body {
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    margin: 0;
    padding: 0;
}
.header {
    background: #2c3e50;
    color: white;
    padding: 15px;
    display: flex;
    justify-content: space-between;
}
.main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 15px;
}
.section {
    background: white;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.menu {
    list-style: none;
    padding: 0;
    margin: 0;
    background: #34495e;
    display: flex;
}
.menu li {
    margin: 0;
}
.menu a {
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    display: block;
}
input, button, select {
    padding: 8px;
    margin: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}
th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #eee;
}
th {
    background: #3498db;
    color: white;
}