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sans-serif;--max-content:900px;--toc-width:280px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;font-size:16px}body{font-family:var(--font-body);color:var(--color-text);background:var(--color-bg);min-height:100vh;line-height:1.6}.app{min-height:100vh;display:flex;position:relative}.slide-container{min-height:100vh;margin-left:var(--toc-width);flex-direction:column;flex:1;transition:margin-left .3s;display:flex}.slide-header{z-index:10;background:var(--color-card);border-bottom:1px solid var(--color-border);padding:12px 168px 0 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#0000004d}.reveal-hotspot--active:after{border-color:var(--color-primary-dark);animation:none}.reveal-hotspot--visited{background:var(--color-primary-dark)}.reveal-hotspot--visited:after{border-color:#0000;animation:none}.reveal-hotspot-num{pointer-events:none;font-size:.75rem;font-weight:700;line-height:1}@keyframes hotspotPulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(1.3)}}.click-to-reveal--visual .reveal-items-col{flex-direction:column;gap:10px;display:flex}.click-to-reveal--visual .reveal-item{text-align:left;flex-direction:row;justify-content:flex-start;gap:12px;min-height:0;padding:14px 18px}.click-to-reveal--visual .reveal-item-badge{background:var(--color-primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:28px;min-width:28px;height:28px;font-size:.8rem;font-weight:700;display:flex}.click-to-reveal--visual .reveal-item--visited .reveal-item-badge{background:var(--color-primary-dark)}.click-to-reveal--visual .reveal-panel{grid-column:1/-1}@media (width<=600px){.click-to-reveal--visual .reveal-layout{grid-template-columns:1fr}.click-to-reveal--visual .reveal-image img{max-width:220px}}.quiz-card{background:var(--color-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);max-width:var(--max-content);width:100%;padding:40px}.quiz-question{color:var(--color-text);margin-bottom:8px;font-size:1.3rem;font-weight:600}.quiz-hint{color:var(--color-text-light);margin-bottom:20px;font-size:.85rem;font-style:italic}.quiz-answers{flex-direction:column;gap:10px;margin:20px 0;display:flex}.quiz-option{border:2px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;align-items:flex-start;gap:12px;padding:14px 18px;transition:border-color .2s,background .2s;display:flex}.quiz-option:hover{border-color:var(--color-primary-light);background:#f8faf8}.quiz-option input{accent-color:var(--color-primary);flex:none;margin-top:3px}.quiz-option:focus-within{outline:2px solid 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strong+div{margin-top:6px;font-weight:400}.quiz-intro{color:var(--color-text-light);margin-bottom:20px;line-height:1.6}.quiz-actions{flex-wrap:wrap;gap:12px;margin-top:20px;display:flex}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.drag-drop{margin:24px 0}.drag-drop-instruction{margin-bottom:18px;font-weight:500}.drag-drop-stage{margin-bottom:24px;position:relative}.drag-drop-stage--backdrop{max-width:560px;margin-inline:auto}.drag-drop-backdrop{-webkit-user-select:none;user-select:none;-webkit-user-drag:none;width:100%;height:auto;display:block}.drag-drop-slots{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.drag-drop-stage--backdrop .drag-drop-slots{flex-wrap:nowrap;gap:8px;position:absolute;top:11%;left:29%;right:19%}.drag-drop-slot{min-width:96px;min-height:96px;font:inherit;color:var(--color-text);border:2px dashed 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var(--color-primary);outline-offset:2px}.drag-drop-slot--filled{border-style:solid;border-color:var(--color-border);background:var(--color-card);box-shadow:var(--shadow-sm)}.drag-drop-slot--correct{border-style:solid;border-color:var(--color-correct);background:#e8f5e9}.drag-drop-slot--wrong{border-style:solid;border-color:var(--color-incorrect);background:#ffebee}.drag-drop-slot:disabled{cursor:default}.drag-drop-slot-placeholder{color:var(--color-primary);opacity:.75;font-size:1.4rem;font-weight:600}.drag-drop-tray{background:var(--color-bg);border-radius:var(--radius-md);flex-wrap:wrap;justify-content:center;gap:12px;min-height:116px;padding:16px;display:flex}.drag-drop-tray--empty{background:0 0;min-height:0;padding:0}.drag-drop-tile{width:108px;font:inherit;color:var(--color-text);background:var(--color-card);border:2px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);cursor:grab;flex-direction:column;align-items:center;gap:8px;padding:12px 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.drag-drop-slots{flex-wrap:wrap;margin-top:16px;position:static}.drag-drop-stage--backdrop .drag-drop-slot{aspect-ratio:auto;min-height:96px}.drag-drop-stage--backdrop .drag-drop-tile-icon{width:44px;height:44px}.drag-drop-tile{width:96px}}.result-card{background:var(--color-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);max-width:var(--max-content);text-align:center;width:100%;padding:48px 40px}.result-title{margin-bottom:32px;font-size:1.5rem}.result-score{margin-bottom:24px}.result-percentage{font-size:4rem;font-weight:700;line-height:1.1;display:block}.result-passed{color:var(--color-correct)}.result-failed{color:var(--color-incorrect)}.result-detail{color:var(--color-text-light);margin-top:8px;font-size:1.1rem;display:block}.result-status{border-radius:var(--radius-md);margin-bottom:24px;padding:16px 24px;font-weight:500}.result-status--passed{color:#2e7d32;background:#e8f5e9}.result-status--failed{color:#c62828;background:#ffebee}.result-retry-info,.result-attempt,.result-no-retry,.result-info{color:var(--color-text-light);margin-bottom:16px}.btn{border-radius:var(--radius-sm);cursor:pointer;border:none;padding:12px 28px;font-size:1rem;font-weight:500;transition:background .2s,transform .1s;display:inline-block}.btn:active{transform:scale(.98)}.btn-submit,.btn-check,.btn-retry{background:var(--color-primary);color:#fff}.btn-submit:hover,.btn-check:hover,.btn-retry:hover{background:var(--color-primary-dark)}.btn-reset{color:var(--color-text-light);border:1px solid var(--color-border);background:0 0}.btn-reset:hover:not(:disabled){border-color:var(--color-text-light);color:var(--color-text)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.slide-footer{border-top:1px solid var(--color-border);background:var(--color-card);justify-content:space-between;padding:16px 24px;display:flex}.nav-btn{background:var(--color-primary);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;padding:10px 24px;font-size:.95rem;font-weight:500;transition:background .2s}.nav-btn:hover:not(:disabled){background:var(--color-primary-dark)}.nav-btn:disabled{background:var(--color-border);color:#999;cursor:not-allowed}.language-switcher{z-index:30;position:fixed;top:8px;right:16px}.language-switcher select{border:1px solid var(--color-border);border-radius:var(--radius-sm);background-color:var(--color-card);width:140px;min-width:112px;height:36px;color:var(--color-text);font:inherit;box-shadow:var(--shadow-sm);cursor:pointer;padding:0 32px 0 12px;font-size:.9rem}.language-switcher select:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.language-switcher select:disabled{cursor:wait;opacity:.7}.toc-sidebar{width:var(--toc-width);background:var(--color-card);border-right:1px solid var(--color-border);z-index:20;padding:20px 0;transition:transform .3s;position:fixed;top:0;bottom:0;left:0;overflow-y:auto}.toc-title{color:var(--color-primary-dark);border-bottom:1px solid var(--color-border);margin-bottom:8px;padding:0 20px 16px;font-size:1.1rem;font-weight:700}.toc-toggle{z-index:25;background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;width:40px;height:40px;box-shadow:var(--shadow-sm);justify-content:center;align-items:center;font-size:1.4rem;display:none;position:fixed;top:12px;left:12px}.toc-section{margin-bottom:4px}.toc-module{text-align:left;width:100%;color:var(--color-text);cursor:pointer;background:0 0;border:none;padding:10px 20px;font-size:.9rem;font-weight:600;transition:background .15s;display:block}.toc-module:hover{background:#f0f2f5}.toc-module--active{color:var(--color-primary-dark);border-left:3px solid var(--color-primary);background:#f0f8ef}.toc-module--completed:after{content:" ✓";color:var(--color-correct)}.toc-slides{padding:0;list-style:none}.toc-slide{text-align:left;width:100%;color:var(--color-text-light);cursor:pointer;white-space:nowrap;text-overflow:ellipsis;background:0 0;border:none;padding:6px 20px 6px 36px;font-size:.82rem;transition:background .15s;display:block;overflow:hidden}.toc-slide:hover{background:#f0f2f5}.toc-slide--active{color:var(--color-primary-dark);background:#f0f8ef;font-weight:600}.toc-slide--visited{color:var(--color-text)}.toc-overlay{z-index:15;background:#0006;display:none;position:fixed;inset:0}@media (width<=768px){.slide-header{padding-left:60px;padding-right:164px}.language-switcher{right:12px}.language-switcher select{min-width:104px}.toc-sidebar{transform:translate(-100%)}.toc-toggle{display:flex}.slide-container{margin-left:0}.toc-open .toc-sidebar{transform:translate(0)}.toc-open .toc-overlay{display:block}.content-card,.quiz-card,.result-card{border-radius:var(--radius-md);padding:24px 16px}.slide-content{padding:16px 12px}h1.content-heading{font-size:1.4rem}}