:root {
  color-scheme: dark;
  --ink: #2f090a;
  --velvet: #52080f;
  --cranberry: #8f0712;
  --red: #c7131f;
  --red-bright: #f03235;
  --red-dark: #72070f;
  --red-deep: #4b0409;
  --coral: #ff6f54;
  --gold-deep: #9f6814;
  --gold-mid: #d99a2b;
  --gold: #f1be55;
  --gold-light: #ffe9a8;
  --paper: #fff1ce;
  --paper-warm: #f3c85e;
  --jade: #1b8e75;
  --shadow: rgba(18, 2, 4, 0.46);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--ink);
}

body {
  min-height: 100svh;
  margin: 0;
  overflow: hidden;
  color: var(--paper);
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
  background:
    radial-gradient(circle at 16% 18%, rgba(255, 213, 111, 0.28), transparent 20rem),
    radial-gradient(circle at 82% 12%, rgba(27, 142, 117, 0.24), transparent 18rem),
    radial-gradient(circle at 50% 86%, rgba(255, 111, 84, 0.2), transparent 26rem),
    linear-gradient(140deg, #320408 0%, #6f0610 43%, #230407 100%);
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
}

body::before {
  opacity: 0.28;
  background-image:
    linear-gradient(115deg, rgba(255, 224, 150, 0.1) 1px, transparent 1px),
    linear-gradient(25deg, rgba(255, 224, 150, 0.08) 1px, transparent 1px);
  background-size: 62px 62px, 86px 86px;
  mask-image: radial-gradient(circle at center, black 0%, transparent 74%);
}

body::after {
  opacity: 0.34;
  background:
    radial-gradient(circle at 20% 70%, rgba(255, 255, 255, 0.16) 0 1px, transparent 2px),
    radial-gradient(circle at 72% 22%, rgba(255, 232, 168, 0.2) 0 1px, transparent 2px),
    radial-gradient(circle at 86% 78%, rgba(255, 232, 168, 0.18) 0 1px, transparent 2px);
  background-size: 120px 120px, 160px 160px, 96px 96px;
  animation: sparkle-drift 16s linear infinite;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.scene {
  position: relative;
  display: grid;
  min-height: 100svh;
  place-items: center;
  padding: clamp(20px, 5vw, 56px);
  isolation: isolate;
}

.experience {
  position: relative;
  width: min(92vw, 620px);
  min-height: min(760px, 88svh);
  display: grid;
  place-items: center;
  --flap-final-y: -24px;
  --flap-final-z: -18px;
  --front-mid-y: 26px;
  --front-final-y: 54px;
  --front-final-z: 38px;
  --front-final-scale-y: 0.88;
  --note-start-y: 118px;
  --note-mid-y: -108px;
  --note-overshoot-y: -138px;
  --note-final-y: -132px;
}

.aura {
  position: absolute;
  width: min(78vw, 560px);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(255, 235, 170, 0.42) 0 8%, transparent 24%),
    conic-gradient(
      from 18deg,
      transparent,
      rgba(255, 221, 133, 0.3),
      transparent,
      rgba(27, 142, 117, 0.14),
      transparent
    );
  filter: blur(22px);
  opacity: 0.74;
  transform: translateY(4%);
  animation: aura-pulse 4.8s ease-in-out infinite;
}

.packet-button {
  position: relative;
  z-index: 3;
  display: block;
  width: min(74vw, 360px);
  height: min(90svh, 640px);
  padding: 0;
  appearance: none;
  cursor: pointer;
  background: transparent;
  border: 0;
  outline: 0;
  perspective: 1300px;
  touch-action: manipulation;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

.packet-button,
.packet-button:active,
.packet-button:focus {
  background: transparent;
}

.packet-button:focus:not(:focus-visible) {
  outline: 0;
}

.packet-button:focus-visible {
  border-radius: 28px;
  outline: 3px solid rgba(255, 232, 168, 0.88);
  outline-offset: 12px;
}

