/* ===========================================================================
   Brain Games — styles.css
   Warm dark theme, amber accent. Mobile-first. Operate mode.
   =========================================================================== */

/* -------- Design tokens --------------------------------------------------- */
:root {
  /* Neutral deep dark surfaces — Apple systemBackground.dark */
  --bg:            oklch(0.145 0.004 270);
  --bg-elevated:   oklch(0.185 0.004 270);
  --bg-raised:     oklch(0.235 0.004 270);
  --bg-input:      oklch(0.165 0.004 270);

  /* Hairline separators */
  --border:        oklch(1 0 0 / 0.10);
  --border-strong: oklch(1 0 0 / 0.14);
  --border-focus:  oklch(0.78 0.17 70 / 0.55);

  /* Text — Apple label ladder (neutral) */
  --fg:            oklch(1 0 0);
  --fg-muted:      oklch(1 0 0 / 0.60);
  --fg-dim:        oklch(1 0 0 / 0.45);
  --fg-on-accent:  oklch(0.18 0.025 70);

  /* Accent ≈ Apple systemOrange */
  --accent:        oklch(0.780 0.170 70);
  --accent-hover:  oklch(0.820 0.175 70);
  --accent-press:  oklch(0.720 0.160 70);
  --accent-soft:   oklch(0.780 0.170 70 / 0.16);
  --accent-ring:   oklch(0.780 0.170 70 / 0.45);

  /* Per-game icon tints — Apple per-app convention */
  --tint-spatial:  oklch(0.62 0.21 280);
  --tint-copycat:  oklch(0.76 0.19 144);
  --tint-calc:     oklch(0.78 0.17 70);
  --tint-reaction: oklch(0.66 0.23 25);
  --tint-stroop:   oklch(0.72 0.13 195);
  --tint-memory:   oklch(0.78 0.16 130);
  --tint-nback:    oklch(0.70 0.15 240);
  --tint-trail:    oklch(0.68 0.18 335);
  --tint-fly:      oklch(0.78 0.16 95);

  /* Semantic (warm-leaning, no blue) */
  --success:       oklch(0.780 0.150 150);
  --success-soft:  oklch(0.780 0.150 150 / 0.16);
  --danger:        oklch(0.685 0.190 25);
  --danger-soft:   oklch(0.685 0.190 25 / 0.16);
  --warning:       oklch(0.820 0.150 85);

  /* Concentric radii — outer = inner + padding */
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;
  --r-pill: 999px;

  /* Elevation — layered shadows, never paired with a border */
  --shadow-1: 0 1px 2px oklch(0 0 0 / 0.30);
  --shadow-2: 0 4px 12px oklch(0 0 0 / 0.32), 0 1px 3px oklch(0 0 0 / 0.25);
  --shadow-3: 0 12px 32px oklch(0 0 0 / 0.40), 0 4px 8px oklch(0 0 0 / 0.28);

  /* Motion — canonical curves, one per role */
  --ease-out:    cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-drawer: cubic-bezier(0.32, 0.72, 0, 1);
  --dur-press:   140ms;
  --dur-fast:    180ms;
  --dur-base:    240ms;
  --dur-slow:    360ms;

  /* Spacing scale (4px base) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;

  /* Layout — content max-widths at each breakpoint role */
  --content-narrow: 480px;   /* focused game stages, calculation */
  --content-normal: 720px;   /* default content width */
  --content-wide: 1040px;    /* home grid canvas */
  --tap: 44px;

  /* Safe areas */
  --safe-top:    env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left:   env(safe-area-inset-left, 0px);
  --safe-right:  env(safe-area-inset-right, 0px);

  color-scheme: dark;
}

/* -------- Reset ----------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue",
    "Inter", "Roboto", "Noto Sans Bengali", "Hind Siliguri", "Nirmala UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  overscroll-behavior: none;
}

html[lang="bn"] .app-bar__title,
html[lang="bn"] .home-title {
  letter-spacing: 0;
}

html[lang="bn"] * { letter-spacing: 0; }
html[lang="bn"] .home-title { line-height: 1.25; }

body {
  overflow: hidden;
}

button, input { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }
svg { display: block; }

::selection { background: var(--accent-soft); color: var(--fg); }

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

/* -------- App shell ------------------------------------------------------- */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  width: 100%;
  background: var(--bg);
  position: relative;
  padding-top: var(--safe-top);
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
}

.app-bar {
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: var(--tap) 1fr var(--tap);
  align-items: center;
  gap: var(--s-2);
  height: 56px;
  padding: 0 var(--s-3);
  padding-bottom: 0;
  background: oklch(0.145 0.004 270 / 0.85);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 5;
}

.app-bar[hidden] { display: none; }

.app-bar__title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-align: center;
  text-wrap: balance;
}

.app-bar__right { display: flex; justify-content: flex-end; }

.view-host {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  position: relative;
}

/* -------- Icon button ----------------------------------------------------- */
.icon-btn {
  width: var(--tap);
  height: var(--tap);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--fg);
  border-radius: var(--r-md);
  transition: transform var(--dur-press) var(--ease-out),
              background-color var(--dur-press) var(--ease-out),
              color var(--dur-press) var(--ease-out);
}
.icon-btn:hover { background: var(--bg-raised); }
.icon-btn:active { transform: scale(0.94); background: var(--bg-raised); }
.icon-btn[hidden] { display: none !important; }

/* -------- Views (router) -------------------------------------------------- */
.view {
  padding: var(--s-5) var(--s-4);
  padding-bottom: calc(var(--s-7) + var(--safe-bottom));
  display: flex;
  flex-direction: column;
  gap: var(--s-5);
  min-height: 100%;
  width: 100%;
  max-width: var(--content-normal);
  margin: 0 auto;
  animation: view-enter var(--dur-base) var(--ease-out) both;
}
.view--home { max-width: var(--content-wide); }
.view--game { max-width: var(--content-narrow); }

