:root{--bg: #080b12;--surface: #0f1521;--surface-2: #151d2c;--surface-3: #1d2739;--screen: #0a0f1b;--border: #223048;--border-strong: #2e3e5c;--ink: #e8edf6;--ink-dim: #93a1b8;--ink-faint: #5d6c84;--accent: #22d3ee;--accent-strong: #0ea5e9;--accent-ink: #04252e;--focus: #67e8f9;--comparing: #fbbf24;--swapping: #fb7185;--sorted: #34d399;--visited: #233a66;--frontier: #4f8df9;--wall: #46587a;--start: #22d3ee;--end: #fb7185;--radius-sm: 6px;--radius: 10px;--radius-lg: 14px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}#app{min-height:100vh;display:flex;flex-direction:column}main{flex:1;padding:var(--space-5) var(--space-6) var(--space-8);max-width:1200px;width:100%;margin:0 auto;min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--space-3);padding:12px var(--space-6);background:var(--surface)}.brand{display:flex;align-items:center;gap:12px;min-width:0}.logo{display:inline-flex;align-items:center;color:var(--accent);flex-shrink:0}.logo svg{display:block}.brand h1{margin:0;font-size:19px;font-weight:700;letter-spacing:-.01em;line-height:1.2}.subtitle{margin:2px 0 0;font-size:12px;color:var(--ink-faint)}.module-tabs{display:flex;gap:2px;padding:3px;background:var(--surface-2);border-radius:var(--radius)}.tab{padding:7px 16px;border:none;border-radius:calc(var(--radius) - 3px);background:transparent;color:var(--ink-dim);font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:background-color .15s ease,color .15s ease}.tab:hover{color:var(--ink)}.tab.active{background:var(--accent);color:var(--accent-ink);font-weight:600}.module{display:none}.module.active{display:block}.module-head{margin:var(--space-2) 2px var(--space-5)}.module-title{margin:0 0 4px;font-size:22px;font-weight:700;letter-spacing:-.02em;line-height:1.2}.module-subtitle{margin:0;font-size:13px;color:var(--ink-dim)}.controls{display:flex;flex-wrap:wrap;gap:14px 18px;align-items:flex-end;padding:18px;background:var(--surface);border-radius:var(--radius-lg);margin-bottom:var(--space-3)}.control-group{display:flex;flex-direction:column;gap:6px;min-width:140px}.control-group label{font-size:12px;color:var(--ink-dim);font-weight:500}.hint{color:var(--ink-faint);font-weight:400;font-size:11px}.control-group select,.panel-actions select{-webkit-appearance:none;-moz-appearance:none;appearance:none;height:36px;padding:0 30px 0 10px;background:var(--bg) url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2393a1b8' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 10px center;background-size:10px 6px;color:var(--ink);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13.5px;font-family:inherit;cursor:pointer;transition:border-color .15s ease,box-shadow .15s ease}.control-group select:hover,.panel-actions select:hover{border-color:var(--border-strong)}.control-group select:focus,.panel-actions select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #22d3ee24}.panel-actions select{height:30px;padding-right:24px;background-position:right 7px center;font-size:12px;border-radius:var(--radius-sm)}input[type=range]{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:36px;background:transparent;cursor:pointer}input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:999px;background:var(--border)}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;height:14px;width:14px;margin-top:-5px;border-radius:50%;background:var(--accent);border:2px solid var(--bg);box-shadow:0 0 0 1px var(--accent);transition:transform .12s ease,box-shadow .12s ease}input[type=range]:hover::-webkit-slider-thumb{transform:scale(1.15)}input[type=range]::-moz-range-track{height:4px;border-radius:999px;background:var(--border)}input[type=range]::-moz-range-thumb{height:12px;width:12px;border-radius:50%;background:var(--accent);border:2px solid var(--bg);box-shadow:0 0 0 1px var(--accent)}.btn-group{flex-direction:row;flex-wrap:wrap;gap:8px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;padding:0 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-2);color:var(--ink);font-size:13.5px;font-weight:500;font-family:inherit;cursor:pointer;white-space:nowrap;transition:background-color .15s ease,border-color .15s ease,color .15s ease,transform .08s ease}.btn:hover{background:var(--surface-3);border-color:var(--border-strong);color:var(--ink)}.btn:active{transform:translateY(1px)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}.btn.primary:hover{background:var(--focus);border-color:var(--focus);color:var(--accent-ink)}.btn.small{height:30px;padding:0 