:root {
  color-scheme: dark;
  --sky-top: #070b2d;
  --sky-middle: #171c4b;
  --sky-bottom: #123d3a;
  --moon: #fff3c4;
  --leaf: #3e8a68;
  --leaf-dark: #245a4f;
  --flower-rose: #ff9fb8;
  --flower-lavender: #b9acff;
  --flower-cream: #ffe6a7;
  --flower-center: #ffd166;
  --flower-sun: #ffc857;
  --flower-sky: #82d8ff;
  --cat-fur: #f1b77b;
  --cat-fur-light: #ffd6a5;
  --cat-shadow: #b96f5a;
  --cat-pink: #f28e9b;
  --cat-eye: #27304e;
  --envelope: #f2a3b8;
  --envelope-light: #f8b9c8;
  --paper: #fff9ee;
  --ink: #4a2c3b;
  --accent: #e96691;
  --focus: #ffe38a;
  --font-display: "Dancing Script", "Segoe Script", cursive;
  --font-body: "Be Vietnam Pro", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--sky-top);
}

body {
  min-width: 320px;
  margin: 0;
  overflow: hidden;
  font-family: var(--font-body);
  font-size: 16px;
}

button {
  min-width: 44px;
  min-height: 44px;
  border: 0;
  font: inherit;
  cursor: pointer;
  touch-action: manipulation;
}

button:focus-visible,
[tabindex="-1"]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

button:disabled {
  cursor: default;
  opacity: 0.72;
}

[hidden] {
  display: none !important;
}

.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;
}

.experience {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: clip;
  background:
    radial-gradient(circle at 78% 12%, rgba(185, 172, 255, 0.12), transparent 28%),
    linear-gradient(180deg, var(--sky-top) 0%, var(--sky-middle) 52%, var(--sky-bottom) 100%);
}

.sky,
.landscape,
.grass-layer,
.flower-layer,
.cat-layer,
#ambient-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.sky {
  z-index: 0;
  opacity: 0;
}

.experience.is-started .sky,
.experience.garden-complete .sky {
  animation: sky-appear 800ms ease-out forwards;
}

.moon {
  position: absolute;
  top: clamp(28px, 7vh, 72px);
  right: clamp(24px, 9vw, 140px);
  width: clamp(72px, 9vw, 118px);
  aspect-ratio: 1;
  border-radius: 50%;
  opacity: 0;
  background:
    radial-gradient(circle at 35% 30%, #fffceb 0 12%, transparent 13%),
    radial-gradient(circle at 66% 63%, rgba(222, 200, 149, 0.24) 0 8%, transparent 9%),
    radial-gradient(circle at 37% 70%, rgba(222, 200, 149, 0.18) 0 6%, transparent 7%),
    var(--moon);
  box-shadow:
    0 0 18px rgba(255, 243, 196, 0.48),
    0 0 52px rgba(255, 243, 196, 0.24),
    0 0 105px rgba(185, 172, 255, 0.16);
  transform: translateY(22px) scale(0.82);
}

.experience.is-started .moon,
.experience.garden-complete .moon {
  animation: moon-rise 1200ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

#ambient-canvas {
  z-index: 1;
  width: 100%;
  height: 100%;
}

.landscape {
  z-index: 2;
  overflow: hidden;
}

.landscape::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -5%;
  left: -10%;
  height: 30dvh;
  background: radial-gradient(ellipse at center, rgba(96, 206, 175, 0.16), transparent 70%);
  filter: blur(18px);
}

.hill {
  position: absolute;
  right: -2%;
  bottom: -1px;
  left: -2%;
}

.hill--back {
  height: 31dvh;
  background: linear-gradient(180deg, #143c43, #0d2b35);
  clip-path: polygon(0 55%, 18% 30%, 37% 60%, 57% 20%, 75% 52%, 100% 28%, 100% 100%, 0 100%);
}

.hill--front {
  height: 23dvh;
  background: linear-gradient(180deg, #153b35, #0a252c);
  clip-path: polygon(0 48%, 16% 18%, 35% 56%, 53% 24%, 70% 62%, 86% 32%, 100% 50%, 100% 100%, 0 100%);
}

.grass-layer,
.flower-layer {
  top: auto;
  z-index: 4;
  height: min(52dvh, 480px);
}

