@font-face {
  font-family: "BirthdayHand";
  src: url("../assets/fonts/birthday-hand-subset.woff2") format("woff2");
  font-display: swap;
}

:root {
  color-scheme: light;
  --paper: #fff8ed;
  --ink: #36241f;
  --muted: #7a625b;
  --red: #d95050;
  --rose: #ff8fa3;
  --gold: #f0b35a;
  --green: #90c8a2;
  --blue: #92b8e8;
  --hand-font: "BirthdayHand", "STXingkai", "FZShuTi", "KaiTi", "Kaiti SC", "Xingkai SC", "HanziPen SC", "Comic Sans MS", cursive;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  overflow: hidden;
  font-family: var(--hand-font);
  color: var(--ink);
  background: #ffe9ea;
}

button,
input {
  font: inherit;
}

.app {
  width: 100vw;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  position: relative;
}

.screen {
  position: absolute;
  inset: 0;
  display: none;
  min-height: 100vh;
  min-height: 100svh;
  padding: 24px;
}

.screen.is-active {
  display: grid;
}

.cover-screen {
  place-items: center;
  background:
    radial-gradient(circle at 24% 18%, rgba(255, 255, 255, 0.9), transparent 24%),
    linear-gradient(160deg, #ffe4ec 0%, #fff2cc 52%, #d9f0de 100%);
}

.corner-dog {
  position: fixed;
  z-index: 1;
  width: clamp(78px, 25vw, 118px);
  pointer-events: none;
}

.top-left {
  top: 8px;
  left: 6px;
}

.top-right {
  top: 8px;
  right: 6px;
}

.bottom-left {
  bottom: 8px;
  left: 6px;
}

.bottom-right {
  right: 6px;
  bottom: 8px;
}

.envelope {
  position: relative;
  z-index: 2;
  width: min(330px, 84vw);
  height: 224px;
  filter: drop-shadow(0 22px 38px rgba(137, 68, 76, 0.22));
}

.envelope-flap {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 118px;
  clip-path: polygon(0 0, 50% 72%, 100% 0, 100% 100%, 0 100%);
  background: #ffd4dc;
  border: 2px solid rgba(156, 76, 82, 0.2);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
}

.envelope-body {
  position: absolute;
  left: 0;
  right: 0;
  top: 88px;
  bottom: 0;
  padding: 42px 26px 22px;
  border: 2px solid rgba(156, 76, 82, 0.2);
  border-radius: 0 0 8px 8px;
  background:
    linear-gradient(35deg, transparent 48%, rgba(255, 255, 255, 0.42) 49% 51%, transparent 52%),
    #fff5df;
  text-align: center;
}

.stamp-text {
  margin: 0 0 8px;
  color: #ac5656;
  font-size: 15px;
  font-weight: 700;
}

.envelope h1 {
  margin: 0 0 10px;
  font-size: 40px;
  font-weight: 700;
  letter-spacing: 0;
}

.envelope p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.seal-button {
  position: absolute;
  left: 50%;
  top: 88px;
  z-index: 3;
  width: 54px;
  height: 54px;
  border: 0;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: #c9333e;
  box-shadow: inset 0 -6px 0 rgba(86, 0, 11, 0.16), 0 8px 16px rgba(142, 36, 47, 0.25);
  cursor: pointer;
}

.seal-button span,
.seal-button span::before,
.seal-button span::after {
  position: absolute;
  display: block;
  background: #ffe0d8;
}

.seal-button span {
  left: 18px;
  top: 15px;
  width: 19px;
  height: 18px;
  transform: rotate(-45deg);
}

.seal-button span::before,
.seal-button span::after {
  content: "";
  width: 19px;
  height: 19px;
  border-radius: 50%;
}

.seal-button span::before {
  top: -10px;
}

.seal-button span::after {
  left: 10px;
}

.question-box {
  position: fixed;
  left: 50%;
  bottom: max(28px, env(safe-area-inset-bottom));
  z-index: 4;
  width: min(340px, calc(100vw - 36px));
  padding: 18px;
  border: 1px solid rgba(171, 83, 94, 0.2);
  border-radius: 8px;
  background: rgba(255, 249, 240, 0.94);
  box-shadow: 0 18px 40px rgba(107, 49, 55, 0.18);
  transform: translateX(-50%);
}

