@import url("../../shared/number-games/boards.css?v=e9cce863534ad2d32c9f5c620d417ed8adf9ac68");

.howto-tutorial {
  margin-top: 12px;
}

.howto-tutorial-intro {
  margin-bottom: 16px;
}

.howto-tutorial-shell {
  border: 1px solid var(--line);
  border-radius: var(--radius-md, 12px);
  padding: 16px;
  background: var(--bg-2, rgba(255, 255, 255, 0.4));
}

.howto-tutorial-head {
  margin-bottom: 12px;
}

.howto-tutorial-progress {
  margin: 0 0 6px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent, #956300);
}

.howto-tutorial-instruction {
  margin: 0;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.5;
}

.howto-tutorial-error {
  margin: 8px 0 0;
  color: var(--bad, #b42318);
  font-size: 0.92rem;
}

.howto-tutorial-binary,
.howto-tutorial-play {
  display: grid;
  gap: 16px;
  justify-items: center;
  width: 100%;
  align-items: center;
}

.howto-tutorial-binary-grid,
.howto-tutorial-kakuro-grid,
.howto-tutorial-futoshiki-grid {
  display: grid;
  width: min(100%, 280px);
  aspect-ratio: 1;
  gap: 0;
  border: 3px solid var(--grid-strong, #3a2d22);
  border-radius: 6px;
  background: var(--grid-strong, #3a2d22);
  box-shadow: var(--shadow, 0 8px 24px rgba(0, 0, 0, 0.08));
}

.howto-tutorial-futoshiki-grid {
  aspect-ratio: auto;
  min-height: 200px;
}

.howto-tutorial-cell.clue {
  position: relative;
  background: var(--cell, #fff9e8);
  cursor: default;
  padding: 0;
  overflow: hidden;
}

.howto-tutorial-cell.clue .kakuro-diag {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom right,
    transparent calc(50% - 0.5px),
    var(--grid-thin, rgba(0, 0, 0, 0.2)) calc(50% - 0.5px),
    var(--grid-thin, rgba(0, 0, 0, 0.2)) calc(50% + 0.5px),
    transparent calc(50% + 0.5px)
  );
  pointer-events: none;
}

.howto-tutorial-cell.clue .kakuro-down {
  position: absolute;
  left: 4px;
  bottom: 2px;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--ink-strong, #241a14);
  line-height: 1;
}

.howto-tutorial-cell.clue .kakuro-across {
  position: absolute;
  right: 3px;
  top: 2px;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--ink-strong, #241a14);
  line-height: 1;
}

.howto-tutorial-cell.black {
  background: var(--grid-strong, #3a2d22);
  cursor: default;
  border-color: transparent;
}

.howto-tutorial-ineq {
  display: grid;
  place-items: center;
  font-size: clamp(0.72rem, 3.4vw, 1rem);
  font-weight: 700;
  color: var(--game-futoshiki, var(--cta, #c88708));
  pointer-events: none;
  user-select: none;
}

.howto-tutorial-cell {
  display: grid;
  place-items: center;
  background: var(--cell, #fff9e8);
  border-right: 1px solid var(--grid-thin, rgba(0, 0, 0, 0.12));
  border-bottom: 1px solid var(--grid-thin, rgba(0, 0, 0, 0.12));
  font-size: clamp(1.1rem, 4vw, 1.6rem);
  font-weight: 600;
  color: var(--entry, #1d4ed8);
  cursor: pointer;
  user-select: none;
  min-height: 44px;
}

.howto-tutorial-cell.is-given {
  color: var(--ink-strong, #241a14);
  font-weight: 700;
  cursor: default;
}

.howto-tutorial-binary .howto-tutorial-cell.is-selected {
  box-shadow: inset 0 0 0 2px var(--sel, #956300);
  background: var(--sel-bg, rgba(149, 99, 0, 0.12));
}

.howto-tutorial-cell.is-focus {
  box-shadow: inset 0 0 0 2px var(--gold, var(--accent));
}