.grass-layer {
  z-index: 3;
}
.cat-layer {
  z-index: 5;
}

.grass-blade {
  position: absolute;
  bottom: -2px;
  left: var(--grass-x);
  width: var(--grass-width, 5px);
  height: var(--grass-height);
  border-radius: 80% 10% 60% 10%;
  opacity: 0;
  background: var(--grass-color);
  transform: translateX(-50%) rotate(var(--grass-tilt)) scaleY(0);
  transform-origin: bottom center;
}

.experience.is-started .grass-blade {
  animation: grass-grow 700ms cubic-bezier(0.22, 1, 0.36, 1) var(--grass-delay) forwards;
}

.flower {
  position: absolute;
  bottom: -1px;
  left: var(--x);
  width: 78px;
  height: calc(var(--stem-height) + 40px);
  transform: translateX(-50%) scale(var(--scale));
  transform-origin: bottom center;
}

.flower__sway {
  position: absolute;
  inset: 0;
  transform-origin: bottom center;
}

.experience.is-started[data-motion="full"] .flower__sway,
.experience.garden-complete[data-motion="full"] .flower__sway {
  animation: flower-sway var(--sway-duration) ease-in-out var(--sway-delay) infinite alternate;
}

.flower__stem {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 8px;
  height: var(--stem-height);
  border-radius: 999px;
  opacity: 0;
  background: linear-gradient(90deg, var(--leaf-dark), var(--leaf) 60%, #67b887);
  box-shadow: 0 0 9px rgba(62, 138, 104, 0.32);
  transform: translateX(-50%) scaleY(0);
  transform-origin: bottom center;
}

.experience.is-started .flower__stem {
  animation: stem-grow 1400ms cubic-bezier(0.22, 1, 0.36, 1) var(--stem-delay) forwards;
}

.flower__leaf {
  position: absolute;
  bottom: calc(var(--stem-height) * var(--leaf-level));
  left: 50%;
  width: 35px;
  height: 17px;
  border-radius: 100% 0 100% 0;
  opacity: 0;
  background: linear-gradient(135deg, var(--leaf), var(--leaf-dark));
  box-shadow: inset 0 0 5px rgba(255, 255, 255, 0.12);
  transform-origin: 0 50%;
}

.flower__leaf--left {
  --leaf-level: 0.42;
  transform: translateX(-2px) rotate(160deg) scale(0);
}

.flower__leaf--right {
  --leaf-level: 0.65;
  border-radius: 0 100% 0 100%;
  transform: translateX(2px) rotate(20deg) scale(0);
}

.experience.is-started .flower__leaf--left {
  animation: leaf-left 500ms cubic-bezier(0.22, 1, 0.36, 1) var(--leaf-delay) forwards;
}

.experience.is-started .flower__leaf--right {
  animation: leaf-right 500ms cubic-bezier(0.22, 1, 0.36, 1) calc(var(--leaf-delay) + 180ms) forwards;
}

.flower__bloom {
  position: absolute;
  bottom: calc(var(--stem-height) - 34px);
  left: 50%;
  width: 72px;
  height: 72px;
  transform: translateX(-50%);
}

.flower__petal {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 28px;
  height: 44px;
  border-radius: 55% 55% 45% 45%;
  opacity: 0;
  background:
    radial-gradient(circle at 50% 78%, rgba(255, 255, 255, 0.4), transparent 32%),
    var(--petal-color);
  box-shadow:
    inset 0 -5px 9px rgba(94, 44, 105, 0.14),
    0 0 13px var(--petal-glow);
  transform: translate(-50%, -100%) rotate(var(--petal-angle)) scale(0);
  transform-origin: 50% 100%;
}

.experience.is-started .flower__petal {
  animation: petal-bloom 900ms cubic-bezier(0.34, 1.56, 0.64, 1) calc(var(--bloom-delay) + var(--petal-stagger)) forwards;
}

.flower__core {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  width: 21px;
  aspect-ratio: 1;
  border-radius: 50%;
  opacity: 0;
  background:
    radial-gradient(circle at 35% 35%, #fff1a8 0 12%, transparent 14%),
    var(--core-color, var(--flower-center));
  box-shadow: 0 0 14px var(--core-glow, rgba(255, 209, 102, 0.62));
  transform: translate(-50%, -50%) scale(0);
}

.experience.is-started .flower__core {
  animation: core-pop 450ms cubic-bezier(0.34, 1.56, 0.64, 1) var(--core-delay) forwards;
}

