:root {
  --rose-50: #fff9f8;
  --rose-100: #fdecee;
  --rose-200: #f7d6dc;
  --rose-300: #ecb9c4;
  --rose-500: #c96378;
  --rose-600: #ad455e;
  --wine: #703342;
  --cream: #fffaf0;
  --ink: #5d3540;
  --paper-shadow: rgba(112, 51, 66, 0.2);
  --soft-shadow: rgba(128, 66, 80, 0.15);
  --envelope-width: min(34rem, 88vw);
  --envelope-height: calc(var(--envelope-width) * 0.61);
  --letter-open-y: -64%;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  background:
    radial-gradient(circle at 18% 18%, rgba(255, 255, 255, 0.88) 0 2px, transparent 3px),
    radial-gradient(circle at 83% 12%, rgba(255, 255, 255, 0.68) 0 1px, transparent 2px),
    linear-gradient(145deg, #fff8f4 0%, #f8e1e4 48%, #f5d4db 100%);
  background-size: 48px 48px, 38px 38px, auto;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -3;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(115deg, transparent 0 48%, rgba(143, 70, 84, 0.025) 49% 51%, transparent 52%),
    linear-gradient(35deg, transparent 0 48%, rgba(255, 255, 255, 0.16) 49% 51%, transparent 52%);
  background-size: 72px 72px;
}

button {
  font: inherit;
}

.page-glow {
  position: fixed;
  top: 40%;
  left: 50%;
  z-index: -2;
  width: min(50rem, 110vw);
  aspect-ratio: 1;
  pointer-events: none;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.76), transparent 67%);
  transform: translate(-50%, -50%);
}

.experience {
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  place-items: start center;
  padding: max(2rem, env(safe-area-inset-top)) 1rem max(2rem, env(safe-area-inset-bottom));
}

.intro {
  position: relative;
  z-index: 20;
  width: min(38rem, 100%);
  text-align: center;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--rose-600);
  font-family: "Segoe UI", sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--wine);
  font-family: "Segoe Script", "Bradley Hand", cursive;
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 600;
  line-height: 1.18;
  text-shadow: 0 2px 0 rgba(255, 255, 255, 0.8);
}

h1 span {
  display: inline-block;
  font-family: sans-serif;
  font-size: 0.74em;
  transform: rotate(5deg);
}

.hint {
  margin: 0.65rem 0 0;
  color: #8a6570;
  font-size: clamp(0.92rem, 3vw, 1.05rem);
  font-style: italic;
}

.scene {
  position: relative;
  display: flex;
  width: min(44rem, 100%);
  min-height: clamp(34rem, 72vh, 42rem);
  flex-direction: column;
  align-items: center;
}

.envelope-wrap {
  position: relative;
  z-index: 5;
  width: var(--envelope-width);
  height: calc(var(--envelope-height) + clamp(13rem, 42vw, 19rem));
  margin-top: 0.4rem;
  perspective: 1200px;
}

.envelope {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: var(--envelope-width);
  height: var(--envelope-height);
  cursor: pointer;
  filter: drop-shadow(0 1.4rem 1.3rem rgba(112, 51, 66, 0.18));
  transform: translateX(-50%);
  transform-style: preserve-3d;
}

.envelope__back {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  border: 1px solid rgba(174, 92, 109, 0.25);
  border-radius: 0.75rem;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.5), transparent 38%),
    var(--rose-200);
  box-shadow: inset 0 0 1.8rem rgba(174, 92, 109, 0.08);
}

.envelope__back::after {
  position: absolute;
  inset: 0;
  content: "";
  opacity: 0.3;
  background-image: radial-gradient(rgba(137, 65, 80, 0.22) 0.6px, transparent 0.6px);
  background-size: 7px 7px;
}

.letter-slot {
  position: absolute;
  inset: 0;
  z-index: 2;
  overflow: hidden;
  border-radius: 0.75rem;
  pointer-events: none;
}

.letter {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  z-index: 1;
  display: grid;
  width: 84%;
  min-height: calc(var(--envelope-height) * 1.12);
  margin: 0;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(178, 135, 112, 0.22);
  border-radius: 0.35rem;
  color: var(--ink);
  background:
    linear-gradient(rgba(255, 253, 246, 0.92), rgba(255, 250, 240, 0.96)),
    repeating-linear-gradient(0deg, transparent 0 25px, rgba(132, 82, 67, 0.035) 26px);
  box-shadow: 0 0.35rem 1rem var(--paper-shadow);
  opacity: 0;
  transform: translateX(-50%) scale(0.94);
  transform-origin: bottom center;
}

