* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--tg-theme-bg-color, #ffffff);
  color: var(--tg-theme-text-color, #1a1a4d);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overscroll-behavior: none;
  user-select: none;
}

.screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.hidden { display: none !important; }

/* Loading spinner */
.spinner {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 4px solid var(--tg-theme-hint-color, #cccccc);
  border-top-color: var(--tg-theme-button-color, #2481cc);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.status-text, .error-text {
  text-align: center;
  font-size: 17px;
  line-height: 1.5;
  color: var(--tg-theme-hint-color, #707579);
  max-width: 320px;
}
.error-text { color: #e53935; }

/* Card grid: B I N G O header row + 5x5 cells */
.card-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  width: 100%;
  max-width: 420px;
}

.header-cell {
  text-align: center;
  font-weight: 700;
  font-size: 20px;
  padding: 8px 0;
  color: var(--tg-theme-button-color, #2481cc);
}

.cell {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(16px, 5vw, 22px);
  font-weight: 600;
  border-radius: 12px;
  background: var(--tg-theme-secondary-bg-color, #f0f0f3);
  color: var(--tg-theme-text-color, #1a1a4d);
  border: 2px solid transparent;
  transition: transform 0.08s ease, background 0.15s ease;
}

.cell.free {
  background: var(--tg-theme-button-color, #2481cc);
  color: var(--tg-theme-button-text-color, #ffffff);
}

.cell.marked {
  background: #4caf50;
  color: #ffffff;
}

.cell.tappable:active {
  transform: scale(0.93);
}

.cell.win {
  border-color: #ffd54f;
}

.won-banner {
  margin-top: 20px;
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  color: #4caf50;
}