@import url("https://fonts.googleapis.com/css2?family=Courgette&display=swap");

* {
  margin: 0;
  padding: 0;
  font-family: "Courgette";
  color: burlywood;
  text-shadow: 0 0 6px peru;
}

body {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(12, 1fr);
  min-height: 100vh;
  width: 100%;
  background-color: #121212;
}

.container {
  grid-row: 2/3;
  justify-self: center;
  align-self: center;
  grid-column: 5/9;
  text-align: center;
}

.letter_ct {
  width: 400px;
  height: 300px;
  grid-row: 4/7;
  grid-column: 5/9;
  display: flex;
  align-items: center;
  text-align: center;
  margin: auto;
}

.txt {
  grid-row: 9/11;
  grid-column: 5/9;
  text-align: center;
  font-size: large;
}

label {
  position: absolute;
}

.letter {
  grid: inherit;
  width: 400px;
  height: 300px;
  background-color: pink;
  border: 4px solid palevioletred;
  display: grid;
  transition: all 0.3s ease-in-out;
  position: absolute;
  border-radius: 0 0 7px 7px;
}

.main {
  box-shadow: 0 10px 30px purple;
}

.note {
  z-index: 1;
  justify-content: center;
  position: absolute;
  width: 390px;
  height: 270px;
  margin: 10px 9px;
  background-color: whitesmoke;
  p {
    margin: 15px 30px;
    font-size: 12px;
    color: purple;
  }
  .int {
    text-align: left;
  }
  .sign {
    text-align: right;
  }

  transform: translateY(0px);
  transition-duration: 0.3s;
}

.front {
  position: absolute;
  z-index: 2;
  width: 401px;
  height: 300px;
  background-color: rgb(252, 157, 188);
  margin: 4px;
  clip-path: polygon(50% 45%, 100% 0, 100% 100%, 0 100%, 0 0);
}

.flap-bg {
  z-index: 2;
  background-color: palevioletred;
  margin-top: 4px;
  clip-path: polygon(0% 0%, 100% 0%, 100% 1%, 50% 56%, 0 1%);

  transform: rotateX(0deg);
  transition-duration: 0.3s ease-in-out;
}

.flap {
  z-index: 2;
  margin-left: 3px;
  background-color: rgb(255, 163, 179);
  border: unset;
  clip-path: polygon(0 0, 100% 0, 50% 55%);

  transform: rotateX(0deg);
  transition-duration: 0.3s ease-in-out;
}

.heart {
  position: absolute;
  z-index: 4;
  cursor: pointer;
  height: 170px;
  width: 200px;

  scale: 30%;
  margin: 70px 102px;
  transition: transform 0.3s ease-in-out;
}

.heart::before,
.heart::after {
  content: "";
  position: absolute;
  width: 100px;
  height: 160px;
  background-color: rgb(178, 34, 106);
}

.heart::before {
  left: 100px;

  -webkit-transform-origin: 0 100%;
  transform-origin: 0 100%;

  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);

  border-radius: 50px 50px 0 0;
}

.heart::after {
  right: 100px;

  -webkit-transform-origin: 100% 100%;
  transform-origin: 100% 100%;

  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);

  -webkit-border-radius: 50px 50px 0 0;
  border-radius: 50px 50px 0 0;
}

/* checkbox */
#check {
  display: none;
}

input:not(:checked) ~ label .flap {
  transform-origin: top;
  transform: rotateX(0deg);
  transition: 0.3s ease-in-out;
  transition-delay: 0.3s;

  -webkit-transition-delay: 0.3s;
  -webkit-transform-origin: top;
  -webkit-transform: rotateX(0deg);
}

input:not(:checked) ~ label .flap-bg {
  transform-origin: top;
  transform: rotateX(0deg);
  transition: 0.3s ease-in-out;
  transition-delay: 0.3s;

  -webkit-transition-delay: 0.3s;
  -webkit-transform-origin: top;
  -webkit-transform: rotateX(0deg);
}

input:not(:checked) ~ label .heart {
  transform-origin: center 70%;
  transform: translateY(0px) rotate(0deg);
  transition-delay: 0.6s;

  -webkit-transition-delay: 0.6s;
  -webkit-transform-origin: center 70%;
  -webkit-transform: translateX(0px) rotate(0deg);
}

input:checked ~ label .flap {
  transform: rotateX(-180deg) translateY(-4px);
  transition: 0.3s ease-in-out;
  transition-delay: 0.3s;

  -webkit-transform-origin: top;
  -webkit-transform: rotateX(-180deg) translateY(-4px);
  -webkit-transition-delay: transform 0.3s ease;
}

input:checked ~ label .flap-bg {
  transform: rotateX(-180deg);
  transition: 0.3s ease-in-out;
  transition-delay: 0.3s;

  -webkit-transform-origin: top;
  -webkit-transform: rotateX(-180deg);
  -webkit-transition-delay: transform 0.3s ease;
  -webkit-transition-delay: 0.3s;
}

input:checked ~ label .flap,
input:checked ~ label .flap-bg {
  transform-origin: top;
  transition: transform 0.3s 0.4s, z-index 0s 0.6s;

  z-index: 0;
}

input:checked ~ label .heart {
  transform-origin: center 70%;
  transform: translateX(-60px) rotate(-70deg);
  transition-duration: 0.3s;

  -webkit-transform-origin: center 70%;
  -webkit-transform: translateX(-60px) rotate(-70deg);
  -webkit-transition-duration: 0.3s;
}

input:checked ~ label .note {
  transform: translateY(-200px);
  transition-delay: 0.8s;
}