/* ============================================================ game layout */

/*
 * The game and everything about it side by side: the board on the left as
 * the stage, the rules and the board's top ten in a column beside it. The
 * leaderboard used to be stacked under the board, so reading it meant
 * scrolling the game out of view.
 *
 * Nothing is boxed. The board stands on the page; one vertical rule sets
 * the column apart, and hairlines divide what is in it.
 */
.game-page {
  padding-block: clamp(1.75rem, 3.5vw, 2.75rem) 0;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 20rem);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}

.game-layout > .game-workspace {
  width: 100%;
  max-width: none;
}

.game-layout > .game-workspace > * {
  max-width: 38rem;
}

.game-layout > .game-workspace--compact > * {
  max-width: 30rem;
}

.game-layout > .game-workspace--wide > * {
  max-width: none;
}

.game-aside {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  display: grid;
  padding-left: clamp(1.5rem, 3vw, 2.25rem);
  border-left: 1px solid var(--color-line);
}

.game-panel {
  padding-bottom: var(--space-5);
}

.game-panel + .game-panel {
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-line);
}

.game-panel__head {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.game-panel__title {
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  font-weight: 700;
}

.game-panel__head .game-panel__title {
  margin: 0;
}

.game-panel__link {
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
}

.game-panel__link:hover {
  text-decoration: underline;
}

.game-howto {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  counter-reset: howto;
  list-style: none;
}

.game-howto li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--color-text-soft);
  font-size: var(--text-sm);
  line-height: 1.6;
  counter-increment: howto;
}

/* Plain numerals in the section colour — the order is the information. */
.game-howto li::before {
  content: counter(howto);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-accent);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.game-leaderboard__status:empty {
  display: none;
}

.game-leaderboard__actions {
  margin-top: var(--space-3);
}

.game-leaderboard__actions .button {
  min-height: 2.25rem;
  padding-inline: var(--space-4);
  font-size: var(--text-sm);
}

.game-leaderboard__refresh {
  margin-left: auto;
}

.game-more {
  padding-block: clamp(3rem, 6vw, 4.5rem) var(--section-space);
}

@media (max-width: 60rem) {
  .game-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .game-aside {
    position: static;
    padding-top: var(--space-5);
    padding-left: 0;
    border-top: 1px solid var(--color-line);
    border-left: 0;
  }
}

/* ============================================================ score rows */

/*
 * One row per result, as in lazer's RankingsTable: alternate rows carry a
 * faint band, the top three wear a medal colour on their rank, and the
 * highlight under the pointer arrives quickly and leaves slowly.
 */
.board-rows {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.board-row,
.board-columns {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) minmax(6rem, auto) minmax(0, 10rem) 6.5rem;
  gap: var(--space-3);
  align-items: center;
  min-height: 2.9rem;
  padding-inline: var(--space-3);
}

.board-rows--compact .board-row {
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  min-height: 2.5rem;
  padding-inline: var(--space-2);
}

.board-row {
  position: relative;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  transition: background-color 600ms var(--ease-out-quint);
}

.board-row:nth-child(odd) {
  background: color-mix(in srgb, var(--color-text) 3.5%, transparent);
}

.board-row:hover {
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  transition-duration: 100ms;
}

.board-columns {
  min-height: 2rem;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  font-weight: 600;
}

.board-row__rank {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 1.6rem;
  border-radius: 999px;
  color: var(--color-text-muted);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.board-rows--compact .board-row__rank {
  width: 1.7rem;
}

/* The leader is marked in the accent; second and third in ink. No medal
 * colours — the numbers already say the order. */
.board-row[data-rank="1"] .board-row__rank { background: var(--color-accent); color: var(--color-on-accent); }
.board-row[data-rank="2"] .board-row__rank,
.board-row[data-rank="3"] .board-row__rank { background: var(--color-band-strong); color: var(--color-text); }

.board-row__name {
  overflow: hidden;
  color: var(--color-text);
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.board-row__score {
  color: var(--color-text);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.board-row__detail,
.board-row__date {
  overflow: hidden;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.board-row__date {
  text-align: right;
}

.board-columns span:nth-child(3),
.board-columns span:nth-child(5) {
  text-align: right;
}

.board-note {
  margin: 0;
  padding: var(--space-6) var(--space-2);
  color: var(--color-text-muted);
  text-align: center;
}

