:root{--primary-color: #0d99ff;--secondary-color: #444;--bg-color: #f0f0f0;--panel-bg: #ffffff;--border-color: #e0e0e0;--header-height: 48px;--sidebar-width: 240px;--toolbar-height: 40px;--font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-primary);background-color:var(--bg-color);color:#333;overflow:hidden;height:100vh}.app-container{display:flex;flex-direction:column;height:100vh}.app-header{height:var(--header-height);background-color:var(--panel-bg);border-bottom:1px solid var(--border-color);display:flex;align-items:center;padding:0 16px;box-shadow:0 1px 3px #0000001a;z-index:10}.logo{font-weight:700;font-size:18px;color:var(--primary-color);margin-right:24px}.file-menu{display:flex;gap:16px}.file-menu button{background:none;border:none;cursor:pointer;padding:4px 8px;font-size:14px;border-radius:4px}.file-menu button:hover{background-color:#0000000d}.main-content{display:flex;flex:1;overflow:hidden}.sidebar{width:var(--sidebar-width);background-color:var(--panel-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column;overflow-y:auto}.layers-panel,.properties-panel{padding:12px;border-bottom:1px solid var(--border-color)}.panel-title{font-size:12px;text-transform:uppercase;color:var(--secondary-color);margin-bottom:8px;font-weight:600}.layer-item{display:flex;align-items:center;padding:6px 8px;border-radius:4px;margin-bottom:2px;font-size:13px;cursor:pointer}.layer-item:hover{background-color:#0000000d}.layer-item.selected{background-color:#0d99ff1a}.layer-item .layer-name{margin-left:8px}.layer-item .layer-icon{width:16px;height:16px;display:flex;align-items:center;justify-content:center;color:#777}.property-group{margin-bottom:16px}.property-row{display:flex;align-items:center;margin-bottom:8px;font-size:12px}.property-label{width:80px;color:var(--secondary-color)}.property-value{flex:1}.property-value input,.property-value select{width:100%;padding:4px 8px;border:1px solid var(--border-color);border-radius:4px;font-size:12px}.canvas-container{flex:1;position:relative;overflow:hidden;background-color:var(--bg-color)}.toolbar{height:var(--toolbar-height);background-color:var(--panel-bg);border-bottom:1px solid var(--border-color);display:flex;align-items:center;padding:0 16px}.tool-button{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:4px;margin-right:8px;cursor:pointer;color:var(--secondary-color);background:none;border:none}.tool-button:hover{background-color:#0000000d}.tool-button.active{background-color:#0d99ff1a;color:var(--primary-color)}.canvas{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background-color:#fff;box-shadow:0 0 10px #00000026;overflow:hidden}.canvas-element{position:absolute;-webkit-user-select:none;user-select:none}.canvas-element.selected{outline:2px solid var(--primary-color)}.resize-handle{position:absolute;width:8px;height:8px;background-color:#fff;border:1px solid var(--primary-color);z-index:10}.resize-handle.nw{top:-4px;left:-4px;cursor:nwse-resize}.resize-handle.ne{top:-4px;right:-4px;cursor:nesw-resize}.resize-handle.sw{bottom:-4px;left:-4px;cursor:nesw-resize}.resize-handle.se{bottom:-4px;right:-4px;cursor:nwse-resize}.color-picker{display:flex;align-items:center}.color-preview{width:16px;height:16px;border-radius:2px;border:1px solid var(--border-color);margin-right:8px}.color-input{width:100%}.dropdown{position:relative;display:inline-block}.dropdown-content{display:none;position:absolute;background-color:var(--panel-bg);min-width:160px;box-shadow:0 8px 16px #0000001a;z-index:100;border-radius:4px}.dropdown-content.show{display:block}.dropdown-item{padding:8px 12px;font-size:14px;cursor:pointer}.dropdown-item:hover{background-color:#0000000d}.context-menu{position:fixed;background-color:var(--panel-bg);min-width:160px;box-shadow:0 8px 16px #0000001a;z-index:1000;border-radius:4px;display:none}.context-menu.show{display:block}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background-color:var(--panel-bg);border-radius:8px;padding:24px;min-width:400px;max-width:90vw}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.modal-title{font-size:18px;font-weight:600}.modal-close{background:none;border:none;font-size:16px;cursor:pointer}.modal-body{margin-bottom:24px}.modal-footer{display:flex;justify-content:flex-end;gap:12px}.btn{padding:8px 16px;border-radius:4px;font-size:14px;cursor:pointer;border:none}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-secondary{background-color:transparent;border:1px solid var(--border-color)}.btn:hover{opacity:.9}.status-bar{height:24px;background-color:var(--panel-bg);border-top:1px solid var(--border-color);display:flex;align-items:center;padding:0 16px;font-size:12px;color:var(--secondary-color)}.status-item{margin-right:16px}.zoom-controls{display:flex;align-items:center;margin-left:auto}.zoom-level{margin:0 8px}