.container {
            width: 100%;
            max-width: 800px;
            background-color: rgba(255, 255, 255, 0.95);
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            padding: 30px;
            margin-top: 40px;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        h1 {
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 2.2rem;
        }
        
        .subtitle {
            color: #7f8c8d;
            font-size: 1.1rem;
        }
        
        .input-section, .output-section {
            margin-bottom: 25px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        
        textarea {
            width: 100%;
            height: 150px;
            padding: 15px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            resize: vertical;
            transition: border-color 0.3s;
        }
        
        textarea:focus {
            outline: none;
            border-color: #3498db;
        }
        
        .output-box {
            background-color: #f8f9fa;
            border: 2px solid #e9ecef;
            border-radius: 10px;
            padding: 15px;
            min-height: 150px;
            font-size: 18px;
            line-height: 1.6;
            color: #2c3e50;
            word-break: break-all;
        }
        
        .button-group {
            display: flex;
            justify-content: space-between;
            gap: 15px;
            margin-top: 20px;
        }
        
        button {
            flex: 1;
            padding: 14px;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        #convertBtn {
            background: linear-gradient(to right, #3498db, #2c3e50);
            color: white;
        }
        
        #convertBtn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        #clearBtn {
            background-color: #e74c3c;
            color: white;
        }
        
        #clearBtn:hover {
            background-color: #c0392b;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .loading {
            display: none;
            text-align: center;
            margin: 20px 0;
        }
        
        .spinner {
            border: 5px solid #f3f3f3;
            border-top: 5px solid #3498db;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .error {
            color: #e74c3c;
            background-color: #fadbd8;
            padding: 10px;
            border-radius: 5px;
            margin-top: 10px;
            display: none;
        }
        
        .success {
            color: #27ae60;
            background-color: #d5f4e6;
            padding: 10px;
            border-radius: 5px;
            margin-top: 10px;
            display: none;
        }
        
        .info {
            color: #3498db;
            background-color: #d6eaf8;
            padding: 10px;
            border-radius: 5px;
            margin-top: 10px;
            display: none;
        }
        
        footer {
            margin-top: 30px;
            text-align: center;
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.9rem;
        }
        
        .example-text {
            font-size: 0.9rem;
            color: #7f8c8d;
            margin-top: 5px;
            cursor: pointer;
            text-decoration: underline;
        }
        
        .options {
            display: flex;
            gap: 15px;
            margin-bottom: 15px;
        }
        
        .option-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        @media (max-width: 600px) {
            .container {
                padding: 20px;
            }
            
            h1 {
                font-size: 1.8rem;
            }
            
            .button-group {
                flex-direction: column;
            }
            
            .options {
                flex-direction: column;
                gap: 10px;
            }
        }