/* ============================================
   CPPB Inc. Website Styles (2025 Redesign)
   ============================================ */

:root {
  --color-primary: #00a652;
  --color-primary-dark: #008143;
  --color-primary-light: #33c67a;
  --color-secondary: #00bfff;
  --color-secondary-dark: #0095d4;
  --color-secondary-light: #66d9ff;
  --color-accent: #f04f36;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-surface-dark: #0d1c2f;
  --color-surface-mid: #13263d;
  --color-border: rgba(19, 38, 61, 0.12);
  --color-border-strong: rgba(19, 38, 61, 0.24);
  --color-text: #102031;
  --color-text-light: rgba(16, 32, 49, 0.64);
  --color-text-inverse: #f8fafc;
  --font-sans: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Montserrat", "Segoe UI", sans-serif;
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --shadow-sm: 0 6px 18px rgba(13, 28, 47, 0.08);
  --shadow-lg: 0 34px 68px rgba(13, 28, 47, 0.12);
  --transition-fast: 150ms ease;
  --transition: 300ms ease;
  --section-padding: 96px;
}

body.theme-dark {
  --color-surface: #0b1728;
  --color-surface-alt: #101e33;
  --color-text: #e2eaf5;
  --color-text-light: rgba(226, 234, 245, 0.7);
  --color-border: rgba(226, 234, 245, 0.12);
  --color-border-strong: rgba(226, 234, 245, 0.2);
  --shadow-sm: 0 6px 18px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 34px 68px rgba(0, 0, 0, 0.38);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-surface);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

p {
  margin: 0 0 1.25rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 999;
  padding: 12px 16px;
  background: var(--color-secondary);
  color: #0b1728;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: min(90%, var(--max-width));
  margin: 0 auto;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.section-light {
  background: var(--color-surface);
}

.section-dark {
  background: var(--color-surface-mid);
  color: var(--color-text-inverse);
}

.section-gradient {
  background: linear-gradient(135deg, rgba(0, 166, 82, 0.12), rgba(0, 191, 255, 0.16));
}

.section-covid {
  background: radial-gradient(circle at 10% 10%, rgba(0, 191, 255, 0.2), transparent 40%),
              radial-gradient(circle at 90% 20%, rgba(0, 166, 82, 0.14), transparent 42%),
              var(--color-surface);
}

.section-header {
  display: grid;
  gap: 24px;
  margin-bottom: 48px;
  align-items: center;
}

.section-eyebrow,
.eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 600;
}

h1,
h2,
h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 600;
}

h1 {
  font-size: clamp(2.75rem, 5vw, 3.6rem);
}

h2 {
  font-size: clamp(2.1rem, 4vw, 2.8rem);
}

h3 {
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 22px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-secondary);
  color: #041424;
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--color-secondary-dark);
  transform: translateY(-1px);
}

.btn-outline {
  border: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--color-text);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-small {
  padding: 10px 16px;
  font-size: 0.92rem;
}

.inline-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--color-primary);
}

.inline-link::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.inline-link:hover::after {
  transform: translateX(4px);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(22px);
  border-bottom: 1px solid var(--color-border);
}

body.theme-dark .site-header {
  background: rgba(11, 23, 40, 0.92);
}

.header-inner {
  padding: 18px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--color-text);
  font-weight: 700;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: 18px;
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
}

.logo-text strong {
  display: block;
  line-height: 1.2;
}

.logo-text small {
  color: var(--color-text-light);
  font-size: 0.85rem;
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  background: var(--color-surface);
}

.language-toggle .lang-option {
  padding: 6px 10px;
  font-size: 0.9rem;
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

.language-toggle .lang-option:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.language-toggle .lang-option.active {
  color: var(--color-text);
  font-weight: 600;
}

.theme-toggle {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

.menu-toggle {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
}

.primary-nav {
  border-top: 1px solid transparent;
}

.primary-nav ul {
  display: flex;
  justify-content: center;
  gap: 18px;
  list-style: none;
  padding: 12px 0 18px;
  margin: 0;
}

