:root {
  color-scheme: light;
  --background: #fff8fa;
  --surface: #fceef3;
  --accent: #eabbd0;
  --text: #55434d;
  --muted: #a88d98;
  --border: rgba(168, 141, 152, 0.3);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
}

button,
input {
  font: inherit;
}

.welcome {
  display: grid;
  min-height: 100svh;
  place-items: center;
  padding: 32px 20px;
  background:
    radial-gradient(ellipse at 50% 42%, rgba(252, 238, 243, 0.8), transparent 58%),
    var(--background);
}

.welcome__card {
  width: min(100%, 430px);
  padding: clamp(36px, 8vw, 64px) clamp(24px, 7vw, 52px);
  border: 1px solid rgba(234, 187, 208, 0.34);
  border-radius: 28px;
  background: rgba(255, 248, 250, 0.78);
  text-align: center;
  box-shadow: 0 24px 70px rgba(137, 95, 116, 0.07);
}

.welcome__title {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: clamp(1.2rem, 3vw, 1.45rem);
  font-weight: 400;
  letter-spacing: 0.035em;
}

.welcome__prompt {
  margin: 0 0 30px;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 400;
  letter-spacing: -0.035em;
}

.name-form {
  display: grid;
  gap: 14px;
}

.name-form__input {
  width: 100%;
  min-height: 54px;
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  outline: none;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  font-size: 1rem;
  text-align: center;
  transition:
    border-color 500ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 500ms cubic-bezier(0.22, 1, 0.36, 1);
}

.name-form__input::placeholder {
  color: #b7a3ac;
}

.name-form__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(234, 187, 208, 0.18);
}

.name-form__input[aria-invalid="true"] {
  border-color: #d7aabd;
}

.name-form__button {
  min-height: 54px;
  margin-top: 2px;
  border: 0;
  border-radius: 16px;
  background: var(--accent);
  color: #55434d;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  transition:
    background-color 450ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 450ms cubic-bezier(0.22, 1, 0.36, 1);
}

.name-form__button:hover {
  background: #e4aec6;
}

.name-form__button:active {
  transform: scale(0.985);
}

.name-form__button:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 4px;
}

.name-form__error {
  min-height: 1.35em;
  margin: -4px 0 -3px;
  color: #9e6d80;
  font-size: 0.9rem;
  opacity: 0;
  transform: translateY(-4px);
  transition:
    opacity 650ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 650ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

.welcome__card.is-leaving {
  opacity: 0;
  transform: translateY(-10px);
  transition:
    opacity 900ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 900ms cubic-bezier(0.22, 1, 0.36, 1);
}

.letter {
  min-height: 100svh;
  padding: clamp(64px, 12vh, 120px) 24px clamp(80px, 15vh, 150px);
  background: var(--surface);
}

.letter__content {
  width: min(100%, 740px);
  margin: 0 auto;
  color: var(--text);
  font-size: clamp(1.12rem, 2.2vw, 1.4rem);
  font-weight: 400;
  line-height: 1.95;
  letter-spacing: 0.006em;
  animation: letter-appear 1200ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.letter__paragraph {
  margin: 0;
  white-space: pre-line;
}

.letter__paragraph + .letter__paragraph {
  margin-top: 1.8em;
}

.letter__paragraph:first-child {
  margin-bottom: 1.8em;
}

.letter__word {
  opacity: 0;
  animation: word-appear 760ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.postcard {
  width: min(100%, 560px);
  margin: clamp(72px, 12vw, 104px) auto 0;
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 1100ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 1100ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

.postcard__envelope {
  position: relative;
}

.postcard__envelope::after {
  display: block;
  height: 0;
  content: "";
  transition: height 1500ms cubic-bezier(0.22, 1, 0.36, 1) 1950ms;
}

.postcard__shell {
  position: relative;
  height: clamp(220px, 48vw, 320px);
  perspective: 1000px;
  isolation: isolate;
}

.postcard__back {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(168, 141, 152, 0.2);
  border-radius: 18px;
  background: linear-gradient(145deg, #f8e2eb, #f1d6e1);
  box-shadow: 0 20px 46px rgba(137, 95, 116, 0.12);
}

.postcard__message {
  position: absolute;
  z-index: 3;
  right: 0;
  bottom: 0;
  left: 0;
  display: grid;
  width: 84%;
  height: clamp(220px, 56vw, 260px);
  margin: 0 auto;
  overflow: hidden;
  place-items: center;
  padding: 0 clamp(18px, 5vw, 34px);
  border: 0 solid rgba(234, 187, 208, 0.48);
  border-radius: 14px;
  background: var(--background);
  color: var(--text);
  font-size: clamp(1rem, 2.8vw, 1.25rem);
  line-height: 1.8;
  text-align: center;
  opacity: 0;
  transform: translateY(0);
  transition:
    opacity 900ms cubic-bezier(0.22, 1, 0.36, 1) 2450ms,
    transform 1700ms cubic-bezier(0.22, 1, 0.36, 1) 1950ms;
}

.postcard__message-text {
  opacity: 0;
  transition: opacity 900ms cubic-bezier(0.22, 1, 0.36, 1) 3650ms;
}

.postcard__front {
  position: absolute;
  z-index: 2;
  inset: 0;
  border-radius: 18px;
  background: linear-gradient(150deg, #f5dce6, #efd1de);
  clip-path: polygon(0 0, 50% 57%, 100% 0, 100% 100%, 0 100%);
}

