:root {
  --primary-color: #1A1A1A;
  --accent-cyan: #00E5FF;
  --accent-linen: #FAF0E6;
  --accent-jade: #00A896;
  --text-primary: #1A1A1A;
  --text-light: #666666;
  --border-light: #E8E8E8;
  --white: #FFFFFF;
  --light-gray: #F5F5F5;
}

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

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  font-size: 18px;
  line-height: 1.85;
  color: var(--text-primary);
  background-color: var(--white);
}

main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

header.fixed-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: transparent;
  border: none;
  z-index: 1000;
  transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
}

header.fixed-header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar {
  padding: 1.5rem 0 !important;
}

.navbar-brand {
  font-size: 24px;
  font-weight: 600;
  color: var(--primary-color) !important;
  letter-spacing: 1px;
}

.navbar-light .navbar-nav .nav-link {
  color: var(--text-primary) !important;
  font-size: 16px;
  margin-left: 2rem;
  transition: color 0.3s ease;
  position: relative;
}

.navbar-light .navbar-nav .nav-link:hover {
  color: var(--accent-cyan) !important;
}

.container {
  max-width: 1100px !important;
}

h1 {
  font-size: 58px;
  font-weight: 300;
  letter-spacing: 2px;
  line-height: 1.2;
  margin-bottom: 2rem;
  color: var(--primary-color);
  text-align: center;
}

h2 {
  font-size: 42px;
  font-weight: 400;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  position: relative;
  padding-bottom: 1rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background-color: var(--accent-cyan);
}

h3 {
  font-size: 24px;
  font-weight: 500;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

h4 {
  font-size: 20px;
  font-weight: 500;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
}

h5 {
  font-size: 18px;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

p {
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  line-height: 1.85;
  letter-spacing: 0.3px;
}

.intro-text {
  font-size: 20px;
  color: var(--text-light);
  margin-bottom: 2.5rem;
}

.hero-section {
  width: 100%;
  margin-bottom: 5rem;
  overflow: hidden;
}

.hero-image {
  width: 100%;
  height: auto;
  display: block;
  max-height: 600px;
  object-fit: cover;
}

.page-section {
  padding: 4rem 0;
}

.understanding-nutrients,
.essential-elements-table,
.products-showcase,
.iodine-sources,
.copper-natural-diet,
.manganese-facts,
.vitamin-a-sources,
.trace-minerals-overview,
.bioavailability-notes,
.food-processing-impact,
.variety-in-diet,
.scientific-references,
.disclaimer-block,
.final-cta {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border-light);
}

.final-cta {
  border-bottom: none;
}

.essential-elements-table .table {
  border-collapse: collapse;
  margin-top: 2rem;
  background-color: var(--white);
}

.essential-elements-table .table th {
  background-color: var(--light-gray);
  border-top: 2px solid var(--primary-color);
  border-bottom: 2px solid var(--primary-color);
  color: var(--primary-color);
  font-weight: 600;
  padding: 1rem;
  text-align: left;
}

.essential-elements-table .table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
}

.essential-elements-table .table tbody tr:hover {
  background-color: var(--accent-linen);
}

.product-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 4rem;
  padding: 2rem 0;
}

.product-row:last-child {
  margin-bottom: 0;
}

.product-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.product-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 0;
}

.product-text h3 {
  margin-top: 0;
}

.nutrient-list,
.reference-list,
.footer-links {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.nutrient-list li,
.reference-list li,
.footer-links li {
  padding-left: 2rem;
  margin-bottom: 1rem;
  position: relative;
  line-height: 1.8;
}

.nutrient-list li::before,
.reference-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: 600;
}

.section-image {
  width: 100%;
  max-width: 600px;
  height: auto;
  display: block;
  margin: 2rem auto;
}

.mineral-card {
  background-color: var(--light-gray);
  padding: 2rem;
  border-radius: 0;
  transition: background-color 0.3s ease;
}

.mineral-card h4 {
  margin-top: 0;
  color: var(--accent-jade);
}

.mineral-card:hover {
  background-color: var(--accent-linen);
}

.mineral-image {
  width: 100%;
  height: auto;
  display: block;
}

.disclaimer-box {
  background-color: var(--light-gray);
  border-left: 4px solid var(--accent-cyan);
  padding: 2rem;
  margin: 2rem 0;
  border-radius: 0;
}

.disclaimer-box h3 {
  margin-top: 0;
  color: var(--accent-jade);
}

.disclaimer-box p:last-child {
  margin-bottom: 0;
}

.faq-item {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-light);
}

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

.faq-item h3 {
  margin-top: 0;
  color: var(--accent-jade);
  font-size: 20px;
}

.contact-info {
  background-color: var(--light-gray);
  padding: 2rem;
  border-radius: 0;
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group label {
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 16px;
}

.form-control {
  border: 1px solid var(--border-light);
  border-radius: 0;
  padding: 0.75rem;
  font-size: 16px;
  background-color: var(--white);
  color: var(--text-primary);
}

.form-control:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 0.2rem rgba(0, 229, 255, 0.25);
}

.btn {
  border-radius: 0;
  padding: 0.75rem 2rem;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: all 0.3s ease;
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--accent-cyan);
  color: var(--primary-color);
  box-shadow: none;
}

.cta-button {
  display: inline-block;
  background-color: transparent;
  color: var(--primary-color);
  padding: 0.75rem 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-decoration: underline;
  text-decoration-color: var(--accent-cyan);
  text-underline-offset: 6px;
  transition: all 0.3s ease;
}

.cta-button:hover {
  color: var(--accent-cyan);
  text-decoration-color: var(--primary-color);
}

.cta-text {
  font-size: 20px;
  color: var(--text-light);
  margin-bottom: 2rem;
}

footer {
  background-color: var(--light-gray);
  padding: 3rem 0 2rem;
  margin-top: 5rem;
  border-top: 1px solid var(--border-light);
}

footer h5 {
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
}

footer p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

footer a:hover {
  color: var(--accent-cyan);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  padding-left: 0;
  margin-bottom: 0.5rem;
}

.footer-links li::before {
  content: '';
}

.footer-copyright {
  font-size: 12px;
  color: var(--text-light);
  margin: 0;
}

@media (max-width: 768px) {
  main {
    margin-top: 70px;
  }

  h1 {
    font-size: 36px;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
  }

  h2 {
    font-size: 28px;
    margin-top: 2rem;
    margin-bottom: 1rem;
  }

  h3 {
    font-size: 20px;
  }

  p {
    font-size: 16px;
  }

  .product-row {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .navbar-light .navbar-nav .nav-link {
    margin-left: 0;
    padding: 0.75rem 0;
  }

  .container {
    padding: 0 1.5rem;
  }

  .understanding-nutrients,
  .essential-elements-table,
  .products-showcase,
  .iodine-sources,
  .copper-natural-diet,
  .manganese-facts,
  .vitamin-a-sources,
  .trace-minerals-overview,
  .bioavailability-notes,
  .food-processing-impact,
  .variety-in-diet,
  .scientific-references,
  .disclaimer-block,
  .final-cta {
    padding: 3rem 0;
  }

  .page-section {
    padding: 2rem 0;
  }
}

@media (max-width: 576px) {
  h1 {
    font-size: 28px;
    letter-spacing: 0.5px;
  }

  h2 {
    font-size: 22px;
  }

  .table {
    font-size: 14px;
  }

  .table th, .table td {
    padding: 0.75rem 0.5rem;
  }

  .hero-image {
    max-height: 400px;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section {
  animation: fadeIn 0.6s ease-out;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-cyan);
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

ul, ol {
  margin-bottom: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}