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10px;font-size:12px;font-weight:600;line-height:26px;min-width:70px;text-align:center;color:var(--text)}.canvas-wrap{flex:1;position:relative;background:linear-gradient(to bottom,var(--border-soft),var(--border));min-width:0;overflow:hidden}#canvas{width:100%;height:100%;display:block;touch-action:none}.overlay{position:absolute;z-index:10;background:#fffffff0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border);box-shadow:0 4px 14px #0f172a14;border-radius:8px}.undo-toolbar{top:14px;left:14px;display:flex;padding:4px;gap:2px}.undo-btn{width:30px;height:30px;padding:0;display:inline-flex;align-items:center;justify-content:center;border:none;background:transparent;cursor:pointer;font-family:inherit;color:var(--text-dark);border-radius:4px}.undo-btn:hover:not(:disabled){background:var(--accent-bg);color:var(--accent)}.undo-btn:disabled{color:var(--border);cursor:not-allowed}.undo-btn 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14px;position:relative;font-size:11px;color:var(--text-muted)}.help-intro-list li:before{content:"·";position:absolute;left:4px;color:var(--text-soft)}.help-intro-list li strong{color:var(--text-dark)}.help-feature-list{list-style:none;margin-bottom:2px}.help-feature-list li{padding:2px 0 2px 16px;position:relative;font-size:11px;color:var(--text-muted)}.help-feature-list li:before{content:"✓";position:absolute;left:0;font-size:9px;color:var(--text-soft);line-height:1.7}.help-feature-list.plus li:before{content:"+";color:var(--accent);font-weight:700}.help-feature-list.plus li{color:var(--text-dark)}.floating-actions{position:absolute;z-index:25;background:#0f172ac7;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1);border-radius:8px;display:flex;gap:0;padding:0;opacity:0;transition:opacity .18s;will-change:transform;box-shadow:0 8px 20px 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