:root {
    --sys-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Droid Sans", "Helvetica Neue";
    --zh-font-family: "PingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei";
    --base-font-family: "Inter", var(--sys-font-family), var(--zh-font-family), sans-serif;
}

body {
    padding: 0;
    margin: 0;
    background: #202020;
    font-family: var(--base-font-family);
}

header {
    background: #2B2D30;
    color: #909391;
}

main {
    background: #202020;
    margin: 1% auto;
    display: flex;
}

footer {
    padding: .5% 0;
    text-align: center;
    color: #909391;
    margin: 0 auto;
}

/* 网站标题 */
.title {
    font-weight: bold;
    color: #909391;
}

/* 描述 */
.description {
    margin-left: 10px;
    color: #909391;
}

.left-container {
    padding: 10px;
    background: #2B2D30;
    text-align: center;
    border-radius: 5px;
}

.center-container {
    margin-left: 10px;
    padding: 10px;
    background: #2B2D30;
    text-align: center;
    border-radius: 5px;
}

.tab-button {
    width: 100%;
    background: transparent;
    padding: 10px;
    list-style: none;
    color: #A9B7C6;
    border: none;
    font-size: medium;
    border-radius: 5px;
    font-family: var(--base-font-family);
}

.tab-button-selected {
    width: 100%;
    background: #202020;
    padding: 10px;
    list-style: none;
    color: #A9B7C6;
    border: none;
    font-size: medium;
    border-radius: 5px;
    font-family: var(--base-font-family);
    font-weight: bold;
}

.tab-button:hover {
    color: #EEEEEE;
    font-weight: bold;
}

.right-container {
    margin-left: 10px;
    background: #2B2D30;
    border-radius: 5px;
}

.content-container {
    /*display: none;*/
    padding: 10px;
    margin: 0;
}

.content-item {
    list-style: none;
    padding: 10px;
    margin: 0;
}

.content_item_url {
    text-decoration: none;
    color: #A9B7C6;
    margin-left: 10px;
}

.content_item_url:hover {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.content_item_des {
    margin-left: 1%;
    color: #A9B7C6;
    border: #A9B7C6 solid 1px;
    border-radius: 5px;
    font-size: xx-small;
    padding: 5px;
}