.van-image{position:relative;display:inline-block}.van-image--round{overflow:hidden;border-radius:50%}.van-image--round img{border-radius:inherit}.van-image__error,.van-image__img,.van-image__loading{display:block;width:100%;height:100%}.van-image__error,.van-image__loading{position:absolute;top:0;left:0;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;color:#969799;font-size:.37333rem;background-color:#f7f8fa}.van-image__error-icon,.van-image__loading-icon{color:#dcdee0;font-size:.85333rem}.van-swipe{position:relative;overflow:hidden;-webkit-transform:translateZ(0);transform:translateZ(0);cursor:grab;-webkit-user-select:none;user-select:none}.van-swipe__track{display:-webkit-box;display:-webkit-flex;display:flex;height:100%}.van-swipe__track--vertical{-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column}.van-swipe__indicators{position:absolute;bottom:.32rem;left:50%;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-transform:translateX(-50%);transform:translateX(-50%)}.van-swipe__indicators--vertical{top:50%;bottom:auto;left:.32rem;-webkit-box-orient:vertical;-webkit-box-direction:normal;-webkit-flex-direction:column;flex-direction:column;-webkit-transform:translateY(-50%);transform:translateY(-50%)}.van-swipe__indicators--vertical .van-swipe__indicator:not(:last-child){margin-bottom:.16rem}.van-swipe__indicator{width:.16rem;height:.16rem;background-color:#ebedf0;border-radius:100%;opacity:.3;-webkit-transition:opacity .2s,background-color .2s;transition:opacity .2s,background-color .2s}.van-swipe__indicator:not(:last-child){margin-right:.16rem}.van-swipe__indicator--active{background-color:#1989fa;opacity:1}.van-swipe-item{position:relative;-webkit-flex-shrink:0;flex-shrink:0;width:100%;height:100%}.van-image-preview{position:fixed;top:0;left:0;width:100%;height:100%}.van-image-preview__swipe{height:100%}.van-image-preview__swipe-item{display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center;overflow:hidden}.van-image-preview__cover{position:absolute;top:0;left:0}.van-image-preview__image{width:100%;-webkit-transition-property:-webkit-transform;transition-property:-webkit-transform;transition-property:transform;transition-property:transform,-webkit-transform}.van-image-preview__image--vertical{width:auto;height:100%}.van-image-preview__image img{-webkit-user-drag:none}.van-image-preview__image .van-image__error{top:30%;height:40%}.van-image-preview__image .van-image__error-icon{font-size:.96rem}.van-image-preview__image .van-image__loading{background-color:transparent}.van-image-preview__index{position:absolute;top:.42667rem;left:50%;color:#fff;font-size:.37333rem;line-height:.53333rem;text-shadow:0 .02667rem .02667rem #323233;-webkit-transform:translate(-50%);transform:translate(-50%)}.van-image-preview__overlay{background-color:rgba(0,0,0,.9)}.van-image-preview__close-icon{position:absolute;z-index:1;color:#c8c9cc;font-size:.58667rem;cursor:pointer}.van-image-preview__close-icon:active{color:#969799}.van-image-preview__close-icon--top-left{top:.42667rem;left:.42667rem}.van-image-preview__close-icon--top-right{top:.42667rem;right:.42667rem}.van-image-preview__close-icon--bottom-left{bottom:.42667rem;left:.42667rem}.van-image-preview__close-icon--bottom-right{right:.42667rem;bottom:.42667rem}.course-introduce-container[data-v-6d359f38]{width:100%}.book-name[data-v-6d359f38]{width:100%;font-size:.42667rem;text-align:center;line-height:.66667rem;background-color:#f6f7f8;padding:.26667rem .8rem;box-sizing:border-box}.section[data-v-6d359f38]{width:100%;background-color:#f6f7f8;margin-top:.53333rem;text-align:center;padding-bottom:.53333rem}.video[data-v-6d359f38]{max-width:11.04rem;width:90%}video[data-v-6d359f38]:focus{outline:0 auto -webkit-focus-ring-color}.image[data-v-6d359f38]{max-width:11.04rem;width:90%;display:block;margin:.26667rem auto}.title[data-v-6d359f38]{width:100%;height:1.33333rem;position:relative;text-align:left}.title-text[data-v-6d359f38]{color:#000;font-weight:700;line-height:1.33333rem;font-size:.42667rem;margin-left:.53333rem}.title-icon[data-v-6d359f38]{position:absolute;top:50%;left:.26667rem;transform:translateY(-50%);width:.10667rem;height:.53333rem;border-radius:.05333rem;background-color:#00c553}