:root{--bg-color: #121212;--panel-bg: #1e1e1e;--accent-color: #3b82f6;--text-primary: #f3f4f6;--border-color: #333}*{box-sizing:border-box}body{margin:0;background-color:var(--bg-color);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;overflow:hidden;-webkit-tap-highlight-color:transparent}.app-container{display:flex;flex-direction:column;height:100vh;height:100dvh}.header{height:50px;background-color:var(--panel-bg);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 16px;flex-shrink:0}.logo{font-size:1rem;font-weight:700;display:flex;align-items:center;gap:8px}.status-badge{font-size:.8rem;color:#888}.workspace{flex:1;display:flex;overflow:hidden;position:relative}.canvas-area{flex:1;background-color:#000;background-image:linear-gradient(45deg,#1a1a1a 25%,transparent 25%),linear-gradient(-45deg,#1a1a1a 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#1a1a1a 75%),linear-gradient(-45deg,transparent 75%,#1a1a1a 75%);background-size:20px 20px;display:flex;align-items:center;justify-content:center;overflow:auto;padding:20px;position:relative}.canvas-wrapper{box-shadow:0 0 20px #00000080;line-height:0}canvas{max-width:100%;height:auto;display:block;touch-action:none;cursor:crosshair}.sidebar{width:260px;background-color:var(--panel-bg);border-left:1px solid var(--border-color);padding:20px;display:flex;flex-direction:column;gap:20px;z-index:10}.tool-group{display:flex;gap:10px;width:100%}.file-ops{flex-direction:row}.slider-group{flex-direction:column}.action-ops{flex-direction:column;margin-top:auto}.btn{height:40px;border-radius:8px;border:none;font-size:.9rem;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;transition:opacity .2s;padding:0 16px}.btn:active{opacity:.7}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--accent-color);color:#fff;flex:1}.btn-secondary{background:#333;color:#fff;border:1px solid #444}.icon-only{padding:0;width:40px;flex-shrink:0}.full-width{flex:1}.file-input-wrapper{position:relative;display:flex}.file-input-wrapper .btn{width:100%}.hidden-input{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer}input[type=range]{width:100%;height:4px;background:#444;border-radius:2px;outline:none;-webkit-appearance:none}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;background:var(--accent-color);border-radius:50%}.placeholder{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#666;pointer-events:none}.loading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;z-index:20}.spinner{width:30px;height:30px;border:3px solid rgba(255,255,255,.2);border-top-color:var(--accent-color);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:10px}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 768px){.workspace{flex-direction:column}.sidebar{width:100%;height:auto;flex-direction:row;align-items:center;padding:10px 15px;padding-bottom:max(10px,env(safe-area-inset-bottom));border-left:none;border-top:1px solid var(--border-color);background:#181818;justify-content:space-between;gap:10px}.tool-group{width:auto;gap:8px;margin:0}.file-ops{order:1}.slider-group{order:2;flex:1;max-width:120px}.action-ops{order:3;flex-direction:row}.btn-text{display:none}.btn{width:44px;height:44px;padding:0}.file-input-wrapper{width:auto}.canvas-area{padding:10px}}