:root {
  --saffron: #dd8d24;
  --marigold: #f4c35d;
  --rose: #e96082;
  --ink: #4b2f35;
  --paper: #fffaf8;
  --paper-deep: #ffe7ee;
  --teal: #cc5f7c;
  --night: #fff0f5;
  --shadow: rgba(114, 54, 76, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 220, 232, 0.95), transparent 32%),
    radial-gradient(circle at bottom right, rgba(255, 212, 227, 0.9), transparent 28%),
    linear-gradient(135deg, rgba(255, 248, 251, 0.98), rgba(255, 239, 245, 0.96)),
    url("./assets/rangoli.svg"),
    #fff3f7;
  background-size: cover, cover, cover, 420px, auto;
  background-position: center, center, center, center top, center;
  overflow-x: hidden;
}

button {
  font: inherit;
}

.stage {
  position: relative;
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 40px 18px;
  isolation: isolate;
}

.stage::before {
  position: absolute;
  inset: 0;
  z-index: -2;
  content: "";
  background-image:
    linear-gradient(rgba(233, 96, 130, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 96, 130, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
}

.rangoli {
  position: fixed;
  width: 250px;
  aspect-ratio: 1;
  border: 2px solid rgba(244, 195, 93, 0.4);
  border-radius: 50%;
  opacity: 0.7;
  pointer-events: none;
}

.rangoli::before,
.rangoli::after {
  position: absolute;
  inset: 16%;
  content: "";
  border: 2px solid rgba(255, 255, 255, 0.55);
  transform: rotate(45deg);
}

.rangoli::after {
  inset: 32%;
  border-color: rgba(233, 96, 130, 0.32);
  transform: rotate(22deg);
}

.rangoli-left {
  bottom: 26px;
  left: -78px;
}

.rangoli-right {
  top: 22px;
  right: -82px;
}

.intro {
  position: absolute;
  top: clamp(24px, 6vh, 56px);
  left: 50%;
  width: min(720px, calc(100% - 36px));
  text-align: center;
  transform: translateX(-50%);
  transition: opacity 450ms ease, transform 450ms ease;
}

.eyebrow {
  margin: 0 0 10px;
  color: #d88b2b;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: #e85f84;
  font-family: Caveat, cursive;
  font-size: clamp(2.8rem, 7vw, 5.7rem);
  font-weight: 700;
  line-height: 0.94;
  text-shadow: 0 14px 36px rgba(0, 0, 0, 0.2);
}

.intro-copy {
  max-width: 560px;
  margin: 16px auto 0;
  color: rgba(102, 54, 69, 0.8);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
}

.letter-scene {
  position: relative;
  display: grid;
  width: min(900px, 100%);
  min-height: 660px;
  place-items: center;
  perspective: 1800px;
}

.envelope {
  position: relative;
  width: min(580px, 88vw);
  aspect-ratio: 1.52;
  margin-top: 110px;
  border: 0;
  background: transparent;
  cursor: pointer;
  filter: drop-shadow(0 24px 32px var(--shadow));
  transform-style: preserve-3d;
  transition: transform 550ms ease, opacity 350ms ease;
}

.envelope:hover {
  transform: translateY(-8px) rotateX(3deg);
}

.flap,
.pocket,
.paper-peek {
  position: absolute;
  inset: 0;
  display: block;
}

.back-flap {
  background: #f2ba6c;
  clip-path: polygon(0 0, 50% 56%, 100% 0);
  transform-origin: top center;
  transition: transform 850ms cubic-bezier(0.2, 0.9, 0.2, 1);
}

.paper-peek {
  inset: 11% 12% 26%;
  display: grid;
  place-items: start center;
  padding-top: 18px;
  color: #cf6784;
  font-family: Caveat, cursive;
  font-size: clamp(2rem, 7vw, 4rem);
  background: linear-gradient(180deg, #fffdfd, #ffeef3);
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px rgba(49, 34, 28, 0.08);
  transform: translateY(18%);
  transition: transform 850ms 180ms cubic-bezier(0.2, 0.9, 0.2, 1);
}

