/**
 * TuMart - Hệ thống giao diện thương mại điện tử (CSS Thuần BEM)
 * css/style.css
 */

/* ==========================================================================
   1. RESET & DESIGN TOKENS
   ========================================================================== */
:root {
  --color-primary: #ff6a00;
  --color-primary-dark: #e55a00;
  --color-primary-light: #fff1e6;
  --color-secondary: #1a1a2e;
  --color-secondary-light: #2c2c47;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-warning: #f59e0b;
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-text: #222222;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
  --container: 1200px;
  --font-family: 'Be Vietnam Pro', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
  transition: var(--transition);
}

input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  color: inherit;
}

ul, ol {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   2. LAYOUT & UTILITIES
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.section {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.section__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  gap: 1rem;
}

.section__title {
  font-size: clamp(1.25rem, 2vw + 0.8rem, 1.75rem);
  font-weight: 700;
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section__title i {
  color: var(--color-primary);
}

.section__link {
  font-size: 0.9375rem;
  color: var(--color-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.section__link:hover {
  text-decoration: underline;
  transform: translateX(3px);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
}

.badge--primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.badge--danger {
  background-color: #fee2e2;
  color: var(--color-danger);
}

.badge--success {
  background-color: #dcfce7;
  color: var(--color-success);
}

/* ==========================================================================
   3. BUTTONS (BEM: .btn)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  min-height: 44px;
  min-width: 44px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(255, 106, 0, 0.3);
}

.btn--secondary {
  background-color: var(--color-secondary);
  color: #ffffff;
}

.btn--secondary:hover {
  background-color: var(--color-secondary-light);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary-light);
}

.btn--outline-gray {
  background-color: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--outline-gray:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
}

.btn--ghost:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.btn--lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.0625rem;
  min-height: 48px;
}

.btn--sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  min-height: 36px;
}

.btn--block {
  width: 100%;
}

.btn--pill {
  border-radius: var(--radius-pill);
}

.btn--icon {
  padding: 0.5rem;
  border-radius: var(--radius-pill);
}

/* ==========================================================================
   4. TOP BAR & HEADER (Sticky)
   ========================================================================== */
.top-bar {
  background-color: var(--color-secondary);
  color: #e5e7eb;
  font-size: 0.8125rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.top-bar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.top-bar__info {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.top-bar__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.top-bar__item i {
  color: var(--color-primary);
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease;
}

.header__main {
  padding: 0.875rem 0;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--color-secondary);
  letter-spacing: -0.5px;
}

.header__brand-logo {
  color: var(--color-primary);
  font-size: 1.75rem;
}

.header__brand span {
  color: var(--color-primary);
}

/* Search Box with Autocomplete */
.header__search {
  flex: 1;
  max-width: 580px;
  position: relative;
}

.search-form {
  display: flex;
  align-items: center;
  background-color: #f3f4f6;
  border: 1.5px solid transparent;
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.375rem 0.25rem 1.25rem;
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--color-primary);
  background-color: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(255, 106, 0, 0.15);
}

.search-form__input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  padding: 0.4rem 0;
  font-size: 0.9375rem;
}

.search-form__submit {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-form__submit:hover {
  background-color: var(--color-primary-dark);
}

.search-suggest {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  z-index: 110;
  overflow: hidden;
  display: none;
}

.search-suggest--active {
  display: block;
}

.search-suggest__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.search-suggest__item:last-child {
  border-bottom: none;
}

.search-suggest__item:hover {
  background-color: #f9fafb;
}

.search-suggest__img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.search-suggest__name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-suggest__price {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* Header Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  position: relative;
  min-height: 44px;
}

.action-btn:hover {
  background-color: #f3f4f6;
  color: var(--color-primary);
}

.action-btn__icon-wrapper {
  position: relative;
  font-size: 1.25rem;
}

.action-btn__badge {
  position: absolute;
  top: -8px;
  right: -10px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
  min-width: 18px;
  text-align: center;
}

.action-btn__text {
  display: none;
  flex-direction: column;
  text-align: left;
  line-height: 1.2;
}

.action-btn__sub {
  font-size: 0.75rem;
  color: var(--color-muted);
}

.action-btn__label {
  font-size: 0.875rem;
  font-weight: 600;
}

/* Category Navigation Bar */
.header__nav {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 0.25rem 0;
}

.nav-list::-webkit-scrollbar {
  display: none;
}

.nav-item {
  white-space: nowrap;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-pill);
  min-height: 40px;
}

