/* ============================================================
   BIOSTACK LABS — B2B CATALOGUE STYLESHEET
   Clinical White Design System
   Version: 1.0
   ============================================================ */

/* ============================================================
   1. GOOGLE FONTS
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================================
   2. DESIGN SYSTEM TOKENS
   ============================================================ */
:root {
  /* Hero / Dark sections */
  --color-hero-bg: #0D0F11;
  --color-dark-section: #111318;
  --color-dark-card: #181C22;
  --color-dark-elevated: #1E232C;

  /* Clinical body */
  --color-bg-base: #FAFAFA;
  --color-bg-surface: #FFFFFF;
  --color-bg-elevated: #F4F5F6;
  --color-bg-alt: #F0F2F4;

  /* Typography */
  --color-text-primary: #0D1117;
  --color-text-secondary: #374151;
  --color-text-muted: #6B7280;
  --color-text-faint: #9CA3AF;
  --color-text-on-dark: #F0F4F8;
  --color-text-muted-on-dark: #8A9BB0;

  /* Borders */
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-medium: rgba(0, 0, 0, 0.14);
  --color-border-dark: rgba(255, 255, 255, 0.1);
  --color-border-dark-medium: rgba(255, 255, 255, 0.16);

  /* Global accent — gold (from label branding system) */
  --color-accent-gold: #B8902A;
  --color-accent-gold-light: rgba(184, 144, 42, 0.12);
  --color-accent-gold-mid: rgba(184, 144, 42, 0.25);

  /* Product accent colours — matched to physical label photography */
  --color-nad: #B8902A;        /* NAD Regen — gold/olive */
  --color-nad-light: rgba(184, 144, 42, 0.1);
  --color-cell: #8E9BAA;       /* Cell Shield — silver-grey metallic */
  --color-cell-light: rgba(142, 155, 170, 0.12);
  --color-gd: #D4635A;         /* GDAid — coral/rose */
  --color-gd-light: rgba(212, 99, 90, 0.1);
  --color-gly: #9B8EC4;        /* GlyNAC+ — soft lavender */
  --color-gly-light: rgba(155, 142, 196, 0.1);

  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'Inter', sans-serif;

  --text-6xl: clamp(3rem, 7vw, 5.5rem);
  --text-5xl: clamp(2.5rem, 6vw, 4.5rem);
  --text-4xl: clamp(2rem, 4vw, 3rem);
  --text-3xl: clamp(1.5rem, 3vw, 2.25rem);
  --text-2xl: clamp(1.25rem, 2vw, 1.75rem);
  --text-xl: 1.25rem;
  --text-lg: 1.125rem;
  --text-base: 1rem;
  --text-sm: 0.875rem;
  --text-xs: 0.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.14), 0 8px 24px rgba(0,0,0,0.06);

  /* Layout */
  --max-width: 1280px;
  --nav-height: 72px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
}

/* ============================================================
   3. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden; /* Prevents horizontal scroll without breaking position:sticky */
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-bg-base);
  line-height: 1.6;
  /* Do NOT use overflow-x:hidden here — it breaks position:sticky on all children */
}

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

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

ul {
  list-style: none;
}

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

/* ============================================================
   4. LAYOUT UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-8); }
}

@media (min-width: 1440px) {
  .container { padding: 0 var(--space-12); }
}

.section {
  padding: var(--space-20) 0;
}

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

@media (min-width: 1024px) {
  .section { padding: var(--space-32) 0; }
}

/* ============================================================
   5. NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.nav--transparent {
  background: transparent;
}

.nav--scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border-medium);
}

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

.nav__logo {
  display: flex;
  align-items: center;
  height: 36px;
}

.nav__logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
  transition: filter var(--transition-normal);
}

.nav__logo--dark img {
  filter: none;
  display: block;
}

.nav__logo--light img {
  filter: invert(1) brightness(2);
  display: block;
}

/* Over hero (dark): show white logo via invert */
.nav--transparent .nav__logo img {
  filter: brightness(0) invert(1);
}

/* Scrolled (light bg): logo is a white PNG — invert to black, then tint gold to ensure contrast */
.nav--scrolled .nav__logo img {
  filter: brightness(0) saturate(0);
}

.nav__links {
  display: none;
  gap: var(--space-8);
  align-items: center;
}

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

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  color: var(--color-text-on-dark);
}

