:root {
            --bg-color: #2A2A2A;      
            --panel-bg: #3C3C3C;    
            --sub-bg: #0E2426;      
            --text-color: #EAEAEA;
            --accent-red: #E74C3C;  
            --accent-blue: #3498db;
            --accent-gold: #f1c40f;
        }

        body {
            background: var(--bg-color);
            color: var(--text-color);
            margin: 0; padding: 10px;
            font-family: 'Helvetica Neue', Arial, sans-serif;
        }

        #gimp-panel {
            background: var(--panel-bg);
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
            border: 1px solid #444;
            max-width: 500px;
        }

        h2 { color: var(--accent-red); font-size: 1.2em; letter-spacing: 1px; margin-top: 0; text-align: center; }
        h3 { font-size: 0.9em; margin: 10px 0 5px 0; border-bottom: 1px solid #555; padding-bottom: 3px; color: #bbb; }
        
        .control-grid { display: grid; grid-template-columns: 1fr; gap: 10px; }

        .gimp-btn {
            width: 100%;
            padding: 10px;
            font-size: 14px;
            font-weight: bold;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            text-align: left;
            display: flex;
            align-items: center;
            gap: 10px;
            background: var(--sub-bg);
            border-left: 4px solid #646464;
            transition: all 0.2s;
        }

        .btn-row { display: flex; gap: 10px; }

        /* ボタン個別の色設定 */
        .btn-ai { border-left-color: var(--accent-red); background: #2c0b08; }
        .btn-mask { border-left-color: #f39c12; background: #2e1d05; }
        .btn-ai-erase { border-left-color: var(--accent-gold); background: #533709; }
        .btn-ai-sharp { border-left-color: var(--accent-gold); background: #2d2a0a; }
        .btn-fix { border-left-color: #9b59b6; background: #26152d; }
        .btn-batch { border-left-color: var(--accent-blue); background: #1a2a3a; }
        
        .gimp-btn:hover:not(:disabled) { transform: translateX(3px); filter: brightness(1.3); }
        .gimp-btn:disabled { opacity: 0.5; cursor: not-allowed; }

        /* 入力フォームスタイル */
        .input-group { background: #1a1a1a; padding: 10px; border-radius: 8px; margin-bottom: 10px; }
        .input-row { display: flex; align-items: center; gap: 10px; margin-bottom: 5px; font-size: 12px; }
        .input-row input { background: #333; border: 1px solid #555; color: white; padding: 5px; border-radius: 4px; width: 60px; }
        .input-row select { background: #333; border: 1px solid #555; color: white; padding: 4px; border-radius: 4px; }

        /* バッチ用チェックボックス */
        .batch-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; font-size: 11px; margin-bottom: 10px; }
        .batch-item { display: flex; align-items: center; gap: 5px; cursor: pointer; }

        hr { border: 0; border-top: 1px solid #555; margin: 12px 0; }
        .ad-vertical-box { width: 200px; height: 800px; background: #1a1a1a; border-radius: 8px; border: 1px solid #444; display: flex; flex-direction: column; align-items: center; justify-content: space-around; }