.howto-tutorial-binary .howto-tutorial-cell.is-highlight:not(.is-selected) {
  background: var(--gold-wash, color-mix(in srgb, var(--gold, var(--accent)) 16%, transparent));
}

.howto-tutorial-cell.is-locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.howto-tutorial-keypad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  width: min(100%, 280px);
}

/* Same keypad surface as the Binary play board (--board-key), not a second button system. */
.howto-tutorial-keypad button {
  min-height: 44px;
  min-width: 44px;
  padding: 8px 6px;
  font: inherit;
  font-size: 1.15rem;
  font-variant-numeric: lining-nums;
  line-height: 1.2;
  white-space: normal;
  border-radius: var(--radius-sm, 8px);
  border: 1px solid var(--board-key-line, var(--line));
  background: var(--board-key, var(--paper-bright));
  color: var(--ink);
  box-shadow: var(--shadow-1, none);
  cursor: pointer;
}

.howto-tutorial-keypad button:hover {
  border-color: var(--cta, #c88708);
}

.howto-tutorial-keypad button.ghost {
  font-size: 0.85rem;
}

.howto-tutorial-keypad.is-digits [data-digit="clear"] {
  grid-column: 1 / -1;
}

/* Sudoku and Killer reuse the Binary keypad surface and the same board tokens. */
.howto-tutorial-digits {
  display: grid;
  gap: 16px;
  justify-items: center;
  width: 100%;
  align-items: center;
}

.howto-tutorial-digits-grid {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  grid-template-rows: repeat(9, minmax(0, 1fr));
  width: min(100%, 320px);
  aspect-ratio: 1;
  gap: 0;
  border: 3px solid var(--grid-strong, var(--board-line-strong, #3a2d22));
  border-radius: 6px;
  background: var(--grid-strong, var(--board-line-strong, #3a2d22));
  box-shadow: var(--shadow, 0 8px 24px rgba(0, 0, 0, 0.08));
}

.howto-tutorial-digits .howto-tutorial-cell {
  position: relative;
  min-height: 0;
  overflow: hidden;
  font-family: var(--font-digits, inherit);
  font-size: clamp(0.72rem, 2.5vw, 1.05rem);
  font-variant-numeric: lining-nums;
  font-weight: var(--weight-entry, 600);
  color: var(--entry, var(--board-digit, #1d4ed8));
}

.howto-tutorial-digits-grid .howto-tutorial-cell:nth-child(3n) {
  border-right: 3px solid var(--grid-strong, var(--board-line-strong, #3a2d22));
}

.howto-tutorial-digits-grid .howto-tutorial-cell:nth-child(9n) {
  border-right: none;
}

.howto-tutorial-digits-grid .howto-tutorial-cell:nth-child(n + 19):nth-child(-n + 27),
.howto-tutorial-digits-grid .howto-tutorial-cell:nth-child(n + 46):nth-child(-n + 54) {
  border-bottom: 3px solid var(--grid-strong, var(--board-line-strong, #3a2d22));
}

.howto-tutorial-digits-grid .howto-tutorial-cell:nth-child(n + 73) {
  border-bottom: none;
}

.howto-tutorial-cell.is-conflict {
  background-color: var(--board-cell-bad, rgba(180, 35, 24, 0.14));
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 3px,
    color-mix(in srgb, var(--board-digit-bad, var(--bad, #b42318)) 16%, transparent) 3px,
    color-mix(in srgb, var(--board-digit-bad, var(--bad, #b42318)) 16%, transparent) 5px
  );
  color: var(--board-digit-bad, var(--bad, #b42318));
  box-shadow: inset 0 -3px 0 0 var(--board-digit-bad, var(--bad, #b42318));
}

.howto-tutorial-cell.is-selected.is-conflict {
  outline: 2px solid var(--sel, #956300);
  outline-offset: -4px;
}

