.container {
            max-width: 600px;
            width: 100%;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            animation: fadeIn 0.5s ease-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .header {
            background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
            color: white;
            padding: 30px 20px;
            text-align: center;
        }
        
        .header h1 {
            font-size: 28px;
            margin-bottom: 10px;
        }
        
        .header p {
            font-size: 16px;
            opacity: 0.9;
        }
        
        .content {
            padding: 30px;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #444;
        }
        
        input[type="url"] {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e1e5ee;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
        }
        
        input[type="url"]:focus {
            border-color: #4b6cb7;
            box-shadow: 0 0 0 3px rgba(75, 108, 183, 0.2);
            outline: none;
        }
        
        .btn {
            display: inline-block;
            background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
            color: white;
            border: none;
            padding: 12px 25px;
            font-size: 16px;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
            text-decoration: none;
            text-align: center;
            width: 100%;
        }
        
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .btn:disabled {
            background: #cccccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .instructions {
            background: #f8f9fa;
            border-left: 4px solid #4b6cb7;
            padding: 15px;
            margin-top: 25px;
            border-radius: 0 8px 8px 0;
        }
        
        .instructions h3 {
            margin-bottom: 10px;
            color: #4b6cb7;
        }
        
        .instructions ol {
            padding-left: 20px;
        }
        
        .instructions li {
            margin-bottom: 8px;
        }
        
        .message {
            padding: 15px;
            border-radius: 8px;
            margin-top: 20px;
            animation: slideIn 0.3s ease-out;
        }
        
        @keyframes slideIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }
        
        .error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }
        
        .footer {
            text-align: center;
            padding: 20px;
            color: #666;
            font-size: 14px;
            border-top: 1px solid #eee;
        }
        
        .loading {
            display: none;
            text-align: center;
            padding: 10px;
            color: #4b6cb7;
        }
        
        .progress-bar {
            height: 4px;
            background: #e1e5ee;
            border-radius: 2px;
            margin-top: 10px;
            overflow: hidden;
        }
        
        .progress {
            height: 100%;
            background: #4b6cb7;
            width: 0%;
            transition: width 0.3s ease;
        }
        
        .url-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 10px;
        }
        
        .url-example {
            background: #f0f4ff;
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 12px;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .url-example:hover {
            background: #e1e8ff;
            transform: translateY(-2px);
        }
        
        @media (max-width: 480px) {
            .content {
                padding: 20px;
            }
            
            .header h1 {
                font-size: 24px;
            }
        }