.postcard__front::before,
.postcard__front::after {
  position: absolute;
  inset: 0;
  content: "";
}

.postcard__front::before {
  background: linear-gradient(35deg, rgba(255, 248, 250, 0.28), transparent 56%);
  clip-path: polygon(0 0, 50% 57%, 0 100%);
}

.postcard__front::after {
  background: linear-gradient(-35deg, rgba(255, 248, 250, 0.2), transparent 56%);
  clip-path: polygon(100% 0, 50% 57%, 100% 100%);
}

.postcard__flap {
  position: absolute;
  z-index: 4;
  inset: 0 0 auto;
  height: 58%;
  border-radius: 18px 18px 0 0;
  background: linear-gradient(160deg, #f9e7ee, #f1d6e1);
  clip-path: polygon(0 0, 50% 100%, 100% 0);
  transform: rotateX(0);
  transform-origin: top center;
  transition:
    transform 1550ms cubic-bezier(0.22, 1, 0.36, 1) 400ms,
    z-index 0ms linear 1950ms;
}

.postcard__seal {
  position: absolute;
  z-index: 5;
  top: 56%;
  left: 50%;
  display: grid;
  width: clamp(64px, 17vw, 82px);
  aspect-ratio: 1;
  place-items: center;
  padding: 8px;
  border: 1px solid rgba(255, 248, 250, 0.48);
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 26%, rgba(255, 255, 255, 0.34), transparent 35%),
    linear-gradient(145deg, #d8a2b7, #bd8299);
  box-shadow:
    0 6px 16px rgba(112, 55, 74, 0.2),
    inset 0 2px 5px rgba(255, 255, 255, 0.45),
    inset 0 -3px 6px rgba(112, 55, 74, 0.16);
  cursor: pointer;
  transform: translate(-50%, -50%);
  animation: seal-pulse 3200ms ease-in-out infinite;
  transition:
    opacity 1100ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 1100ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.postcard__seal:hover {
  box-shadow:
    0 8px 20px rgba(112, 55, 74, 0.24),
    inset 0 2px 5px rgba(255, 255, 255, 0.45),
    inset 0 -3px 6px rgba(112, 55, 74, 0.16);
}

.postcard__seal:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 5px;
}

.postcard__seal:hover {
  animation-play-state: paused;
}

.postcard__seal svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  filter: drop-shadow(0 2px 2px rgba(112, 28, 48, 0.2));
}

.postcard.is-open .postcard__seal {
  opacity: 0;
  pointer-events: none;
  animation: none;
  transform: translate(-50%, -50%) scale(0.72) rotate(-12deg);
}

.postcard.is-open .postcard__flap {
  z-index: 1;
  transform: rotateX(180deg);
}

.postcard.is-open .postcard__message {
  opacity: 1;
  transform: translateY(calc(100% - clamp(220px, 48vw, 320px) - 25px));
}

.postcard.is-open .postcard__message-text {
  opacity: 1;
}

.postcard.is-open .postcard__envelope::after {
  height: calc(clamp(220px, 56vw, 260px) + 22px);
}

.video-showcase {
  width: min(100%, 740px);
  margin: clamp(56px, 9vw, 80px) auto 0;
  padding: clamp(8px, 2vw, 14px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 24px;
  background: rgba(255, 248, 250, 0.48);
  box-shadow:
    0 18px 48px rgba(137, 95, 116, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.62);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 1200ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 1200ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

.video-showcase__video {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(78svh, 720px);
  border-radius: 17px;
  background: rgba(252, 238, 243, 0.75);
  object-fit: contain;
}

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

[hidden] {
  display: none !important;
}

@keyframes word-appear {
  from {
    opacity: 0;
    transform: translateY(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes letter-appear {
  from {
    opacity: 0;
    transform: translateY(9px);
  }

  @keyframes seal-pulse {
    0%,
    100% {
      transform: translate(-50%, -50%) scale(1);
    }

    50% {
      transform: translate(-50%, -50%) scale(1.045);
    }
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .letter {
    padding-right: 22px;
    padding-left: 22px;
  }

  .letter__content {
    font-size: 1.08rem;
    line-height: 1.85;
  }
}

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

  .letter__word {
    opacity: 1;
    animation: none;
  }

  .postcard,
  .postcard.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .video-showcase,
  .video-showcase.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .postcard__seal,
  .postcard__flap,
  .postcard__message {
    transition: none !important;
  }

  .postcard__seal {
    animation: none;
  }

  .postcard__seal {
    opacity: 1;
    transform: translate(-50%, -50%);
  }

  .postcard.is-open .postcard__seal {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.72);
  }

  .postcard__flap {
    transform: none;
  }

  .postcard.is-open .postcard__flap {
    z-index: 1;
    transform: rotateX(180deg);
  }

  .postcard__message {
    opacity: 0;
    transform: none;
    transition-delay: 0ms;
  }

  .postcard__message-text {
    opacity: 0;
    transition: none;
  }

  .postcard.is-open .postcard__message {
    opacity: 1;
    transform: translateY(calc(100% - clamp(220px, 48vw, 320px) - 25px));
  }

  .postcard.is-open .postcard__message-text {
    opacity: 1;
  }

  .letter__content {
    opacity: 1;
    animation: none;
  }

  .welcome__card.is-leaving {
    opacity: 1;
    transform: none;
  }
}