:root{--toolbar-height: 56px;--toolbar-bg: #ffffff;--toolbar-border: #e5e7eb;--btn-hover: #f3f4f6;--btn-active: #e5e7eb;--primary-color: #2563eb;--canvas-bg: #ffffff;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--radius-sm: 6px;--radius-md: 8px}*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--canvas-bg);-webkit-user-select:none;user-select:none;overscroll-behavior:none}.toolbar{position:fixed;top:0;left:0;right:0;height:var(--toolbar-height);background:var(--toolbar-bg);border-bottom:1px solid var(--toolbar-border);display:flex;align-items:center;justify-content:space-between;padding:0 12px;z-index:100;box-shadow:var(--shadow-sm);touch-action:manipulation}.menu-wrapper{position:relative;display:none}.menu-btn{display:flex}.menu-dropdown{position:absolute;top:calc(100% + 8px);right:0;left:auto;background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-md);padding:6px;display:none;visibility:hidden;opacity:0;flex-direction:column;gap:2px;min-width:200px;z-index:200}.menu-dropdown.show{display:flex;visibility:visible;opacity:1}.menu-option{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border:none;background:transparent;border-radius:var(--radius-sm);cursor:pointer;font-size:14px;color:#374151;text-align:left}.menu-option:hover{background:var(--btn-hover)}.menu-option svg{width:18px;height:18px;flex-shrink:0}.menu-divider{height:1px;background:var(--toolbar-border);margin:4px 0}.mobile-tools{display:none;align-items:center;gap:2px;overflow:visible;touch-action:manipulation}.mobile-tools .toolbar-btn,.mobile-tools .color-picker,.mobile-tools .stroke-picker,.mobile-tools .smart-shape-picker{flex-shrink:0}.mobile-tools .toolbar-btn{touch-action:manipulation;-webkit-tap-highlight-color:transparent}.mobile-tools 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transparent;cursor:pointer;transition:transform .15s,border-color .15s}.color-option:hover{transform:scale(1.1)}.color-option.active{border-color:#374151}.stroke-dropdown{flex-direction:column;padding:6px;gap:4px}.smart-shape-dropdown{flex-direction:column;gap:10px;padding:10px;min-width:220px}.smart-shape-row{display:flex;align-items:center;justify-content:space-between;gap:10px}.smart-shape-toggle{display:flex;align-items:center;gap:10px;font-size:14px;color:#111827;cursor:pointer;-webkit-user-select:none;user-select:none}.smart-shape-toggle 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svg{width:18px;height:18px}}.images-layer{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1}.images-layer .imported-image{position:absolute;pointer-events:auto;cursor:move;border:2px solid transparent;transition:border-color .2s}.images-layer .imported-image:hover,.images-layer .imported-image.selected{border-color:var(--primary-color)}.images-layer .imported-image img{display:block;max-width:100%;height:auto;pointer-events:none}.images-layer .imported-image .resize-handle{position:absolute;width:12px;height:12px;background:var(--primary-color);border:2px solid white;border-radius:2px;cursor:se-resize;right:-6px;bottom:-6px;display:none}.images-layer .imported-image.selected .resize-handle{display:block}.images-layer .imported-image 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