/* Aufklappbare Grußkarte – gemeinsam für Editor-Vorschau und Empfängeransicht */

.card-scene {
  --w: 300px;
  --h: calc(var(--w) * 1.4);
  --speed: 1.1s;
  --ease: cubic-bezier(.65, 0, .35, 1);
  --r: calc(var(--w) * .02); /* Eckenradius außen; an der Falzkante 0 */
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: calc(var(--w) * 6);
}

.card {
  position: relative;
  width: var(--w);
  height: var(--h);
  transform-style: preserve-3d;
  transition: transform var(--speed) var(--ease);
  will-change: transform;
  cursor: pointer;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}
.card:focus { outline: none; }
.card:focus-visible:not(:active) { outline: 2px solid rgba(255, 255, 255, .7); outline-offset: 6px; } /* nur bei Tastaturbedienung */
.card.open { transform: translateX(calc(var(--w) / 2)); }
.card-scene.vertical .card.open { transform: translateY(calc(var(--h) / 2)); }

/* ---------- Gemeinsamer Schatten ----------
   Ein Element unter der Karte, das beim Aufklappen auf doppelte Breite (bzw. Höhe) wächst.
   So wirft keine Seite einen Schatten auf die andere, die Karte wirkt wie ein Stück. */
.card-shadow {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 200%;
  border-radius: var(--r);
  box-shadow: 0 calc(var(--w) * .05) calc(var(--w) * .14) rgba(0, 0, 0, .38), 0 1px 4px rgba(0, 0, 0, .18);
  transform-origin: right center;
  transform: translateZ(-2px) scaleX(.5);
  transition: transform var(--speed) var(--ease);
  pointer-events: none;
}
.card.open .card-shadow { transform: translateZ(-2px) scaleX(1); }
.card-scene.vertical .card-shadow { top: auto; left: 0; width: auto; height: 200%; transform-origin: center bottom; transform: translateZ(-2px) scaleY(.5); }
.card-scene.vertical .card.open .card-shadow { transform: translateZ(-2px) scaleY(1); }

/* ---------- Innenseite (rechts bzw. unten) ---------- */
.card-inside {
  position: absolute;
  inset: 0;
  background: var(--inside);
  border-radius: 0 var(--r) var(--r) 0;
  /* weiche Mittelfalte */
  background-image: linear-gradient(to right, rgba(0, 0, 0, .13), rgba(0, 0, 0, .04) 3%, transparent 9%);
}
.card-scene.vertical .card-inside {
  border-radius: 0 0 var(--r) var(--r);
  background-image: linear-gradient(to bottom, rgba(0, 0, 0, .13), rgba(0, 0, 0, .04) 3%, transparent 8%);
}
.card-inside::after { /* schließt die haarfeine Lücke an der Falzkante */
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -2px;
  width: 4px;
  background: color-mix(in srgb, var(--inside) 86%, #000);
  pointer-events: none;
}
.card-scene.vertical .card-inside::after { top: -2px; bottom: auto; left: 0; right: 0; width: auto; height: 4px; }
.card:not(.open) .card-inside::after { display: none; }
.card-inside::before {
  content: "";
  position: absolute;
  inset: 4%;
  border: 1px solid var(--accent);
  opacity: .45;
  border-radius: 2px;
  pointer-events: none;
}
.inside-content {
  position: absolute;
  inset: 9% 10%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.38;
  overflow-wrap: break-word;
}
.inside-content .greeting { margin: 0 0 .7em; font-size: 1.12em; }
.inside-content .message { margin: 0; white-space: pre-wrap; flex: 0 1 auto; }
.inside-content .signature { margin: 1em 0 0; text-align: right; font-size: 1.08em; white-space: pre-wrap; }
.inside-content .greeting:empty { display: none; }