.flower--rose {
  --petal-color: var(--flower-rose);
  --petal-glow: rgba(255, 159, 184, 0.28);
}

.flower--lavender {
  --petal-color: var(--flower-lavender);
  --petal-glow: rgba(185, 172, 255, 0.3);
}

.flower--cream {
  --petal-color: var(--flower-cream);
  --petal-glow: rgba(255, 230, 167, 0.28);
}
.flower--sun {
  --petal-color: var(--flower-sun);
  --petal-glow: rgba(255, 200, 87, 0.32);
}

.flower--sky {
  --petal-color: var(--flower-sky);
  --petal-glow: rgba(130, 216, 255, 0.3);
}

.flower--kind-rose .flower__petal {
  width: 31px;
  height: 42px;
  border-radius: 62% 48% 58% 44%;
}

.flower--kind-tulip .flower__bloom {
  width: 64px;
  height: 66px;
}

.flower--kind-tulip .flower__petal {
  width: 33px;
  height: 47px;
  border-radius: 52% 52% 36% 36%;
}

.flower--kind-sunflower .flower__bloom {
  width: 84px;
  height: 84px;
}

.flower--kind-sunflower .flower__petal {
  width: 21px;
  height: 50px;
  border-radius: 58% 58% 42% 42%;
}

.flower--kind-sunflower .flower__core {
  width: 25px;
  --core-color: #8a552e;
  --core-glow: rgba(255, 200, 87, 0.58);
}

.flower--kind-lily .flower__bloom {
  width: 78px;
  height: 78px;
}

.flower--kind-lily .flower__petal {
  width: 24px;
  height: 52px;
  border-radius: 54% 54% 46% 18%;
}

.flower--kind-lily .flower__core {
  width: 15px;
  --core-glow: rgba(255, 230, 167, 0.68);
}

.flower--kind-cosmos .flower__petal {
  width: 26px;
  height: 46px;
  border-radius: 62% 44% 62% 44%;
}

.flower--kind-cosmos .flower__core {
  width: 17px;
}

.flower--kind-lavender .flower__bloom {
  width: 56px;
  height: 78px;
  transform: translateX(-50%) scaleY(1.12);
}

.flower--kind-lavender .flower__petal {
  width: 15px;
  height: 31px;
  border-radius: 90% 90% 58% 58%;
}

.flower--kind-lavender .flower__core {
  width: 12px;
}

.flower--kind-daisy .flower__petal {
  width: 24px;
  height: 48px;
  border-radius: 52% 52% 48% 48%;
}

.experience.garden-complete .sky,
.experience.garden-complete .moon,
.experience.garden-complete .grass-blade,
.experience.garden-complete .flower__stem,
.experience.garden-complete .flower__leaf,
.experience.garden-complete .flower__petal,
.experience.garden-complete .flower__core {
  animation-name: none;
  animation-delay: 0ms;
}

.experience.garden-complete .sky,
.experience.garden-complete .moon,
.experience.garden-complete .grass-blade,
.experience.garden-complete .flower__stem,
.experience.garden-complete .flower__leaf,
.experience.garden-complete .flower__petal,
.experience.garden-complete .flower__core {
  opacity: 1;
}

.experience.garden-complete .moon {
  transform: none;
}

.experience.garden-complete .grass-blade {
  transform: translateX(-50%) rotate(var(--grass-tilt)) scaleY(1);
}

.experience.garden-complete .flower__stem {
  transform: translateX(-50%) scaleY(1);
}

.experience.garden-complete .flower__leaf--left {
  transform: translateX(-2px) rotate(160deg) scale(1);
}

.experience.garden-complete .flower__leaf--right {
  transform: translateX(2px) rotate(20deg) scale(1);
}

.experience.garden-complete .flower__petal {
  transform: translate(-50%, -100%) rotate(var(--petal-angle)) scale(1);
}

.experience.garden-complete .flower__core {
  transform: translate(-50%, -50%) scale(1);
}


.garden-cat {
  position: absolute;
  right: clamp(18px, 7vw, 112px);
  bottom: clamp(8px, 2dvh, 24px);
  width: clamp(130px, 18vw, 210px);
  height: clamp(120px, 18vw, 170px);
  opacity: 0;
  transform: translateY(22px) scale(0.82);
  transform-origin: bottom center;
}

