*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.container{max-width:1200px;margin:0 auto;padding:20px}h1{text-align:center;margin-bottom:40px;color:#333}.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}.course-card{border:1px solid #ddd;border-radius:8px;padding:20px;background:#f9f9f9;box-shadow:0 2px 4px #0000001a}.course-card h2{color:#333;margin-bottom:10px}.course-card p{color:#666;line-height:1.6}.error{color:#d32f2f;text-align:center;padding:20px;background:#ffebee;border-radius:4px}