:root {
      --bg-dark: #0f172a; --bg-panel: #1e293b; --bg-input: #334155;
      --text-main: #f8fafc; --text-muted: #94a3b8; --accent: #3b82f6;
      --accent-hover: #2563eb; --border: #475569; --radius: 8px; --shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', system-ui, sans-serif; }
    body { background: var(--bg-dark); color: var(--text-main); height: 100vh; overflow: hidden; display: flex; flex-direction: column; }

    header { background: var(--bg-panel); padding: 12px 20px; display: flex; gap: 12px; align-items: center; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
    .btn { background: var(--bg-input); color: var(--text-main); border: 1px solid var(--border); padding: 8px 14px; border-radius: var(--radius); cursor: pointer; font-size: 13px; transition: 0.2s; white-space: nowrap; }
    .btn:hover { background: var(--accent); border-color: var(--accent); }
    .btn.primary { background: var(--accent); border-color: var(--accent); }
    .btn.primary:hover { background: var(--accent-hover); }
    .btn.danger { background: #ef4444; border-color: #ef4444; }
    .btn.danger:hover { background: #dc2626; }
    select, input[type="number"] { background: var(--bg-input); color: var(--text-main); border: 1px solid var(--border); padding: 8px; border-radius: var(--radius); font-size: 13px; }

    main { display: flex; flex: 1; overflow: hidden; }
    aside { width: 320px; background: var(--bg-panel); border-right: 1px solid var(--border); overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 16px; }
    .panel { background: rgba(255,255,255,0.03); padding: 12px; border-radius: var(--radius); border: 1px solid var(--border); display: none; }
    .panel.active { display: block; }
    .panel h3 { font-size: 13px; margin-bottom: 10px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
    .control-row { display: flex; gap: 8px; margin-bottom: 8px; align-items: center; }
    .control-row label { flex: 1; font-size: 12px; color: var(--text-muted); }
    .control-row input[type="range"] { flex: 1.5; accent-color: var(--accent); }
    .control-row input[type="color"] { width: 32px; height: 24px; border: none; background: none; cursor: pointer; }
    .control-row select { flex: 1; padding: 6px; }
    .btn-group { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
    .btn-sm { padding: 6px 10px; font-size: 11px; }
    .toggle { display: flex; align-items: center; gap: 8px; font-size: 12px; margin-bottom: 6px; cursor: pointer; }

    .canvas-wrapper { flex: 1; display: flex; align-items: center; justify-content: center; background: #0b1120; overflow: auto; padding: 20px; position: relative; }
    #canvas { background: linear-gradient(135deg, #1e293b, #0f172a); position: relative; overflow: hidden; box-shadow: var(--shadow); transition: width 0.3s, height 0.3s; background-size: cover; background-position: center; }
    #canvas img.bg-layer { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; pointer-events: none; }
    #canvas img.imported-img { position: absolute; cursor: move; user-select: none; z-index: 5; transition: box-shadow 0.2s, transform 0.2s; }
    #canvas img.imported-img.selected { outline: 2px dashed var(--accent); outline-offset: 4px; }
    .editable-text { position: absolute; cursor: move; user-select: none; min-width: 20px; padding: 4px 8px; z-index: 10; transition: box-shadow 0.2s; }
    .editable-text.selected { outline: 2px dashed var(--accent); outline-offset: 4px; }

    #crop-modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.85); z-index: 200; justify-content: center; align-items: center; flex-direction: column; }
    #crop-container { position: relative; max-width: 80vw; max-height: 80vh; border: 2px solid var(--accent); overflow: hidden; cursor: crosshair; }
    #crop-img { display: block; max-width: 100%; max-height: 100%; user-select: none; }
    #crop-selection { position: absolute; border: 2px dashed #fff; background: rgba(255,255,255,0.2); pointer-events: none; display: none; }
    .crop-actions { margin-top: 16px; display: flex; gap: 12px; }

    #file-input, #bg-file-input { display: none; }