.experience.is-started .garden-cat {
  animation: cat-arrive 1100ms cubic-bezier(0.22, 1, 0.36, 1) 5200ms forwards;
}

.experience.garden-complete .garden-cat {
  opacity: 1;
  transform: none;
  animation: none;
}

.experience.garden-complete[data-motion="full"] .cat__float {
  animation: cat-breathe 3200ms ease-in-out infinite alternate;
}

.cat__float,
.cat__body,
.cat__head,
.cat__face,
.cat__tail,
.cat__ear,
.cat__eye,
.cat__cheek,
.cat__nose,
.cat__mouth,
.cat__belly,
.cat__leg {
  position: absolute;
}

.cat__float {
  inset: 0;
  transform-origin: bottom center;
}

.cat__tail {
  bottom: 24%;
  left: 2%;
  width: 46%;
  height: 48%;
  border: 8px solid var(--cat-fur);
  border-right-color: transparent;
  border-bottom-color: transparent;
  border-radius: 72% 0 0 0;
  transform: rotate(-24deg);
  transform-origin: 100% 100%;
}

.experience.is-started .cat__tail,
.experience.garden-complete[data-motion="full"] .cat__tail {
  animation: cat-tail-wag 1700ms ease-in-out 6500ms infinite alternate;
}

.cat__body {
  right: 10%;
  bottom: 4%;
  left: 16%;
  height: 55%;
  border-radius: 48% 48% 40% 40%;
  background: linear-gradient(145deg, var(--cat-fur-light), var(--cat-fur));
  box-shadow: inset -10px -8px 0 rgba(185, 111, 90, 0.12), 0 12px 18px rgba(3, 5, 24, 0.2);
}

.cat__body::before {
  content: "";
  position: absolute;
  top: 12%;
  right: 18%;
  left: 18%;
  height: 14%;
  border-radius: 999px;
  background: var(--cat-pink);
  box-shadow: 0 3px 0 rgba(185, 111, 90, 0.2);
}

.cat__body::after {
  content: "";
  position: absolute;
  top: 15%;
  left: 50%;
  width: 10px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--flower-center);
  transform: translateX(-50%);
}

.cat__belly {
  right: 18%;
  bottom: 12%;
  left: 18%;
  height: 55%;
  border-radius: 50%;
  background: rgba(255, 226, 187, 0.42);
}

.cat__leg {
  bottom: -5%;
  width: 28%;
  height: 28%;
  border-radius: 45% 45% 50% 50%;
  background: var(--cat-fur);
  box-shadow: inset -4px -2px 0 rgba(185, 111, 90, 0.15);
}

.cat__leg--left {
  left: 18%;
}

.cat__leg--right {
  right: 18%;
}

.cat__head {
  top: 5%;
  left: 12%;
  width: 76%;
  height: 62%;
  border-radius: 48% 48% 46% 46%;
  background: linear-gradient(145deg, #ffdcae, var(--cat-fur));
  box-shadow: inset -7px -6px 0 rgba(185, 111, 90, 0.12), 0 9px 16px rgba(3, 5, 24, 0.16);
}

.cat__ear {
  top: -18%;
  width: 34%;
  height: 42%;
  border-radius: 65% 35% 12% 12%;
  background: var(--cat-fur);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.cat__ear::after {
  content: "";
  position: absolute;
  top: 23%;
  left: 27%;
  width: 46%;
  height: 56%;
  border-radius: 65% 35% 12% 12%;
  background: var(--cat-pink);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.cat__ear--left {
  left: 4%;
  transform: rotate(-18deg);
}

.cat__ear--right {
  right: 4%;
  transform: rotate(18deg);
}

.cat__face {
  inset: 22% 9% 9%;
}

.cat__eye {
  top: 30%;
  width: 11%;
  height: 17%;
  border-radius: 50%;
  background: var(--cat-eye);
  box-shadow: inset 2px 2px 0 #fff7d6;
  transform-origin: center;
}

.cat__eye--left {
  left: 25%;
}

.cat__eye--right {
  right: 25%;
}

.experience.is-started .cat__eye,
.experience.garden-complete[data-motion="full"] .cat__eye {
  animation: cat-blink 5200ms ease-in-out 7200ms infinite;
}

.cat__cheek {
  top: 53%;
  width: 17%;
  height: 10%;
  border-radius: 50%;
  background: rgba(242, 142, 155, 0.62);
}

