.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

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

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

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

.btn--outline:hover {
  background: var(--color-secondary);
  color: var(--color-white);
}

.btn--text {
  background: transparent;
  color: var(--color-secondary);
  padding-inline: 0;
}

.btn--text:hover { color: var(--color-primary); }

.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--fs-xs); }
.btn--lg { padding: var(--space-4) var(--space-6); font-size: var(--fs-base); }
.btn--block { width: 100%; }

.btn--success { background: var(--color-success); color: var(--color-white); }
.btn--success:hover { filter: brightness(0.92); }

/* ---- Auth form loading state: real spinner, reassuring label ---- */
.btn.is-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  cursor: wait;
  opacity: 0.9;
}

.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  display: inline-block;
  animation: jdev-spin 0.7s linear infinite;
  flex-shrink: 0;
}

.btn.btn--outline .btn-spinner {
  border-color: rgba(25, 118, 210, 0.25);
  border-top-color: var(--color-secondary);
}

@keyframes jdev-spin {
  to { transform: rotate(360deg); }
}

.btn--danger {
  background: #DC2626;
  color: var(--color-white);
  border: none;
}
.btn--danger:hover { background: #B91C1C; }

.btn--white {
  background: var(--color-white);
  color: var(--color-secondary);
  border: none;
}
.btn--white:hover { background: rgba(255,255,255,0.9); }