:root{--bs-body-font-family: "Geist", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-sans: "Geist", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--font-xs: .75rem;--font-sm: .8125rem;--font-base: .875rem;--font-md: .9375rem;--font-lg: 1.125rem;--font-xl: 1.25rem;--font-2xl: 1.75rem;--font-3xl: 2.5rem;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--radius-xs: 3px;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 6px;--radius-xl: 8px;--radius-full: 9999px;--bs-border-radius: 6px;--bs-border-radius-sm: 4px;--bs-border-radius-lg: 6px;--bs-card-border-radius: 6px;--bs-primary: #b45309;--bs-primary-rgb: 180, 83, 9;--bs-primary-text-emphasis: #92400e;--bs-link-color: var(--bs-primary);--bs-link-hover-color: #92400e;--bs-btn-hover-bg: #92400e;--bs-focus-ring-color: rgba(180, 83, 9, .3);--difficulty-easy: #16a34a;--difficulty-medium: #ca8a04;--difficulty-hard: #dc2626;--visualizer-dot: rgba(15, 23, 42, .06);--card-border-tint: rgba(180, 83, 9, .14);--bg-canvas: #f8fafc;--bg-surface: #ffffff;--bg-subsurface: #f1f5f9;--bg-hover: #e2e8f0;--bg-active: #cbd5e1;--border-subtle: #e2e8f0;--border-strong: #cbd5e1;--border-focus: #b45309;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--text-inverse: #ffffff;--primary: #b45309;--primary-hover: #92400e;--primary-subtle: rgba(180, 83, 9, .08);--accent: #d97706;--accent-subtle: rgba(217, 119, 6, .1);--cat-array: #b45309;--cat-array-bg: #fef3c7;--cat-list: #059669;--cat-list-bg: #d1fae5;--cat-tree: #dc2626;--cat-tree-bg: #fee2e2;--cat-graph: #7c3aed;--cat-graph-bg: #ede9fe;--cat-hash: #0891b2;--cat-hash-bg: #cffafe;--cat-recur: #ea580c;--cat-recur-bg: #ffedd5;--cat-math: #475569;--cat-math-bg: #f1f5f9;--diff-easy: 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transparent;--btn-outline-primary-text: #b45309;--btn-outline-primary-border: #b45309;--btn-outline-primary-hover: rgba(180, 83, 9, .08);--shadow-subtle: 0 1px 2px rgba(0, 0, 0, .04);--shadow-card: 0 1px 3px rgba(0, 0, 0, .05), 0 1px 2px rgba(0, 0, 0, .02);--shadow-modal: 0 12px 28px rgba(0, 0, 0, .12), 0 4px 10px rgba(0, 0, 0, .06);--code-bg: #f8fafc;--code-text: #0f172a;--code-border: #e2e8f0;--code-active-line: rgba(217, 119, 6, .12);--code-highlight: #b45309;--bg-primary: var(--bg-canvas);--bg-secondary: var(--bg-surface);--bg-tertiary: var(--bg-subsurface);--border-color: var(--border-subtle)}[data-theme=light],[data-bs-theme=light]{--bs-primary: #b45309;--bs-primary-rgb: 180, 83, 9;--bs-primary-text-emphasis: #92400e;--bs-link-color: var(--bs-primary);--bs-link-hover-color: #92400e;--bs-btn-hover-bg: #92400e;--bs-focus-ring-color: rgba(180, 83, 9, .3);--difficulty-easy: #16a34a;--difficulty-medium: #ca8a04;--difficulty-hard: #dc2626;--visualizer-dot: rgba(15, 23, 42, .06);--card-border-tint: rgba(180, 83, 9, .14);--primary: #b45309;--primary-hover: #92400e;--primary-subtle: rgba(180, 83, 9, .08);--diff-easy: var(--difficulty-easy);--diff-medium: var(--difficulty-medium);--diff-hard: var(--difficulty-hard);--btn-primary-bg: #b45309;--btn-primary-text: #ffffff;--btn-primary-border: #b45309;--btn-primary-hover: #92400e;--btn-outline-primary-bg: transparent;--btn-outline-primary-text: #b45309;--btn-outline-primary-border: #b45309;--btn-outline-primary-hover: rgba(180, 83, 9, .08);--border-focus: #b45309}[data-theme=dark],[data-bs-theme=dark]{--bs-primary: #d97706;--bs-primary-rgb: 217, 119, 6;--bs-primary-text-emphasis: #fbbf24;--bs-link-color: var(--bs-primary);--bs-link-hover-color: #f59e0b;--bs-btn-hover-bg: #b45309;--bs-focus-ring-color: rgba(217, 119, 6, .35);--difficulty-easy: #22c55e;--difficulty-medium: #eab308;--difficulty-hard: #ef4444;--visualizer-dot: rgba(255, 255, 255, .05);--card-border-tint: rgba(217, 119, 6, .12);--bg-canvas: #090a0f;--bg-surface: #111318;--bg-subsurface: #181b22;--bg-hover: #212631;--bg-active: #2a313f;--border-subtle: #232834;--border-strong: #333a4d;--border-focus: #d97706;--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--text-inverse: #090a0f;--primary: #d97706;--primary-hover: #f59e0b;--primary-subtle: rgba(217, 119, 6, .15);--accent: #f59e0b;--accent-subtle: rgba(245, 158, 11, .12);--cat-array: #fbbf24;--cat-array-bg: rgba(251, 191, 36, .12);--cat-list: #34d399;--cat-list-bg: rgba(52, 211, 153, .12);--cat-tree: #f87171;--cat-tree-bg: rgba(248, 113, 113, .12);--cat-graph: #a78bfa;--cat-graph-bg: rgba(167, 139, 250, .12);--cat-hash: #22d3ee;--cat-hash-bg: rgba(34, 211, 238, .12);--cat-recur: #fb923c;--cat-recur-bg: rgba(251, 146, 60, .12);--cat-math: #94a3b8;--cat-math-bg: rgba(148, 163, 184, .12);--diff-easy: var(--difficulty-easy);--diff-easy-bg: rgba(34, 197, 94, .12);--diff-easy-border: rgba(34, 197, 94, .28);--diff-medium: var(--difficulty-medium);--diff-medium-bg: rgba(234, 179, 8, .12);--diff-medium-border: rgba(234, 179, 8, .28);--diff-hard: var(--difficulty-hard);--diff-hard-bg: rgba(239, 68, 68, .12);--diff-hard-border: rgba(239, 68, 68, .28);--success: #22c55e;--success-bg: rgba(34, 197, 94, .12);--success-border: rgba(34, 197, 94, .28);--danger: #ef4444;--danger-bg: rgba(239, 68, 68, .12);--danger-border: rgba(239, 68, 68, .28);--code-bg: #090a0f;--code-text: #e2e8f0;--code-border: #232834;--code-active-line: rgba(217, 119, 6, .18);--code-highlight: #fbbf24;--btn-primary-bg: #d97706;--btn-primary-text: #ffffff;--btn-primary-border: #d97706;--btn-primary-hover: #b45309;--btn-secondary-bg: #181b22;--btn-secondary-text: #f8fafc;--btn-secondary-border: #333a4d;--btn-secondary-hover: #212631;--btn-danger-bg: #dc2626;--btn-danger-text: #ffffff;--btn-danger-border: #ef4444;--btn-danger-hover: #b91c1c;--btn-warning-bg: #d97706;--btn-warning-text: #ffffff;--btn-warning-border: #f59e0b;--btn-warning-hover: 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4px;font-family:var(--font-mono);font-size:var(--font-sm);font-weight:600;min-height:40px;display:flex;align-items:center;justify-content:center;color:var(--text-primary)}.hash-bucket.highlight{border-color:var(--accent)}.hash-bucket.highlight .hash-index{background:var(--accent);color:#000}.hash-bucket.success{border-color:var(--success)}.hash-bucket.success .hash-index{background:var(--success);color:#fff}.hash-bucket.collision{border-color:var(--danger)}.hash-bucket.collision .hash-index{background:var(--danger);color:#fff}.tree-canvas{height:320px;border-radius:var(--bs-card-border-radius);border:1px solid var(--border-subtle);position:relative;overflow:hidden}@media (min-width: 768px){.tree-canvas{height:400px}}.tree-canvas svg{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1}.tree-line{stroke:var(--text-muted);stroke-width:2}.tree-line.highlight{stroke:var(--accent);stroke-width:3}.tree-node{position:absolute;width:36px;height:36px;background:var(--bg-surface);border:2px