.category-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 190;
  background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.category-nav-accent {
  height: 3px;
  background: var(--gradient-primary);
}

.category-nav-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 56px;
  padding-block: 8px;
}

.category-nav-explore {
  position: relative;
  flex-shrink: 0;
}

.category-nav-explore-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  font-family: var(--font);
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}

.category-nav-explore-btn:hover,
.category-nav-explore-btn.is-open {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: var(--focus-ring);
}

.category-nav-explore-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--gradient-primary);
  color: #fff;
}

.category-nav-explore-icon svg {
  width: 18px;
  height: 18px;
}

.category-nav-explore-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.category-nav-explore-label {
  font-size: 0.86rem;
  font-weight: 800;
  color: var(--text);
}

.category-nav-explore-sub {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.category-nav-chevron {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-left: 2px;
}

.category-nav-rail {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  padding-block: 4px;
}

.category-nav-rail::-webkit-scrollbar {
  display: none;
}

.category-nav-skeleton-explore {
  width: 148px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: category-nav-shimmer 1.2s infinite;
  flex-shrink: 0;
}

.category-nav-skeleton-rail {
  display: flex;
  gap: 8px;
  overflow: hidden;
  flex: 1;
}

.category-nav-skeleton-chip {
  width: 88px;
  height: 36px;
  border-radius: 999px;
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: category-nav-shimmer 1.2s infinite;
  flex-shrink: 0;
}

@keyframes category-nav-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.category-nav-pill {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px 8px 10px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: border-color 0.2s, background 0.2s, color 0.2s, transform 0.2s;
}

.category-nav-pill:hover {
  border-color: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-1px);
}

.category-nav-pill.is-active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.1);
}

.category-nav-pill-icon {
  font-size: 1.05rem;
  line-height: 1;
}

.category-nav-pill-label {
  line-height: 1.2;
}

.category-mega-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  width: min(960px, calc(100vw - 32px));
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 20px 22px 24px;
  max-height: min(72vh, 560px);
  overflow-y: auto;
}

.category-mega-menu[hidden] {
  display: none !important;
}

.category-mega-intro {
  margin: 0 0 14px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-muted);
}

.category-mega-tree {
  margin: 0;
}

.category-tree {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 28px;
}

.category-tree-group {
  margin: 0;
  padding: 0;
  break-inside: avoid;
}

.category-tree-parent {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text);
  transition: background 0.2s, color 0.2s;
}

.category-tree-parent:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

.category-tree-icon {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--primary-light);
  font-size: 1rem;
  flex-shrink: 0;
}

.category-tree-name {
  line-height: 1.25;
}

.category-tree-children {
  list-style: none;
  margin: 2px 0 10px 26px;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--border);
}

.category-tree-children li {
  margin: 0;
  padding: 0;
}

.category-tree-child {
  display: block;
  position: relative;
  padding: 7px 8px 7px 14px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: background 0.2s, color 0.2s;
}

.category-tree-child::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--border);
  transform: translateY(-50%);
}

.category-tree-child:hover {
  background: var(--surface-2);
  color: var(--primary-dark);
}

@media (max-width: 900px) {
  .category-tree {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}

@media (max-width: 640px) {
  .category-nav-explore-sub {
    display: none;
  }

  .category-nav-pill-label {
    display: none;
  }

  .category-nav-pill {
    padding: 8px 10px;
  }

  .category-mega-menu {
    position: fixed;
    top: calc(var(--header-h) + var(--category-nav-h));
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-height: none;
    border-radius: 0;
    border-left: none;
    border-right: none;
    padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
    z-index: 195;
  }
}

.category-nav-skeleton-explore {
  width: 148px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: category-nav-shimmer 1.2s infinite;
  flex-shrink: 0;
}

.category-nav-skeleton-rail {
  display: flex;
  gap: 8px;
  overflow: hidden;
  flex: 1;
}

.category-nav-skeleton-chip {
  width: 88px;
  height: 36px;
  border-radius: 999px;
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: category-nav-shimmer 1.2s infinite;
  flex-shrink: 0;
}

@keyframes category-nav-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}