:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-rows: minmax(min-content, 1fr) auto minmax(min-content, 1fr);
  gap: clamp(1.5rem, 4vh, 2.5rem);
  place-items: center;
  padding: clamp(1rem, 4vw, 3rem);
  background-color: #141615;
  color: #dedbd2;
  font-family: "Songti TC", "Songti SC", "Noto Serif CJK TC", "PMingLiU",
    "Batang", "AppleMyungjo", serif;
}

main {
  grid-row: 2;
  width: min(100%, 36rem);
  min-width: 0;
  text-align: center;
  font-size: clamp(1.375rem, 6vw, 3rem);
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0.18em;
}

.quote-card {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
  cursor: pointer;
  perspective: 1000px;
  -webkit-tap-highlight-color: transparent;
}

.quote-card:focus-visible {
  outline: 2px solid #a9ad9f;
  outline-offset: 6px;
  border-radius: 1rem;
}

.card-inner {
  display: grid;
  transform-style: preserve-3d;
}

.is-flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  grid-area: 1 / 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: clamp(1.5rem, 5vw, 3rem) clamp(0.75rem, 3vw, 2rem);
  border: 0;
  border-radius: 1rem;
  background: transparent;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.verse {
  display: block;
  padding-left: 0.18em;
}

.verse + .verse {
  margin-top: 0.7em;
}

.card-back {
  transform: rotateY(180deg);
  gap: clamp(1rem, 3vw, 1.5rem);
  letter-spacing: 0;
}

.reading,
.meaning {
  display: block;
}

.reading {
  font-size: clamp(0.9375rem, 3.5vw, 1.125rem);
  letter-spacing: 0.12em;
}

.meaning {
  margin-top: 0.35rem;
  color: #b2b6ac;
  font-family: system-ui, sans-serif;
  font-size: clamp(0.75rem, 2.8vw, 0.9375rem);
  line-height: 1.7;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.source {
  display: block;
  margin-top: clamp(-1.75rem, -3vw, -0.75rem);
  color: #969a93;
  font-size: clamp(0.75rem, 2.5vw, 0.9375rem);
  font-style: normal;
  line-height: 1.6;
  letter-spacing: 0.12em;
  padding-left: 0.12em;
}

footer {
  grid-row: 3;
  align-self: end;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25em 0.4em;
  max-width: 100%;
  color: #969a93;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  text-align: center;
}

footer span {
  white-space: nowrap;
}

@media (prefers-reduced-motion: no-preference) {
  .card-inner {
    transition: transform 0.6s ease;
  }
  main {
    animation: fade-in 0.8s ease-out;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

::selection {
  background: #41473f;
  color: #f4f0e7;
}