/* ============================================
   BbikeShop - Porto-Inspired Design System
   Light default + Dark mode support
   ============================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors - Light Mode (Porto style) */
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F6F7F8;
  --color-bg-tertiary: #EEEFF1;
  --color-surface: #FFFFFF;
  --color-text: #222529;
  --color-text-secondary: #7A7D82;
  --color-text-muted: #999999;
  --color-border: #E7E7E7;
  --color-border-light: #F0F0F0;

  /* Primary - Porto Blue */
  --color-primary: #dc3550;
  --color-primary-hover: #ea5068;
  --color-primary-light: #EBF2FC;
  --color-primary-soft: #C5DAFC;

  /* Accent - Gold/Yellow (Porto CTA) */
  --color-accent: #E11D48;
  --color-accent-hover: #BE123C;
  --color-accent-light: #FFF1F2;
  --color-accent-soft: #FECDD3;

  /* Porto Gold */
  --color-gold: #F0AD4E;
  --color-gold-hover: #D9971A;

  /* Semantic */
  --color-success: #50B948;
  --color-success-light: #ECFDF5;
  --color-warning: #F0AD4E;
  --color-warning-light: #FFFBEB;
  --color-danger: #DC2626;
  --color-danger-light: #FEF2F2;
  --color-info: #0B5ED7;

  /* Shadows (lighter for Porto's clean look) */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 2px 6px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
  --shadow-xl: 0 16px 40px rgba(0,0,0,0.12);

  /* Radius */
  --radius-sm: 0.25rem;
  --radius: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 200ms ease;
  --transition-slow: 300ms ease;

  /* Header heights */
  --topbar-height: 36px;
  --searchbar-height: 72px;
  --navbar-height: 48px;
  --header-total-height: 156px; /* sum of all 3 tiers */
  --navbar-bg: rgba(255,255,255,0.98);
}

/* --- Dark Mode --- */
.dark {
  --color-bg: #0D1117;
  --color-bg-secondary: #161B22;
  --color-bg-tertiary: #21262D;
  --color-surface: #161B22;
  --color-text: #F0F3F6;
  --color-text-secondary: #8B949E;
  --color-text-muted: #6E7681;
  --color-border: #30363D;
  --color-border-light: #21262D;

  --color-primary: #dc3550;

  --color-primary-light: rgba(88,166,255,0.1);
  --color-primary-soft: rgba(88,166,255,0.2);

  --color-accent: #FB7185;
  --color-accent-hover: #F43F5E;
  --color-accent-light: rgba(251,113,133,0.1);
  --color-accent-soft: rgba(251,113,133,0.2);

  --color-gold: #F0AD4E;

  --color-success: #3FB950;
  --color-success-light: rgba(63,185,80,0.1);
  --color-warning: #D29922;
  --color-warning-light: rgba(210,153,34,0.1);
  --color-danger: #F85149;
  --color-danger-light: rgba(248,81,73,0.1);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 2px 6px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);

  --navbar-bg: rgba(13,17,23,0.98);
}

/* --- Global Styles --- */
*, *::before, *::after { box-sizing: border-box; }
body {
  font-family: 'Inter', 'Prompt', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  margin: 0;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

/* --- Selection --- */
::selection { background-color: var(--color-primary-soft); color: var(--color-primary); }

/* --- Links --- */
a { color: inherit; text-decoration: none; transition: color var(--transition-fast); }

/* ============================================
   HEADER - 3-Tier Porto Style
   ============================================ */

/* Top Bar */
.header-topbar {
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.8125rem;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
}
.dark .header-topbar {
  background: var(--color-bg-secondary);
}
.header-topbar a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}
.header-topbar a:hover {
  color: var(--color-primary);
}