.nav--scrolled .nav__link {
  color: var(--color-text-muted);
}

.nav__link:hover {
  color: var(--color-accent-gold);
}

.nav--scrolled .nav__link:hover {
  color: var(--color-text-primary);
}

.nav__cta {
  display: none;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  border: 1px solid rgba(255,255,255,0.4);
  color: var(--color-text-on-dark);
}

.nav--scrolled .nav__cta {
  border-color: var(--color-accent-gold);
  color: var(--color-accent-gold);
  background: transparent;
}

.nav--scrolled .nav__cta:hover {
  background: var(--color-accent-gold);
  color: white;
}

.nav__cta:not(.nav--scrolled .nav__cta):hover {
  background: rgba(255,255,255,0.12);
}

@media (min-width: 768px) {
  .nav__cta { display: inline-flex; align-items: center; }
}

.nav__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

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

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text-on-dark);
  transition: background var(--transition-normal);
}

.nav--scrolled .nav__hamburger span {
  background: var(--color-text-primary);
}

/* ============================================================
   6. HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  background: var(--color-hero-bg);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg-grain {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0.4;
  pointer-events: none;
}

.hero__bg-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 700px;
  height: 700px;
  background: radial-gradient(ellipse, rgba(184,144,42,0.06) 0%, transparent 65%);
  pointer-events: none;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  align-items: center;
  width: 100%;
  padding-top: var(--nav-height);
  min-height: 100vh;
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: 55% 45%;
    gap: 0;
    min-height: 100vh;
  }
}

.hero__content {
  padding: var(--space-16) 0 var(--space-6);
  width: 100%;
}

@media (min-width: 1024px) {
  .hero__content {
    padding: var(--space-24) 0;
  }
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-6);
}

.hero__eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-accent-gold);
}

.hero__headline {
  font-family: var(--font-body);
  font-size: var(--text-6xl);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.025em;
  color: var(--color-text-on-dark);
  margin-bottom: var(--space-6);
}

.hero__headline em {
  font-style: normal;
  color: var(--color-accent-gold);
}

.hero__rule {
  display: block;
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-gold), rgba(184,144,42,0.3));
  margin-bottom: var(--space-6);
}

.hero__subheadline {
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text-muted-on-dark);
  max-width: 480px;
  line-height: 1.65;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-bottom: var(--space-10);
}

@media (min-width: 1024px) {
  .hero__visual {
    height: 100%;
    min-height: 100vh;
    padding-bottom: 0;
  }
}

/* ---- Bottle image hero ---- */
.hero__bottle-hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* Ambient gold glow behind the bottle */
.hero__bottle-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(ellipse at center,
    rgba(184, 144, 42, 0.2) 0%,
    rgba(184, 144, 42, 0.07) 40%,
    transparent 70%
  );
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  animation: glowPulse 4s ease-in-out infinite;
}

.hero__bottle-img {
  position: relative;
  z-index: 1;
  /* Mobile-first: smaller bottle */
  width: 200px;
  max-width: 65vw;
  filter:
    drop-shadow(0 20px 40px rgba(0,0,0,0.8))
    drop-shadow(0 0 30px rgba(184,144,42,0.2));
  animation: bottleFloat 6s ease-in-out infinite;
  transform-origin: center bottom;
}

@media (min-width: 480px) {
  .hero__bottle-img { width: 240px; }
}

@media (min-width: 768px) {
  .hero__bottle-img { width: 300px; }
}

@media (min-width: 1024px) {
  .hero__bottle-img {
    width: 340px;
    max-width: 90%;
    filter:
      drop-shadow(0 40px 80px rgba(0,0,0,0.8))
      drop-shadow(0 0 60px rgba(184,144,42,0.2));
  }
}

@media (min-width: 1280px) {
  .hero__bottle-img { width: 400px; }
}

@media (min-width: 1440px) {
  .hero__bottle-img { width: 460px; }
}

@keyframes bottleFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  33%       { transform: translateY(-16px) rotate(0.5deg); }
  66%       { transform: translateY(-7px) rotate(-0.3deg); }
}

@keyframes glowPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.7; transform: scale(0.92); }
}

@media (prefers-reduced-motion: reduce) {
  .hero__bottle-img,
  .hero__bottle-glow {
    animation: none;
  }
}

/* ============================================================
   7. PHILOSOPHY STRIP
   ============================================================ */
.philosophy-strip {
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-10) 0;
}

.philosophy-strip__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .philosophy-strip__inner {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
  }
}

.philosophy-stat {
  text-align: center;
  padding: var(--space-4) var(--space-6);
}

