body {
font-family: Arial, sans-serif;
line-height: 1.6;
margin: 0;
padding: 20px;
background-color: #f4f4f4;
}

.container {
width: 80%;
margin: auto;
background: #fff;
padding: 20px;
border-radius: 5px;
box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h2, h3 {
color: #333;
}

nav {
background: #333;
padding: 10px 0;
margin-bottom: 20px;
}

nav a {
color: white;
text-decoration: none;
padding: 10px 15px;
}

nav a:hover {
background: #555;
}

form {
display: flex;
flex-direction: column;
gap: 10px;
max-width: 400px;
margin: 20px 0;
}

form input, form select, form textarea {
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
}

form input[type="submit"] {
background: #333;
color: white;
cursor: pointer;
border: none;
}

form input[type="submit"]:hover {
background: #555;
}

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

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

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

th {
background-color: #333;
color: white;
}

tr:nth-child(even) {
background-color: #f2f2f2;
}

.error {
color: red;
}

.success {
color: green;
}