.packet-button:disabled {
  cursor: default;
}

.packet {
  position: absolute;
  inset: auto 0 0;
  height: min(118vw, 520px);
  max-height: 520px;
  min-height: 390px;
  transform-style: preserve-3d;
  transition: transform 460ms cubic-bezier(0.2, 0.85, 0.28, 1.2);
  will-change: transform;
}

.packet-button:hover .packet,
.packet-button:focus-visible .packet {
  transform: translateY(-10px) rotateX(2deg) rotateZ(-0.45deg);
}

.packet-shadow,
.packet-back,
.packet-mouth,
.packet-front,
.flap,
.gift-note,
.seal {
  position: absolute;
  left: 50%;
  display: block;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  will-change: transform, opacity;
}

.packet-button * {
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

.packet-shadow {
  z-index: 0;
  right: 2%;
  bottom: -5%;
  left: 2%;
  height: 17%;
  opacity: 0.72;
  background: radial-gradient(ellipse at center, rgba(18, 1, 5, 0.56), transparent 68%);
  filter: blur(18px);
  transform: translateZ(-72px);
}

.packet-back {
  z-index: 1;
  bottom: 0;
  width: 78%;
  height: 86%;
  overflow: hidden;
  border: 1px solid rgba(255, 232, 168, 0.38);
  border-radius: 20px 20px 30px 30px;
  background:
    linear-gradient(112deg, rgba(255, 255, 255, 0.2), transparent 24%),
    radial-gradient(circle at 52% 18%, rgba(255, 205, 94, 0.18), transparent 34%),
    linear-gradient(90deg, rgba(70, 2, 8, 0.22), transparent 16%, transparent 84%, rgba(58, 2, 8, 0.25)),
    repeating-linear-gradient(0deg, transparent 0 31px, rgba(255, 224, 147, 0.055) 31px 32px),
    linear-gradient(180deg, #f0393b 0%, #bd0b18 58%, var(--red-dark) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 238, 186, 0.32),
    inset 0 -30px 50px rgba(56, 1, 6, 0.42),
    inset 18px 0 30px rgba(255, 111, 84, 0.08),
    inset -18px 0 30px rgba(40, 1, 6, 0.16);
  transform: translateX(-50%);
}

.packet-back::before,
.packet-back::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
}

.packet-back::before {
  opacity: 0.34;
  background:
    radial-gradient(ellipse at 50% -10%, rgba(255, 230, 153, 0.34), transparent 42%),
    linear-gradient(100deg, transparent 0 42%, rgba(255, 225, 150, 0.16) 43% 45%, transparent 46%),
    linear-gradient(80deg, transparent 0 55%, rgba(58, 1, 8, 0.18) 56% 58%, transparent 59%);
}

.packet-back::after {
  opacity: 0.5;
  background:
    linear-gradient(32deg, transparent 0 49.4%, rgba(255, 225, 150, 0.14) 49.7% 50.4%, transparent 50.7%),
    linear-gradient(148deg, transparent 0 49.4%, rgba(65, 1, 7, 0.2) 49.7% 50.4%, transparent 50.7%);
  mask-image: linear-gradient(180deg, transparent 0 16%, black 35%, black 100%);
}

.inner-glow {
  position: absolute;
  inset: 18px 24px auto;
  height: 45%;
  border-radius: 0 0 48% 48%;
  background: radial-gradient(ellipse at center, rgba(255, 229, 151, 0.72), transparent 68%);
  filter: blur(12px);
  opacity: 0.28;
}

.packet-mouth {
  z-index: 3;
  top: 20%;
  width: 78%;
  height: 13%;
  overflow: hidden;
  border-radius: 46% 46% 18px 18px / 30% 30% 18px 18px;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(255, 222, 132, 0.32), transparent 45%),
    linear-gradient(180deg, var(--red-deep) 0%, #7f0810 58%, #d31621 100%);
  border: 1px solid rgba(255, 222, 142, 0.22);
  box-shadow:
    inset 0 14px 26px rgba(20, 0, 4, 0.56),
    inset 0 -2px 0 rgba(255, 224, 147, 0.28),
    0 10px 18px rgba(42, 0, 4, 0.22);
  transform: translateX(-50%) translateZ(24px);
}

