.section-title {
            text-align: center;
            margin-bottom: 1.5rem;
            font-size: 1.25rem;
            font-weight: 600;
            margin-top: 1.5rem;
            margin-bottom: 1rem;
            color: #2d3748;
            text-align: center;
        }
        .selection-area {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .selection-box {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .selected-display {
            width: 150px;
            height: 150px;
            border: 2px dashed #cbd5e0;
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background-color: #f7fafc;
            margin-bottom: 1rem;
            padding: 0.5rem;
            text-align: center;
            cursor: pointer; /* クリック可能であることを示すカーソル */
            transition: background-color 0.3s ease;
        }
        .selected-display:hover {
            background-color: #e2e8f0; /* ホバー時の背景色 */
        }
        .selected-display img {
            width: 80px;
            height: 80px;
            object-fit: contain;
            margin-bottom: 0.5rem;
        }
        .selected-display span {
            font-weight: 500;
            color: #4a5568;
        }

        /* Popup Styles */
        .popup-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.6);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
        }
        .popup-content {
            background-color: white;
            padding: 2rem;
            border-radius: 12px;
            width: 90%;
            max-width: 700px;
            max-height: 80vh;
            display: flex;
            flex-direction: column;
        }
        #popup-title {
            text-align: center;
            margin-top: 0;
            margin-bottom: 1.5rem;
            color: #1a202c;
        }
        .popup-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
            gap: 1rem;
            overflow-y: auto;
            padding: 0.5rem;
            flex-grow: 1;
        }
        .popup-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 0.75rem;
            border-radius: 8px;
            border: 2px solid #e2e8f0;
            cursor: pointer;
            transition: all 0.2s ease-in-out;
            text-align: center;
            height: 120px;
        }
        .popup-item:hover {
            border-color: #a7d0fd;
            background-color: #f0f8ff;
        }
        .popup-item img {
            width: 60px;
            height: 60px;
            object-fit: contain;
            margin-bottom: 0.5rem;
        }
        .popup-item span {
            font-size: 0.875rem;
            color: #374151;
        }
        .popup-close-button {
            margin-top: 1.5rem;
            padding: 10px 20px;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            background-color: #f7fafc;
            cursor: pointer;
            font-size: 1rem;
            align-self: center;
        }

        /* Chart and Action Button Styles */
        .chart-container {
            position: relative;
            height: 400px;
            width: 100%;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid #e2e8f0;
        }
        .action-button-container {
            margin-top: 1.5rem;
            text-align: center;
        }
        .action-button {
            background-color: #10B981;
            color: white;
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }
        .action-button:hover {
            background-color: #059669;
        }
        .action-button:disabled {
            background-color: #cccccc;
            cursor: not-allowed;
        }