.left-pocket,
.right-pocket {
  background: #e39255;
  clip-path: polygon(0 0, 50% 50%, 0 100%);
}

.right-pocket {
  background: #d98346;
  clip-path: polygon(100% 0, 50% 50%, 100% 100%);
}

.front-flap {
  background: linear-gradient(145deg, #f4c06d, #df8c4c);
  clip-path: polygon(0 100%, 50% 42%, 100% 100%);
}

.seal {
  position: absolute;
  left: 50%;
  top: 57%;
  display: grid;
  width: 76px;
  aspect-ratio: 1;
  place-items: center;
  color: #fffdf8;
  font-size: 2rem;
  background: var(--rose);
  border: 4px solid rgba(244, 195, 93, 0.45);
  border-radius: 50%;
  box-shadow: 0 10px 18px rgba(85, 32, 34, 0.32);
  transform: translate(-50%, -50%);
  transition: opacity 300ms ease, transform 600ms ease;
}

.letter {
  position: absolute;
  top: 32px;
  width: min(720px, calc(100vw - 26px));
  min-height: 640px;
  background: var(--paper);
  border: 1px solid rgba(214, 120, 149, 0.16);
  border-radius: 6px;
  box-shadow: 0 30px 70px rgba(22, 14, 10, 0.35);
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transform: translateY(140px) rotateX(72deg) scale(0.72);
  transform-origin: center top;
  transform-style: preserve-3d;
  transition:
    opacity 250ms 650ms ease,
    transform 1050ms 650ms cubic-bezier(0.15, 0.95, 0.18, 1);
}

.letter::before {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.28), rgba(255, 222, 233, 0.1));
  pointer-events: none;
}

.fold {
  position: absolute;
  left: 0;
  width: 100%;
  height: 34%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(255, 219, 231, 0.18));
  backface-visibility: hidden;
  transform-origin: center bottom;
  transform: rotateX(0deg);
  transition:
    transform 900ms 1200ms cubic-bezier(0.2, 0.9, 0.2, 1),
    opacity 250ms 1800ms ease;
}

.fold-top {
  top: 0;
  z-index: 4;
}

.fold-bottom {
  bottom: 0;
  z-index: 4;
  transform-origin: center top;
}

.letter-content {
  position: relative;
  z-index: 2;
  padding: clamp(28px, 5vw, 56px);
  font-family: Caveat, cursive;
  font-size: clamp(1.45rem, 3.1vw, 2rem);
  line-height: 1.12;
}

.letter-content header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
}

.date {
  order: 2;
  margin: 5px 0 0;
  color: var(--rose);
  font-family: Inter, sans-serif;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h2,
h3,
p {
  margin-top: 0;
}

h2 {
  margin-bottom: 18px;
  color: var(--teal);
  font-size: clamp(2.3rem, 7vw, 4.4rem);
  line-height: 0.86;
}

.gift-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
  font-family: Inter, sans-serif;
}

.gift-grid div {
  display: grid;
  min-height: 116px;
  align-content: center;
  gap: 4px;
  padding: 18px;
  background: rgba(255, 230, 238, 0.55);
  border: 1px solid rgba(214, 120, 149, 0.18);
  border-radius: 8px;
}

.ticker {
  color: var(--rose);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.gift-grid strong {
  color: var(--teal);
  font-size: clamp(2rem, 6vw, 3.3rem);
  line-height: 1;
}

.gift-grid small {
  color: rgba(75, 47, 53, 0.72);
  font-size: 0.85rem;
  font-weight: 700;
}

.parent-note {
  padding: 18px 20px;
  background: rgba(255, 236, 242, 0.58);
  border: 1px dashed rgba(233, 96, 130, 0.38);
  border-radius: 8px;
  font-family: Inter, sans-serif;
  font-size: 0.94rem;
  line-height: 1.45;
}

