.puzzle-img {
  position: relative;
  transform-style: preserve-3d;
  transition: all 1s;
  left: 10%;
  width: 80%;
  height: auto;
}
.puzzle-img-container:hover .puzzle-img {
  transform: rotateY(180deg);
}
.puzzle-img > .front {
  z-index: 1;
  position: relative;
}

.puzzle-img > .back {
  position: absolute;
  transform: translateZ(1px);
}

.cute-baby {
  position: relative;
  display: flex;
  width: 60%;
  height: auto;
  left: 20%;
}
.cute-baby img {
  width: 50%;
}
.cute-l img {
  height: 100%;
}
.cute-r img {
  height: 50%;
}

.book-container {
  position: relative;

  display: flex;
  flex-direction: column;
  justify-content: start;
  align-items: center;

  height: 50vw;
  width: 60vw;
  margin: 0 auto;

  transform-style: preserve-3d;
}
.book {
  position: relative;

  top: 5vw;
  height: 30vw;
  width: 30vw;

  transform-style: preserve-3d;
  perspective: 1900px;
}
.octopus-book {
  position: relative;

  height: 30vw;
  width: 20vw;
  left: 0;

  transform-style: preserve-3d;
  perspective: 1900px;

  transition: all 1s;

  margin-bottom: 7vw;
}
.octopus-book > .book-page {
  transition: all 1s;
}
.octopus-book-move {
  left: 50%;
  transition: all 1s;
}
.octopus-book .front {
  background-size: 100% 100%;
}
.octopus-book .back {
  background-size: 100% 100%;
}
.tip {
  content: "Click to read";
  position: relative;
  left: 0;
  top: 8vw;
  width: 100%;
  height: 1vw;
  text-align: center;

  font-family: "CG-bold";
  font-size: 2vw;

  color: rgb(159, 119, 181);
}
.book:hover::after {
  display: none;
}

.book-page {
  box-sizing: content-box;
  position: absolute;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  perspective: 900px;

  border-top: 0.5vw solid rgb(227, 196, 196);
  border-bottom: 0.5vw solid rgb(227, 196, 196);
  transform-origin: left;
}
.book-page > .front {
  position: absolute;
  z-index: 2;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
}
.book-page > .back {
  position: absolute;
  z-index: 1;
  width: 100%;
  height: 100%;
  transform-origin: center;
  transform: rotateY(180deg);
}
.options-container {
  z-index: 1;
  display: flex;
  position: relative;
  justify-content: space-between;
  width: 80%;
  margin: 0 auto;
  height: 2vw;
  text-align: center;
  font-size: 1vw;
  color: white;
  font-family: "CG-bold";
  padding: 0 5%;
  transform: scale(1.4);
}
.options-container :nth-child(1) {
  background-color: rgb(237 138 70);
}
.options-container :nth-child(2) {
  background-color: rgb(246 171 88);
}
.options-container :nth-child(3) {
  background-color: rgb(254 208 112);
}
.options-container :nth-child(4) {
  background-color: rgb(197 162 210);
}
.options-container :nth-child(5) {
  background-color: rgb(171 220 224);
}
.options-container :nth-child(6) {
  background-color: rgb(117 187 212);
}
.options-container :nth-child(7) {
  background-color: rgb(82 143 171);
}

.lan-change-btn::after {
  content: "Language";
  position: absolute;
  top: 0;
  left: 0;

  width: 100%;
  height: 100%;
}
.lan-option {
  line-height: 2vw;
  font-size: 0.8vw;

  width: 13%;
  height: 90%;
  border-radius: 0.5vw;
}

.download-option {
  line-height: 3vw;
  width: 5%;
  height: 100%;
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/download.png");
  background-size: 100% 100%;
}

.r0 {
  transition: all 1s;
  transform: rotateZ(0deg);
}
.drop-btn-container {
  position: relative;
  display: flex;
  justify-content: space-evenly;
  width: 100%;
}