.packet-mouth::before {
  position: absolute;
  inset: 0 6% auto;
  height: 46%;
  border-radius: 0 0 48% 48%;
  background: linear-gradient(180deg, rgba(20, 0, 4, 0.72), transparent);
  content: "";
}

.mouth-glow {
  position: absolute;
  right: 18%;
  bottom: -36%;
  left: 18%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(255, 220, 128, 0.44), transparent 68%);
  filter: blur(8px);
}

.flap {
  z-index: 5;
  top: 4%;
  width: 78%;
  height: 34%;
  overflow: hidden;
  border-radius: 20px 20px 10px 10px;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.26), transparent 28%),
    radial-gradient(circle at 55% 30%, rgba(255, 220, 120, 0.12), transparent 32%),
    linear-gradient(90deg, rgba(89, 2, 10, 0.18), transparent 18%, transparent 82%, rgba(72, 2, 9, 0.2)),
    linear-gradient(180deg, #ff4b44 0%, #e71926 48%, #a80614 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 236, 178, 0.42),
    inset 0 -18px 28px rgba(59, 0, 7, 0.26),
    0 14px 26px rgba(80, 0, 8, 0.24);
  clip-path: polygon(0 4%, 100% 4%, 91% 70%, 50% 100%, 9% 70%);
  transform: translateX(-50%) translateZ(48px) rotateX(0deg);
  transform-origin: 50% 4%;
  transition:
    transform 1200ms cubic-bezier(0.16, 0.85, 0.23, 1),
    opacity 700ms ease;
  backface-visibility: visible;
  -webkit-backface-visibility: visible;
}

.flap-underside {
  position: absolute;
  inset: 0;
  opacity: 0.82;
  background:
    radial-gradient(ellipse at 50% 88%, rgba(255, 222, 132, 0.3), transparent 40%),
    linear-gradient(180deg, rgba(116, 7, 12, 0.34), rgba(58, 1, 6, 0.2)),
    repeating-linear-gradient(90deg, transparent 0 34px, rgba(255, 232, 166, 0.08) 34px 35px);
}

.flap-pattern {
  position: absolute;
  inset: 6% 12% 18%;
  opacity: 0.68;
  background:
    radial-gradient(circle at center, transparent 0 28%, rgba(255, 232, 166, 0.9) 29% 31%, transparent 32%),
    radial-gradient(circle at center, rgba(255, 232, 166, 0.12) 0 2px, transparent 3px),
    repeating-conic-gradient(
      from 8deg,
      transparent 0 12deg,
      rgba(255, 231, 166, 0.24) 12deg 15deg,
      transparent 15deg 32deg
    );
  border-radius: 50%;
}

.flap-edge {
  position: absolute;
  right: 13%;
  bottom: 4%;
  left: 13%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 232, 166, 0.74), transparent);
  filter: drop-shadow(0 1px 2px rgba(60, 1, 7, 0.22));
}

.packet-front {
  z-index: 4;
  bottom: 0;
  width: 78%;
  height: 78%;
  overflow: hidden;
  border: 1px solid rgba(255, 232, 168, 0.5);
  border-radius: 16px 16px 30px 30px;
  background:
    linear-gradient(130deg, rgba(255, 255, 255, 0.22), transparent 24%),
    radial-gradient(circle at 50% 38%, rgba(255, 207, 102, 0.18), transparent 36%),
    linear-gradient(90deg, rgba(84, 2, 10, 0.2), transparent 14%, transparent 86%, rgba(61, 1, 8, 0.22)),
    linear-gradient(180deg, #f33135 0%, #c80d1b 56%, #820812 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 238, 186, 0.46),
    inset 0 -30px 48px rgba(66, 0, 8, 0.4),
    inset 22px 0 36px rgba(255, 111, 84, 0.08),
    inset -22px 0 36px rgba(42, 1, 7, 0.2);
  transform: translateX(-50%) translateZ(52px);
  transition:
    transform 950ms cubic-bezier(0.18, 0.8, 0.2, 1),
    opacity 700ms ease;
}

