/* ============================================================
 * Samurai Sudoku — self-contained styles.
 * Defines its own brand variables so the page renders
 * correctly without sudoku.css or killer.css loaded.
 * ============================================================ */

/* ============================================================
 * 1. Custom properties
 * ============================================================ */
:root {
  --color-brand: #1D9E75;
  --color-brand-light: #9FE1CB;
  --color-brand-dark: #0F6E56;
  --color-given: #1a1a1a;
  --color-player: #1D9E75;
  --color-invalid: #E24B4A;
  --color-error-bg: #FDEDEC;
  --color-selected: #DBEAFE;
  --color-peer: #f0f9f6;
  --color-samurai-overlap: #EEF2FF;
  --color-border-light: #ccc;
  --color-border-dark: #333;
  --color-border-box: #888;
  --color-bg: #f8f8f6;
  --color-bg-secondary: #F5F5F5;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-text-secondary: #333;

  --radius-sm: 6px;
  --radius-md: 10px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;

  --transition-fast: 120ms ease-out;

  --touch-target: 44px;
  --focus-ring: 0 0 0 3px rgba(29, 158, 117, 0.45);

  /* Hint highlight colors */
  --color-hint-region:    rgba(29, 158, 117, 0.22);
  --color-hint-target:    #9FE1CB;
  --color-hint-technique: #FFF3CD;
  --color-hint-filled:    #1D9E75;
}

/* ============================================================
 * 2. Layout
 * ============================================================ */
.game-main {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  background: var(--color-bg);
  min-height: calc(100vh - 60px);
  box-sizing: border-box;
}

.game-title {
  font-size: 1.35rem;
  margin: 0;
  color: var(--color-text);
}

.game-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: 1rem;
  color: var(--color-text);
}

.game-meta__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.game-meta__timer {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 1.1rem;
}

/* Timer toggle (shared pattern) */
.game-meta__timer-group { position: relative; }
.timer-toggle {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px 6px;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.timer-toggle:hover { color: var(--color-text); background: var(--color-peer); }
.timer-toggle:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.timer-toggle-hide { display: none; }
.game-meta__timer-group.timer-hidden .timer-toggle-show { display: none; }
.game-meta__timer-group.timer-hidden .timer-toggle-hide { display: inline; }
.game-meta__timer-group.timer-hidden .game-meta__timer {
  color: transparent;
  user-select: none;
  position: relative;
}
.game-meta__timer-group.timer-hidden .game-meta__timer::after {
  content: '\2014\2009:\2009\2014';
  position: absolute;
  inset: 0;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-variant-numeric: tabular-nums;
}

.pencil-indicator {
  color: var(--color-text-muted);
  opacity: 0.35;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}
body.is-pencil-mode .pencil-indicator {
  opacity: 1;
  color: var(--color-brand-dark);
}

/* ============================================================
 * 3. Viewport + board
 * ============================================================ */
.samurai-viewport {
  width: 100%;
  aspect-ratio: 1;
  max-height: calc(100vh - 260px);
  overflow: hidden;
  position: relative;
  touch-action: none;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  cursor: grab;
}
.samurai-viewport:active { cursor: grabbing; }

.samurai-board {
  position: absolute;
  width: 924px;
  height: 924px;
  transform-origin: 0 0;
}

/* Cells are absolutely positioned inside the board. */
.samurai-cell {
  position: absolute;
  width: 44px;
  height: 44px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  border: 0.5px solid var(--color-border-light);
  background: var(--color-surface);
  color: var(--color-given);
  appearance: none;
  padding: 0;
  margin: 0;
  font-family: inherit;
}
.samurai-cell:focus {
  outline: none;
  box-shadow: inset 0 0 0 3px var(--color-brand);
  z-index: 3;
}

/* Overlap cells get a subtle tint so the cross pattern is obvious. */
.samurai-cell--overlap {
  background: var(--color-samurai-overlap);
}