.letter::before {
  position: absolute;
  inset: 0.75rem;
  border: 1px solid rgba(197, 120, 134, 0.18);
  border-radius: 0.2rem;
  content: "";
  pointer-events: none;
}

.letter__content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 2rem 1.4rem 1.8rem;
  text-align: center;
}


.declaration {
  margin: 0;
  font-family: "Segoe Script", "Bradley Hand", cursive;
  font-size: clamp(1.35rem, 5vw, 2.2rem);
  line-height: 1.35;
}

.declaration strong {
  display: inline-block;
  color: var(--rose-600);
  font-size: 1.05em;
  font-weight: 600;
}

.declaration__ending {
  display: inline-block;
  margin-top: 0.2rem;
  color: #7f5360;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.58em;
  font-style: italic;
  line-height: 1.3;
}

.flourish {
  display: flex;
  width: min(14rem, 75%);
  margin: 0.85rem auto 0.65rem;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  color: var(--rose-500);
}

.flourish span {
  width: 40%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rose-300));
}

.flourish span:last-child {
  background: linear-gradient(90deg, var(--rose-300), transparent);
}

.flourish b {
  font-family: sans-serif;
  font-size: 0.7rem;
}

.signature {
  margin: 0;
  font-size: clamp(0.9rem, 3vw, 1.1rem);
  font-style: italic;
}

.letter__corner {
  position: absolute;
  z-index: 1;
  color: rgba(201, 99, 120, 0.22);
  font-family: sans-serif;
  font-size: 1.25rem;
}

.letter__corner--top {
  top: 1.05rem;
  right: 1.15rem;
}

.letter__corner--bottom {
  bottom: 1.05rem;
  left: 1.15rem;
  transform: rotate(180deg);
}

.envelope__front {
  position: absolute;
  inset: 0;
  z-index: 3;
  overflow: hidden;
  border-radius: 0 0 0.75rem 0.75rem;
}

.envelope__front::before,
.envelope__front::after {
  position: absolute;
  bottom: 0;
  width: 68%;
  height: 100%;
  content: "";
  background: linear-gradient(155deg, #f9e1e5, #efc4cc);
}

.envelope__front::before {
  left: 0;
  clip-path: polygon(0 0, 100% 100%, 0 100%);
}

.envelope__front::after {
  right: 0;
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  background: linear-gradient(205deg, #f8dfe3, #eebdc7);
}

.envelope__flap {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 5;
  width: 100%;
  height: 64%;
  border-radius: 0.75rem 0.75rem 0 0;
  background: linear-gradient(180deg, #fbe6e9, #efc1ca);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transform-style: preserve-3d;
}

.envelope__flap::after {
  position: absolute;
  inset: 0;
  content: "";
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.32), transparent 65%);
  clip-path: inherit;
}

.wax-seal {
  position: absolute;
  top: 51%;
  left: 50%;
  z-index: 6;
  display: grid;
  width: clamp(2.4rem, 9vw, 3.4rem);
  aspect-ratio: 1;
  place-items: center;
  border: 0.22rem double rgba(255, 211, 218, 0.58);
  border-radius: 50%;
  color: #ffe6ea;
  background:
    radial-gradient(circle at 34% 28%, rgba(255, 255, 255, 0.2), transparent 22%),
    linear-gradient(145deg, #ce6a7e, #a63d55);
  box-shadow: 0 0.25rem 0.6rem rgba(112, 51, 66, 0.28);
  font-family: "Segoe Script", cursive;
  font-size: clamp(0.9rem, 3vw, 1.25rem);
  transform: translate(-50%, -50%) rotate(-7deg);
}

.open-button {
  position: relative;
  z-index: 20;
  display: inline-flex;
  min-height: 3rem;
  margin-top: 1.05rem;
  padding: 0.75rem 1.35rem;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border: 1px solid rgba(173, 69, 94, 0.2);
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, #cd7184, var(--rose-600));
  box-shadow: 0 0.65rem 1.4rem rgba(173, 69, 94, 0.24), inset 0 1px rgba(255, 255, 255, 0.38);
  cursor: pointer;
  font-family: "Segoe UI", sans-serif;
  font-size: 0.94rem;
  font-weight: 650;
  letter-spacing: 0.025em;
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease;
  -webkit-tap-highlight-color: transparent;
}

.open-button:hover {
  box-shadow: 0 0.85rem 1.7rem rgba(173, 69, 94, 0.29), inset 0 1px rgba(255, 255, 255, 0.4);
  filter: brightness(1.03);
  transform: translateY(-2px);
}

.open-button:active {
  transform: translateY(1px) scale(0.98);
}

.open-button:focus-visible {
  outline: 3px solid rgba(112, 51, 66, 0.32);
  outline-offset: 4px;
}