.parent-note h3 {
  margin-bottom: 10px;
  color: var(--teal);
  font-family: Inter, sans-serif;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

ol {
  margin: 0;
  padding-left: 20px;
}

li + li {
  margin-top: 7px;
}

a {
  color: var(--teal);
  font-weight: 800;
}

.fine-print {
  margin: 12px 0 0;
  color: rgba(49, 34, 28, 0.72);
  font-size: 0.82rem;
}

.side-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(233, 96, 130, 0.2);
}

footer {
  margin-top: 24px;
}

.signature {
  margin: 5px 0 0;
  color: var(--rose);
  font-size: inherit;
  font-weight: 700;
  line-height: 1.12;
}

.signature span {
  display: block;
}

.signature-name {
  margin-top: 18px;
  text-align: left;
  color: var(--teal);
  font-size: clamp(1.3rem, 3.6vw, 2rem);
}

.reset {
  position: fixed;
  right: 18px;
  bottom: 18px;
  min-height: 44px;
  padding: 0 18px;
  color: #fffaf8;
  background: rgba(233, 96, 130, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.48);
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 12px 24px rgba(22, 14, 10, 0.28);
}

.stage.open .intro {
  opacity: 0;
  transform: translate(-50%, -20px);
  pointer-events: none;
}

.stage.open .envelope {
  opacity: 0;
  pointer-events: none;
  transform: translateY(220px) rotateX(-12deg) scale(0.86);
  transition-delay: 1250ms;
}

.stage.open .back-flap {
  transform: rotateX(178deg);
}

.stage.open .paper-peek {
  transform: translateY(-68%);
}

.stage.open .seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.7);
}

.stage.open .letter {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) rotateX(0deg) scale(1);
}

.stage.open .fold-top {
  opacity: 0;
  transform: rotateX(-176deg);
}

.stage.open .fold-bottom {
  opacity: 0;
  transform: rotateX(176deg);
}

.stage.closing .intro {
  opacity: 0;
  transform: translate(-50%, -20px);
  pointer-events: none;
}

.stage.closing .envelope {
  opacity: 1;
  pointer-events: none;
  transform: translateY(24px) rotateX(0deg) scale(0.96);
  transition:
    opacity 260ms 220ms ease,
    transform 500ms 220ms cubic-bezier(0.2, 0.85, 0.25, 1);
}

.stage.closing .back-flap {
  transform: rotateX(178deg);
  transition-delay: 0ms;
}

.stage.closing .paper-peek {
  transform: translateY(-68%);
  transition-delay: 0ms;
}

.stage.closing .seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.7);
}

.stage.closing .letter {
  opacity: 0;
  pointer-events: none;
  transform: translateY(140px) rotateX(72deg) scale(0.72);
  transition:
    opacity 180ms 520ms ease,
    transform 620ms cubic-bezier(0.45, 0, 0.2, 1);
}

.stage.closing .fold-top,
.stage.closing .fold-bottom {
  opacity: 1;
  transition:
    transform 620ms cubic-bezier(0.45, 0, 0.2, 1),
    opacity 120ms ease;
}

.stage.closing-envelope .intro {
  opacity: 1;
  transform: translateX(-50%);
  transition:
    opacity 320ms 620ms ease,
    transform 320ms 620ms ease;
}

.stage.closing-envelope .paper-peek {
  transform: translateY(30%);
  transition:
    transform 460ms cubic-bezier(0.32, 0.02, 0.16, 1);
}

.stage.closing-envelope .back-flap {
  transform: rotateX(0deg);
  transition:
    transform 420ms 120ms cubic-bezier(0.35, 0, 0.2, 1);
}

.stage.closing-envelope .seal {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  transition:
    opacity 220ms 460ms ease,
    transform 320ms 460ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (max-width: 760px) {
  .stage {
    padding: 24px 12px 88px;
    place-items: start center;
  }

  .letter-scene {
    min-height: 780px;
  }

  .intro {
    top: 18px;
  }

  .envelope {
    margin-top: 108px;
  }

  .letter {
    top: 18px;
    min-height: 0;
  }

  .letter-content header {
    display: block;
  }

  .date {
    margin-bottom: 12px;
  }

  .gift-grid {
    grid-template-columns: 1fr;
  }
}

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