@keyframes view-enter {
  from { opacity: 0; transform: translateY(8px) scale(0.985); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .view { animation: view-enter-reduced var(--dur-fast) var(--ease-out) both; }
  @keyframes view-enter-reduced { from { opacity: 0; } to { opacity: 1; } }
}

/* -------- Home ----------------------------------------------------------- */
.home-top {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}

.home-head {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding: var(--s-3) var(--s-1) 0;
}

.home-head__row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s-3);
  flex-wrap: wrap;
}

.home-head__row .home-title { flex: 1 1 auto; }

.home-head__tools {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--s-1);
}
.home-head__tools .icon-btn { color: var(--fg-muted); }
.home-head__tools .icon-btn:hover,
.home-head__tools .icon-btn:active { color: var(--fg); }

/* Language toggle — quiet pill, no decoration */
.lang-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg-elevated);
}

.lang-toggle__opt {
  min-height: var(--tap);
  padding: 0 var(--s-3);
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1;
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.lang-toggle__opt:first-child { border-radius: var(--r-pill) 0 0 var(--r-pill); }
.lang-toggle__opt:last-child { border-radius: 0 var(--r-pill) var(--r-pill) 0; }
.lang-toggle__opt + .lang-toggle__opt { border-left: 1px solid var(--border); }

.lang-toggle__opt:hover { color: var(--fg); }

.lang-toggle__opt.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}

.home-title {
  font-size: 2.125rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.07;
  text-wrap: balance;
}

.home-subtitle {
  color: var(--fg-muted);
  font-size: 0.9375rem;
  line-height: 1.45;
  max-width: 52ch;
  text-wrap: pretty;
}

/* Inline stats — metadata of the headline, not a card */
.home-stats {
  display: flex;
  align-items: baseline;
  padding: var(--s-3) var(--s-1) var(--s-1);
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 0 var(--s-4);
}
.stat:first-child { padding-left: 0; }
.stat + .stat { border-left: 1px solid var(--border); }
.stat__value {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat__label {
  font-size: 0.75rem;
  color: var(--fg-dim);
}
.stat--accent .stat__value { color: var(--accent); }

/* -------- Game list (home) ----------------------------------------------- */
.game-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

.game-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-4);
  background: var(--bg-elevated);
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  text-align: left;
  color: var(--fg);
  transition: transform var(--dur-press) var(--ease-out),
              background-color var(--dur-press) var(--ease-out);
}
.game-card:hover { background: var(--bg-raised); }
.game-card:active { transform: scale(0.98); }

/* Per-game tint (Apple per-app icon convention) */
.game-card[data-tint="spatial"]  { --tint: var(--tint-spatial); }
.game-card[data-tint="copycat"]  { --tint: var(--tint-copycat); }
.game-card[data-tint="calc"]     { --tint: var(--tint-calc); }
.game-card[data-tint="reaction"] { --tint: var(--tint-reaction); }
.game-card[data-tint="stroop"]   { --tint: var(--tint-stroop); }
.game-card[data-tint="memory"]   { --tint: var(--tint-memory); }
.game-card[data-tint="nback"]    { --tint: var(--tint-nback); }
.game-card[data-tint="trail"]    { --tint: var(--tint-trail); }
.game-card[data-tint="fly"]      { --tint: var(--tint-fly); }

.game-card__icon {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in oklch, var(--tint, var(--accent)) 22%, transparent);
  color: var(--tint, var(--accent));
  border-radius: 10px;
}
.game-card__icon svg { width: 22px; height: 22px; }

.game-card__body { flex: 1 1 auto; min-width: 0; }
.game-card__name {
  display: block;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-wrap: balance;
  color: var(--fg);
}
.game-card__desc {
  display: block;
  font-size: 0.8125rem;
  color: var(--fg-muted);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Bengali glyphs are wider — let the description wrap (clamped) instead of truncating mid-word */
html[lang="bn"] .game-card__desc {
  white-space: normal;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-height: 1.3;
}

.game-card__best {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
  text-align: right;
}
.game-card__best-num {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent);
}
.game-card__trophy { display: inline-flex; }
.game-card__trophy svg { width: 12px; height: 12px; }
.game-card__best-num strong {
  color: var(--accent);
  font-size: 0.9375rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.game-card__best-label {
  font-size: 0.6875rem;
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}

.game-card__chevron {
  flex: 0 0 auto;
  color: var(--fg-dim);
  display: inline-flex;
}
.game-card__chevron svg { width: 16px; height: 16px; }

/* -------- Buttons -------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: var(--tap);
  padding: 0 var(--s-5);
  border-radius: var(--r-md);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  text-align: center;
  transition: transform var(--dur-press) var(--ease-out),
              background-color var(--dur-press) var(--ease-out),
              color var(--dur-press) var(--ease-out),
              border-color var(--dur-press) var(--ease-out);
}
.btn:active { transform: scale(0.97); }
.btn[disabled] { opacity: 0.5; pointer-events: none; }

.btn--primary {
  background: var(--accent);
  color: var(--fg-on-accent);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { background: var(--accent-hover); }

.btn--ghost {
  background: var(--bg-elevated);
  color: var(--fg);
  border: 1px solid var(--border-strong);
}
.btn--ghost:hover { background: var(--bg-raised); }

.btn--block { width: 100%; }

/* -------- Game screen common --------------------------------------------- */
.game-screen {
  display: flex;
  flex-direction: column;
  gap: var(--s-5);
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}

.score-pill {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s-2);
  padding: var(--s-2) var(--s-3);
  background: var(--bg-elevated);
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
}
.score-pill__label {
  font-size: 0.6875rem;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.score-pill__value {
  font-size: 1.0625rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* Stage: where the actual gameplay lives */
.stage {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-5);
  text-align: center;
  padding: var(--s-4) 0;
  min-height: 380px;
}

.stage__hint {
  font-size: 0.875rem;
  color: var(--fg-muted);
  text-wrap: pretty;
  max-width: 28ch;
}

