body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
.main-header { background: #fff; padding: 15px 30px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #ddd; }
.navbar ul { list-style: none; display: flex; gap: 20px; margin: 0; padding: 0; }
.navbar ul li a { text-decoration: none; color: #333; font-weight: bold; }
.logo img { height: 50px; }
.cart a { text-decoration: none; color: green; font-weight: bold; }
footer { background: #f1f1f1; padding: 20px; text-align: center; font-size: 14px; }
.course-card { border: 1px solid #ddd; padding: 10px; margin: 10px; width: 200px; display: inline-block; }
.btn { display: inline-block; margin-top: 10px; padding: 8px 16px; background: #007BFF; color: #fff; text-decoration: none; border-radius: 5px; }
.btn.green { background-color: #28a745; }