.packet-front::before,
.packet-front::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
}

.packet-front::before {
  opacity: 0.34;
  background:
    radial-gradient(ellipse at 50% -8%, rgba(255, 236, 180, 0.3), transparent 34%),
    linear-gradient(35deg, transparent 0 49%, rgba(255, 224, 147, 0.12) 49.2% 49.8%, transparent 50%),
    linear-gradient(145deg, transparent 0 49%, rgba(75, 1, 8, 0.2) 49.2% 49.8%, transparent 50%);
}

.packet-front::after {
  opacity: 0.28;
  background:
    linear-gradient(180deg, transparent 0 62%, rgba(255, 77, 64, 0.22) 63%, transparent 72%),
    radial-gradient(ellipse at 50% 100%, rgba(28, 0, 4, 0.34), transparent 52%);
}

.front-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.34;
  background:
    radial-gradient(circle at 50% 44%, transparent 0 25%, rgba(255, 218, 128, 0.72) 26% 27.5%, transparent 28.5%),
    radial-gradient(circle at 50% 44%, rgba(255, 218, 128, 0.12) 0 2px, transparent 3px),
    repeating-linear-gradient(90deg, transparent 0 28px, rgba(255, 224, 147, 0.13) 28px 29px),
    repeating-linear-gradient(0deg, transparent 0 32px, rgba(255, 224, 147, 0.1) 32px 33px);
}

.side-fold {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 1;
  width: 22%;
  opacity: 0.42;
  pointer-events: none;
}

.side-fold-left {
  left: 0;
  background:
    linear-gradient(100deg, rgba(70, 1, 8, 0.34), transparent 70%),
    linear-gradient(42deg, transparent 0 49%, rgba(255, 224, 147, 0.12) 50%, transparent 51%);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

.side-fold-right {
  right: 0;
  background:
    linear-gradient(260deg, rgba(45, 1, 7, 0.34), transparent 72%),
    linear-gradient(138deg, transparent 0 49%, rgba(255, 224, 147, 0.12) 50%, transparent 51%);
  clip-path: polygon(100% 0, 0 50%, 100% 100%);
}

.front-foil {
  position: absolute;
  right: 10%;
  left: 10%;
  z-index: 2;
  height: 42px;
  opacity: 0.52;
  background:
    radial-gradient(ellipse at 10% 50%, rgba(255, 232, 166, 0.92) 0 2px, transparent 3px),
    radial-gradient(ellipse at 90% 50%, rgba(255, 232, 166, 0.92) 0 2px, transparent 3px),
    linear-gradient(90deg, transparent, rgba(255, 232, 166, 0.64), transparent);
  mask-image: radial-gradient(ellipse at 50% 100%, transparent 0 56%, black 57% 60%, transparent 61%);
}

.front-foil-top {
  top: 12%;
}

.front-foil-bottom {
  bottom: 12%;
  transform: rotate(180deg);
}

.corner {
  z-index: 3;
  position: absolute;
  width: 58px;
  aspect-ratio: 1;
  border: 2px solid rgba(255, 229, 160, 0.72);
  filter: drop-shadow(0 1px 1px rgba(80, 0, 8, 0.18));
}

.corner-top-left {
  top: 16px;
  left: 16px;
  border-right: 0;
  border-bottom: 0;
  border-radius: 13px 0 0;
}

.corner-top-right {
  top: 16px;
  right: 16px;
  border-bottom: 0;
  border-left: 0;
  border-radius: 0 13px 0 0;
}

.corner-bottom-left {
  bottom: 16px;
  left: 16px;
  border-top: 0;
  border-right: 0;
  border-radius: 0 0 0 13px;
}

.corner-bottom-right {
  right: 16px;
  bottom: 16px;
  border-top: 0;
  border-left: 0;
  border-radius: 0 0 13px;
}

