#footer {
    margin-top: 20px;
    background: #1a1a1a;
    padding: 5px;
    text-align: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}

body {
    font-family: Arial, "Microsoft YaHei", sans-serif;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}


h1 {
    text-align: center;
    margin-bottom: 30px;
    margin-top: auto;
    color: #ffffff;
}

h2 {
    color: #ffffff;
    margin-top: auto;
    margin-bottom: 15px;
}

h3 {
    color: #ffffff;
    margin-bottom: 5px;
    margin-top: 4px;
}


a:hover {
    color: #ffffff;
}

a {
    text-decoration: none;
    color: #cccccc;
    transition: color 0.3s;
}

p {
    color: #cccccc;
    line-height: 1.6;
    margin: auto;
}

button {
    text-decoration: none;
    color: #cccccc;
    transition: color 0.3s;
    cursor: pointer;
    display: inline-block;
    background-color: #00000000;
    border: none;
}

.content-wrapper {
    flex: 1;
    padding: 20px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.content-linkbox {
    background: #1a1a1a;
    padding: 20px;
    margin-left: 10px;
    margin-right: 10px;
    border-radius: 8px;
    margin-bottom: 20px;
    transition: background-color 0.3s, box-shadow 0.3s;
    display: inline-block;
}

.content-linksbox {
    background: #1a1a1a79;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    margin-top: 20px;
    text-align: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.content-intro {
    background: #1a1a1a79;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    margin-top: 20px;
    text-align: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}


img {
    display: block;
    margin: 0 auto;
}

.center {
    text-align: center;
}

.a-use {
    color: #cccccc;
    text-decoration:underline dashed #cccccc 3px;
    text-decoration-thickness: 1.2px;
    text-underline-offset: 2px;
    transition: color 0.3s;
}

.a-use:hover {
    color: #ffffff;
}

#language-switch {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: #1a1a1a;
    color: #cccccc;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

#language-switch:hover {
    background-color: #333333;
    color: #ffffff;
}

#expandButton {
    background-color: #1a1a1a;
    color: #cccccc;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

#expandButton:hover {
    background-color: #333333;
    color: #ffffff;
}
.content-intro-div {
    color:#cccccc;
    line-height: 1.5;
}