.board-loading {
  display: grid;
  place-items: center;
  min-height: 6rem;
}

/* lazer's LoadingSpinner: a quarter turn per beat, InOutQuart, never a
 * constant spin. */
.loading-spinner {
  width: 1.6rem;
  height: 1.6rem;
  border: 3px solid var(--color-accent);
  border-radius: 0.45rem;
  animation: spinner-beat 2400ms infinite;
}

@keyframes spinner-beat {
  0% { transform: rotate(0deg); animation-timing-function: cubic-bezier(0.76, 0, 0.24, 1); }
  25% { transform: rotate(90deg); animation-timing-function: cubic-bezier(0.76, 0, 0.24, 1); }
  50% { transform: rotate(180deg); animation-timing-function: cubic-bezier(0.76, 0, 0.24, 1); }
  75% { transform: rotate(270deg); animation-timing-function: cubic-bezier(0.76, 0, 0.24, 1); }
  100% { transform: rotate(360deg); }
}

html.motion-none .loading-spinner {
  animation: none;
}

/* Columns drop by the width the table actually has, not the window's: the
 * leaderboard page gives it much less than the viewport beside its list. */
.board-body {
  container-type: inline-size;
}

@container (max-width: 40rem) {
  .board-row,
  .board-columns {
    grid-template-columns: 2.6rem minmax(0, 1fr) auto 5.5rem;
  }

  .board-row__detail,
  .board-columns span:nth-child(4) {
    display: none;
  }
}

@container (max-width: 26rem) {
  .board-row,
  .board-columns {
    grid-template-columns: 2.4rem minmax(0, 1fr) auto;
  }

  .board-row__date,
  .board-columns span:nth-child(5) {
    display: none;
  }
}

/* ======================================================= leaderboard page */

.board-layout {
  display: grid;
  grid-template-columns: minmax(13rem, 16rem) minmax(0, 1fr);
  gap: clamp(1.25rem, 2.5vw, 2rem);
  align-items: start;
}

.board-nav {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  display: grid;
  gap: 2px;
  max-height: calc(100vh - var(--header-height) - 2rem);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  /* The list scrolls when it is taller than the window, but only shows a
   * track while the pointer is over it. */
  scrollbar-color: transparent transparent;
}

.board-nav:hover {
  scrollbar-color: var(--color-rule) transparent;
}

.board-nav__group {
  margin: var(--space-4) 0 var(--space-1);
  padding-inline: var(--space-3);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  font-weight: 700;
}

.board-nav__group:first-child {
  margin-top: 0;
}

.board-nav__item {
  position: relative;
  display: flex;
  gap: var(--space-3);
  align-items: center;
  min-height: 2.6rem;
  padding: 0.3rem var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-soft);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: background-color 600ms var(--ease-out-quint), color 500ms var(--ease-out-quint);
}

.board-nav__item:hover {
  background: color-mix(in srgb, var(--color-text) 6%, transparent);
  color: var(--color-text);
  transition-duration: 100ms;
}

.board-nav__item[aria-current="true"] {
  color: var(--color-accent);
}

.board-nav__item::before {
  content: "";
  position: absolute;
  top: 0.55rem;
  bottom: 0.55rem;
  left: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--color-accent);
  transform: scaleY(0);
  transition: transform 500ms var(--ease-out-quint);
}

.board-nav__item[aria-current="true"]::before {
  transform: scaleY(1);
}

/* Each game in the list carries a small copy of its cover, cropped in to
 * the drawing so it still reads at this size. */
.board-nav__thumb,
.board-head__cover img {
  object-fit: cover;
  object-view-box: inset(15%);
}

.board-nav__thumb {
  flex: none;
  width: 2.5rem;
  height: 2rem;
  border-radius: 0.4rem;
}

/* The board is the page's content, not a box on it: a rule on its left
 * divides it from the list of games. */
.board-panel {
  min-width: 0;
  padding-left: clamp(1.25rem, 3vw, 2.5rem);
  border-left: 1px solid var(--color-line);
}

.board-head {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-line);
}

.board-head__cover {
  position: relative;
  flex: none;
  width: 6rem;
  height: 4.8rem;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-band);
}

.board-head__cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.board-head__text {
  flex: 1;
  min-width: 12rem;
}