.cat__cheek--left {
  left: 9%;
}

.cat__cheek--right {
  right: 9%;
}

.cat__nose {
  top: 52%;
  left: 50%;
  width: 9%;
  height: 8%;
  border-radius: 60% 40% 60% 40%;
  background: var(--cat-pink);
  transform: translateX(-50%) rotate(45deg);
}

.cat__mouth {
  top: 60%;
  left: 50%;
  width: 16%;
  height: 12%;
  border-bottom: 2px solid var(--cat-shadow);
  border-radius: 0 0 50% 50%;
  transform: translateX(-50%);
}

.cat__face::before,
.cat__face::after {
  content: "";
  position: absolute;
  top: 61%;
  width: 28%;
  height: 12%;
  border-top: 1px solid rgba(74, 44, 59, 0.45);
}

.cat__face::before {
  left: -13%;
  transform: rotate(10deg);
}

.cat__face::after {
  right: -13%;
  transform: rotate(-10deg);
}

@keyframes cat-arrive {
  0% {
    opacity: 0;
    transform: translateY(22px) scale(0.82);
  }
  72% {
    opacity: 1;
    transform: translateY(-4px) scale(1.03);
  }
  100% {
    opacity: 1;
    transform: none;
  }
}

@keyframes cat-breathe {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-3px) scale(1.01); }
}

@keyframes cat-tail-wag {
  from { transform: rotate(-24deg); }
  to { transform: rotate(-9deg); }
}

@keyframes cat-blink {
  0%, 45%, 48%, 100% { transform: scaleY(1); }
  46.5% { transform: scaleY(0.12); }
}

.envelope-trigger {
  position: absolute;
  z-index: 12;
  top: 43%;
  left: 50%;
  display: block;
  width: clamp(230px, 38vw, 360px);
  min-height: 44px;
  padding: 0;
  color: #fffdf7;
  opacity: 0;
  background: transparent;
  transform: translate(-50%, calc(-50% + 34px)) scale(0.92);
  pointer-events: none;
  transition: opacity 700ms ease-out, transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.envelope-trigger.is-visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.envelope-trigger:disabled {
  opacity: 1;
}

.envelope-float {
  display: block;
  width: 100%;
}

.experience[data-motion="full"] .envelope-trigger.is-visible:not(.is-opening) .envelope-float {
  animation: envelope-float 3600ms ease-in-out 700ms infinite alternate;
}

.envelope {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  perspective: 1000px;
  filter: drop-shadow(0 18px 24px rgba(3, 5, 24, 0.36));
}

.envelope__back,
.envelope__letter-preview,
.envelope__flap,
.envelope__front,
.envelope__seal {
  position: absolute;
}

.envelope__back {
  z-index: 1;
  inset: 0;
  border-radius: 12px;
  background: linear-gradient(150deg, var(--envelope-light), var(--envelope));
}

.envelope__letter-preview {
  z-index: 2;
  top: 12%;
  right: 8%;
  bottom: 8%;
  left: 8%;
  display: grid;
  align-content: center;
  gap: 10px;
  padding: 18px;
  border-radius: 8px 8px 3px 3px;
  background: var(--paper);
  box-shadow: 0 -5px 16px rgba(74, 44, 59, 0.12);
  transform: translateY(0);
  transition: transform 480ms cubic-bezier(0.22, 1, 0.36, 1);
}

.envelope__preview-line {
  display: block;
  width: 76%;
  height: 4px;
  border-radius: 99px;
  background: rgba(74, 44, 59, 0.2);
}

.envelope__preview-line--short {
  width: 48%;
}

.envelope__flap {
  z-index: 4;
  inset: 0 0 auto;
  height: 76%;
  background: linear-gradient(180deg, var(--envelope-light), #ee93ad);
  clip-path: polygon(0 0, 100% 0, 50% 72%);
  transform: rotateX(0deg);
  transform-origin: top center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  transition: transform 520ms cubic-bezier(0.4, 0, 0.2, 1), z-index 0s linear 260ms;
}

.envelope__front {
  z-index: 3;
  inset: 0;
  border-radius: 0 0 12px 12px;
  background: linear-gradient(145deg, #ef98b1, var(--envelope));
  clip-path: polygon(0 28%, 50% 68%, 100% 28%, 100% 100%, 0 100%);
}

