:root{--bg:#111;--panel:#1e1e1e;--accent:#ff6b6b}
html,body{height:100%;margin:0;background:var(--bg);color:#eee;font-family:system-ui,Segoe UI,Roboto,Helvetica,Arial}
#app{padding:12px;max-width:1100px;margin:0 auto}
#controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:8px}
#controls label{font-size:13px;color:#ddd}
.panels{display:flex;gap:12px}
.panel{flex:1}
.panel h4{margin:6px 0 6px 0;color:#ddd}
.canvasWrap{position:relative;border:1px solid #333;background:#000;display:block;max-width:100%;height:420px}
.canvasWrap canvas{position:absolute;left:0;top:0;width:100%;height:100%;}
.canvasWrap canvas{image-rendering:optimizeSpeed}
.canvasWrap canvas{image-rendering:-moz-crisp-edges}
#draw{cursor:crosshair}
.note{color:#aaa;margin-top:8px}
.panel-controls{margin-top:8px;display:flex;gap:8px;align-items:center}
.panel-controls button{padding:6px 10px}

/* segmented tool toggle */
.tool-toggle{display:inline-flex;border:1px solid #333;border-radius:6px;overflow:hidden;background:var(--panel)}
.tool-toggle .tool-btn{background:transparent;border:0;color:#ddd;padding:6px 10px;cursor:pointer}
.tool-toggle .tool-btn.selected{background:linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));color:#fff}
.tool-toggle .tool-btn:focus{outline:2px solid rgba(255,255,255,0.06)}
button{background:var(--panel);border:1px solid #333;color:#eee;padding:6px 8px;border-radius:4px}