* {
  box-sizing: border-box;
}

:root {
  color-scheme: light dark;
  /* BuildBoardView / LetterTileView (iOS + React handoff) */
  --lg-bg-primary: #f5f5f7;
  --lg-bg-page: #efefef;
  --lg-fg-primary: #1c1c1e;
  --lg-tile-border: rgba(0, 0, 0, 0.07);
  --lg-tile-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
  --lg-hover-ring: 0 0 0 1px rgba(0, 0, 0, 0.1);
  --lg-tile-hover-drop: 0 6px 14px rgba(0, 0, 0, 0.12);
  --lg-footer-fg: #444;
  --lg-footer-link: #111;
  /* BoardTileSizing: 56×88 answer tiles; overlap = 8% of width */
  --tile-w: 3.25rem;
  --tile-h: 5rem;
  --answer-overlap: 0.08;
  --tile-ease: cubic-bezier(0.34, 1.2, 0.64, 1);
  --tile-ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --tile-dur: 0.22s;
  --tile-enter-dur: 0.55s;
  --tile-exit-dur: 0.42s;
  --tile-stagger-ms: 42ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --lg-bg-primary: #3a3a3c;
    --lg-bg-page: #1c1c1e;
    --lg-fg-primary: #f5f5f7;
    --lg-tile-border: rgba(255, 255, 255, 0.12);
    --lg-tile-shadow: 0 3px 10px rgba(0, 0, 0, 0.45);
    --lg-hover-ring: 0 0 0 1px rgba(255, 255, 255, 0.18);
    --lg-tile-hover-drop: 0 8px 22px rgba(0, 0, 0, 0.55);
    --lg-footer-fg: #98989d;
    --lg-footer-link: #f5f5f7;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--lg-bg-page);
  color: var(--lg-fg-primary);
  font-family: ui-rounded, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Vertical room so scaled / translated tiles are not clipped (avoid overflow:* on .word — it traps content in a box) */
  padding-top: clamp(2.25rem, 6vh, 4rem);
  padding-inline: clamp(0.75rem, 4vw, 2rem);
  /* Keep tiles above the fixed footer (tall wrap + home indicator) */
  padding-bottom: calc(
    clamp(2.25rem, 6vh, 4rem) + 5.25rem + env(safe-area-inset-bottom, 0px)
  );
  overflow: visible;
}

.site-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  padding-top: 1rem;
  padding-bottom: calc(1.5rem + env(safe-area-inset-bottom, 0px));
  padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
  padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
  text-align: center;
  font-size: 0.875rem;
  color: var(--lg-footer-fg);
  background: var(--lg-bg-page);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--lg-footer-link);
  font-weight: 600;
}

.site-footer a:hover {
  text-decoration: underline;
}

.word {
  --word-fit-scale: 1;
  --fit-tile-w: calc(var(--tile-w) * var(--word-fit-scale));
  --fit-tile-h: calc(var(--tile-h) * var(--word-fit-scale));
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 100%;
  min-height: var(--fit-tile-h);
  overflow: visible;
  text-transform: uppercase;
}

.word__fit {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: max-content;
}

.word-layer {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: nowrap;
  width: max-content;
}

/* Incoming strip on top (new letters); outgoing underneath and exits */
.word--crossfade .word-layer--in {
  position: relative;
  z-index: 2;
  margin-inline: auto;
}

.word--crossfade .word-layer--out {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  pointer-events: none;
}

@keyframes tile-enter {
  0% {
    opacity: 0;
    transform: rotate(var(--tilt, 0deg)) translateY(0.6rem) scale(0.9);
  }
  70% {
    opacity: 1;
    transform: rotate(var(--tilt, 0deg)) translateY(-0.08rem) scale(1.02);
  }
  100% {
    opacity: 1;
    transform: rotate(var(--tilt, 0deg)) translateY(0) scale(1);
  }
}

