/*
 * Button
 * Variants: primary, secondary, ghost, danger
 * Sizes: sm, md, lg
 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.btn-primary:active {
  background: var(--color-primary-active);
}

/* Secondary */
.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-border-hover);
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--color-surface);
}

/* Danger */
.btn-danger {
  background: var(--color-error);
  color: var(--color-text-inverse);
  border-color: var(--color-error);
}
.btn-danger:hover {
  background: var(--color-error-hover);
  border-color: var(--color-error-hover);
}

/* Sizes */
.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}
.btn-lg {
  padding: 0.625rem 1.25rem;
  font-size: var(--text-lg);
}

/* Icon-only */
.btn-icon {
  padding: 0.5rem;
  aspect-ratio: 1;
}
.btn-icon.btn-sm { padding: 0.25rem; }
.btn-icon.btn-lg { padding: 0.625rem; }

/* Full width */
.btn-block {
  width: 100%;
}