.primary-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-light);
  font-weight: 600;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.primary-nav a.active {
  color: var(--color-primary);
  background: rgba(0, 166, 82, 0.12);
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--color-primary);
  background: rgba(0, 166, 82, 0.08);
}

body.theme-dark .primary-nav a:hover,
body.theme-dark .primary-nav a:focus-visible {
  background: rgba(0, 191, 255, 0.12);
}

/* Subpage hero & layout */
.subpage-hero {
  background: linear-gradient(140deg, #0b2136, #103555);
  color: var(--color-text-inverse);
  padding: 110px 0 80px;
  position: relative;
  overflow: hidden;
}

.subpage-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 191, 255, 0.18), transparent 55%),
    radial-gradient(circle at 80% 60%, rgba(0, 166, 82, 0.16), transparent 60%);
  pointer-events: none;
}

.subpage-hero .container {
  position: relative;
  z-index: 1;
}

.breadcrumb {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(248, 250, 252, 0.7);
  margin-bottom: 18px;
}

.subpage-hero h1 {
  margin-bottom: 18px;
}

.subpage-hero p {
  max-width: 720px;
  color: rgba(248, 250, 252, 0.82);
  font-size: 1.05rem;
}

.subpage-section {
  padding-top: 56px;
  padding-bottom: 56px;
}

.subpage-section .section-intro {
  max-width: 700px;
  margin-bottom: 32px;
  color: var(--color-text-light);
}

.info-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.info-card h3 {
  margin-bottom: 12px;
}

.pillar-list {
  display: grid;
  gap: 18px;
  margin-top: 24px;
  list-style: none;
  padding: 0;
}

.pillar-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  box-shadow: var(--shadow-sm);
}

.detail-section {
  background: linear-gradient(135deg, rgba(0, 166, 82, 0.08), rgba(0, 191, 255, 0.12));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 36px;
  display: grid;
  gap: 22px;
}

.detail-section ul {
  margin: 0;
  padding-left: 20px;
  color: var(--color-text-light);
}

/* Subpage nav */
.subpage-nav {
  background: linear-gradient(90deg, rgba(0, 166, 82, 0.08), rgba(0, 191, 255, 0.08));
  border-bottom: 1px solid var(--color-border);
}

.subpage-nav ul {
  margin: 0;
  padding: 12px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: center;
  list-style: none;
}

.subpage-nav a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-text-light);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.subpage-nav a:hover,
.subpage-nav a:focus-visible {
  color: var(--color-primary);
  background: rgba(0, 166, 82, 0.12);
}

body.theme-dark .subpage-nav a {
  color: rgba(226, 234, 245, 0.78);
}

.subpage-nav a[aria-current="page"] {
  background: rgba(0, 166, 82, 0.18);
  color: var(--color-primary);
}

body.theme-dark .subpage-nav {
  background: linear-gradient(90deg, rgba(0, 191, 255, 0.1), rgba(0, 166, 82, 0.1));
  border-color: rgba(226, 234, 245, 0.12);
}

/* Hero */

.hero-section {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, #0b2136, #103555);
  color: var(--color-text-inverse);
  padding: 120px 0 110px;
}

body.theme-dark .hero-section {
  background: linear-gradient(150deg, #09172a, #0c2842);
}

.double-helix {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.12) 0, transparent 60%),
    radial-gradient(circle at 80% 10%, rgba(0, 191, 255, 0.16) 0, transparent 60%);
  pointer-events: none;
}

.double-helix::before,
.double-helix::after {
  content: "";
  position: absolute;
  top: -20%;
  bottom: -20%;
  width: 120%;
  left: -10%;
  background:
    repeating-linear-gradient(
      120deg,
      rgba(255, 255, 255, 0.06) 0,
      rgba(255, 255, 255, 0.06) 10px,
      transparent 10px,
      transparent 32px
    );
  transform: skewY(-12deg);
  animation: helixFlow 28s linear infinite;
}

.double-helix::after {
  animation-direction: reverse;
  opacity: 0.4;
}

@keyframes helixFlow {
  from {
    transform: translateY(-10%) skewY(-12deg);
  }
  to {
    transform: translateY(10%) skewY(-12deg);
  }
}