/* Killer cages: same pastel fills and dotted walls as live play. */
.howto-tutorial-killer .howto-tutorial-cell[data-cage="a"] { --cage-hue: var(--indigo); }
.howto-tutorial-killer .howto-tutorial-cell[data-cage="b"] { --cage-hue: var(--vermillon); }
.howto-tutorial-killer .howto-tutorial-cell[data-cage="c"] { --cage-hue: var(--matcha); }
.howto-tutorial-killer .howto-tutorial-cell[data-cage="d"] { --cage-hue: #B47A19; }
.howto-tutorial-killer .howto-tutorial-cell[data-cage="e"] { --cage-hue: #8D5BB0; }
.howto-tutorial-killer .howto-tutorial-cell[data-cage="f"] { --cage-hue: #238F96; }

.howto-tutorial-killer .howto-tutorial-cell[data-cage] {
  --cage-color: color-mix(in srgb, var(--cage-hue) 14%, var(--board-cell, var(--cell, #fff9e8)));
  --cage-border: color-mix(in srgb, var(--cage-hue) 48%, var(--line));
  background-color: var(--cage-color);
  overflow: visible;
}

.howto-tutorial-killer .howto-tutorial-cell.is-highlight:not(.is-selected):not(.is-conflict) {
  background-color: color-mix(in srgb, var(--gold, #c9a227) 22%, var(--cage-color, var(--cell, #fff9e8)));
  background-image: none;
}

.howto-tutorial-killer .howto-tutorial-cell.is-selected:not(.is-conflict) {
  background-color: var(--board-cell-sel, var(--sel-bg, rgba(149, 99, 0, 0.12)));
  background-image: none;
}

.howto-tutorial-killer .howto-tutorial-cell.is-conflict {
  background-color: var(--board-cell-bad, rgba(180, 35, 24, 0.14));
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 3px,
    color-mix(in srgb, var(--board-digit-bad, var(--bad, #b42318)) 16%, transparent) 3px,
    color-mix(in srgb, var(--board-digit-bad, var(--bad, #b42318)) 16%, transparent) 5px
  );
  color: var(--board-digit-bad, var(--bad, #b42318));
  box-shadow: inset 0 -3px 0 0 var(--board-digit-bad, var(--bad, #b42318));
}

.howto-tutorial-killer .cage-sum {
  position: absolute;
  top: 1px;
  left: 2px;
  z-index: 5;
  padding: 0 2px;
  border-radius: 3px;
  background: color-mix(in srgb, var(--board-cell, var(--cell, #fff9e8)) 88%, transparent);
  color: var(--board-cage-sum, var(--ink-strong, #241a14));
  font-family: var(--font-digits, inherit);
  font-size: clamp(0.5rem, 1.6vw, 0.68rem);
  font-weight: 750;
  line-height: 1;
  letter-spacing: 0;
  pointer-events: none;
}

.howto-tutorial-killer .howto-tutorial-cell.has-cage-sum .digit {
  padding-top: 0.45em;
}

.howto-tutorial-killer .cw {
  position: absolute;
  z-index: 1;
  background: transparent;
  border-color: var(--cage-border, var(--board-cage, var(--ink-strong, #241a14)));
  border-style: dotted;
  pointer-events: none;
}

.howto-tutorial-killer .cw.n {
  top: 2px;
  left: 2px;
  right: 2px;
  height: 0;
  width: auto;
  border-top-width: 1px;
  border-top-style: dotted;
}

.howto-tutorial-killer .cw.s {
  bottom: 2px;
  left: 2px;
  right: 2px;
  height: 0;
  width: auto;
  border-bottom-width: 1px;
  border-bottom-style: dotted;
}

.howto-tutorial-killer .cw.w {
  top: 2px;
  bottom: 2px;
  left: 2px;
  width: 0;
  height: auto;
  border-left-width: 1px;
  border-left-style: dotted;
}

.howto-tutorial-killer .cw.e {
  top: 2px;
  bottom: 2px;
  right: 2px;
  width: 0;
  height: auto;
  border-right-width: 1px;
  border-right-style: dotted;
}

.howto-tutorial-actions {
  margin-top: 12px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.howto-tutorial-complete {
  margin: 0 0 12px;
  color: var(--muted);
}

