/**
 * UI Enhancements — micro-animations, sticky header,
 * scroll-reveal, add-to-cart feedback, trust strip
 */

/* ============================================
   Sticky Shrinking Header
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: var(--color-surface);
  box-shadow: none;
  transition: box-shadow var(--transition-base), padding var(--transition-base);
}

.site-header.header-scrolled {
  box-shadow: var(--shadow-md);
}

.site-header.header-scrolled .navbar-primary {
  padding-block: var(--space-1);
}

.site-header.header-scrolled .site-logo {
  max-height: 36px;
}

.site-header.header-scrolled .navbar-categories {
  display: none;
}

/* ============================================
   Trust Strip
   ============================================ */
.trust-strip {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border-light);
  padding-block: var(--space-3);
}

.trust-strip-list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.trust-strip-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

@media (max-width: 575px) {
  .trust-strip-item {
    white-space: normal;
    text-align: center;
    flex-direction: column;
    font-size: var(--text-xs);
  }
}

.trust-strip-item i {
  font-size: var(--text-lg);
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Dividers between trust items (hidden on mobile) */
.trust-strip-item + .trust-strip-item::before {
  content: '·';
  color: var(--color-border);
  margin-inline-end: var(--space-6);
  display: none;
}

@media (min-width: 768px) {
  .trust-strip-item + .trust-strip-item::before {
    display: block;
  }
}

/* ============================================
   Add-to-Cart Micro-Animation
   ============================================ */
.btn-add-to-cart {
  position: relative;
  overflow: hidden;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-add-to-cart.btn-success-anim {
  background: var(--color-success) !important;
  border-color: var(--color-success) !important;
  transform: scale(0.97);
  pointer-events: none;
}

.btn-add-to-cart.btn-success-anim::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-white);
  background: var(--color-success);
  animation: checkPop 0.3s ease;
}

@keyframes checkPop {
  0%   { opacity: 0; transform: scale(0.5); }
  60%  { transform: scale(1.1); }
  100% { opacity: 1; transform: scale(1); }
}

/* ============================================
   Wishlist Heart Burst Animation
   ============================================ */
.product-wishlist.wishlisted {
  color: var(--color-error) !important;
  background: color-mix(in srgb, var(--color-error) 10%, var(--color-white)) !important;
  animation: heartBurst 0.4s ease;
}

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

/* ============================================
   Staggered Scroll-Reveal for Product Cards
   ============================================ */
.product-card-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.product-card-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays — reset every 4 items (4n+1 = first in each row) */
.product-card-reveal:nth-child(4n+1) { transition-delay: 0ms; }
.product-card-reveal:nth-child(4n+2) { transition-delay: 80ms; }
.product-card-reveal:nth-child(4n+3) { transition-delay: 160ms; }
.product-card-reveal:nth-child(4n+4) { transition-delay: 240ms; }

/* ============================================
   Mobile Search Bar (below primary nav)
   ============================================ */
.mobile-search-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--space-2) var(--space-3);
}

/* ── Alternating Section Backgrounds ─────────────────────── */
/* Apply tinted background to even homepage sections for visual rhythm */
.homepage-section--tinted {
  background-color: var(--color-background);  /* #F1F5F9 - light slate */
}

.homepage-section--white {
  background-color: var(--color-surface);     /* #FFFFFF */
}

/* ── Extended Scroll-Reveal: Category + Banner Cards ─────── */
.category-card-modern,
.banner-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.category-card-modern.revealed,
.banner-card.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Reduced Motion Overrides
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .product-card-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .category-card-modern,
  .banner-card {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn-add-to-cart.btn-success-anim::after {
    animation: none;
  }

  .product-wishlist.wishlisted {
    animation: none;
  }

  .announcement-bar-item {
    animation: none;
  }
}