#envelope {
  position: relative;
  width: 280px;
  height: 180px;
  border-bottom-left-radius: 6px;
  border-bottom-right-radius: 6px;
  margin-left: auto;
  margin-right: auto;
  top: 150px;
  background-color: #00334c;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.front {
  position: absolute;
  width: 0;
  height: 0;
  z-index: 3;
}
.flap {
  border-left: 140px solid transparent;
  border-right: 140px solid transparent;
  border-bottom: 82px solid transparent;
  border-top: 98px solid #00334c;
  transform-origin: top;
}
.pocket {
  border-left: 140px solid #0077b2;
  border-right: 140px solid #0077b2;
  border-bottom: 90px solid #006da3;
  border-top: 90px solid transparent;
  border-bottom-left-radius: 6px;
  border-bottom-right-radius: 6px;
}
.letter {
  position: relative;
  background-color: #fff;
  width: 90%;
  margin-left: auto;
  margin-right: auto;
  height: 90%;
  top: 5%;
  border-radius: 6px;
  box-shadow: 0 2px 26px rgba(0, 0, 0, 0.12);
}
.letter:after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-image: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0) 25%,
    rgba(215, 227, 239, 0.7) 55%,
    rgba(215, 227, 239, 1) 100%
  );
}
.words {
  position: absolute;
  left: 10%;
  width: 80%;
  height: 14%;
  background-color: #f5f6f7;
}
.words.line1 {
  top: 10%;
  width: 15%;
  /* height: 7%; */
  font-size: 18px;
  /* font-weight: bold; */
}
.words.line2 {
  top: 30%;
  font-size: 18px;
  /* font-weight: bold; */
}
.words.line3 {
  top: 50%;
}
.words.line4 {
  top: 70%;
}
.open .flap {
  transform: rotatex(180deg);
  transition: transform 0.4s ease, z-index 0.6s;
  z-index: 1;
}
.close .flap {
  transform: rotatex(0deg);
  transition: transform 0.4s 0.6s ease, z-index 1s;
  z-index: 5;
}
.close .letter {
  transform: translatey(0px);
  transition: transform 0.4s ease, z-index 1s;
  z-index: 1;
}
.open .letter {
  transform: translatey(-60px);
  transition: transform 0.4s 0.6s ease, z-index 0.6s;
  z-index: 2;
}
.hearts {
  position: absolute;
  top: 90px;
  left: 0;
  right: 0;
  z-index: 2;
}
.heart {
  position: absolute;
  bottom: 0;
  right: 10%;
}
.heart:before,
.heart:after {
  position: absolute;
  content: "";
  left: 50px;
  top: 0;
  width: 50px;
  height: 80px;
  background: #d00000;
  border-radius: 50px 50px 0 0;
  transform: rotate(-45deg);
  transform-origin: 0 100%;
}
.heart:after {
  left: 0;
  transform: rotate(45deg);
  transform-origin: 100% 100%;
}
.close .heart {
  opacity: 0;
  animation: none;
}
.a1 {
  left: 20%;
  transform: scale(0.6);
  opacity: 1;
  animation: slideUp 4s linear 1, sideSway 2s ease-in-out 4 alternate;
  animation-fill-mode: forwards;
  animation-delay: 0.7s;
}
.a2 {
  left: 55%;
  transform: scale(1);
  opacity: 1;
  animation: slideUp 5s linear 1, sideSway 4s ease-in-out 2 alternate;
  animation-fill-mode: forwards;
  animation-delay: 0.7s;
}
.a3 {
  left: 10%;
  transform: scale(0.8);
  opacity: 1;
  animation: slideUp 7s linear 1, sideSway 2s ease-in-out 6 alternate;
  animation-fill-mode: forwards;
  animation-delay: 0.7s;
}
@keyframes slideUp {
  0% {
    top: 0;
  }
  100% {
    top: -600px;
  }
}
@keyframes sideSway {
  0% {
    margin-left: 0px;
  }
  100% {
    margin-left: 50px;
  }
}
body {
  background-color: #a8e2ff;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  margin: 0;
  transition: opacity 0.2s ease;
  opacity: 1;
}

body.fade-out {
  opacity: 0;
}

.envelope-wrapper {
  height: 380px;
}

/* Heart Seal */
.seal-heart {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 1000;
  animation: shake 0.5s ease-in-out infinite;
}

.seal-heart:before,
.seal-heart:after {
  position: absolute;
  content: "";
  width: 30px;
  height: 50px;
  border-radius: 50px 50px 0 0;
  transform: rotate(-45deg);
  transform-origin: 0 100%;
}

.seal-heart:after {
  left: 30px;
  transform: rotate(45deg);
  transform-origin: 100% 100%;
}

/* Shaking animation for heart */
@keyframes shake {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  25% {
    transform: translate(-50%, -50%) rotate(-10deg);
  }
  50% {
    transform: translate(-50%, -50%) rotate(10deg);
  }
  75% {
    transform: translate(-50%, -50%) rotate(-10deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
}

.seal-heart.shake {
  animation: shake 0.5s ease-in-out infinite;
}

.click-here-text {
  position: absolute;
  top: calc(50% - 40px); /* Position below the heart */
  left: 50%;
  transform: translate(-50%, 0);
  font-size: 14px;
  color: rgba(238, 85, 146, 1);
  font-weight: bold;
  text-align: center;
  animation: blink 1s steps(2, start) infinite;
  z-index: 1000;
}

.to-open {
  position: absolute;
  top: calc(50% + 25px); /* Position below the heart */
  left: 50%;
  transform: translate(-50%, 0);
  font-size: 14px;
  color: rgba(238, 85, 146, 1);
  font-weight: bold;
  text-align: center;
  animation: blink 1s steps(2, start) infinite;
  z-index: 1000;
}

@keyframes blink {
  to {
    visibility: hidden;
  }
}

@media only screen and (max-width: 600px) {
  body {
    height: 80vh;
  }
}