.question-box label {
  display: block;
  margin-bottom: 12px;
  font-size: 20px;
  font-weight: 700;
}

.answer-row {
  display: grid;
  grid-template-columns: 1fr 72px;
  gap: 8px;
}

.answer-row input {
  min-width: 0;
  height: 42px;
  border: 1px solid rgba(122, 98, 91, 0.24);
  border-radius: 8px;
  padding: 0 12px;
  background: #fff;
  font-size: 18px;
}

.answer-row button {
  min-height: 42px;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--red);
  font-size: 18px;
  font-weight: 700;
}

.hint {
  min-height: 20px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.letter-screen {
  position: relative;
  align-items: center;
  justify-items: center;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.42) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(#ffebef, #e6f5e8);
}

.letter-paper {
  position: relative;
  z-index: 4;
  width: min(380px, calc(100vw - 28px));
  min-height: min(680px, calc(100svh - 36px));
  padding: 30px 26px 70px;
  border-radius: 8px;
  background:
    linear-gradient(transparent 31px, rgba(230, 154, 154, 0.22) 32px),
    var(--paper);
  background-size: 100% 32px;
  box-shadow: 0 24px 58px rgba(109, 56, 62, 0.18);
}

.letter-date {
  margin: 0 0 12px;
  color: #a76060;
  font-size: 16px;
  font-weight: 700;
}

.letter-paper h2 {
  margin: 0 0 18px;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0;
}

.letter-content p {
  margin: 0 0 14px;
  font-size: 20px;
  line-height: 1.65;
}

.signature {
  position: absolute;
  right: 24px;
  bottom: 24px;
  margin: 0;
  color: #a64b4b;
  font-size: 21px;
  font-weight: 700;
}

.gallery-stage {
  position: absolute;
  inset: 0;
  z-index: 6;
  width: 100vw;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  pointer-events: none;
}

.speaker-button {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  right: 16px;
  z-index: 10;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 12px 28px rgba(96, 51, 60, 0.16);
  backdrop-filter: blur(12px);
  cursor: pointer;
  pointer-events: auto;
}

.speaker-button.is-muted::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 23px;
  z-index: 2;
  width: 26px;
  height: 3px;
  border-radius: 99px;
  background: var(--red);
  transform: rotate(-35deg);
}

.speaker-button.needs-tap {
  outline: 3px solid rgba(217, 80, 80, 0.28);
  outline-offset: 3px;
}

.speaker-button img,
.back-envelope-button img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  pointer-events: none;
}

.back-envelope-button {
  position: fixed;
  left: 50%;
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 10;
  display: grid;
  place-items: center;
  width: 62px;
  height: 48px;
  border: 0;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 12px 28px rgba(96, 51, 60, 0.16);
  transform: translateX(-50%);
  backdrop-filter: blur(12px);
  cursor: pointer;
  pointer-events: auto;
}

.back-envelope-button img {
  width: 34px;
  height: 34px;
}

.floating-photo,
.floating-dog,
.floating-heart {
  position: absolute;
  z-index: 2;
  pointer-events: none;
  animation: floatIn 9s ease-in-out forwards;
}

.floating-photo {
  width: clamp(70px, 23vw, 103px);
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 4px solid #fff;
  border-bottom-width: 12px;
  border-radius: 5px;
  box-shadow: 0 12px 24px rgba(87, 50, 55, 0.2);
}

.floating-dog {
  width: clamp(70px, 24vw, 108px);
}

.floating-heart {
  width: 34px;
  height: 34px;
  background: var(--rose);
  transform: rotate(-45deg);
  box-shadow: 0 10px 24px rgba(184, 59, 88, 0.16);
}

.floating-heart::before,
.floating-heart::after {
  content: "";
  position: absolute;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: inherit;
}

.floating-heart::before {
  top: -17px;
}

.floating-heart::after {
  left: 17px;
}

@keyframes floatIn {
  0% {
    opacity: 0;
    transform: translateY(22px) scale(0.88) rotate(var(--angle));
  }

  12%,
  78% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: translateY(-18px) scale(1.02) rotate(var(--angle));
  }
}

@media (max-height: 700px) {
  .letter-paper {
    padding-top: 22px;
    padding-bottom: 74px;
  }

  .letter-content p {
    margin-bottom: 10px;
    font-size: 18px;
    line-height: 1.55;
  }
}