/* Overlay (start / end states) */
.overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-4);
  text-align: center;
  padding: var(--s-6) var(--s-4);
  animation: view-enter var(--dur-base) var(--ease-out) both;
}
.overlay__title {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  text-wrap: balance;
}
.overlay__text {
  color: var(--fg-muted);
  max-width: 32ch;
  text-wrap: pretty;
  font-size: 0.9375rem;
}
.overlay__result {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
  margin: var(--s-3) 0;
}
.overlay__result-value {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.overlay__result-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
}
.overlay__actions {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  width: 100%;
  margin-top: var(--s-2);
}

/* Best-score badge */
.best-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  font-size: 0.75rem;
  color: var(--fg-muted);
  padding: var(--s-1) var(--s-2);
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--r-pill);
  font-weight: 600;
}
.best-badge svg { width: 12px; height: 12px; }

/* -------- Share sheet (QR modal) ------------------------------------------ */
.share-sheet {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--s-5);
  background: oklch(0 0 0 / 0.55);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  animation: share-fade var(--dur-fast) var(--ease-out) both;
}
@keyframes share-fade { from { opacity: 0; } to { opacity: 1; } }

.share-sheet__card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-4);
  width: min(100%, 340px);
  padding: var(--s-6) var(--s-5) var(--s-5);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-3);
  animation: view-enter var(--dur-base) var(--ease-out) both;
}

.share-sheet__close {
  position: absolute;
  top: var(--s-2);
  right: var(--s-2);
  color: var(--fg-muted);
}
.share-sheet__close:hover,
.share-sheet__close:active { color: var(--fg); }

.share-sheet__title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

/* QR needs a light surface to scan reliably */
.share-sheet__qr {
  width: 208px;
  height: 208px;
  padding: var(--s-3);
  background: #ffffff;
  border-radius: var(--r-lg);
}
.share-sheet__qr svg { width: 100%; height: 100%; }

.share-sheet__hint {
  font-size: 0.875rem;
  color: var(--fg-muted);
  text-align: center;
  text-wrap: pretty;
}

.share-sheet__url {
  max-width: 100%;
  padding: var(--s-2) var(--s-3);
  background: var(--bg-raised);
  border-radius: var(--r-sm);
  font-size: 0.75rem;
  color: var(--fg-dim);
  text-align: center;
  overflow-wrap: anywhere;
  user-select: all;
  -webkit-user-select: all;
}

.share-sheet__actions {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  width: 100%;
}

/* -------- Toast ---------------------------------------------------------- */
.toast-host {
  position: fixed;
  left: 50%;
  bottom: calc(var(--s-7) + var(--safe-bottom));
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  pointer-events: none;
  z-index: 50;
  width: max-content;
  max-width: calc(100% - var(--s-6));
}
.toast {
  background: var(--bg-raised);
  color: var(--fg);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md);
  border: 1px solid var(--border-strong);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-2);
  animation: toast-in var(--dur-base) var(--ease-out) both;
}
.toast--success { border-color: oklch(0.780 0.150 150 / 0.35); }
.toast--danger  { border-color: oklch(0.685 0.190 25 / 0.35); }
.toast.leaving  { animation: toast-out var(--dur-base) var(--ease-in-out) both; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toast-out {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to   { opacity: 0; transform: translateY(8px) scale(0.97); }
}

/* =========================================================================
   GAME: Spatial Rotation
   ========================================================================= */
.spatial-ref {
  width: clamp(120px, 32vw, 168px);
  height: clamp(120px, 32vw, 168px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  padding: var(--s-3);
}
.spatial-ref svg {
  width: 100%;
  height: 100%;
  color: var(--accent);
}
.spatial-ref__spin {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-origin: 50% 50%;
}
.spatial-ref__spin.is-spinning {
  animation: spatial-ref-spin 1200ms var(--ease-in-out);
  will-change: transform;
}
.spatial-ref.is-entering,
.spatial-opt.is-entering {
  animation: spatial-in 220ms var(--ease-out) both;
}
.spatial-ref.is-leaving,
.spatial-opt.is-leaving {
  animation: spatial-out 180ms var(--ease-out) both;
}

.spatial-options {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-3);
}
.spatial-opt {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-3);
  transition:
    transform var(--dur-press) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out),
    border-color var(--dur-press) var(--ease-out),
    background-color var(--dur-press) var(--ease-out);
}
.spatial-opt:hover { background: var(--bg-raised); border-color: var(--border-strong); }
.spatial-opt:active { transform: scale(0.96); }
.spatial-opt svg { width: 100%; height: 100%; color: var(--fg); }

.spatial-opt--correct {
  border-color: var(--success);
  background: var(--success-soft);
}
.spatial-opt--correct svg { color: var(--success); }
.spatial-opt--dim { opacity: 0.35; }
.spatial-opt--wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
  animation: spatial-shake var(--dur-slow) var(--ease-in-out);
}

@keyframes spatial-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}
@keyframes spatial-in {
  from { opacity: 0; transform: scale(0.94); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes spatial-out {
  from { opacity: 1; transform: scale(1); }
  to   { opacity: 0; transform: scale(0.94); }
}
@keyframes spatial-ref-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.score-pill.is-pulsing { animation: spatial-pulse 220ms var(--ease-in-out); }
@keyframes spatial-pulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* =========================================================================
   GAME: Copycat (Simon-style pads)
   ========================================================================= */
.copycat-board {
  width: 100%;
  aspect-ratio: 1;
  max-width: 340px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: var(--s-3);
  padding: var(--s-3);
  background: var(--bg-elevated);
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
}

.copycat-stage {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
}

.pad {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  position: relative;
  background: color-mix(in oklch, var(--pad-color) 22%, var(--bg-raised));
  --pad-color: var(--fg);
  color: var(--pad-color);
  transition: transform var(--dur-press) var(--ease-out);
}
.pad[data-color="amber"] { --pad-color: oklch(0.70 0.155 70); }
.pad[data-color="green"] { --pad-color: oklch(0.68 0.140 150); }
.pad[data-color="coral"] { --pad-color: oklch(0.65 0.180 25); }
.pad[data-color="gold"]  { --pad-color: oklch(0.78 0.140 90); }

