/* =============================================================================
   PEARL VEIL — BUTTONS
   ─────────────────────────────────────────────────────────────────────────────
   Complete button system. All variants derived from base .btn class.
   ============================================================================= */

/* ─── BASE BUTTON ─────────────────────────────────────────────────────────────  */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: var(--btn-height);
  padding: 0 var(--btn-padding-x);
  font-family: var(--font-body);
  font-size: var(--btn-font);
  font-weight: var(--btn-weight);
  letter-spacing: var(--btn-tracking);
  text-transform: uppercase;
  white-space: nowrap;
  border-radius: var(--btn-radius);
  transition: var(--btn-transition, var(--transition-base));
  position: relative;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

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

/* ─── PRIMARY BUTTON ──────────────────────────────────────────────────────────
   Dark fill — primary CTA
----------------------------------------------------------------------------- */

.btn-primary {
  background-color: var(--color-heading);
  color: var(--color-ivory);
  border-color: var(--color-heading);
}

.btn-primary:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-accent);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* ─── ACCENT BUTTON ───────────────────────────────────────────────────────────
   Pearl gold fill
----------------------------------------------------------------------------- */

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-accent:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  box-shadow: var(--shadow-accent);
  transform: translateY(-1px);
}

.btn-accent:active {
  transform: translateY(0);
}

/* ─── OUTLINE BUTTON ──────────────────────────────────────────────────────────
   Transparent with border
----------------------------------------------------------------------------- */

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

.btn-outline:hover {
  background-color: var(--color-heading);
  color: var(--color-ivory);
}

/* Outline on dark backgrounds */
.btn-outline-light {
  background-color: transparent;
  color: var(--color-ivory);
  border-color: rgba(248, 245, 240, 0.5);
}

.btn-outline-light:hover {
  background-color: var(--color-ivory);
  color: var(--color-heading);
  border-color: var(--color-ivory);
}

/* ─── GHOST BUTTON ────────────────────────────────────────────────────────────
   Minimal — text with no border
----------------------------------------------------------------------------- */

.btn-ghost {
  background-color: transparent;
  color: var(--color-muted);
  border-color: transparent;
  letter-spacing: var(--tracking-wider);
}

.btn-ghost:hover {
  color: var(--color-heading);
  background-color: var(--color-bg-alt);
}

/* ─── SIZES ───────────────────────────────────────────────────────────────────  */

.btn-sm {
  height: var(--btn-height-sm);
  padding: 0 var(--btn-padding-x-sm);
  font-size: var(--text-xs);
}

.btn-lg {
  height: var(--btn-height-lg);
  padding: 0 calc(var(--btn-padding-x) * 1.4);
  font-size: var(--text-sm);
}

/* Full width */
.btn-full {
  width: 100%;
}

/* ─── ICON BUTTON ─────────────────────────────────────────────────────────────
   Square icon-only buttons (nav icons, wishlist, etc.)
----------------------------------------------------------------------------- */

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  background: transparent;
  color: var(--color-heading);
  border: none;
  transition: var(--transition-base);
}

.btn-icon:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-accent);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* ─── LOADING STATE ───────────────────────────────────────────────────────────  */

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

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  animation: btnSpin 0.6s linear infinite;
}

.btn-outline.loading::after,
.btn-ghost.loading::after {
  border-color: rgba(26, 26, 26, 0.2);
  border-top-color: var(--color-heading);
}

@keyframes btnSpin {
  to { transform: rotate(360deg); }
}

/* ─── LINK BUTTON ─────────────────────────────────────────────────────────────
   Looks like a text link, behaves like a button
----------------------------------------------------------------------------- */

.btn-link {
  background: none;
  border: none;
  padding: 0;
  height: auto;
  color: var(--color-accent);
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: 0;
  text-transform: none;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: transparent;
  transition: var(--transition-color);
}

.btn-link:hover {
  text-decoration-color: currentColor;
  color: var(--color-accent-dark);
}