/* ═══════════════════════════════════════════════════════════
   HTL-RTT | Health Therapies Lifestyle
   Premium Biotech Landing Page Stylesheet
   ═══════════════════════════════════════════════════════════ */

/* ── Custom Properties ────────────────────────────────────── */
:root {
  --navy:       #10284A;
  --navy-dark:  #0a1c34;
  --navy-light: #1a3a6b;
  --teal:       #1388A0;
  --teal-light: #1ba8c6;
  --teal-pale:  #e8f5f8;
  --burgundy:   #921B36;
  --white:      #FFFFFF;
  --off-white:  #F5F7FA;
  --gray-100:   #f0f2f5;
  --gray-200:   #e2e6ea;
  --gray-400:   #9ba3ae;
  --gray-600:   #5a6472;
  --gray-800:   #2d3748;
  --text-body:  #3d4d60;

  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  --shadow-sm: 0 1px 4px rgba(16,40,74,.06);
  --shadow-md: 0 4px 20px rgba(16,40,74,.10);
  --shadow-lg: 0 12px 48px rgba(16,40,74,.15);
  --shadow-xl: 0 24px 80px rgba(16,40,74,.20);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition: .3s cubic-bezier(.4,0,.2,1);
  --transition-slow: .6s cubic-bezier(.4,0,.2,1);

  --container: 1180px;
  --container-narrow: 780px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--text-body);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul { list-style: none; }

/* ── Typography ───────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  line-height: 1.2;
  color: var(--navy);
}
h1 { font-size: clamp(3rem, 6vw, 5.5rem); font-weight: 700; letter-spacing: -.02em; }
h2 { font-size: clamp(1.9rem, 3.5vw, 3rem); font-weight: 600; }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; }
p  { line-height: 1.8; }

.text-white { color: var(--white); }
.text-muted { color: rgba(255,255,255,.72); }
.text-small { font-size: .8rem; color: var(--gray-400); }

/* ── Containers ───────────────────────────────────────────── */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: var(--container-narrow); }

/* ── Utility ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 50px;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .02em;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--navy);
  color: var(--white);
  box-shadow: 0 6px 24px rgba(16,40,74,.28);
}
.btn--primary:hover { background: var(--navy-light); box-shadow: 0 10px 32px rgba(16,40,74,.36); }

.btn--outline {
  background: transparent;
  color: var(--navy);
  border: 2px solid var(--navy);
}
.btn--outline:hover { background: var(--navy); color: var(--white); }

.btn--teal {
  background: var(--teal);
  color: var(--white);
  box-shadow: 0 6px 24px rgba(19,136,160,.3);
}
.btn--teal:hover { background: var(--teal-light); box-shadow: 0 10px 32px rgba(19,136,160,.4); }

/* ── Sections ─────────────────────────────────────────────── */
.section { padding: 100px 0; }
.section--white { background: var(--white); }
.section--light { background: var(--off-white); }
.section--dark  { background: var(--navy); }

.section-header { text-align: center; max-width: 660px; margin: 0 auto 64px; }
.section-label {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--teal);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-label--light { color: var(--teal-light); }
.section-subtitle { font-size: 1.15rem; color: var(--gray-600); margin-top: 12px; }
.section-body { font-size: 1.05rem; color: var(--text-body); margin-top: 16px; line-height: 1.9; }

/* ── Fade-in Animations ───────────────────────────────────── */
/* JS adds .js-ready to body; animations only apply when JS is active */
body.js-ready .fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.fade-in--delay { transition-delay: .18s; }
.fade-in--delay2 { transition-delay: .34s; }
body.js-ready .fade-in.visible { opacity: 1; transform: translateY(0); }

/* ════════════════════════════════════════════════════════════
   NAVIGATION
   ════════════════════════════════════════════════════════════ */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--gray-200);
  transition: box-shadow var(--transition), background var(--transition);
}
.nav-header.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255,255,255,.98);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  gap: 20px;
}

.nav-logo img {
  height: 42px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 8px 14px;
  font-size: .88rem;
  font-weight: 500;
  color: var(--navy);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-link:hover { background: var(--off-white); color: var(--teal); }

