:root{--primary-color: #007acc;--secondary-color: #1e1e1e;--accent-color: #4fc3f7;--background-dark: #0d1117;--background-medium: #161b22;--background-light: #21262d;--border-color: #30363d;--text-primary: #f0f6fc;--text-secondary: #8b949e;--success-color: #238636;--error-color: #da3633;--warning-color: #d29922}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--background-dark);color:var(--text-primary);overflow:hidden;line-height:1.6}#root{height:100vh;width:100vw;display:flex;flex-direction:column}.canvas-container{position:relative;flex:1;overflow:hidden;background:var(--background-medium)}.canvas-stage,.canvas-stage.drawing{cursor:crosshair}.canvas-stage.dragging{cursor:grabbing}.toolbar{background:var(--background-light);border-bottom:1px solid var(--border-color);padding:12px;display:flex;align-items:center;gap:12px;-webkit-user-select:none;user-select:none}.toolbar-section{display:flex;align-items:center;gap:8px;padding:0 12px;border-right:1px solid var(--border-color)}.toolbar-section:last-child{border-right:none}.toolbar-button{background:var(--background-medium);border:1px solid var(--border-color);color:var(--text-primary);padding:8px 12px;border-radius:4px;cursor:pointer;transition:all .2s ease;font-size:14px;display:flex;align-items:center;gap:6px}.toolbar-button:hover{background:var(--background-dark);border-color:var(--primary-color)}.toolbar-button.active{background:var(--primary-color);border-color:var(--primary-color);color:#fff}.toolbar-button:disabled{opacity:.5;cursor:not-allowed}.shape-palette{position:absolute;top:70px;left:12px;background:var(--background-light);border:1px solid var(--border-color);border-radius:8px;padding:12px;z-index:100;box-shadow:0 4px 12px #0000004d}.shape-palette-header{font-size:14px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}.shape-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;width:200px}.shape-item{aspect-ratio:1;background:var(--background-medium);border:1px solid var(--border-color);border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;position:relative}.shape-item:hover{background:var(--background-dark);border-color:var(--primary-color)}.shape-item.selected{background:var(--primary-color);border-color:var(--primary-color)}.shape-item svg{width:24px;height:24px;fill:var(--text-primary)}.shape-item.selected svg{fill:#fff}.shape-label{position:absolute;bottom:-20px;left:50%;transform:translate(-50%);font-size:10px;color:var(--text-secondary);white-space:nowrap}.code-panel{position:absolute;top:70px;right:12px;width:400px;height:calc(100vh - 140px);background:var(--background-light);border:1px solid var(--border-color);border-radius:8px;z-index:100;box-shadow:0 4px 12px #0000004d;display:flex;flex-direction:column}.code-panel-header{padding:12px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}.code-panel-title{font-size:14px;font-weight:600;color:var(--text-primary)}.language-selector{background:var(--background-medium);border:1px solid var(--border-color);color:var(--text-primary);padding:4px 8px;border-radius:4px;font-size:12px}.code-editor{flex:1;overflow:hidden}.grid-overlay{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;opacity:.1;background-image:linear-gradient(var(--border-color) 1px,transparent 1px),linear-gradient(90deg,var(--border-color) 1px,transparent 1px);background-size:20px 20px}.canvas-stage{cursor:default}.canvas-stage.drawing{cursor:crosshair}.canvas-stage.connecting,.canvas-stage.connecting .konvajs-content{cursor:pointer}.connection-hint{position:absolute;top:10px;left:50%;transform:translate(-50%);background:var(--accent-color);color:#fff;padding:8px 16px;border-radius:4px;font-size:14px;z-index:1000;box-shadow:0 2px 8px #0003;animation:slideDown .3s ease}@keyframes slideDown{0%{opacity:0;transform:translate(-50%) translateY(-10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.status-bar{background:var(--background-light);border-top:1px solid var(--border-color);padding:8px 12px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--text-secondary)}.status-item{display:flex;align-items:center;gap:4px}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .3s ease-out}@media (max-width: 768px){.code-panel{width:300px}.shape-palette{width:160px}.shape-grid{width:160px;grid-template-columns:repeat(2,1fr)}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--background-medium)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}