:root {
  color-scheme: light;
  --paper: #f7efe5;
  --paper-deep: #ecdfd0;
  --ink: #332725;
  --muted: #9f8980;
  --rose: #c76b68;
  --rose-dark: #a84f50;
  --envelope: #d9847f;
  --envelope-dark: #bd625f;
  --envelope-light: #e99d95;
  --white: #fffaf5;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  min-height: 100svh;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button {
  font: inherit;
}

.page-shell {
  position: relative;
  display: grid;
  min-height: 100svh;
  place-items: center;
  overflow: hidden;
  isolation: isolate;
  padding: max(28px, env(safe-area-inset-top)) max(22px, env(safe-area-inset-right)) max(26px, env(safe-area-inset-bottom)) max(22px, env(safe-area-inset-left));
  background:
    radial-gradient(circle at 50% 32%, rgba(255, 255, 255, 0.62), transparent 36%),
    linear-gradient(145deg, #f8f0e7 0%, #f4e8da 100%);
}

.page-shell::before,
.page-shell::after {
  position: absolute;
  z-index: -1;
  color: rgba(199, 107, 104, 0.12);
  content: "♥";
  font-family: Georgia, serif;
  font-size: clamp(130px, 28vw, 300px);
  line-height: 1;
  transform: rotate(-16deg);
}

.page-shell::before {
  top: -0.2em;
  left: -0.18em;
}

.page-shell::after {
  right: -0.12em;
  bottom: -0.18em;
  transform: rotate(18deg);
}

.ambient {
  position: absolute;
  z-index: -1;
  border: 1px solid rgba(199, 107, 104, 0.14);
  border-radius: 50%;
  pointer-events: none;
}

.ambient-one {
  width: min(72vw, 680px);
  aspect-ratio: 1;
  transform: translate(-38%, -42%);
}

.ambient-two {
  width: min(45vw, 420px);
  aspect-ratio: 1;
  transform: translate(72%, 48%);
}

.letter-card {
  width: min(100%, 480px);
  padding: 18px 22px 22px;
  text-align: center;
}

.topline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  margin-bottom: clamp(30px, 6vh, 60px);
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.topline-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--rose);
}

.intro {
  transition: opacity 500ms ease, transform 500ms ease;
}

.intro.is-hidden {
  opacity: 0;
  transform: translateY(-12px);
  pointer-events: none;
}

.eyebrow,
.message-kicker {
  margin: 0 0 12px;
  color: var(--rose);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.23em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--ink);
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: clamp(55px, 14vw, 82px);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.78;
}

h1 em {
  color: var(--rose);
  font-weight: 600;
}

.hint {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.01em;
}

.envelope-button {
  position: relative;
  display: block;
  width: min(78vw, 320px);
  aspect-ratio: 1.45;
  margin: clamp(42px, 7vh, 76px) auto 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.envelope-button:focus-visible {
  outline: 3px solid rgba(199, 107, 104, 0.4);
  outline-offset: 13px;
  border-radius: 10px;
}

.envelope-shadow {
  position: absolute;
  right: 4%;
  bottom: 1%;
  left: 4%;
  height: 15%;
  border-radius: 50%;
  background: rgba(100, 57, 52, 0.2);
  filter: blur(13px);
  transition: transform 650ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 500ms ease;
}

.envelope {
  position: absolute;
  inset: 0;
  display: block;
  border-radius: 7px;
  box-shadow: 0 18px 30px rgba(151, 79, 73, 0.2), 0 3px 5px rgba(116, 54, 52, 0.1);
  transform: translateY(0) rotate(0deg);
  transition: transform 650ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 650ms ease;
}

.envelope-back,
.envelope-front,
.envelope-flap,
.envelope-letter {
  position: absolute;
  display: block;
}

.envelope-back {
  inset: 0;
  z-index: 1;
  border-radius: inherit;
  background: var(--envelope);
}

.envelope-back::before,
.envelope-back::after {
  position: absolute;
  bottom: 0;
  width: 52%;
  height: 100%;
  background: var(--envelope-dark);
  content: "";
}

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

.envelope-back::after {
  right: 0;
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  background: #cb706c;
}