.board-head__text h2 {
  margin: 0 0 0.2rem;
  font-size: var(--text-2xl);
}

.board-head__text p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.board-panel.is-switching .board-head > * {
  animation: hero-rise 500ms var(--ease-out-quint) both;
}

.board-panel.is-switching .board-head > :nth-child(2) { animation-delay: 40ms; }
.board-panel.is-switching .board-head > :nth-child(3) { animation-delay: 80ms; }

@media (max-width: 48rem) {
  .board-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .board-panel {
    padding-left: 0;
    border-left: 0;
  }

  .board-nav {
    position: static;
    display: flex;
    gap: var(--space-2);
    max-height: none;
    margin-inline: calc(-1 * var(--gutter));
    padding: 0 var(--gutter) var(--space-2);
    overflow-x: auto;
  }

  .board-nav__group {
    display: none;
  }

  .board-nav__item {
    flex: none;
  }
}

/* ============================================================ game boards */

.game-workspace {
  display: grid;
  gap: var(--space-5);
  justify-items: center;
  max-width: 38rem;
  margin-inline: auto;
}

.game-workspace--compact {
  max-width: 30rem;
}

/* Board games whose field can be far wider than it is tall. */
.game-workspace--wide {
  max-width: 62rem;
}

.game-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  width: 100%;
}

.game-settings {
  display: grid;
  gap: var(--space-3);
  width: 100%;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-line);
}

.game-setting {
  max-width: 15rem;
}

.game-custom {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  gap: var(--space-3);
  align-items: end;
}

.game-custom--small {
  grid-template-columns: minmax(0, 12rem) auto;
}

.game-custom[hidden] {
  display: none;
}

.game-config-status {
  min-height: 1.4rem;
  margin: 0;
}

.game-board-scroll {
  width: 100%;
  /* Gives the board a container to measure its cell width against. */
  container-type: inline-size;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.game-board-scroll--bounded {
  max-height: min(70svh, 44rem);
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.game-help,
.game-check {
  width: 100%;
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.game-inline-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  width: 100%;
}

.game-inline-controls input {
  min-height: var(--button-height);
  min-width: 8rem;
  padding-inline: var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
}

.arcade-grid {
  display: grid;
  grid-template-columns: repeat(var(--arcade-columns), minmax(2.5rem, 1fr));
  width: min(100%, 34rem);
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-sunken);
}

.arcade-cell,
.arcade-column {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 2.75rem;
  padding: 0;
  border: 0;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: transparent;
  color: var(--color-text);
  font-size: var(--text-md);
}

.arcade-cell:hover,
.arcade-column:hover,
.arcade-cell:focus-visible,
.arcade-column:focus-visible {
  background: color-mix(in srgb, var(--color-accent) 10%, var(--color-surface));
}

.arcade-cell[data-player="red"],
.arcade-cell[data-player="black"] { color: var(--color-accent); }
.arcade-cell[data-player="yellow"],
.arcade-cell[data-player="white"] { color: var(--color-text-muted); }

.arcade-column {
  min-height: 2.5rem;
  background: var(--color-surface-sunken);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.simon-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(7rem, 1fr));
  gap: var(--space-3);
  width: min(100%, 20rem);
}

.simon-button {
  min-height: 6rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: transparent;
  transition: filter var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.simon-button[data-color="red"] { background: color-mix(in srgb, var(--color-error) 70%, var(--color-surface)); }
.simon-button[data-color="blue"] { background: color-mix(in srgb, var(--color-accent) 70%, var(--color-surface)); }
.simon-button[data-color="green"] { background: color-mix(in srgb, var(--color-success) 70%, var(--color-surface)); }
.simon-button[data-color="yellow"] { background: color-mix(in srgb, var(--color-warning) 70%, var(--color-surface)); }
.simon-button[data-active="true"] { filter: brightness(1.35); transform: scale(0.97); }

.nim-stones {
  width: min(100%, 28rem);
  min-height: 4rem;
  padding: var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  font-size: clamp(1.4rem, 5vw, 2.5rem);
  letter-spacing: 0.25rem;
  overflow-wrap: anywhere;
}

.hangman-word,
.typing-prompt {
  width: 100%;
  margin: 0;
  text-align: center;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: var(--text-xl);
  letter-spacing: 0.18em;
}

.letter-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(2.5rem, 1fr));
  gap: var(--space-2);
  width: min(100%, 30rem);
}