.howto-tutorial-done .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
}

/* Tablet and up: keypad sits beside the board, same split as Binary play from 761px. */
@media (min-width: 761px) {
  .howto-tutorial-binary,
  .howto-tutorial-play,
  .howto-tutorial-suguru,
  .howto-tutorial-digits {
    grid-template-columns: minmax(0, 320px) minmax(168px, 220px);
    justify-content: center;
    justify-items: stretch;
    align-items: center;
  }

  .howto-tutorial-binary-grid,
  .howto-tutorial-kakuro-grid,
  .howto-tutorial-futoshiki-grid,
  .howto-tutorial-suguru-grid,
  .howto-tutorial-digits-grid,
  .howto-tutorial-sky-grid,
  .howto-tutorial-yakazu-grid,
  .howto-tutorial-keypad,
  .howto-tutorial-binary .howto-tutorial-keypad,
  .howto-tutorial-suguru .howto-tutorial-keypad {
    width: 100%;
  }
}

/* Phone stack. Columns may shrink so a long Clear label does not overflow. */
@media (max-width: 760px) {
  .howto-tutorial-shell {
    padding: 12px;
  }

  .howto-tutorial-binary,
  .howto-tutorial-play,
  .howto-tutorial-suguru,
  .howto-tutorial-digits {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
  }

  .howto-tutorial-binary-grid,
  .howto-tutorial-kakuro-grid,
  .howto-tutorial-futoshiki-grid,
  .howto-tutorial-suguru-grid,
  .howto-tutorial-digits-grid,
  .howto-tutorial-sky-grid,
  .howto-tutorial-yakazu-grid,
  .howto-tutorial-keypad,
  .howto-tutorial-binary .howto-tutorial-keypad,
  .howto-tutorial-suguru .howto-tutorial-keypad {
    width: min(100%, 360px);
  }

  .howto-tutorial-actions {
    justify-content: stretch;
  }

  .howto-tutorial-actions .btn,
  .howto-tutorial-done .btn {
    width: 100%;
  }
}
/* Codebreaker teaching board. Same tokens as live play (board cell, entry ink,
   exact/misplaced marks, digit face). Scoped here because play-shell.css is
   bound to body.ds-codebreaker and is not loaded on how-to pages. */
.howto-tutorial-codebreaker {
  display: grid;
  gap: 12px;
  width: 100%;
  min-width: 0;
}

.howto-tutorial-codebreaker-play {
  display: grid;
  gap: 16px;
  justify-items: center;
  width: 100%;
  align-items: center;
}

.howto-tutorial-codebreaker-board {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  width: min(100%, 360px);
  padding: 14px 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius, 12px);
  background: color-mix(in srgb, var(--game-codebreaker, #E07A5F) 7%, var(--board-cell, var(--paper-bright)));
}

.howto-tutorial-codebreaker .cb-label {
  margin: 0 0 0.35rem;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--ink) 62%, var(--paper));
}

.howto-tutorial-codebreaker .cb-slots {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.howto-tutorial-codebreaker .cb-slot {
  width: clamp(2.2rem, 11vw, 3rem);
  height: clamp(2.5rem, 12vw, 3.3rem);
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 1px solid var(--board-line-strong, var(--ink));
  border-radius: var(--radius-sm, 8px);
  background: var(--board-cell, var(--paper-bright));
  color: var(--board-entry, var(--ink));
  font-family: var(--font-digits);
  font-variant-numeric: tabular-nums lining-nums;
  font-feature-settings: "zero" 0;
  font-size: clamp(1.15rem, 4.5vw, 1.5rem);
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}

.howto-tutorial-codebreaker .cb-slot-hidden {
  background: color-mix(in srgb, var(--paper) 70%, var(--paper-bright));
  color: color-mix(in srgb, var(--ink) 42%, var(--paper));
  border-style: dashed;
  cursor: default;
  min-height: 36px;
}

.howto-tutorial-codebreaker .cb-slot.is-next,
.howto-tutorial-codebreaker .cb-slot.is-focus,
.howto-tutorial-codebreaker .cb-slot[aria-pressed="true"] {
  box-shadow: inset 0 0 0 2.5px var(--cta);
  background: color-mix(in srgb, var(--cta) 20%, var(--board-cell, var(--paper-bright)));
  border-color: var(--cta);
}