.nav-link:hover,
.nav-link.nav-link--active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  font-weight: 600;
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: 1.25rem;
  border-radius: var(--radius-sm);
}

/* Mobile Drawer */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-overlay--active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 290px;
  background-color: var(--color-surface);
  z-index: 201;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.mobile-drawer--active {
  transform: translateX(0);
}

.mobile-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.mobile-drawer__body {
  padding: 1rem 0;
  overflow-y: auto;
  flex: 1;
}

.mobile-drawer__nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

.mobile-drawer__nav-link:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* ==========================================================================
   5. HERO BANNER SLIDER
   ========================================================================== */
.hero {
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.slider {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-secondary);
  height: 280px;
}

.slider__track {
  display: flex;
  height: 100%;
  transition: transform 0.5s ease;
}

.slider__slide {
  min-width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
}

.slider__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.65);
}

.slider__content {
  position: relative;
  z-index: 2;
  padding: 2rem;
  max-width: 550px;
  color: #ffffff;
}

.slider__tag {
  display: inline-block;
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.slider__title {
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.slider__subtitle {
  font-size: 0.9375rem;
  opacity: 0.9;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.slider__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.85);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 5;
  box-shadow: var(--shadow-sm);
}

.slider__arrow:hover {
  background-color: #ffffff;
  color: var(--color-primary);
}

.slider__arrow--prev {
  left: 12px;
}

.slider__arrow--next {
  right: 12px;
}

.slider__dots {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 5;
}

.slider__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: var(--transition);
}

.slider__dot--active {
  width: 24px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}

.hero__sub-banners {
  display: none;
  flex-direction: column;
  gap: 1rem;
}

.sub-banner {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  height: 180px;
  background-color: #e5e7eb;
}

.sub-banner__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.sub-banner:hover .sub-banner__img {
  transform: scale(1.04);
}

.sub-banner__content {
  position: absolute;
  inset: 0;
  padding: 1.25rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent 70%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: #ffffff;
}

.sub-banner__title {
  font-size: 1rem;
  font-weight: 700;
}

.sub-banner__desc {
  font-size: 0.8125rem;
  opacity: 0.85;
}

/* ==========================================================================
   6. CATEGORIES GRID (Lưới danh mục icon tròn)
   ========================================================================== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.category-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 1rem 0.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.category-card__icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  transition: var(--transition);
}

.category-card:hover .category-card__icon-wrap {
  transform: scale(1.1);
}

.category-card__name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

/* ==========================================================================
   7. FLASH SALE SECTION
   ========================================================================== */
.flash-sale {
  background: linear-gradient(135deg, #fff5eb 0%, #ffe9d9 100%);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid #ffd6b8;
  margin-bottom: 2rem;
}

.flash-sale__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.flash-sale__title-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.flash-sale__title {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.timer {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.timer__box {
  background-color: var(--color-secondary);
  color: #ffffff;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.875rem;
  min-width: 32px;
  text-align: center;
}

.timer__colon {
  font-weight: 700;
  color: var(--color-secondary);
}

.flash-sale__scroll {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.75rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.flash-sale__scroll::-webkit-scrollbar {
  height: 6px;
}

.flash-sale__scroll::-webkit-scrollbar-thumb {
  background: #fbcfe8;
  border-radius: var(--radius-pill);
}

.flash-sale__item {
  min-width: 200px;
  max-width: 220px;
  scroll-snap-align: start;
}

.flash-sale__progress {
  width: 100%;
  background-color: #fed7aa;
  height: 14px;
  border-radius: var(--radius-pill);
  position: relative;
  overflow: hidden;
  margin-top: 0.5rem;
}

.flash-sale__progress-bar {
  background: linear-gradient(90deg, #ff6a00, #dc2626);
  height: 100%;
  border-radius: var(--radius-pill);
}

.flash-sale__progress-text {
  position: absolute;
  inset: 0;
  font-size: 0.6875rem;
  color: #ffffff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   8. PRODUCT CARD (BEM: .product-card)
   ========================================================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.875rem;
}

.product-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #ffd2b3;
}

.product-card__thumb {
  position: relative;
  padding-top: 100%;
  overflow: hidden;
  background-color: #f9fafb;
}

.product-card__img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.product-card:hover .product-card__img {
  transform: scale(1.06);
}

.product-card__badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  z-index: 2;
}

.product-card__wishlist {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--color-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  z-index: 2;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.product-card__wishlist:hover,
.product-card__wishlist--active {
  color: #ef4444;
  background-color: #ffffff;
}