/* ---------- Deckel ---------- */
.card-cover {
  position: absolute;
  inset: 0;
  transform-origin: left center;
  transform-style: preserve-3d;
  transform: translateZ(1px) rotateY(0deg);
  transition: transform var(--speed) var(--ease);
  will-change: transform;
}
.card.open .card-cover { transform: translateZ(1px) rotateY(-180deg); }
.card-scene.vertical .card-cover { transform-origin: center top; transform: translateZ(1px) rotateX(0deg); }
.card-scene.vertical .card.open .card-cover { transform: translateZ(1px) rotateX(180deg); }

.cover-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
}
.cover-face * { backface-visibility: hidden; -webkit-backface-visibility: hidden; }

/* Die abgewandte Seite wird per JS exakt ab 90° ausgeblendet (Klasse .flipped),
   weil manche Mobilbrowser backface-visibility bei Kindelementen ignorieren. */
.card.flipped .cover-front, .card:not(.flipped) .cover-back { visibility: hidden; }

.cover-front { background: var(--bg1); border-radius: 0 var(--r) var(--r) 0; }
.card-scene.vertical .cover-front { border-radius: 0 0 var(--r) var(--r); }
.cover-front img { display: block; width: 100%; height: 100%; object-fit: cover; user-select: none; -webkit-user-drag: none; }
.cover-front::after { /* leichter Papierglanz */
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(255, 255, 255, .18), transparent 40%, transparent 70%, rgba(0, 0, 0, .12));
  pointer-events: none;
}
.front-title {
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: 4.5%;
  padding: .1em .3em .2em;
  text-align: center;
  font-family: 'Great Vibes', cursive;
  font-size: calc(var(--w) * .105);
  line-height: 1.15;
  word-spacing: .18em;
  color: var(--ink);
  background: color-mix(in srgb, var(--inside) 86%, transparent);
  border-radius: calc(var(--w) * .02);
  box-shadow: 0 2px 10px rgba(0, 0, 0, .18);
}
.front-title:empty { display: none; }

.cover-back {
  transform: rotateY(180deg);
  background: var(--inside);
  border-radius: var(--r) 0 0 var(--r);
  background-image: linear-gradient(to left, rgba(0, 0, 0, .09), rgba(0, 0, 0, .03) 3%, transparent 9%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: calc(var(--w) * .06);
  color: var(--ink);
}
.card-scene.vertical .cover-back {
  transform: rotateX(180deg);
  border-radius: var(--r) var(--r) 0 0;
  background-image: linear-gradient(to top, rgba(0, 0, 0, .09), rgba(0, 0, 0, .03) 3%, transparent 8%);
}
.cover-back .medallion {
  width: 46%;
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  border: calc(var(--w) * .012) solid var(--accent);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .2);
}
.cover-back .medallion img { width: 100%; height: 100%; object-fit: cover; object-position: center 35%; display: block; }
.cover-back .year {
  font-family: 'Great Vibes', cursive;
  font-size: calc(var(--w) * .1);
  line-height: 1;
  word-spacing: .18em;
  text-align: center;
}
.cover-back .year small {
  display: block;
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: .38em;
  letter-spacing: .3em;
  text-transform: uppercase;
  margin-top: .5em;
  opacity: .7;
}

/* Kleines "Wackeln" als Hinweis, dass man die Karte öffnen kann */
.card.hint:not(.open) .card-cover { animation: nudge-y 2.8s ease-in-out 1.2s infinite; }
.card-scene.vertical .card.hint:not(.open) .card-cover { animation-name: nudge-x; }
@keyframes nudge-y {
  0%, 70%, 100% { transform: translateZ(1px) rotateY(0deg); }
  80% { transform: translateZ(1px) rotateY(-16deg); }
  90% { transform: translateZ(1px) rotateY(-4deg); }
}
@keyframes nudge-x {
  0%, 70%, 100% { transform: translateZ(1px) rotateX(0deg); }
  80% { transform: translateZ(1px) rotateX(16deg); }
  90% { transform: translateZ(1px) rotateX(4deg); }
}

@media (prefers-reduced-motion: reduce) {
  .card-scene { --speed: .01s; }
  .card.hint .card-cover { animation: none !important; }
}