.howto-tutorial-codebreaker .cb-slot.is-highlight:not(.is-next) {
  background: color-mix(in srgb, var(--cta) 16%, var(--board-cell, var(--paper-bright)));
}

.howto-tutorial-codebreaker .cb-slot.is-locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.howto-tutorial-codebreaker .howto-tutorial-keypad button {
  font-family: var(--font-digits);
  font-variant-numeric: tabular-nums lining-nums;
  font-feature-settings: "zero" 0;
  touch-action: manipulation;
}

.howto-tutorial-codebreaker .howto-tutorial-keypad button.is-backspace {
  grid-column: span 2;
  font-family: inherit;
  font-feature-settings: normal;
  font-size: 0.85rem;
}

.howto-tutorial-codebreaker .howto-tutorial-keypad button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.howto-tutorial-codebreaker .howto-tutorial-keypad button.is-highlight {
  box-shadow: inset 0 0 0 2px var(--gold, #c9a227);
  background: var(--gold-wash, rgba(201, 162, 39, 0.16));
}

.howto-tutorial-codebreaker .howto-tutorial-keypad button.is-highlight:disabled {
  opacity: 1;
  color: color-mix(in srgb, var(--ink) 48%, var(--paper));
  cursor: not-allowed;
}

.howto-tutorial-codebreaker .howto-tutorial-keypad button.is-press {
  background: color-mix(in srgb, var(--cta) 16%, var(--paper-bright, var(--board-cell)));
}

.howto-tutorial-codebreaker .cb-legend {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.4;
  color: color-mix(in srgb, var(--ink) 68%, var(--paper));
}

.howto-tutorial-codebreaker .cb-history {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}

.howto-tutorial-codebreaker .cb-row {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.3rem 0.45rem;
  min-width: 0;
  font-family: var(--font-digits);
  font-variant-numeric: tabular-nums lining-nums;
  font-feature-settings: "zero" 0;
}

.howto-tutorial-codebreaker .cb-ord {
  flex: 0 0 auto;
  width: 1.15rem;
  color: color-mix(in srgb, var(--ink) 55%, var(--paper));
  font-size: 0.75rem;
}

.howto-tutorial-codebreaker .cb-digits {
  flex: 0 1 auto;
  min-width: 0;
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 0.95rem;
  white-space: nowrap;
}

.howto-tutorial-codebreaker .cb-dots {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 0.16rem;
}

.howto-tutorial-codebreaker .cb-dot {
  width: 0.72rem;
  height: 0.72rem;
  flex: 0 0 auto;
  border-radius: 50%;
  box-sizing: border-box;
}

.howto-tutorial-codebreaker .cb-dot.is-exact {
  background: var(--ok);
  border: 1px solid color-mix(in srgb, var(--ink) 22%, transparent);
}

.howto-tutorial-codebreaker .cb-dot.is-misplaced {
  background: color-mix(in srgb, var(--cta) 28%, var(--paper-bright));
  border: 2.5px solid var(--cta);
}

.howto-tutorial-codebreaker .is-region-highlight {
  background: color-mix(in srgb, var(--cta) 12%, transparent);
  border-radius: var(--radius-sm, 8px);
}

.howto-tutorial-codebreaker .is-region-focus {
  outline: 2px solid var(--cta);
  outline-offset: 3px;
  border-radius: var(--radius-sm, 8px);
}

@media (min-width: 761px) {
  .howto-tutorial-codebreaker-play {
    grid-template-columns: minmax(0, 1fr) minmax(168px, 220px);
    justify-content: center;
    justify-items: stretch;
  }

  .howto-tutorial-codebreaker-board,
  .howto-tutorial-codebreaker .howto-tutorial-keypad {
    width: 100%;
  }
}

@media (max-width: 760px) {
  .howto-tutorial-codebreaker .cb-slot {
    width: clamp(1.9rem, 9.5vw, 2.6rem);
    height: clamp(2.1rem, 10vw, 2.8rem);
    font-size: clamp(1rem, 4vw, 1.28rem);
  }