.pad::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--pad-color);
  box-shadow: 0 0 0 4px oklch(1 0 0 / 0.10) inset,
              0 12px 32px color-mix(in oklch, var(--pad-color) 55%, transparent);
  opacity: 0;
  transition: opacity 90ms var(--ease-out);
  will-change: opacity;
  pointer-events: none;
}
.pad:active { transform: scale(0.97); }
.pad.lit::before { opacity: 1; }
.pad.disabled { pointer-events: none; }

.copycat-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 8px;
}
.copycat-progress.is-counter {
  font-size: 0.8125rem;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.copycat-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--r-pill);
  background: var(--bg-raised);
  transform: scale(0.6);
  transition: transform 160ms var(--ease-out),
              background-color 160ms var(--ease-out);
}
.copycat-dot.is-filled {
  background: var(--accent);
  transform: scale(1);
}

.copycat-countdown {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: oklch(0.145 0.004 270 / 0.94);
  border-radius: var(--r-xl);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.copycat-countdown.is-active { opacity: 1; }
.copycat-countdown__round {
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-align: center;
  padding: 0 var(--s-3);
}
.copycat-countdown__digit {
  font-size: 3rem;
  font-weight: 800;
  color: var(--fg);
  letter-spacing: -0.04em;
  line-height: 1;
  animation: copycat-digit-in 350ms var(--ease-out) both;
}
@keyframes copycat-digit-in {
  from { opacity: 0; transform: scale(0.6); }
  to   { opacity: 1; transform: scale(1); }
}

.copycat-speed {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s-1);
  padding: var(--s-2) var(--s-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
}
.copycat-speed__label {
  font-size: 0.625rem;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.copycat-speed__value {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--fg-muted);
}
.copycat-speed--calm .copycat-speed__value       { color: var(--success); }
.copycat-speed--quick .copycat-speed__value      { color: var(--accent); }
.copycat-speed--fast .copycat-speed__value       { color: var(--warning); }
.copycat-speed--blistering .copycat-speed__value { color: var(--danger); }

.copycat-rating {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.copycat-status {
  font-size: 0.9375rem;
  color: var(--fg-muted);
  text-align: center;
  min-height: 1.5em;
}
.copycat-status strong { color: var(--fg); font-weight: 600; }

@media (max-width: 380px) {
  .copycat-speed { padding: var(--s-1) var(--s-2); }
  .copycat-speed__label { display: none; }
  .copycat-countdown__round { font-size: 1.375rem; }
  .copycat-countdown__digit { font-size: 2.5rem; }
}

/* =========================================================================
   GAME: Fly — mental spatial tracking
   ========================================================================= */
.fly-game { --tint: var(--tint-fly); }

.fly-cue {
  position: relative;
  min-height: 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-1);
}
.fly-cue::before {
  content: "";
  position: absolute;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in oklch, var(--tint) 15%, transparent), transparent 72%);
  pointer-events: none;
  z-index: 0;
}
.fly-cue__arrow {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--tint);
  opacity: 0;
  transform: scale(0.82);
  transition: opacity 130ms var(--ease-out), transform 130ms var(--ease-out);
}
.fly-cue__arrow.is-on { opacity: 1; transform: scale(1); }
.fly-cue__arrow svg { width: 3.25rem; height: 3.25rem; display: block; }
.fly-cue__count {
  position: relative;
  z-index: 1;
  font-size: 0.75rem;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  min-height: 1em;
}
.fly-cue__prompt {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
  opacity: 0;
  transform: scale(0.96);
  transition: opacity 180ms var(--ease-out), transform 180ms var(--ease-out);
}
.fly-cue__prompt.is-show { opacity: 1; transform: scale(1); }
.fly-status {
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.9rem;
  min-height: 1.4em;
}
.fly-status strong { color: var(--fg); font-weight: 600; }

.fly-board {
  width: 100%;
  max-width: 340px;
  align-self: center;
  aspect-ratio: 1;
  display: grid;
  gap: var(--s-2);
  padding: var(--s-2);
  background: var(--bg-elevated);
  border-radius: var(--r-xl);
}
.fly-tile {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: var(--bg-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--tint);
  min-height: 44px;
  transition: transform var(--dur-press) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.fly-tile:active { transform: scale(0.96); }
.fly-tile.disabled { pointer-events: none; }
.fly-tile.is-reveal {
  background: color-mix(in oklch, var(--tint) 20%, var(--bg-raised));
  border-color: color-mix(in oklch, var(--tint) 45%, transparent);
}
.fly-tile.is-correct,
.fly-tile.is-answer {
  background: var(--success-soft);
  border-color: color-mix(in oklch, var(--success) 55%, transparent);
  color: var(--success);
}
.fly-tile.is-wrong {
  background: var(--danger-soft);
  border-color: color-mix(in oklch, var(--danger) 55%, transparent);
}
.fly-token {
  display: flex;
  animation: fly-token-in 180ms var(--ease-out) both;
}
.fly-token svg { width: 26px; height: 26px; }
.fly-board[data-size="4"] .fly-token svg { width: 30px; height: 30px; }
.fly-board[data-size="3"] .fly-token svg { width: 38px; height: 38px; }
@keyframes fly-token-in {
  from { opacity: 0; transform: scale(0.7); }
  to   { opacity: 1; transform: scale(1); }
}
.fly-rating {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.fly-game.reduce-motion .fly-cue__arrow { transform: none; transition: opacity 100ms var(--ease-out); }
.fly-game.reduce-motion .fly-cue__prompt { transform: none; transition: opacity 120ms var(--ease-out); }
.fly-game.reduce-motion .fly-token { animation: none; }
.fly-game.reduce-motion .fly-tile:active { transform: none; }