/* Search Bar (Middle tier) */
.header-searchbar {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--searchbar-height);
  display: flex;
  align-items: center;
}
.search-input-group {
  display: flex;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-full);
  overflow: hidden;
  flex: 1;
  max-width: 680px;
  height: 46px;
  transition: box-shadow var(--transition);
}
.search-input-group:focus-within {
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.search-input-group input {
  flex: 1;
  border: none;
  padding: 0 1rem;
  font-size: 0.875rem;
  outline: none;
  background: var(--color-bg);
  color: var(--color-text);
  min-width: 0;
}
.search-input-group input::placeholder {
  color: var(--color-text-muted);
}
.search-input-group .search-cat-select {
  border: none;
  border-left: 1px solid var(--color-border);
  padding: 0 1rem;
  font-size: 0.8125rem;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  cursor: pointer;
  outline: none;
  min-width: 140px;
}
.search-input-group .search-btn {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: 0 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
  font-size: 1.125rem;
}
.search-input-group .search-btn:hover {
  background: var(--color-primary-hover);
}

/* Header user actions */
.header-user-action {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  transition: color var(--transition-fast);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius);
}
.header-user-action:hover {
  color: var(--color-primary);
}
.header-user-action i {
  font-size: 1.5rem;
}
.header-user-action .action-text {
  font-size: 0.75rem;
  line-height: 1.3;
}
.header-user-action .action-text strong {
  font-size: 0.875rem;
  display: block;
}

/* Main Navigation (Bottom tier) */
.header-nav {
  background: var(--color-primary);
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.dark .header-nav {
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
}
.header-nav a, .header-nav button {
  color: rgba(255,255,255,0.9);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: none;
  background: transparent;
  cursor: pointer;
}
.dark .header-nav a, .dark .header-nav button {
  color: var(--color-text-secondary);
}
.header-nav a:hover, .header-nav button:hover {
  color: white;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius);
}
.dark .header-nav a:hover, .dark .header-nav button:hover {
  color: var(--color-text);
  background: rgba(255,255,255,0.05);
}
.header-nav a.active {
  color: white;
  background: rgba(255,255,255,0.15);
  border-radius: var(--radius);
}
.dark .header-nav a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* All Departments Button */
.all-dept-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem !important;
  font-weight: 600 !important;
  font-size: 0.875rem !important;
  border-right: 1px solid rgba(255,255,255,0.15) !important;
  margin-right: 0.5rem;
}

/* Best Offers label */
.nav-highlight {
  margin-left: auto;
  color: var(--color-gold) !important;
  font-weight: 600 !important;
}
.dark .nav-highlight {
  color: var(--color-gold) !important;
}

/* Topbar Links */
.topbar-link {
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  transition: color var(--transition-fast);
  background: none;
  padding: 0;
}
.topbar-link:hover {
  color: var(--color-primary);
}
.dark .topbar-link {
  color: var(--color-text-muted);
}
.dark .topbar-link:hover {
  color: var(--color-primary);
}

/* Active mobile link */
.active-mobile-link {
  background: var(--color-primary-light) !important;
  color: var(--color-primary) !important;
}
.active-mobile-link i {
  color: var(--color-primary) !important;
}

/* Mega Menu Panel */
.mega-menu-panel {
  position: fixed;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  z-index: 55;
  max-height: 70vh;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
}
.mega-menu-panel.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}
.dark .mega-menu-panel {
  background: var(--color-surface);
  border-bottom-color: var(--color-border);
}

/* Category item in mega menu */
.mega-menu-link {
  display: flex;
  align-items: center;
  padding: 0.375rem 0.5rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.mega-menu-link:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}
.category-logo {
  width: 24px;
  height: 24px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}
.category-logo-sm {
  width: 20px;
  height: 20px;
}

/* Highlight for search */
.highlight {
  background-color: var(--color-gold);
  color: #222;
  border-radius: 2px;
  padding: 0 2px;
}

/* ============================================
   CARD COMPONENT
   ============================================ */
.card-clean {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}
.card-clean:hover {
  box-shadow: var(--shadow-md);
}

