body {
      font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
      background-color: #f8f8f8;
      margin: 0;
      padding: 0;
}
nav {
    background-color: #053a0fd0;
    padding: 5px;
    color: white;
}
nav .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
nav a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
    font-size: 1.5rem;
    font-weight: 200;
}
nav a:hover {
    text-decoration: underline;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
.course-content {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}
.course-image {
    flex: 1 1 50%;
    min-width: 300px;
}
.course-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.course-details {
    flex: 1 1 50%;
    min-width: 300px;
}
.course-details h1 {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 15px;
}
.course-details p {
    color: #444;
    margin-bottom: 20px;
}
.progress-section {
    margin-bottom: 20px;
}
.progress-section h3 {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
}
.progress-bar-container {
    width: 100%;
    background-color: #ddd;
    border-radius: 10px;
    height: 20px;
    overflow: hidden;
}
.progress-bar {
    width: 0%;
    height: 100%;
    background-color: #1e90ff;
    transition: width 0.3s ease-in-out;
}
.progress-text {
    font-size: 14px;
    color: #666;
    margin-top: 5px;
}
.collapse-section {
    margin-bottom: 10px;
}
.collapse-button {
    width: 100%;
    background-color: #1e90ff;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 8px;
    text-align: left;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.collapse-button:hover {
    background-color: #187bcd;
}
.collapse-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background-color: white;
    padding: 0 15px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.collapse-content.active {
    max-height: 500px; /* Adjust based on content */
    padding: 15px;
}
.complete-btn {
    margin-top: 10px;
    background-color: #28a745;
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.complete-btn:hover {
    background-color: #218838;
}
.complete-btn:disabled {
    background-color: #aaa;
    cursor: not-allowed;
}
@media (max-width: 768px) {
    .course-content {
    flex-direction: column;
    }
}