/* ═══════════════════════════════════════════════════════════════════
   PuzzleTime — style.css
   Two themes: "light" (Liquid Glass Light) and "dark" (Liquid Glass Dark).
   All color values live as CSS custom properties; never hardcoded inline.
═══════════════════════════════════════════════════════════════════ */

/* ─── Base layout / spacing / radii ────────────────────────────── */
:root {
  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --radius-xl:   26px;

  --space-xs:    6px;
  --space-sm:    12px;
  --space-md:    20px;
  --space-lg:    32px;
  --space-xl:    48px;

  --topbar-h:    52px;
  --actionbar-h: 66px;
}

/* ─── Font size variants ────────────────────────────────────────── */
[data-font-size="small"]  { --font-base: 14px; --cell-font: 16px; --tile-font: 20px; }
[data-font-size="medium"] { --font-base: 16px; --cell-font: 19px; --tile-font: 24px; }
[data-font-size="large"]  { --font-base: 18px; --cell-font: 23px; --tile-font: 30px; }

/* ─── Grid line weights ─────────────────────────────────────────── */
[data-grid-lines="thin"]   { --grid-line: 1px; --grid-thick: 2px; }
[data-grid-lines="normal"] { --grid-line: 1px; --grid-thick: 3px; }
[data-grid-lines="bold"]   { --grid-line: 2px; --grid-thick: 4px; }

/* ─── Animation speeds ──────────────────────────────────────────── */
[data-animation="reduced"] { --dur: 0.1s;  --dur-long: 0.15s; }
[data-animation="normal"]  { --dur: 0.28s; --dur-long: 0.42s; }
[data-animation="lively"]  { --dur: 0.4s;  --dur-long: 0.6s;  }

@media (prefers-reduced-motion: reduce) {
  html { --dur: 0.01s !important; --dur-long: 0.01s !important; }
}

/* ═══════════════════════════════════════════════════════════════════
   THEMES — exactly two
═══════════════════════════════════════════════════════════════════ */

/* ── Light: Liquid Glass ────────────────────────────────────────── */
[data-theme="light"] {
  --bg-primary:    #f2f2f7;
  --bg-secondary:  #ffffff;
  --bg-glass:      rgba(255,255,255,0.62);
  --glass-blur:    blur(20px);
  --glass-border:  rgba(255,255,255,0.82);
  --bg-sheet:      rgba(242,242,247,0.94);
  --text-primary:  #1c1c1e;
  --text-secondary:#6e6e73;
  --text-muted:    #aeaeb2;
  --accent:        #007aff;
  --accent-secondary: #5856d6;
  --accent-light:  rgba(0,122,255,0.1);
  --accent-glow:   rgba(0,122,255,0.25);
  --shadow:        rgba(0,0,0,0.08);
  --shadow-card:   0 4px 24px rgba(0,0,0,0.06), 0 1px 0 rgba(255,255,255,0.9) inset;
  --shadow-sheet:  0 -2px 30px rgba(0,0,0,0.08);
  --border-color:  rgba(0,0,0,0.06);
  --border-strong: rgba(0,0,0,0.12);
  --cell-bg:       rgba(255,255,255,0.7);
  --cell-border:   rgba(0,0,0,0.1);
  --grid-line-color: rgba(0,0,0,0.12);
  --cell-given-bg: rgba(0,122,255,0.07);
  --cell-selected: rgba(0,122,255,0.14);
  --cell-conflict: rgba(255,59,48,0.12);
  --cell-correct:  rgba(52,199,89,0.14);
  --success:       #34c759;
  --error:         #ff3b30;
  --warning:       #ff9f0a;
  --reveal-color:  #5856d6;
  --tile-green:    #4cd964;
  --tile-yellow:   #ffcc00;
  --tile-gray:     #c7c7cc;
  --tile-empty-bg: rgba(0,0,0,0.04);
  --kbd-bg:        rgba(0,0,0,0.06);
  --pill-bg:       rgba(0,122,255,0.1);
  --pill-active-bg:#007aff;
  --pill-active-fg:#ffffff;
}