/* ============================================
   PRODUCT CARD - Porto Style
   ============================================ */
.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.product-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.product-card .product-image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: var(--color-bg-secondary);
}
.product-card .product-image-wrap > img:first-child {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.product-card:hover .product-image-wrap > img:first-child {
  transform: scale(1.05);
}
/* Brand badge on product card - small logo at top-right corner */
.product-card .product-image-wrap .brand-badge {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 4px;
  background: rgba(255,255,255,0.95);
  padding: 2px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  pointer-events: none;
}
.product-card .product-actions {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 0.75rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.4));
  transform: translateY(100%);
  transition: transform var(--transition);
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}
.product-card:hover .product-actions {
  transform: translateY(0);
}
.product-card .product-body {
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
  flex: 1;
  text-align: center;
}
.product-card .product-category {
  font-size: 0.6875rem;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  margin-bottom: 0.375rem;
}
.product-card .product-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
  margin-bottom: 0.375rem;
}
.product-card:hover .product-name {
  color: var(--color-primary);
}
.product-card .product-rating {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.125rem;
  margin-bottom: 0.375rem;
}
.product-card .product-rating i {
  font-size: 0.75rem;
  color: var(--color-gold);
}
.product-card .product-price {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: auto;
}
.product-card .product-price-sale {
  color: var(--color-accent);
}
.product-card .product-price-original {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: line-through;
  margin-left: 0.375rem;
}
.product-card .product-discount-badge {
  position: absolute;
  top: 0.625rem;
  left: 0.625rem;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  z-index: 2;
}
.product-card .badge-hot {
  background: var(--color-success);
  color: white;
}
.product-card .badge-sale {
  background: var(--color-accent);
  color: white;
}

/* ============================================
   BADGES
   ============================================ */
.badge-accent {
  background: var(--color-accent);
  color: white;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-full);
  line-height: 1;
}
.badge-primary {
  background: var(--color-primary);
  color: white;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-full);
  line-height: 1;
}

/* ============================================
   BUTTONS - Porto Style
   ============================================ */
.btn-primary {
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  padding: 0.625rem 1.5rem;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(11,94,215,0.3);
}

.btn-accent {
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  padding: 0.625rem 1.5rem;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.btn-accent:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 12px rgba(225,29,72,0.3);
}
.btn-accent:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.625rem 1.5rem;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.btn-ghost {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  padding: 0;
}
.btn-ghost:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ============================================
   FORM INPUTS - Porto Style
   ============================================ */
.input-clean {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input-clean:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.input-clean::placeholder {
  color: var(--color-text-muted);
}

/* ============================================
   DROPDOWN
   ============================================ */
.dropdown-clean {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  overflow: hidden;
}
.dropdown-item-clean {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  color: var(--color-text);
  transition: background-color var(--transition-fast);
}
.dropdown-item-clean:hover {
  background-color: var(--color-bg-secondary);
}

/* ============================================
   CATEGORY CARDS - Porto Circular Style
   ============================================ */
.category-circle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  transition: transform var(--transition);
}
.category-circle:hover {
  transform: translateY(-4px);
}
.category-circle .cat-icon {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--color-border);
  transition: all var(--transition);
  background: var(--color-bg-secondary);
}
.category-circle:hover .cat-icon {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(11,94,215,0.2);
}
.category-circle .cat-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.category-circle .cat-name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
}
.category-circle .cat-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ============================================
   FEATURED CATEGORY CARDS (Horizontal)
   ============================================ */
.featured-cat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  border: 1px solid transparent;
}
.featured-cat-card:hover {
  background: var(--color-bg);
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
}
.featured-cat-card img {
  width: 72px;
  height: 72px;
  object-fit: contain;
  flex-shrink: 0;
}
.featured-cat-card .fcc-name {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text);
}
.featured-cat-card .fcc-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}
.featured-cat-card .fcc-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 0.5rem;
  transition: color var(--transition-fast);
}
.featured-cat-card:hover .fcc-link {
  color: var(--color-primary);
}
.featured-cat-card .fcc-link i {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-gold);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

/* ============================================
   TRUST BADGES - Porto Style
   ============================================ */
.trust-badge {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 0;
}
.trust-badge .tb-icon,
.trust-badge .trust-badge-icon {
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.25rem;
  flex-shrink: 0;
}
.trust-badge .tb-title,
.trust-badge strong {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  display: block;
}
.trust-badge .tb-desc,
.trust-badge span:not(strong) {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ============================================
   PROMO BANNERS - Porto Style
   ============================================ */
.promo-banner {
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition);
}
.promo-banner:hover {
  transform: translateY(-2px);
}
.promo-banner h3 {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}
.promo-banner .pb-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
}

