/* ============================================
   SKINCARE COMPARE — Layout (Header, Footer, Page layouts)
   ============================================ */

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-fast);
}

.header--compact {
  box-shadow: var(--shadow-xs);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  flex-shrink: 0;
  text-decoration: none;
}

.header__logo-mark {
  width: 32px;
  height: 32px;
  background: var(--color-accent-dark);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: var(--text-sm);
}

.header__nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .header__nav {
    display: flex;
  }
}

.header__nav-link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.header__nav-link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.header__nav-link.active {
  color: var(--color-accent-dark);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header__search-toggle {
  display: none;
}

@media (min-width: 768px) {
  .header__search-toggle {
    display: flex;
  }
}

.header__mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-primary);
}

@media (min-width: 768px) {
  .header__mobile-toggle {
    display: none;
  }
}

.header__mobile-toggle svg {
  width: 22px;
  height: 22px;
}

/* Mobile nav */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 900;
  visibility: hidden;
  opacity: 0;
  transition: all var(--transition-base);
}

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

.mobile-nav__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.3);
}

.mobile-nav__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  max-width: 85vw;
  height: 100%;
  background: var(--color-bg-card);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

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

.mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-nav__close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
}

.mobile-nav__close svg {
  width: 20px;
  height: 20px;
}

.mobile-nav__links {
  padding: var(--space-4) var(--space-5);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-nav__link:last-child {
  border-bottom: none;
}

/* --- Hero --- */
.hero {
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-warm) 100%);
}

@media (min-width: 768px) {
  .hero {
    padding: var(--space-24) 0 var(--space-16);
  }
}

.hero__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  max-width: 720px;
  margin: 0 auto var(--space-4);
}

@media (min-width: 768px) {
  .hero__title {
    font-size: var(--text-4xl);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: var(--text-5xl);
  }
}

.hero__subtitle {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto var(--space-8);
  line-height: var(--leading-relaxed);
}

@media (min-width: 768px) {
  .hero__subtitle {
    font-size: var(--text-lg);
  }
}

.hero__search {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-5);
}

.hero__examples {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero__example {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.hero__example:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

/* --- Value Row --- */
.value-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border-light);
}

@media (min-width: 640px) {
  .value-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

.value-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: center;
}

.value-item__icon {
  width: 40px;
  height: 40px;
  background: var(--color-accent-bg);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-dark);
  flex-shrink: 0;
}

.value-item__icon svg {
  width: 20px;
  height: 20px;
}

.value-item__text {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* --- Brands Grid --- */
.brands-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .brands-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .brands-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .brands-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* --- Concerns Grid --- */
.concerns-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .concerns-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .concerns-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* --- Products Grid --- */
.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .products-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Featured Grid --- */
.featured-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .featured-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .featured-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Trust Grid --- */
.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Search Page Layout --- */
.search-layout {
  display: flex;
  gap: var(--space-8);
  padding-top: var(--space-6);
}

.search-layout__sidebar {
  display: none;
  width: 260px;
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .search-layout__sidebar {
    display: block;
  }
}

.search-layout__main {
  flex: 1;
  min-width: 0;
}

/* Sidebar filters */
.sidebar-filters {
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
}

.filter-group {
  margin-bottom: var(--space-6);
}

.filter-group__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.filter-group__options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.filter-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.filter-option:hover {
  color: var(--color-text-primary);
}

.filter-option input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent-dark);
  cursor: pointer;
}

.filter-option__count {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Search toolbar */
.search-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.search-toolbar__count {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

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

.search-toolbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile filter button */
.mobile-filter-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

@media (min-width: 1024px) {
  .mobile-filter-btn {
    display: none;
  }
}

.mobile-filter-btn svg {
  width: 16px;
  height: 16px;
}

/* --- Product Detail Layout --- */
.product-detail-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding: var(--space-6) 0 var(--space-10);
}

@media (min-width: 768px) {
  .product-detail-hero {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}

.product-detail__image-area {
  background: var(--color-bg-warm);
  border-radius: var(--radius-lg);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
}

.product-detail__info {
  display: flex;
  flex-direction: column;
}

.product-detail__brand {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-2);
}

.product-detail__name {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-3);
}

@media (min-width: 768px) {
  .product-detail__name {
    font-size: var(--text-3xl);
  }
}

.product-detail__size {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.product-detail__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.product-detail__price-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.product-detail__price {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.product-detail__price-from {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.product-detail__unit-price {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

/* Product sections navigation */
.product-sections {
  padding-bottom: var(--space-16);
}

.product-section {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--color-border-light);
}

.product-section__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.product-section__title-icon {
  width: 32px;
  height: 32px;
  background: var(--color-accent-bg);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-dark);
}

.product-section__title-icon svg {
  width: 16px;
  height: 16px;
}

/* Alternatives grid */
.alternatives-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .alternatives-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .alternatives-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Ingredient Glossary Layout --- */
.glossary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .glossary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .glossary-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.glossary-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--transition-base);
  cursor: pointer;
}

.glossary-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-dark);
}

.glossary-card__name {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.glossary-card__function {
  font-size: var(--text-sm);
  color: var(--color-accent-dark);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.glossary-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

.glossary-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

/* Alphabet filter */
.alphabet-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  justify-content: center;
  padding: var(--space-4) 0;
}

.alphabet-filter__letter {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.alphabet-filter__letter:hover,
.alphabet-filter__letter.active {
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-warm);
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-16);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 2fr repeat(4, 1fr);
  }
}

.footer__brand {
  grid-column: 1 / -1;
}

@media (min-width: 1024px) {
  .footer__brand {
    grid-column: 1;
  }
}

.footer__brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer__brand-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 280px;
}

.footer__col-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-accent-dark);
}

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.footer__legal {
  display: flex;
  gap: var(--space-5);
}

.footer__legal a {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.footer__disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  line-height: var(--leading-relaxed);
  max-width: 720px;
  margin-top: var(--space-4);
}

/* --- Sticky Mobile CTA --- */
.sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-5);
  z-index: 400;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.06);
}

@media (max-width: 767px) {
  .sticky-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
  }
}

.sticky-cta__price {
  font-size: var(--text-lg);
  font-weight: 700;
}

.sticky-cta__label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* --- Ingredient Detail Page --- */
.ingredient-detail-header {
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.ingredient-detail-header__badge {
  margin-bottom: var(--space-4);
}

.ingredient-detail-header__name {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

@media (min-width: 768px) {
  .ingredient-detail-header__name {
    font-size: var(--text-4xl);
  }
}

.ingredient-detail-header__function {
  font-size: var(--text-lg);
  color: var(--color-accent-dark);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.ingredient-detail-header__desc {
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: var(--leading-relaxed);
}

.ingredient-info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  padding: var(--space-8) 0;
}

@media (min-width: 768px) {
  .ingredient-info-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.ingredient-info-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.ingredient-info-card__title {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-4);
}

.ingredient-info-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.ingredient-info-card__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.ingredient-info-card__item-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 1px;
  color: var(--color-accent);
}

.ingredient-info-card__item-icon svg {
  width: 16px;
  height: 16px;
}