.nav-cta {
  padding: 10px 22px;
  background: var(--navy);
  color: var(--white);
  border-radius: 50px;
  font-size: .85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition);
}
.nav-cta:hover { background: var(--teal); transform: translateY(-1px); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ════════════════════════════════════════════════════════════
   HERO
   ════════════════════════════════════════════════════════════ */
.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 100px 24px 60px;
  background: linear-gradient(155deg, var(--white) 0%, #eef4f8 55%, #ddeef5 100%);
  position: relative;
  overflow: hidden;
}

/* Decorative circles */
.hero-bg-decoration { position: absolute; inset: 0; pointer-events: none; }
.hero-circle {
  position: absolute;
  border-radius: 50%;
}
.hero-circle--1 {
  width: 700px; height: 700px;
  top: -200px; right: -180px;
  background: radial-gradient(circle, rgba(19,136,160,.08) 0%, transparent 70%);
}
.hero-circle--2 {
  width: 500px; height: 500px;
  bottom: -150px; left: -100px;
  background: radial-gradient(circle, rgba(16,40,74,.05) 0%, transparent 70%);
}
.hero-wave {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--navy), var(--teal), var(--burgundy), var(--teal), var(--navy));
  background-size: 200% 100%;
  animation: waveMove 4s linear infinite;
}
@keyframes waveMove { from { background-position: 0 0; } to { background-position: 200% 0; } }

.hero-container {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 60px;
  width: 100%;
}

.hero-label {
  display: inline-block;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--teal);
  text-transform: uppercase;
  background: rgba(19,136,160,.1);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 20px;
  border: 1px solid rgba(19,136,160,.2);
}

.hero-title {
  background: linear-gradient(135deg, var(--navy) 0%, var(--teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.2vw, 1.6rem);
  color: var(--navy);
  font-weight: 400;
  line-height: 1.4;
  margin-bottom: 20px;
}

.hero-body {
  font-size: 1.05rem;
  color: var(--gray-600);
  max-width: 480px;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero image */
.hero-image { position: relative; }
.hero-image-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: var(--white);
}
.hero-image-frame img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .6s ease;
}
.hero-image-frame:hover img { transform: scale(1.02); }

.hero-image-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(ellipse at center, rgba(19,136,160,.15) 0%, transparent 70%);
  z-index: -1;
  border-radius: 50%;
}

/* Disclaimer */
.hero-disclaimer {
  max-width: var(--container);
  margin: 36px auto 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .8rem;
  color: var(--gray-600);
  background: rgba(255,255,255,.85);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 10px 20px;
}
.hero-disclaimer i { color: var(--teal); flex-shrink: 0; }

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--gray-400);
  text-transform: uppercase;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--teal), transparent);
  animation: scrollPulse 2s ease infinite;
}
@keyframes scrollPulse { 0%,100% { opacity: .4; transform: scaleY(1); } 50% { opacity: 1; transform: scaleY(1.2); } }

/* ════════════════════════════════════════════════════════════
   STATS BAR
   ════════════════════════════════════════════════════════════ */
.stats-bar {
  background: var(--navy);
  padding: 40px 24px;
}
.stats-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.stat-item {
  text-align: center;
  padding: 12px 48px;
}
.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  display: block;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.55);
}
.stat-divider {
  width: 1px; height: 40px;
  background: rgba(255,255,255,.15);
}

/* ════════════════════════════════════════════════════════════
   RECEPTOR CARDS
   ════════════════════════════════════════════════════════════ */
.receptor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.receptor-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 1px solid var(--gray-200);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  overflow: hidden;
}
.receptor-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--navy));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}
.receptor-card:hover::before { transform: scaleX(1); }
.receptor-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(19,136,160,.2);
}

.receptor-card--featured {
  background: linear-gradient(135deg, var(--navy) 0%, #1a3a6b 100%);
  color: var(--white);
  border-color: transparent;
}
.receptor-card--featured h3 { color: var(--white); }
.receptor-card--featured p { color: rgba(255,255,255,.8); }
.receptor-card--featured::before { background: linear-gradient(90deg, var(--burgundy), var(--teal)); }

.receptor-card__icon {
  width: 72px; height: 72px;
  margin-bottom: 4px;
}
.receptor-card__icon svg { width: 100%; height: 100%; }

.receptor-card__tag {
  display: inline-block;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--teal);
  background: var(--teal-pale);
  padding: 4px 12px;
  border-radius: 50px;
  align-self: flex-start;
}
.receptor-card__tag--alt {
  color: var(--burgundy);
  background: rgba(146,27,54,.1);
}
.receptor-card--featured .receptor-card__tag { color: rgba(255,255,255,.85); background: rgba(255,255,255,.12); }

