:root{--dock-bg:rgba(30,30,30,.85);--dock-border:rgba(255,255,255,.1);--accent:#3b82f6;--text:#e5e5e5;--bg-dark:#525659;--header-height:50px}.filename-display{flex:1;text-align:center;color:var(--text);font-weight:500;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:0 20px;opacity:.9}.header-btn{background:transparent;border:none;color:var(--text);width:40px;height:40px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;cursor:pointer;transition:background .2s}.header-btn:hover:not(:disabled){background:rgba(255,255,255,.1);color:rgb(34,34,34)}.header-btn:disabled{opacity:.3;cursor:not-allowed}.header-btn.save-btn{color:rgb(23,23,23)}#file-input{display:none}.top-toolbar{position:relative;display:flex;justify-content:center;align-items:center;padding:10px;background:#ffffff;z-index:10}.top-toolbar{border-bottom:1px solid #e0e0e0;box-shadow:0 2px 4px rgba(0,0,0,.05)}.bottom-toolbar{border-top:1px solid 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left;min-width:20px}.text-annotation:hover{border-color:var(--accent);background:rgba(255,255,255,.2)}.text-annotation.editing{border-color:var(--accent);background:rgba(255,255,255,.9);cursor:text;z-index:100}.text-content{outline:none;width:100%;height:100%}.text-annotation:hover .resize-handle,.text-annotation:hover .delete-btn{display:flex}#message{position:fixed;bottom:24px;right:24px;padding:12px 20px;background:#10b981;color:white;border-radius:8px;font-weight:500;box-shadow:0 5px 15px rgba(0,0,0,.2);display:none;z-index:2000}canvas{display:block;image-rendering:optimizeSpeed;image-rendering:-webkit-optimize-contrast}.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.7);backdrop-filter:blur(5px);z-index:9999;display:none;flex-direction:column;justify-content:center;align-items:center;color:white}.loading-overlay .spinner-border{width:3rem;height:3rem;margin-bottom:15px;border-width:4px;color:var(--accent)}.loading-overlay 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