.crest {
  z-index: 4;
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  width: min(24vw, 106px);
  aspect-ratio: 1;
  place-items: center;
  color: #7d0710;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.25rem, 11.5vw, 5.7rem);
  font-weight: 700;
  line-height: 1;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.22);
  background:
    radial-gradient(circle at 34% 26%, #fff1bd 0 7%, transparent 8%),
    conic-gradient(from 24deg, rgba(255, 247, 203, 0.32), transparent 18%, rgba(133, 75, 7, 0.18) 31%, transparent 43%, rgba(255, 247, 203, 0.28) 61%, transparent 84%),
    radial-gradient(circle at 45% 34%, var(--gold-light) 0%, var(--gold) 48%, var(--gold-mid) 70%, var(--gold-deep) 100%);
  border: 1px solid rgba(255, 247, 203, 0.72);
  border-radius: 50%;
  box-shadow:
    0 12px 26px rgba(75, 2, 8, 0.32),
    inset 0 0 0 7px rgba(139, 83, 10, 0.13),
    inset 0 -12px 20px rgba(116, 66, 8, 0.18);
  transform: translate(-50%, -50%);
}

.crest::before,
.crest::after {
  position: absolute;
  border-radius: inherit;
  pointer-events: none;
  content: "";
}

.crest::before {
  inset: 10%;
  border: 2px solid rgba(128, 72, 8, 0.22);
}

.crest::after {
  top: 14%;
  left: 22%;
  width: 22%;
  height: 14%;
  background: rgba(255, 255, 226, 0.6);
  filter: blur(1px);
  transform: rotate(-32deg);
}

.seal {
  z-index: 7;
  top: 34%;
  display: grid;
  width: 62px;
  aspect-ratio: 1;
  place-items: center;
  color: #6e050d;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
  background:
    radial-gradient(circle at 32% 24%, #fff9d4 0 7%, transparent 8%),
    conic-gradient(from -18deg, rgba(255, 247, 203, 0.42), transparent 22%, rgba(132, 75, 7, 0.22) 35%, transparent 58%, rgba(255, 247, 203, 0.36) 82%, transparent),
    radial-gradient(circle at 44% 32%, var(--gold-light), var(--gold) 52%, var(--gold-mid) 76%, var(--gold-deep));
  border: 1px solid rgba(255, 249, 218, 0.82);
  border-radius: 50%;
  box-shadow:
    0 12px 24px rgba(60, 1, 6, 0.34),
    inset 0 0 0 7px rgba(132, 76, 8, 0.12),
    inset 0 -10px 18px rgba(116, 66, 8, 0.16);
  transform: translateX(-50%) translateZ(66px);
  transition:
    transform 700ms cubic-bezier(0.16, 0.76, 0.27, 1),
    opacity 520ms ease;
}

.seal::before,
.seal::after {
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(116, 66, 8, 0.3);
  border-radius: inherit;
  content: "";
}

.seal::after {
  inset: 15px;
  border-color: rgba(116, 66, 8, 0.2);
}

.seal-glint {
  position: absolute;
  top: 18%;
  left: 22%;
  width: 21%;
  height: 15%;
  border-radius: 50%;
  background: rgba(255, 255, 226, 0.72);
  filter: blur(0.5px);
  transform: rotate(-30deg);
}

