.otbt-risks-bingo {
  --rb-border: #e5e7eb;
  --rb-text: #111827;
  --rb-muted: #6b7280;
  --rb-green: #10b981;
  --rb-green-bg: #d1fae5;
  --rb-red: #ef4444;
  --rb-red-bg: #fee2e2;
  --rb-card-bg: #ffffff;
  --rb-yellow: #f59e0b;
  --rb-yellow-bg: #fef3c7;
  --rb-deepred: #b91c1c;
  --rb-deepred-bg: #fecaca;
  --rb-aspect-w: 10;
  --rb-aspect-h: 8;
}

.otbt-rb-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.otbt-rb-randomize {
  appearance: none;
  border: 1px solid var(--rb-border);
  background: #f9fafb;
  color: var(--rb-text);
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  cursor: pointer;
}
.otbt-rb-randomize:hover { background: #f3f4f6; }

.otbt-rb-hint {
  color: var(--rb-muted);
  font-size: 0.9rem;
}

.otbt-rb-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.5rem;
  grid-auto-rows: 1fr;
}

.otbt-rb-card {
  appearance: none;
  border: 1px solid var(--rb-yellow);
  background: var(--rb-yellow-bg);
  color: var(--rb-text);
  padding: 0.6rem;
  border-radius: 0.5rem;
  aspect-ratio: var(--rb-aspect-w) / var(--rb-aspect-h);
  box-sizing: border-box;
  cursor: pointer;
  text-align: center;
  font-weight: 600;
  font-size: clamp(0.6rem, 0.9vw, 0.8rem);
  line-height: 1.2;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  overflow: hidden;
}

.otbt-rb-card:hover { box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15) inset; }

.otbt-rb-card.is-green {
  background: var(--rb-green-bg);
  border-color: var(--rb-green);
  color: var(--rb-text);
}

.otbt-rb-card.is-red {
  background: var(--rb-red-bg);
  border-color: var(--rb-red);
  color: var(--rb-text);
}

.otbt-rb-card.is-deepred {
  background: var(--rb-deepred-bg);
  border-color: var(--rb-deepred);
  color: var(--rb-text);
}

.otbt-rb-emoji {
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.otbt-rb-text {
  padding: 0 0.25rem;
  font-size: 0.75em;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  line-clamp: 4;
  -webkit-box-orient: vertical;
  word-break: break-word;
  overflow-wrap: anywhere;
  hyphens: auto;
}

@media (max-width: 600px) {
  .otbt-rb-grid { gap: 0.35rem; }
  .otbt-rb-card { font-size: clamp(0.45rem, 1.4vw, 0.6rem); padding: 0.4rem; }
  .otbt-rb-emoji { font-size: clamp(0.6rem, 2.0vw, 0.8rem); }
  .otbt-rb-text { font-size: 0.3em; -webkit-line-clamp: 2; line-clamp: 2; }
}

.otbt-rb-footer {
  margin-top: 0.5rem;
  text-align: right;
  color: var(--rb-muted);
  font-size: 0.75rem;
}