:root{color-scheme:dark;font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5;--sidebar-width: 240px;--header-height: 56px;--bg-dark: #0f0f13;--bg-panel: #16161d;--bg-card: #1e1e28;--border: rgba(255, 255, 255, .08);--text: #e4e4e7;--text-dim: #8b8b95;--accent: #7c5cfc;--accent-hover: #9171ff;--danger: #ef4444}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:var(--bg-dark);color:var(--text);overflow:hidden}#root{display:flex;flex-direction:column;height:100vh}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.app-header{height:var(--header-height);background:var(--bg-panel);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 1rem;flex-shrink:0;z-index:10}.header-left{display:flex;align-items:center;gap:1rem}.header-left h1{font-size:1.1rem;font-weight:700;letter-spacing:-.02em;display:flex;align-items:center;gap:.5rem}.logo-icon{font-size:1.3rem}.current-scene-badge{font-size:.75rem;padding:.2rem .6rem;background:#7c5cfc26;border:1px solid rgba(124,92,252,.3);border-radius:999px;color:var(--accent-hover);font-weight:500}.header-right{display:flex;gap:.5rem}.btn{padding:.4rem .8rem;border-radius:6px;border:1px solid var(--border);background:var(--bg-card);color:var(--text);font-size:.8rem;cursor:pointer;transition:all 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#ffffff0d}.scene-bg{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none}.canvas-hint{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;pointer-events:none}.canvas-hint p{font-size:1rem;color:#ffffff4d;text-shadow:0 2px 8px rgba(0,0,0,.3);font-weight:500}.draggable-element{position:absolute;-webkit-user-select:none;user-select:none;z-index:5;transition:filter .15s}.draggable-element:hover{filter:brightness(1.2)}.draggable-element.selected{outline:2px solid var(--accent);outline-offset:4px;border-radius:4px;z-index:10}.delete-btn{position:absolute;top:-10px;right:-10px;width:22px;height:22px;border-radius:50%;background:var(--danger);color:#fff;border:2px solid var(--bg-dark);font-size:14px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:20;padding:0;transition:transform 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