/* ── 2048 ──
   The board is a square; gaps and tiles are percentages of its width, so it
   scales freely. Tiles are absolutely positioned and slide by transitioning
   transform from cell (--x, --y) to cell. */

/* ── Palette (dark is the site default) ── */
.tz-game {
  --tz-board: #0a0e17;
  --tz-cell: #182033;
  --tz-dark-text: #1d1d22;
  --tz-light-text: #ffffff;
  --tz-2: #26324c;
  --tz-4: #34466b;
  --tz-2-text: #e6e6eb;
  --tz-8: #f2a15a;
  --tz-16: #f58a4b;
  --tz-32: #f26b5b;
  --tz-64: #e84b3c;
  --tz-128: #edcf72;
  --tz-256: #edcc61;
  --tz-512: #edc850;
  --tz-1024: #edc53f;
  --tz-2048: #edc22e;
  --tz-super: #7aa2f7;
}

[data-theme="light"] .tz-game {
  --tz-board: #b3b7bf;
  --tz-cell: #c9ccd2;
  --tz-2: #eef0f3;
  --tz-4: #e3e7f0;
  --tz-2-text: #3d3f47;
  --tz-super: #3b6cc2;
}

/* ── Card, scores and controls ── */
.game-card.tz-card {
  max-width: 32rem;
  margin: 0 auto;
  opacity: 1;
  transform: none;
}

.tz-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}

.tz-controls {
  margin: 0;
}

.tz-scores {
  display: flex;
  gap: 0.5rem;
}

.tz-scorebox {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 4.8rem;
  padding: 0.3rem 0.8rem 0.35rem;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background: var(--btn-bg);
  line-height: 1.2;
}

[data-theme="light"] .tz-scorebox {
  border-color: var(--btn-border);
}

.tz-scorelabel {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.tz-scorebox strong {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}

/* "+N" drifts up out of the score box after a merge */
.tz-gain {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.tz-gain-float {
  position: absolute;
  left: 0;
  right: 0;
  top: 40%;
  text-align: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--accent);
  animation: tz-float 0.7s ease-out forwards;
}

@keyframes tz-float {
  from { transform: translateY(0); opacity: 1; }
  to   { transform: translateY(-2.2rem); opacity: 0; }
}

/* ── Board ── */
.tz-board {
  --tz-gap: 3%;
  position: relative;
  width: 100%;
  max-width: 28rem;
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 12px;
  background: var(--tz-board);
  container-type: inline-size;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.tz-cells {
  position: absolute;
  inset: var(--tz-gap);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  /* The gap between cells, as a share of the inset area: 3 / 94 of it */
  gap: calc(100% * 3 / 94);
}

.tz-cells span {
  border-radius: 8px;
  background: var(--tz-cell);
}

.tz-tiles {
  position: absolute;
  inset: 0;
}

/* Each tile is 21.25% of the board; one step is a tile plus a 3% gap,
   which is 24.25 / 21.25 of the tile's own size */
.tz-tile {
  position: absolute;
  left: var(--tz-gap);
  top: var(--tz-gap);
  width: 21.25%;
  height: 21.25%;
  transform: translate(calc(var(--x) * 114.1176%), calc(var(--y) * 114.1176%));
  transition: transform 100ms ease-in-out;
  z-index: 1;
}

.tz-tile.is-merged {
  z-index: 2;
}

.tz-inner {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  border-radius: 8px;
  font-weight: 800;
  font-size: 11cqw;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  background: var(--tz-bg, var(--tz-2));
  color: var(--tz-fg, var(--tz-dark-text));
}

.tz-tile[data-digits="3"] .tz-inner { font-size: 9cqw; }
.tz-tile[data-digits="4"] .tz-inner { font-size: 7cqw; }
.tz-tile[data-digits="5"] .tz-inner,
.tz-tile[data-digits="6"] .tz-inner { font-size: 5.5cqw; }

