/* Premium first-card birthday opening animation. */
.birthday-opening-card {
  display: none;
}

.onboarding-card.onboarding-birthday-card {
  width: min(920px, 100%);
  padding: clamp(14px, 3vw, 30px);
  text-align: center;
  overflow: visible;
  perspective: 2200px;
  perspective-origin: 50% 46%;
  background:
    radial-gradient(circle at 50% -12%, rgba(245,200,106,.30), transparent 44%),
    radial-gradient(circle at 0% 100%, rgba(119,191,255,.12), transparent 38%),
    linear-gradient(145deg, rgba(255,255,255,.115), rgba(255,255,255,.035));
  box-shadow: 0 44px 140px rgba(0,0,0,.46), inset 0 1px 0 rgba(255,255,255,.08);
}

.onboarding-birthday-card #birthdayOpeningCard {
  display: block;
}

.onboarding-birthday-card #onboardingSymbol,
.onboarding-birthday-card #onboardingKicker,
.onboarding-birthday-card #onboardingTitle,
.onboarding-birthday-card #onboardingCopy {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
}

.birthday-card-stage {
  --birthday-art-ratio: 1103 / 1426;
  --birthday-stage-width: min(560px, calc(100vw - 52px), calc((100dvh - 178px) * 1103 / 1426));
  width: var(--birthday-stage-width);
  margin: 0 auto;
  position: relative;
  transform-style: preserve-3d;
  isolation: isolate;
}

.birthday-card-stage::before,
.birthday-card-stage::after {
  content: "";
  position: absolute;
  pointer-events: none;
  z-index: 4;
  opacity: 0;
}

.birthday-card-stage::before {
  inset: -14% -18%;
  background:
    radial-gradient(circle at 18% 28%, rgba(255,235,171,.72) 0 2px, transparent 3px),
    radial-gradient(circle at 77% 18%, rgba(255,255,255,.52) 0 1px, transparent 2px),
    radial-gradient(circle at 84% 70%, rgba(245,200,106,.52) 0 2px, transparent 3px),
    radial-gradient(circle at 9% 74%, rgba(255,255,255,.38) 0 1px, transparent 2px);
  filter: drop-shadow(0 0 14px rgba(245,200,106,.32));
}

.birthday-card-stage::after {
  inset: -4%;
  border-radius: 34px;
  background: radial-gradient(circle at 52% 42%, rgba(245,200,106,.18), transparent 56%);
  mix-blend-mode: screen;
}

.birthday-card-shadow {
  position: absolute;
  left: 9%;
  right: 9%;
  bottom: -22px;
  height: 44px;
  border-radius: 999px;
  background: radial-gradient(ellipse, rgba(0,0,0,.52), rgba(0,0,0,.18) 48%, transparent 72%);
  filter: blur(10px);
  opacity: .58;
  transform: translateZ(-120px) scaleX(.8);
}

.birthday-card-book {
  position: relative;
  width: 100%;
  aspect-ratio: var(--birthday-art-ratio);
  transform-style: preserve-3d;
  transform-origin: 50% 58%;
  animation: birthdayBookLift 1200ms cubic-bezier(.18,.88,.2,1) both;
  will-change: transform, opacity;
}

.birthday-card-back,
.birthday-card-inside,
.birthday-card-cover {
  position: absolute;
  inset: 0;
  border-radius: clamp(18px, 5.3vw, 30px);
  overflow: hidden;
  border: 1px solid rgba(245,200,106,.34);
  background: #fffdf8;
  box-shadow: 0 32px 96px rgba(0,0,0,.38), inset 0 1px 0 rgba(255,255,255,.78);
  transform-style: preserve-3d;
  will-change: transform, opacity, filter;
}

.birthday-card-back {
  transform: translate3d(0, 7px, -22px) scale(.985);
  opacity: .34;
  filter: saturate(.9) brightness(.86);
}

.birthday-card-inside {
  transform: translate3d(0, 0, 1px);
  box-shadow: 0 26px 80px rgba(0,0,0,.34), inset 0 0 0 1px rgba(255,255,255,.52);
}

.birthday-card-inside::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0,0,0,.16), transparent 9%, transparent 91%, rgba(0,0,0,.08)),
    radial-gradient(circle at 50% 8%, rgba(255,255,255,.22), transparent 32%);
  opacity: .32;
}

.birthday-card-cover {
  transform-origin: left center;
  transform: translate3d(0, 0, 12px) rotateY(0deg);
  box-shadow: 0 42px 120px rgba(0,0,0,.48), inset 0 1px 0 rgba(255,255,255,.72);
}

.birthday-card-cover::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: clamp(10px, 2.6vw, 18px);
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(0,0,0,.34), rgba(255,255,255,.18), transparent);
  opacity: .55;
}