  .howto-tutorial-codebreaker .cb-digits {
    letter-spacing: 0.05em;
    font-size: 0.88rem;
  }

  .howto-tutorial-codebreaker .cb-dot {
    width: 0.62rem;
    height: 0.62rem;
  }

  .howto-tutorial-codebreaker .cb-legend {
    font-size: 0.75rem;
    line-height: 1.25;
  }
}
/* Shikaku — same region tones and edge geometry as prototype/shikaku/styles.css. */
.howto-tutorial-shikaku {
  display: grid;
  justify-items: center;
  width: 100%;
}

.howto-tutorial-shikaku-grid {
  display: grid;
  width: min(100%, 320px);
  aspect-ratio: 1;
  touch-action: none;
  border: 3px solid var(--board-line-strong, var(--ink));
  background: var(--board-cell, var(--cell));
  box-shadow: var(--shadow, 0 8px 24px rgba(0, 0, 0, 0.08));
}

.howto-tutorial-shikaku .howto-tutorial-cell {
  position: relative;
  border: 1px solid color-mix(in srgb, var(--board-line, var(--line)) 62%, transparent);
  background-color: var(--board-cell, var(--cell));
  color: var(--ink);
  font-weight: 800;
  min-height: 44px;
}

.howto-tutorial-shikaku .howto-tutorial-cell .clue {
  font-size: clamp(1rem, 4vw, 1.35rem);
  font-weight: 800;
  color: var(--ink);
}

.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-0 { background-color: color-mix(in srgb, #D96557 30%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-1 { background-color: color-mix(in srgb, #D7A11E 31%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-2 { background-color: color-mix(in srgb, #6C9F45 30%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-3 { background-color: color-mix(in srgb, #319A8D 30%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-4 { background-color: color-mix(in srgb, #4F7DC2 30%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-5 { background-color: color-mix(in srgb, #6E62B5 30%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-6 { background-color: color-mix(in srgb, #A15AB1 30%, var(--board-cell, var(--cell))); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-tone-7 { background-color: color-mix(in srgb, #C65386 30%, var(--board-cell, var(--cell))); }

.howto-tutorial-shikaku .howto-tutorial-cell.region-edge-top { border-top: 3px solid var(--board-line-strong, var(--ink)); }
.howto-tutorial-shikaku .howto-tutorial-cell.region-edge-left { border-left: 3px solid var(--board-line-strong, var(--ink)); }

.howto-tutorial-shikaku .howto-tutorial-cell.is-drag,
.howto-tutorial-shikaku .howto-tutorial-cell.is-anchor {
  box-shadow: inset 0 0 0 2.5px var(--play-ring-active, #19D65A);
  background-color: var(--board-cell-sel, var(--cell));
}

.howto-tutorial-shikaku .howto-tutorial-cell.is-conflict {
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 2px,
    color-mix(in srgb, var(--bad, #b42318) 28%, transparent) 2px,
    color-mix(in srgb, var(--bad, #b42318) 28%, transparent) 5px
  );
}
.howto-tutorial-shikaku .howto-tutorial-cell.is-area-mismatch {
  background-image: repeating-linear-gradient(-45deg, transparent, transparent 3px, color-mix(in srgb, var(--bad, #b42318) 30%, transparent) 3px, color-mix(in srgb, var(--bad, #b42318) 30%, transparent) 6px);
}

/* Suguru — same tints and four-sided walls as prototype/suguru/styles.css. */
.howto-tutorial-suguru {
  display: grid;
  gap: 16px;
  justify-items: center;
  width: 100%;
  align-items: center;
}

.howto-tutorial-suguru-grid {
  display: grid;
  width: min(100%, 280px);
  aspect-ratio: 1;
  border: 2px solid var(--board-line-strong, var(--ink));
  background: var(--board-cell, var(--cell));
  box-shadow: var(--shadow, 0 8px 24px rgba(0, 0, 0, 0.08));
}

