/* Envelope Animation Styles */

/* Envelope container */
.envelope-container {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2000;
  pointer-events: none;
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Envelope container starting position (will be set dynamically) */
.envelope-container.from-button {
  transform: translate(-50%, -50%) scale(0.1);
  opacity: 0;
}

/* Envelope wrapper */
.envelope {
  position: relative;
  width: 200px;
  height: 140px;
  transform-style: preserve-3d;
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Envelope base */
.envelope-base {
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #f4f4f4, #e8e8e8);
  border: 2px solid #d0d0d0;
  border-radius: 4px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* Envelope flap */
.envelope-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  background: linear-gradient(135deg, #f8f8f8, #ececec);
  border: 2px solid #d0d0d0;
  border-bottom: none;
  transform-origin: top center;
  transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  z-index: 1;
}

/* Envelope flap open state */
.envelope.opening .envelope-flap {
  transform: rotateX(-180deg);
}

/* Letter inside envelope */
.letter {
  position: absolute;
  top: 20px;
  left: 15px;
  width: calc(100% - 30px);
  height: calc(100% - 40px);
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 2px;
  transform: translateY(0);
  transition: transform 0.8s ease-out 0.3s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  opacity: 0.9;
}

/* Letter emerging from envelope */
.envelope.opening .letter {
  transform: translateY(-60px);
}

/* Hearts container */
.hearts-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1500;
}

/* Individual heart */
.heart {
  position: absolute;
  font-size: 20px;
  color: #ff6b9d;
  animation: float-heart 3s ease-out forwards;
  opacity: 0;
}

.heart:nth-child(2n) {
  color: #ff8fab;
  font-size: 16px;
}

.heart:nth-child(3n) {
  color: #ffa8cc;
  font-size: 24px;
}

.heart:nth-child(4n) {
  color: #ff4081;
  font-size: 18px;
}

/* Heart floating animation */
@keyframes float-heart {
  0% {
    opacity: 0;
    transform: translateY(0) scale(0.5) rotate(0deg);
  }
  10% {
    opacity: 1;
    transform: translateY(-20px) scale(1) rotate(5deg);
  }
  50% {
    opacity: 0.8;
    transform: translateY(-100px) scale(1.1) rotate(-5deg);
  }
  100% {
    opacity: 0;
    transform: translateY(-200px) scale(0.8) rotate(10deg);
  }
}

/* Envelope appear animation - smooth growth from button */
@keyframes envelope-appear {
  0% {
    opacity: 0;
    transform: scale(0.1) rotateY(20deg);
  }
  50% {
    opacity: 0.8;
    transform: scale(0.7) rotateY(10deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotateY(0deg);
  }
}

/* Envelope disappear animation */
@keyframes envelope-disappear {
  0% {
    opacity: 1;
    transform: scale(1) rotateY(0deg);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.1) rotateY(-10deg);
  }
  100% {
    opacity: 0;
    transform: scale(0.1) rotateY(-20deg) translateY(-100px);
  }
}

/* Envelope disappearing state */
.envelope.disappearing {
  animation: envelope-disappear 0.8s ease-in forwards;
}

/* Popup animation enhancement */
.popup.envelope-opening {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.3);
  animation: popup-envelope-appear 1s ease-out 1.5s forwards;
}

@keyframes popup-envelope-appear {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.3) rotateY(15deg);
  }
  30% {
    opacity: 0.3;
    transform: translate(-50%, -50%) scale(0.6) rotateY(8deg);
  }
  70% {
    opacity: 0.8;
    transform: translate(-50%, -50%) scale(0.95) rotateY(-2deg);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1) rotateY(0deg);
  }
}

/* Hide envelope when animation is complete */
.envelope-container.hidden {
  display: none;
}