/* ============================================================
   MARKUS PRO — Animations
   All @keyframes live here. Only transform + opacity used
   (GPU-accelerated, no layout triggers).
============================================================ */

/* ── Entrance ────────────────────────────────────────────── */

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

/* ── Page entrance ───────────────────────────────────────── */

.page-enter {
  animation: fadeIn var(--dur-enter) var(--ease-standard) both;
}

/* ── Product card entrance with stagger ─────────────────── */

.card-enter {
  animation: fadeInUp 400ms var(--ease-standard) both;
  animation-delay: calc(var(--card-i, 0) * 60ms);
}

/* ── Micro-interactions ──────────────────────────────────── */

@keyframes heartPulse {
  0%   { transform: scale(1); }
  30%  { transform: scale(1.35); }
  60%  { transform: scale(0.9); }
  100% { transform: scale(1); }
}

.heart-pulse {
  animation: heartPulse 400ms var(--ease-standard);
}

@keyframes badgePop {
  0%   { transform: scale(0.6); }
  60%  { transform: scale(1.25); }
  100% { transform: scale(1); }
}

.badge-pop {
  animation: badgePop 300ms var(--ease-standard);
}

/* ── Spinner ─────────────────────────────────────────────── */

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

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-default);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

/* ── Skeleton shimmer ────────────────────────────────────── */

@keyframes shimmer {
  from { background-position: -400px 0; }
  to   { background-position: 400px 0; }
}

.skeleton {
  border-radius: var(--radius-sm);
  background: linear-gradient(
    90deg,
    var(--bg-card) 25%,
    var(--bg-card-hover) 50%,
    var(--bg-card) 75%
  );
  background-size: 800px 100%;
  animation: shimmer 1.4s ease-in-out infinite;
}

/* ── Scroll-to-top button ────────────────────────────────── */

.scroll-top-btn {
  position: fixed;
  bottom: var(--sp-8);
  right: var(--sp-8);
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  z-index: var(--z-sticky);
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity var(--transition-base),
    transform var(--transition-base),
    background var(--transition-fast),
    color var(--transition-fast);
  pointer-events: none;
}

.scroll-top-btn.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.scroll-top-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
}

/* ── Prefers reduced motion ──────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .card-enter,
  .page-enter,
  .heart-pulse,
  .badge-pop,
  .spinner { animation: none !important; }

  .skeleton {
    background: var(--bg-card);
    animation: none;
  }

  .scroll-top-btn { transition: opacity 0ms; }
}