/* ============================================
   Phase 3 — Sticky header + search/filter shell
   ============================================ */

:root {
  --sticky-header-h: 72px;
  --sticky-header-h-compact: 56px;
  --sticky-header-transition: 220ms;
  --sticky-header-glass: rgba(10, 10, 10, 0.72);
  --sticky-header-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

html {
  --browse-sticky-offset: var(--sticky-header-h);
}

html.past-hero {
  --browse-sticky-offset: var(--sticky-header-h-compact);
}

.sticky-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-sticky-header);
  pointer-events: none;
}

.sticky-header__bar {
  pointer-events: auto;
  height: var(--sticky-header-h);
  padding: 0 var(--space-4);
  border-bottom: 1px solid transparent;
  background: transparent;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  box-shadow: none;
  opacity: 0;
  transform: translate3d(0, -10px, 0);
  transition:
    height var(--sticky-header-transition) var(--ease-master),
    background var(--sticky-header-transition) var(--ease-master),
    border-color var(--sticky-header-transition) var(--ease-master),
    box-shadow var(--sticky-header-transition) var(--ease-master),
    backdrop-filter var(--sticky-header-transition) var(--ease-master),
    opacity var(--sticky-header-transition) var(--ease-master),
    transform var(--sticky-header-transition) var(--ease-master);
  will-change: transform, opacity;
}

html.past-hero .sticky-header__bar {
  height: var(--sticky-header-h-compact);
  background: var(--sticky-header-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--border-soft);
  box-shadow: var(--sticky-header-shadow);
}

html.scroll-down.past-hero .sticky-header__bar {
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.34);
}

html.scroll-up.past-hero .sticky-header__bar {
  box-shadow: var(--sticky-header-shadow);
}

.sticky-header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.sticky-header__logo {
  flex-shrink: 0;
  font-family: var(--font-heading);
  font-size: 10px;
  font-weight: var(--weight-semibold);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-primary);
  line-height: 1.15;
  padding: var(--space-2) 0;
  transition: transform var(--sticky-header-transition) var(--ease-master);
  transform-origin: left center;
  transform: translateZ(0);
}

.sticky-header__logo-accent {
  display: block;
  margin-top: 2px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  background: linear-gradient(90deg, #ffffff 0%, var(--accent-soft-gold) 55%, var(--accent-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

html.past-hero .sticky-header__logo {
  transform: scale(0.92) translateZ(0);
}

.sticky-header__search-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  min-width: 0;
  position: relative;
}

.sticky-header--search-open .sticky-header__search-wrap {
  justify-content: stretch;
}

.sticky-header__search-trigger {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  color: var(--text-primary);
  transition:
    width var(--dur-slow) var(--ease-master),
    opacity var(--dur-base) var(--ease-master),
    transform var(--dur-fast) var(--ease-master),
    border-color var(--dur-base) var(--ease-master);
  transform: translateZ(0);
}

.sticky-header__search-trigger:active {
  transform: scale(0.97) translateZ(0);
}

.sticky-header--search-open .sticky-header__search-trigger {
  width: 0;
  min-width: 0;
  opacity: 0;
  padding: 0;
  border-width: 0;
  overflow: hidden;
  pointer-events: none;
}

.sticky-header__search-panel {
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  flex: 0;
  transform: translate3d(8px, 0, 0);
  transition:
    max-width var(--dur-slow) var(--ease-master),
    opacity var(--dur-base) var(--ease-master),
    transform var(--dur-base) var(--ease-master),
    flex var(--dur-slow) var(--ease-master);
  will-change: max-width, opacity, transform;
}

.sticky-header--search-open .sticky-header__search-panel {
  flex: 1;
  max-width: 100%;
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.sticky-header__search-field {
  height: 52px;
  width: 100%;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-soft);
  transition:
    border-color var(--dur-base) var(--ease-master),
    box-shadow var(--dur-base) var(--ease-master),
    transform var(--dur-fast) var(--ease-master);
}

.sticky-header__search-field:focus-within {
  border-color: rgba(212, 175, 55, 0.45);
  box-shadow: var(--shadow-glow), 0 6px 20px rgba(0, 0, 0, 0.25);
  transform: translateY(-1px);
}

.sticky-header__search-field .search-bar__input {
  min-width: 0;
}

.sticky-header__cart {
  position: relative;
  flex-shrink: 0;
  min-width: 48px;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  color: var(--text-primary);
  transition:
    transform var(--dur-fast) var(--ease-master),
    opacity var(--dur-base) var(--ease-master),
    box-shadow var(--dur-base) var(--ease-master);
  transform: translateZ(0);
}

.sticky-header__cart:active {
  transform: scale(0.97) translateZ(0);
}

.sticky-header__cart--empty {
  opacity: 0.55;
}

.sticky-header__badge {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: var(--radius-pill);
  background: var(--accent-gold);
  color: #0a0a0a;
  font-size: 10px;
  font-weight: var(--weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    opacity var(--dur-fast) var(--ease-master),
    transform var(--dur-fast) var(--ease-master);
}

.sticky-header__badge.cart-count--bump,
.bottom-nav__cart-badge.cart-count--bump {
  animation: cart-count-bump 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes cart-count-bump {
  0% {
    transform: scale(1);
  }
  45% {
    transform: scale(1.28);
  }
  100% {
    transform: scale(1);
  }
}

.sticky-header__cart.cart-ui--shake,
.bottom-nav__link--cart.cart-ui--shake {
  animation: cart-ui-shake 0.45s ease;
}

@keyframes cart-ui-shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-4px);
  }
  40% {
    transform: translateX(4px);
  }
  60% {
    transform: translateX(-3px);
  }
  80% {
    transform: translateX(3px);
  }
}

.sticky-header__badge[data-count="0"] {
  opacity: 0;
  transform: scale(0.6);
  pointer-events: none;
}

.sticky-header__cart--pulse {
  animation: cart-pulse 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes cart-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.35);
  }
  70% {
    box-shadow: 0 0 0 12px rgba(212, 175, 55, 0);
  }
  100% {
    box-shadow: none;
  }
}

html.site-ready .sticky-header__bar {
  animation: stickyBarReveal var(--sticky-header-transition) 120ms var(--ease-master) forwards;
}

@keyframes stickyBarReveal {
  from {
    opacity: 0;
    transform: translate3d(0, -10px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

/* ---------- Sticky search + category region ---------- */
.search-filter-area {
  position: sticky;
  top: var(--browse-sticky-offset);
  z-index: var(--z-sticky-browse);
  margin: 0 calc(-1 * var(--space-4));
  padding: var(--space-3) var(--space-4) var(--space-2);
  background: linear-gradient(
    180deg,
    rgba(10, 10, 10, 0.97) 0%,
    rgba(10, 10, 10, 0.88) 55%,
    rgba(10, 10, 10, 0) 100%
  );
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: top var(--sticky-header-transition) var(--ease-master);
}

@media (min-width: 480px) {
  .search-filter-area {
    margin: 0 calc(-1 * var(--space-6));
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

.category-pill--flash {
  animation: category-pill-flash var(--dur-base) var(--ease-master);
}

@keyframes category-pill-flash {
  0% {
    filter: brightness(1);
  }
  40% {
    filter: brightness(1.15);
  }
  100% {
    filter: brightness(1);
  }
}

#catalog,
#search-filter-area,
#category-scroll {
  scroll-margin-top: calc(var(--browse-sticky-offset) + var(--space-3));
}

@media (prefers-reduced-motion: reduce) {
  html.site-ready .sticky-header__bar {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}