.howto-tutorial-suguru .howto-tutorial-cell {
  position: relative;
  font-weight: 650;
  color: var(--ink);
  background-color: var(--board-cell, var(--cell));
  background-image:
    var(--suguru-wall-n, linear-gradient(transparent, transparent)),
    var(--suguru-wall-e, linear-gradient(transparent, transparent)),
    var(--suguru-wall-s, linear-gradient(transparent, transparent)),
    var(--suguru-wall-w, linear-gradient(transparent, transparent));
  background-position: top, right, bottom, left;
  background-size:
    100% var(--suguru-wall-size, 2px),
    var(--suguru-wall-size, 2px) 100%,
    100% var(--suguru-wall-size, 2px),
    var(--suguru-wall-size, 2px) 100%;
  background-repeat: no-repeat;
  border: 0;
  border-top: 1px solid var(--board-line, var(--line));
  border-left: 1px solid var(--board-line, var(--line));
  padding: 0;
  font-family: inherit;
  font-size: clamp(1.05rem, 4vw, 1.45rem);
  min-height: 44px;
}

.howto-tutorial-suguru .howto-tutorial-cell.is-given {
  font-weight: 800;
  color: var(--board-given, var(--ink));
  cursor: default;
}

.howto-tutorial-suguru .howto-tutorial-cell.tint-1 { background-color: color-mix(in srgb, #D45E3D 10%, var(--board-cell, var(--cell))); }
.howto-tutorial-suguru .howto-tutorial-cell.tint-2 { background-color: color-mix(in srgb, #C88708 10%, var(--board-cell, var(--cell))); }
.howto-tutorial-suguru .howto-tutorial-cell.tint-3 { background-color: color-mix(in srgb, #2E8B7A 10%, var(--board-cell, var(--cell))); }
.howto-tutorial-suguru .howto-tutorial-cell.tint-4 { background-color: color-mix(in srgb, #3547B3 10%, var(--board-cell, var(--cell))); }
.howto-tutorial-suguru .howto-tutorial-cell.tint-5 { background-color: color-mix(in srgb, #6B5B95 10%, var(--board-cell, var(--cell))); }
.howto-tutorial-suguru .howto-tutorial-cell.tint-6 { background-color: color-mix(in srgb, #E07A5F 10%, var(--board-cell, var(--cell))); }

.howto-tutorial-suguru .howto-tutorial-cell.wall-n { --suguru-wall-n: linear-gradient(var(--board-line-strong, var(--ink)), var(--board-line-strong, var(--ink))); }
.howto-tutorial-suguru .howto-tutorial-cell.wall-e { --suguru-wall-e: linear-gradient(var(--board-line-strong, var(--ink)), var(--board-line-strong, var(--ink))); }
.howto-tutorial-suguru .howto-tutorial-cell.wall-s { --suguru-wall-s: linear-gradient(var(--board-line-strong, var(--ink)), var(--board-line-strong, var(--ink))); }
.howto-tutorial-suguru .howto-tutorial-cell.wall-w { --suguru-wall-w: linear-gradient(var(--board-line-strong, var(--ink)), var(--board-line-strong, var(--ink))); }

.howto-tutorial-suguru .howto-tutorial-keypad {
  grid-template-columns: repeat(2, minmax(44px, 1fr));
}

.howto-tutorial-suguru .howto-tutorial-keypad button.ghost {
  grid-column: 1 / -1;
}

.howto-tutorial-shikaku .howto-tutorial-cell.is-highlight,
.howto-tutorial-suguru .howto-tutorial-cell.is-highlight {
  box-shadow: inset 0 0 0 3px color-mix(in srgb, var(--gold, var(--accent)) 75%, transparent);
}

.howto-tutorial-shikaku .howto-tutorial-cell.is-focus,
.howto-tutorial-suguru .howto-tutorial-cell.is-focus {
  box-shadow: none;
  outline: 2px solid var(--gold, var(--accent));
  outline-offset: -4px;
}