/* ============================================
   SECTION HEADERS - Porto Style
   ============================================ */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  position: relative;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-primary);
}
.section-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: color var(--transition-fast);
}
.section-link:hover {
  color: var(--color-primary-hover);
}

/* Section divider line (Porto style) */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}

/* ============================================
   FEATURED OFFER BOX (Porto sidebar style)
   ============================================ */
.featured-offer-box {
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
}
.featured-offer-box h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}
.featured-offer-box .fo-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

/* ============================================
   PAGE CONTAINER
   ============================================ */
.page-container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}
@media (min-width: 640px) {
  .page-container { padding-left: 1.5rem; padding-right: 1.5rem; }
}
@media (min-width: 1024px) {
  .page-container { padding-left: 2rem; padding-right: 2rem; }
}

/* ============================================
   PRODUCT GRID - Responsive
   ============================================ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
@media (min-width: 480px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 768px) {
  .product-grid { grid-template-columns: repeat(4, 1fr); gap: 1rem; }
}
@media (min-width: 1024px) {
  .product-grid { grid-template-columns: repeat(5, 1fr); }
}

/* ============================================
   MOBILE BOTTOM NAVIGATION
   ============================================ */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 40;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  height: 60px;
  padding-bottom: env(safe-area-inset-bottom);
  box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}
.dark .bottom-nav {
  box-shadow: 0 -2px 10px rgba(0,0,0,0.3);
}
@media (max-width: 767px) {
  .bottom-nav { display: flex; }
  body { padding-bottom: calc(60px + env(safe-area-inset-bottom)); }
  #scroll-to-top { bottom: calc(4.5rem + env(safe-area-inset-bottom)); }
}
.bottom-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.125rem;
  font-size: 0.625rem;
  color: var(--color-text-muted);
  position: relative;
  -webkit-tap-highlight-color: transparent;
  transition: color var(--transition-fast);
  min-height: 44px;
}
.bottom-nav-item i { font-size: 1.25rem; line-height: 1; }
.bottom-nav-item.active { color: var(--color-primary); }
.bottom-nav-item:active { color: var(--color-primary); }
.bottom-nav-badge {
  position: absolute;
  top: 4px;
  right: calc(50% - 18px);
  background: var(--color-accent);
  color: white;
  font-size: 0.625rem;
  font-weight: 700;
  min-width: 16px;
  height: 16px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

/* ============================================
   MOBILE MENU OVERLAY
   ============================================ */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  visibility: hidden;
  opacity: 0;
  transition: all var(--transition-slow);
  background: rgba(0,0,0,0.5);
}
.mobile-menu-overlay.open {
  visibility: visible;
  opacity: 1;
}
.mobile-menu-panel {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 85%;
  max-width: 320px;
  background: var(--color-surface);
  padding: 1.25rem;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
  box-shadow: var(--shadow-xl);
}
.mobile-menu-overlay.open .mobile-menu-panel {
  transform: translateX(0);
}

/* ============================================
   CAROUSEL - Bootstrap 5 Compatibility + Porto Style
   ============================================ */
.carousel { position: relative; border-radius: var(--radius-lg); overflow: hidden; }
.carousel-inner { position: relative; width: 100%; overflow: hidden; }
.carousel-item {
  position: relative;
  display: none;
  float: left;
  width: 100%;
  margin-right: -100%;
  backface-visibility: hidden;
  transition: transform 0.6s ease-in-out;
}
.carousel-item.active,
.carousel-item-next,
.carousel-item-prev {
  display: block;
}
.carousel-item-next:not(.carousel-item-start),
.active.carousel-item-end {
  transform: translateX(100%);
}
.carousel-item-prev:not(.carousel-item-end),
.active.carousel-item-start {
  transform: translateX(-100%);
}
/* Carousel fade (optional) */
.carousel-fade .carousel-item { opacity: 0; transition: opacity 0.6s ease; transform: none; }
.carousel-fade .carousel-item.active,
.carousel-fade .carousel-item-next.carousel-item-start,
.carousel-fade .carousel-item-prev.carousel-item-end { opacity: 1; }
.carousel-fade .active.carousel-item-start,
.carousel-fade .active.carousel-item-end { opacity: 0; }

