body {
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    margin: 0;
    padding: 0;
}

.navbar {
    background: #2c3e50;
    padding: 15px;
}

.navbar a {
    color: white;
    margin-right: 20px;
    text-decoration: none;
    font-weight: bold;
}

.container {
    width: 80%;
    margin: 30px auto;
    background: white;
    padding: 25px;
    border-radius: 6px;
}

h2 {
    color: #2c3e50;
}

input, button, select {
    padding: 8px;
    margin: 5px 0;
    width: 100%;
}

button {
    background: #3498db;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #2980b9;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 10px;
    text-align: center;
}

.alert {
    color: red;
    font-weight: bold;
}