.seal span {
  position: relative;
  z-index: 1;
}

.gift-note {
  z-index: 2;
  top: 0;
  width: 82%;
  min-height: 56%;
  overflow: hidden;
  display: grid;
  place-items: center;
  padding: clamp(26px, 6.4vw, 42px) clamp(20px, 5.6vw, 34px);
  color: #4d1505;
  text-align: center;
  background:
    linear-gradient(140deg, rgba(255, 255, 255, 0.66), transparent 24%),
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.72), transparent 34%),
    linear-gradient(164deg, rgba(255, 255, 255, 0.34) 0 20%, transparent 20.5%),
    linear-gradient(180deg, #fff8dc 0%, #ffe39d 64%, var(--paper-warm) 100%);
  border: 1px solid rgba(255, 250, 221, 0.78);
  border-radius: 20px;
  box-shadow:
    0 18px 46px rgba(53, 4, 6, 0.28),
    inset 0 0 0 10px rgba(147, 88, 9, 0.07),
    inset 0 -14px 28px rgba(151, 91, 9, 0.1);
  opacity: 0;
  transform: translateX(-50%) translateY(132px) translateZ(18px) rotateX(-7deg) scale(0.72);
  transition:
    transform 1180ms cubic-bezier(0.17, 0.92, 0.18, 1),
    opacity 480ms ease;
}

.note-shine {
  position: absolute;
  inset: -36% -18% auto;
  height: 62%;
  background: linear-gradient(120deg, transparent 18%, rgba(255, 255, 255, 0.66) 48%, transparent 76%);
  transform: rotate(-7deg);
}

.note-border {
  position: absolute;
  inset: 13px;
  border: 2px solid rgba(126, 75, 7, 0.28);
  border-radius: 18px;
}

.gift-message {
  position: relative;
  z-index: 1;
  display: block;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.72rem, 5.7vw, 2.32rem);
  font-weight: 700;
  line-height: 1.08;
  text-wrap: balance;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.62);
}

.confetti-layer {
  position: fixed;
  inset: 0;
  z-index: 4;
  overflow: hidden;
  pointer-events: none;
}

.confetti {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--size);
  height: calc(var(--size) * 1.8);
  border-radius: 3px;
  background: var(--color);
  box-shadow: 0 0 14px rgba(255, 236, 174, 0.34);
  transform: translate(-50%, -50%) rotate(var(--spin));
  animation: burst var(--duration) cubic-bezier(0.12, 0.68, 0.16, 1) forwards;
}

.confetti.round {
  border-radius: 50%;
}

.confetti.spark {
  width: calc(var(--size) * 1.6);
  height: calc(var(--size) * 1.6);
  border-radius: 0;
  background:
    linear-gradient(90deg, transparent 0 42%, var(--color) 43% 57%, transparent 58%),
    linear-gradient(0deg, transparent 0 42%, var(--color) 43% 57%, transparent 58%);
  box-shadow: 0 0 18px rgba(255, 236, 174, 0.58);
}

.lantern {
  position: fixed;
  top: clamp(18px, 5vh, 48px);
  z-index: 0;
  width: clamp(78px, 12vw, 134px);
  aspect-ratio: 0.78;
  opacity: 0.9;
  filter: drop-shadow(0 18px 24px rgba(31, 1, 4, 0.32));
  animation: lantern-sway 5.8s ease-in-out infinite;
  transform-origin: 50% -24px;
}

.lantern::before {
  position: absolute;
  top: -42px;
  left: 50%;
  width: 1px;
  height: 48px;
  background: rgba(255, 221, 139, 0.54);
  content: "";
}

.lantern::after {
  position: absolute;
  inset: 8% 18% 6%;
  border-radius: 50%;
  background:
    linear-gradient(90deg, transparent 0 20%, rgba(255, 239, 177, 0.38) 21% 23%, transparent 24% 76%, rgba(95, 4, 12, 0.18) 77% 80%, transparent 81%),
    radial-gradient(circle at 50% 28%, rgba(255, 249, 197, 0.48), transparent 24%),
    linear-gradient(180deg, #ff5a42 0%, #bd0d18 58%, #740711 100%);
  border: 1px solid rgba(255, 224, 147, 0.5);
  box-shadow: inset 0 -18px 28px rgba(55, 1, 7, 0.28);
  content: "";
}

.lantern span {
  position: absolute;
  right: 27%;
  bottom: -10%;
  left: 27%;
  height: 18%;
  background: linear-gradient(180deg, var(--gold-light), var(--gold-deep));
  clip-path: polygon(18% 0, 82% 0, 100% 100%, 0 100%);
}

