.container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px 0;
            border-bottom: 1px solid #eaeaea;
        }
        
        h1 {
            color: #ff3b30;
            margin-bottom: 10px;
            font-size: 28px;
        }
        
        .subtitle {
            color: #666;
            font-size: 16px;
        }
        
        .input-section {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            margin-bottom: 30px;
        }
        
        .input-group {
            display: flex;
            gap: 10px;
        }
        
        input[type="text"] {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        input[type="text"]:focus {
            outline: none;
            border-color: #ff3b30;
        }
        
        button {
            background-color: #ff3b30;
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 500;
            transition: background-color 0.3s;
        }
        
        button:hover {
            background-color: #e0352b;
        }
        
        button:disabled {
            background-color: #cccccc;
            cursor: not-allowed;
        }
        
        .loading {
            display: none;
            text-align: center;
            margin: 20px 0;
        }
        
        .spinner {
            border: 4px solid rgba(0, 0, 0, 0.1);
            border-left-color: #ff3b30;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto 10px;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        .result-section {
            display: none;
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            margin-bottom: 30px;
        }
        
        .video-info {
            margin-bottom: 20px;
        }
        
        .video-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
            padding: 10px;
            background-color: #f9f9f9;
            border-radius: 6px;
        }
        
        .download-section {
            display: flex;
            gap: 15px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        
        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: #4CAF50;
            color: white;
            padding: 10px 20px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 500;
            transition: background-color 0.3s;
        }
        
        .download-btn:hover {
            background-color: #3d8b40;
        }
        
        .cover-download-btn {
            background-color: #2196F3;
        }
        
        .cover-download-btn:hover {
            background-color: #0b7dda;
        }
        
        .error-message {
            display: none;
            background-color: #ffebee;
            color: #c62828;
            padding: 15px;
            border-radius: 6px;
            margin: 20px 0;
            border-left: 4px solid #ff3b30;
        }
        
        .footer {
            text-align: center;
            margin-top: 40px;
            color: #888;
            font-size: 14px;
        }
        
        @media (max-width: 768px) {
            .input-group {
                flex-direction: column;
            }
            
            .download-section {
                flex-direction: column;
            }
        }