*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --paper: #fdf8f3;
  --paper-dark: #ebe3d9;
  --ink: #2c2622;
  --ink-soft: #5c534c;
  --accent: #c45c6a;
  --accent-deep: #9a3d4a;
  --envelope: #e8dfd4;
  --envelope-edge: #cfc4b8;
  --shadow: rgba(44, 38, 34, 0.18);
  --glow: rgba(196, 92, 106, 0.15);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: "Outfit", system-ui, sans-serif;
  font-weight: 300;
  color: var(--ink);
  background: linear-gradient(165deg, #1a1520 0%, #2d2435 35%, #3d2f3a 70%, #4a3540 100%);
  overflow-x: visible;
}

.page-root {
  overflow-x: hidden;
  overflow-x: clip;
  min-height: 100dvh;
}

.bg-glow {
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 55vh;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, var(--glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  animation: twinkle 4s ease-in-out infinite;
}

@keyframes twinkle {
  0%,
  100% {
    opacity: 0.3;
    transform: scale(1);
  }
  50% {
    opacity: 0.9;
    transform: scale(1.2);
  }
}

.intro {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2.5rem 1.25rem 1rem;
  max-width: 32rem;
  margin: 0 auto;
}

body.letter-open .intro {
  z-index: 100;
}

.intro-kicker {
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin: 0 0 0.75rem;
}

.intro h1 {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 400;
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  color: rgba(255, 250, 245, 0.95);
  margin: 0 0 0.75rem;
  line-height: 1.2;
}

.intro-hint {
  margin: 0;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.5);
}

.intro-motion {
  margin: 1rem 0 0;
}

.motion-toggle {
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.38);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.motion-toggle:hover {
  color: rgba(255, 255, 255, 0.55);
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.04);
}

.motion-toggle:focus-visible {
  outline: 2px solid rgba(196, 92, 106, 0.65);
  outline-offset: 3px;
}

@keyframes envelope-float {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-8px) rotate(-0.6deg);
  }
}

@keyframes envelope-shadow-breathe {
  0%,
  100% {
    opacity: 0.75;
    transform: translateX(-50%) scaleX(1);
  }
  50% {
    opacity: 1;
    transform: translateX(-50%) scaleX(1.12);
  }
}

@keyframes envelope-seal-glow {
  0%,
  100% {
    box-shadow: 0 4px 14px rgba(154, 61, 74, 0.45);
  }
  50% {
    box-shadow:
      0 4px 18px rgba(154, 61, 74, 0.55),
      0 0 24px rgba(196, 92, 106, 0.25);
  }
}

@media (prefers-reduced-motion: no-preference) {
  body:not(.envelope-anim-off) .envelope-hitbox:not(.is-open):not(:disabled) .envelope {
    animation: envelope-float 4.2s ease-in-out infinite;
  }

  body:not(.envelope-anim-off) .envelope-hitbox:not(.is-open):not(:disabled) .envelope__shadow {
    animation: envelope-shadow-breathe 4.2s ease-in-out infinite;
    animation-delay: 0.15s;
  }

  body:not(.envelope-anim-off) .envelope-hitbox:not(.is-open):not(:disabled) .envelope__seal {
    animation: envelope-seal-glow 2.8s ease-in-out infinite;
  }
}

.stage {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding: 1.5rem 1rem 3rem;
  min-height: 52vh;
}

.stage.is-letter-open {
  z-index: 80;
  pointer-events: none;
}

.stage.is-letter-open .envelope-hitbox {
  pointer-events: auto;
}

.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;
}

.envelope-hitbox {
  appearance: none;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  position: relative;
  transition: transform 0.35s ease;
}

.envelope-hitbox:hover:not(:disabled) .envelope {
  transform: translateY(-6px) scale(1.02);
  animation: none;
}

.envelope-hitbox:active:not(:disabled) .envelope {
  transform: translateY(-2px) scale(1.01);
  animation: none;
}

.envelope-hitbox:disabled {
  cursor: default;
}

.envelope {
  --w: min(92vw, 340px);
  --h: calc(var(--w) * 0.62);
  width: var(--w);
  height: var(--h);
  position: relative;
  perspective: 800px;
  transition: transform 0.45s cubic-bezier(0.34, 1.2, 0.64, 1);
}

.envelope__shadow {
  position: absolute;
  left: 50%;
  bottom: -12px;
  width: 85%;
  height: 18px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.35), transparent 70%);
  filter: blur(8px);
  z-index: 0;
}

.envelope__back {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, var(--envelope) 0%, var(--paper-dark) 100%);
  border-radius: 4px;
  box-shadow: 0 12px 40px var(--shadow);
  z-index: 1;
}

.envelope__face {
  position: absolute;
  left: 3%;
  right: 3%;
  top: 6%;
  bottom: 10%;
  background: linear-gradient(165deg, #ddd5cb 0%, var(--envelope) 45%, var(--paper-dark) 100%);
  border-radius: 2px;
  z-index: 2;
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.35);
  pointer-events: none;
}

.envelope__side {
  position: absolute;
  top: 8%;
  bottom: 12%;
  width: 50%;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(135deg, var(--envelope-edge) 0%, var(--envelope) 50%, var(--paper-dark) 100%);
}

.envelope__side--left {
  left: 0;
  clip-path: polygon(0 0, 100% 22%, 100% 78%, 0 100%);
  box-shadow: inset -2px 0 4px rgba(0, 0, 0, 0.06);
}

.envelope__side--right {
  right: 0;
  clip-path: polygon(100% 0, 0 22%, 0 78%, 100% 100%);
  box-shadow: inset 2px 0 4px rgba(0, 0, 0, 0.06);
}