.lantern-left {
  left: clamp(16px, 9vw, 120px);
}

.lantern-right {
  right: clamp(16px, 9vw, 120px);
  animation-delay: -2.4s;
}

.experience.is-opening .packet-button .packet {
  transform: translateY(-4px) rotateX(4deg) scale(0.992);
}

.experience.is-opening .seal {
  animation: seal-press 340ms cubic-bezier(0.2, 0.9, 0.24, 1) both;
}

.experience.is-open .packet-button .packet,
.experience.reduced-motion .packet-button .packet {
  transform: translateY(18px) rotateX(0deg);
}

.experience.is-open:not(.reduced-motion) .packet-button .packet {
  animation: packet-open-settle 1500ms cubic-bezier(0.16, 0.85, 0.2, 1) both;
}

.experience.is-open .flap,
.experience.reduced-motion .flap {
  opacity: 0.95;
  transform: translateX(-50%) translateY(var(--flap-final-y)) translateZ(var(--flap-final-z)) rotateX(-172deg);
}

.experience.is-open:not(.reduced-motion) .flap {
  animation: flap-unfold 1320ms cubic-bezier(0.16, 0.8, 0.18, 1) both;
}

.experience.is-open .packet-front,
.experience.reduced-motion .packet-front {
  opacity: 0.88;
  transform: translateX(-50%) translateY(var(--front-final-y)) translateZ(var(--front-final-z)) scaleY(var(--front-final-scale-y));
}

.experience.is-open:not(.reduced-motion) .packet-front {
  animation: front-pocket-settle 1180ms cubic-bezier(0.16, 0.84, 0.22, 1) both;
}

.experience.is-open .seal,
.experience.reduced-motion .seal {
  opacity: 0;
  transform: translateX(-50%) translateY(-28px) translateZ(84px) scale(0.24) rotate(72deg);
}

.experience.is-open:not(.reduced-motion) .seal {
  animation: seal-release 820ms cubic-bezier(0.14, 0.72, 0.3, 1) both;
}

.experience.is-open .gift-note,
.experience.reduced-motion .gift-note {
  z-index: 8;
  opacity: 1;
  transform: translateX(-50%) translateY(var(--note-final-y)) translateZ(72px) rotateX(0deg) scale(1);
  transition-delay: 460ms;
}

.experience.is-open:not(.reduced-motion) .gift-note {
  animation: note-reveal 1380ms 220ms cubic-bezier(0.16, 0.9, 0.18, 1) both;
}

.experience.is-open .aura {
  animation-duration: 2.6s;
  opacity: 0.96;
}

.experience.is-open .packet-mouth {
  box-shadow:
    inset 0 14px 26px rgba(20, 0, 4, 0.62),
    inset 0 -2px 0 rgba(255, 224, 147, 0.34),
    0 14px 22px rgba(42, 0, 4, 0.28);
}

@keyframes sparkle-drift {
  from {
    background-position: 0 0, 0 0, 0 0;
  }

  to {
    background-position: 120px 240px, -160px 160px, 96px -192px;
  }
}

@keyframes aura-pulse {
  0%,
  100% {
    transform: translateY(4%) scale(0.97);
  }

  50% {
    transform: translateY(1%) scale(1.04);
  }
}

@keyframes lantern-sway {
  0%,
  100% {
    transform: rotate(-2deg);
  }

  50% {
    transform: rotate(2.8deg);
  }
}

@keyframes seal-press {
  0% {
    transform: translateX(-50%) translateZ(66px) scale(1);
  }

  58% {
    transform: translateX(-50%) translateY(5px) translateZ(58px) scale(0.9);
  }

  100% {
    transform: translateX(-50%) translateY(-2px) translateZ(70px) scale(1.04);
  }
}

@keyframes seal-release {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(-2px) translateZ(70px) scale(1.04) rotate(0deg);
  }

  38% {
    opacity: 1;
    transform: translateX(-50%) translateY(-34px) translateZ(92px) scale(0.78) rotate(-18deg);
  }