.letter-button {
  min-height: 2.75rem;
  padding: 0;
}

@media (max-width: 30rem) {
  .arcade-grid { grid-template-columns: repeat(var(--arcade-columns), minmax(2rem, 1fr)); }
  .arcade-cell { min-height: 2.25rem; font-size: 0.95rem; }
  .letter-grid { grid-template-columns: repeat(6, minmax(2.4rem, 1fr)); }
}

.game-check {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  min-height: 2.75rem;
}

.game-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  width: 100%;
  min-height: 3rem;
}

.game-status {
  flex: 1;
  min-width: 10rem;
  margin: 0;
  color: var(--color-text-soft);
  font-weight: 600;
}

.score-pair {
  display: flex;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.tic-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(4rem, 6.75rem));
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-text);
}

.tic-cell {
  aspect-ratio: 1;
  border: 0;
  border-right: 1px solid var(--color-text);
  border-bottom: 1px solid var(--color-rule);
  background: transparent;
  color: var(--color-text);
  font-size: clamp(2rem, 8vw, 3.75rem);
  font-weight: 620;
  transition: background-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

.tic-cell:hover:not(:disabled) {
  background: var(--color-surface);
}

.tic-cell[data-value="X"] {
  color: var(--color-seal);
}

.tic-cell[data-winning="true"] {
  background: color-mix(in srgb, var(--color-seal) 12%, var(--color-bg));
}

.tic-board[data-speed="true"] {
  border-color: var(--color-seal);
}

.tic-cell:disabled {
  cursor: default;
}

.board-2048 {
  display: grid;
  grid-template-columns: repeat(4, minmax(3.6rem, 5.5rem));
  gap: var(--space-2);
  padding: var(--space-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  touch-action: none;
}

.tile-2048 {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-size: clamp(1.1rem, 4vw, 1.65rem);
  font-weight: 720;
  font-variant-numeric: tabular-nums;
}

.tile-2048[data-value="2"],
.tile-2048[data-value="4"] {
  background: color-mix(in srgb, var(--color-accent) 8%, var(--color-bg));
}

.tile-2048[data-value="8"],
.tile-2048[data-value="16"] {
  background: color-mix(in srgb, var(--color-accent) 18%, var(--color-bg));
}

.tile-2048[data-value="32"],
.tile-2048[data-value="64"] {
  background: color-mix(in srgb, var(--color-accent) 32%, var(--color-bg));
}

.tile-2048[data-value="128"],
.tile-2048[data-value="256"],
.tile-2048[data-value="512"] {
  background: color-mix(in srgb, var(--color-accent) 58%, var(--color-bg));
  color: var(--color-on-accent);
}

.tile-2048[data-value="1024"],
.tile-2048[data-value="2048"] {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.direction-pad {
  display: grid;
  grid-template-columns: repeat(3, 3rem);
  gap: var(--space-1);
  justify-content: center;
}

.direction-pad button {
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-weight: 720;
}

.direction-pad button:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.direction-pad [data-snake-move="up"],
.direction-pad [data-move="up"] { grid-column: 2; grid-row: 1; }
.direction-pad [data-snake-move="left"],
.direction-pad [data-move="left"] { grid-column: 1; grid-row: 2; }
.direction-pad [data-snake-move="right"],
.direction-pad [data-move="right"] { grid-column: 3; grid-row: 2; }
.direction-pad [data-snake-move="down"],
.direction-pad [data-move="down"] { grid-column: 2; grid-row: 3; }

.memory-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(3.6rem, 5.25rem));
  gap: var(--space-2);
}

.memory-card {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: transparent;
  font-size: var(--text-xl);
  font-weight: 720;
  transition: transform var(--duration-normal) var(--ease-out), background-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

.memory-card:hover:not(:disabled) {
  border-color: var(--color-accent);
}

.memory-card[data-revealed="true"],
.memory-card[data-matched="true"] {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.memory-card[data-matched="true"] {
  background: var(--color-surface-strong);
  color: var(--color-text);
}

