:root,[data-theme=light]{--content-max: 1400px;--study-core-ring: #6d28d9;--study-problems-ring: #01696f;--study-revision-ring: #b45309;--bg: #f7f6f2;--surface: #f9f8f5;--surface2: #fbfbf9;--offset: #f3f0ec;--divider: #dcd9d5;--border: #d4d1ca;--text: #28251d;--muted: #5c5a55;--faint: #9e9c97;--inv: #f9f8f4;--primary: #01696f;--primary-h: #0c4e54;--error: #a12c7b;--warn: #964219;--shadow: 0 4px 16px rgba(40, 37, 29, .09);--radius: .5rem;--guide-method-edge: #5b21b6;--guide-method-mid: #7c3aed;--guide-method-glow: rgba(91, 33, 182, .2);--guide-method-hint: #b45309}@media(min-width:1536px){:root,[data-theme=light],[data-theme=dark]{--content-max: min(1720px, calc(100vw - 300px) )}}@media(min-width:1920px){:root,[data-theme=light],[data-theme=dark]{--content-max: min(2000px, calc(100vw - 320px) )}}@media(min-width:2560px){:root,[data-theme=light],[data-theme=dark]{--content-max: min(2400px, calc(100vw - 340px) )}}[data-theme=dark]{--study-core-ring: #a78bfa;--study-problems-ring: 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var(--divider);display:flex;align-items:center;gap:.6rem}.logo-copy{min-width:0;flex:1}.sidebar-collapse-btn{display:none}@media(min-width:1025px){.sidebar-collapse-btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;flex-shrink:0;margin-left:auto;min-height:2.2rem;padding:.4rem 1.05rem .4rem .75rem;border-radius:999px;font-size:.72rem;font-weight:500;letter-spacing:.006em;color:color-mix(in oklab,var(--muted) 78%,var(--text));background:color-mix(in oklab,var(--offset) 38%,var(--surface));border:1px solid color-mix(in oklab,var(--divider) 55%,transparent);box-shadow:none;transition:background .28s ease,color .28s ease,border-color .28s ease,box-shadow .28s ease,transform .22s ease}.sidebar-collapse-btn svg{flex-shrink:0;opacity:.72;transition:opacity .28s ease,transform .28s ease}.sidebar-collapse-btn:hover{color:color-mix(in oklab,var(--primary) 72%,var(--text));border-color:color-mix(in oklab,var(--primary) 22%,var(--divider));background:color-mix(in 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.8rem;border-radius:.4rem;margin:1px .4rem;cursor:pointer;font-size:.8rem;transition:background .15s,color .15s;color:var(--muted);border:none;background:none;width:calc(100% - .8rem);text-align:left}.nav-item:hover{background:var(--offset);color:var(--text)}.nav-item.active{background:color-mix(in oklab,var(--primary) 12%,var(--surface));color:var(--primary);font-weight:600;box-shadow:inset 3px 0 0 0 var(--primary)}.nav-item .num{font-size:.68rem;font-weight:700;min-width:1.4rem;color:var(--faint)}.nav-item.active .num{color:var(--primary)}.nav-item .tier-dot{font-size:.6rem;font-weight:600;font-variant-numeric:tabular-nums;color:var(--faint);flex-shrink:0;margin-left:auto;line-height:1;white-space:nowrap;transition:color .3s;letter-spacing:.01em}.sidebar-footer{margin-top:auto;padding:.8rem;border-top:1px solid 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85%,#e53e3e)}.w98-switch{display:inline-flex;align-items:center;gap:.4rem;height:36px;padding:0 .6rem;border-radius:.45rem;background:var(--offset);border:1px solid var(--border);cursor:pointer;user-select:none;transition:background .15s,border-color .15s}.w98-switch:hover{background:var(--surface2);border-color:var(--primary)}.w98-switch input{position:absolute;opacity:0;pointer-events:none;width:0;height:0}.w98-slider{position:relative;width:28px;height:14px;background:var(--divider);border-radius:999px;transition:background .15s;flex-shrink:0}.w98-slider:before{content:"";position:absolute;top:1px;left:1px;width:12px;height:12px;background:#fff;border-radius:50%;box-shadow:0 1px 2px #00000040;transition:transform .18s ease}.w98-switch input:checked~.w98-slider{background:var(--primary)}.w98-switch input:checked~.w98-slider:before{transform:translate(14px)}.w98-label{font-size:.72rem;font-weight:700;letter-spacing:.02em;color:var(--muted);transition:color .15s}.w98-switch 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ease-out,color .15s ease-out,opacity .15s ease-out;user-select:none;animation:viz-cell-pop-in .5s cubic-bezier(.33,1.15,.55,1) backwards}@media(prefers-reduced-motion:reduce){.viz-cell{animation:none!important}}.viz-n{background:var(--offset);border-color:var(--border)}.viz-l{background:#dbeafe;border-color:#3b82f6;color:#1e40af}.viz-r{background:#ffedd5;border-color:#f97316;color:#9a3412}.viz-m{background:#f3e8ff;border-color:#a855f7;color:#6b21a8}.viz-w{background:color-mix(in oklab,var(--primary) 15%,var(--surface));border-color:var(--primary);color:var(--primary)}.viz-ok{background:#dcfce7;border-color:#22c55e;color:#166534}.viz-x{opacity:.22}[data-theme=dark] .viz-l{background:#3b82f633;border-color:#60a5fa;color:#93c5fd}[data-theme=dark] .viz-r{background:#f973162e;border-color:#fb923c;color:#fdba74}[data-theme=dark] .viz-m{background:#a855f72e;border-color:#c084fc;color:#d8b4fe}[data-theme=dark] 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