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12px;font-family:var(--font-ui);font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}.topic-card{display:grid;gap:6px;padding:16px 14px;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--ink);text-align:left;transition:border-color .16s var(--ease-out),background-color .16s var(--ease-out)}.topic-card:hover,.topic-card:active{border-color:var(--blue-hover-line);background:var(--blue-hover-soft)}.topic-card.selected{border-color:var(--blue);background:var(--blue-soft)}.topic-card-icon{font-family:var(--font-display);font-size:22px;line-height:1;color:var(--accent)}.topic-card-label{font-family:var(--font-ui);font-size:1rem;font-weight:700}.topic-card-desc{font-family:var(--font-body);font-size:.9375rem;color:var(--muted);font-weight:400;line-height:1.45}.diff-row{display:flex;flex-wrap:wrap;gap:8px}.diff-chip{min-height:48px;padding:10px 20px;border:1px solid var(--line);border-radius:999px;background:var(--panel);color:var(--ink);font-family:var(--font-ui);font-size:.875rem;font-weight:700;letter-spacing:.01em;transition:border-color .16s var(--ease-out),background-color .16s var(--ease-out)}.diff-chip:hover,.diff-chip:active{border-color:var(--blue-hover-line)}.diff-chip.selected{border-color:var(--blue);background:var(--blue-soft);color:var(--ink)}.landing-start{width:100%;max-width:360px;margin-top:8px}.landing-references{margin-top:36px;padding-top:24px;border-top:1px solid var(--line)}.reference-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}.reference-card{padding:14px 16px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.reference-title{margin:0 0 4px;font-family:var(--font-ui);font-size:.95rem;font-weight:700}.reference-meta{margin:0 0 10px;font-family:var(--font-body);font-size:.8125rem;color:var(--muted);line-height:1.4}.reference-links{display:flex;flex-wrap:wrap;gap:8px}.reference-link,a.question-source{color:var(--blue);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .16s var(--ease-out)}.reference-link:hover,a.question-source:hover{border-bottom-color:currentColor}.workspace{width:100%;margin:0 auto;padding:6px 8px 20px}.content-grid{display:grid;grid-template-columns:minmax(420px,1.45fr) minmax(320px,.9fr);align-items:start;gap:10px}.visual-panel,.problem-panel{min-width:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}.visual-panel{position:sticky;top:calc(44px + env(safe-area-inset-top,0px));display:flex;flex-direction:column;height:calc(100dvh - 52px - env(safe-area-inset-top,0px));max-height:calc(100dvh - 52px - env(safe-area-inset-top,0px));overflow:hidden;box-shadow:0 1px color-mix(in srgb,var(--ink) 4%,transparent)}.visual-head{flex:0 0 auto;padding:6px 10px;background:var(--panel);border-bottom:1px solid color-mix(in srgb,var(--line) 85%,transparent)}.visual-head-row{display:flex;align-items:center;gap:10px;min-width:0}.visual-head.compact h2{margin:0;flex:0 1 auto;min-width:0;max-width:42%;font-family:var(--font-ui);font-size:.875rem;font-weight:700;color:var(--ink);letter-spacing:.01em;line-height:1.3;text-transform:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.visual-camera-hint{flex:0 0 auto;display:grid;place-items:center;width:32px;height:32px;margin:0 0 0 auto;padding:0;border:1px solid var(--line);border-radius:50%;background:var(--elevated);color:var(--muted);font-family:var(--font-ui);font-size:.875rem;font-weight:700;line-height:1;cursor:help}.visual-camera-hint:hover,.visual-camera-hint:active{border-color:var(--secondary-hover-line);color:var(--ink)}.step-track{display:flex;flex-wrap:nowrap;flex:1 1 auto;gap:4px;margin:0;padding:0;list-style:none;min-width:0;overflow-x:auto;scrollbar-width:none}.step-track::-webkit-scrollbar{display:none}.step-item-wrap{margin:0;padding:0;flex:0 0 auto}.step-item{min-height:28px;padding:3px 9px;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--muted);font-family:var(--font-ui);font-size:.6875rem;font-weight:700;cursor:pointer;transition:border-color .16s var(--ease-out),background-color .16s var(--ease-out),color .16s