.product-card__body {
  padding: 0.875rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.product-card__category {
  font-size: 0.6875rem;
  color: var(--color-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 0.25rem;
}

.product-card__title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  height: 2.8em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.product-card__title:hover {
  color: var(--color-primary);
}

.product-card__rating-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  margin-bottom: 0.5rem;
}

.product-card__stars {
  color: #fbbf24;
}

.product-card__sold {
  color: var(--color-muted);
}

.product-card__price-row {
  margin-top: auto;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.product-card__price {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
}

.product-card__old-price {
  font-size: 0.75rem;
  color: var(--color-muted);
  text-decoration: line-through;
}

.product-card__actions {
  display: flex;
  gap: 0.5rem;
}

/* ==========================================================================
   9. BRAND & STRIP BANNER
   ========================================================================== */
.strip-banner {
  background: linear-gradient(90deg, #1a1a2e 0%, #2b1d3d 100%);
  border-radius: var(--radius);
  padding: 2rem;
  color: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.strip-banner__content {
  position: relative;
  z-index: 2;
}

.strip-banner__title {
  font-size: clamp(1.25rem, 2.5vw, 1.85rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.brand-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  color: var(--color-secondary);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.brand-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Features Block 4 Cols */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.feature-box {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.feature-box__icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
}

.feature-box__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 0.15rem;
}

.feature-box__desc {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* Newsletter Box */
.newsletter {
  background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
  border-radius: var(--radius);
  padding: 2.25rem 1.5rem;
  text-align: center;
  border: 1px solid #fed7aa;
}

.newsletter__form {
  display: flex;
  max-width: 480px;
  margin: 1.25rem auto 0;
  flex-direction: column;
  gap: 0.5rem;
}

.newsletter__input {
  flex: 1;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  outline: none;
}

/* ==========================================================================
   10. BREADCRUMB
   ========================================================================== */
.breadcrumb {
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__item:hover a {
  color: var(--color-primary);
}

.breadcrumb__item--active {
  color: var(--color-text);
  font-weight: 600;
}

.breadcrumb__separator {
  font-size: 0.75rem;
  color: #9ca3af;
}

/* ==========================================================================
   11. FILTER & PRODUCT LISTING PAGE (san-pham.html)
   ========================================================================== */
.listing-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}

.filter-sidebar {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.filter-group {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
}

.filter-group:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.filter-group__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 0.875rem;
}

.filter-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.filter-checkbox {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  color: var(--color-text);
  cursor: pointer;
}

.filter-checkbox input[type="checkbox"] {
  width: 17px;
  height: 17px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.price-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.price-input {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

/* Toolbar & View Modes */
.listing-toolbar {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 0.875rem 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.listing-toolbar__count {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.listing-toolbar__count strong {
  color: var(--color-text);
}

.listing-toolbar__controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sort-select {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
}

.view-modes {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.view-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

.view-btn--active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* List view mode */
.product-grid--list {
  grid-template-columns: 1fr;
}

.product-grid--list .product-card {
  flex-direction: row;
}

.product-grid--list .product-card__thumb {
  width: 220px;
  min-width: 220px;
  padding-top: 0;
  height: 220px;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.pagination__btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  font-weight: 600;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pagination__btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination__btn--active {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

/* Empty State */
.empty-state {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 3rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.empty-state__icon {
  font-size: 3.5rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.empty-state__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state__desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  max-width: 420px;
  margin: 0 auto 1.5rem;
}

/* ==========================================================================
   12. PRODUCT DETAIL PAGE (chi-tiet.html)
   ========================================================================== */
.product-detail {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

/* Gallery & Zoom */
.gallery {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.gallery__main {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: #f9fafb;
  border: 1px solid var(--color-border);
  cursor: crosshair;
}

.gallery__main-img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  transition: transform 0.2s ease;
}

.gallery__thumbs {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.gallery__thumb {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  overflow: hidden;
  cursor: pointer;
  flex-shrink: 0;
}

.gallery__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gallery__thumb--active {
  border-color: var(--color-primary);
}

/* Detail Info */
.detail-info__brand {
  font-size: 0.8125rem;
  color: var(--color-primary);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.detail-info__title {
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  font-weight: 700;
  color: var(--color-secondary);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

.detail-info__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
}

.detail-info__price-box {
  background-color: var(--color-bg);
  padding: 1.25rem;
  border-radius: var(--radius);
  display: flex;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.detail-info__price {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--color-primary);
}

.detail-info__old-price {
  font-size: 1.125rem;
  color: var(--color-muted);
  text-decoration: line-through;
}