@media (min-width: 768px) {
  .philosophy-stat {
    border-right: 1px solid var(--color-border);
  }
  .philosophy-stat:last-child { border-right: none; }
}

.philosophy-stat__number {
  font-family: var(--font-body);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  line-height: 1.1;
  margin-bottom: var(--space-1);
}

.philosophy-stat__label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

/* ============================================================
   8. SECTION HEADER
   ============================================================ */
.section-header {
  margin-bottom: var(--space-12);
}

.section-header--center {
  text-align: center;
}

.section-header__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-4);
}

.section-header__eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-accent-gold);
}

.section-header--center .section-header__eyebrow {
  justify-content: center;
}

.section-header--center .section-header__eyebrow::before {
  display: none;
}

.section-header__title {
  font-family: var(--font-body);
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  line-height: 1.08;
  margin-bottom: var(--space-4);
}

.section-header--dark .section-header__title {
  color: var(--color-text-on-dark);
}

.section-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 580px;
  line-height: 1.65;
}

.section-header--center .section-header__subtitle {
  margin: 0 auto;
}

.section-header--dark .section-header__subtitle {
  color: var(--color-text-muted-on-dark);
}

/* Gold underline rule — mirrors label branding motif */
.section-rule {
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-accent-gold);
  margin-bottom: var(--space-6);
  border-radius: 2px;
}

.section-header--center .section-rule {
  margin: 0 auto var(--space-6);
}

/* ============================================================
   9. PRODUCT SECTION
   ============================================================ */
.products {
  background: var(--color-bg-base);
}

/* Product filter tabs */
.product-filters {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-10);
  scrollbar-width: none;
}

.product-filters::-webkit-scrollbar { display: none; }

.product-filter-btn {
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-5);
  border-radius: 99px;
  border: 1px solid var(--color-border-medium);
  color: var(--color-text-muted);
  background: var(--color-bg-surface);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.product-filter-btn--active,
.product-filter-btn:hover {
  border-color: var(--color-accent-gold);
  color: var(--color-accent-gold);
  background: var(--color-accent-gold-light);
}

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

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

/* Product card */
.product-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-slow);
  position: relative;
  display: flex;
  flex-direction: column;
}

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

.product-card--active {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-medium);
}

.product-card__category {
  padding: var(--space-4) var(--space-5) 0;
}

.product-card__pill {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: 99px;
  background: var(--pill-color-light, var(--color-accent-gold-light));
  color: var(--pill-color, var(--color-accent-gold));
}

.product-card__image-wrap {
  padding: var(--space-6) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-elevated);
  margin: var(--space-4) var(--space-5);
  border-radius: var(--border-radius);
  min-height: 220px;
}

.product-card__image-wrap img {
  max-height: 200px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.12));
  transition: transform var(--transition-slow);
}

.product-card:hover .product-card__image-wrap img {
  transform: scale(1.04) translateY(-4px);
}

.product-card__body {
  flex: 1;
  padding: var(--space-5);
}

.product-card__name {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.15;
}

.product-card__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}

.product-card__branded-logos {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
}

.product-card__branded-logo {
  height: 18px;
  width: auto;
  opacity: 0.7;
  filter: grayscale(1) contrast(0.8);
  transition: opacity var(--transition-fast), filter var(--transition-fast);
}

.product-card:hover .product-card__branded-logo {
  opacity: 1;
  filter: grayscale(0);
}

.product-card__footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.product-card__view-btn {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--card-accent, var(--color-accent-gold));
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--transition-fast);
}

.product-card:hover .product-card__view-btn {
  gap: var(--space-3);
}

.product-card__view-btn svg {
  width: 14px;
  height: 14px;
}

/* Accent bottom bar */
.product-card__accent-bar {
  height: 3px;
  background: linear-gradient(90deg, var(--card-accent, var(--color-accent-gold)), rgba(255,255,255,0.3));
  border-radius: 0 0 2px 2px;
  margin-top: auto;
}

/* ============================================================
   10. PRODUCT DETAIL PANEL
   ============================================================ */
.product-detail {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              opacity 0.4s ease;
  opacity: 0;
}

.product-detail--open {
  max-height: 3600px;
  opacity: 1;
}

.product-detail__inner {
  padding: var(--space-12) 0;
}

.product-detail__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}

@media (min-width: 768px) {
  .product-detail__grid {
    grid-template-columns: 240px 1fr;
    gap: var(--space-12);
  }
}

@media (min-width: 1024px) {
  .product-detail__grid {
    grid-template-columns: 280px 1fr;
    gap: var(--space-16);
  }
}