/* ── Dark: Liquid Glass ─────────────────────────────────────────── */
[data-theme="dark"] {
  --bg-primary:    #000000;
  --bg-secondary:  #1c1c1e;
  --bg-glass:      rgba(28,28,30,0.72);
  --glass-blur:    blur(20px);
  --glass-border:  rgba(255,255,255,0.1);
  --bg-sheet:      rgba(28,28,30,0.95);
  --text-primary:  #ffffff;
  --text-secondary:#98989d;
  --text-muted:    #48484a;
  --accent:        #0a84ff;
  --accent-secondary: #5e5ce6;
  --accent-light:  rgba(10,132,255,0.14);
  --accent-glow:   rgba(10,132,255,0.3);
  --shadow:        rgba(0,0,0,0.4);
  --shadow-card:   0 4px 30px rgba(0,0,0,0.35), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-sheet:  0 -2px 40px rgba(0,0,0,0.5);
  --border-color:  rgba(255,255,255,0.06);
  --border-strong: rgba(255,255,255,0.12);
  --cell-bg:       rgba(44,44,46,0.8);
  --cell-border:   rgba(255,255,255,0.08);
  --grid-line-color: rgba(255,255,255,0.1);
  --cell-given-bg: rgba(10,132,255,0.12);
  --cell-selected: rgba(10,132,255,0.22);
  --cell-conflict: rgba(255,69,58,0.2);
  --cell-correct:  rgba(48,209,88,0.18);
  --success:       #30d158;
  --error:         #ff453a;
  --warning:       #ffd60a;
  --reveal-color:  #5e5ce6;
  --tile-green:    #30d158;
  --tile-yellow:   #ffd60a;
  --tile-gray:     #3a3a3c;
  --tile-empty-bg: rgba(255,255,255,0.06);
  --kbd-bg:        rgba(255,255,255,0.1);
  --pill-bg:       rgba(10,132,255,0.14);
  --pill-active-bg:#0a84ff;
  --pill-active-fg:#ffffff;
}

/* ═══════════════════════════════════════════════════════════════════
   RESET & BASE
═══════════════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  font-size: var(--font-base, 16px);
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  height: 100%;
}

body {
  height: 100%;
  overflow: hidden;
  position: relative;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:active { transform: scale(0.96); }

/* ═══════════════════════════════════════════════════════════════════
   SCREEN TRANSITIONS
   Home slides out LEFT; puzzle slides in from RIGHT.
   Reverse on back.
   Duration: 320ms  Easing: ease-out quart
═══════════════════════════════════════════════════════════════════ */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  /* No default transform — set per-screen below */
  transition:
    transform 320ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
    opacity   320ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.screen.active {
  opacity: 1;
  pointer-events: all;
  transform: translateX(0);
}

/* Per-screen default positions.
   NOTE: ID-selector specificity (1-0-0) beats the class-only .screen.active
   rule (0-2-0), so we must add explicit #id.active overrides below. */
#screen-home   { transform: translateX(0); }
#screen-puzzle { transform: translateX(100%); }

/* Active-state overrides — specificity (1-1-0) beats the defaults above */
#screen-home.active   { transform: translateX(0); }
#screen-puzzle.active { transform: translateX(0); }

/* Slide-out: same high specificity, defined after active so they win
   when both classes are present (never happens in practice, but safe) */
#screen-home.slide-out   { transform: translateX(-100%); }
#screen-puzzle.slide-out { transform: translateX(100%); }

/* ═══════════════════════════════════════════════════════════════════
   HOME SCREEN
═══════════════════════════════════════════════════════════════════ */
.home-bg {
  position: absolute;
  inset: 0;
  background: var(--bg-primary);
  z-index: 0;
  overflow: hidden;
}

/* Subtle coloured glow blobs — static, no animation */
.home-bg::before {
  content: '';
  position: absolute;
  width: 55vw; height: 55vw;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  opacity: 0.1;
  top: -10%; left: 15%;
  pointer-events: none;
}

