/* ========================================
   Buttons
   ======================================== */

/* Base button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
}

.btn:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.5);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Primary button */
.btn--primary {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn--primary:hover:not(:disabled) {
  opacity: 0.9;
  text-decoration: none;
}

.btn--primary:active:not(:disabled) {
  transform: translateY(1px);
  opacity: 0.95;
}

/* Secondary button */
.btn--secondary {
  background-color: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

.btn--secondary:hover:not(:disabled) {
  opacity: 0.9;
  text-decoration: none;
}

.btn--secondary:active:not(:disabled) {
  transform: translateY(1px);
  opacity: 0.95;
}

/* Ghost button (outline) */
.btn--ghost {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--ghost:hover:not(:disabled) {
  opacity: 0.8;
  text-decoration: none;
}

/* Danger button */
.btn--danger {
  background-color: var(--color-error);
  color: white;
  border-color: var(--color-error);
}

.btn--danger:hover:not(:disabled) {
  opacity: 0.9;
  text-decoration: none;
}

.btn--danger:active:not(:disabled) {
  transform: translateY(1px);
  opacity: 0.95;
}

/* Success button */
.btn--success {
  background-color: var(--color-success);
  color: white;
  border-color: var(--color-success);
}

.btn--success:hover:not(:disabled) {
  opacity: 0.9;
  text-decoration: none;
}

/* Link button */
.btn--link {
  background-color: transparent;
  color: var(--color-primary);
  border-color: transparent;
  padding: 0;
}

.btn--link:hover:not(:disabled) {
  opacity: 0.7;
  text-decoration: none;
}

/* Button sizes */
.btn--sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn--lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

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

/* Button group */
.btn-group {
  display: inline-flex;
  gap: var(--spacing-sm);
}

.btn-group--vertical {
  flex-direction: column;
}

/* Icon buttons */
.btn--icon {
  padding: var(--spacing-sm);
  width: 2.5rem;
  height: 2.5rem;
}

.btn--icon.btn--sm {
  width: 2rem;
  height: 2rem;
}

.btn--icon.btn--lg {
  width: 3rem;
  height: 3rem;
}