/* Carousel controls */
.carousel-control-prev, .carousel-control-next {
  position: absolute;
  top: 0; bottom: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 15%;
  padding: 0;
  color: #fff;
  text-align: center;
  background: none;
  border: 0;
  opacity: 0.5;
  transition: opacity 0.15s ease;
  cursor: pointer;
}
.carousel-control-prev { left: 0; }
.carousel-control-next { right: 0; }
.carousel-control-prev:hover, .carousel-control-next:hover { opacity: 0.9; }
.carousel-control-prev-icon, .carousel-control-next-icon {
  display: inline-block;
  width: 2rem; height: 2rem;
  background-repeat: no-repeat;
  background-position: 50%;
  background-size: 100% 100%;
}
.carousel-control-prev-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23fff'%3e%3cpath d='M11.354 1.646a.5.5 0 0 1 0 .708L5.707 8l5.647 5.646a.5.5 0 0 1-.708.708l-6-6a.5.5 0 0 1 0-.708l6-6a.5.5 0 0 1 .708 0z'/%3e%3c/svg%3e");
}
.carousel-control-next-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23fff'%3e%3cpath d='M4.646 1.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 0 .708l-6 6a.5.5 0 0 1-.708-.708L10.293 8 4.646 2.354a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}

/* Carousel indicators */
.carousel-indicators {
  position: absolute;
  right: 0; bottom: 0; left: 0;
  z-index: 2;
  display: flex;
  justify-content: center;
  padding: 0;
  margin-right: 15%; margin-bottom: 1rem; margin-left: 15%;
  list-style: none;
}
.carousel-indicators [data-bs-target] {
  width: 8px; height: 8px;
  border-radius: 50%;
  border: none;
  opacity: 0.5;
  box-sizing: content-box;
  flex: 0 1 auto;
  padding: 0;
  margin-right: 3px; margin-left: 3px;
  text-indent: -999px;
  cursor: pointer;
  background-color: #fff;
  background-clip: padding-box;
  transition: opacity 0.6s ease;
}
.carousel-indicators .active {
  opacity: 1;
  background: var(--color-primary);
  width: 24px;
  border-radius: 999px;
}
.visually-hidden { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }
#carouselExample, #carouselExample .carousel-inner,
#carouselExample .carousel-item, #carouselExample .carousel-item img {
  max-height: 420px;
}
#carouselExample .carousel-item img { object-fit: cover; width: 100%; }
@media (max-width: 1024px) {
  #carouselExample, #carouselExample .carousel-inner,
  #carouselExample .carousel-item, #carouselExample .carousel-item img {
    max-height: 320px;
  }
}
@media (max-width: 767px) {
  #carouselExample, #carouselExample .carousel-inner,
  #carouselExample .carousel-item, #carouselExample .carousel-item img {
    max-height: 220px;
  }
}

/* ============================================
   FLASH SALE
   ============================================ */
.flash-sale-section .flash-sale-container {
  background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 50%, #fecdd3 100%);
}
.dark .flash-sale-section .flash-sale-container {
  background: linear-gradient(135deg, rgba(225,29,72,0.1) 0%, rgba(225,29,72,0.05) 100%);
}

/* ============================================
   FILTER DRAWER (Mobile)
   ============================================ */
#filter-drawer-overlay.open {
  visibility: visible !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}

/* ============================================
   STICKY CART BAR (Mobile Product Detail)
   ============================================ */
.sticky-cart-bar {
  display: none;
  position: fixed;
  bottom: 60px; /* above bottom nav */
  left: 0; right: 0;
  z-index: 35;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
}
@media (max-width: 767px) {
  .sticky-cart-bar { display: flex; align-items: center; gap: 0.75rem; }
}

/* ============================================
   NEWSLETTER BAR (Porto Gold)
   ============================================ */
.newsletter-bar {
  background: var(--color-gold);
  color: #222;
  padding: 1.5rem 0;
}
.dark .newsletter-bar {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}
.newsletter-bar h4 { font-size: 1.125rem; font-weight: 700; }
.newsletter-bar p { font-size: 0.8125rem; opacity: 0.8; }
.newsletter-bar .nl-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius) 0 0 var(--radius);
  font-size: 0.875rem;
  outline: none;
  background: white;
  color: #222;
}
.newsletter-bar .nl-btn {
  padding: 0.75rem 1.5rem;
  background: #222;
  color: white;
  border: none;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}
.newsletter-bar .nl-btn:hover { background: #333; }