10px;font-size:12.5px}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.control-group.custom-group{flex:1 1 100%;min-width:0}.custom-row{display:flex;gap:8px;flex-wrap:wrap}.text-input{flex:1 1 240px;min-width:0;height:36px;padding:0 12px;background:var(--bg);color:var(--ink);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:13.5px;font-family:inherit;transition:border-color .15s ease,box-shadow .15s ease}.text-input::placeholder{color:var(--ink-faint)}.text-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #22d3ee24}.text-input.invalid{border-color:var(--swapping);box-shadow:0 0 0 3px #fb71851f}.field-error{margin:2px 0 0;font-size:12px;line-height:1.4;color:#fca5a5}.btn:focus-visible,.tab:focus-visible,.text-input:focus-visible,.control-group select:focus-visible,.control-group input:focus-visible,.panel-actions select:focus-visible,.timeline:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.stats-bar{display:flex;flex-wrap:wrap;gap:12px 32px;align-items:center;padding:14px 18px;background:var(--surface);border-radius:var(--radius-lg);margin-bottom:var(--space-3)}.stat{display:flex;flex-direction:column;gap:2px}.stat-label{font-size:11px;color:var(--ink-faint);letter-spacing:.03em}.stat-value{font-size:22px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.2;letter-spacing:-.01em}.legend{margin-left:auto;display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px;color:var(--ink-dim)}.legend-item{display:inline-flex;align-items:center;gap:6px}.swatch{display:inline-block;width:10px;height:10px;border-radius:2px}.swatch.normal{background:var(--start)}.swatch.comparing{background:var(--comparing)}.swatch.swapping{background:var(--swapping)}.swatch.sorted{background:var(--sorted)}.swatch.wall{background:var(--wall)}.swatch.start{background:var(--start)}.swatch.end{background:var(--end)}.swatch.visited{background:var(--visited)}.swatch.frontier{background:var(--frontier)}.swatch.current{background:var(--comparing)}.swatch.path{background:var(--sorted)}.timeline-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 18px;margin-bottom:var(--space-3);background:var(--surface);border-radius:var(--radius-lg)}.timeline{flex:1 1 220px;min-width:0}.timeline-percent{min-width:48px;text-align:right;font-size:13px;color:var(--ink-dim);font-variant-numeric:tabular-nums}.chart{display:flex;align-items:flex-end;gap:2px;height:420px;padding:16px 14px 10px;background:repeating-linear-gradient(to bottom,transparent 0,transparent 33px,rgba(34,211,238,.05) 33px,rgba(34,211,238,.05) 34px),var(--screen);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden}.bar{flex:1 1 0;min-width:1px;background:var(--start);border-radius:2px 2px 0 0;opacity:.92;transition:background-color .06s linear,height .14s ease,opacity .12s ease}.bar:hover{opacity:1}.bar.hidden{display:none}.bar.comparing{background:var(--comparing)}.bar.swapping{background:var(--swapping)}.bar.sorted{background:var(--sorted)}.algo-desc{margin:10px 4px 0;color:var(--ink-dim);font-size:13px;line-height:1.6}.explain-panel{background:var(--surface);border-radius:var(--radius-lg);padding:16px 18px}.explain-panel h3,.compare-panel h3{margin:0 0 8px;font-size:15px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:8px}.explain-panel h3:before,.compare-panel h3:before{content:"";width:6px;height:6px;border-radius:1.5px;background:var(--accent);box-shadow:0 0 6px #22d3ee8c;flex-shrink:0}.explain-panel p{margin:0 0 12px;color:var(--ink-dim);font-size:13px;line-height:1.65}.meta-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px 14px;margin:0}.meta-grid dt{font-size:11px;color:var(--ink-faint)}.meta-grid dd{margin:2px 0 0;font-size:13px;font-weight:600;color:var(--ink)}.pseudocode-panel{background:var(--surface);border-radius:var(--radius-lg);padding:14px 16px}.pseudocode-panel h4{margin:0 0 10px;font-size:13px;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:8px}.pseudocode-panel .hint{font-size:11px;color:var(--ink-faint);font-weight:400}.pseudocode{margin:0;font-family:SF Mono,Cascadia Code,Consolas,JetBrains Mono,monospace;font-size:12px;line-height:1.7;overflow-x:auto}.code-line{padding:2px 8px;border-radius:4px;white-space:pre;color:var(--ink-dim);transition:background-color .12s ease,color .12s ease}.code-line.highlight{background:#22d3ee24;color:var(--accent);font-weight:600}.hidden{display:none!important}.path-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:14px;align-items:start}.grid{display:grid;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius-lg);padding:3px;-webkit-user-select:none;user-select:none;touch-action:none;aspect-ratio:1 / 1;max-height:70vh;overflow:auto;min-width:0}.cell{background:var(--screen);border-radius:2px;aspect-ratio:1 / 1;transition:background-color .08s linear}.cell.wall{background:var(--wall)}.cell.start{background:var(--start)}.cell.end{background:var(--end)}.cell.visited{background:var(--visited)}.cell.frontier{background:var(--frontier)}.cell.current{background:var(--comparing)}.cell.path{background:var(--sorted)}.path-side{display:flex;flex-direction:column;gap:14px;min-width:0}.hint-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:12px 16px;margin-bottom:var(--space-3);font-size:13px;color:#fcd34d;background:#fbbf2414;border:1px solid rgba(251,191,36,.24);border-radius:var(--radius)}.hint-bar:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--comparing);box-shadow:0 0 8px #fbbf24b3;flex-shrink:0}.compare-panel{margin-top:var(--space-4);background:var(--surface);border-radius:var(--radius-lg);padding:18px}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:10px}.panel-head h3{margin:0}.panel-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--ink-dim)}.panel-actions label{display:inline-flex;align-items:center;gap:6px}.panel-note{margin:0 0 10px;font-size:12px;color:var(--ink-dim);line-height:1.6}.compare-charts{display:grid;grid-template-columns:1fr 1fr;gap:12px}.compare-side{background:var(--bg);border-radius:var(--radius);padding:12px 14px}.compare-side-title{font-weight:600;margin-bottom:8px;color:var(--ink);font-size:13px}.compare-mini-chart{height:180px;border-radius:var(--radius)}.compare-side-stats{display:flex;gap:20px;margin-top:8px;font-size:11px;color:var(--ink-faint)}.compare-side-stats strong{display:block;font-size:16px;color:var(--ink);font-variant-numeric:tabular-nums}.compare-summary{margin-top:14px}.compare-summary h4{margin:0 0 8px;font-size:13.5px;color:var(--ink)}.compare-table{width:100%;border-collapse:collapse;font-size:13px}.compare-table th,.compare-table td{padding:8px 10px;text-align:left;border-bottom:1px solid var(--border)}.compare-table th{color:var(--ink-faint);font-weight:500;font-size:11.5px}.compare-table td{font-variant-numeric:tabular-nums}.compare-table tbody tr:last-child td{border-bottom:none}.empty-state{padding:44px 20px;text-align:center;color:var(--ink-dim);border:1px dashed var(--border-strong);border-radius:var(--radius-lg);font-size:13px}.footer{margin-top:var(--space-8);text-align:center;padding:18px var(--space-4);color:var(--ink-faint);font-size:12px;background:var(--surface);line-height:1.8}.kbd{display:inline-block;padding:1px 6px;border:1px solid var(--border-strong);border-radius:4px;background:var(--surface-2);color:var(--ink-dim);font-size:10.5px;font-family:inherit}.grid::-webkit-scrollbar,.pseudocode::-webkit-scrollbar,.compare-summary::-webkit-scrollbar,#path-compare-body::-webkit-scrollbar{width:8px;height:8px}.grid::-webkit-scrollbar-thumb,.pseudocode::-webkit-scrollbar-thumb,.compare-summary::-webkit-scrollbar-thumb,#path-compare-body::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:4px}.grid::-webkit-scrollbar-track,.pseudocode::-webkit-scrollbar-track{background:transparent}@keyframes rise{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}.module.active .module-head{animation:rise .4s ease both}.module.active .controls{animation:rise .45s .05s ease both}.module.active .stats-bar{animation:rise .45s .1s ease both}.module.active .timeline-bar{animation:rise .45s .15s ease both}.module.active .chart,.module.active .path-layout{animation:rise .5s .2s ease both}.module.active .compare-panel,.module.active .explain-panel,.module.active .pseudocode-panel{animation:rise .45s .15s ease both}@media (max-width: 960px){.path-layout,.compare-charts{grid-template-columns:1fr}}@media (max-width: 640px){main{padding:var(--space-4) 14px var(--space-6)}.topbar{padding:12px 14px}.brand h1{font-size:17px}.module-tabs{width:100%}.tab{flex:1 1 0;padding:8px 10px}.module-title{font-size:19px}.controls{gap:12px;padding:12px}.control-group{flex:1 1 150px;min-width:0}.btn-group{flex:1 1 100%}.btn{padding:0 10px;font-size:13px}.stats-bar{gap:10px 18px;padding:12px 14px}.stat-value{font-size:19px}.legend{margin-left:0;gap:6px 10px}.chart{height:260px;padding:10px 8px}.compare-mini-chart{height:120px}.meta-grid{grid-template-columns:1fr}.timeline-bar{padding:10px 14px}.grid{max-height:60vh}}.compare-summary,#path-compare-body{overflow-x:auto}.compare-table{min-width:380px}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}