/* =========================================================================
   GAME: Mental Calculation
   ========================================================================= */
.calc-header-left {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  min-width: 0;
}

/* Streak / combo badge */
.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  padding: var(--s-1) var(--s-2);
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  transform-origin: center left;
}
.streak-badge__icon { display: inline-flex; }
.streak-badge__icon svg { width: 12px; height: 12px; }
.streak-badge.streak-enter { animation: streak-pop var(--dur-fast) var(--ease-out); }
.streak-badge.streak-break { animation: streak-shake var(--dur-base) var(--ease-out); }
@keyframes streak-pop {
  0%   { transform: scale(0.85); opacity: 0.45; }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes streak-shake {
  0%   { transform: translateX(0); color: var(--accent); }
  25%  { transform: translateX(-3px); color: var(--danger); }
  50%  { transform: translateX(3px); color: var(--danger); }
  75%  { transform: translateX(-2px); color: var(--danger); }
  100% { transform: translateX(0); opacity: 0.35; }
}

/* Score pill hosts the floating +1 indicator (position:relative set inline in JS) */
.calc-float {
  position: absolute;
  left: 50%;
  bottom: 100%;
  margin-bottom: var(--s-1);
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px var(--s-1);
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--r-pill);
  font-size: 0.75rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  transform: translate(-50%, 0);
  animation: calc-float-up 600ms var(--ease-out) forwards;
}
.calc-float__bolt { display: inline-flex; }
.calc-float__bolt svg { width: 11px; height: 11px; }
@keyframes calc-float-up {
  0%   { opacity: 0; transform: translate(-50%, 8px); }
  20%  { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, -24px); }
}

/* Timer bar */
.calc-timer {
  width: 100%;
  height: 6px;
  background: var(--bg-elevated);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.calc-timer__bar {
  height: 100%;
  width: 100%;
  background: var(--accent);
  border-radius: var(--r-pill);
  transform-origin: left center;
  position: relative;
  transition: width 90ms linear, background-color var(--dur-base) var(--ease-out);
}
.calc-timer__bar.low { background: var(--warning); }
.calc-timer__bar.critical { background: var(--danger); }
.calc-timer__bar.paused { transition: none; }

.calc-timer__bar::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--success);
  opacity: 0;
  pointer-events: none;
}
.calc-timer__bar.flash-ok::after { background: var(--success); animation: calc-bar-flash 270ms var(--ease-out); }
.calc-timer__bar.flash-bad::after { background: var(--danger); animation: calc-bar-flash 270ms var(--ease-out); }
@keyframes calc-bar-flash {
  0%   { opacity: 0.9; }
  100% { opacity: 0; }
}

.calc-timer__bar.pulse { animation: calc-pulse 600ms var(--ease-in-out) infinite; }
@keyframes calc-pulse {
  0%, 100% { transform: scaleY(1); }
  50%      { transform: scaleY(1.4); }
}

@media (prefers-reduced-motion: reduce) {
  .calc-timer__bar.pulse,
  .calc-timer__bar.flash-ok::after,
  .calc-timer__bar.flash-bad::after { animation: none; }
  .streak-badge.streak-enter,
  .streak-badge.streak-break { animation: none; }
  .calc-float { animation: none; opacity: 0; }
}

/* Problem + options transition wrapper */
.calc-problem-wrap {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--s-5);
  width: 100%;
  transition: transform var(--dur-fast) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
}
.calc-problem-wrap.is-leaving {
  transform: translateY(-12px);
  opacity: 0;
  transition-duration: var(--dur-press);
}
.calc-problem-wrap.is-entering {
  transform: translateY(16px);
  opacity: 0;
  transition: none;
}
@media (prefers-reduced-motion: reduce) {
  .calc-problem-wrap,
  .calc-problem-wrap.is-leaving { transition: none; }
}

.calc-problem {
  font-size: 3.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  text-align: center;
  line-height: 1;
  text-wrap: balance;
  min-height: 1em;
}
.calc-op { font-weight: 700; }

.calc-options {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-3);
}
.calc-opt {
  position: relative;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  color: var(--fg);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  transition: transform var(--dur-press) var(--ease-out),
              background-color var(--dur-press) var(--ease-out),
              border-color var(--dur-press) var(--ease-out),
              color var(--dur-press) var(--ease-out);
}
.calc-opt:hover { background: var(--bg-raised); border-color: var(--border-strong); }
.calc-opt:active { transform: scale(0.96); }
.calc-opt--correct { border-color: var(--success); background: var(--success-soft); color: var(--success); }
.calc-opt--wrong { border-color: var(--danger); background: var(--danger-soft); color: var(--danger); }
.calc-opt[disabled] { pointer-events: none; }

.calc-opt__key {
  position: absolute;
  top: var(--s-1);
  right: var(--s-1);
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-raised);
  color: var(--fg-dim);
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  font-size: 0.6875rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  opacity: 0;
  transform: scale(1);
  transition: opacity var(--dur-fast) var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .calc-opt__key { opacity: 1; }
}

/* End-screen stats grid */
.calc-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-2);
  width: 100%;
  max-width: 360px;
  margin: var(--s-2) 0;
}
.calc-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--s-2) var(--s-1);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  text-align: center;
}
.calc-stat__value {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--fg);
}
.calc-stat__label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
}
.calc-qualitative {
  font-weight: 600;
  color: var(--accent);
}

/* Per-game responsive tuning */
@media (max-width: 600px) {
  .calc-problem { font-size: 2.625rem; }
  .calc-opt { min-height: 56px; font-size: 1.25rem; }
}
@media (min-width: 880px) {
  .calc-problem { font-size: 3.5rem; }
}