.tz-tile[data-value="2"]    { --tz-bg: var(--tz-2);    --tz-fg: var(--tz-2-text); }
.tz-tile[data-value="4"]    { --tz-bg: var(--tz-4);    --tz-fg: var(--tz-2-text); }
.tz-tile[data-value="8"]    { --tz-bg: var(--tz-8); }
.tz-tile[data-value="16"]   { --tz-bg: var(--tz-16); }
.tz-tile[data-value="32"]   { --tz-bg: var(--tz-32);   --tz-fg: var(--tz-light-text); }
.tz-tile[data-value="64"]   { --tz-bg: var(--tz-64);   --tz-fg: var(--tz-light-text); }
.tz-tile[data-value="128"]  { --tz-bg: var(--tz-128); }
.tz-tile[data-value="256"]  { --tz-bg: var(--tz-256); }
.tz-tile[data-value="512"]  { --tz-bg: var(--tz-512); }
.tz-tile[data-value="1024"] { --tz-bg: var(--tz-1024); }
.tz-tile[data-value="2048"] { --tz-bg: var(--tz-2048); }
.tz-tile[data-value="super"] { --tz-bg: var(--tz-super); --tz-fg: var(--tz-light-text); }

/* Big tiles glow a little */
.tz-tile[data-value="128"] .tz-inner,
.tz-tile[data-value="256"] .tz-inner,
.tz-tile[data-value="512"] .tz-inner,
.tz-tile[data-value="1024"] .tz-inner,
.tz-tile[data-value="2048"] .tz-inner {
  box-shadow: 0 0 18px rgba(237, 200, 80, 0.35);
}

.tz-tile.is-new .tz-inner {
  animation: tz-appear 0.18s ease-out;
}

.tz-tile.is-merged .tz-inner {
  animation: tz-pop 0.18s ease-out;
}

@keyframes tz-appear {
  from { transform: scale(0); opacity: 0; }
}

@keyframes tz-pop {
  50% { transform: scale(1.15); }
}

.reduce-motion .tz-tile { transition: none; }
.reduce-motion .tz-tile.is-new .tz-inner,
.reduce-motion .tz-tile.is-merged .tz-inner { animation: none; }

/* ── End-of-game overlay ── */
.tz-overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  text-align: center;
  border-radius: 12px;
  background: rgba(10, 14, 23, 0.72);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  color: #e6e6eb;
  animation: tz-fade 0.4s ease;
}

[data-theme="light"] .tz-overlay {
  background: rgba(236, 238, 241, 0.8);
  color: var(--fg);
}

.tz-game[data-status="won"] .tz-overlay {
  background: rgba(237, 194, 46, 0.55);
  color: #1d1d22;
}

.tz-overlay[hidden] {
  display: none;
}

@keyframes tz-fade {
  from { opacity: 0; }
}

.tz-overlay-title {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 800;
}

.tz-overlay-msg {
  margin: 0;
  font-size: 0.9rem;
}

.tz-overlay-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.tz-overlay button {
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1.2rem;
  border-radius: 8px;
  cursor: pointer;
}

.tz-btn-main {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--bg);
}

.tz-btn-alt {
  border: 1px solid currentColor;
  background: transparent;
  color: inherit;
}

.tz-overlay button:hover {
  filter: brightness(1.1);
}

.tz-overlay button:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

/* ── Status and help ── */
/* Announced to screen readers; the overlay shows the same thing */
.tz-status {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.tz-help {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
  text-align: center;
}

.tz-help-touch {
  display: none;
}

@media (pointer: coarse) {
  .tz-help-keys { display: none; }
  .tz-help-touch { display: inline; }
}

.tz-help kbd {
  display: inline-block;
  min-width: 1.5em;
  padding: 0 0.3em;
  font-family: inherit;
  font-size: 0.72rem;
  line-height: 1.5;
  text-align: center;
  border-radius: 4px;
  border: 1px solid var(--card-border);
  background: var(--btn-bg);
  color: var(--fg);
}

[data-theme="light"] .tz-help kbd {
  border-color: var(--btn-border);
}