.product-detail__bottle-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.product-detail__bottle-img {
  max-width: 220px;
  filter: drop-shadow(0 16px 40px rgba(0,0,0,0.15));
}

.product-detail__content-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .product-detail__content-col {
    grid-template-columns: 1fr 1fr;
  }
}

.detail-block__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-medium);
}

.detail-block__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.detail-block__text {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Ingredient list */
.ingredient-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ingredient-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-4);
}

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

.ingredient-item__info {
  flex: 1;
}

.ingredient-item__name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.ingredient-item__branded {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent-gold);
}

.ingredient-item__branded img {
  height: 14px;
  width: auto;
  object-fit: contain;
}

.ingredient-item__note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.ingredient-item__dose {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-primary);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* Mechanism list */
.mechanism-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mechanism-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.mechanism-item::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--detail-accent, var(--color-accent-gold));
  margin-top: 6px;
}

/* Use cases */
.use-case-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.use-case-tag {
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: 99px;
  background: var(--detail-accent-light, var(--color-accent-gold-light));
  color: var(--detail-accent, var(--color-accent-gold));
  border: 1px solid var(--detail-accent-border, rgba(184,144,42,0.2));
}

/* Detail CTA */
.detail-cta-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  grid-column: 1 / -1;
  align-items: center;
  justify-content: space-between;
}

.detail-hero-stat {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.detail-hero-stat strong {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--detail-accent, var(--color-accent-gold));
  display: block;
}

/* ============================================================
   11. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}

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

.btn--primary:hover {
  background: #1C2333;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-medium);
}

.btn--outline:hover {
  border-color: var(--color-text-primary);
  background: var(--color-bg-elevated);
}

.btn--gold {
  background: var(--color-accent-gold);
  color: white;
  border-color: var(--color-accent-gold);
}

.btn--gold:hover {
  background: #9E7A22;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(184,144,42,0.3);
}

.btn--gold-outline {
  background: transparent;
  color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
}

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

.btn--ghost-light {
  background: transparent;
  color: var(--color-text-on-dark);
  border-color: rgba(255,255,255,0.3);
}

.btn--ghost-light:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.5);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* ============================================================
   12. SCIENCE / BRAND STORY SECTION
   ============================================================ */
.science {
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
}

.science__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .science__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }
}

.science__pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.science-pillar {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.science-pillar:hover {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 0 3px var(--color-accent-gold-light);
}

.science-pillar__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
  background: var(--color-accent-gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.science-pillar__icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-accent-gold);
}

.science-pillar__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.science-pillar__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.science__quote {
  border-left: 3px solid var(--color-accent-gold);
  padding-left: var(--space-6);
  margin-top: var(--space-8);
}

.science__quote-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.4;
  font-style: italic;
}

/* ============================================================
   13. BRANDED INGREDIENTS STRIP
   ============================================================ */
.ingredients-strip {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-10) 0;
}

.ingredients-strip__label {
  text-align: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
}

.ingredients-strip__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.ingredients-strip__logo {
  height: 32px;
  width: auto;
  max-width: 120px;
  object-fit: contain;
  opacity: 0.65;
  filter: grayscale(1) contrast(0.9);
  transition: opacity var(--transition-normal), filter var(--transition-normal);
}

.ingredients-strip__logo:hover {
  opacity: 1;
  filter: grayscale(0);
}

/* ============================================================
   14. BUSINESS OPPORTUNITY SECTION (DARK)
   ============================================================ */
.opportunity {
  background: var(--color-dark-section);
  position: relative;
  overflow: hidden;
}

.opportunity__bg-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.opportunity__bg-glow {
  position: absolute;
  bottom: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(184,144,42,0.05) 0%, transparent 70%);
  pointer-events: none;
}

.opportunity__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-top: var(--space-12);
}

@media (min-width: 768px) {
  .opportunity__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.opportunity-card {
  background: var(--color-dark-card);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--border-radius-lg);
  padding: var(--space-8);
  transition: border-color var(--transition-normal), transform var(--transition-slow);
}

.opportunity-card:hover {
  border-color: var(--color-border-dark-medium);
  transform: translateY(-4px);
}

.opportunity-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius);
  background: rgba(184,144,42,0.1);
  border: 1px solid rgba(184,144,42,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
}

.opportunity-card__icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--color-accent-gold);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.opportunity-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-on-dark);
  margin-bottom: var(--space-3);
}

.opportunity-card__text {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-text-muted-on-dark);
}

