body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #f3ec78, #af4261);
    color: #333;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 800px;
    margin: 50px auto;
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
h1 {
    text-align: center;
    color: #af4261;
}
ul {
    list-style-type: none;
    padding: 0;
}
li {
    margin: 10px 0;
}
a {
    text-decoration: none;
    color: #0066cc;
    font-weight: bold;
}
a:hover {
    color: #004080;
}
.video-container {
    position: relative;
    padding-bottom: 56.25%; /* Aspect ratio 16:9 */
    height: 0;
    overflow: hidden;
}
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}
        .section {
            margin: 20px 0;
            padding: 20px;
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
        }

        .btn-download, .btn-marks {
            margin: 5px 0;
        }

        .btn-marks {
            margin-top: 20px;
        }
        
        .disabled-link {
            pointer-events: none;
            opacity: 0.5;
            text-decoration: none;
            
        }
        
        /* Modal styles */
        .modal {
            display: none; /* Hidden by default */
            position: fixed; /* Stay in place */
            z-index: 1; /* Sit on top */
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.4); /* Black background with transparency */
        }

        .modal-content {
            background-color: yellow; /* Yellow background */
            margin: 10% auto; /* Position the modal in the middle */
            padding: 40px;
            border-radius: 8px;
            width: 80%; /* Responsive width */
            max-width: 600px;
            text-align: center;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); /* Add shadow effect */
            animation: slideIn 0.5s ease-out; /* Add slide-in animation */
        }

        /* Animation for the modal */
        @keyframes slideIn {
            0% {
                transform: translateY(-50px);
                opacity: 0;
            }
            100% {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
        }

        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
        }

        /* Mobile responsiveness */
        @media (max-width: 768px) {
            .modal-content {
                width: 90%; /* Make the modal content take 90% of screen width on smaller devices */
                padding: 20px; /* Reduce padding for mobile */
            }

            .close {
                font-size: 24px; /* Smaller close button on mobile */
            }
        }