var(--ease-out)}.step-item:hover{border-color:var(--blue-hover-line);color:var(--ink)}.step-item.active{border-color:var(--blue);background:var(--blue-soft);color:var(--ink)}.step-detail{margin:4px 0 0;color:var(--muted);font-family:var(--font-ui);font-size:.75rem;font-weight:500;line-height:1.35;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#three-host,.viz-host{position:relative;flex:1 1 auto;min-height:0;height:auto;background:radial-gradient(120% 90% at 50% 42%,color-mix(in srgb,var(--media-canvas) 92%,#fff) 0%,var(--media-canvas) 55%,color-mix(in srgb,var(--media-canvas) 88%,var(--ink)) 100%);isolation:isolate}.viz-host.is-loading .legacy-animation,.viz-host.has-error .legacy-animation{opacity:0;pointer-events:none}.viz-loading{position:absolute;inset:0;z-index:1;display:grid;place-content:center;gap:12px;padding:24px;background:var(--media-canvas)}.viz-loading.hidden,.viz-host:not(.is-loading) .viz-loading{display:none}.viz-error{position:absolute;inset:0;z-index:2;display:grid;place-content:center;justify-items:center;gap:14px;padding:24px;background:var(--media-canvas);text-align:center}.viz-error[hidden]{display:none!important}.viz-error-text{margin:0;max-width:28ch;color:var(--ink);font-family:var(--font-ui);font-size:.875rem;font-weight:600;line-height:1.45}.viz-loading-bar{display:block;width:min(240px,70%);height:6px;margin:0 auto;border-radius:999px;background:var(--progress-track);overflow:hidden;position:relative}.viz-loading-bar:after{content:"";position:absolute;inset:0;width:40%;border-radius:inherit;background:var(--blue);animation:viz-load-slide 1.1s var(--ease-out) infinite}@keyframes viz-load-slide{0%{transform:translate(-120%)}to{transform:translate(320%)}}.viz-loading-text{color:var(--muted);font-family:var(--font-ui);font-size:.8125rem;font-weight:600;text-align:center}.legacy-animation{display:block;width:100%;height:100%;border:0;background:transparent;transition:opacity .2s var(--ease-out);cursor:grab;touch-action:none}.legacy-animation:active{cursor:grabbing}.segmented{display:flex;padding:3px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.segmented button{min-height:44px;border:0;border-radius:6px;background:transparent;color:var(--muted);padding:6px 14px;font-family:var(--font-ui);font-size:.875rem;font-weight:700}.segmented button.selected{background:var(--blue-soft);color:var(--ink)}.text-button{min-height:40px;border:0;background:transparent;color:var(--blue);padding:4px 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.choice-status{color:var(--red)}.choice:hover:not(:disabled){border-color:var(--blue-hover-line);background:var(--blue-hover-soft)}.choice:active:not(:disabled){transform:translateY(1px)}.choice.selected{border-color:var(--blue);background:var(--blue-soft)}.choice.correct{border-color:var(--teal);background:var(--teal-soft)}.choice.incorrect{border-color:var(--red);background:var(--red-soft)}.choice:disabled{color:var(--ink);cursor:default}.choice-letter{display:grid;flex:0 0 30px;place-items:center;width:30px;height:30px;border:1px solid currentColor;border-radius:50%;color:var(--muted);font-family:var(--font-ui);font-size:.875rem;font-weight:700}.choice-math{min-width:0;overflow-x:auto;line-height:1.35}.choice-math .katex{font-size:1.3em}.choice-long .choice-math{overflow-x:visible;white-space:normal}.choice-long .choice-math .katex{font-size:1.05em}.choice-long .choice-math .katex-display{margin:0;text-align:left}.selected .choice-letter{color:var(--blue)}.correct .choice-letter{color:var(--teal)}.incorrect .choice-letter{color:var(--red)}.question-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:14px}.primary,.secondary{min-height:44px;border-radius:8px;padding:10px 18px;font-family:var(--font-ui);font-size:1rem;font-weight:700;letter-spacing:.01em;transition:background-color .16s var(--ease-out),border-color .16s var(--ease-out),transform .16s var(--ease-out)}.primary{border:1px solid