/* First-visit introduction: envelope opening, invitation, then grand reveal. */
html.welcome-playing { overflow: hidden; }
.welcome-intro {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 24px;
  border: 0;
  background: var(--green);
  color: var(--cream);
  overflow: hidden;
}
.welcome-intro::backdrop { background: var(--green); }
.welcome-intro[open] {
  display: grid;
  place-items: center;
  animation: welcome-exit .65s ease 4.75s both;
}
.welcome-skip {
  position: absolute;
  top: max(25px, env(safe-area-inset-top));
  right: max(28px, env(safe-area-inset-right));
  z-index: 10;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--gold);
  background: var(--green);
  color: var(--cream);
  font: 11px Arial, sans-serif;
  letter-spacing: .14em;
  text-transform: uppercase;
  cursor: pointer;
}
.welcome-skip:hover { color: var(--gold); }
.welcome-skip:focus-visible { outline: 2px solid var(--gold); outline-offset: 5px; }
.welcome-envelope-scene {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding-top: min(18vh, 130px);
  background: #d9d4c4;
}
.welcome-envelope {
  position: relative;
  width: min(72vw, 520px, 78vh);
  aspect-ratio: 520 / 325;
  perspective: 1200px;
}
.welcome-envelope-back {
  position: absolute;
  inset: 0;
  background: #123326;
  border: 1px solid var(--gold);
}
.welcome-envelope-front {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}
.welcome-envelope-front svg { display: block; width: 100%; height: 100%; }
.welcome-envelope-flap {
  position: absolute;
  z-index: 4;
  top: 0;
  left: 0;
  width: 100%;
  height: 70%;
  background: #20533f;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: center top;
}
.welcome-envelope-flap svg { display: block; width: 100%; height: 100%; }
.welcome-seal {
  position: absolute;
  z-index: 5;
  top: 59%;
  left: 44.5%;
  width: 11%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid #b69048;
  background: var(--gold);
  color: #725523;
}
.welcome-seal span { font-size: clamp(12px, 2vw, 21px); letter-spacing: -.07em; }
.welcome-invitation {
  position: absolute;
  z-index: 2;
  bottom: 3%;
  left: 12%;
  width: 76%;
  height: 94%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 10%;
  background: #f5eddb;
  color: #264338;
}
.welcome-invitation-rule { position: absolute; inset: 6%; border: 3px double #c5ac76; }
.welcome-card-logo { width: 100%; max-width: 310px; }
.welcome-card-caption { font-size: clamp(9px, 1.2vw, 13px); font-style: italic; margin-top: 15px; }
.welcome-copy { position: relative; text-align: center; }
.welcome-brand { width: min(440px, 75vw); margin: 0 auto 30px; }
.welcome-copy h2 { font-size: clamp(48px, 7.5vw, 110px); line-height: 1.02; }
.welcome-rule { width: 84px; height: 1px; background: var(--gold); margin: 30px auto 22px; }
.welcome-caption { color: var(--muted); font-size: 17px; margin: 0; font-style: italic; }
.welcome-intro[open] .welcome-envelope-scene { animation: welcome-envelope-depart 3.35s ease both; }
.welcome-intro[open] .welcome-seal { animation: welcome-seal-release .45s ease .55s both; }
.welcome-intro[open] .welcome-envelope-flap { animation: welcome-open-flap .95s cubic-bezier(.4, 0, .2, 1) .8s both; }
.welcome-intro[open] .welcome-invitation { animation: welcome-card-rise 1.3s cubic-bezier(.2, .65, .2, 1) 1.55s both; }
.welcome-intro[open] .welcome-copy { animation: welcome-grand-reveal 1.2s ease 3.05s both; }
@keyframes welcome-seal-release { to { opacity: 0; transform: translateY(10px) scale(.85); } }
@keyframes welcome-open-flap {
  0% { transform: rotateX(0); z-index: 4; }
  49% { z-index: 4; }
  50% { z-index: 1; }
  100% { transform: rotateX(180deg); z-index: 1; }
}
@keyframes welcome-card-rise { from { transform: translateY(0); } to { transform: translateY(-67%); } }
@keyframes welcome-envelope-depart {
  0%, 82% { opacity: 1; transform: none; }
  100% { opacity: 0; transform: translateY(14px) scale(.98); }
}
@keyframes welcome-grand-reveal { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
@keyframes welcome-exit { 0% { opacity: 1; } 100% { opacity: 0; } }
@media (max-width: 600px) {
  .welcome-intro { padding: 22px; }
  .welcome-skip { right: 22px; font-size: 10px; }
  .welcome-brand { font-size: 10px; letter-spacing: .2em; }
  .welcome-caption { font-size: 15px; }
}
@media (prefers-reduced-motion: reduce) {
  .welcome-intro[open], .welcome-intro[open] * { animation: none !important; }
  .welcome-envelope-scene { display: none; }
}