/* Box borders — declared before grid borders so the thicker grid
   wins at shared edges. */
.samurai-cell--box-top    { border-top:    2px solid var(--color-border-box); }
.samurai-cell--box-bottom { border-bottom: 2px solid var(--color-border-box); }
.samurai-cell--box-left   { border-left:   2px solid var(--color-border-box); }
.samurai-cell--box-right  { border-right:  2px solid var(--color-border-box); }

/* Grid outer borders — thickest, declared last. */
.samurai-cell--grid-top    { border-top:    3px solid var(--color-border-dark); }
.samurai-cell--grid-bottom { border-bottom: 3px solid var(--color-border-dark); }
.samurai-cell--grid-left   { border-left:   3px solid var(--color-border-dark); }
.samurai-cell--grid-right  { border-right:  3px solid var(--color-border-dark); }

/* State classes */
.samurai-cell--player { color: var(--color-player); font-weight: 600; }
.samurai-cell--given  { font-weight: 700; color: var(--color-given); cursor: default; }
.samurai-cell--peer   { background-color: var(--color-peer); }
.samurai-cell--same   { color: var(--color-brand-dark); font-weight: 700; }
.samurai-cell--selected {
  background-color: var(--color-selected);
  outline: 2px solid var(--color-brand);
  outline-offset: -2px;
  z-index: 2;
}
.samurai-cell.samurai-cell--invalid {
  color: var(--color-invalid);
  background-color: var(--color-error-bg);
}

/* Cells digit + notes */
.samurai-cell__digit { line-height: 1; display: inline-block; }
.samurai-cell__notes {
  position: absolute;
  inset: 2px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  font-size: 10px;
  color: var(--color-text-muted);
  font-weight: 500;
}
.samurai-cell__note {
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.samurai-cell--player .samurai-cell__notes,
.samurai-cell--given  .samurai-cell__notes { display: none; }

/* Hint state classes — additive on top of base cell. */
.samurai-cell--hint-region {
  background-image: linear-gradient(
    var(--color-hint-region),
    var(--color-hint-region)
  );
}
.samurai-cell--hint-technique { background-color: var(--color-hint-technique); }
.samurai-cell--hint-target {
  background-color: var(--color-hint-target);
  box-shadow: inset 0 0 0 2px var(--color-brand);
}
.samurai-cell--hint-filled {
  background-color: var(--color-hint-filled);
  color: var(--color-surface);
  box-shadow: inset 0 0 0 2px var(--color-brand-dark);
}

/* Paused */
body.is-paused .samurai-cell__digit,
body.is-paused .samurai-cell__notes { visibility: hidden; }
body.is-paused .samurai-viewport::after {
  content: "Paused";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-brand-dark);
  background: var(--color-surface);
  pointer-events: none;
}

/* ============================================================
 * 4. Zoom controls — outside the viewport, never transformed.
 * ============================================================ */
.samurai-zoom-controls {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 0;
}

.samurai-zoom-btn {
  appearance: none;
  width: 44px;
  height: 44px;
  font-size: 18px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  color: var(--color-text);
}
.samurai-zoom-btn:hover { background: var(--color-bg-secondary); }
.samurai-zoom-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* ============================================================
 * 5. Number pad
 * ============================================================ */
.samurai-numpad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
}
.numpad-btn {
  appearance: none;
  min-height: var(--touch-target);
  min-width: var(--touch-target);
  padding: var(--space-md);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: background-color var(--transition-fast),
              transform var(--transition-fast);
}
.numpad-btn:hover { background: var(--color-peer); }
.numpad-btn:active {
  transform: scale(0.97);
  background: var(--color-brand-light);
}
.numpad-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.numpad-btn--clear {
  grid-column: span 5;
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-size: 1rem;
  font-weight: 500;
}

body.is-pencil-mode .numpad-btn {
  border-color: var(--color-brand);
  color: var(--color-brand-dark);
}

/* ============================================================
 * 6. Action buttons
 * ============================================================ */
.samurai-actions {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
  max-width: 560px;
  width: 100%;
  margin: 0 auto;
}

@media (max-width: 400px) {
  .samurai-actions { grid-template-columns: repeat(3, 1fr); }
}

