:root {
  /* Colors — Peak Design monochrome */
  --color-carbon-ink: #1a211e;
  --color-paper-white: #ffffff;
  --color-true-black: #000000;
  --color-obsidian: #0c0c0c;
  --color-fog: #eef1f0;
  --color-mist: #e0e0e0;
  --color-graphite: #606562;
  --color-ash-border: #cccfcd;
  --color-slate: #363537;
  --color-pewter: #4e4e4e;
  --color-ember-red: #cc2e39;
  --color-accent-violet: #5b4cdb;

  /* Typography */
  --font-geist: 'Inter', ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: 'Playfair Display', ui-serif, Georgia, "Times New Roman", serif;
  --font-bryant: 'Oswald', ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Spacing */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-64: 64px;

  /* Radius */
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-3xl: 32px;
  --radius-full: 9999px;

  --page-max-width: 1440px;
  --section-gap: 80px;

  /* Product detail page tokens */
  --font-sans: var(--font-geist);
  --surface-1: var(--color-fog);
  --surface-2: var(--color-paper-white);
  --border: var(--color-mist);
  --border-strong: var(--color-ash-border);
  --text-primary: var(--color-carbon-ink);
  --text-secondary: var(--color-graphite);
  --text-muted: var(--color-graphite);
  --text-accent: var(--color-accent-violet);
  --text-success: #1a7a3e;
  --fill-primary: var(--color-carbon-ink);
  --on-primary: var(--color-paper-white);
  --bg-accent: #eeebfb;
  --radius: var(--radius-lg);
}

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

body {
  font-family: var(--font-geist);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-carbon-ink);
  background: var(--color-paper-white);
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  line-height: 1.1;
}

.eyebrow, .label-caps {
  font-family: var(--font-bryant);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.057em;
}

.wrap {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 40px;
}

/* Announcement bar */
.topbar {
  background: var(--color-true-black);
  color: var(--color-paper-white);
  text-align: center;
  padding: 8px 20px;
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.057em;
}

/* Nav */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 0 40px;
  height: 64px;
  background: var(--color-paper-white);
  border-bottom: 1px solid var(--color-mist);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 20px;
  color: var(--color-carbon-ink);
  flex-shrink: 0;
  white-space: nowrap;
}

.nav {
  display: flex;
  gap: 28px;
}
.nav a {
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.057em;
  color: var(--color-slate);
  transition: color 0.15s;
}
.nav a:hover { color: var(--color-carbon-ink); }

.search-field {
  flex: 1;
  max-width: 340px;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 12px;
  background: var(--color-fog);
  border: 1px solid var(--color-ash-border);
  border-radius: var(--radius-md);
}
.search-field svg { flex-shrink: 0; color: var(--color-graphite); }
.search-field input {
  border: none;
  background: transparent;
  outline: none;
  width: 100%;
  font-family: var(--font-geist);
  font-size: 14px;
  color: var(--color-carbon-ink);
}
.search-field input::placeholder { color: var(--color-graphite); }

.header-icons {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}
.icon-btn {
  border: none;
  background: none;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-carbon-ink);
  cursor: pointer;
  position: relative;
}
.icon-btn:hover { opacity: 0.7; }
.cart-count {
  position: absolute;
  top: 2px;
  right: 2px;
  background: var(--color-carbon-ink);
  color: white;
  font-family: var(--font-bryant);
  font-size: 10px;
  font-weight: 700;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Category filter bar */
.filter-bar {
  display: flex;
  gap: 8px;
  padding: 20px 40px;
  overflow-x: auto;
  border-bottom: 1px solid var(--color-mist);
}
.filter-chip {
  flex-shrink: 0;
  height: 40px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-full);
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.057em;
  border: 1px solid var(--color-ash-border);
  color: var(--color-slate);
  background: transparent;
  cursor: pointer;
}
.filter-chip.active {
  background: var(--color-carbon-ink);
  color: var(--color-paper-white);
  border-color: var(--color-carbon-ink);
}
/* Buttons — monochrome. Default styling is for light surfaces;
   dark-panel ancestors flip the polarity below. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 44px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.057em;
  cursor: pointer;
  transition: opacity 0.15s;
  border: none;
}
.btn:hover { opacity: 0.85; }

.btn-primary {
  background: var(--color-carbon-ink);
  color: var(--color-paper-white);
}
.btn-outline {
  background: transparent;
  color: var(--color-carbon-ink);
  border: 1px solid var(--color-carbon-ink);
}
.btn-ghost {
  background: transparent;
  color: var(--color-carbon-ink);
  padding: 0;
  height: auto;
  font-size: 14px;
}
.btn-ghost:hover { opacity: 1; text-decoration: underline; }

