/* ── Color Blind ─────────────────────────────────────────────────────────── */

#canvas-wrap {
  background: #0c0c0c;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0;
}

.cb-hide { display: none !important; }

/* ── Screen wrapper ──────────────────────────────────────────────────────── */

.cb-screen {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  min-height: 100%;
}

/* ── Loading / Error ─────────────────────────────────────────────────────── */

.cb-loading-text,
.cb-error-text {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  color: rgba(148, 163, 184, 0.5);
  text-align: center;
  margin: auto;
}

.cb-error-text { color: rgba(185, 28, 28, 0.75); }

/* ── Game screen ─────────────────────────────────────────────────────────── */

#cb-game {
  justify-content: center;
  padding: 16px 20px 36px;
  gap: 20px;
}

/* ── HUD ─────────────────────────────────────────────────────────────────── */

.cb-hud {
  width: 100%;
  text-align: center;
  flex-shrink: 0;
}

.cb-level-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(148, 163, 184, 0.4);
}

/* ── Board ───────────────────────────────────────────────────────────────── */

.cb-board-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
}

.cb-board {
  display: grid;
  /* columns set via JS: style.gridTemplateColumns = 'repeat(N, 1fr)' */
  gap: 3px;
  width: min(320px, calc(100vw - 40px));
  /* No explicit height — aspect-ratio on cells makes each row square */
}

/* ── Cell ────────────────────────────────────────────────────────────────── */

.cb-cell {
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: box-shadow 0.08s ease;
  /* background-color set inline by JS */
}

.cb-cell:active {
  opacity: 0.82;
}

/* Selection highlight: white inset ring — completely neutral, no colour hint.
   Works on any mid-tone saturated cell (L 38–62%) without implying a hue. */
.cb-cell.cb-selected {
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.9),
              inset 0 0 0 5px rgba(0, 0, 0, 0.25);
}

/* ── Controls ────────────────────────────────────────────────────────────── */

.cb-controls {
  width: 100%;
  display: flex;
  justify-content: center;
  flex-shrink: 0;
}

.cb-submit-btn {
  width: min(320px, calc(100vw - 40px));
  background: #1e293b;
  border: 1px solid #334155;
  color: #e2e8f0;
  padding: 14px 0;
  border-radius: 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
  -webkit-tap-highlight-color: transparent;
}

.cb-submit-btn:not(:disabled):hover  { background: #253045; border-color: #4a5568; }
.cb-submit-btn:not(:disabled):active { background: #1a2535; }
.cb-submit-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ── Overlays (correct / incorrect) ─────────────────────────────────────── */

.cb-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(12, 12, 12, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 10;
  padding: 24px;
}

.cb-overlay-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 300px;
  text-align: center;
}

.cb-overlay-head {
  font-family: 'DM Sans', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.cb-overlay-head--correct { color: #4ade80; }
.cb-overlay-head--wrong   { color: #f87171; }

.cb-overlay-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  color: rgba(148, 163, 184, 0.7);
  margin-bottom: 8px;
}

/* ── Shared button ───────────────────────────────────────────────────────── */

.cb-btn-primary {
  width: 100%;
  background: #1e293b;
  border: 1px solid #334155;
  color: #f1f5f9;
  padding: 13px 0;
  border-radius: 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.12s;
  -webkit-tap-highlight-color: transparent;
}

.cb-btn-primary:hover  { background: #253045; }
.cb-btn-primary:active { background: #1a2535; }

.cb-btn-ghost {
  width: 100%;
  background: transparent;
  border: 1px solid #2d3f55;
  color: #64748b;
  padding: 12px 0;
  border-radius: 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s;
  -webkit-tap-highlight-color: transparent;
}

.cb-btn-ghost:hover  { border-color: #4a5568; color: #94a3b8; }
.cb-btn-ghost:active { background: #1e293b; }

/* ── Start screen ────────────────────────────────────────────────────────── */

#cb-start {
  justify-content: center;
  padding: 48px 24px;
}

.cb-start-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 300px;
  text-align: center;
}

.cb-start-title {
  font-family: 'DM Sans', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: #f1f5f9;
  letter-spacing: 0.01em;
  margin-bottom: 4px;
}

.cb-start-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  color: rgba(148, 163, 184, 0.5);
  margin-bottom: 20px;
}

.cb-start-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

/* ── Win screen ──────────────────────────────────────────────────────────── */

#cb-win {
  justify-content: center;
  padding: 48px 24px;
  gap: 8px;
  text-align: center;
}

.cb-win-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 300px;
}

.cb-win-headline {
  font-family: 'DM Sans', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: #f1f5f9;
  letter-spacing: 0.01em;
}

.cb-win-body {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  color: rgba(148, 163, 184, 0.5);
  margin-bottom: 16px;
  line-height: 1.5;
}