.howto-tutorial-shikaku .howto-tutorial-cell.is-selected,
.howto-tutorial-suguru .howto-tutorial-cell.is-selected {
  outline: none;
  box-shadow: inset 0 0 0 2.5px var(--play-ring-active, #19D65A);
  background-color: var(--board-cell-sel, var(--cell));
  z-index: 1;
}

.howto-tutorial-cell.is-constraint {
  outline: 2px dashed var(--accent);
  outline-offset: -6px;
}

.howto-tutorial-suguru .howto-tutorial-cell.is-conflict {
  color: var(--bad, #b42318);
  box-shadow: inset 0 -3px 0 0 var(--bad, #b42318);
}

.howto-tutorial-suguru .howto-tutorial-cell.is-selected.is-conflict {
  box-shadow:
    inset 0 0 0 2.5px var(--play-ring-active, #19D65A),
    inset 0 -3px 0 0 var(--bad, #b42318);
}

.howto-tutorial-shikaku .howto-tutorial-cell.is-drag,
.howto-tutorial-shikaku .howto-tutorial-cell.is-anchor {
  box-shadow: inset 0 0 0 2.5px var(--play-ring-active, #19D65A);
  background-color: var(--board-cell-sel, var(--cell));
}

.howto-tutorial-sky-grid,
.howto-tutorial-yakazu-grid {
  display: grid;
  width: min(100%, 320px);
  aspect-ratio: 1;
  gap: 0;
  border: 3px solid var(--grid-strong, #3a2d22);
  border-radius: 6px;
  background: var(--grid-strong, #3a2d22);
  box-shadow: var(--shadow, 0 8px 24px rgba(0, 0, 0, 0.08));
}

.howto-tutorial-sky-corner,
.howto-tutorial-sky-clue {
  display: grid;
  place-items: center;
  min-height: 44px;
  min-width: 44px;
  background: var(--paper, var(--bg, #fffaf2));
  color: var(--ink-strong, #241a14);
  font-weight: 800;
  font-variant-numeric: lining-nums tabular-nums;
  font-size: clamp(0.75rem, 3vw, 1rem);
}

.howto-tutorial-sky-clue.is-highlight {
  outline: 2px solid var(--gold, var(--accent));
  outline-offset: -3px;
  background: var(--gold-wash, color-mix(in srgb, var(--gold, var(--accent)) 18%, var(--paper, #fffaf2)));
}

.howto-tutorial-sky .howto-tutorial-cell,
.howto-tutorial-yakazu .howto-tutorial-cell {
  font-variant-numeric: lining-nums tabular-nums;
  background: var(--board-cell, var(--cell, #fffaf0));
  color: var(--board-entry, var(--entry, #1d4ed8));
}

.howto-tutorial-sky .howto-tutorial-cell.is-given,
.howto-tutorial-yakazu .howto-tutorial-cell.is-given {
  color: var(--board-given, var(--ink-strong, #241a14));
  font-weight: 800;
}

.howto-tutorial-sky .howto-tutorial-cell.is-selected,
.howto-tutorial-yakazu .howto-tutorial-cell.is-selected {
  outline: none;
  box-shadow: inset 0 0 0 2.5px var(--play-ring-active, #19D65A);
  background-color: var(--board-cell-sel, var(--cell));
  z-index: 1;
}

.howto-tutorial-sky .howto-tutorial-cell.is-conflict,
.howto-tutorial-yakazu .howto-tutorial-cell.is-conflict {
  box-shadow: inset 0 -3px 0 0 var(--bad, #b42318);
}

.howto-tutorial-sky .howto-tutorial-cell.is-selected.is-conflict,
.howto-tutorial-yakazu .howto-tutorial-cell.is-selected.is-conflict {
  box-shadow:
    inset 0 0 0 2.5px var(--play-ring-active, #19D65A),
    inset 0 -3px 0 0 var(--bad, #b42318);
}

.howto-tutorial-yakazu .howto-tutorial-cell.is-black {
  background: #241a14;
  cursor: default;
  box-shadow: none;
}

.howto-tutorial-sky .howto-tutorial-keypad button.ghost,
.howto-tutorial-yakazu .howto-tutorial-keypad button.ghost {
  grid-column: 1 / -1;
}