.envelope__front {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 62%;
  background: linear-gradient(180deg, var(--envelope-edge) 0%, var(--envelope) 38%, var(--paper-dark) 100%);
  clip-path: polygon(0 100%, 50% 0, 100% 100%);
  z-index: 4;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.envelope__flap {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 62%;
  background: linear-gradient(180deg, #d4cbc2 0%, var(--envelope) 50%, var(--envelope-edge) 100%);
  clip-path: polygon(0 0, 50% 100%, 100% 0);
  transform-origin: 50% 0%;
  transition: transform 0.85s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 5;
  box-shadow: 0 3px 14px var(--shadow);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.envelope__seal {
  position: absolute;
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-deep) 100%);
  color: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(154, 61, 74, 0.45);
  z-index: 6;
  transition: opacity 0.4s ease, transform 0.5s ease;
}

.envelope #letterPanel {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.envelope__paper {
  position: absolute;
  left: 5%;
  right: 5%;
  bottom: 12%;
  top: 8%;
  background: var(--paper);
  border-radius: 2px;
  z-index: 2;
  box-shadow: 0 2px 12px var(--shadow);
  overflow: hidden;
  transition: opacity 0.35s ease;
}

.envelope__paper-inner {
  padding: 1.1rem 1rem 1rem;
  height: 100%;
  overflow-y: auto;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: clamp(0.95rem, 2.8vw, 1.05rem);
  line-height: 1.55;
  color: var(--ink);
  text-align: left;
}

.envelope__paper-inner p {
  margin: 0 0 0.65rem;
}

.letter-dear {
  font-weight: 600;
  font-size: 1.05em;
}

.letter-sign {
  margin-top: 0.85rem !important;
  font-style: italic;
  color: var(--ink-soft);
}

.editable {
  outline: none;
  border-bottom: 1px dashed rgba(196, 92, 106, 0.35);
  min-width: 2ch;
  display: inline-block;
}

.editable:focus {
  border-bottom-color: var(--accent);
}

.envelope-hitbox.is-open .envelope__seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.35);
  pointer-events: none;
  transition:
    opacity 0.45s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.55s cubic-bezier(0.34, 1.1, 0.64, 1);
}

.envelope-hitbox.is-open .envelope__flap {
  transform: rotateX(180deg);
  transition: transform 1.05s cubic-bezier(0.33, 0.85, 0.36, 1) 0.22s;
}

.envelope-hitbox.is-open .envelope {
  transform: none;
  transform-style: preserve-3d;
}

@keyframes letter-emerge {
  from {
    opacity: 0;
    transform: translate(-50%, 32px) scale(0.94);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
    filter: blur(0);
  }
}

body.letter-open #letterPanel {
  position: fixed;
  left: 50%;
  top: max(14rem, 30dvh);
  right: auto;
  bottom: auto;
  width: min(400px, calc(100vw - 1.5rem));
  max-width: calc(100vw - 1.5rem);
  margin-left: 0;
  min-height: 0;
  max-height: min(calc(100dvh - 15rem), 520px);
  transform: translate(-50%, 0);
  opacity: 1;
  visibility: visible;
  z-index: 200;
  border-radius: 4px;
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 0 100px rgba(255, 248, 240, 0.14);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: box-shadow 0.5s ease;
}

@media (prefers-reduced-motion: no-preference) {
  body.letter-open #letterPanel {
    animation: letter-emerge 0.78s cubic-bezier(0.34, 1.12, 0.64, 1) both;
  }
}

@media (prefers-reduced-motion: reduce) {
  .envelope-hitbox.is-open .envelope__flap {
    transition-duration: 0.01ms;
    transition-delay: 0s;
  }

  .envelope-hitbox.is-open .envelope__seal {
    transition-duration: 0.01ms;
  }

  body.letter-open #letterPanel {
    animation: none;
    filter: none;
  }
}

body.letter-open #letterPanel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3.25rem;
  pointer-events: none;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(
    to bottom,
    rgba(253, 248, 243, 0) 0%,
    rgba(253, 248, 243, 0.55) 50%,
    var(--paper) 100%
  );
  z-index: 1;
  opacity: 0.22;
  transition: opacity 0.35s ease;
}

body.letter-open #letterPanel.is-scrollable::after {
  opacity: 1;
}

body.letter-open #letterPanel .envelope__paper-inner {
  position: relative;
  z-index: 0;
  padding: 1.35rem 1.25rem 2rem;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-anchor: none;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.after {
  position: relative;
  z-index: 1;
  max-width: min(40rem, 100%);
  margin: 0 auto;
  padding: 0 1rem 3rem;
  color: rgba(255, 250, 245, 0.88);
}

.after-intro {
  padding: 1.1rem 1.15rem 1.2rem;
  margin-bottom: 1rem;
  text-align: center;
  background: rgba(255, 250, 245, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.after-intro h2 {
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 400;
  font-size: 1.45rem;
  margin: 0 0 0.65rem;
  color: rgba(255, 250, 245, 0.95);
  letter-spacing: 0.02em;
}

.after-intro p {
  margin: 0;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 1.02rem;
  line-height: 1.5;
  color: rgba(255, 250, 245, 0.72);
  font-weight: 400;
}

.chips {
  list-style: none;
  margin: 0;
  padding: 0;
  column-count: 1;
  column-gap: 0.75rem;
}

@media (min-width: 420px) {
  .chips {
    column-count: 2;
  }
}

.chips li {
  font-size: 0.88rem;
  line-height: 1.45;
  padding: 0.8rem 0.85rem;
  margin-bottom: 0.65rem;
  background: rgba(12, 10, 16, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  break-inside: avoid;
  page-break-inside: avoid;
}

@media (min-width: 420px) {
  .chips li {
    font-size: 0.85rem;
  }
}

.foot {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 1rem 1.25rem 2rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.35);
}