-count{text-align:center}.dialog-body{padding:29px 24px 26px}.dialog-body h2{font-size:25px;margin-bottom:14px}.dialog-prose{font-size:16px;line-height:1.95}.dialog-body .eyebrow{font-size:9px}.dialog-body .button-row>*{font-size:12px;padding:11px 12px}.dialog-body .teacher-note{font-size:16px}.fact-box{padding:12px 14px;font-size:12px;margin:16px 0}.feedback{font-size:12px;padding:13px 14px}.checklist-mini{padding:17px 20px}.checklist-mini .sheet-date{font-size:28px}.checklist-mini .sheet-line{font-size:12px}.about-lead{font-size:16px}.about-section p{font-size:12px}.primary,.secondary{min-height:49px}.toast{bottom:22px;font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Optional guide: independent of story progress. */
.cover-tutorial{display:flex;width:max-content;max-width:100%;font-size:12px;margin-top:8px;gap:8px;min-height:44px}
.tutorial-progress{display:flex;gap:10px;margin:0 0 18px}
.tutorial-progress span{display:grid;place-items:center;width:30px;height:30px;border:1px solid var(--line);border-radius:50%;font-size:10px;color:var(--muted)}
.tutorial-progress .active{background:var(--green);border-color:var(--green);color:var(--paper)}
.tutorial-demo{position:relative;background:#e7ecdf;border:1px solid #ccd5c3;padding:34px 23px 21px;margin:20px 0 18px;min-height:150px;color:var(--green)}
.tutorial-demo:before{content:"操作示意";position:absolute;top:10px;left:14px;font-size:9px;letter-spacing:.16em;color:var(--muted)}
.tutorial-scene{display:flex;align-items:center;justify-content:center;gap:17px;padding:4px 0 18px;font-size:12px}
.tutorial-marker{display:grid;place-items:center;width:43px;height:43px;border-radius:50%;border:1px solid var(--green);background:#f8f7e9;box-shadow:0 0 0 5px #f8f7e955;font-family:var(--serif);font-size:18px}
.tutorial-alternative{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid #cad3c2;padding-top:10px;font-size:12px}
.tutorial-note{display:grid;gap:6px;font-size:11px;border-left:2px solid #8da27e;padding-left:13px}
.tutorial-note strong{font-size:13px;font-weight:500}
.tutorial-report{margin-top:14px;display:flex;justify-content:space-between;border-top:1px solid #cad3c2;padding-top:10px;font-size:12px}
.tutorial-route{display:flex;align-items:center;justify-content:center;gap:12px;padding:12px 0}
.tutorial-route span{font-family:var(--serif);font-size:19px}.tutorial-route b{font-size:16px;font-weight:400;color:var(--gold)}
.tutorial-sample-note{font-size:10px;text-align:center;color:var(--muted);margin-top:8px}
.tutorial-text{font-family:var(--serif);font-size:17px;line-height:1.95}
.tutorial-tip{display:flex;align-items:flex-start;gap:8px;font-size:12px;line-height:1.9;color:var(--muted);margin-top:17px}
.tutorial-tip .icon{width:15px;height:15px;margin-top:4px}
.tutorial-exit{display:flex;width:100%;font-size:11px;margin-top:5px;min-height:44px}
@media(max-width:640px){.header-actions .header-tutorial{min-width:30px}.tutorial-demo{padding:31px 17px 18px;min-height:137px;margin:16px 0}.tutorial-progress{margin-bottom:15px}.tutorial-text{font-size:16px}.tutorial-tip{font-size:11px}.tutorial-controls .primary{min-width:0}.cover-tutorial{font-size:11px;margin-top:3px}}