.drop-btn {
  width: 30%;
  height: 23vw;
  transition: all 1s;
  background-size: 100% 100%;
}
.btn-1 > .drop-btn:nth-child(1) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/shuxun.png");
}
.btn-1 > .drop-btn:nth-child(2) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/jiefang.png");
}
.btn-2 > .drop-btn:nth-child(1) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/online.png");
}
.btn-2 > .drop-btn:nth-child(2) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/jams.png");
}
.btn-2 > .drop-btn:nth-child(3) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu-2/jams-2-2.png");
}
.btn-3 > .drop-btn:nth-child(1) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/cn1s.png");
}
.btn-3 > .drop-btn:nth-child(2) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/ynms.png");
}
.btn-3 > .drop-btn:nth-child(3) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/zibo.png");
}
.btn-4 > .drop-btn:nth-child(1) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/id.png");
}

.btn-4 > .drop-btn:nth-child(2) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/tianjiaban.png");
}

.btn-4 > .drop-btn:nth-child(3) {
  background-image: url("https://static.igem.wiki/teams/5038/img-edu/school/bds.png");
}

.drop-btn:hover {
  transform: scale(1.1);
}
.r180 {
  transition: all 1s;
  transform: rotateZ(180deg);
}
.drop-container {
  display: none;
  padding: 2vh 5%;
  background-color: #ffffff8f;
  border-radius: 2vw;
  width: 100%;
  margin: 0 auto;
  margin-bottom: 2vh;
  margin-top: 3vh;
}

.drop-container img {
  width: 90%;
  left: 5%;
}

.drop-container b {
  position: absolute;
  top: 0;
  left: 0;
  color: rgb(18, 134, 223);
  font-size: 1.5vh;
  line-height: 1.8vh;
}

.drop-container i {
  color: rgb(107, 27, 245);
  font-size: 1.8vh;
  line-height: 1.8vh;
}
.drop-title-1 {
  position: relative;

  padding-left: 10vh;
  font-size: 1.8vh;
  line-height: 1.8vh;
}
.drop-title-2 {
  position: relative;
  color: rgb(218, 154, 167);
  font-size: 3vh;
  line-height: 3vh;
  margin-bottom: -2vh;
}
.drop-text {
  font-size: 21px;
  line-height: 30px;
  margin: 2vh 0;

  text-align: justify;

  font-family: HarmonyOS_Sans, Ubuntu, -apple-system, BlinkMacSystemFont,
    Segoe UI, Roboto, Oxygen, Cantarell, Fira Sans, Droid Sans, Helvetica Neue,
    sans-serif;
}
.text-first {
  margin-top: 3vh;
}
.drop-img {
  position: relative;
  width: 80%;
  left: 10%;
  margin: 2vh 0;
}

#goDesign {
  /* color: rgb(108, 192, 255); */
  text-decoration: underline;
}
#goDesign:hover {
  color: rgb(108, 192, 255);
}
#goTaste {
  /* color: rgb(108, 192, 255); */
  text-decoration: underline;
}
#goTaste:hover {
  color: rgb(108, 192, 255);
}
#goANE {
  /* color: rgb(108, 192, 255); */
  text-decoration: underline;
}
#goANE:hover {
  color: rgb(108, 192, 255);
}
#checkBug {
  scroll-margin-top: -4.5vh;
}

.feedback-container {
  width: 60vw;
  height: 64vw;
  position: relative;
  margin: 0 auto;
}

.feedback-l {
  position: absolute;
  left: 0vw;
  top: 0;
  width: 100%;
}
.feedback-r {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  padding-top: 12vw;
  transition: all 1s;
}
.feedback-container img {
  width: 100%;
}
.feedback-l-move {
  animation: feedback_ani_1 1s both ease-in-out;
}
.feedback-l-back {
  animation: feedback_ani_2 1s both ease-in-out;
}
@keyframes feedback_ani_1 {
  0% {
    left: 0vw;
  }
  100% {
    left: -60vw;
  }
}
@keyframes feedback_ani_2 {
  0% {
    left: -60vw;
  }
  100% {
    left: 0vw;
  }
}

.feedback-r-move {
  animation: feedback_ani_3 1s both ease-in-out;
}
.feedback-r-back {
  animation: feedback_ani_4 1s both ease-in-out;
}
@keyframes feedback_ani_3 {
  0% {
    left: 0vw;
  }
  100% {
    left: 60vw;
  }
}
@keyframes feedback_ani_4 {
  0% {
    left: 60vw;
  }
  100% {
    left: 0vw;
  }
}