.hero-split-text .btn-primary,
.band-dark .btn-primary {
  background: var(--color-paper-white);
  color: var(--color-carbon-ink);
}
.hero-split-text .btn-outline,
.band-dark .btn-outline {
  background: transparent;
  color: var(--color-paper-white);
  border: 1px solid var(--color-paper-white);
}

/* Section rhythm */
.band {
  padding: var(--section-gap) 40px;
}
.band-dark {
  background: var(--color-obsidian);
  color: var(--color-paper-white);
}

.section-heading {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 48px;
  line-height: 1.1;
  color: var(--color-carbon-ink);
  margin-bottom: 40px;
}
.band-dark .section-heading { color: var(--color-paper-white); }

/* Hero split */
.hero-split {
  display: flex;
  min-height: 560px;
}
.hero-split-text {
  flex: 1;
  background: var(--color-obsidian);
  color: var(--color-paper-white);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 64px;
}
.hero-split-text .eyebrow {
  color: var(--color-paper-white);
  font-size: 14px;
  letter-spacing: 0.038em;
  margin-bottom: 12px;
}
.hero-split-text h1 {
  font-size: 48px;
  letter-spacing: -0.02em;
  line-height: 1.15;
  max-width: 560px;
  margin-bottom: 20px;
  color: var(--color-paper-white);
}
.hero-split-text p {
  font-family: var(--font-geist);
  font-size: 16px;
  line-height: 1.6;
  color: rgba(255,255,255,0.8);
  max-width: 480px;
  margin-bottom: 12px;
}
.hero-split-text p strong {
  color: var(--color-ember-red);
  font-weight: 700;
}
.hero-split-text p.hero-source {
  font-family: var(--font-geist);
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  max-width: 480px;
  margin-bottom: 32px;
}
.hero-split-buttons {
  display: flex;
  gap: 12px;
}
.hero-split-image {
  flex: 1;
  background: var(--color-fog);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.hero-split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.placeholder-label {
  font-family: var(--font-bryant);
  font-size: 14px;
  letter-spacing: 0.038em;
  text-transform: uppercase;
  color: var(--color-graphite);
  text-align: center;
}

/* Hero disclaimer bar */
.hero-disclaimer-bar {
  background: var(--color-fog);
  padding: 14px 20px;
  text-align: center;
}

.hero-disclaimer-bar p {
  font-family: var(--font-geist);
  font-size: 13px;
  color: var(--color-graphite);
  max-width: 720px;
  margin: 0 auto;
}

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.product-card { background: var(--color-paper-white); max-width: 180px; }

/* Bestsellers carousel */
.carousel-viewport {
  overflow: hidden;
  max-width: 660px;
}
.carousel-track.product-grid {
  display: flex;
  gap: 32px;
  width: max-content;
  animation: bestsellers-scroll 22s linear infinite;
}
.carousel-track.paused {
  animation-play-state: paused;
}
.carousel-track .product-card {
  flex: 0 0 180px;
}
@keyframes bestsellers-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.product-image {
  aspect-ratio: 1 / 1;
  background: var(--color-fog);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-lg);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  overflow: hidden;
}
.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}
.product-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--color-pewter);
  color: white;
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.038em;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}
.product-card h3 {
  font-family: var(--font-geist);
  font-style: normal;
  font-weight: 400;
  font-size: 16px;
  color: var(--color-carbon-ink);
}
.product-card h3 a:hover { text-decoration: underline; }
.product-brand {
  font-size: 14px;
  color: var(--color-graphite);
  margin-top: 4px;
}
.product-price {
  font-size: 16px;
  color: var(--color-carbon-ink);
  margin-top: 8px;
}

/* How it works */
.how-content {
  display: flex;
  align-items: center;
  gap: 64px;
}
.how-photo {
  flex: 0 0 40%;
  min-width: 0;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-lg);
}
.how-steps {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.how-step {
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: 24px;
}
.step-num {
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  display: block;
  margin-bottom: 16px;
}
.how-step h4 {
  font-family: var(--font-geist);
  font-style: normal;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 8px;
}
.how-step p {
  font-family: var(--font-geist);
  font-size: 14px;
  color: rgba(255,255,255,0.7);
}