/* ============================================
   FOOTER - Porto Style (Dark)
   ============================================ */
.footer-main {
  background: #222529;
  color: #B2B4B8;
  padding: 3rem 0 1.5rem;
}
.dark .footer-main {
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
}
.footer-main h5 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.dark .footer-main h5 { color: var(--color-text); }
.footer-main a {
  color: #B2B4B8;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}
.dark .footer-main a { color: var(--color-text-secondary); }
.footer-main a:hover { color: #FFFFFF; }
.dark .footer-main a:hover { color: var(--color-text); }
.footer-heading {
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.dark .footer-heading { color: var(--color-text); }
.footer-link {
  color: #999;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
  display: block;
  padding: 0.125rem 0;
}
.footer-link:hover { color: #FFFFFF; }
.dark .footer-link { color: var(--color-text-muted); }
.dark .footer-link:hover { color: var(--color-text); }
.footer-main .footer-contact-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 0.25rem;
}
.dark .footer-main .footer-contact-label { color: var(--color-text); }
.footer-bottom {
  background: #1C1E22;
  color: #7A7D82;
  padding: 1rem 0;
  font-size: 0.8125rem;
}
.dark .footer-bottom {
  background: var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

/* ============================================
   COOKIE CONSENT
   ============================================ */
.cookie-consent-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 9999;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
  padding: 1rem;
  transform: translateY(100%);
  transition: transform 0.4s ease;
}
.cookie-consent-bar.show { transform: translateY(0); }
.cookie-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.cookie-modal-overlay.show { opacity: 1; visibility: visible; }
.cookie-modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 95%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

/* ============================================
   SCROLL TO TOP
   ============================================ */
#scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  z-index: 30;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  font-size: 1.25rem;
}
#scroll-to-top:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
}
#scroll-to-top.show { display: flex; }

/* ============================================
   MODAL (Bootstrap 5 compatibility — no BS CSS loaded)
   ============================================ */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 1055;
  display: none;
  overflow-x: hidden;
  overflow-y: auto;
  outline: 0;
  /* Bootstrap JS sets display:block when showing */
}
.modal[style*="display: block"] {
  display: block !important;
}
.modal.fade .modal-dialog {
  transition: transform 0.3s ease-out, opacity 0.3s ease;
  transform: translateY(-30px);
  opacity: 0;
}
.modal.show .modal-dialog {
  transform: none;
  opacity: 1;
}
.modal.show {
  display: block;
}
.modal-dialog {
  position: relative;
  width: auto;
  margin: 1.75rem auto;
  max-width: 500px;
  pointer-events: none;
}
.modal-dialog-centered {
  display: flex;
  align-items: center;
  min-height: calc(100% - 3.5rem);
}
.modal-lg { max-width: 800px; }
.modal-sm { max-width: 300px; }
.modal-xl { max-width: 1140px; }
.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  pointer-events: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  box-shadow: var(--shadow-xl);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
}
.modal-header .btn-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0.25rem;
  line-height: 1;
}
.modal-header .btn-close::before {
  content: '\00d7';
  font-size: 1.5rem;
}
.modal-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
}
.modal-body {
  position: relative;
  flex: 1 1 auto;
  padding: 1.25rem;
}
.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  border-top: 1px solid var(--color-border);
  padding: 0.75rem 1.25rem;
}
.modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 1050;
  background-color: rgba(0,0,0,0.5);
}
.modal-backdrop.fade { opacity: 0; transition: opacity 0.15s linear; }
.modal-backdrop.show { opacity: 1; }
@media (max-width: 575.98px) {
  .modal-dialog { margin: 0.5rem; max-width: calc(100% - 1rem); }
}