/*
 * The board is sized by its container, not by a fixed cell size. A fixed 2rem
 * cell meant a 30-column field was always 960px wide and scrolled inside the
 * workspace no matter how large the screen was.
 *
 * Columns are fractions, so the grid fills the width it is given. The clamp
 * caps how large cells grow on small fields and sets a tappable floor on big
 * ones; when the floor wins, the board frame scrolls — the right outcome for a
 * 50-column field on a phone, and only then.
 */
.mine-board {
  --mine-cell-max: 2.25rem;
  --mine-cell-min: 1.375rem;
  /* How tall the board frame is allowed to get; the wrapper uses the same. */
  --mine-frame-height: min(70svh, 44rem);
  display: grid;
  grid-template-columns: repeat(var(--mine-columns, 8), minmax(0, 1fr));
  /*
   * Cells are square, so width also decides height. A tall field like 30x30
   * has to be narrowed to the height budget or it scrolls vertically on a
   * screen that could have shown it whole.
   */
  width: clamp(
    calc(var(--mine-columns, 8) * var(--mine-cell-min)),
    min(100%, calc(var(--mine-frame-height) * var(--mine-columns, 8) / var(--mine-rows, 8))),
    calc(var(--mine-columns, 8) * var(--mine-cell-max))
  );
  margin-inline: auto;
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
  /* Numbers track the cell size so they stay legible as the field widens. */
  font-size: clamp(0.6875rem, calc(100cqi / var(--mine-columns, 8) * 0.46), 0.9375rem);
}

@media (pointer: coarse) {
  .mine-board {
    --mine-cell-min: 1.75rem;
  }
}

/*
 * Revealed numbers remain buttons so they can be chorded. They must not look
 * or behave like unopened cells: no hover lift, and a pointer only when the
 * chord is actually available.
 */
.mine-cell[data-revealed="true"] {
  cursor: default;
}

.mine-cell[data-chordable="true"]:not(:disabled) {
  cursor: pointer;
}

.mine-cell[data-chordable="true"]:not(:disabled):hover {
  background: var(--color-accent-wash);
}

.mine-cell {
  aspect-ratio: 1;
  min-width: 0;
  padding: 0;
  border: 0;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: inherit;
  font-weight: 720;
  line-height: 1;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.mine-cell:hover:not(:disabled) {
  background: var(--color-surface-strong);
}

.mine-cell[data-revealed="true"] {
  background: var(--color-bg);
}

.mine-cell[data-mine="true"] {
  color: var(--color-error);
}

.mine-cell[data-number="1"],
.mine-cell[data-number="4"] { color: var(--color-text); }
.mine-cell[data-number="2"],
.mine-cell[data-number="5"] { color: var(--color-success); }
.mine-cell[data-number="3"],
.mine-cell[data-number="6"] { color: var(--color-error); }

.snake-board {
  width: min(100%, 22.5rem);
  height: auto;
  border: 1px solid var(--color-text);
  background: var(--color-surface);
  touch-action: none;
}

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, minmax(2rem, 2.7rem));
  width: min(100%, 24.3rem);
  border-top: 2px solid var(--color-text);
  border-left: 2px solid var(--color-text);
}

.sudoku-cell {
  min-width: 0;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  border-radius: 0;
  background: var(--color-bg);
  color: var(--color-accent);
  text-align: center;
  font-size: clamp(1rem, 3vw, 1.25rem);
  font-weight: 650;
}

.sudoku-cell:nth-child(3n) { border-right: 2px solid var(--color-rule); }
.sudoku-cell:nth-child(n + 19):nth-child(-n + 27),
.sudoku-cell:nth-child(n + 46):nth-child(-n + 54) { border-bottom: 2px solid var(--color-rule); }
.sudoku-cell[data-fixed="true"] { background: var(--color-surface); color: var(--color-text); }
.sudoku-cell[data-invalid="true"] { background: color-mix(in srgb, var(--color-error) 12%, var(--color-bg)); color: var(--color-error); }

.fifteen-board,
.lights-board {
  display: grid;
  width: min(100%, 24rem);
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-text);
}

.fifteen-board { grid-template-columns: repeat(4, 1fr); }
.lights-board {
  grid-template-columns: repeat(var(--lights-size, 6), var(--lights-cell-size, 3.5rem));
  width: max-content;
  margin-inline: auto;
}

.fifteen-cell,
.lights-cell {
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  border-radius: 0;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-xl);
  font-weight: 680;
}

.fifteen-cell:hover:not(:disabled),
.lights-cell:hover:not(:disabled) {
  background: var(--color-surface-strong);
}

