* {
  box-sizing: border-box;
}

:root {
  --wine: #260d10;
  --pale: #f4ead7;
  --gold: #c8a66a;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(
    ellipse at 50% 35%,
    #552328 0%,
    #260d10 58%,
    #160709 100%
  );
  color: var(--pale);
}

body {
  font-family: Montserrat, sans-serif;
  overflow-x: hidden;
}

.scene {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 28px 16px;
}

.envelope-wrap {
  width: min(92vw, 560px);
  text-align: center;
  perspective: 1400px;
}

.envelope {
  position: relative;
  width: 100%;
  aspect-ratio: 1.48;
  transform-style: preserve-3d;
  filter: drop-shadow(0 28px 30px #0008);
}

.envelope-back,
.envelope-front {
  position: absolute;
  inset: 0;
  border: 1px solid #a77e48;
  background: linear-gradient(145deg, #4a171d, #260d10 65%);
  border-radius: 5px;
}

.envelope-back:before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid #9d794c;
  opacity: .65;
}

.envelope-front {
  clip-path: polygon(0 0, 50% 58%, 100% 0, 100% 100%, 0 100%);
  background: linear-gradient(150deg, #5a2025, #351115);
  z-index: 4;
}

.envelope-front:after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(35deg, transparent 49.7%, #9b7448 50%, transparent 50.3%),
    linear-gradient(-35deg, transparent 49.7%, #9b7448 50%, transparent 50.3%);
  opacity: .45;
}

.letter {
  position: absolute;
  z-index: 2;
  left: 6%;
  right: 6%;
  top: 5%;
  height: 90%;
  background: var(--pale);
  color: #4a2923;
  transition: transform 1.35s cubic-bezier(.2,.75,.2,1), top 1.35s;
  overflow: auto;
}

.letter-inner {
  padding: clamp(14px, 4vw, 30px) 16px 20px;
  text-align: center;
}

.eyebrow,
.details,
.footer {
  font-size: 8px;
  letter-spacing: 2px;
}

h1 {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(36px, 9vw, 62px);
  font-weight: 500;
  margin: 9px 0 0;
  color: #57332b;
}

h1 span {
  font-style: italic;
  color: #b18a51;
}

.ornament {
  color: #b18a51;
  font-size: 21px;
  margin: 5px 0 12px;
}

.ornament span {
  font-size: 11px;
  padding: 0 9px;
}

.couple-portrait {
  width: min(78%, 300px);
  margin: 12px auto 15px;
  padding: 6px;
  border: 1px solid #b18a51;
  outline: 1px solid #d7c39c;
  outline-offset: 3px;
  background: #eee1c7;
}

.couple-portrait img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.invite {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(17px, 4.4vw, 22px);
  margin: 8px auto;
  max-width: 380px;
}

.story,
.join {
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(13px, 3.4vw, 16px);
  line-height: 1.35;
  max-width: 390px;
  margin: 7px auto;
}

.rule {
  width: 70px;
  border-top: 1px solid #b18a51;
  margin: 12px auto 8px;
}

.date {
  font-family: "Cormorant Garamond", serif;
  font-size: 25px;
  letter-spacing: 3px;
  margin: 5px 0;
}

.details {
  margin: 3px 0 5px;
}

.venue {
  font-family: "Cormorant Garamond", serif;
  font-size: 22px;
  margin: 0;
}

.countdown {
  font-size: 9px;
  letter-spacing: 1px;
  margin: 8px 0;
  color: #936d43;
}

.footer {
  margin-top: 9px;
}

.seal {
  position: absolute;
  z-index: 6;
  left: 50%;
  top: 55%;
  transform: translate(-50%, -50%);
  width: 68px;
  height: 68px;
  border-radius: 50%;
  border: 1px solid #e1c58e;
  background: radial-gradient(circle at 35% 30%, #d5b87e, #8f6738 75%);
  color: #321317;
  box-shadow: 0 3px 12px #0008;
  cursor: pointer;
  font-family: "Cormorant Garamond", serif;
  font-size: 19px;
}

.seal i {
  font-size: 13px;
}

.tap-hint {
  font-size: 10px;
  letter-spacing: 3px;
  color: #d7bd8b;
  margin-top: 22px;
}

.music-note {
  position: fixed;
  bottom: 16px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 10px;
  letter-spacing: 1px;
  color: #b99b70;
}

/* Opening animation */
.envelope.open .envelope-front {
  transform: rotateX(180deg);
  transform-origin: top;
  transition: transform 1s;
  z-index: 1;
}

.envelope.open .seal,
.envelope.open ~ .tap-hint {
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s;
}

/* Full-screen invitation */
.envelope-wrap:has(.envelope.open) {
  perspective: none !important;
}

.envelope.open {
  filter: none !important;
}

.envelope.open .letter {
  position: fixed !important;
  top: 50% !important;
  left: 50% !important;
  right: auto !important;
  width: 100vw !important;
  height: 100vh !important;
  height: 100dvh !important;
  transform: translate(-50%, -50%) !important;
  z-index: 1000 !important;
  border-radius: 0;
  overflow-x: hidden;
  overflow-y: auto;
  transition: none;
}

.envelope.open .letter-inner {
  width: 100%;
  min-height: 100%;
  padding: 24px 20px 35px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

/* Smaller screens */
@media (max-width: 600px) {
  .envelope-wrap {
    width: min(92vw, 560px);
  }

  .envelope.open .letter-inner {
    padding: 18px 16px 30px;
  }

  .couple-portrait {
    width: min(72%, 300px);
  }
}

/* Short screens */
@media (max-height: 700px) {
  .envelope-wrap {
    width: min(88vw, 470px);
  }

  .letter-inner {
    padding-top: 10px;
  }

  .story,
  .join {
    line-height: 1.15;
    margin: 4px auto;
  }

  .countdown {
    margin: 4px 0;
  }

  .envelope.open .letter-inner {
    padding-top: 12px;
    padding-bottom: 20px;
  }
}