/* Keep the photograph's paper tilt separate from the card's turn. */
.card-stage {
  position: relative;
  width: 100%;
  perspective: 1800px;
  perspective-origin: 50% 48%;
  transform: rotate(-.7deg);
}

.card-turner {
  position: relative;
  width: 100%;
  transform: rotateY(0deg);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transform-origin: 50% 50%;
  transition: transform 700ms cubic-bezier(.25, .65, .25, 1);
  will-change: transform;
}

.card-stage.is-flipped .card-turner {
  transform: rotateY(180deg);
}

.card-stage:not(.card-ready) .card-turner {
  transition: none;
}

/* A thin paper core sits between the two opaque faces. */
.card-turner::before {
  content: "";
  position: absolute;
  inset: 1px;
  background: #e9dece;
  box-shadow: 1px 1px 0 #cdbfae;
  transform: translateZ(0);
  pointer-events: none;
}

.card-stage .card-front,
.card-stage .card-back {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform-style: flat;
  border: 1px solid #e8dfd1;
  box-shadow: 0 2px 4px #4c3d2b09, 0 15px 36px #4c3d2b13;
}

/* This face stays in flow, setting the height of both sides. */
.card-stage .photo-paper.card-front {
  position: relative;
  margin: 0;
  padding-bottom: 48px;
  background: var(--paper, #fffdf8);
  transform: rotateY(0deg) translateZ(.8px);
  pointer-events: auto;
}

.card-stage .card-back {
  position: absolute;
  inset: 0;
  background: #fffaf0;
  transform: rotateY(180deg) translateZ(.8px);
  pointer-events: none;
}

.card-stage.is-flipped .card-front {
  pointer-events: none;
}

.card-stage.is-flipped .card-back {
  pointer-events: auto;
}

.card-back-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 42px 54px 64px;
  overflow: hidden;
  color: var(--ink, #423c35);
}

.card-salutation {
  flex: 0 0 auto;
  margin: 0 0 13px;
  font: italic 17px/1.5 Georgia, "Times New Roman", serif;
  color: #79665b;
}

.card-back h2 {
  flex: 0 0 auto;
  margin: 0 0 23px;
  font: 400 clamp(29px, 3.8vw, 40px)/1.12 Georgia, "Times New Roman", serif;
  letter-spacing: -.035em;
  color: #82575a;
  outline: none;
}

.card-message {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: #cdbba9 transparent;
  scrollbar-gutter: stable;
  -webkit-overflow-scrolling: touch;
  padding-right: 8px;
  overflow-wrap: anywhere;
  color: #5e5047;
}

.card-message p {
  margin: 0 0 1em;
  font: 400 18px/1.75 Georgia, "Times New Roman", serif;
  white-space: pre-wrap;
}

.card-message p:last-child {
  margin-bottom: 0;
}

.card-turn-cue {
  position: absolute;
  right: 17px;
  bottom: 3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin: 0;
  padding: 8px 9px;
  border: 0;
  border-radius: 2px;
  background: transparent;
  color: #756153;
  font: italic 14px/1.35 Georgia, "Times New Roman", serif;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  cursor: pointer;
  transition: color 160ms, text-decoration-color 160ms;
  z-index: 1;
}

.card-turn-cue:hover {
  color: #8a5157;
  text-decoration-color: #c39a92;
}

.card-turn-cue:focus-visible {
  outline: 2px solid #a06a59;
  outline-offset: 1px;
}

.card-turn-cue:disabled {
  cursor: default;
}

.card-stage:not(.card-ready) .card-turn-cue {
  visibility: hidden;
  pointer-events: none;
}

@media (max-width: 600px) {
  .card-stage {
    perspective: 1200px;
    transform: rotate(-.6deg);
  }

  .card-stage .photo-paper.card-front {
    padding-bottom: 48px;
  }

  .card-back-content {
    padding: 29px 24px 61px;
  }

  .card-salutation {
    margin-bottom: 12px;
    font-size: 15px;
  }

  .card-back h2 {
    margin-bottom: 20px;
    font-size: 31px;
  }

  .card-message {
    padding-right: 4px;
  }

  .card-message p {
    font-size: 16px;
    line-height: 1.7;
  }

  .card-turn-cue {
    right: 11px;
    font-size: 13px;
  }
}

@media (max-width: 360px) {
  .card-back-content {
    padding-inline: 21px;
  }

  .card-back h2 {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card-turner,
  .card-turn-cue {
    transition: none;
  }
}