.home-bg::after {
  content: '';
  position: absolute;
  width: 42vw; height: 42vw;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
  opacity: 0.08;
  bottom: 10%; right: 8%;
  pointer-events: none;
}

.home-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  padding-top: max(var(--space-md), env(safe-area-inset-top));
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.app-wordmark {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-wordmark-icon {
  color: var(--accent);
  font-size: 1.5rem;
  line-height: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.puzzle-cards {
  position: relative;
  z-index: 1;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-lg) calc(var(--space-lg) + env(safe-area-inset-bottom));
  overflow-y: auto;
  overflow-x: hidden;
  align-content: start;
}

/* ─── Puzzle Card — Liquid Glass ──────────────────────────────── */
.puzzle-card {
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-card);
  transition:
    transform 200ms ease-out,
    box-shadow 200ms ease-out;
  cursor: default;
}

.puzzle-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card), 0 12px 40px var(--shadow);
}

/* Override global button:active for cards */
.puzzle-card:active { transform: translateY(0); }

.card-icon {
  font-size: 2rem;
  line-height: 1;
  height: 44px;
  display: flex;
  align-items: center;
  color: var(--accent);
}

.card-icon svg { width: 40px; height: 40px; }

.card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.card-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
  font-weight: 500;
}

.card-difficulties {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.diff-pill {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--pill-bg);
  color: var(--accent);
  border: 1px solid var(--border-color);
  transition: background 150ms ease, color 150ms ease;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.diff-pill:active { transform: scale(0.93); }

.diff-pill:hover,
.diff-pill.selected {
  background: var(--pill-active-bg);
  color: var(--pill-active-fg);
}

.play-btn {
  margin-top: 4px;
  padding: 10px 18px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  border-radius: 100px;
  text-align: center;
  transition: filter 150ms ease, transform 120ms ease;
  letter-spacing: 0.2px;
}

.play-btn:hover  { filter: brightness(1.08); }
.play-btn:active { transform: scale(0.96); filter: brightness(0.95); }

/* ═══════════════════════════════════════════════════════════════════
   PUZZLE SCREEN — TOP BAR (glass)
═══════════════════════════════════════════════════════════════════ */
.puzzle-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-h);
  padding: 0 var(--space-sm);
  padding-top: env(safe-area-inset-top);
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
  z-index: 10;
}

.topbar-center {
  flex: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.15;
}

.puzzle-name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.puzzle-diff-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 2px;
}

.timer {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  min-width: 34px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.5px;
}

[data-timer="hide"] .timer { visibility: hidden; }

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background 150ms ease, color 150ms ease;
  flex-shrink: 0;
}

.icon-btn:hover  { background: var(--accent-light); color: var(--accent); }
.icon-btn:active { transform: scale(0.9); }

/* ═══════════════════════════════════════════════════════════════════
   PUZZLE AREA
═══════════════════════════════════════════════════════════════════ */
.puzzle-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-primary);
  gap: var(--space-md);
}

/* ─── ACTION BAR (glass) ─────────────────────────────────────── */
.action-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  padding-bottom: max(var(--space-sm), env(safe-area-inset-bottom));
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.pill-btn {
  padding: 9px 16px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2px;
  background: var(--pill-bg);
  color: var(--accent);
  border: 1px solid var(--border-color);
  transition: background 150ms ease, color 150ms ease;
}

.pill-btn:hover  { background: var(--pill-active-bg); color: var(--pill-active-fg); }
.pill-btn:active { transform: scale(0.95); }

/* ═══════════════════════════════════════════════════════════════════
   SUDOKU GRID — Rigid, no layout shift on input
═══════════════════════════════════════════════════════════════════ */
.sudoku-grid {
  /* Compute once; cells are fractions of this fixed size */
  --_sz: min(calc(100vw - 2 * var(--space-md) - 8px), 448px);
  width:  var(--_sz);
  height: var(--_sz);   /* explicit height = no reflow ever */
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows:    repeat(9, 1fr);
  border: var(--grid-thick, 3px) solid var(--text-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;     /* clips any child overflow */
  background: var(--grid-line-color);
  gap: var(--grid-line, 1px);
  flex-shrink: 0;
}