/* ============================================================
   15. ENDORSEMENT / TESTIMONIAL
   ============================================================ */
.endorsement {
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
}

.endorsement__inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.endorsement__mark {
  font-family: Georgia, serif;
  font-size: 80px;
  line-height: 0.7;
  color: var(--color-accent-gold);
  opacity: 0.4;
  margin-bottom: var(--space-6);
  display: block;
}

.endorsement__quote {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.3;
  font-style: italic;
  margin-bottom: var(--space-8);
}

.endorsement__attribution {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.endorsement__name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-primary);
}

.endorsement__title {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================================
   16. CTA SECTION
   ============================================================ */
.cta-section {
  background: var(--color-bg-base);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.cta-section__divider {
  width: 48px;
  height: 2px;
  background: var(--color-accent-gold);
  margin: 0 auto var(--space-10);
  border-radius: 2px;
}

.cta-section__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.cta-section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 480px;
  margin: 0 auto var(--space-10);
  line-height: 1.65;
}

.cta-section__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-section__note {
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}

/* ============================================================
   17. FOOTER
   ============================================================ */
.footer {
  background: var(--color-hero-bg);
  border-top: 1px solid var(--color-border-dark);
  padding: var(--space-16) 0 var(--space-10);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 200px 1fr;
    gap: var(--space-16);
  }
}

.footer__brand img {
  height: 32px;
  width: auto;
  filter: brightness(0) invert(1);
  margin-bottom: var(--space-4);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted-on-dark);
  line-height: 1.6;
  max-width: 200px;
}

.footer__nav-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .footer__nav-group {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer__nav-title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted-on-dark);
  margin-bottom: var(--space-4);
}

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

.footer__nav-link {
  font-size: var(--text-sm);
  color: rgba(240, 244, 248, 0.5);
  transition: color var(--transition-fast);
}

.footer__nav-link:hover {
  color: var(--color-text-on-dark);
}

.footer__bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
}

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

.footer__copyright {
  font-size: var(--text-xs);
  color: rgba(240, 244, 248, 0.35);
}

.footer__legal-links {
  display: flex;
  gap: var(--space-6);
}

.footer__legal-link {
  font-size: var(--text-xs);
  color: rgba(240, 244, 248, 0.35);
  transition: color var(--transition-fast);
}

.footer__legal-link:hover {
  color: var(--color-text-muted-on-dark);
}

/* ============================================================
   18. SCROLL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }

/* Counter animation */
.counter { font-variant-numeric: tabular-nums; }

/* ============================================================
   19. REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html { scroll-behavior: auto; }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================================
   20. MOBILE MENU
   ============================================================ */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(13,15,17,0.97);
  backdrop-filter: blur(20px);
  z-index: 99;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.mobile-menu--open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-on-dark);
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover {
  color: var(--color-accent-gold);
}

.mobile-menu__close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  color: var(--color-text-on-dark);
  font-size: 24px;
  padding: var(--space-2);
}

/* ============================================================
   21. UTILITY: VISUALLY HIDDEN
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus states */
:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ============================================================
   22. ENQUIRY MODAL
   ============================================================ */

/* Scroll lock */
body.modal-open {
  overflow: hidden;
}

/* Overlay backdrop */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: rgba(10, 11, 14, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

/* Modal card */
.modal {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: var(--space-8) var(--space-6);
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.22), 0 8px 24px rgba(0, 0, 0, 0.12);
  transform: translateY(24px) scale(0.97);
  transition: transform var(--transition-normal);
}

.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
}

/* Close button */
.modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.modal__close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text-primary);
}

/* Header */
.modal__header {
  margin-bottom: var(--space-6);
}

.modal__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-2);
}

.modal__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-3);
}

.modal__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Form layout */
.modal__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

.form-label {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
}

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

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-bg-elevated);
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-sizing: border-box;
  -webkit-appearance: none;
  appearance: none;
}

.form-input::placeholder {
  color: var(--color-text-muted);
  opacity: 0.65;
}

.form-input:focus {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 0 3px var(--color-accent-gold-light);
  background: var(--color-bg-surface);
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.6;
}

/* Submit button — full width inside modal */
.modal__submit {
  width: 100%;
  margin-top: var(--space-2);
}

/* Privacy note */
.modal__privacy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.5;
  margin-top: var(--space-1);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .modal-overlay,
  .modal {
    transition: none;
  }
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .modal {
    padding: var(--space-6) var(--space-4);
    border-radius: 12px;
  }
}