:root{--bg-primary: #ffffff;--bg-secondary: #f5f5f5;--bg-panel: rgba(255, 255, 255, .95);--border-color: #d0d0d0;--text-primary: #2c3e50;--text-secondary: #7f8c8d;--primary-color: #4a90e2;--success-color: #4caf50;--warning-color: #ff9800;--error-color: #f44336;--grid-empty: #ffffff;--grid-wall: #34495e;--grid-start: #27ae60;--grid-goal: #e74c3c;--grid-open: #3498db;--grid-closed: #95a5a6;--grid-path: #f39c12;--grid-border: #ecf0f1}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);overflow:hidden}#app{display:flex;flex-direction:column;height:100vh}.floating-panel{position:fixed;background:var(--bg-panel);backdrop-filter:blur(10px);border:1px solid var(--border-color);border-radius:12px;box-shadow:0 8px 32px #0000001a;z-index:1000;will-change:transform}.floating-panel.dragging{transition:none!important;user-select:none}#control-panel{top:20px;left:20px;width:280px;max-height:calc(100vh - 120px);overflow-y:auto}.pathfinding-panel{bottom:50px;left:50%;transform:translate(-50%);width:auto}.pathfinding-panel.collapsed{transform:translate(-50%)}.playback-bar{display:flex;align-items:center;gap:4px}.playback-divider{width:1px;height:24px;background-color:var(--border-color);margin:0 4px}.btn-icon{width:36px;height:36px;padding:0;background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:4px;font-size:1rem;cursor:pointer;transition:all .15s ease;display:flex;align-items:center;justify-content:center}.btn-icon:hover:not(:disabled){background-color:var(--border-color);border-color:var(--primary-color)}.btn-icon:disabled{opacity:.4;cursor:not-allowed}.btn-icon-action{height:36px;padding:0 12px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .15s ease;display:flex;align-items:center;gap:4px}.btn-icon-action:hover{background-color:#357abd}.btn-icon-text{height:36px;padding:0 10px;background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:4px;font-size:.8rem;font-weight:500;cursor:pointer;transition:all .15s ease}.btn-icon-text:hover{background-color:var(--border-color)}.speed-control-inline{display:flex;align-items:center;gap:8px;margin-top:10px;padding-top:10px;border-top:1px solid var(--border-color)}.speed-control-inline label{font-size:.8rem;color:var(--text-secondary);white-space:nowrap;margin:0;text-transform:none;letter-spacing:normal}.speed-control-inline input[type=range]{flex:1;min-width:80px}.speed-control-inline span{font-size:.8rem;color:var(--text-secondary);min-width:50px;text-align:right}.statistics-panel{top:20px;right:20px;width:auto}.statistics-panel .panel-content{overflow:visible;max-height:none}.panel-header{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--border-color);cursor:grab;user-select:none}.panel-header:active{cursor:grabbing}.panel-header h3{font-size:.95rem;font-weight:600;margin:0;flex:1;color:var(--text-primary)}.drag-handle{font-size:18px;color:var(--text-secondary);cursor:grab}.collapse-btn{background:none;border:none;color:var(--text-secondary);font-size:1.2rem;font-weight:700;cursor:pointer;padding:4px 8px;line-height:1;transition:color .2s}.collapse-btn:hover{color:var(--text-primary)}.floating-panel.collapsed .panel-content{display:none}.floating-panel.collapsed .collapse-btn{transform:rotate(180deg)}.panel-content{overflow-y:auto;max-height:calc(100vh - 200px)}.panel-section{padding:16px;border-bottom:1px solid rgba(208,208,208,.3)}.panel-section:last-child{border-bottom:none}.panel-section label{display:block;font-size:.85rem;font-weight:600;margin-bottom:8px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.panel-section h4{font-size:.85rem;font-weight:600;margin-bottom:12px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.button-group{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.button-group.mode-toggle{grid-template-columns:1fr 1fr}.btn-mode{padding:8px 12px;background-color:var(--bg-secondary);color:var(--text-primary);border:2px solid var(--border-color);border-radius:6px;font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-mode:hover{background-color:var(--border-color);border-color:var(--primary-color)}.btn-mode.active{background-color:var(--primary-color);border-color:var(--primary-color);color:#fff}.btn-action{width:100%;padding:10px;background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:6px;font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease;margin-bottom:8px}.btn-action:last-child{margin-bottom:0}.btn-action:hover{background-color:var(--border-color)}.pathfinding-controls{display:flex;gap:8px;flex-wrap:wrap}.btn-pathfinding{flex:1;min-width:100px;padding:12px 20px;background-color:var(--primary-color);color:#fff;border:none;border-radius:6px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s ease}.btn-pathfinding:hover{background-color:#357abd;transform:translateY(-1px);box-shadow:0 4px 8px #00000026}.btn-pathfinding:active{transform:translateY(0)}.btn-pathfinding-secondary{flex:0;min-width:100px;padding:12px 20px;background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:6px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-pathfinding-secondary:hover{background-color:var(--border-color)}#step-controls-section{margin-top:12px;padding-top:12px;border-top:1px