/* ===========================================
   BUTTONS - Updated for new design system
   =========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

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

/* Sizes */
.btn-xs { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-sm { padding: var(--space-1.5) var(--space-4); font-size: var(--text-sm); }
.btn-lg { padding: var(--space-3) var(--space-6); font-size: var(--text-base); }
.btn-xl { padding: var(--space-4) var(--space-8); font-size: var(--text-lg); }
.btn-block { width: 100%; }

/* Variants */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.btn-secondary {
  background: var(--color-surface-container);
  color: var(--color-on-surface);
  border-color: var(--color-outline);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-surface-container-high);
  border-color: var(--color-outline-strong);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover:not(:disabled) {
  background: var(--color-primary-50);
}
[data-theme="dark"] .btn-outline:hover:not(:disabled) {
  background: var(--color-primary-900);
}

.btn-ghost {
  background: transparent;
  color: var(--color-on-surface-variant);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-container);
  color: var(--color-on-surface);
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-white);
}
.btn-danger:hover:not(:disabled) {
  background: #B71C1C;
}

.btn-glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-color: var(--glass-border);
  color: var(--color-on-surface);
  box-shadow: var(--glass-shadow);
}
.btn-glass:hover:not(:disabled) {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border-strong);
  box-shadow: var(--glass-shadow-strong);
}

/* Icon button */
.btn-icon {
  padding: var(--space-2);
  border-radius: var(--radius-full);
  aspect-ratio: 1;
}
.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* Loading state */
.btn.is-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}
.btn.is-loading::after {
  content: '';
  position: absolute;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* Ripple effect */
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--duration-fast);
  pointer-events: none;
}
.btn:active::before {
  opacity: 0.1;
  animation: ripple 0.4s var(--ease-out);
}
@keyframes ripple {
  from { transform: scale(0); opacity: 0.15; }
  to { transform: scale(2); opacity: 0; }
}

.w-full { width: 100%; }