var(--blue);background:var(--blue);color:var(--on-primary)}.primary:hover:not(:disabled){background:var(--blue-hover)}.primary:active:not(:disabled),.secondary:active:not(:disabled){transform:translateY(1px)}.primary:disabled{border-color:var(--disabled);background:var(--disabled);cursor:not-allowed}.secondary{border:1px solid var(--line);background:var(--panel);color:var(--ink)}.secondary:hover:not(:disabled){border-color:var(--secondary-hover-line);background:var(--surface-hover)}.secondary:disabled{color:var(--muted);opacity:.62;cursor:not-allowed}.feedback{margin-top:14px;padding:12px 14px;border-radius:8px;font-family:var(--font-body);font-size:1rem;line-height:1.7;color:var(--ink)}.feedback.positive{background:var(--teal-soft)}.feedback.negative{background:var(--red-soft)}.feedback-message{margin:0}.feedback.positive .feedback-message strong{color:var(--teal)}.feedback.negative .feedback-message strong{color:var(--red)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.problem-navigator{position:sticky;bottom:0;z-index:var(--z-sticky);display:flex;flex-direction:column;gap:6px;margin-top:10px;padding:6px 8px max(7px,env(safe-area-inset-bottom,0px));border:1px solid var(--line);border-radius:10px;background:color-mix(in srgb,var(--panel) 96%,transparent);box-shadow:0 -4px 12px color-mix(in srgb,var(--ink) 5%,transparent)}.problem-nav-toolbar{display:flex;align-items:center;gap:6px;min-width:0}.problem-nav-step{flex:0 0 auto;min-height:30px;min-width:30px;padding:0 8px;font-size:.875rem;line-height:1}.problem-jump{display:flex;align-items:center;gap:4px;flex:0 0 auto;margin:0}.problem-jump-input{width:2.75rem;min-height:30px;padding:2px 6px;border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--ink);font-family:var(--font-ui);font-size:1rem;font-weight:700;text-align:center;appearance:textfield;-moz-appearance:textfield}.problem-jump-input::-webkit-outer-spin-button,.problem-jump-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.problem-jump-input:hover{border-color:var(--secondary-hover-line)}.problem-jump-go{min-height:30px;padding:0 8px;font-size:.75rem}.problem-nav-position{margin:0;flex:0 0 auto;font-family:var(--font-ui);font-size:.75rem;font-weight:700;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}.problem-nav-current{color:var(--blue);font-size:.8125rem}.problem-bands{display:flex;flex:1 1 auto;min-width:0;gap:0;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:var(--elevated)}.problem-band{flex:1 1 0;min-width:0;min-height:28px;padding:3px 4px;border:0;border-right:1px solid var(--line);border-radius:0;background:transparent;color:var(--muted);font-family:var(--font-ui);font-size:.6875rem;font-weight:700;letter-spacing:0;line-height:1.1;transition:background-color .14s var(--ease-out),color .14s var(--ease-out)}.problem-band:last-child{border-right:0}.problem-band:hover{background:var(--surface-hover);color:var(--ink)}.problem-band.active{background:var(--blue-soft);color:var(--blue);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--blue) 35%,transparent)}.problem-band.has-progress:not(.active){color:var(--ink)}.problem-pills{display:flex;justify-content:center;flex-wrap:nowrap;gap:4px;min-width:0;overflow-x:auto;padding:0;scrollbar-width:thin}.problem-pill{position:relative;display:grid;place-items:center;flex:0 0 auto;width:28px;height:28px;border:1px solid var(--line);border-radius:50%;background:var(--panel);color:var(--muted);font-family:var(--font-ui);font-size:.7rem;font-weight:700}.problem-pill-num{line-height:1}.problem-pill-icon{position:absolute;right:-2px;bottom:-2px;display:grid;place-items:center;width:12px;height:12px;border-radius:50%;border:1px solid var(--panel);font-size:.5rem;font-weight:700;line-height:1;color:var(--on-primary)}.problem-pill.correct .problem-pill-icon{background:var(--teal);border-color:var(--panel)}.problem-pill.incorrect .problem-pill-icon{background:var(--red);border-color:var(--panel)}.problem-pill:hover,.problem-pill.active{border-color:var(--blue);background:var(--blue-soft);color:var(--blue)}.problem-pill.correct{border-color:var(--teal);background:var(--teal-soft);color:var(--teal)}.problem-pill.incorrect{border-color:var(--red);background:var(--red-soft);color:var(--red)}.problem-pill.active{box-shadow:0 