#introBook {
    padding: var(--top-tit-margin) 0;
}

#introBook .content-wrap {
    align-items: center;
}

#introBook .content-title {
    margin-bottom: 0;
}

#introBook .content-title h2 {
    font-size: var(--f80);
    font-weight: 800;
}

#introBook .content-title h5 {
    font-size: var(--f28);
    font-weight: 500;
    color: #fff;
    word-break: keep-all;
}

#introBook .content-title p.desc {
    font-size: 16px;
    font-weight: 400;
    margin-top: 20px;
}

#introBook .btn-wrap {
    margin-top: 50px;
}

/* book cover */
#bookCover {
    width: clamp(300px, 21vw, 392px);
    height: auto;
    aspect-ratio: 392/574;
    position: relative;
    text-align: center;
    margin: 2.5%;
    right: 6vw;
}

#bookCover .book-cover {
    position: absolute;
    z-index: 1;
    width: 100%;
    height: 100%;
    transform-origin: 0 50%;
    -webkit-transform-origin: 0 50%;
    background: #111;
    background-size: cover;
    border-radius: 3px;
    box-shadow:
        inset 4px 1px 3px #ffffff60,
        inset 0 -1px 2px #00000080;
    animation: bookOpen 2.5s ease-in-out infinite alternate;
    will-change: transform;
}

#bookCover .cover1 {
    background: url('/themes/basic/assets/images/who/book_cover.jpg');
}

#bookCover .book-cover {
    background-size: 100% 100%;
}

#bookCover .book-effect {
    width: 20px;
    height: 100%;
    margin-left: 10px;
    border-left: 2px solid #00000010;
    background-image: linear-gradient(90deg,
            rgba(255, 255, 255, 0.2) 0%,
            rgba(255, 255, 255, 0) 100%);
    animation: effectOpen 3s ease-in-out infinite alternate;
}

#bookCover .light {
    width: 90%;
    height: 100%;
    position: absolute;
    border-radius: 3px;
    background-image: linear-gradient(90deg,
            rgba(255, 255, 255, 0) 0%,
            rgba(255, 255, 255, 0.2) 100%);
    top: 0;
    right: 0;
    opacity: .1;
    animation: lightOpen 3s ease-in-out infinite alternate;
}

/* animation */
@keyframes bookOpen {
    0% {
        transform: perspective(2000px) rotateY(0deg);
        box-shadow:
            inset 4px 1px 3px #ffffff60,
            inset 0 -1px 2px #00000080;
    }

    100% {
        transform: perspective(2000px) rotateY(-30deg);
        box-shadow:
            inset 4px 1px 3px #ffffff60,
            inset 0 -1px 2px #00000080,
            10px 0px 10px -5px #00000030;
    }
}

@keyframes effectOpen {
    0% {
        width: 20px;
    }

    100% {
        width: 40px;
    }
}

@keyframes lightOpen {
    0% {
        opacity: .1;
        width: 90%;
    }

    100% {
        opacity: 1;
        width: 70%;
    }
}

#bookCover .book-inside {
    width: calc(100% - 2px);
    height: 96%;
    position: relative;
    top: 2%;
    border: 1px solid grey;
    border-radius: 3px;
    background: white;
    box-shadow:
        10px 40px 40px -10px #00000030,
        inset -2px 0 0 grey,
        inset -3px 0 0 #dbdbdb,
        inset -4px 0 0 white,
        inset -5px 0 0 #dbdbdb,
        inset -6px 0 0 white,
        inset -7px 0 0 #dbdbdb,
        inset -8px 0 0 white,
        inset -9px 0 0 #dbdbdb;
}

#bookAbout .bg-text {
    position: absolute;
    top: 2.8vw;
    left: 5.2vw;
    font-size: 200px;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.05);
    line-height: 1;
    z-index: 0;
    user-select: none;
}

#bookAbout .container {
    padding-top: 180px;
}

#bookAbout .about-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(2, 1fr);
}

#bookAbout .about-card {
    border-radius: 28px;
    padding: 60px 50px;
    box-sizing: border-box;
    backdrop-filter: blur(4px);
}

#bookAbout .about-card.light {
    background: #e7f0ed;
}

#bookAbout .about-card.dark {
    background: #005d3b;
    color: #fff;
}

#bookAbout .about-card h3 {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 50px;
}

#bookAbout .about-card p {
    font-size: var(--f18);
    font-weight: 400;
    line-height: 1.9;
    opacity: 0.6;
}

#bookAbout .author-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 30px;
}

#bookAbout .author-title p {
    font-size: var(--f22);
    font-weight: 700;
    color: #fff;
    opacity: 1;
}

#bookAbout .author-title p+p {
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
}

#coreMessage .content-wrap {
    justify-content: space-between;
    gap: 5vw;
}

#coreMessage .content-title h3 {
    font-weight: 800;
}

#coreMessage .content-title p.desc {
    font-size: var(--f18);
    font-weight: 400;
}

#coreMessage .core-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    flex: 0 1 auto;
}

#coreMessage .core-card {
    background: #f9f9f9;
    border-radius: 30px;
    padding: 50px 35px 30px;
    position: relative;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    row-gap: 70px;
}

#coreMessage .core-card h5 {
    font-size: var(--f22);
    font-weight: 700;
    margin-bottom: 20px;
    word-break: keep-all;
}

#coreMessage .core-card p {
    font-size: var(--f18);
    line-height: 1.9;
    color: var(--color-mute);
    word-break: keep-all;
}

