/* Animated card envelope styles & keyframes */

/* ==========================================================================
   Envelope Animation Component
   States: closed (default), opening (animation plays), open (final)
   Total animation duration: 2 seconds (1s flap + 1s card)
   ========================================================================== */

/* Container — centers the envelope and provides 3D perspective */
.envelope-wrapper {
  position: relative;
  width: 90vw;
  max-width: 320px;
  height: 220px;
  margin: 2rem auto;
  perspective: 1000px;
  cursor: pointer;
}

/* Envelope body — the main rectangular shape */
.envelope-back {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 70%;
  background: linear-gradient(135deg, #f5e6d3, #f0d9c0);
  border-radius: 0 0 8px 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 2;
}

/* Triangular flap — rotates open on X axis */
.envelope-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(180deg, #e8d4b8, #f0d9c0);
  clip-path: polygon(0 0, 50% 100%, 100% 0);
  transform-origin: top center;
  transform: rotateX(0deg);
  z-index: 3;
  transition: z-index 0s;
}

/* Invitation card — hidden inside, slides out upward */
.card {
  position: absolute;
  top: 20%;
  left: 5%;
  width: 90%;
  height: 80%;
  background: #ffffff;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transform: translateY(0);
  z-index: 1;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  text-align: center;
}

/* Card content is hidden until envelope opens */
.card .card-content {
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* ==========================================================================
   Keyframe Animations
   ========================================================================== */

/* Flap opens by rotating backward (up and over) */
@keyframes flapOpen {
  0% {
    transform: rotateX(0deg);
  }
  100% {
    transform: rotateX(-180deg);
  }
}

/* Card slides out from the envelope upward */
@keyframes cardSlideOut {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-60%);
  }
}

/* ==========================================================================
   Opening State — animation plays when .opening class is added by JS
   ========================================================================== */

.envelope-wrapper.opening .envelope-flap {
  animation: flapOpen 1s ease-in-out forwards;
  z-index: 0;
}

.envelope-wrapper.opening .card {
  animation: cardSlideOut 1s ease-in-out 1s forwards;
}

.envelope-wrapper.opening .card .card-content {
  opacity: 1;
  transition: opacity 0.4s ease 1.5s;
}

/* ==========================================================================
   Open State — final position after animation completes
   ========================================================================== */

.envelope-wrapper.open .envelope-flap {
  transform: rotateX(-180deg);
  z-index: 0;
}

.envelope-wrapper.open .card {
  transform: translateY(-60%);
}

.envelope-wrapper.open .card .card-content {
  opacity: 1;
}

/* Remove cursor pointer once open */
.envelope-wrapper.open {
  cursor: default;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Small phones */
@media (max-width: 360px) {
  .envelope-wrapper {
    width: 85vw;
    max-width: 280px;
    height: 190px;
  }
}

/* Tablets and larger */
@media (min-width: 768px) {
  .envelope-wrapper {
    max-width: 380px;
    height: 260px;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .envelope-wrapper {
    max-width: 400px;
    height: 280px;
  }
}