/* Science / editorial section */
.science-explain {
  display: flex;
  align-items: center;
  gap: 64px;
  max-width: var(--page-max-width);
  margin: 0 auto;
}
.science-explain-text { flex: 0 0 55%; }
.science-explain-text h3 {
  font-family: var(--font-serif);
  font-size: 32px;
  margin-bottom: 20px;
  color: var(--color-carbon-ink);
}
.science-explain-text p {
  font-family: var(--font-geist);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-graphite);
  margin-bottom: 16px;
}
.science-explain-visual {
  flex: 1;
  aspect-ratio: 4 / 3;
  background: var(--color-fog);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* Brain particle visualisation */
.brain-viz-split {
  display: flex;
  align-items: center;
  gap: 64px;
  max-width: var(--page-max-width);
  margin: 0 auto;
}
.brain-viz-stage {
  position: relative;
  flex: 0 0 68%;
  width: 100%;
  aspect-ratio: 420 / 400;
  border-radius: var(--radius-lg);
  overflow: hidden;
  filter: drop-shadow(0 30px 60px rgba(0,0,0,0.55)) drop-shadow(0 8px 20px rgba(204,46,57,0.12));
}
.brain-viz-canvas-3d {
  width: 100%;
  height: 100%;
  display: block;
}
.brain-viz-callout {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  white-space: nowrap;
  z-index: 2;
}
.brain-viz-callout[aria-hidden="false"] {
  opacity: 1;
}
.brain-viz-callout-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  box-shadow: 0 0 8px 2px currentColor;
}
.brain-viz-callout-label {
  font-family: var(--font-geist);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-paper-white);
  background: rgba(0,0,0,0.55);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255,255,255,0.25);
}
/* Idle and explanation copy occupy the same grid cell and cross-fade — same
   pattern as the two Dala crops swapping their side text while the visual zooms. */
.brain-viz-text-stack {
  flex: 1;
  display: grid;
}
.brain-viz-text {
  grid-area: 1 / 1;
  transition: opacity 0.5s ease, transform 0.5s ease;
  opacity: 1;
  transform: translateY(0);
}
.brain-viz-text-explain {
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
}
.brain-viz-text-stack.is-explaining .brain-viz-text-idle {
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
}
.brain-viz-text-stack.is-explaining .brain-viz-text-explain {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.brain-viz-text h3 {
  font-family: var(--font-serif);
  font-size: 32px;
  color: var(--color-paper-white);
  margin-bottom: 16px;
}
.brain-viz-caption {
  font-family: var(--font-geist);
  font-size: 15px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 24px;
}

.science-early {
  max-width: 680px;
  margin: 0 auto;
}
.science-early h3 {
  font-family: var(--font-serif);
  font-size: 32px;
  margin-bottom: 20px;
}
.science-early p {
  font-family: var(--font-geist);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-graphite);
  margin-bottom: 16px;
}

.science-product { max-width: var(--page-max-width); margin: 0 auto; }
.science-product h3 {
  font-family: var(--font-serif);
  font-size: 32px;
  margin-bottom: 32px;
}
.science-product-row {
  display: flex;
  align-items: center;
  gap: 48px;
  margin-bottom: 24px;
}
.science-product-text { flex: 0 0 52%; }
.science-product-text p,
.science-product-text-full {
  font-family: var(--font-geist);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-graphite);
}
.science-product-text-full { max-width: 720px; margin-bottom: 40px; }
.science-product-visual {
  flex: 1;
  min-height: 260px;
  background: var(--color-fog);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.science-product-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-content {
  max-width: 720px;
}
.about-content p {
  font-family: var(--font-geist);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-graphite);
  margin-bottom: 16px;
}
.about-content p:last-child { margin-bottom: 0; }

.science-pullquote {
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 32px;
  line-height: 1.3;
  color: var(--color-carbon-ink);
}

.science-disclaimer {
  background: var(--color-fog);
  border: 1px solid var(--color-mist);
  border-radius: var(--radius-lg);
  max-width: var(--page-max-width);
  margin: 0 auto 32px;
  padding: 20px 28px;
}
.science-disclaimer p {
  font-family: var(--font-geist);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-carbon-ink);
}

.science-sources { max-width: var(--page-max-width); margin: 0 auto; }
.science-sources li {
  font-family: var(--font-geist);
  font-size: 13px;
  color: var(--color-graphite);
  margin-bottom: 8px;
  border-bottom: 1px solid var(--color-mist);
  padding-bottom: 8px;
}
.science-sources a {
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.038em;
  color: var(--color-carbon-ink);
}
.science-sources a:hover { color: var(--color-ember-red); }