.envelope-letter {
  z-index: 2;
  top: 3%;
  left: 11%;
  width: 78%;
  height: 90%;
  padding: 22px;
  border-radius: 2px;
  background: var(--white);
  box-shadow: 0 2px 10px rgba(109, 61, 51, 0.12);
  opacity: 0.98;
  transform: translateY(0);
  transition: transform 650ms 100ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.letter-line {
  display: block;
  width: 56%;
  height: 2px;
  margin: 8px auto;
  background: #e7c9bd;
}

.letter-line-short {
  width: 36%;
}

.letter-heart {
  display: block;
  margin-top: 7px;
  color: var(--rose);
  font-family: Georgia, serif;
  font-size: 25px;
}

.envelope-front {
  inset: 0;
  z-index: 3;
  overflow: hidden;
  border-radius: inherit;
  background: linear-gradient(135deg, transparent 49.7%, var(--envelope-light) 50%) left bottom / 100% 100% no-repeat;
  clip-path: polygon(0 0, 50% 56%, 100% 0, 100% 100%, 0 100%);
}

.envelope-front::after {
  position: absolute;
  right: -1%;
  bottom: -1%;
  left: -1%;
  height: 60%;
  background: var(--envelope);
  content: "";
  clip-path: polygon(0 100%, 50% 0, 100% 100%);
}

.envelope-flap {
  top: 0;
  left: 0;
  z-index: 4;
  width: 100%;
  height: 66%;
  border-radius: 7px 7px 0 0;
  background: var(--envelope-light);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top center;
  transition: transform 650ms cubic-bezier(0.2, 0.8, 0.2, 1), z-index 0ms 325ms;
}

.envelope-label {
  position: absolute;
  z-index: 5;
  right: 0;
  bottom: 19%;
  left: 0;
  color: rgba(255, 250, 245, 0.97);
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: clamp(23px, 6vw, 29px);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-shadow: 0 1px 1px rgba(129, 59, 59, 0.14);
  transition: opacity 300ms ease;
}

.tap-ripple {
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  width: 22px;
  height: 22px;
  border: 1px solid rgba(199, 107, 104, 0.45);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.5);
}

.envelope-button:not(.is-open):active .envelope {
  transform: translateY(4px) scale(0.985);
}

.envelope-button.is-open .envelope {
  box-shadow: 0 20px 30px rgba(151, 79, 73, 0.14), 0 3px 5px rgba(116, 54, 52, 0.06);
  transform: translateY(22px) rotate(0deg);
}

.envelope-button.is-open .envelope-shadow {
  opacity: 0.55;
  transform: scaleX(0.85);
}

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

.envelope-button.is-open .envelope-letter {
  transform: translateY(-46%);
}

.envelope-button.is-open .envelope-label {
  opacity: 0;
}

.envelope-button.is-open .tap-ripple {
  animation: ripple 850ms ease-out;
}

.message {
  min-height: 128px;
  margin-top: 52px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms 220ms ease, transform 600ms 220ms ease;
}

.message.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.message-kicker {
  margin-bottom: 10px;
  font-size: 10px;
}

.message-text {
  margin: 0;
  color: var(--ink);
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: clamp(31px, 8vw, 43px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 0.98;
}

.message-heart {
  display: block;
  margin-top: 13px;
  color: var(--rose);
  font-family: Georgia, serif;
  font-size: 17px;
}

.footer-note {
  margin: clamp(38px, 7vh, 72px) 0 0;
  color: var(--muted);
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 18px;
  font-style: italic;
}

@keyframes ripple {
  0% { opacity: 0.7; transform: translate(-50%, -50%) scale(0.5); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(13); }
}

@media (max-height: 720px) {
  .letter-card { padding-top: 8px; }
  .topline { margin-bottom: 23px; }
  .envelope-button { margin-top: 29px; }
  .message { margin-top: 38px; }
  .footer-note { margin-top: 28px; }
}

@media (min-width: 700px) {
  .letter-card { padding: 30px 26px; }
  .topline { margin-bottom: 46px; }
  .envelope-button { margin-top: 55px; }
}

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