/* ═══════════════════════════════════════════════════════════════════════
   Components — Buttons
   5 variants: primary, secondary, ghost, danger, icon
   ═══════════════════════════════════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--touch);
  padding: var(--space-3) var(--space-5);
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: 1;
  letter-spacing: 0.01em;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background var(--tr),
    border-color var(--tr),
    color var(--tr),
    transform var(--tr-fast),
    box-shadow var(--tr);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

/* ─── Variant: Primary (Gold gradient + glow) ──────────────────── */
.btn-primary {
  background: var(--grad-gold);
  color: var(--text-on-gold);
  font-weight: var(--weight-bold);
  border: 1px solid var(--gold-light);
  box-shadow:
    0 4px 16px rgba(255, 46, 198, 0.20),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.25) 50%,
    transparent 100%
  );
  transform: translateX(-100%);
  transition: transform 600ms ease;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #c026d3 0%, #7dd3fc 50%, #7dd3fc 100%);
  box-shadow:
    0 8px 24px rgba(255, 46, 198, 0.35),
    0 0 32px rgba(255, 46, 198, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  transform: translateY(-1px);
}

.btn-primary:hover::before {
  transform: translateX(100%);
}

/* ─── Variant: Secondary (Outlined gold) ──────────────────────── */
.btn-secondary {
  background: transparent;
  color: var(--gold);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 0 rgba(255, 46, 198, 0);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gold-soft);
  border-color: var(--gold-light);
  color: var(--gold-light);
  box-shadow: 0 0 24px rgba(255, 46, 198, 0.25);
}

/* ─── Variant: Ghost (Subtle hover) ────────────────────────────── */
.btn-ghost {
  background: transparent;
  color: var(--text-soft);
  border: 1px solid transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--surface-2);
  color: var(--gold);
  border-color: var(--line);
}

/* ─── Variant: Danger ──────────────────────────────────────────── */
.btn-danger {
  background: var(--danger);
  color: white;
  border: 1px solid rgba(239, 68, 68, 0.5);
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.20);
}

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  box-shadow: 0 6px 24px rgba(239, 68, 68, 0.35);
}

/* ─── Variant: Success ─────────────────────────────────────────── */
.btn-success {
  background: var(--success);
  color: white;
  border: 1px solid rgba(16, 185, 129, 0.5);
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.20);
}

.btn-success:hover:not(:disabled) {
  background: #059669;
}

/* ─── Variant: WhatsApp ────────────────────────────────────────── */
.btn-whatsapp {
  background: #25D366;
  color: white;
  border: 1px solid rgba(37, 211, 102, 0.5);
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.25);
}

.btn-whatsapp:hover:not(:disabled) {
  background: #1ebe57;
  box-shadow: 0 6px 24px rgba(37, 211, 102, 0.40);
}

/* ─── Sizes ────────────────────────────────────────────────────── */
.btn-sm {
  min-height: 36px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  min-height: 56px;
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  border-radius: var(--r-lg);
}

.btn-xl {
  min-height: 64px;
  padding: var(--space-5) var(--space-7);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  border-radius: var(--r-lg);
  letter-spacing: 0.02em;
}

/* ─── Icon-only buttons (44x44 minimum for touch) ──────────────── */
.btn-icon {
  width: var(--touch);
  height: var(--touch);
  padding: 0;
  border-radius: var(--r-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon.btn-sm {
  width: 36px;
  height: 36px;
}

.btn-icon.btn-lg {
  width: 56px;
  height: 56px;
}

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

.btn-icon.btn-sm svg { width: 16px; height: 16px; }
.btn-icon.btn-lg svg { width: 24px; height: 24px; }

/* ─── Full-width button (mobile-friendly) ──────────────────────── */
.btn-block {
  width: 100%;
}

/* ─── Button group ─────────────────────────────────────────────── */
.btn-group {
  display: inline-flex;
  gap: var(--space-2);
}

.btn-group-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
}

@media (min-width: 640px) {
  .btn-group-stack {
    flex-direction: row;
    justify-content: flex-end;
    width: auto;
  }
}

/* ─── Loading state ────────────────────────────────────────────── */
.btn[aria-busy="true"] {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn[aria-busy="true"]::after {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.7s linear infinite;
  color: var(--text-on-gold);
}

.btn-secondary[aria-busy="true"]::after,
.btn-ghost[aria-busy="true"]::after {
  color: var(--gold);
}

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

/* ─── Magnetic hover effect (advanced — JS-enhanced) ───────────── */
.btn-magnetic {
  transition:
    transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1),
    background var(--tr),
    box-shadow var(--tr);
}

/* ─── RTL adjustments ──────────────────────────────────────────── */
[dir="rtl"] .btn-primary::before {
  transform: translateX(100%);
}

[dir="rtl"] .btn-primary:hover::before {
  transform: translateX(-100%);
}