div.book div.book_container {
    width: 60%;
    margin-left: 20%;
    padding-bottom: 166px;
}

div.book div.book_top_part {
    display: flex;
    flex-direction: row;
    align-items: start;
    margin-left: 2vw;
}

div.book img.book_cover {
    width: 16vw;
    flex-shrink: 0;
}

div.book div.book_information {
    margin-left: 1.4vw;
}

div.book div.book_information div.book_title {
    font-size: 1.7vw;
    font-weight: bold;
    margin-top: 1.3vw;
}

div.book div.book_information div.book_description {
    color: gray;
    font-size: 1vw;
    margin-top: 6px;
}

div.book div.book_information div.book_articles_count {
    color: gray;
    font-size: 1vw;
}

div.book div.change_book_mode {
    font-size: 1vw;
    margin-top: 12px;
    display: flex;
    align-items: center;
    user-select: none;
    cursor: pointer;
}

div.book div.change_book_mode img {
    width: 13px;
}

div.book div.change_book_mode div {
    margin-left: 4px;
}

div.book div.book_articles {
    margin-left: 1.5vw;
}

/*图文模式*/
div.book div.book_article_with_picture {
    width: 52vw;
    background: white;
    border-radius: 6px;
    box-shadow: 0px 1px 5px 2px #ddd;
    overflow: hidden;
    margin-top: 6vh;
    cursor: pointer;
}

div.book div.book_article_with_picture:first-child {
    margin-top: 2vh;
}

div.book div.book_article_with_picture img {
    width: 100%;
    height: 12vw;
    object-fit: cover;
}

div.book div.book_article_with_picture div.article_title_with_picture {
    font-size: 1.4vw;
    font-weight: bold;
    margin-left: 10px;
    margin-right: 10px;
    margin-top: 5px;
}

div.book div.book_article_with_picture div.article_introduction {
    font-size: 1vw;
    margin: 3px 10px 10px;
    color: gray;
}

/*列表模式*/
div.book div.book_articles_with_list {
    margin-top: 6px;
    padding-left: 24px;
    padding-right: 24px;
    background: #f9f9f9cc;
}

div.book div.book_article_with_list {
    display: flex;
    align-items: flex-start;
    border-top: 1px #eee solid;
    padding: 16px 0;
    font-size: 1.2vw;
    cursor: pointer;
}

div.book div.book_article_with_list:first-child {
    border-top: none;
}

div.book div.book_article_with_list div.title {
    margin-left: 0.5em;
}

div.book div.none_articles_tip {
    color: grey;
    font-size: 1vw;
    text-align: center;
    margin-top: 1vh;
}

@media screen and (max-width: 768px) {
    div.book div.book_container {
        width: 70%;
        margin-left: 15%;
    }

    div.book img.book_cover {
        width: 17vw;
    }

    div.book div.book_information div.book_title {
        font-size: 18px;
    }

    div.book div.book_article_with_picture {
        width: 100%;
    }

    div.book div.book_article_with_picture img {
        height: 16vw;
    }

    div.book div.book_article_with_picture div.article_title_with_picture {
        font-size: 16px;
    }

    div.book div.book_article_with_list {
        font-size: 14px;
    }

    div.book div.book_information div.book_description,
    div.book div.book_information div.book_articles_count,
    div.book div.change_book_mode div,
    div.book div.book_article_with_picture div.article_introduction {
        font-size: 12px;
    }
}

@media screen and (max-width: 480px) {
    div.book div.book_container {
        width: 86%;
        margin-left: 7%;
    }

    div.book div.book_top_part {
        margin-left: 2vw;
    }

    div.book img.book_cover {
        width: 22vw;
    }

    div.book div.book_information {
        margin-left: 2.5vw;
    }

    div.book div.book_information div.book_description {
        margin-top: 3px;
    }

    div.book div.change_book_mode {
        margin-top: 10px;
    }

    div.book div.book_article_with_picture img {
        height: 32vw;
    }

    div.book div.book_article_with_picture {
        margin-top: 24px;
    }

    div.book div.book_article_with_picture:first-child {
        margin-top: 30px;
    }

    div.book div.book_articles_with_list {
        margin-top: 16px;
    }

    div.book div.book_articles_with_list {
        padding-left: 18px;
        padding-right: 18px;
    }

    div.book div.book_article_with_list {
        padding: 13px 0;
    }
}

@media screen and (max-width: 360px) {
    div.book img.book_cover {
        width: 27vw;
    }

    div.book div.book_top_part {
        margin-left: 1vw;
    }

    div.book div.book_information div.book_title {
        margin-top: 6px;
    }
}