/* 大banner部分 */
.book-banner {
    width: 100%;
    height: 473px;
    background: url("../images/part4_bg.png") no-repeat center;
    background-size: 100% 100%;
}

.banner-content {
    width: 1000px;
    padding: 65px 0;
    display: flex;
    align-items: flex-start;
}

.banner-left {
    width: 256px;
    height: 345px;
    margin-right: 64px;
    flex-shrink: 0;
}

.banner-left img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

.banner-right {
    color: #ffffff;
}

.banner-title {
    font-size: 32px;
    line-height: 41px;
    margin-bottom: 32px;
}

.banner-desc {
    font-size: 16px;
    line-height: 32px;
    margin-bottom: 32px;
}

.more-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 96px;
    height: 48px;
    background-color: rgba(72, 192, 163, 0.5);
    color: #ffffff;
    font-size: 16px;
    text-decoration: none;
}