0 0 2px color-mix(in srgb,var(--blue) 22%,transparent)}@media(prefers-reduced-motion:reduce){.problem-band,.problem-nav-step,.problem-jump-go{transition:none}}.solution-panel{margin:20px -22px -22px;padding:0;overflow:hidden;border-top:1px solid var(--line);scroll-margin-top:72px}.solution-panel.is-open{border-top-color:color-mix(in srgb,var(--blue) 35%,var(--line))}.solution-banner{padding:18px 20px 16px;border-bottom:1px solid var(--line)}.solution-banner.is-correct{background:linear-gradient(180deg,var(--teal-soft) 0%,var(--panel) 100%)}.solution-banner.is-incorrect{background:linear-gradient(180deg,var(--blue-soft) 0%,var(--panel) 100%)}.solution-banner h2{margin:0;font-family:var(--font-display);font-size:2rem;font-weight:600;letter-spacing:-.01em;line-height:1.2}.solution-equations{margin:0 16px 4px;padding:14px 16px 12px;border-radius:10px;border:1px solid color-mix(in srgb,var(--accent) 40%,var(--line));background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 12%,var(--panel)) 0%,var(--panel) 100%)}.solution-equations-label{margin:0 0 10px;font-family:var(--font-ui);font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:color-mix(in srgb,var(--accent) 70%,var(--ink))}.solution-equations-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}.solution-equation-item{margin:0}.solution-equation-math{overflow-x:auto;overflow-y:hidden;padding:10px 12px;border-radius:8px;background:var(--canvas);border:1px solid var(--line);color:var(--ink)}.solution-equation-math .katex-display{margin:0;text-align:left}.solution-equation-math .katex{font-size:1.28em}.solution-steps{list-style:none;margin:0;padding:8px 0}.solution-step{display:grid;grid-template-columns:44px minmax(0,1fr);gap:14px 16px;padding:16px 22px;border-bottom:1px solid color-mix(in srgb,var(--line) 80%,transparent)}.solution-step:last-child{border-bottom:0}.solution-step-marker{display:grid;place-items:center;width:40px;height:40px;margin-top:2px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-family:var(--font-ui);font-size:.875rem;font-weight:700;font-variant-numeric:tabular-nums}.solution-step-title{margin:0 0 8px;font-family:var(--font-display);font-size:1.375rem;font-weight:600;letter-spacing:-.01em;line-height:1.3;text-wrap:balance}.solution-step-text{color:var(--ink);font-family:var(--font-body);font-size:1rem;line-height:1.75;max-width:72ch;text-wrap:pretty}.solution-step-text .katex-display{margin:10px 0;overflow-x:auto;overflow-y:hidden;padding:10px 12px;border-radius:8px;background:var(--canvas);border:1px solid var(--line);text-align:left}.solution-step-text .katex{font-size:1.3em}.solution-answer{margin:0 16px 16px;padding:16px 18px;border-radius:10px;border:1px solid color-mix(in srgb,var(--blue) 28%,var(--line));background:var(--blue-soft)}.solution-answer-label{margin:0 0 8px;font-family:var(--font-ui);font-size:.75rem;font-weight:700;color:var(--blue);letter-spacing:.1em;text-transform:uppercase}.solution-answer-math{overflow-x:auto;color:var(--ink)}.solution-answer-math .katex-display{margin:0;text-align:left}.solution-answer-math .katex{font-size:1.4em}.solution-insight{margin:0 16px 18px;padding:14px 16px;border-radius:10px;background:var(--canvas);border:1px solid var(--line)}.solution-insight-label{margin:0 0 4px;font-family:var(--font-ui);font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.solution-insight-text{margin:0;font-family:var(--font-body);font-size:.9375rem;line-height:1.7;color:var(--ink);max-width:70ch;text-wrap:pretty}.solution-method-title{margin:18px 16px 8px;font-family:var(--font-ui);font-size:.8125rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.solution-method-block{margin-top:8px;padding-top:8px;border-top:1px solid var(--line)}.solution-method-note{margin:0 16px 10px;font-family:var(--font-body);font-size:.875rem;line-height:1.5;color:var(--muted)}.slice-hint{margin-top:4px}@media(max-width:1100px){.content-grid{grid-template-columns:minmax(360px,1.25fr) 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