.action-btn {
  appearance: none;
  min-height: var(--touch-target);
  padding: var(--space-sm) var(--space-sm);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: background-color var(--transition-fast),
              transform var(--transition-fast);
}

.action-btn i { pointer-events: none; }
.action-btn:hover { background: var(--color-peer); }
.action-btn:active { transform: scale(0.97); }
.action-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.action-btn--active {
  background: var(--color-brand);
  color: var(--color-surface);
  border-color: var(--color-brand-dark);
}
.action-btn--primary {
  background: var(--color-brand);
  color: var(--color-surface);
  border-color: var(--color-brand-dark);
}

.samurai-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* ============================================================
 * 7. Difficulty selector
 * ============================================================ */
.samurai-difficulty-selector {
  position: fixed;
  inset: 0;
  background: rgba(15, 30, 24, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  z-index: 10;
}
.samurai-difficulty-selector[hidden] { display: none; }

.samurai-difficulty-selector__panel {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  max-width: 420px;
  width: 100%;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.samurai-difficulty-selector__heading {
  margin: 0;
  font-size: 1.25rem;
  color: var(--color-brand-dark);
  text-align: center;
}

.samurai-difficulty-selector__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.difficulty-card {
  appearance: none;
  padding: var(--space-md);
  background: var(--color-bg);
  border: 2px solid var(--color-border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: inherit;
  min-height: 72px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: var(--space-xs);
  text-align: left;
  transition: border-color var(--transition-fast),
              transform var(--transition-fast),
              background-color var(--transition-fast);
}

.difficulty-card:hover {
  border-color: var(--color-brand);
  background: var(--color-peer);
}
.difficulty-card:active { transform: scale(0.98); }
.difficulty-card:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.difficulty-card__label {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
}
.difficulty-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.difficulty-card__cancel {
  appearance: none;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  min-height: var(--touch-target);
}
.difficulty-card__cancel:hover { background: var(--color-peer); }
.difficulty-card__cancel:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* ============================================================
 * 8. Completion overlay + loading
 * ============================================================ */
.samurai-completion {
  position: fixed;
  inset: 0;
  background: rgba(15, 110, 86, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  z-index: 9;
}
.samurai-completion[hidden] { display: none; }

.samurai-completion__inner {
  background: var(--color-surface);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  text-align: center;
  min-width: 260px;
  max-width: 380px;
  width: 100%;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  animation: popIn 240ms ease-out;
}
.samurai-completion__inner h2 {
  margin: 0 0 var(--space-sm);
  color: var(--color-brand-dark);
}
.samurai-completion__inner p {
  margin: 0 0 var(--space-md);
  font-size: 1.1rem;
  color: var(--color-text);
}

.samurai-loading,
.samurai-loading-skeleton {
  width: 100%;
  aspect-ratio: 1;
  max-height: calc(100vh - 260px);
  border-radius: var(--radius-md);
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 25%,
    #E8E8E8 50%,
    var(--color-bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: samurai-shimmer 1.5s infinite;
}
.samurai-loading[hidden],
.samurai-loading-skeleton[hidden] { display: none; }

@keyframes samurai-shimmer {
  0%   { background-position:  200% 0; }
  100% { background-position: -200% 0; }
}

/* Screen-reader only live region */
.samurai-status {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ============================================================
 * 9. Animations & a11y
 * ============================================================ */
@keyframes popIn {
  0%   { transform: scale(0.9); opacity: 0; }
  100% { transform: scale(1);   opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .samurai-board { transition: none !important; }
}

/* ============================================================
 * 10. Responsive
 * ============================================================ */
@media (min-width: 768px) {
  .game-main {
    max-width: 960px;
  }
  .samurai-viewport {
    max-height: calc(100vh - 300px);
  }
}

/* ============================================================
 * 11. High-contrast
 * ============================================================ */
@media (prefers-contrast: more) {
  .samurai-cell {
    border-color: #000;
  }
  .samurai-cell--box-top,
  .samurai-cell--box-bottom,
  .samurai-cell--box-left,
  .samurai-cell--box-right {
    border-color: #000;
  }
}