/* Reviews */
.review-carousel-viewport {
  overflow: hidden;
  max-width: 900px;
}
.review-carousel-track {
  display: flex;
  gap: 32px;
  width: max-content;
  animation: reviews-scroll 50s linear infinite;
}
.review-carousel-track.paused {
  animation-play-state: paused;
}
@keyframes reviews-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.review-card {
  flex: 0 0 340px;
  border-top: 1px solid var(--color-mist);
  padding-top: 24px;
}
.stars {
  font-family: var(--font-geist);
  color: var(--color-carbon-ink);
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.review-card p {
  font-family: var(--font-geist);
  font-size: 16px;
  color: var(--color-carbon-ink);
  margin-bottom: 16px;
}
.reviewer {
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.038em;
  color: var(--color-graphite);
}

/* Newsletter */
.newsletter {
  text-align: center;
}
.newsletter h2 {
  font-size: 48px;
  margin-bottom: 12px;
}
.newsletter p {
  font-family: var(--font-geist);
  color: rgba(255,255,255,0.75);
  margin-bottom: 28px;
}
.newsletter-form {
  display: flex;
  justify-content: center;
  gap: 10px;
  max-width: 420px;
  margin: 0 auto;
}
.newsletter-form input {
  flex: 1;
  height: 44px;
  padding: 0 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.3);
  background: transparent;
  color: var(--color-paper-white);
  font-family: var(--font-geist);
  font-size: 14px;
}
.newsletter-form input::placeholder { color: rgba(255,255,255,0.5); }

/* Footer */
.footer {
  background: var(--color-true-black);
  color: rgba(255,255,255,0.6);
  padding: 64px 40px 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: var(--page-max-width);
  margin: 0 auto 48px;
}
.footer-grid h5 {
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.038em;
  color: var(--color-paper-white);
  margin-bottom: 16px;
}
.footer-grid a {
  display: block;
  font-family: var(--font-geist);
  font-size: 14px;
  margin-bottom: 10px;
  transition: color 0.15s;
}
.footer-grid a:hover { color: var(--color-paper-white); }
.footer-grid p {
  font-family: var(--font-geist);
  font-size: 13px;
  margin-top: 12px;
  max-width: 260px;
}
.footer .logo { color: var(--color-paper-white); }
.footer-bottom {
  font-family: var(--font-geist);
  font-size: 12px;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 24px;
  max-width: var(--page-max-width);
  margin: 0 auto;
}

