.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}
.topic-selector {
  width: 100%;
  max-width: 350px;
}
.topic-dropdown {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0 40px 0 var(--space-lg);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  height: 48px;
  width: 100%;
  appearance: none;
  font-family: var(--font-family);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23334155' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 20px center;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}
@media (hover: hover) and (pointer: fine) {
  .topic-dropdown:hover {
    background: var(--color-hover-bg);
    box-shadow: var(--shadow-md);
  }
}
.topic-dropdown:focus {
  outline: none;
  background: var(--color-hover-bg);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.button-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}