body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
}
.container {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1, h2 {
    color: #333;
}
.error {
    color: red;
    font-weight: bold;
}
.success {
    color: green;
    font-weight: bold;
}
form {
    background-color: #f9f9f9;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 5px;
}
input[type="text"], input[type="email"], input[type="password"], input[type="number"], select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
input[type="submit"], .btn {
    background-color: #333;
    color: #fff;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
}
input[type="submit"]:hover, .btn:hover {
    background-color: #555;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}
th, td {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: left;
}
th {
    background-color: #f2f2f2;
}
.action-links a {
    margin-right: 10px;
    color: #333;
    text-decoration: none;
}
.action-links a:hover {
    text-decoration: underline;
}