.hero-content {
  display: grid;
  gap: 64px;
  position: relative;
  z-index: 1;
}

.hero-text {
  max-width: 620px;
}

.hero-cta {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.hero-text p {
  color: rgba(248, 250, 252, 0.82);
  font-size: 1.1rem;
}

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.badge {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(248, 250, 252, 0.22);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
}

.hero-stats article {
  background: rgba(15, 33, 52, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 40px rgba(5, 10, 15, 0.26);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2.6rem;
  margin-bottom: 6px;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.stat-label {
  margin: 0;
  color: rgba(248, 250, 252, 0.7);
  font-size: 0.95rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.5;
}

/* Pipeline */

.pipeline-timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.timeline-card {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.timeline-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.timeline-card ul {
  padding-left: 18px;
  margin: 16px 0 0;
  color: var(--color-text-light);
}

.pipeline-highlights {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(0, 166, 82, 0.1), rgba(0, 191, 255, 0.1));
  border: 1px solid var(--color-border);
}

.pipeline-highlights h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
}

/* Products */

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.product-card ul {
  padding-left: 18px;
  margin: 0;
  color: var(--color-text-light);
}

.product-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

/* Innovation */

.innovation-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.innovation-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.molecule-viewer {
  height: 220px;
  margin: 16px 0 24px;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 30% 30%, rgba(0, 191, 255, 0.18), transparent 62%),
              radial-gradient(circle at 70% 70%, rgba(0, 166, 82, 0.14), transparent 70%),
              var(--color-surface-alt);
  position: relative;
  overflow: hidden;
}

.molecule-orbit {
  position: absolute;
  inset: 10%;
  border-radius: 50%;
  border: 1px dashed rgba(0, 191, 255, 0.4);
  animation: rotateMolecule 12s linear infinite;
}

.molecule-orbit .atom {
  position: absolute;
  border-radius: 50%;
  background: var(--color-secondary);
  width: 18px;
  height: 18px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.molecule-orbit .core {
  width: 26px;
  height: 26px;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
  box-shadow: 0 0 18px rgba(0, 191, 255, 0.35);
}

.molecule-orbit .satellite {
  top: 12%;
  left: 48%;
  animation: satelliteOrbit 7s ease-in-out infinite alternate;
}

.molecule-orbit .satellite.delayed {
  top: 70%;
  left: 80%;
  background: var(--color-primary);
  animation-delay: -2.5s;
}

.molecule-orbit .orbit-path,
.molecule-orbit .orbit-path.secondary {
  position: absolute;
  inset: 4%;
  border-radius: 50%;
  border: 1px solid rgba(0, 166, 82, 0.22);
}

.molecule-orbit .orbit-path.secondary {
  inset: 20%;
  border-style: dashed;
}

@keyframes rotateMolecule {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes satelliteOrbit {
  from {
    transform: translate(-50%, -50%);
  }
  to {
    transform: translate(-50%, -120%);
  }
}

/* Clinical */

.clinical-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
}

.clinical-summary {
  display: grid;
  gap: 24px;
}

.clinical-summary article {
  background: rgba(17, 35, 57, 0.5);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.clinical-form {
  background: #ffffff;
  color: #08121f;
  border-radius: var(--radius-lg);
  padding: 32px;
  display: grid;
  gap: 14px;
}

.clinical-form label {
  font-weight: 600;
  font-size: 0.95rem;
}

.clinical-form input,
.clinical-form select,
.clinical-form textarea {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(16, 32, 49, 0.16);
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
}

.clinical-form textarea {
  resize: vertical;
  min-height: 130px;
}

.clinical-form .is-invalid {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(240, 79, 54, 0.15);
}

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
}

.form-footer label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 500;
}

/* COVID */

.covid-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
}

.covid-list {
  padding-left: 20px;
  color: var(--color-text-light);
}

.covid-insights {
  display: grid;
  gap: 18px;
  background: var(--color-surface);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

