:root {
  color-scheme: dark;
  background: #17130f;
}

* {
  box-sizing: border-box;
}

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

body {
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 42%, #30271e 0, #1d1813 42%, #100d0a 100%);
  font-family: Georgia, "Times New Roman", serif;
}

.book {
  display: grid;
  place-items: center;
  align-items: center;
  width: 100vw;
  height: 100svh;
  padding: clamp(0.5rem, 2vw, 1.5rem);
  touch-action: pan-y;
  user-select: none;
}

.page {
  position: relative;
  height: min(96svh, calc(96vw * 1.5));
  aspect-ratio: 2 / 3;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  filter: drop-shadow(0 1.2rem 2.5rem rgb(0 0 0 / 55%));
}

.page:focus-visible {
  outline: 2px solid #b98b58;
  outline-offset: 0.35rem;
}

.page img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 180ms ease, transform 180ms ease;
}

.page img.turning {
  opacity: 0;
  transform: translateX(0.5rem) rotateY(-2deg);
}

#hint {
  position: absolute;
  right: 7%;
  bottom: 3.5%;
  color: rgb(68 48 29 / 72%);
  font-size: clamp(0.8rem, 1.5vw, 1rem);
  font-style: italic;
  letter-spacing: 0.03em;
  transition: opacity 500ms ease;
}

#hint.hidden {
  opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page img,
  #hint {
    transition: none;
  }
}