.receptor-card__footer { margin-top: auto; }
.receptor-link {
  font-size: .82rem;
  font-weight: 600;
  color: var(--teal);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition), color var(--transition);
}
.receptor-link:hover { gap: 10px; color: var(--navy); }
.receptor-card--featured .receptor-link { color: rgba(255,255,255,.75); }
.receptor-card--featured .receptor-link:hover { color: var(--white); }

/* ════════════════════════════════════════════════════════════
   SCIENCE SECTION
   ════════════════════════════════════════════════════════════ */
.science-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 80px;
}

.science-content { display: flex; flex-direction: column; gap: 28px; }
.science-content h2 { color: var(--white); }
.science-content .section-label { margin-bottom: 0; }

.science-points { display: flex; flex-direction: column; gap: 24px; }
.science-point {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.science-point__icon {
  width: 42px; height: 42px;
  min-width: 42px;
  background: rgba(19,136,160,.18);
  border: 1px solid rgba(19,136,160,.3);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal-light);
  font-size: 1rem;
}
.science-point h4 { color: var(--white); margin-bottom: 4px; }
.science-point p { color: rgba(255,255,255,.68); font-size: .93rem; }

/* Molecule diagram */
.science-visual { display: flex; align-items: center; justify-content: center; }
.molecule-diagram {
  position: relative;
  width: 360px; height: 360px;
}

.mol-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(19,136,160,.25);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: spin linear infinite;
}
.mol-ring--outer { width: 340px; height: 340px; border-style: dashed; animation-duration: 30s; }
.mol-ring--mid   { width: 240px; height: 240px; border-color: rgba(255,255,255,.1); animation-duration: 20s; animation-direction: reverse; }
.mol-ring--inner { width: 140px; height: 140px; border-color: rgba(19,136,160,.35); animation-duration: 12s; }

@keyframes spin { from { transform: translate(-50%,-50%) rotate(0deg); } to { transform: translate(-50%,-50%) rotate(360deg); } }

.mol-center {
  position: absolute;
  width: 50px; height: 50px;
  background: radial-gradient(circle, var(--teal), var(--navy));
  border-radius: 50%;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  box-shadow: 0 0 30px rgba(19,136,160,.5);
}

.mol-node {
  position: absolute;
  width: 64px; height: 64px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(19,136,160,.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
}
.mol-node span {
  font-size: .68rem;
  font-weight: 700;
  color: var(--teal-light);
  letter-spacing: .08em;
}

.mol-node--1 { top: 6%; left: 50%; transform: translateX(-50%); }
.mol-node--2 { bottom: 10%; left: 8%; }
.mol-node--3 { bottom: 10%; right: 8%; }

.mol-line {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, rgba(19,136,160,.6), rgba(19,136,160,.1));
  transform-origin: left center;
}
.mol-line--1 { width: 110px; top: 23%; left: 50%; transform: rotate(62deg); }
.mol-line--2 { width: 110px; top: 50%; left: 28%; transform: rotate(180deg); }
.mol-line--3 { width: 110px; top: 50%; right: 28%; transform: rotate(0deg); }

/* ════════════════════════════════════════════════════════════
   PRODUCT SHOWCASE
   ════════════════════════════════════════════════════════════ */
.product-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.product-image-wrapper {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: linear-gradient(145deg, var(--white), var(--off-white));
}
.product-image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .6s ease;
}
.product-image-wrapper:hover img { transform: scale(1.03); }

.product-image-badge {
  position: absolute;
  bottom: 20px; left: 20px;
  background: rgba(16,40,74,.9);
  color: var(--white);
  font-size: .75rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 50px;
  display: flex;
  align-items: center;
  gap: 7px;
  backdrop-filter: blur(8px);
}
.product-image-badge i { color: var(--teal-light); }

.product-disclaimer {
  margin-top: 16px;
  font-size: .78rem;
  color: var(--gray-400);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.6;
}
.product-disclaimer i { color: var(--burgundy); margin-top: 2px; flex-shrink: 0; }