.sudoku-cell {
  background: var(--cell-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--cell-font, 19px);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  position: relative;
  /* Prevent content from ever driving cell dimensions */
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  transition: background 100ms ease;
  user-select: none;
  -webkit-user-select: none;
}

.sudoku-cell.box-right  { border-right:  var(--grid-thick,3px) solid var(--text-secondary); }
.sudoku-cell.box-bottom { border-bottom: var(--grid-thick,3px) solid var(--text-secondary); }

.sudoku-cell.given      { background: var(--cell-given-bg); font-weight: 700; }
.sudoku-cell.selected   { background: var(--cell-selected) !important; }
.sudoku-cell.highlighted{ background: var(--accent-light); }
.sudoku-cell.conflict   { background: var(--cell-conflict) !important; animation: shake 0.3s ease; }
.sudoku-cell.correct    { background: var(--cell-correct); }
.sudoku-cell.revealed   { color: var(--reveal-color); font-weight: 700; }

.sudoku-cell .pencil-marks {
  position: absolute;
  inset: 1px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows:    repeat(3, 1fr);
}

.pencil-mark {
  font-size: calc(var(--cell-font, 19px) * 0.32);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
}

/* ─── Number Pad (Sudoku / KenKen) ───────────────────────────── */
.num-pad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  width: min(calc(100vw - 2*var(--space-md)), 320px);
  flex-shrink: 0;
}

.num-pad-btn {
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  font-size: var(--cell-font, 19px);
  font-weight: 700;
  color: var(--text-primary);
  transition: background 100ms ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.num-pad-btn:hover  { background: var(--cell-selected); }
.num-pad-btn:active { transform: scale(0.88); }
.num-pad-btn.erase  { font-size: 1rem; color: var(--text-secondary); }
.num-pad-btn.pencil-toggle { font-size: 0.85rem; color: var(--text-secondary); }
.num-pad-btn.pencil-toggle.active { background: var(--accent-light); color: var(--accent); }

/* ═══════════════════════════════════════════════════════════════════
   KENKEN GRID — also rigid
═══════════════════════════════════════════════════════════════════ */
.kenken-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.kenken-grid {
  --_sz: min(calc(100vw - 2*var(--space-md) - 8px), 448px);
  width:  var(--_sz);
  height: var(--_sz);
  display: grid;
  border: var(--grid-thick, 3px) solid var(--text-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--grid-line-color);
  gap: var(--grid-line, 1px);
  flex-shrink: 0;
}

.kenken-cell {
  background: var(--cell-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--cell-font, 19px);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  transition: background 100ms ease;
  user-select: none;
}

.kenken-cage-label {
  position: absolute;
  top: 2px;
  left: 3px;
  font-size: calc(var(--cell-font, 19px) * 0.34);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  pointer-events: none;
  white-space: nowrap;
}

.kenken-cage-progress {
  position: absolute;
  bottom: 2px;
  right: 3px;
  font-size: calc(var(--cell-font, 19px) * 0.3);
  font-weight: 600;
  color: var(--text-muted);
  pointer-events: none;
}

/* User-entered value centred by flexbox */
.kenken-user-val {
  font-size: var(--cell-font, 19px);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1;
}

.kenken-cell.cage-top    { border-top:    var(--grid-thick,3px) solid var(--text-secondary); }
.kenken-cell.cage-right  { border-right:  var(--grid-thick,3px) solid var(--text-secondary); }
.kenken-cell.cage-bottom { border-bottom: var(--grid-thick,3px) solid var(--text-secondary); }
.kenken-cell.cage-left   { border-left:   var(--grid-thick,3px) solid var(--text-secondary); }

