:root{--bg-primary: #f5f6f8;--bg-white: #ffffff;--bg-surface: #f0f1f3;--bg-hover: #eaebed;--bg-active: #e3e4e8;--bg-canvas: #e8e9ec;--text-primary: #1a1a1a;--text-secondary: #666666;--text-muted: #999999;--text-light: #bbbbbb;--accent: #4f6ef7;--accent-hover: #3b5ce5;--accent-light: #eef1fd;--accent-glow: rgba(79, 110, 247, .15);--border: #e5e6e8;--border-light: #eeeff1;--border-hover: #d0d1d5;--danger: #f56c6c;--radius-xs: 4px;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 2px 8px rgba(0, 0, 0, .08);--shadow-lg: 0 4px 20px rgba(0, 0, 0, .1);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;--transition: .18s ease}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;overflow:hidden}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);font-size:13px;line-height:1.5;-webkit-font-smoothing:antialiased}img{display:block}button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit;color:inherit}input[type=number]{font-family:inherit}.app{display:flex;flex-direction:column;height:100vh;background:var(--bg-primary)}.toolbar{display:flex;align-items:center;justify-content:space-between;height:52px;padding:0 16px;background:var(--bg-white);border-bottom:1px solid var(--border);flex-shrink:0;z-index:10}.toolbar-left,.toolbar-center,.toolbar-right,.logo{display:flex;align-items:center;gap:8px}.logo-text{font-size:15px;font-weight:600;color:var(--text-primary)}.btn{display:inline-flex;align-items:center;gap:5px;padding:7px 14px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;transition:all var(--transition);white-space:nowrap}.btn svg{flex-shrink:0}.btn-primary{background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border)}.btn-primary:hover{background:var(--bg-hover);border-color:var(--border-hover)}.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{background:var(--accent-hover)}.btn-accent:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{color:var(--text-primary);background:var(--bg-surface)}.btn-danger{color:var(--danger)}.btn-danger:hover{background:#fef2f2}.btn-icon{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:var(--radius-sm);color:var(--text-secondary);transition:all var(--transition)}.btn-icon:hover{background:var(--bg-surface);color:var(--text-primary)}.app-main{display:flex;flex:1;overflow:hidden}.panel{display:flex;flex-direction:column;background:var(--bg-white);flex-shrink:0;overflow:hidden}.panel-left{width:240px;border-right:1px solid var(--border)}.panel-right{width:260px;border-left:1px solid var(--border)}.panel-header{padding:14px 16px 10px}.panel-header h3{font-size:14px;font-weight:600;color:var(--text-primary)}.panel-body{flex:1;overflow-y:auto;padding:0 16px 16px}.panel-body::-webkit-scrollbar{width:4px}.panel-body::-webkit-scrollbar-track{background:transparent}.panel-body::-webkit-scrollbar-thumb{background:var(--bg-active);border-radius:4px}.layout-tabs{display:flex;gap:4px;padding:0 16px;margin-bottom:12px;flex-wrap:wrap}.layout-tab{padding:4px 12px;border-radius:14px;font-size:13px;font-weight:500;color:var(--text-secondary);background:var(--bg-surface);border:1px solid transparent;transition:all var(--transition)}.layout-tab:hover{color:var(--text-primary);background:var(--bg-hover)}.layout-tab.active{color:var(--accent);background:var(--accent-light);border-color:var(--accent)}.layout-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.layout-thumb{aspect-ratio:1;background:var(--bg-surface);border:2px solid transparent;border-radius:var(--radius-md);padding:5px;cursor:pointer;transition:all var(--transition);display:grid;gap:2px}.layout-thumb:hover{border-color:var(--border-hover);background:var(--bg-hover)}.layout-thumb.active{border-color:var(--accent);background:var(--accent-light)}.layout-thumb-cell{background:#c5c7cc;border-radius:2px;min-height:0}.layout-thumb.active .layout-thumb-cell{background:#a0aef7}.canvas-area{flex:1;display:flex;align-items:center;justify-content:center;padding:32px;background:var(--bg-canvas);overflow:hidden;position:relative}.puzzle-canvas{position:relative;width:100%;max-width:600px;border-radius:2px;overflow:visible;box-shadow:var(--shadow-lg);transition:aspect-ratio .3s ease}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px;height:100%;min-height:400px;background:var(--bg-white);border:1px solid var(--border);border-radius:2px;cursor:pointer;transition:all var(--transition)}.empty-state:hover{border-color:var(--accent);background:#fafbff}.empty-icon{margin-bottom:16px;color:var(--text-light)}.empty-title{font-size:15px;font-weight:500;color:var(--text-secondary);margin-bottom:6px}.empty-desc{font-size:12px;color:var(--text-muted)}.puzzle-grid{display:grid;width:100%;height:100%;position:relative}.puzzle-cell{position:relative;overflow:hidden;cursor:grab;-webkit-user-select:none;user-select:none;background:var(--bg-white);border:1px solid var(--border-light)}.puzzle-cell:active{cursor:grabbing}.puzzle-cell-empty{display:flex;align-items:center;justify-content:center;background:var(--bg-white);border:1px solid var(--border)}.puzzle-cell-empty-icon{color:var(--text-light)}.puzzle-cell-overlay{position:absolute;inset:0;background:transparent;opacity:0;transition:opacity var(--transition);display:flex;align-items:center;justify-content:center}.puzzle-cell:hover .puzzle-cell-overlay{opacity:1;background:#0000000f}.param-group{margin-bottom:16px}.param-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.param-label span:first-child{font-size:13px;font-weight:500;color:var(--text-primary)}.param-value{font-size:12px;color:var(--text-secondary);font-weight:500;font-variant-numeric:tabular-nums}.param-input{width:56px;height:28px;border:1px solid var(--border);border-radius:var(--radius-xs);text-align:center;font-size:12px;color:var(--text-primary);background:var(--bg-white);outline:none;transition:border-color var(--transition)}.param-input:focus{border-color:var(--accent)}.slider{-webkit-appearance:none;appearance:none;width:100%;height:4px;border-radius:2px;background:var(--border);outline:none;transition:background var(--transition)}.slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid #fff;box-shadow:0 1px 4px #00000026;transition:transform var(--transition)}.slider::-webkit-slider-thumb:hover{transform:scale(1.15)}.slider::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid #fff}.slider-row{display:flex;align-items:center;gap:10px}.slider-row .slider{flex:1}.color-options{display:flex;flex-direction:column;gap:10px}.color-presets{display:flex;flex-wrap:wrap;gap:6px}.color-swatch{width:26px;height:26px;border-radius:var(--radius-xs);border:2px solid transparent;cursor:pointer;transition:all var(--transition);outline:1px solid var(--border)}.color-swatch:hover{transform:scale(1.1)}.color-swatch.active{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-glow)}.color-swatch[data-color="#ffffff"]{outline:1px solid var(--border-hover)}.color-custom{display:flex;align-items:center;gap:8px}.color-picker-label{font-size:12px;color:var(--text-secondary)}.color-picker{-webkit-appearance:none;appearance:none;border:none;width:28px;height:26px;border-radius:var(--radius-xs);cursor:pointer;background:transparent}.color-picker::-webkit-color-swatch-wrapper{padding:0}.color-picker::-webkit-color-swatch{border:1px solid var(--border);border-radius:var(--radius-xs)}.tab-group{display:flex;background:var(--bg-surface);border-radius:var(--radius-sm);padding:2px;gap:2px}.tab-btn{flex:1;padding:5px 8px;border-radius:var(--radius-xs);font-size:12px;font-weight:500;color:var(--text-secondary);text-align:center;transition:all