/* =========================================================================
   GAME: Reaction
   ========================================================================= */
.reaction-target {
  width: 100%;
  min-height: 360px;
  border-radius: var(--r-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-3);
  padding: var(--s-6) var(--s-5);
  text-align: center;
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  color: var(--fg);
  cursor: pointer;
  transition: transform var(--dur-press) var(--ease-out),
              background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out);
  user-select: none;
  -webkit-user-select: none;
}
.reaction-target:active { transform: scale(0.97); }
.reaction-target[data-state="idle"] {
  background: var(--bg-elevated);
}
.reaction-target[data-state="waiting"] {
  background: oklch(0.30 0.020 25);
  border-color: oklch(0.45 0.040 25);
  color: oklch(0.92 0.020 25);
}
.reaction-target[data-state="go"] {
  background: oklch(0.74 0.170 145);
  border-color: oklch(0.85 0.150 145);
  color: oklch(0.18 0.030 145);
  animation: reaction-go-pulse 200ms var(--ease-out);
}
.reaction-target[data-state="early"] {
  background: oklch(0.50 0.180 25);
  border-color: oklch(0.65 0.190 25);
  color: oklch(0.98 0.020 25);
}
.reaction-target[data-state="result"] {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
}
.reaction-target__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.reaction-target__hint {
  font-size: 0.9375rem;
  color: currentColor;
  opacity: 0.78;
  max-width: 24ch;
  text-wrap: pretty;
}
.reaction-target__result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-2);
  animation: reaction-result-in 220ms var(--ease-out);
}
.reaction-target__time {
  font-size: 4.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.reaction-target__time small {
  font-size: 1.25rem;
  font-weight: 600;
  opacity: 0.6;
  margin-left: 2px;
}
.reaction-target__rating {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.reaction-target__keycap {
  display: none;
  margin-top: var(--s-2);
  padding: 2px var(--s-2);
  border-radius: var(--r-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-raised);
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  box-shadow: 0 1px 0 var(--border-strong);
}

.reaction-attempts {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--s-2);
}
.reaction-attempt {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}
.reaction-attempt.done {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: transparent;
  animation: reaction-cell-in 200ms var(--ease-out);
}
.reaction-attempt.current::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 0 2px var(--accent-ring) inset;
  pointer-events: none;
  animation: reaction-ring-pulse 1.2s var(--ease-in-out) infinite;
}

.reaction-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-2);
  width: 100%;
  max-width: 360px;
  margin: var(--s-2) 0;
}
.reaction-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--s-2);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.reaction-stat__value {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}
.reaction-stat__label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-dim);
}

.reaction-chart {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}
.reaction-chart__bars {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
}
.reaction-bar {
  min-width: 64px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 var(--s-2);
  border-radius: var(--r-sm);
  background: var(--fg-muted);
  color: var(--bg);
  font-size: 0.75rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.reaction-bar--best { background: var(--accent); color: var(--fg-on-accent); }
.reaction-bar--worst { background: var(--fg-dim); color: var(--fg); }

.reaction-summary {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: var(--s-1);
}
.reaction-falsestarts {
  font-size: 0.8125rem;
  color: var(--fg-dim);
}

@media (min-width: 600px) {
  .reaction-target__time { font-size: 5rem; }
  .reaction-target__rating { font-size: 1.0625rem; }
  .reaction-stat__value { font-size: 1.5rem; }
  .reaction-bar { height: 32px; }
}

@media (hover: hover) and (pointer: fine) {
  .reaction-target__keycap { display: inline-block; }
}

@keyframes reaction-go-pulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.02); }
  100% { transform: scale(1); }
}
@keyframes reaction-result-in {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes reaction-cell-in {
  from { opacity: 0; transform: scale(0.7); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes reaction-ring-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

/* =========================================================================
   GAME: Stroop (inhibition — ink vs word)
   ========================================================================= */
.stroop-timer {
  width: 100%;
  height: 6px;
  background: var(--bg-elevated);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.stroop-timer__bar {
  height: 100%;
  width: 100%;
  background: var(--accent);
  border-radius: var(--r-pill);
  transform-origin: left center;
  transition: width 90ms linear, background-color var(--dur-base) var(--ease-out);
}
.stroop-timer__bar.low { background: var(--warning); }
.stroop-timer__bar.critical { background: var(--danger); }
/* Pulse only while the countdown is live — a frozen bar must not throb. */
.stroop-timer.is-running .stroop-timer__bar.critical {
  animation: stroop-timer-pulse 600ms var(--ease-in-out) infinite;
}
@keyframes stroop-timer-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.55; }
}

.stroop-ref { min-height: 96px; display: flex; align-items: center; justify-content: center; }
.stroop-stimulus {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  text-wrap: balance;
}
.stroop-options {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-3);
}
.stroop-options[data-count="3"] { grid-template-columns: repeat(3, 1fr); }
.stroop-options[data-count="4"] { grid-template-columns: repeat(2, 1fr); }
.stroop-options[data-count="6"] { grid-template-columns: repeat(3, 1fr); }
.stroop-swatch {
  min-height: var(--tap);
  padding: var(--s-2) var(--s-3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-1);
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: var(--r-lg);
  color: var(--fg);
  transition:
    transform var(--dur-press) var(--ease-out),
    border-color var(--dur-press) var(--ease-out),
    background-color var(--dur-press) var(--ease-out);
}
.stroop-swatch__dot {
  width: 26px; height: 26px;
  border-radius: var(--r-pill);
  box-shadow: 0 0 0 3px oklch(1 0 0 / 0.06) inset;
}
.stroop-swatch__label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.stroop-swatch.is-entering { animation: stroop-in 220ms var(--ease-out) both; }
.stroop-stimulus.is-entering { animation: stroop-in 220ms var(--ease-out) both; }
.stroop-stimulus.is-leaving,
.stroop-swatch.is-leaving { animation: stroop-out 180ms var(--ease-out) both; }
.stroop-swatch:hover { background: var(--bg-raised); border-color: var(--border-strong); }
.stroop-swatch:active { transform: scale(0.96); }
.stroop-swatch--correct {
  border-color: var(--success);
  background: var(--success-soft);
  animation: stroop-pop 260ms var(--ease-out);
}
.stroop-swatch--wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
  animation: stroop-shake var(--dur-slow) var(--ease-in-out);
}
.stroop-swatch--dim { opacity: 0.35; }
.stroop-swatch[data-color="white"] .stroop-swatch__label { color: var(--fg); }