/* Product detail page */
.pdp { padding: var(--section-gap) 0; }
.pdp-card { max-width: 1160px; margin: 0 auto; font-family: var(--font-sans); }
.pdp-grid {
  display: flex;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
}
.pdp-gallery {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex: 1.3 1 520px;
}
.pdp-gallery-thumbs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 56px;
  flex-shrink: 0;
  max-height: 320px;
  overflow-y: auto;
}
.pdp-gallery-thumbs[hidden] { display: none; }
.pdp-gallery-thumb {
  all: unset;
  box-sizing: border-box;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: 6px;
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  background: var(--surface-1);
}
.pdp-gallery-thumb:hover { border-color: var(--border-strong); }
.pdp-gallery-thumb.is-active { border-color: var(--text-accent); border-width: 2px; }
.pdp-gallery-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.pdp-gallery-thumb-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.28);
  color: var(--on-primary);
}
.pdp-gallery-main {
  position: relative;
  flex: 1;
  aspect-ratio: 1 / 1;
  background: var(--surface-1);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
  touch-action: pan-y;
}
.pdp-gallery-main-img,
.pdp-gallery-main-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.pdp-gallery-main-img[hidden],
.pdp-gallery-main-video[hidden] { display: none; }
.pdp-gallery-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  border: 2px solid rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--on-primary);
  cursor: pointer;
}
.pdp-gallery-play[hidden] { display: none; }
.pdp-gallery-play svg { margin-left: 3px; }
.pdp-gallery-zoom {
  position: absolute;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 2px solid var(--surface-2);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  background: var(--surface-2);
}
.pdp-gallery-zoom[hidden] { display: none; }
.pdp-gallery-zoom-img { width: 100%; height: 100%; object-fit: cover; }
.pdp-gallery-zoom-line {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.pdp-gallery-zoom-line[hidden] { display: none; }
.pdp-gallery-zoom-line line {
  stroke: var(--border-strong);
  stroke-width: 1;
  stroke-dasharray: 3 3;
}
.pdp-info { flex: 1 1 280px; display: flex; flex-direction: column; }
.pdp-info h1 {
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 500;
  font-size: 26px;
  margin: 0 0 8px;
  color: var(--text-primary);
}
.pdp-desc {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0 0 16px;
}
.pdp-features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.pdp-feature {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-primary);
}
.pdp-feature-check {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  color: var(--text-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.pdp-price-label {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 2px;
}
.pdp-price {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0 0 6px;
}
.pdp-stock {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-success);
  margin-bottom: 16px;
}
.pdp-stock-dot {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  color: var(--text-success);
  display: flex;
  align-items: center;
  justify-content: center;
}
.pdp-actions {
  display: flex;
  flex-direction: column;
}
.pdp-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
  cursor: pointer;
  transition: opacity 0.15s;
}
.pdp-btn:hover { opacity: 0.85; }
.pdp-btn-primary {
  height: 44px;
  background: var(--fill-primary);
  color: var(--on-primary);
  border: none;
  font-size: 15px;
  margin-bottom: 8px;
}
.pdp-btn-outline {
  height: 40px;
  background: transparent;
  color: var(--text-primary);
  border: 0.5px solid var(--border-strong);
  font-size: 14px;
  margin-bottom: 10px;
}
.pdp-share-row { display: flex; justify-content: flex-end; }
.pdp-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 10px;
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}
.pdp-share-btn:hover { color: var(--text-primary); }
.pdp-upsell {
  margin-top: 20px;
  margin-bottom: 20px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 16px;
}
.pdp-upsell-label {
  font-family: var(--font-bryant);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-slate);
  margin-bottom: 12px;
}
.pdp-upsell-option {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.pdp-upsell-thumb {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: var(--color-fog);
  flex-shrink: 0;
}
.pdp-upsell-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.pdp-upsell-name {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--text-primary);
}
.pdp-upsell-price {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ember-red);
}
.pdp-upsell-price s {
  color: var(--color-slate);
  font-weight: 400;
  margin-right: 6px;
}
.pdp-upsell-checkbox {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  accent-color: var(--fill-primary);
}
.pdp-upsell-total {
  display: none;
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}
.pdp-upsell-total.visible { display: block; }
.pdp-shipping {
  margin-top: 20px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--bg-accent);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.pdp-shipping svg { flex: 0 0 auto; margin-top: 2px; color: var(--text-accent); }
.pdp-shipping p { font-family: var(--font-sans); font-size: 13px; color: var(--text-accent); }
.pdp-details {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 0.5px solid var(--border);
}
.pdp-details h2 {
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 500;
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--text-primary);
}
.pdp-details > p {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0 0 16px;
}
.pdp-spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.pdp-spec-card {
  background: var(--surface-1);
  border-radius: var(--radius);
  padding: 12px;
}
.pdp-spec-label {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  margin: 0 0 2px;
}
.pdp-spec-value {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-primary);
  margin: 0;
}

@media (max-width: 900px) {
  .header { flex-wrap: wrap; height: auto; padding: 12px 20px; gap: 12px; }
  .nav { display: none; }
  .search-field { order: 3; max-width: 100%; }
  .filter-bar { padding: 16px 20px; }
  .band, .hero-split-text { padding: 48px 20px; }
  .hero-split { flex-direction: column; min-height: 0; }
  .hero-split-text h1 { font-size: 30px; line-height: 1.2; }
  .hero-split-image { min-height: 280px; }
  .hero-disclaimer-bar p { font-size: 12px; }
  .hero-split-buttons { flex-direction: column; align-items: stretch; }
  .section-heading { font-size: 34px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .science-explain { flex-direction: column; gap: 32px; }
  .science-product-row { flex-direction: column; }
  .science-pullquote { font-size: 24px; }
  .how-content { flex-direction: column; }
  .how-photo { flex: 0 0 auto; width: 100%; aspect-ratio: 4 / 3; }
  .brain-viz-split { flex-direction: column; gap: 32px; }
  .brain-viz-stage { flex: 0 0 auto; }
  .brain-viz-text { text-align: center; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .wrap { padding: 0 24px; }
  .pdp-spec-grid { gap: 10px; }
  .pdp-spec-card { padding: 12px 14px; }
  .pdp-gallery { flex-direction: column; }
  .pdp-gallery-thumbs {
    flex-direction: row;
    width: auto;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    order: 2;
  }
}