.kenken-cell.given     { background: var(--cell-given-bg); }
.kenken-cell.selected  { background: var(--cell-selected) !important; }
.kenken-cell.conflict  { background: var(--cell-conflict) !important; animation: shake 0.3s ease; }
.kenken-cell.revealed  { color: var(--reveal-color); }

.kenken-cell.revealed .kenken-user-val { color: var(--reveal-color); font-weight: 700; }

/* ═══════════════════════════════════════════════════════════════════
   STAR BATTLE GRID
═══════════════════════════════════════════════════════════════════ */
.starbattle-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.starbattle-legend {
  display: flex;
  gap: var(--space-md);
  font-size: 0.76rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-align: center;
  flex-wrap: wrap;
  justify-content: center;
}

.starbattle-grid {
  --_sz: min(calc(100vw - 2*var(--space-md) - 8px), 448px);
  width:  var(--_sz);
  height: var(--_sz);
  display: grid;
  border: var(--grid-thick, 3px) solid var(--text-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--grid-line-color);
  gap: var(--grid-line, 1px);
  flex-shrink: 0;
}

.sb-cell {
  background: var(--cell-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--cell-font, 19px) * 0.9);
  cursor: pointer;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  transition: background 100ms ease;
  user-select: none;
  position: relative;
}

.sb-cell.region-border-top    { border-top:    var(--grid-thick,3px) solid var(--text-secondary); }
.sb-cell.region-border-right  { border-right:  var(--grid-thick,3px) solid var(--text-secondary); }
.sb-cell.region-border-bottom { border-bottom: var(--grid-thick,3px) solid var(--text-secondary); }
.sb-cell.region-border-left   { border-left:   var(--grid-thick,3px) solid var(--text-secondary); }

.sb-cell.has-star  { color: var(--accent); }
.sb-cell.has-x     { color: var(--text-muted); font-size: 0.85em; }
.sb-cell.conflict  { background: var(--cell-conflict) !important; }
.sb-cell.correct   { background: var(--cell-correct); }

/* ═══════════════════════════════════════════════════════════════════
   WORDLE GRID
═══════════════════════════════════════════════════════════════════ */
.wordle-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
  max-width: 460px;
}

.wordle-board { display: flex; flex-direction: column; gap: 6px; }

.wordle-row { display: flex; gap: 6px; }

.wordle-tile {
  /* Fixed size — never driven by content */
  width:  clamp(42px, calc((100vw - 80px) / 7), 62px);
  height: clamp(42px, calc((100vw - 80px) / 7), 62px);
  flex-shrink: 0;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--tile-font, 24px);
  font-weight: 800;
  text-transform: uppercase;
  background: var(--tile-empty-bg);
  color: var(--text-primary);
  overflow: hidden;
  transition: border-color 100ms ease;
}

.wordle-tile.filled {
  border-color: var(--accent);
  animation: tile-pop 100ms ease;
}

@keyframes tile-pop { 0%,100%{transform:scale(1)} 50%{transform:scale(1.08)} }

/* 3D flip — snappy 280ms per tile */
.wordle-tile.flipping {
  animation: tile-flip 280ms ease forwards;
}

@keyframes tile-flip {
  0%   { transform: rotateX(0deg); }
  49%  { transform: rotateX(-90deg); }
  50%  { transform: rotateX(-90deg); }
  100% { transform: rotateX(0deg); }
}

.wordle-tile[data-state="green"]  {
  background: var(--tile-green);
  border-color: var(--tile-green);
  color: #fff;
}
.wordle-tile[data-state="yellow"] {
  background: var(--tile-yellow);
  border-color: var(--tile-yellow);
  color: #1c1c1e;
}
.wordle-tile[data-state="gray"]   {
  background: var(--tile-gray);
  border-color: var(--tile-gray);
  color: var(--text-secondary);
}

/* ─── Wordle Keyboard ─────────────────────────────────────────── */
.wordle-keyboard {
  display: flex;
  flex-direction: column;
  gap: 7px;
  width: 100%;
  max-width: 460px;
}