.birthday-card-book img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  object-position: center center;
  background: #fffdf8;
  user-select: none;
  -webkit-user-drag: none;
  image-rendering: auto;
  transform: translateZ(0);
  backface-visibility: hidden;
}

.birthday-card-cover::after {
  content: "";
  position: absolute;
  inset: -2%;
  pointer-events: none;
  background:
    linear-gradient(105deg, transparent 3%, rgba(255,255,255,.64) 39%, rgba(255,255,255,.12) 49%, transparent 62%),
    radial-gradient(circle at 80% 4%, rgba(255,255,255,.28), transparent 26%);
  transform: translateX(-135%) skewX(-8deg);
  opacity: 0;
}

.birthday-card-play .birthday-card-cover {
  animation: birthdayCoverOpen 2350ms 240ms cubic-bezier(.15,.82,.16,1) both;
}

.birthday-card-play .birthday-card-inside {
  animation: birthdayInsideReveal 2050ms 520ms cubic-bezier(.18,.84,.18,1) both;
}

.birthday-card-play .birthday-card-cover::after {
  animation: birthdayCardSheen 1700ms 360ms ease-out both;
}

.birthday-card-play .birthday-card-shadow {
  animation: birthdayShadowOpen 2200ms 240ms cubic-bezier(.16,.84,.22,1) both;
}

.birthday-card-play .birthday-card-stage::before {
  animation: birthdaySparkleField 2200ms 760ms ease-out both;
}

.birthday-card-play .birthday-card-stage::after {
  animation: birthdayWarmAura 2100ms 560ms ease-out both;
}

@keyframes birthdayBookLift {
  0% { opacity: 0; transform: translate3d(0, 26px, 0) scale(.94) rotateX(9deg); filter: brightness(.82) saturate(.92); }
  56% { opacity: 1; transform: translate3d(0, -2px, 0) scale(1.018) rotateX(0deg); filter: brightness(1.04) saturate(1.02); }
  100% { opacity: 1; transform: translate3d(0, 0, 0) scale(1) rotateX(0deg); filter: brightness(1) saturate(1); }
}

@keyframes birthdayCoverOpen {
  0% { transform: translate3d(0, 0, 12px) rotateY(0deg); filter: brightness(1); }
  36% { transform: translate3d(-1px, 0, 18px) rotateY(-58deg); filter: brightness(1.05); }
  66% { transform: translate3d(-8px, 0, 18px) rotateY(-123deg); filter: brightness(.96); }
  100% { transform: translate3d(-13px, 0, 14px) rotateY(-148deg); filter: brightness(.9) saturate(.94); }
}

@keyframes birthdayInsideReveal {
  0% { transform: translate3d(0, 6px, 1px) scale(.992); filter: brightness(.78) saturate(.92); }
  46% { transform: translate3d(0, -2px, 2px) scale(1.006); filter: brightness(1.10) saturate(1.04); }
  100% { transform: translate3d(0, 0, 1px) scale(1); filter: brightness(1) saturate(1); }
}

@keyframes birthdayCardSheen {
  0% { transform: translateX(-135%) skewX(-8deg); opacity: 0; }
  24% { opacity: .92; }
  100% { transform: translateX(135%) skewX(-8deg); opacity: 0; }
}

@keyframes birthdaySparkleField {
  0% { opacity: 0; transform: scale(.98); }
  28% { opacity: 1; }
  100% { opacity: 0; transform: scale(1.04); }
}

@keyframes birthdayWarmAura {
  0% { opacity: 0; transform: scale(.96); }
  45% { opacity: 1; }
  100% { opacity: .18; transform: scale(1.02); }
}

@keyframes birthdayShadowOpen {
  0% { opacity: .42; transform: translateZ(-120px) scaleX(.72); }
  55% { opacity: .72; transform: translateZ(-120px) scaleX(.96); }
  100% { opacity: .78; transform: translateZ(-120px) scaleX(1.06); }
}

@media (max-width: 620px) {
  .onboarding-card.onboarding-birthday-card {
    width: 100%;
    padding: 12px;
    border-radius: 28px;
  }

  .birthday-card-stage {
    --birthday-stage-width: min(calc(100vw - 36px), calc((100dvh - 154px) * 1103 / 1426), 520px);
  }

  .birthday-card-shadow {
    bottom: -16px;
    height: 34px;
  }
}

@media (max-width: 380px) {
  .birthday-card-stage {
    --birthday-stage-width: min(calc(100vw - 30px), calc((100dvh - 146px) * 1103 / 1426));
  }
}

@media (prefers-reduced-motion: reduce) {
  .birthday-card-book,
  .birthday-card-cover,
  .birthday-card-cover::after,
  .birthday-card-inside,
  .birthday-card-shadow,
  .birthday-card-stage::before,
  .birthday-card-stage::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

  .birthday-card-cover {
    transform: translate3d(-13px, 0, 14px) rotateY(-148deg);
  }
}