.product-details { display: flex; flex-direction: column; gap: 16px; }

.product-detail-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 18px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.product-detail-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--teal);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform var(--transition);
  border-radius: 0 3px 3px 0;
}
.product-detail-card--active::before,
.product-detail-card:hover::before { transform: scaleY(1); }
.product-detail-card--active,
.product-detail-card:hover {
  border-color: rgba(19,136,160,.3);
  box-shadow: var(--shadow-md);
}

.pdc-icon {
  width: 44px; height: 44px;
  min-width: 44px;
  background: var(--teal-pale);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal);
  font-size: 1.1rem;
}
.product-detail-card--active .pdc-icon { background: var(--navy); color: var(--teal-light); }

.pdc-body h3 { font-size: 1rem; margin-bottom: 10px; color: var(--navy); }
.pdc-body ul { display: flex; flex-direction: column; gap: 5px; }
.pdc-body li {
  font-size: .85rem;
  color: var(--gray-600);
  padding-left: 14px;
  position: relative;
}
.pdc-body li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-size: .75rem;
}

/* ════════════════════════════════════════════════════════════
   RESEARCH DOCUMENTATION
   ════════════════════════════════════════════════════════════ */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.doc-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--gray-200);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.doc-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.doc-card__icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--teal-pale), rgba(16,40,74,.06));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--navy);
  margin-bottom: 4px;
}
.doc-card h3 { font-size: 1.1rem; }
.doc-card p { font-size: .9rem; color: var(--gray-600); flex: 1; }

.doc-card__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  align-self: flex-start;
  margin-top: 6px;
}
.doc-card__status--pending {
  background: rgba(245,167,36,.1);
  color: #c47a0d;
  border: 1px solid rgba(245,167,36,.25);
}
.doc-card__status--available {
  background: rgba(39,174,96,.08);
  color: #27ae60;
  border: 1px solid rgba(39,174,96,.2);
}
.doc-link { color: #27ae60; text-decoration: underline; }

/* Document viewer */
.doc-viewer {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.doc-viewer__header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
  font-size: .85rem;
  font-weight: 600;
  color: var(--navy);
}
.doc-viewer__badge {
  margin-left: auto;
  font-size: .72rem;
  font-weight: 600;
  color: var(--gray-400);
  background: var(--white);
  padding: 4px 12px;
  border-radius: 50px;
  border: 1px solid var(--gray-200);
}
.doc-viewer__body { padding: 60px 24px; }
.doc-viewer__empty {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.doc-viewer__empty i {
  font-size: 2.5rem;
  color: var(--gray-200);
}
.doc-viewer__empty p { color: var(--gray-400); font-size: .9rem; }

/* ════════════════════════════════════════════════════════════
   RESEARCH LIBRARY
   ════════════════════════════════════════════════════════════ */
.research-categories {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 40px;
}
.research-tab {
  padding: 9px 22px;
  border-radius: 50px;
  font-size: .83rem;
  font-weight: 600;
  color: rgba(255,255,255,.6);
  border: 1px solid rgba(255,255,255,.15);
  transition: all var(--transition);
}
.research-tab:hover { color: var(--white); border-color: rgba(255,255,255,.4); }
.research-tab--active {
  background: var(--teal);
  color: var(--white);
  border-color: var(--teal);
  box-shadow: 0 4px 16px rgba(19,136,160,.35);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.research-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--transition);
}
.research-card:hover {
  background: rgba(255,255,255,.09);
  border-color: rgba(19,136,160,.4);
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(0,0,0,.2);
}
.research-card[style*="display: none"] { display: none !important; }

.research-card__category {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--teal-light);
}
.research-card h3 { color: var(--white); font-size: 1rem; line-height: 1.4; }
.research-card p { color: rgba(255,255,255,.65); font-size: .87rem; flex: 1; }
.research-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,.08);
}
.research-source {
  font-size: .75rem;
  color: rgba(255,255,255,.4);
  display: flex;
  align-items: center;
  gap: 6px;
}
.research-link {
  font-size: .8rem;
  font-weight: 600;
  color: var(--teal-light);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition), color var(--transition);
}
.research-link:hover { gap: 10px; color: var(--white); }

.research-notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-sm);
  padding: 16px 22px;
  font-size: .82rem;
  color: rgba(255,255,255,.55);
}
.research-notice i { color: var(--teal-light); flex-shrink: 0; margin-top: 1px; }