/* ============================================
   RESPONSIVE HEADER
   ============================================ */
@media (max-width: 767px) {
  .header-topbar { display: none; }
  .header-searchbar { height: auto; padding: 0.75rem 0; }
  .search-input-group { height: 42px; }
  .search-input-group .search-cat-select { display: none; }
  .header-nav { height: 44px; }
  :root {
    --header-total-height: 116px;
  }
  .section-title { font-size: 1.125rem; }
  .sticky-cart-bar { display: flex; }
}

@media (max-width: 1024px) {
  .search-input-group .search-cat-select { min-width: 100px; }
}

/* ============================================
   BOOTSTRAP UTILITY COMPATIBILITY
   (for JS-generated dynamic HTML like modals, tooltips, etc.)
   ============================================ */
.bg-white { background-color: var(--color-surface) !important; }
.border { border: 1px solid var(--color-border) !important; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.text-muted { color: var(--color-text-muted) !important; }
.btn-close {
  filter: var(--color-text) == '#F0F3F6' ? invert(1) : none;
}
.dark .btn-close { filter: invert(1); }

/* Bootstrap display utilities (used by carousel captions etc.) */
.d-block { display: block !important; }
.d-none { display: none !important; }
.w-100 { width: 100% !important; }
@media (min-width: 768px) { .d-md-block { display: block !important; } }

/* ============================================
   UTILITY CLASSES
   ============================================ */
.line-clamp-1 { display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ============================================
   SMALL SCREEN BREAKPOINT (< 480px)
   Optimized for small phones (320px-479px)
   ============================================ */
@media (max-width: 479px) {
  /* Trust badges: single column */
  .trust-badge { flex-direction: column; text-align: center; gap: 0.5rem; }
  .trust-badge-icon { margin: 0 auto; }

  /* Newsletter bar: stack vertically */
  .newsletter-bar .flex.items-center.gap-3 { flex-direction: column; text-align: center; }
  .newsletter-bar form { flex-direction: column; width: 100%; }
  .newsletter-bar form input { width: 100%; }
  .newsletter-bar form button { width: 100%; }

  /* Footer: single column on very small */
  .footer-main .grid { grid-template-columns: 1fr !important; }

  /* Section titles smaller */
  .section-title { font-size: 1rem; }

  /* Reduce page padding */
  .max-w-7xl { padding-left: 0.75rem; padding-right: 0.75rem; }

  /* Product cards: reduce gap */
  .grid.grid-cols-2 { gap: 0.5rem; }

  /* Checkout step indicator: compress */
  .flex.items-center.justify-start.gap-2.text-sm span:not([style]) { display: none; }
}

/* ============================================
   TOUCH TARGET MINIMUM 44px (WCAG 2.1 AA)
   ============================================ */
@media (max-width: 767px) {
  /* Bottom nav items */
  .bottom-nav-item { min-height: 44px; min-width: 44px; }

  /* Mobile menu toggle */
  #mobile-menu-toggle { min-height: 44px; min-width: 44px; padding: 0.5rem 0.75rem; }

  /* Quantity buttons in cart */
  .quantity-minus-btn, .quantity-plus-btn { min-width: 44px; min-height: 44px; width: 44px; height: 44px; }
  .cart-quantity-input { height: 44px; }

  /* Remove button in cart */
  .remove-from-cart-btn { min-width: 44px; min-height: 44px; width: 44px; height: 44px; }

  /* Filter close/apply buttons */
  #filter-drawer-close { min-width: 44px; min-height: 44px; }

  /* Option buttons (product details) */
  .option-btn { min-height: 44px; }

  /* Selection icon (cart checkbox area) */
  .selection-icon { min-width: 44px; min-height: 44px; display: flex; align-items: center; justify-content: center; }

  /* Cookie consent buttons */
  #cookie-settings-btn, #accept-all-cookies-btn { min-height: 44px; }

  /* Scroll to top button */
  #scroll-to-top { min-width: 44px; min-height: 44px; width: 44px; height: 44px; }
}

/* ============================================
   Z-INDEX STACKING ORDER (mobile)
   bottom-nav: 40, sticky-cart-bar: 42, scroll-to-top: 45
   mega-menu: 55, modal: 1055, cookie: 9998
   ============================================ */
@media (max-width: 767px) {
  .sticky-cart-bar { z-index: 42 !important; }
  #scroll-to-top { z-index: 45 !important; }
}