.is-loading.book::before {
    opacity: 0.7;
    pointer-events: auto;
}
.book::before {
    transition: all 500ms;
    content: '加载中...';
    display: flex;
    position: absolute;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
    background-color: #fff;
    color: #fff;
    z-index: 999;
    cursor: progress;
    opacity: 0;
    pointer-events: none;
}
html, html body, div.book.font-family-1 {
}
div.book.font-family-0 {
}
.markdown-section h1, .markdown-section h2, .markdown-section h3, .markdown-section h4, .markdown-section h5, .markdown-section h6, .markdown-section b, .markdown-section strong {
    font-weight: 600;
}
.book .book-summary .exc-trigger {
    color: #ddd;
}
.book-summary ul.summary li a, .book-summary ul.summary li span{
    white-space: inherit;
}
video {
    width: 100%;
    border: 1px solid #DCDEE0;
}
.book-header{
    background: white;
    position: fixed;
    width: 100%;
    border-bottom: 1px solid #eee;
    transform: translate3d(0, 0, 0);
    top: 0;
    z-index: 9000;
}
.page-wrapper {
    padding: 50px 15px 40px 15px;
}
.navigation-prev, .navigation-next {
    display: none;
}

@media (min-width:600px) {
    .markdown-section .doc-pc-50 {
        width: 49%;
        min-width: 300px;
        vertical-align: top;
    }
}