.fifteen-cell[data-empty="true"] {
  background: var(--color-bg);
}

.lights-cell[data-on="true"] {
  background: var(--color-accent);
  box-shadow: inset 0 0 0 2px var(--color-bg);
}

.lights-cell[data-hint="true"] {
  outline: 3px solid var(--color-text);
  outline-offset: -5px;
}

.reaction-target {
  display: grid;
  width: 100%;
  min-height: clamp(14rem, 45vw, 22rem);
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-xl);
  font-weight: 680;
}

.reaction-target[data-state="waiting"] {
  background: var(--color-surface-strong);
}

.reaction-target[data-state="ready"] {
  border-color: var(--color-success);
  background: var(--color-success);
  color: #fff;
}

@media (max-width: 48rem) {
  .game-toolbar {
    justify-content: center;
  }

  .game-status {
    flex-basis: 100%;
    text-align: center;
  }

  .game-options {
    grid-template-columns: 1fr;
  }

  .game-custom {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .game-custom .button {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .game-custom--small {
    grid-template-columns: minmax(0, 12rem);
  }
}

@media (max-width: 26rem) {
  .board-2048,
  .memory-board {
    grid-template-columns: repeat(4, minmax(3.2rem, 1fr));
    width: 100%;
  }

  .sudoku-board {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .memory-card { transition: none; }
}

/* ===================================================== whack-a-mole ===== */

.whack-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(0.5rem, 1.6vw, 0.9rem);
  width: min(100%, 24rem);
  margin-inline: auto;
}

.whack-hole {
  position: relative;
  aspect-ratio: 1;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-sunken);
  overflow: hidden;
  touch-action: manipulation;
}

/* The mole is drawn, not imaged: a disc that rises out of the hole. */
.whack-hole::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  background: var(--color-accent);
  transform: translateY(115%) scale(0.85);
  transition: transform var(--dur-normal) var(--ease-elastic);
}

.whack-hole[data-up="true"]::after {
  transform: translateY(0) scale(1);
}

.whack-hole[data-hit="true"] {
  animation: whack-hit 260ms var(--ease-out);
}

.whack-hole[data-miss="true"] {
  animation: whack-miss 260ms var(--ease-out);
}

@keyframes whack-hit {
  0% { background: color-mix(in srgb, var(--color-success) 45%, var(--color-surface-sunken)); transform: scale(0.94); }
  100% { background: var(--color-surface-sunken); transform: none; }
}

@keyframes whack-miss {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* ======================================================= schulte grid === */

.schulte-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.4rem;
  width: min(100%, 26rem);
  margin-inline: auto;
}

.schulte-cell {
  aspect-ratio: 1;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: clamp(0.95rem, 3.5vw, 1.35rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  touch-action: manipulation;
  transition:
    background-color var(--duration-fast) ease,
    color var(--duration-fast) ease,
    transform var(--dur-release) var(--ease-elastic);
}

.schulte-cell:hover:not(:disabled) {
  background: var(--color-accent-wash);
}

.schulte-cell[data-done="true"] {
  background: var(--color-accent);
  border-color: transparent;
  color: var(--color-on-accent);
  transform: scale(0.9);
}

.schulte-cell[data-wrong="true"] {
  animation: whack-miss 260ms var(--ease-out);
  background: color-mix(in srgb, var(--color-error) 22%, var(--color-surface));
}

/* ==================================================== quick math ======== */

.math-board,
.stroop-board {
  display: grid;
  gap: var(--space-5);
  justify-items: center;
  width: min(100%, 28rem);
  margin-inline: auto;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

.math-question,
.stroop-word {
  margin: 0;
  font-size: clamp(1.9rem, 7vw, 3rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.math-options,
.stroop-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  width: 100%;
}

.math-choice,
.stroop-choice {
  font-variant-numeric: tabular-nums;
}

.math-choice[data-wrong="true"],
.stroop-choice[data-wrong="true"] {
  animation: whack-miss 300ms var(--ease-out);
  border-color: var(--color-error);
  color: var(--color-error);
}

/* The colour a Stroop option stands for, shown as a dot so the choice is
 * still usable when the label and the ink disagree. */
.stroop-choice::before {
  content: "";
  width: 0.6rem;
  height: 0.6rem;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: var(--swatch, currentColor);
}

.stroop-word {
  transition: color var(--duration-fast) ease;
}