/* clear */
* {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
    margin: 0;
}

img {
    vertical-align: top; /* 设置图片在垂直方向上的对齐方式 */
}

a {
    text-decoration: none; /* 去除默认下划线 */
    outline: none; /* 去除旧版浏览器点击后的虚线框 */
    color: #000; /* 去除点击前后的颜色变化 */
}
/*colors*/
:root {
    --selection-background: #eeeeee;
    --focus-outline: #5689df;
    --text-color: #000000;
    --link-underline-normal: #eeeeee;
    --link-underline-hover: #222222;
    --page-headline: #777777;
    --page-catalog: #222222;
    --img-background: #f8f8f8;
    --page-hr: #f8f8f8;
    --page-blockquote: #222222;
    --table-border: #eeeeee;
}

/* selection */
::selection {
    background-color:var(--selection-background);
}
::-moz-selection {
    background-color: var(--selection-background);
}

/*tabindex*/
a {
    border-bottom: 2px solid var(--link-underline-normal);
    cursor: pointer;
}
    a:focus {
        outline: 2px solid var(--focus-outline);
    }
    a:hover {
        border-color:var(--link-underline-hover);
    }

/*container*/
.container {
    padding:56px 6%;
    padding-bottom:24px;
}
@media screen and (min-width:768px) {
    .container {
        padding: 56px 12%;
        padding-bottom: 24px;
    }
}
/*back-to-index*/
.back-to-index {
    margin-bottom:80px;
}
/*page-heading*/
.page-heading {
    margin-bottom:16px;
}
/*page-headline*/
.page-headline {
    color:var(--page-headline);
    padding-bottom:24px;
}
    .page-headline ul {
        display:block;
    }
    .page-headline li {
        float:left;
        padding-right:24px;
        padding-bottom:8px;
    }
    .page-headline img {
        height:16px;
        padding:4px;
        float:left;
        margin:auto;
    }
    .page-headline div {
        height:24px;
        float:left;
        text-align:center;
        line-height:24px;
        
    }
/*page-header*/
.page-header {
    margin-bottom:64px;
}
/*section grid*/
.page-grid-1-column {
    margin-bottom:56px;
}
.page-grid-2-column {
    display: grid;
    grid-template-columns: repeat(2,1fr);
    grid-gap: 32px;
    margin-bottom: 24px;
}
@media screen and (max-width:768px) {
    .page-grid-2-column {
        display: grid;
        grid-template-columns: repeat(1,1fr);
    }
}
/*read-book-cover*/
.read-book-cover {
    background-color:var(--img-background);
    display:flex;
    justify-content:center;
    overflow:hidden;
    width:100%;
    max-height:360px;
}
    .read-book-cover img {
        width: auto;
        height:100%;
        max-width:400px;
        display: block;
        overflow: clip;
    }
/*read-book-intro*/
.read-book-intro {
    margin: auto 0;
    overflow: hidden;
    max-height: 360px;
}
    .read-book-intro p {
        margin-bottom: 16px;
        line-height: 1.6rem;
        font-size: 16px;
        color: var(--text-color);
    }
/*page-h1*/
h1 {
    padding:0;
    margin:0;
    font-size:48px;
}
/*page-h2*/
h2 {
    padding-top:16px;
    margin-bottom:24px;
    font-size:32px;
}
    h2 a {
        opacity:0;
        font-size:24px;
        padding:0 4px;
        margin:0 8px;
    }
        h2 a:hover{
            opacity: 1;
        }
        h2 a:focus {
            opacity: 1;
        }
/*page-h3*/
h3 {
    padding-top:16px;
    margin:0 0 16px 0;
    font-size:22px;
}
/*page-h4*/
h4 {
    padding-top: 16px;
    margin-bottom: 8px;
    font-size:18px;
}
/*text-content*/
p {
    margin-bottom: 16px;
    line-height: 1.8rem;
    font-size: 16px;
    color: var(--text-color);
    width: 100%;
    max-width: 760px;
}
/*page-hr*/
.page-hr {
    height: 1px;
    border: none;
    background-color:var(--page-hr);
    margin: 32px 0 32px 0;
}
/*page-main*/
.page-main {
    margin-bottom: 64px;
}
/*page-footer*/
.page-footer {
    margin:0;
}
    .page-footer p {
        font-size:12px;
    }
/*page-pagination*/
.page-pagination {
    padding-bottom:32px;
    margin-bottom:64px;
}
/*page-catalog*/
.page-catalog {
    margin-bottom: 24px;
}
    .page-catalog li {
        padding: 8px 0;
        line-height: 24px;
    }
    .page-catalog img {
        height: 16px;
        padding: 4px;
        float: inline-start;
        margin: auto;
    }
    .page-catalog a {
        color: var(--page-catalog);
        line-height: 24px;
        display:inline-block;
    }
/*blockquote*/
.page-blockquote {
    border-left: 3px solid var(--page-blockquote);
    padding-left: 40px;
    margin-bottom: 24px;
    max-width: 760px;
}
/*text-description*/
.text-description li{
    margin-bottom:16px;
}
/*page-ul-list*/
.page-ul-list {
    margin-bottom:24px;
}
    .page-ul-list li{
        list-style-type:disc;
        margin-left:40px;
        line-height:24px;
        padding-bottom:16px;
    }
/*page-ol-list*/
.page-ol-list {
    margin-bottom: 24px;
}
    .page-ol-list li {
        list-style-type: decimal;
        margin-left: 40px;
        line-height: 24px;
        padding-bottom: 16px;
    }
/*page-table*/
.page-table {
    border-collapse: collapse;
    border-spacing: 0;
    width: 100%;
    margin-bottom:40px;
}
    .page-table tr{
        border-bottom:1px solid var(--table-border);
    }
    .page-table th {
        padding:10px 16px;
        text-align:left;
        font-size:14px;
        line-height:24px;
        color:var(--text-color);
    }
    .page-table td {
        padding: 10px 16px;
        text-align: left;
        font-size: 14px;
        line-height: 22px;
        color: var(--text-color);
    }
/*page-reference-list*/
.page-reference-list {
    margin-bottom: 24px;
}
    .page-reference-list li {
        line-height: 24px;
        padding-bottom: 16px;
    }
    .page-reference-list img {
        height: 16px;
        padding: 4px;
        float: inline-end;
        margin: auto;
    }
    .page-reference-list a {
        line-height:24px;
        display:inline-block;
    }