.detail-info__discount {
  background-color: #fee2e2;
  color: var(--color-danger);
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.qty-picker {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}

.qty-picker__btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-text);
}

.qty-picker__btn:hover {
  background-color: #f3f4f6;
  color: var(--color-primary);
}

.qty-picker__input {
  width: 50px;
  height: 38px;
  text-align: center;
  border: none;
  border-left: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  font-weight: 700;
  font-size: 0.9375rem;
  outline: none;
}

.detail-info__actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

/* Bottom Sticky Buy Bar (Mobile) */
.mobile-buy-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.1);
  padding: 0.625rem 1rem;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Product Tabs (Mô tả, Thông số, Đánh giá) */
.product-tabs {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
  margin-bottom: 2rem;
}

.tabs-nav {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  background-color: #f9fafb;
}

.tab-btn {
  padding: 1rem 1.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-muted);
  border-bottom: 2px solid transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--color-primary);
}

.tab-btn--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background-color: var(--color-surface);
}

.tab-pane {
  padding: 1.5rem;
  display: none;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.tab-pane--active {
  display: block;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table tr:nth-child(even) {
  background-color: #f9fafb;
}

.specs-table td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
}

.specs-table td:first-child {
  font-weight: 600;
  width: 35%;
  color: var(--color-secondary);
}

/* ==========================================================================
   13. CART & CHECKOUT PAGES (gio-hang.html, thanh-toan.html)
   ========================================================================== */
.cart-layout,
.checkout-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}

.cart-table-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.cart-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 1rem;
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
  align-items: center;
}

.cart-item:last-child {
  border-bottom: none;
}

.cart-item__img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.cart-item__details {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.cart-item__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.cart-item__price {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary);
}

.order-summary {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.order-summary__row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.875rem;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.order-summary__row--total {
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  margin-top: 1rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-secondary);
}

.order-summary__total-val {
  color: var(--color-primary);
  font-size: 1.375rem;
}

.coupon-box {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.coupon-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  font-weight: 600;
}

/* Step Progress Indicator (thanh-toan.html) */
.checkout-steps {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.checkout-step {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-muted);
}

.checkout-step__num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #e5e7eb;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.checkout-step--active {
  color: var(--color-primary);
}

.checkout-step--active .checkout-step__num {
  background-color: var(--color-primary);
  color: #ffffff;
}

.checkout-step--completed {
  color: var(--color-success);
}

.checkout-step--completed .checkout-step__num {
  background-color: var(--color-success);
  color: #ffffff;
}

/* Payment Method Cards */
.payment-methods {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.payment-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

.payment-card:hover {
  border-color: var(--color-primary-light);
}

.payment-card--active {
  border-color: var(--color-primary);
  background-color: #fffaf5;
}

.payment-card input[type="radio"] {
  margin-top: 0.25rem;
  accent-color: var(--color-primary);
}

.payment-card__content {
  flex: 1;
}

.payment-card__title {
  font-weight: 600;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.payment-card__desc {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-top: 0.2rem;
}

.qr-box {
  background-color: #ffffff;
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--color-border);
  text-align: center;
  margin-top: 0.75rem;
  display: none;
}

.qr-box--show {
  display: block;
}

.qr-box img {
  width: 160px;
  height: 160px;
  margin: 0 auto 0.5rem;
}

/* Form Groups & Validation Feedback */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-secondary);
}

.form-label span {
  color: var(--color-danger);
}

.form-control {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 106, 0, 0.15);
}

.form-control--error {
  border-color: var(--color-danger);
}

.form-error {
  font-size: 0.75rem;
  color: var(--color-danger);
  margin-top: 0.25rem;
  display: block;
}

/* ==========================================================================
   14. AUTH PAGE (dang-nhap.html)
   ========================================================================== */
.auth-wrapper {
  max-width: 460px;
  margin: 2rem auto;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
}

.auth-tab {
  flex: 1;
  padding: 1rem;
  font-weight: 700;
  font-size: 1rem;
  text-align: center;
  background-color: #f9fafb;
  color: var(--color-muted);
}

.auth-tab--active {
  background-color: var(--color-surface);
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
}

.auth-body {
  padding: 1.75rem;
}

.input-password-wrapper {
  position: relative;
}

.input-password-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  cursor: pointer;
  padding: 4px;
}

.social-auth {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.social-auth__text {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
  position: relative;
}

.social-auth__buttons {
  display: flex;
  gap: 0.75rem;
}

.social-auth__btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  font-weight: 600;
}

