/**
 * Button Component Styles
 * Unified button system for admin and public
 */

/* ===========================================
   BASE BUTTON
   =========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-5);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-user-select: none;
  user-select: none;
  letter-spacing: var(--letter-spacing-wide);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===========================================
   BUTTON VARIANTS
   =========================================== */

/* Primary Button - Solid dark */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(0);
}

/* Secondary Button - Outlined */
.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-border-dark);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

/* Accent Button - Terracotta */
.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

.btn-accent:hover:not(:disabled) {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-1px);
}

/* Ghost Button - Minimal */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-background-alt);
  color: var(--color-text);
}

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

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-error);
  color: var(--color-text-inverse);
}

/* Success Button */
.btn-success {
  background-color: var(--color-success);
  color: var(--color-text-inverse);
  border-color: var(--color-success);
}

.btn-success:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ===========================================
   BUTTON SIZES
   =========================================== */

.btn-xs {
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
}

.btn-sm {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-6);
  font-size: var(--font-size-base);
}

.btn-xl {
  padding: var(--spacing-5) var(--spacing-8);
  font-size: var(--font-size-lg);
}

.btn-full {
  width: 100%;
}

/* ===========================================
   ICON BUTTONS
   =========================================== */

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-icon-xs {
  width: 24px;
  height: 24px;
}

.btn-icon-sm {
  width: 28px;
  height: 28px;
}

.btn-icon-lg {
  width: 44px;
  height: 44px;
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

.btn-icon-sm svg {
  width: 14px;
  height: 14px;
}

.btn-icon-lg svg {
  width: 22px;
  height: 22px;
}

/* ===========================================
   BUTTON LOADING STATE
   =========================================== */

.btn.is-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.is-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-primary.is-loading::after {
  border-color: var(--color-text-inverse);
  border-top-color: transparent;
}

/* ===========================================
   BUTTON GROUPS
   =========================================== */

.btn-group {
  display: inline-flex;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.btn-group .btn:not(:first-child) {
  margin-left: -1px;
}

/* ===========================================
   BUTTON WITH ICON
   =========================================== */

.btn-with-icon {
  gap: var(--spacing-2);
}

.btn-with-icon svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ===========================================
   SPIN ANIMATION (for loading)
   =========================================== */

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}