.kb-row {
  display: flex;
  justify-content: center;
  gap: 5px;
}

.kb-key {
  height: 52px;
  min-width: 34px;
  border-radius: var(--radius-sm);
  background: var(--kbd-bg);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
  flex: 1;
  max-width: 42px;
  transition: background 180ms ease, color 180ms ease;
  text-transform: uppercase;
  user-select: none;
}

.kb-key.wide { max-width: 64px; font-size: 0.7rem; }
.kb-key:active { transform: scale(0.93); }

.kb-key[data-state="green"]  { background: var(--tile-green);  color: #fff; }
.kb-key[data-state="yellow"] { background: var(--tile-yellow); color: #1c1c1e; }
.kb-key[data-state="gray"]   { background: var(--tile-gray);   color: var(--text-secondary); }

/* ═══════════════════════════════════════════════════════════════════
   SETTINGS SHEET  (iOS-style slide-up, glass treatment)
   Duration: 280ms  Easing: iOS sheet
═══════════════════════════════════════════════════════════════════ */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: transparent;
  z-index: 100;
  pointer-events: none;
  transition: background 280ms ease;
}

.settings-overlay.open {
  background: rgba(0,0,0,0.4);
  pointer-events: all;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.settings-sheet {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: var(--bg-sheet);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-bottom: none;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: var(--space-sm) var(--space-lg) calc(var(--space-lg) + env(safe-area-inset-bottom));
  transform: translateY(100%);
  transition: transform 280ms cubic-bezier(0.32, 0.72, 0, 1);
  box-shadow: var(--shadow-sheet);
  max-height: 86vh;
  overflow-y: auto;
}

.settings-overlay.open .settings-sheet { transform: translateY(0); }

.settings-handle {
  width: 34px; height: 4px;
  background: var(--border-strong);
  border-radius: 100px;
  margin: 0 auto var(--space-md);
}

.settings-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.3px;
}

.settings-section { margin-bottom: var(--space-lg); }

.settings-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-sm);
}

.option-group { display: flex; gap: 6px; }

.option-btn {
  flex: 1;
  padding: 10px 6px;
  border-radius: var(--radius-md);
  background: var(--cell-bg);
  border: 1.5px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 120ms ease, border-color 120ms ease;
  text-align: center;
}

.option-btn.active {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}
.option-btn:hover  { background: var(--accent-light); }
.option-btn:active { transform: scale(0.95); }

.settings-close-btn {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-lg);
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-top: var(--space-sm);
  transition: filter 120ms ease;
}

.settings-close-btn:hover  { filter: brightness(1.08); }
.settings-close-btn:active { transform: scale(0.97); }

/* ═══════════════════════════════════════════════════════════════════
   TOAST NOTIFICATIONS
   Slide in from top: 200ms. Fade out: 150ms.
═══════════════════════════════════════════════════════════════════ */
.toast-container {
  position: fixed;
  top: calc(var(--topbar-h) + var(--space-sm));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  z-index: 200;
  pointer-events: none;
}

.toast {
  padding: 11px 18px;
  border-radius: 100px;
  background: var(--bg-sheet);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 8px 24px var(--shadow);
  white-space: nowrap;
  max-width: calc(100vw - 40px);
  text-align: center;
  animation: toast-in 200ms ease-out forwards;
}

.toast.dismiss { animation: toast-out 150ms ease-in forwards; }

@keyframes toast-in  {
  from { transform: translateY(-120%); opacity: 0; }
  to   { transform: translateY(0);     opacity: 1; }
}
@keyframes toast-out {
  from { transform: translateY(0); opacity: 1; }
  to   { transform: translateY(-14px); opacity: 0; }
}

/* ═══════════════════════════════════════════════════════════════════
   CONFETTI CANVAS
═══════════════════════════════════════════════════════════════════ */
#confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 300;
  display: none;
}

/* ═══════════════════════════════════════════════════════════════════
   FLASH OVERLAY
═══════════════════════════════════════════════════════════════════ */
.flash-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 299;
  opacity: 0;
}