/* News */

.news-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.news-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.news-date {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

/* Investors */

.investor-grid {
  display: grid;
  gap: 32px;
}

.investor-panels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.investor-panels article {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.investor-panels article h3 {
  margin-bottom: 14px;
}

.investor-panels ul {
  padding-left: 18px;
  color: var(--color-text-light);
}

.investor-cta {
  display: flex;
  gap: 18px;
  align-items: center;
}

/* Contact */

.contact-grid {
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr 1fr;
}

.contact-details p {
  color: rgba(248, 250, 252, 0.8);
}

.map-embed {
  background: rgba(17, 34, 53, 0.6);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.map-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}

.map-cell {
  padding-top: 100%;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
}

.map-cell.highlight {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
}

.map-note {
  font-size: 0.9rem;
  color: rgba(248, 250, 252, 0.72);
}

/* Footer */

.site-footer {
  background: #06111e;
  color: rgba(248, 250, 252, 0.86);
  padding: 70px 0 28px;
}

.footer-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 42px;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
  color: rgba(248, 250, 252, 0.7);
}

.footer-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-form input {
  border-radius: var(--radius-sm);
  border: none;
  padding: 12px 14px;
  flex: 1;
  min-width: 180px;
}

.footer-bottom {
  border-top: 1px solid rgba(248, 250, 252, 0.12);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-social {
  display: flex;
  gap: 18px;
}

.footer-social a {
  color: rgba(248, 250, 252, 0.72);
  font-weight: 600;
}

/* Scroll To Top */

.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
  z-index: 120;
}

.scroll-to-top:hover {
  transform: translateY(-3px);
}

/* Dark Theme Refinements */

body.theme-dark .primary-nav a.active {
  background: rgba(0, 191, 255, 0.18);
  color: var(--color-secondary);
}

body.theme-dark .hero-stats article {
  background: rgba(12, 27, 43, 0.76);
  border-color: rgba(255, 255, 255, 0.16);
}

body.theme-dark .product-card,
body.theme-dark .innovation-card,
body.theme-dark .news-card,
body.theme-dark .pipeline-timeline .timeline-card,
body.theme-dark .investor-panels article,
body.theme-dark .covid-insights {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

body.theme-dark .product-card,
body.theme-dark .innovation-card,
body.theme-dark .news-card,
body.theme-dark .investor-panels article {
  border-color: rgba(226, 234, 245, 0.12);
}

body.theme-dark .clinical-form {
  background: #f8fafc;
  color: #0b1a2d;
  border: 1px solid rgba(16, 32, 49, 0.16);
}

/* Reveal Animations */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms ease, transform 600ms ease;
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Responsive */

@media (max-width: 1100px) {
  .card-grid,
  .pipeline-timeline,
  .innovation-grid,
  .investor-panels,
  .news-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-grid,
  .clinical-layout,
  .covid-grid {
    grid-template-columns: 1fr;
  }

  .hero-content {
    gap: 48px;
  }
}

@media (max-width: 900px) {
  :root {
    --section-padding: 78px;
  }

  .header-inner {
    padding: 14px 0;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .primary-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .primary-nav.active {
    max-height: 420px;
    border-top: 1px solid var(--color-border);
  }

  .primary-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 6%;
    gap: 6px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pipeline-highlights {
    grid-template-columns: 1fr;
  }

  .investor-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  :root {
    --section-padding: 64px;
  }

  .container {
    width: min(92%, 520px);
  }

  .header-inner {
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }

  .header-actions {
    align-self: flex-end;
  }

  .hero-content {
    gap: 36px;
  }

  .hero-cta {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .timeline-card,
  .product-card,
  .innovation-card,
  .news-card,
  .clinical-summary article {
    padding: 24px;
  }

  .card-grid,
  .pipeline-timeline,
  .innovation-grid,
  .investor-panels,
  .news-grid {
    grid-template-columns: 1fr;
  }

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

  .subpage-nav ul {
    padding: 10px 4%;
    gap: 8px 12px;
  }

  .subpage-nav a {
    font-size: 0.85rem;
  }
}