body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
    background-color: #f7f8fa;
    color: #333;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 20px;
}
header {
    text-align: center;
    background-color: #004d99;
    color: white;
    padding: 30px 20px;
    border-radius: 6px;
}
h1 {
    margin-bottom: 5px;
}
h2 {
    margin-top: 30px;
    color: #004d99;
}
.tool-list {
    list-style: none;
    padding: 0;
}
.tool-list li {
    background-color: #fff;
    margin: 10px 0;
    padding: 15px 20px;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}
.tool-list li:hover {
    transform: scale(1.02);
}
.tool-list a {
    color: #004d99;
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
}
footer {
    margin-top: 40px;
    text-align: center;
    font-size: 14px;
    color: #888;
}