/* ============================================
   Dermiva — Design Tokens
   ============================================ */
:root {
  --color-primary: #4D7F71;
  --color-primary-dark: #3d6659;
  --color-text: #3A3D3F;
  --color-text-muted: #54555A;
  --color-text-body: #434447;
  --color-bg: #FCFDFD;
  --color-bg-alt: #f4f7f5;
  --color-sage: #A5BEAE;
  --color-sage-light: #d4e2d9;
  --color-white: #ffffff;
  --color-border: #e8ece9;

  --font-sans: 'Open Sans', system-ui, -apple-system, sans-serif;
  --font-serif: 'Cormorant Garamond', Georgia, serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(58, 61, 63, 0.06);
  --shadow-md: 0 4px 20px rgba(58, 61, 63, 0.08);
  --shadow-lg: 0 8px 40px rgba(58, 61, 63, 0.1);

  --transition: 0.25s ease;
  --header-height: 72px;
}

/* ============================================
   Reset & Base
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================
   Utilities
   ============================================ */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.section {
  padding: var(--space-2xl) 0;
}

.section__header--center {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Placeholder boxes */
.placeholder-box {
  background: linear-gradient(135deg, #e8ece9 0%, #d4dbd7 100%);
  border-radius: var(--radius-md);
  width: 100%;
  height: 100%;
}

.placeholder-box--sm {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
}

.placeholder-box--icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
}

.placeholder-box--story {
  width: 100%;
  height: 100%;
  min-height: 200px;
}

.placeholder-box--contact {
  width: 100%;
  height: 100%;
  min-height: 320px;
  border-radius: var(--radius-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

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

/* ============================================
   Header
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(252, 253, 253, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.header--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.logo--footer {
  font-size: 1.25rem;
}

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

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__link--cta {
  padding: 0.5rem 1.25rem;
  background: var(--color-primary);
  color: var(--color-white) !important;
  border-radius: var(--radius-full);
}

.nav__link--cta::after {
  display: none;
}

.nav__link--cta:hover {
  background: var(--color-primary-dark);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle--open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle--open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle--open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  padding-top: calc(var(--header-height) + var(--space-xl));
  padding-bottom: var(--space-2xl);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero__content {
  max-width: 520px;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.15;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.hero__tagline {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  letter-spacing: 0.01em;
}

.hero__text {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero__image-wrap {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4/5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--color-bg-alt);
}

.hero__badge {
  position: absolute;
  bottom: 2rem;
  left: -1rem;
  background: var(--color-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero__badge-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

.hero__badge-value {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-primary);
}

/* ============================================
   Product
   ============================================ */
.product {
  background: var(--color-white);
}

.product__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.product__gallery {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.product__image-main {
  aspect-ratio: 5/6;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-alt);
}

.product__image-main img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-md);
}

.product__thumbs {
  display: flex;
  gap: var(--space-xs);
}

.product__thumb {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color var(--transition);
  padding: 0;
}

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

.product__thumb img,
.product__thumb .placeholder-box {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--color-bg-alt);
}

.product__pricing {
  margin-bottom: var(--space-md);
}

.product__price {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.product__promo {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.product__promo strong {
  color: var(--color-text);
  font-weight: 600;
}

.product__desc {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.75;
}

.product__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.product__features li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.95rem;
}

.product__benefits {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.product__benefits-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.product__benefits-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm) var(--space-lg);
}

.product__benefits-list li {
  font-size: 0.9rem;
  color: var(--color-text-body);
  padding-left: 1.25rem;
  position: relative;
}

.product__benefits-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-sage);
}

/* ============================================
   Ingredients
   ============================================ */
.ingredients {
  background: var(--color-bg-alt);
}

.ingredients__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.ingredients__content {
  max-width: 560px;
}

.ingredients__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.ingredient-card {
  background: var(--color-white);
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}

.ingredient-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.ingredient-card__icon {
  margin-bottom: var(--space-md);
}

.ingredient-card__dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-sage-light);
}

.ingredient-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.ingredient-card__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================
   Brand Story
   ============================================ */
.story__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.story__image-stack {
  position: relative;
  max-width: 460px;
  margin: 0 auto;
}

.story__image--main {
  width: 100%;
  aspect-ratio: 5/6;
  object-fit: contain;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-md);
}

.story__image--accent {
  position: absolute;
  bottom: -2rem;
  right: -2rem;
  width: 45%;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 4px solid var(--color-bg);
  box-shadow: var(--shadow-md);
}

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

.story__text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.75;
}

.story__stats {
  display: flex;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.story__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.story__stat-value {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  color: var(--color-primary);
}

.story__stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  background: var(--color-white);
}

.faq__inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-xl);
  align-items: start;
}

.faq__header {
  position: sticky;
  top: calc(var(--header-height) + var(--space-md));
}

.faq__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq__item[open] {
  border-color: var(--color-sage);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-md);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
}

.faq__icon::before,
.faq__icon::after {
  content: '';
  position: absolute;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition);
}

.faq__icon::before {
  width: 12px;
  height: 2px;
  top: 9px;
  left: 4px;
}

.faq__icon::after {
  width: 2px;
  height: 12px;
  top: 4px;
  left: 9px;
}

.faq__item[open] .faq__icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.faq__answer {
  padding: 0 var(--space-md) var(--space-md);
}

.faq__answer p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================
   Contact
   ============================================ */
.contact {
  background: var(--color-bg-alt);
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  transition: color var(--transition);
}

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

.contact__link svg {
  flex-shrink: 0;
  color: var(--color-primary);
}

.contact__visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-alt);
}

.contact__visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  min-height: 320px;
  padding: var(--space-md);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-white);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer__tagline {
  font-size: 0.75rem;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__nav a {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .ingredients__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product__benefits-list {
    grid-template-columns: 1fr;
  }

  .faq__inner {
    grid-template-columns: 1fr;
  }

  .faq__header {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --space-2xl: 4rem;
    --header-height: 64px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    inset: 0;
    background: rgba(252, 253, 253, 0.98);
    backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    z-index: 105;
  }

  .nav--open {
    opacity: 1;
    visibility: visible;
  }

  .nav__list {
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
  }

  .nav__link {
    font-size: 1.1rem;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__content {
    max-width: 100%;
    order: 2;
  }

  .hero__visual {
    order: 1;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__badge {
    left: 1rem;
    bottom: 1rem;
  }

  .product__grid,
  .story__grid,
  .contact__inner {
    grid-template-columns: 1fr;
  }

  .story__visual {
    order: -1;
  }

  .story__image--accent {
    right: 0;
    bottom: -1.5rem;
  }

  .story__stats {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .ingredients__grid {
    grid-template-columns: 1fr;
  }

  .hero__actions {
    flex-direction: column;
    width: 100%;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .product__thumbs {
    justify-content: center;
  }
}