@keyframes stroop-in {
  from { opacity: 0; transform: scale(0.94); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes stroop-out {
  from { opacity: 1; transform: scale(1); }
  to   { opacity: 0; transform: scale(0.94); }
}
@keyframes stroop-pop {
  0%   { transform: scale(1); }
  45%  { transform: scale(1.06); }
  100% { transform: scale(1); }
}
@keyframes stroop-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* =========================================================================
   GAME: Memory Match (visual working memory — flip pairs)
   ========================================================================= */
.memory-board {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(var(--cols, 2), 1fr);
  gap: var(--s-3);
  perspective: 800px;
}
.memory-tile {
  aspect-ratio: 1;
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 360ms var(--ease-out);
  -webkit-tap-highlight-color: transparent;
}
.memory-tile.is-flipped,
.memory-tile.is-matched { transform: rotateY(180deg); }
.memory-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-lg);
  border: 1.5px solid var(--border);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition:
    border-color var(--dur-press) var(--ease-out),
    background-color var(--dur-press) var(--ease-out);
}
.memory-face--front {
  background: var(--bg-elevated);
  color: var(--fg-dim);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.memory-tile:hover .memory-face--front { background: var(--bg-raised); border-color: var(--border-strong); }
.memory-tile:active .memory-face--front { transform: scale(0.96); }
.memory-face--back {
  background: var(--bg-raised);
  color: var(--fg);
  transform: rotateY(180deg);
  font-size: 1.75rem;
  line-height: 1;
}
.memory-tile.is-matched .memory-face--back {
  border-color: var(--success);
  background: var(--success-soft);
  color: var(--success);
}
.memory-tile.is-wrong .memory-face--back {
  border-color: var(--danger);
  background: var(--danger-soft);
  animation: memory-shake var(--dur-slow) var(--ease-in-out);
}
.memory-tile.is-entering { animation: memory-in 220ms var(--ease-out) both; }
@keyframes memory-in {
  from { opacity: 0; transform: scale(0.9) rotateY(0); }
  to   { opacity: 1; transform: scale(1) rotateY(0); }
}
/* Shake preserves rotateY(180deg) so the back face stays correctly oriented
   while trembling — avoids the brief front-face flash on a wrong pair. */
@keyframes memory-shake {
  0%, 100% { transform: rotateY(180deg) translateX(0); }
  20%      { transform: rotateY(180deg) translateX(-6px); }
  40%      { transform: rotateY(180deg) translateX(6px); }
  60%      { transform: rotateY(180deg) translateX(-4px); }
  80%      { transform: rotateY(180deg) translateX(4px); }
}

/* =========================================================================
   GAME: N-Back (working memory — match the n-previous symbol)
   ========================================================================= */
.nback-target {
  width: 100%;
  min-height: 340px;
  border-radius: var(--r-xl);
  border: 1.5px solid var(--border);
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-3);
  color: var(--fg);
  position: relative;
  overflow: hidden;
  transition:
    transform var(--dur-press) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    background-color var(--dur-base) var(--ease-out);
}
.nback-target:hover { border-color: var(--border-strong); }
.nback-target:active { transform: scale(0.99); }
.nback-target[data-state="hit"] {
  border-color: var(--success);
  background: var(--success-soft);
}
.nback-target[data-state="miss"] {
  border-color: var(--danger);
  background: var(--danger-soft);
}
.nback-symbol {
  font-size: 4.5rem;
  line-height: 1;
  color: var(--fg);
  animation: nback-symbol-in 300ms var(--ease-out) both;
}
.nback-target[data-state="hit"] .nback-symbol { color: var(--success); }
.nback-target[data-state="miss"] .nback-symbol { color: var(--danger); }
.nback-title { font-size: 1.0625rem; font-weight: 700; letter-spacing: -0.01em; }
.nback-hint { font-size: 0.875rem; color: var(--fg-muted); text-wrap: pretty; max-width: 24ch; }
.nback-progress {
  display: flex; align-items: center; gap: var(--s-2);
  font-size: 0.75rem; color: var(--fg-dim);
  text-transform: uppercase; letter-spacing: 0.08em;
}
.nback-progress__bar {
  width: 80px; height: 4px; border-radius: var(--r-pill);
  background: var(--bg-input); overflow: hidden;
}
.nback-progress__fill {
  height: 100%; width: 100%;
  background: var(--accent);
  transform-origin: left;
}
@keyframes nback-symbol-in {
  from { opacity: 0; transform: scale(0.86); }
  to   { opacity: 1; transform: scale(1); }
}
.nback-stepper {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: var(--s-1);
}
.nback-stepper__btn {
  width: 40px; height: 40px;
  border-radius: var(--r-pill);
  display: flex; align-items: center; justify-content: center;
  color: var(--fg);
  font-size: 1.25rem;
  font-weight: 700;
  transition: background-color var(--dur-press) var(--ease-out);
}
.nback-stepper__btn:hover { background: var(--bg-raised); }
.nback-stepper__btn:active { transform: scale(0.94); }
.nback-stepper__btn[disabled] { opacity: 0.35; pointer-events: none; }
.nback-stepper__value {
  min-width: 64px;
  text-align: center;
  font-size: 0.9375rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* =========================================================================
   GAME: Number Trail (processing speed — tap ascending)
   ========================================================================= */
.trail-grid {
  width: 100%;
  display: grid;
  gap: var(--s-2);
}
.trail-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  color: var(--fg);
  font-size: 1.125rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  transition:
    transform var(--dur-press) var(--ease-out),
    border-color var(--dur-press) var(--ease-out),
    background-color var(--dur-press) var(--ease-out),
    color var(--dur-press) var(--ease-out);
}
.trail-cell:hover { background: var(--bg-raised); border-color: var(--border-strong); }
.trail-cell:active { transform: scale(0.94); }
.trail-cell.is-done {
  border-color: var(--success);
  background: var(--success-soft);
  color: var(--success);
  animation: trail-pop 220ms var(--ease-out);
}
.trail-cell.is-wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
  color: var(--danger);
  animation: stroop-shake var(--dur-slow) var(--ease-in-out);
}
.trail-cell.is-entering { animation: trail-in 220ms var(--ease-out) both; }
.trail-timer {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--fg);
}
@keyframes trail-pop {
  0%   { transform: scale(0.9); }
  55%  { transform: scale(1.05); }
  100% { transform: scale(1); }
}
@keyframes trail-in {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}
.trail-splits {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-2);
  width: 100%;
  max-width: 360px;
}
.trail-split {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--s-2) var(--s-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.trail-split__label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
}
.trail-split__value {
  font-size: 1.0625rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* =========================================================================
   Utilities + reduced motion
   ========================================================================= */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.row { display: flex; gap: var(--s-2); align-items: center; }
.row--between { justify-content: space-between; }
.spacer { flex: 1 1 auto; }

