body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}

header, footer {
    background: #007BFF;
    color: white;
    padding: 10px 0;
    text-align: center;
}

nav {
    background: #0056b3;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

.container {
    padding: 20px;
}

.course-card {
    border: 1px solid #ccc;
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin: 10px;
    display: inline-block;
    width: 30%;
    vertical-align: top;
    box-shadow: 2px 2px 5px #aaa;
}

input, select {
    padding: 10px;
    width: 100%;
    margin: 5px 0;
    border: 1px solid #999;
    border-radius: 4px;
}

button {
    background: #28a745;
    color: white;
    padding: 10px 20px;
    border: none;
    margin-top: 10px;
    cursor: pointer;
    border-radius: 5px;
}