.envelope__seal {
  z-index: 5;
  top: 49%;
  left: 50%;
  width: 26px;
  height: 26px;
  border-radius: 5px;
  background: var(--accent);
  box-shadow: 0 5px 12px rgba(107, 33, 66, 0.28);
  transform: translate(-50%, -50%) rotate(45deg);
  transition: opacity 180ms ease, transform 180ms ease;
}

.envelope__seal::before,
.envelope__seal::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
}

.envelope__seal::before {
  left: -13px;
}

.envelope__seal::after {
  top: -13px;
}

.envelope__prompt {
  display: block;
  margin-top: 22px;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.2vw, 2.25rem);
  font-weight: 600;
  line-height: 1.1;
  text-align: center;
  text-shadow: 0 2px 18px rgba(7, 11, 45, 0.85);
}

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

.envelope-trigger.is-opening .envelope__seal {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(45deg) scale(0.55);
}

.envelope-trigger.is-extracting .envelope__letter-preview {
  z-index: 6;
  transform: translateY(-65%);
}

#letter-dialog {
  position: fixed;
  z-index: 100;
  inset: 0;
  width: 100%;
  max-width: none;
  height: 100vh;
  height: 100dvh;
  max-height: none;
  padding: 0;
  border: 0;
  margin: 0;
  color: var(--ink);
  background: transparent;
  overflow: hidden;
}

#letter-dialog:not([open]) {
  display: none;
}

#letter-dialog[open] {
  display: grid;
  place-items: center;
}

#letter-dialog::backdrop {
  background: rgba(4, 6, 24, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.letter-card {
  position: relative;
  width: min(42rem, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  max-height: calc(100dvh - 2rem);
  padding: clamp(30px, 6vw, 64px);
  border: 1px solid rgba(126, 78, 88, 0.16);
  border-radius: clamp(18px, 3vw, 30px);
  overflow: auto;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 14% 18%, rgba(233, 102, 145, 0.05) 0 2px, transparent 3px),
    radial-gradient(circle at 78% 72%, rgba(74, 44, 59, 0.035) 0 1px, transparent 2px);
  background-size: 42px 42px, 31px 31px;
  box-shadow: 0 32px 80px rgba(2, 4, 22, 0.46);
  opacity: 0;
  transform: translateY(22px) scale(0.96);
  transition: opacity 320ms ease-out, transform 320ms cubic-bezier(0.22, 1, 0.36, 1);
  scrollbar-color: rgba(233, 102, 145, 0.45) transparent;
}

#letter-dialog.is-visible .letter-card {
  opacity: 1;
  transform: none;
}

#letter-dialog.is-closing .letter-card {
  opacity: 0;
  transform: translateY(10px) scale(0.98);
  transition-duration: 180ms;
  transition-timing-function: ease-in;
}

.letter-card__decoration {
  position: absolute;
  width: 48px;
  aspect-ratio: 1;
  border-radius: 60% 40% 65% 35%;
  opacity: 0.13;
  background: var(--accent);
  transform: rotate(35deg);
  pointer-events: none;
}

.letter-card__decoration--one {
  top: 18px;
  left: 24px;
}

.letter-card__decoration--two {
  right: 28px;
  bottom: 26px;
  width: 34px;
  background: #8e78ce;
  transform: rotate(-28deg);
}

.letter-card__recipient,
.letter-card__signature {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4vw, 2.35rem);
  font-weight: 600;
  line-height: 1.35;
}

#letter-title {
  margin: 18px auto 28px;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6vw, 3.7rem);
  font-weight: 700;
  line-height: 1.12;
  text-align: center;
}

#letter-title:focus {
  outline: none;
}

.letter-card__body {
  max-width: 70ch;
  margin-inline: auto;
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  line-height: 1.75;
}

.letter-card__body p {
  margin: 0 0 1.15em;
}

.letter-card__signature {
  margin-top: 26px;
  text-align: right;
}

#letter-close {
  display: block;
  min-height: 44px;
  margin: 34px auto 0;
  padding: 11px 24px;
  border-radius: 999px;
  color: #fff;
  background: var(--accent);
  box-shadow: 0 8px 20px rgba(151, 45, 85, 0.22);
  transition: background-color 180ms ease, transform 180ms ease;
}

#letter-close:hover {
  background: #d95884;
}

#letter-close:active {
  transform: scale(0.97);
}

.experience[data-motion="reduced"] .flower__sway,
.experience[data-motion="reduced"] .envelope-float {
  animation: none !important;
}