/* =========================================================================
   Responsive — mobile-first base, expand gracefully at larger widths
   ========================================================================= */

/* Tablet / small desktop: more breathing room, larger type, bigger touch */
@media (min-width: 600px) {
  :root { --tap: 48px; }
  .app-bar { height: 64px; padding: 0 var(--s-5); }
  .view {
    padding: var(--s-6) var(--s-5);
    padding-bottom: calc(var(--s-8) + var(--safe-bottom));
    gap: var(--s-6);
  }
  .home-head { padding: var(--s-4) var(--s-1) 0; gap: var(--s-3); }
  .home-title { font-size: 2.625rem; }
  .home-subtitle { font-size: 1.0625rem; max-width: 56ch; }
  .stat__value { font-size: 1.5rem; }
  .stat__label { font-size: 0.75rem; }
  .game-card { padding: var(--s-4) var(--s-5); }
  .game-card__name { font-size: 1.0625rem; }
  .game-card__desc { font-size: 0.875rem; }
  .game-card__icon { width: 44px; height: 44px; }
  .game-card__icon svg { width: 24px; height: 24px; }
  .overlay__title { font-size: 2rem; }
  .overlay__result-value { font-size: 4rem; }
}

/* Desktop: larger stages, 2-column game grid. Hero stays single-column (Apple Large Title). */
@media (min-width: 880px) {
  body {
    background: oklch(0.11 0.004 270);
    background-image:
      radial-gradient(ellipse 80% 60% at 50% -10%, oklch(0.30 0.05 70 / 0.10), transparent 70%);
    background-attachment: fixed;
  }
  .app-bar { height: 68px; }
  .app-bar__title { font-size: 1.0625rem; }

  .home-head { padding: var(--s-5) var(--s-1) 0; }
  .home-title { font-size: 3.25rem; }
  .home-subtitle { font-size: 1.0625rem; max-width: 56ch; }
  .home-stats { padding: var(--s-4) var(--s-1) var(--s-2); }
  .stat__value { font-size: 1.75rem; }

  .game-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--s-3);
  }
  .game-card { padding: var(--s-4); }
  .game-card__icon { width: 48px; height: 48px; border-radius: 12px; }
  .game-card__icon svg { width: 26px; height: 26px; }
  .game-card__name { font-size: 1.125rem; }
  .game-card__desc { font-size: 0.875rem; }

  /* Game stages use the extra width */
  .stage { min-height: 440px; gap: var(--s-6); }
  .calc-problem { font-size: 4.5rem; }
  .calc-options { max-width: 560px; margin: 0 auto; }
  .calc-opt { min-height: 80px; font-size: 1.875rem; }
  .copycat-board { max-width: 420px; }
  .spatial-ref { width: 180px; height: 180px; }
  .spatial-options { max-width: 560px; margin: 0 auto; }
  .reaction-target { min-height: 440px; }
  .reaction-target__time { font-size: 5.5rem; }
  .stroop-stimulus { font-size: 4.5rem; }
  .stroop-options { max-width: 560px; margin: 0 auto; }
  .memory-board { max-width: 440px; }
  .nback-target { min-height: 440px; }
  .nback-symbol { font-size: 6rem; }
  .trail-grid { max-width: 520px; margin: 0 auto; }
  .trail-cell { font-size: 1.5rem; }
}

/* Large desktop: cap canvas, keep typography balanced */
@media (min-width: 1200px) {
  .home-title { font-size: 3.5rem; }
  .view--home { max-width: 1080px; }
}

/* Hover gating for touch — never fire hover styles on coarse pointers */
@media (hover: none), (pointer: coarse) {
  .game-card:hover,
  .icon-btn:hover,
  .btn--ghost:hover,
  .spatial-opt:hover,
  .calc-opt:hover,
  .stroop-swatch:hover,
  .memory-tile:hover,
  .trail-cell:hover,
  .nback-target:hover {
    background: inherit;
    border-color: inherit;
  }
  .game-card:hover { background: var(--bg-elevated); border-color: var(--border); }
  .btn--ghost:hover { background: var(--bg-elevated); }
  .icon-btn:hover { background: transparent; }
  .spatial-opt:hover { background: var(--bg-elevated); border-color: var(--border); }
  .calc-opt:hover { background: var(--bg-elevated); border-color: var(--border); }
  .stroop-swatch:hover { background: var(--bg-elevated); border-color: var(--border); }
  .memory-tile:hover { background: var(--bg-elevated); border-color: var(--border); }
  .trail-cell:hover { background: var(--bg-elevated); border-color: var(--border); }
  .nback-target:hover { background: var(--bg-elevated); border-color: var(--border); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}