body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    color: white;
    padding: 10px 0;
    text-align: center;
}

nav {
    margin: 10px 0;
}

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

ul.tabs li {
    padding: 10px 20px;
    cursor: pointer;
}

ul.tabs li.active {
    background: #555;
}

.wallpaper-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    margin: 20px;
}

.wallpaper {
    flex: 0 1 calc(50% - 20px); /* 2张图片一行，留出一些空隙 */
    margin: 10px;
    cursor: pointer;
}

.wallpaper img {
    width: 100%;
    height: auto;
    border-radius: 5px;
}

.qhdyj{
    display:none;
}

footer {
    display: flex;
    flex-direction: column;
    align-items: center; /* Center align all child elements horizontally */
    background: #333;
    color: white;
    padding: 20px;
}

.footer-item {
    display: flex;
    justify-content: left;
    margin: 10px 0;
}

.footer-label {
    min-width: 100px;
    font-weight: bold;
}

.footer-content {
    flex-grow: 1;
}

.big-button {
    background: #007BFF;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    margin-bottom: 20px;
    transition: background 0.3s ease;
    text-align: center;
}

.big-button:hover {
    background: #0056b3;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.9);
}

.modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}

.button-link {
    color: white;
    text-decoration: none;
    display: block;
    text-align: center;
}