body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 800px;
    background: #fff;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-radius: 8px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

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

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #007bff;
    color: white;
}

tr:hover {
    background-color: #f1f1f1;
}

.level {
    font-weight: bold;
    color: #e74c3c;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.footer {
    text-align: center;
    font-size: 0.9em;
    color: #666;
    margin-top: 20px;
}