.open-button__icon {
  font-family: sans-serif;
  font-size: 0.82rem;
}

.final-surprise {
  position: relative;
  z-index: 20;
  display: flex;
  margin-top: 1.1rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  color: var(--wine);
  opacity: 0;
  transform: translateY(0.75rem);
  visibility: hidden;
}

.final-surprise p {
  margin: 0;
  font-size: clamp(0.82rem, 3vw, 0.98rem);
  font-style: italic;
}

.beating-heart {
  color: var(--rose-600);
  font-family: sans-serif;
  font-size: 0.95rem;
}

.floating-hearts {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.floating-heart {
  position: absolute;
  bottom: -3rem;
  left: var(--x);
  color: var(--color);
  font-family: sans-serif;
  font-size: var(--size);
  opacity: 0;
  filter: blur(var(--blur));
  animation: float-heart var(--duration) linear var(--delay) infinite;
}

.envelope-wrap.is-open .envelope__flap {
  animation: open-flap 1s cubic-bezier(0.32, 0, 0.28, 1) forwards;
}

.envelope-wrap.is-open .wax-seal {
  animation: release-seal 0.55s ease forwards;
}

.envelope-wrap.letter-released .letter-slot {
  z-index: 4;
  overflow: visible;
}

.envelope-wrap.letter-released .letter {
  animation: reveal-letter 1.25s cubic-bezier(0.2, 0.68, 0.25, 1) forwards;
}

.scene.has-opened .final-surprise {
  animation: show-final 0.7s 1.75s ease forwards;
}

.scene.has-opened .beating-heart {
  animation: heartbeat 1.3s 2.2s ease-in-out infinite;
}

@keyframes open-flap {
  0% {
    z-index: 5;
    transform: rotateX(0deg);
  }
  49% {
    z-index: 5;
  }
  50%, 100% {
    z-index: 1;
    transform: rotateX(180deg);
  }
}

@keyframes release-seal {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(-7deg) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -35%) rotate(8deg) scale(0.65);
    visibility: hidden;
  }
}

@keyframes reveal-letter {
  0% {
    opacity: 0;
    transform: translateX(-50%) scale(0.94);
  }
  14% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    transform: translate(-50%, var(--letter-open-y)) scale(1);
  }
}

@keyframes show-final {
  to {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }
}

@keyframes heartbeat {
  0%, 45%, 100% {
    transform: scale(1);
  }
  12% {
    transform: scale(1.32);
  }
  24% {
    transform: scale(1.08);
  }
  34% {
    transform: scale(1.24);
  }
}

@keyframes float-heart {
  0% {
    opacity: 0;
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  12% {
    opacity: var(--opacity);
  }
  75% {
    opacity: calc(var(--opacity) * 0.7);
  }
  100% {
    opacity: 0;
    transform: translate3d(var(--drift), -115vh, 0) rotate(28deg);
  }
}

.noscript-message {
  position: fixed;
  inset: 50% auto auto 50%;
  z-index: 100;
  width: min(28rem, 86vw);
  padding: 2rem;
  border-radius: 0.5rem;
  text-align: center;
  background: var(--cream);
  box-shadow: 0 1rem 3rem var(--paper-shadow);
  transform: translate(-50%, -50%);
}

.noscript-message small {
  display: inline-block;
  margin-top: 1rem;
}

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

@media (max-width: 520px) {
  :root {
    --envelope-width: min(22.5rem, 88vw);
    --letter-open-y: -36%;
  }

  .experience {
    padding-right: 0.5rem;
    padding-left: 0.5rem;
  }

  .scene {
    min-height: 30rem;
  }

  .envelope-wrap {
    height: calc(var(--envelope-height) + 10rem);
    margin-top: 1rem;
  }

  .letter {
    width: 87%;
    min-height: calc(var(--envelope-height) * 1.26);
  }

  .letter__content {
    padding: 1.55rem 1rem 1.4rem;
  }

  .open-button {
    min-width: min(13.5rem, 80vw);
    margin-top: 0.9rem;
  }

  .final-surprise {
    max-width: 90vw;
    text-align: center;
  }
}

@media (max-height: 720px) and (min-width: 521px) {
  .experience {
    padding-top: 1.1rem;
  }


  .scene {
    min-height: 33rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .floating-heart {
    display: none;
  }

  .envelope-wrap.is-open .envelope__flap {
    z-index: 1;
    transform: rotateX(180deg);
  }

  .envelope-wrap.letter-released .letter {
    opacity: 1;
    transform: translate(-50%, var(--letter-open-y)) scale(1);
  }
}