.container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            overflow: hidden;
        }
        
        header {
            background: linear-gradient(to right, #2c3e50, #4a6491);
            color: white;
            padding: 25px;
            text-align: center;
            border-bottom: 5px solid #fdbb2d;
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        
        .subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        
        .main-content {
            display: flex;
            flex-wrap: wrap;
            padding: 20px;
        }
        
        .input-section, .output-section {
            flex: 1;
            min-width: 300px;
            padding: 20px;
        }
        
        .controls {
            flex-basis: 100%;
            padding: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
            background-color: #f8f9fa;
            border-radius: 10px;
            margin: 10px 0;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        .control-group {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }
        
        .btn {
            padding: 12px 25px;
            border: none;
            border-radius: 50px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .btn-primary {
            background: linear-gradient(to right, #3498db, #2980b9);
            color: white;
        }
        
        .btn-success {
            background: linear-gradient(to right, #2ecc71, #27ae60);
            color: white;
        }
        
        .btn-warning {
            background: linear-gradient(to right, #f39c12, #e67e22);
            color: white;
        }
        
        .btn-danger {
            background: linear-gradient(to right, #e74c3c, #c0392b);
            color: white;
        }
        
        .btn-info {
            background: linear-gradient(to right, #1abc9c, #16a085);
            color: white;
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .btn:active {
            transform: translateY(1px);
        }
        
        textarea {
            width: 100%;
            height: 300px;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            font-size: 14px;
            resize: vertical;
            transition: border-color 0.3s;
        }
        
        textarea:focus {
            border-color: #3498db;
            outline: none;
        }
        
        .section-title {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: #2c3e50;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .section-title i {
            color: #3498db;
        }
        
        .stats {
            display: flex;
            justify-content: space-between;
            margin-top: 10px;
            font-size: 0.9rem;
            color: #7f8c8d;
        }
        
        .copy-btn {
            background: #95a5a6;
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s;
            margin-top: 10px;
        }
        
        .copy-btn:hover {
            background: #7f8c8d;
        }
        
        footer {
            text-align: center;
            padding: 20px;
            color: #7f8c8d;
            font-size: 0.9rem;
            border-top: 1px solid #eee;
        }
        
        @media (max-width: 768px) {
            .main-content {
                flex-direction: column;
            }
            
            .input-section, .output-section {
                width: 100%;
            }
        }
        
        .icon {
            display: inline-block;
            width: 24px;
            height: 24px;
            background-size: contain;
            background-repeat: no-repeat;
        }