solid var(--border-strong);border-radius:50%;display:flex;justify-content:center;align-items:center;font-family:var(--font-mono);font-weight:600;font-size:var(--font-sm);transform:translate(-50%,-50%);z-index:2;color:var(--text-primary);box-shadow:var(--shadow-subtle)}.tree-node.highlight{border-color:var(--accent);background:var(--diff-medium-bg)}.tree-node.new-node{border-color:var(--success);background:var(--diff-easy-bg)}.traversal-output-bar{padding:8px 12px;background:var(--code-bg);border-radius:var(--bs-border-radius);color:var(--code-text);font-family:var(--font-mono);font-size:var(--font-xs);text-align:center;border:1px solid var(--border-strong);overflow-x:auto}.graph-canvas{height:320px;border-radius:var(--bs-card-border-radius);border:1px solid var(--border-subtle);position:relative;overflow:hidden;cursor:crosshair}@media (min-width: 768px){.graph-canvas{height:420px}}.graph-canvas svg{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1}.graph-line{stroke:var(--text-muted);stroke-width:2}.graph-line.highlight{stroke:var(--accent);stroke-width:3}.graph-node{position:absolute;width:36px;height:36px;background:var(--bg-surface);border:2px solid var(--border-strong);border-radius:50%;display:flex;justify-content:center;align-items:center;font-family:var(--font-mono);font-weight:600;font-size:var(--font-sm);transform:translate(-50%,-50%);z-index:2;cursor:pointer;-webkit-user-select:none;user-select:none;color:var(--text-primary);box-shadow:var(--shadow-subtle)}.graph-node.selected{border-color:var(--accent);background:var(--diff-medium-bg)}.graph-node.visited{border-color:var(--success);background:var(--diff-easy-bg);color:var(--success)}.hanoi-stage{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-2);padding:12px;border-radius:var(--bs-card-border-radius);border:1px solid var(--border-subtle)}@media (min-width: 768px){.hanoi-stage{gap:var(--space-4);padding:16px}}.peg-column{display:flex;flex-direction:column;align-items:center}.peg-title{font-family:var(--font-mono);font-weight:600;font-size:var(--font-xs);color:var(--text-secondary);margin-bottom:var(--space-2);text-transform:uppercase}.peg-container{position:relative;height:200px;width:100%;display:flex;flex-direction:column-reverse;align-items:center}@media (min-width: 768px){.peg-container{height:260px}}.peg-rod{position:absolute;bottom:12px;width:6px;height:170px;background:var(--border-strong);border-radius:var(--radius-xs) var(--radius-xs) 0 0;z-index:1}@media (min-width: 768px){.peg-rod{bottom:16px;width:8px;height:220px}}.peg-base{width:90%;height:10px;background:var(--border-strong);border-radius:var(--radius-xs);z-index:2}.hanoi-disk{height:22px;border-radius:var(--radius-xs);z-index:3;margin-bottom:2px;display:flex;align-items:center;justify-content:center;color:#fff;font-family:var(--font-mono);font-weight:600;font-size:var(--font-xs);box-shadow:0 1px 2px #00000040;transition:transform .18s cubic-bezier(.4,0,.2,1)}.disk-1{width:32%;background-color:#ef4444}.disk-2{width:46%;background-color:#f97316}.disk-3{width:60%;background-color:#eab308;color:#000}.disk-4{width:74%;background-color:#10b981}.disk-5{width:88%;background-color:#3b82f6}