solid var(--border-color)}.playback-controls{display:flex;gap:8px;margin-bottom:12px}.btn-playback{flex:1;padding:10px;background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:6px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-playback:hover{background-color:var(--border-color);border-color:var(--primary-color)}.speed-control{display:flex;flex-direction:column;gap:6px}.speed-control label{font-size:.85rem;color:var(--text-secondary);display:flex;justify-content:space-between;align-items:center}.speed-control input[type=range]{width:100%}.input-select{width:100%;padding:.6rem;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:4px;color:var(--text-primary);font-size:.9rem;cursor:pointer}.input-select:focus{outline:none;border-color:var(--primary-color)}.checkbox-group{display:flex;flex-direction:column;gap:8px}.checkbox-label{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.9rem;font-weight:400;text-transform:none;letter-spacing:normal;color:var(--text-primary);margin-bottom:0}.checkbox-label input[type=checkbox]{width:16px;height:16px;cursor:pointer;accent-color:var(--primary-color)}.btn{width:100%;padding:.7rem;border:none;border-radius:4px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s ease;margin-bottom:.5rem}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:#357abd}.btn-secondary{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--border-color)}.btn-icon{width:calc(25% - .25rem);padding:.5rem;font-size:1rem}.tool-buttons{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;margin-bottom:0}.btn-tool{width:100%;padding:.75rem;background-color:var(--bg-secondary);color:var(--text-primary);border:2px solid var(--border-color);display:flex;flex-direction:column;align-items:center;gap:.25rem;margin-bottom:0;transition:all .2s ease}.btn-tool:hover{background-color:var(--border-color);border-color:var(--primary-color)}.btn-tool.active{background-color:var(--primary-color);border-color:var(--primary-color);box-shadow:0 0 10px #4a90e24d}.btn-tool.active:hover{background-color:#357abd}.tool-icon{font-size:1.5rem;line-height:1}.tool-label{font-size:.75rem;font-weight:500;text-transform:uppercase;letter-spacing:.5px}.playback-controls{display:flex;gap:.25rem;margin-bottom:1rem}.speed-control{display:flex;align-items:center;gap:.5rem;margin-top:1rem}.speed-control label{font-size:.9rem;color:var(--text-secondary)}.speed-control input[type=range]{flex:1}#statistics{display:flex;flex-direction:column;gap:.75rem}.statistics-panel .stat-item{display:flex;align-items:center;gap:8px;padding:8px 16px;font-size:.9rem}.statistics-panel .stat-item span:first-child{color:var(--text-secondary);font-weight:500}.statistics-panel .stat-item span:last-child{font-weight:600;color:var(--primary-color);font-size:1rem}.instructions{list-style:none}.instructions li{font-size:.85rem;color:var(--text-secondary);margin-bottom:.5rem;padding-left:.5rem}.instructions strong{color:var(--text-primary)}.canvas-container{position:fixed;top:0;left:0;width:100vw;height:100vh;display:flex;align-items:center;justify-content:center;background-color:var(--bg-primary);overflow:hidden}#grid-canvas{border:2px solid var(--border-color);box-shadow:0 4px 6px #0000001a;cursor:default;image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges}.color-legend{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:8px;padding:12px;background:var(--bg-panel);backdrop-filter:blur(10px);border:1px solid var(--border-color);border-radius:8px;font-size:12px;z-index:998}.legend-item{display:flex;align-items:center;gap:8px;cursor:help}.legend-swatch{width:20px;height:20px;border-radius:4px;border:1px solid var(--border-color)}.stat-section-header{font-size:.85rem;font-weight:600;margin-top:12px;margin-bottom:8px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;padding:0 16px}.stat-sub-item{padding-left:24px!important;opacity:.9}.stat-sub-item span:last-child{font-size:.95rem}.hpa-setting-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}.hpa-setting-row label{flex:0 0 auto;margin:0;font-size:.9rem;color:var(--text-primary);font-weight:400;text-transform:none}.hpa-setting-row input[type=range]{flex:1;min-width:100px}.hpa-setting-row span{flex:0 0 auto;min-width:30px;text-align:right;font-weight:600;color:var(--primary-color)}@media (max-width: 768px){#control-panel{width:calc(100% - 40px);max-height:50vh;top:10px;left:10px;right:10px}.pathfinding-panel{left:10px;right:10px;bottom:10px;transform:none;min-width:auto;width:calc(100% - 20px)}.pathfinding-panel.collapsed{transform:none}.statistics-panel{right:10px;bottom:auto;top:10px;min-width:200px}.color-legend{display:none}.panel-section{padding:12px}.button-group{grid-template-columns:1fr 1fr}.btn-mode{padding:6px 10px;font-size:.8rem}.btn-pathfinding,.btn-pathfinding-secondary{padding:10px 16px;font-size:.85rem}.pathfinding-controls{flex-direction:column}.btn-pathfinding,.btn-pathfinding-secondary{min-width:auto}}