body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 1100px;
    margin: auto;
    overflow: auto;
    padding: 0 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    padding: 20px;
}
header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    margin-bottom: 20px;
}
header h1 {
    margin: 0;
}
nav a {
    color: #fff;
    text-decoration: none;
    padding: 0 15px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}
th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}
th {
    background-color: #f2f2f2;
}
.btn {
    display: inline-block;
    background: #5cb85c;
    color: #fff;
    padding: 8px 20px;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    cursor: pointer;
}
.btn-edit {
    background: #f0ad4e;
}
.btn-delete {
    background: #d9534f;
}
.form-group {
    margin-bottom: 15px;
}
.form-group label {
    display: block;
    margin-bottom: 5px;
}
.form-group input, .form-group select {
    width: 100%;
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ccc;
}