body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            display: flex;
        }
		
		textarea {
            width: 90%;
            height: 120px;
            padding: 15px;
            border: 1px solid #e9ecef;
            border-radius: 8px;
            background: #ffffff;
            color: #2c3e50;
            font-size: 16px;
            resize: vertical;
            margin-bottom: 15px;
            font-family: 'Consolas', monospace;
            line-height: 1.5;
        }

        textarea:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }

        .button-group {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
        }

        button {
            padding: 15px 25px;
            border: none;
            border-radius: 25px;
            background: linear-gradient(45deg, #3498db, #2ecc71);
            color: white;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
            min-width: 130px;
            
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
        }

        button:active {
            transform: translateY(0);
        }
		
		h2 {
				color: #555;
				margin-top: 30px;
				border-bottom: 1px solid #ccc;
				padding-bottom: 5px;
			}
			
        .sidebar {
            width: 150px;
            background-color: #f4f4f4;
            padding: 20px;
            box-shadow: 2px 0 5px rgba(0,0,0,0.1);
			/* overflow-y: auto;  Ìí¼Ó¹ö¶¯Ìõ */
            flex-shrink: 0;
        }
        .sidebar h2 {
            font-size: 18px;
            margin-bottom: 20px;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar ul li {
            margin-bottom: 10px;
        }
        .content {
            flex-grow: 1;
            padding: 20px;
        }
        .tool-section {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
        }
        .tool {
            background-color: #fff;
            border: 1px solid #ddd;
            border-radius: 5px;
            width: calc(18% - 20px);
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            padding: 15px;
            box-sizing: border-box;
            text-align: center;
        }
        .tool img {
            width: 50px;
            height: 50px;
            margin-bottom: 10px;
        }
        .tool h3 {
            font-size: 16px;
            margin: 10px 0;
        }
        .tool p {
            color: #666;
            font-size: 14px;
        }
		
	    .footer {
            background-color: #f4f4f4;
            padding: 20px;
            text-align: center;
            flex-shrink: 0;
        }