/* ════════════════════════════════════════════════════════════
   FAQ
   ════════════════════════════════════════════════════════════ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.faq-item:has(.faq-question[aria-expanded="true"]),
.faq-item:hover { border-color: rgba(19,136,160,.3); box-shadow: var(--shadow-sm); }

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  text-align: left;
  gap: 16px;
  transition: color var(--transition);
}
.faq-question:hover { color: var(--teal); }

.faq-icon {
  font-size: .8rem;
  color: var(--teal);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-question[aria-expanded="true"] .faq-icon { transform: rotate(180deg); }

.faq-answer {
  padding: 0 26px 22px;
  color: var(--gray-600);
  font-size: .95rem;
  line-height: 1.8;
  animation: faqOpen .3s ease;
}
.faq-answer[hidden] { display: none; }
@keyframes faqOpen { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

/* ════════════════════════════════════════════════════════════
   FOOTER
   ════════════════════════════════════════════════════════════ */
.footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,.8);
}

.footer-container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  padding: 72px 0 56px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.footer-logo { height: 40px; width: auto; margin-bottom: 14px; }
.footer-tagline {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--teal-light);
  margin-bottom: 14px;
}
.footer-description { font-size: .88rem; color: rgba(255,255,255,.5); line-height: 1.8; }

.footer-nav-group h4 {
  font-family: var(--font-sans);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
  margin-bottom: 20px;
  color: var(--white);
}
.footer-nav-group nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav-group a {
  font-size: .88rem;
  color: rgba(255,255,255,.55);
  transition: color var(--transition);
}
.footer-nav-group a:hover { color: var(--teal-light); }

.footer-regulatory {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-regulatory i { color: var(--teal); font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }
.footer-regulatory p { font-size: .82rem; color: rgba(255,255,255,.45); line-height: 1.7; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  font-size: .78rem;
  color: rgba(255,255,255,.3);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-build { font-style: italic; }

/* ════════════════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; gap: 48px; text-align: center; }
  .hero-content { align-items: center; display: flex; flex-direction: column; }
  .hero-body { max-width: 100%; }
  .hero-image-frame { max-width: 500px; margin: 0 auto; }

  .receptor-grid { grid-template-columns: 1fr 1fr; }
  .receptor-card:last-child { grid-column: span 2; max-width: 50%; margin: 0 auto; }

  .science-layout { grid-template-columns: 1fr; gap: 60px; }
  .science-visual { order: -1; }
  .molecule-diagram { width: 300px; height: 300px; }
  .mol-ring--outer { width: 280px; height: 280px; }
  .mol-ring--mid   { width: 200px; height: 200px; }
  .mol-ring--inner { width: 120px; height: 120px; }

  .product-showcase { grid-template-columns: 1fr; }

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

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

  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer-brand { grid-column: span 2; }
}

@media (max-width: 768px) {
  :root { --container: 100%; }

  .section { padding: 72px 0; }

  /* Nav mobile */
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 24px 24px;
    gap: 4px;
    transform: translateY(-110%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-link { padding: 12px 16px; }
  .nav-cta { display: none; }

  .hero { padding: 100px 24px 60px; }
  .hero-actions { justify-content: center; }

  .stats-grid { gap: 0; }
  .stat-item { padding: 12px 20px; }
  .stat-divider { display: none; }

  .receptor-grid { grid-template-columns: 1fr; }
  .receptor-card:last-child { grid-column: auto; max-width: 100%; margin: 0; }

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

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

  .footer-top { grid-template-columns: 1fr; gap: 36px; }
  .footer-brand { grid-column: auto; }

  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  h1 { font-size: 2.6rem; }
  h2 { font-size: 1.8rem; }

  .btn { padding: 12px 22px; font-size: .9rem; }
  .hero-actions { flex-direction: column; align-items: center; }

  .stat-item { padding: 10px 14px; }
  .stat-number { font-size: 1.5rem; }

  .molecule-diagram { width: 240px; height: 240px; }
  .mol-ring--outer { width: 220px; height: 220px; }
  .mol-ring--mid   { width: 155px; height: 155px; }
  .mol-ring--inner { width: 90px; height: 90px; }
  .mol-node { width: 52px; height: 52px; }
  .mol-center { width: 40px; height: 40px; }

  .product-detail-card { flex-direction: column; }

  .faq-question { padding: 18px 20px; font-size: .93rem; }
  .faq-answer { padding: 0 20px 18px; }
}