/* style.css */
body {
    font: 14px Arial, SimSun, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

h1, h2, h3 {
    color: #333;
}

.txt {
    width: 100%;
    padding: 8px;
    margin: 5px 0;
    border: 1px solid #ccc;
    border-radius: 3px;
    font: 14px Arial, SimSun;
}

.btn {
    background: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 14px;
}

.btn:hover {
    background: #45a049;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 10px 0;
}

table, th, td {
    border: 1px solid #aaa;
}

th, td {
    padding: 8px;
    text-align: center;
}

th {
    background: #f0f0f0;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.error {
    color: red;
    font-weight: bold;
}

.success {
    color: green;
}