#coreMessage .core-card .icon {
    width: 60px;
    align-self: end;
}

#bookRecommend .content-wrap {
    align-items: center;
}

#bookRecommend .content-title ul {
    margin-top: 40px;
}

#bookRecommend .content-title li {
    --line-height: 1.5;
    position: relative;
    padding-left: 35px;
    font-size: var(--f22);
    font-weight: 400;
    color: #fff;
    word-break: keep-all;
}

#bookRecommend .content-title li~li {
    margin-top: 20px;
}

#bookRecommend .content-title li::before {
    --width: 22px;
    content: '';
    display: block;
    position: absolute;
    left: 0;
    top: calc((var(--line-height) * 1em - var(--width)) / 2);
    background: url('/themes/basic/assets/images/who/icon_list_check.png') no-repeat center center / contain;
    width: var(--width);
    height: auto;
    aspect-ratio: 1;
}

#bookRecommend .btn-wrap {
    margin-top: 50px;
}

#bookRecommend .book-cover {
    width: clamp(300px, 21vw, 380px);
    flex-shrink: 0;
    margin-right: 4.6875vw;
}

#bookRecommend .book-cover img {
    display: block;
    width: 100%;
    box-shadow: 0 40px 90px rgba(0, 0, 0, 0.35);
}

/* Desktop ( 1024px ~)*/
@media all and (min-width: 1024px) {}

/* Laptop ( 1024px ~ 1440px)*/
@media all and (min-width: 1024px) and (max-width: 1440px) {
    #coreMessage .content-wrap {
        flex-direction: column;
    }
}

/* Tablet ( 768px ~ 1023px)*/
@media all and (min-width: 768px) and (max-width: 1023px) {
    #introBook .content-wrap {
        flex-direction: column;
        align-items: center;
    }

    #introBook .content-title {
        text-align: center;
    }

    /* book cover */
    #bookCover {
        margin: 2.5% auto;
        right: 0;
    }

    #bookAbout .bg-text {
        top: 3.8vw;
        left: 7.2vw;
        font-size: 160px;
    }

    #bookAbout .container {
        padding-top: 150px;
    }

    #bookAbout .about-grid {
        grid-template-columns: repeat(1, 1fr);
    }

    #bookAbout .about-card h3 {
        font-size: 38px;
        margin-bottom: 30px;
    }

    #bookAbout .author-title {
        margin-bottom: 20px;
    }

    #coreMessage .content-wrap {
        flex-direction: column;
        row-gap: var(--tit-margin);
    }

    #coreMessage .core-list {
        grid-template-columns: repeat(1, 1fr);
    }

    #coreMessage .core-card {
        padding: 35px 35px 30px;
        row-gap: 10px;
    }

    #coreMessage .core-card h5 {
        margin-bottom: 10px;
    }

    #coreMessage .core-card .icon {
        width: 40px;
    }

    #bookRecommend .content-wrap {
        flex-direction: column;
        align-items: center;
        row-gap: var(--tit-margin);
    }

    #bookRecommend .content-title h3 {
        text-align: center;
    }

    #bookRecommend .content-title ul {
        margin-top: 40px;
    }

    #bookRecommend .btn-wrap {
        justify-content: center;
    }

    #bookRecommend .book-cover {
        margin-right: 0;
    }
}

/* Mobile ( ~ 767px)*/
@media all and (max-width: 767px) {
    #introBook .content-wrap {
        flex-direction: column;
        align-items: center;
        row-gap: var(--tit-margin);
    }

    #introBook .content-title {
        text-align: center;
    }

    #introBook .content-title p.desc {
        font-size: 14px;
    }

    #introBook .btn-wrap {
        margin-top: 30px;
    }

    /* book cover */
    #bookCover {
        width: clamp(200px, 54vw, 300px);
        right: 0;
    }

    #bookAbout .bg-text {
        top: 8.5vw;
        left: 9vw;
        font-size: 85px;
    }

    #bookAbout .container {
        padding-top: 100px;
    }

    #bookAbout .about-grid {
        grid-template-columns: repeat(1, 1fr);
    }

    #bookAbout .about-card {
        border-radius: 20px;
        padding: 40px 35px;
    }

    #bookAbout .about-card h3 {
        font-size: 28px;
        margin-bottom: 20px;
    }

    #bookAbout .author-title {
        margin-bottom: 20px;
    }

    #coreMessage .content-wrap {
        flex-direction: column;
        row-gap: var(--tit-margin);
    }

    #coreMessage .core-list {
        grid-template-columns: repeat(1, 1fr);
    }

    #coreMessage .core-card {
        padding: 30px;
        row-gap: 15px;
    }

    #coreMessage .core-card h5 {
        margin-bottom: 10px;
    }

    #coreMessage .core-card .icon {
        width: 38px;
    }

    #bookRecommend .content-wrap {
        flex-direction: column;
        align-items: center;
        row-gap: var(--tit-margin);
    }

    #bookRecommend .content-title h3 {
        text-align: center;
    }

    #bookRecommend .content-title ul {
        margin-top: 30px;
    }

    #bookRecommend .content-title li {
        padding-left: 30px;
    }

    #bookRecommend .content-title li~li {
        margin-top: 15px;
    }

    #bookRecommend .content-title li::before {
        --width: 18px;
    }

    #bookRecommend .btn-wrap {
        margin-top: 35px;
        justify-content: center;
    }

    #bookRecommend .book-cover {
        width: clamp(200px, 54vw, 300px);
        margin-right: 0;
    }
}