/* Button Component - BEM naming.
   One height scale (min-height tokens) so buttons in a row share a baseline,
   and every variant meets the 44px touch target on mobile. Size modifiers
   change height + horizontal padding only; never the vertical rhythm. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-height-md);
  padding: 0 var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: var(--font-size-base);
  line-height: 1.5;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

/* Button variants */
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-text-white);
}

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

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

.btn--secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-text-white);
  opacity: 0.9;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

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

.btn--warning {
  background-color: var(--color-warning);
  color: var(--color-text-white);
}

.btn--warning:hover {
  background-color: #d97706;
}

/* Button sizes — height tokens, horizontal padding scales with them */
.btn--small {
  min-height: var(--control-height-sm);
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn--large {
  min-height: var(--control-height-lg);
  padding: 0 var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn--full {
  width: 100%;
  text-align: center;
}

/* Touch devices: even the small variant must clear the 44px target. */
@media (max-width: 768px) {
  .btn--small {
    min-height: var(--touch-target-min);
  }
}

/* Legacy classes for backwards compatibility — kept in lockstep with the
   BEM variants above so old markup renders identically. */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-white);
}

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

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

.btn-secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-text-white);
  opacity: 0.9;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

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

.btn-warning {
  background-color: var(--color-warning);
  color: var(--color-text-white);
}

.btn-warning:hover {
  background-color: #d97706;
}

.btn-small {
  min-height: var(--control-height-sm);
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-large {
  min-height: var(--control-height-lg);
  padding: 0 var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-full {
  width: 100%;
  text-align: center;
}

.btn-block {
  width: 100%;
  text-align: center;
}

@media (max-width: 768px) {
  .btn-small {
    min-height: var(--touch-target-min);
  }
}