body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
}

header {
    background: #2c3e50;
    color: white;
    padding: 20px;
    text-align: center;
}

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

main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 5px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th {
    background: #2c3e50;
    color: white;
    padding: 10px;
}

table td {
    padding: 10px;
    border-bottom: 1px solid #ddd;
}

.alert {
    padding: 10px;
    margin: 10px 0;
    border-radius: 3px;
}

.alert-success { background: #d4edda; color: #155724; }
.alert-danger { background: #f8d7da; color: #721c24; }
.alert-warning { background: #fff3cd; color: #856404; }
.alert-info { background: #d1ecf1; color: #0c5460; }

footer {
    text-align: center;
    padding: 20px;
    background: #2c3e50;
    color: white;
    margin-top: 20px;
}

input[type="text"], input[type="email"], input[type="password"] {
    padding: 8px;
    width: 300px;
    border: 1px solid #ddd;
    border-radius: 3px;
}

button {
    padding: 8px 20px;
    background: #2c3e50;
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}