body {
    font-family: 'Roboto', sans-serif;
    background-color: #f0f2f5;
    color: #333;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}

h1 {
    color: #444;
}

form {
    margin-bottom: 20px;
}

input[type="text"] {
    padding: 10px;
    width: 70%;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

.icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    justify-items: center;
}

.icon-grid div {
    flex: 1 1 calc(25% - 20px);
    text-align: center;
}

.icon-grid img {
    max-width: 120px;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.icon-grid img:hover {
    transform: scale(1.1);
}
/* 返回顶部按钮 */
#back-to-top {
    position: fixed;
    bottom: 40px;
    right: 20px;
    display: none;
    width: 50px;
    height: 50px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease;
}

#back-to-top:hover {
    background-color: #0056b3;
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: white;
    padding: 20px 0;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-content p {
    font-size: 18px;
    margin-bottom: 10px;
}

.footer-content ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

.footer-content ul li {
    margin: 0 15px;
}

.footer-content ul li a {
    color: white;
    text-decoration: none;
}

.footer-content ul li a:hover {
    text-decoration: underline;
}