.social-auth__btn:hover {
  background-color: #f3f4f6;
}

/* ==========================================================================
   15. CONTACT & FAQ (lien-he.html)
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.accordion-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.accordion-header {
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9375rem;
  background-color: var(--color-surface);
}

.accordion-header:hover {
  color: var(--color-primary);
}

.accordion-icon {
  transition: transform 0.3s ease;
}

.accordion-item--active .accordion-icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.accordion-content {
  padding: 0 1.25rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.6;
}

.accordion-item--active .accordion-content {
  padding: 0 1.25rem 1.25rem;
  max-height: 250px;
}

/* ==========================================================================
   16. FOOTER
   ========================================================================== */
.footer {
  background-color: var(--color-secondary);
  color: #cbd5e1;
  margin-top: 3rem;
  border-top: 3px solid var(--color-primary);
}

.footer__top {
  padding: 3rem 0 2rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.footer__col-title {
  color: #ffffff;
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer__col-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background-color: var(--color-primary);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.875rem;
}

.footer__link {
  color: #94a3b8;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.footer__link:hover {
  color: var(--color-primary);
  transform: translateX(3px);
}

.footer__payment-list {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.footer__payment-badge {
  background-color: #ffffff;
  color: var(--color-secondary);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.25rem 0;
  font-size: 0.8125rem;
  text-align: center;
  color: #94a3b8;
}

/* ==========================================================================
   17. TOAST NOTIFICATION & MODALS
   ========================================================================== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 380px;
  background-color: var(--color-surface);
  color: var(--color-text);
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-left: 4px solid var(--color-primary);
  animation: toastSlideIn 0.3s ease;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.toast--success {
  border-left-color: var(--color-success);
}

.toast--error {
  border-left-color: var(--color-danger);
}

.toast--warning {
  border-left-color: var(--color-warning);
}

.toast__icon {
  font-size: 1.125rem;
}

.toast--success .toast__icon {
  color: var(--color-success);
}

.toast--error .toast__icon {
  color: var(--color-danger);
}

.toast--warning .toast__icon {
  color: var(--color-warning);
}

@keyframes toastSlideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Modal Dialog */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay--show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  max-width: 500px;
  width: 100%;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform 0.3s ease;
  text-align: center;
}

.modal-overlay--show .modal {
  transform: translateY(0);
}

/* Back to Top Floating Button */
.back-to-top {
  position: fixed;
  bottom: 75px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  box-shadow: var(--shadow-md);
  z-index: 95;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.back-to-top--show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* Form Row Responsive (1 col mobile, 2 col desktop) */
.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 576px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

.checkout-step__divider {
  width: 32px;
  height: 2px;
  background-color: var(--color-border);
}

.checkout-step__divider--active {
  background-color: var(--color-success);
}

.filter-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin-bottom: 1rem;
}

@media (min-width: 992px) {
  .filter-toggle-btn {
    display: none;
  }
}

@media (max-width: 991px) {
  .filter-sidebar {
    display: none;
  }
  .filter-sidebar--open {
    display: block;
    animation: fadeIn 0.3s ease;
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 575px) {
  .checkout-steps {
    gap: 0.5rem;
  }
  .checkout-step span:not(.checkout-step__num) {
    font-size: 0.75rem;
  }
  .checkout-step__divider {
    width: 14px;
  }
  .top-bar__info {
    justify-content: center;
    width: 100%;
    text-align: center;
  }
  body[data-page="detail"] {
    padding-bottom: 60px;
  }
}

/* Tablet (576px - 991px) */
@media (min-width: 576px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .category-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .newsletter__form {
    flex-direction: row;
  }
  .newsletter__btn {
    width: auto;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .slider {
    height: 350px;
  }
}

/* Desktop (>= 992px) */
@media (min-width: 992px) {
  .hero__grid {
    grid-template-columns: 2fr 1fr;
  }
  .slider {
    height: 380px;
  }
  .hero__sub-banners {
    display: flex;
  }
  .category-grid {
    grid-template-columns: repeat(8, 1fr);
  }
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .listing-layout {
    grid-template-columns: 280px 1fr;
  }
  .product-detail {
    grid-template-columns: 480px 1fr;
  }
  .cart-layout {
    grid-template-columns: 1fr 380px;
  }
  .checkout-layout {
    grid-template-columns: 1fr 400px;
  }
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
  }
  .action-btn__text {
    display: flex;
  }
  .mobile-buy-bar {
    display: none;
  }
  .menu-toggle {
    display: none;
  }
  .back-to-top {
    bottom: 30px;
  }
}