  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(-78px) translateZ(110px) scale(0.18) rotate(120deg);
  }
}

@keyframes flap-unfold {
  0% {
    transform: translateX(-50%) translateZ(48px) rotateX(0deg);
  }

  26% {
    transform: translateX(-50%) translateY(-7px) translateZ(72px) rotateX(-34deg);
  }

  58% {
    transform: translateX(-50%) translateY(-25px) translateZ(22px) rotateX(-142deg);
  }

  78% {
    transform: translateX(-50%) translateY(-26px) translateZ(-20px) rotateX(-178deg);
  }

  100% {
    transform: translateX(-50%) translateY(var(--flap-final-y)) translateZ(var(--flap-final-z)) rotateX(-172deg);
  }
}

@keyframes front-pocket-settle {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateZ(52px) scaleY(1);
  }

  52% {
    opacity: 0.94;
    transform: translateX(-50%) translateY(var(--front-mid-y)) translateZ(48px) scaleY(0.95);
  }

  100% {
    opacity: 0.88;
    transform: translateX(-50%) translateY(var(--front-final-y)) translateZ(var(--front-final-z)) scaleY(var(--front-final-scale-y));
  }
}

@keyframes packet-open-settle {
  0% {
    transform: translateY(-4px) rotateX(4deg) scale(0.992);
  }

  48% {
    transform: translateY(10px) rotateX(-1deg) scale(1.018);
  }

  100% {
    transform: translateY(18px) rotateX(0deg) scale(1);
  }
}

@keyframes note-reveal {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(var(--note-start-y)) translateZ(18px) rotateX(-8deg) scale(0.72);
  }

  42% {
    opacity: 1;
    transform: translateX(-50%) translateY(var(--note-mid-y)) translateZ(80px) rotateX(3deg) scale(1.035);
  }

  72% {
    transform: translateX(-50%) translateY(var(--note-overshoot-y)) translateZ(74px) rotateX(-1deg) scale(0.992);
  }

  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(var(--note-final-y)) translateZ(72px) rotateX(0deg) scale(1);
  }
}

@keyframes burst {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.4) rotate(var(--spin));
  }

  9% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform:
      translate(
        calc(-50% + var(--x)),
        calc(-50% + var(--y) + 24vh)
      )
      scale(var(--scale))
      rotate(calc(var(--spin) + var(--turn)));
  }
}

@media (max-width: 760px) {
  body {
    overflow: hidden;
  }

  .scene {
    padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
    place-items: start center;
  }

  .experience {
    width: 100%;
    min-height: 100svh;
    place-items: start center;
    --flap-final-y: -14px;
    --flap-final-z: -12px;
    --front-mid-y: 16px;
    --front-final-y: 28px;
    --front-final-z: 34px;
    --front-final-scale-y: 0.82;
    --note-start-y: 98px;
    --note-mid-y: -82px;
    --note-overshoot-y: -107px;
    --note-final-y: -102px;
  }

  .packet-button {
    width: min(76vw, 324px);
    height: min(84svh, 560px);
    margin-top: 52px;
  }

  .packet {
    height: min(108vw, 430px);
    min-height: 384px;
  }

  .gift-note {
    width: 82%;
    min-height: 54%;
    padding: 22px 18px;
    border-radius: 20px;
  }

  .gift-message {
    font-size: clamp(1.36rem, 6.55vw, 1.9rem);
    line-height: 1.05;
  }

  .crest {
    width: min(23vw, 92px);
  }

  .seal {
    width: 54px;
    font-size: 1.3rem;
  }

  .lantern {
    width: 70px;
    opacity: 0.52;
  }

  .lantern-left {
    left: 8px;
  }

  .lantern-right {
    right: 8px;
  }

  .experience.is-open .gift-note,
  .experience.reduced-motion .gift-note {
    transform: translateX(-50%) translateY(var(--note-final-y)) translateZ(72px) rotateX(0deg) scale(1);
  }
}

@media (max-width: 390px) {
  .packet-button {
    width: min(76vw, 300px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}