.flash-overlay.success { animation: flash-success 0.6s ease-out forwards; }
.flash-overlay.error   { animation: flash-error   0.45s ease-out forwards; }

@keyframes flash-success {
  0%  { background: rgba(52,199,89,0);    opacity: 0; }
  30% { background: rgba(52,199,89,0.32); opacity: 1; }
  100%{ background: rgba(52,199,89,0);    opacity: 0; }
}

@keyframes flash-error {
  0%,100%{ background: rgba(255,59,48,0);    opacity: 0; }
  40%    { background: rgba(255,59,48,0.22); opacity: 1; }
}

/* ═══════════════════════════════════════════════════════════════════
   SHARED ANIMATIONS
═══════════════════════════════════════════════════════════════════ */
@keyframes shake {
  0%,100%{ transform:translateX(0) }
  20%    { transform:translateX(-5px) }
  40%    { transform:translateX(5px) }
  60%    { transform:translateX(-4px) }
  80%    { transform:translateX(4px) }
}

/* ═══════════════════════════════════════════════════════════════════
   SCROLLBAR
═══════════════════════════════════════════════════════════════════ */
::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 100px; }

/* ═══════════════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════════════ */
@media (max-width: 500px) {
  .puzzle-cards {
    grid-template-columns: 1fr;
    padding: var(--space-sm) var(--space-md) var(--space-lg);
  }
  .home-header { padding: var(--space-sm) var(--space-md); }
  .action-bar  { gap: 4px; }
  .pill-btn    { padding: 8px 11px; font-size: 0.73rem; }
}

@media (min-width: 860px) {
  .puzzle-area { padding: var(--space-lg); }
  .sudoku-grid { --_sz: min(calc(100vh - 220px), 500px); }
  .kenken-grid { --_sz: min(calc(100vh - 220px), 500px); }
  .starbattle-grid { --_sz: min(calc(100vh - 220px), 500px); }
}

/* Prevent any horizontal overflow at any viewport */
.screen, .puzzle-area, .puzzle-cards { max-width: 100vw; }

/* ═══════════════════════════════════════════════════════════════════
   PRINT STYLES
═══════════════════════════════════════════════════════════════════ */
.print-header { display: none; }

@media print {
  html, body { overflow: visible !important; height: auto !important; }

  #screen-home, .puzzle-topbar, .action-bar,
  #settings-overlay, #toast-container, #confetti-canvas,
  .flash-overlay, .num-pad, .wordle-keyboard,
  .no-print { display: none !important; }

  #screen-puzzle {
    position: static !important;
    transform: none !important;
    opacity: 1 !important;
    pointer-events: all !important;
  }

  .puzzle-area {
    overflow: visible !important;
    padding: 0 !important;
    background: white !important;
  }

  .print-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-bottom: 16px;
    font-family: system-ui, sans-serif;
  }

  .print-header span:first-child {
    font-size: 1.3rem;
    font-weight: 800;
    color: #000;
  }

  .print-header span:last-child {
    font-size: 0.85rem;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 1px;
  }

  .sudoku-grid, .kenken-grid, .starbattle-grid {
    background: #ccc !important;
    border-color: #000 !important;
    width: 480px !important;
    height: 480px !important;
  }

  .sudoku-cell, .kenken-cell, .sb-cell {
    background: white !important;
    color: black !important;
  }

  .sudoku-cell.given { background: #f0f0f0 !important; }

  .sudoku-cell.box-right, .sudoku-cell.box-bottom,
  .kenken-cell.cage-top, .kenken-cell.cage-right,
  .kenken-cell.cage-bottom, .kenken-cell.cage-left,
  .sb-cell.region-border-top, .sb-cell.region-border-right,
  .sb-cell.region-border-bottom, .sb-cell.region-border-left {
    border-color: #000 !important;
  }

  .answer-key {
    page-break-before: always;
    display: block !important;
    padding: 20px 0;
  }

  .answer-key h2 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: #000;
  }
}

.answer-key { display: none; }