body {
    font-family: Arial, sans-serif;
    background: #f8f8f8;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 900px;
    margin: 30px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 24px;
}
h1 {
    text-align: center;
    color: #2a3f54;
}
.panel {
    margin-bottom: 24px;
    padding: 16px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    background: #fafbfc;
}
input[type="text"], input[type="number"] {
    margin: 4px 8px 4px 0;
    padding: 4px 8px;
    border: 1px solid #bbb;
    border-radius: 4px;
}
select {
    margin: 4px 8px 4px 0;
    padding: 4px 8px;
    border: 1px solid #bbb;
    border-radius: 4px;
}
button {
    margin: 6px 8px 6px 0;
    padding: 6px 16px;
    background: #2a3f54;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}
button:hover {
    background: #1a2736;
}
.error {
    color: #c00;
    font-weight: bold;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
th, td {
    border: 1px solid #ddd;
    padding: 6px 8px;
}
th {
    background: #f0f0f0;
}