@keyframes sky-appear {
  to { opacity: 1; }
}

@keyframes moon-rise {
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes grass-grow {
  to {
    opacity: 1;
    transform: translateX(-50%) rotate(var(--grass-tilt)) scaleY(1);
  }
}

@keyframes stem-grow {
  to {
    opacity: 1;
    transform: translateX(-50%) scaleY(1);
  }
}

@keyframes leaf-left {
  to {
    opacity: 1;
    transform: translateX(-2px) rotate(160deg) scale(1);
  }
}

@keyframes leaf-right {
  to {
    opacity: 1;
    transform: translateX(2px) rotate(20deg) scale(1);
  }
}

@keyframes petal-bloom {
  to {
    opacity: 1;
    transform: translate(-50%, -100%) rotate(var(--petal-angle)) scale(1);
  }
}

@keyframes core-pop {
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@keyframes flower-sway {
  from { transform: rotate(calc(var(--sway-angle) * -1)); }
  to { transform: rotate(var(--sway-angle)); }
}

@keyframes envelope-float {
  from { transform: translateY(0); }
  to { transform: translateY(-9px); }
}

@media (max-width: 599px) {
  .moon {
    width: 70px;
    box-shadow:
      0 0 16px rgba(255, 243, 196, 0.4),
      0 0 42px rgba(255, 243, 196, 0.18);
  }

  .grass-layer,
  .flower-layer {
    height: 48dvh;
  }

  .envelope-trigger {
    width: clamp(220px, 72vw, 300px);
  }
  .garden-cat {
    right: 3vw;
    bottom: 0;
    width: clamp(106px, 33vw, 150px);
    height: clamp(100px, 32vw, 136px);
  }


  .letter-card {
    padding: 34px 24px 28px;
  }
}

@media (min-width: 900px) {
  .envelope-trigger {
    width: min(38vw, 360px);
  }
}

@media (max-height: 600px) and (orientation: landscape) {
  .moon {
    top: 20px;
    width: 58px;
  }

  .grass-layer,
  .flower-layer {
    height: 52dvh;
  }

  .envelope-trigger {
    top: 46%;
    width: min(240px, 36vw);
  }
  .garden-cat {
    right: 3vw;
    bottom: 0;
    width: min(150px, 29vw);
    height: min(136px, 29vw);
  }

  .envelope__prompt {
    margin-top: 12px;
    font-size: 1.35rem;
  }

  .letter-card {
    max-height: calc(100dvh - 1rem);
    padding: 24px 28px 20px;
  }

  #letter-title {
    margin-block: 8px 14px;
  }

  #letter-close {
    margin-top: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .experience .sky,
  .experience .moon,
  .experience .grass-blade,
  .experience .flower__stem,
  .experience .flower__leaf,
  .experience .flower__petal,
  .experience .flower__core,
  .experience .flower__sway,
  .experience .envelope-float,
  .experience .envelope__flap,
  .experience .envelope__letter-preview {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .experience .sky,
  .experience .moon,
  .experience .grass-blade,
  .experience .flower__stem,
  .experience .flower__leaf,
  .experience .flower__petal,
  .experience .flower__core {
    opacity: 1 !important;
  }

  .experience .moon {
    transform: none !important;
  }

  .experience .grass-blade {
    transform: translateX(-50%) rotate(var(--grass-tilt)) scaleY(1) !important;
  }

  .experience .flower__stem {
    transform: translateX(-50%) scaleY(1) !important;
  }

  .experience .flower__leaf--left {
    transform: translateX(-2px) rotate(160deg) scale(1) !important;
  }

  .experience .flower__leaf--right {
    transform: translateX(2px) rotate(20deg) scale(1) !important;
  }

  .experience .flower__petal {
    transform: translate(-50%, -100%) rotate(var(--petal-angle)) scale(1) !important;
  }

  .experience .flower__core {
    transform: translate(-50%, -50%) scale(1) !important;
  }

  #letter-dialog .letter-card {
    transform: none;
    transition: opacity 120ms ease-out;
  }

  #letter-dialog.is-closing .letter-card {
    transition-duration: 120ms;
  }
}

@media (prefers-reduced-motion: reduce) {
  .experience .garden-cat {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }

  .experience .cat__float,
  .experience .cat__tail,
  .experience .cat__eye {
    animation: none !important;
  }
}