@keyframes tile-exit {
  0% {
    opacity: 1;
    transform: rotate(var(--tilt, 0deg)) translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: rotate(var(--tilt, 0deg)) translateY(-0.45rem) scale(0.86);
  }
}

.word .tile {
  width: var(--fit-tile-w);
  height: var(--fit-tile-h);
}

.tile {
  position: relative;
  z-index: var(--z, 1);
  flex: 0 0 auto;
  width: var(--tile-w);
  height: var(--tile-h);
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  transform: rotate(var(--tilt, 0deg)) scale(1);
  transform-origin: center center;
  perspective: 200px;
  transition:
    transform var(--tile-dur) var(--tile-ease-out),
    box-shadow var(--tile-dur) ease,
    filter var(--tile-dur) ease;
  animation: tile-enter var(--tile-enter-dur) var(--tile-ease) backwards;
  animation-delay: calc(
    var(--stagger, 0) * var(--tile-stagger-ms) + var(--enter-overlap, 0s)
  );
  touch-action: manipulation;
}

.tile + .tile {
  margin-inline-start: calc(-1 * var(--tile-w) * var(--answer-overlap));
}

.word .tile + .tile {
  margin-inline-start: calc(-1 * var(--fit-tile-w) * var(--answer-overlap));
}

.tile__face {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  border-radius: min(1.25rem, calc(var(--tile-w) * 0.25));
  background: var(--lg-bg-primary);
  border: 1px solid var(--lg-tile-border);
  color: var(--lg-fg-primary);
  font-size: clamp(1.65rem, 5vw, 2.05rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  box-shadow: var(--lg-tile-shadow);
  transform: scale(1);
  transform-origin: center center;
  transition: transform var(--tile-dur) var(--tile-ease-out);
}

.word-layer--out .tile {
  animation: tile-exit var(--tile-exit-dur) var(--tile-ease-out) forwards;
  animation-delay: calc((var(--stagger-max, 0) - var(--stagger, 0)) * var(--tile-stagger-ms));
}

/* Pointer devices: mirror BuildBoardView outer scale(1.08) + inner scale(0.92) while dragging */
@media (hover: hover) and (pointer: fine) {
  .tile:hover {
    transform: rotate(var(--tilt, 0deg)) scale(1.08);
    z-index: 999;
    filter: drop-shadow(var(--lg-tile-hover-drop));
  }

  .tile:hover .tile__face {
    transform: scale(0.92);
    box-shadow:
      var(--lg-tile-shadow),
      var(--lg-hover-ring);
  }
}

.tile:active {
  transform: rotate(var(--tilt, 0deg)) scale(1.04);
  transition-duration: 0.1s;
}

.tile:active .tile__face {
  transform: scale(0.9);
  transition-duration: 0.1s;
}

@media (hover: hover) and (pointer: fine) {
  .tile:active:hover {
    transform: rotate(var(--tilt, 0deg)) scale(1.02);
  }
}

.word-gap {
  flex: 0 0 auto;
  width: 0.85rem;
}

.word .word-gap {
  width: calc(0.85rem * var(--word-fit-scale));
}

.word .tile__face {
  font-size: calc(clamp(1.65rem, 5vw, 2.05rem) * var(--word-fit-scale));
  border-radius: min(1.25rem, calc(var(--fit-tile-w) * 0.25));
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --tile-enter-dur: 0.01ms;
    --tile-exit-dur: 0.01ms;
    --tile-stagger-ms: 0ms;
    --tile-dur: 0.01ms;
  }

  .tile,
  .tile__face {
    animation: none !important;
    transition: none;
  }

  @media (hover: hover) and (pointer: fine) {
    .tile:hover {
      transform: rotate(var(--tilt, 0deg)) scale(1);
      filter: none;
    }

    .tile:hover .tile__face {
      transform: scale(1);
      box-shadow: var(--lg-tile-shadow);
    }
  }

  .tile:active,
  .tile:active .tile__face {
    transform: rotate(var(--tilt, 0deg)) scale(1);
  }

  .tile__face {
    transform: scale(1);
  }
}