.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--control-height-md);
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition:
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    filter var(--duration-fast) var(--ease-out);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-on);
}

.btn--primary:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn--secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--color-surface-soft);
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-text);
}

.btn--ghost:hover:not(:disabled) {
  background: var(--hover-bg);
}

.btn--danger {
  background: var(--color-danger);
  color: var(--color-surface);
}

.btn--danger:hover:not(:disabled) {
  filter: brightness(1.08);
}

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

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}