var(--transition)}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{background:var(--bg-white);color:var(--text-primary);box-shadow:var(--shadow-sm)}.ratio-options,.size-options,.export-options{display:flex;gap:4px;flex-wrap:wrap}.ratio-btn,.size-btn,.export-format-btn{padding:5px 10px;border-radius:var(--radius-xs);font-size:12px;font-weight:500;color:var(--text-secondary);background:var(--bg-surface);border:1px solid transparent;transition:all var(--transition)}.ratio-btn:hover,.size-btn:hover,.export-format-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.ratio-btn.active,.size-btn.active,.export-format-btn.active{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}.canvas-size-row{display:flex;align-items:center;gap:6px}.canvas-size-input{flex:1;height:32px;border:1px solid var(--border);border-radius:var(--radius-xs);padding:0 8px;font-size:13px;color:var(--text-primary);text-align:center;background:var(--bg-white);outline:none;transition:border-color var(--transition)}.canvas-size-input:focus{border-color:var(--accent)}.canvas-size-label{font-size:11px;color:var(--text-muted);white-space:nowrap}.canvas-size-link{display:flex;align-items:center;justify-content:center;width:24px;height:24px;color:var(--text-muted);cursor:pointer;transition:color var(--transition)}.canvas-size-link:hover{color:var(--accent)}.divider{border:none;height:1px;background:var(--border-light);margin:14px 0}.drop-overlay{position:fixed;inset:0;z-index:100;background:#ffffffd9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .3s ease}.drop-overlay.active{opacity:1;pointer-events:auto}.drop-content{display:flex;flex-direction:column;align-items:center;gap:12px;color:var(--accent)}.drop-content p{font-size:16px;font-weight:500;color:var(--text-primary)}.export-loading{position:fixed;inset:0;z-index:200;background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px}.export-loading p{color:var(--text-secondary);font-size:14px}.loading-spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.image-tray{position:fixed;bottom:0;left:240px;right:260px;max-height:180px;background:var(--bg-white);border-top:1px solid var(--border);z-index:20;display:flex;flex-direction:column}.tray-header{display:flex;justify-content:space-between;align-items:center;padding:8px 16px;border-bottom:1px solid var(--border-light)}.tray-header h4{font-size:12px;font-weight:500;color:var(--text-secondary)}.tray-grid{display:flex;gap:8px;padding:10px 16px;overflow-x:auto;flex:1}.tray-grid::-webkit-scrollbar{height:3px}.tray-grid::-webkit-scrollbar-thumb{background:var(--bg-active);border-radius:4px}.tray-item{position:relative;width:56px;height:56px;flex-shrink:0;border-radius:var(--radius-xs);overflow:hidden;border:2px solid transparent;cursor:pointer;transition:all var(--transition)}.tray-item:hover{border-color:var(--accent)}.tray-item img{width:100%;height:100%;object-fit:cover}.tray-item-remove{position:absolute;top:2px;right:2px;width:16px;height:16px;border-radius:50%;background:#00000080;color:#fff;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity var(--transition);font-size:11px;line-height:1}.tray-item:hover .tray-item-remove{opacity:1}.zoom-hint{position:absolute;bottom:6px;left:50%;transform:translate(-50%);font-size:10px;color:#fff;background:#00000080;padding:2px 8px;border-radius:10px;pointer-events:none;opacity:0;transition:opacity .3s;white-space:nowrap}.puzzle-cell:hover .zoom-hint{opacity:1}.bottom-bar{display:flex;align-items:center;justify-content:center;gap:8px;padding:6px 16px;background:var(--bg-white);border-top:1px solid var(--border);position:fixed;bottom:0;left:240px;right:260px;z-index:15}.bottom-bar .zoom-display{font-size:12px;color:var(--text-secondary);font-variant-numeric:tabular-nums;min-width:40px;text-align:center}.section-title{font-size:13px;font-weight:600;color:var(--text-primary);margin-bottom:10px;margin-top:4px}