/* ==========================================================================
   Apexcaliber Editorial & Research Institute - Main Stylesheet
   Established 2009 | Human-Crafted Architecture & Layout
   ========================================================================== */

:root {
  --primary: #1e3a8a;
  --primary-dark: #0f172a;
  --primary-light: #2563eb;
  --secondary: #0f766e;
  --secondary-light: #14b8a6;
  --accent: #b45309;
  --accent-light: #f59e0b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  --success: #15803d;
  --warning: #b45309;
  --danger: #b91c1c;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 30px -6px rgba(0, 0, 0, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-heading: 'Merriweather', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--primary-dark);
  line-height: 1.3;
  font-weight: 700;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* --------------------------------------------------------------------------
   Top Bar & Header
   -------------------------------------------------------------------------- */
.top-notice-bar {
  background: #fef3c7;
  border-bottom: 1px solid #fde68a;
  color: #92400e;
  font-size: 0.8125rem;
  padding: 8px 16px;
  text-align: center;
  font-weight: 500;
}

.top-notice-bar a {
  color: #78350f;
  text-decoration: underline;
  font-weight: 600;
  margin-left: 4px;
}

.top-info-bar {
  background: #0f172a;
  color: #cbd5e1;
  font-size: 0.8125rem;
  border-bottom: 1px solid #1e293b;
  padding: 8px 0;
}

.top-info-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.top-info-list {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  flex-wrap: wrap;
}

.top-info-list li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.top-info-list a {
  color: #cbd5e1;
}

.top-info-list a:hover {
  color: #ffffff;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo img {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--primary-dark);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.brand-subtitle {
  font-size: 0.725rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary);
  font-weight: 600;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-nav ul {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 12px;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #334155;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  position: relative;
  transition: var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--primary);
  background-color: #eff6ff;
}

.btn-header-cta {
  background-color: var(--primary);
  color: #ffffff !important;
  padding: 9px 18px !important;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.btn-header-cta:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--primary-dark);
}

.mobile-nav-panel {
  display: none;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 16px 20px;
}

.mobile-nav-panel.open {
  display: block;
}

.mobile-nav-panel ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-nav-panel a {
  display: block;
  padding: 10px 14px;
  font-weight: 600;
  color: #334155;
  border-radius: var(--radius-md);
}

.mobile-nav-panel a:hover,
.mobile-nav-panel a.active {
  background: #f1f5f9;
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   Hero Section & Editorial Header
   -------------------------------------------------------------------------- */
.hero-editorial {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 65%, #1e293b 100%);
  color: #ffffff;
  padding: 75px 0 65px;
  position: relative;
  overflow: hidden;
}

.hero-editorial::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: radial-gradient(circle at 2px 2px, rgba(255, 255, 255, 0.08) 1px, transparent 0);
  background-size: 28px 28px;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: #93c5fd;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.85rem;
  line-height: 1.2;
  color: #ffffff;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.7;
  color: #cbd5e1;
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--secondary);
  color: #ffffff;
  padding: 13px 26px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.3);
  transition: var(--transition);
}

.btn-primary:hover {
  background-color: #115e59;
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(15, 118, 110, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 13px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border-color: #ffffff;
}

.hero-stats-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-xl);
}

.hero-stats-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.hero-stats-header h3 {
  color: #ffffff;
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.hero-stats-header p {
  color: #94a3b8;
  font-size: 0.8125rem;
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-box {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: #38bdf8;
  font-family: var(--font-heading);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.75rem;
  color: #cbd5e1;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   Trust Strip
   -------------------------------------------------------------------------- */
.trust-strip {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 24px 0;
}

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

.trust-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.trust-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #eff6ff;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.trust-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 2px;
}

.trust-desc {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Section Layouts
   -------------------------------------------------------------------------- */
.section {
  padding: 70px 0;
}

.section-alt {
  background-color: #f1f5f9;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--secondary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.25rem;
  color: var(--primary-dark);
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Article & Guide Cards
   -------------------------------------------------------------------------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.card-editorial {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.card-editorial:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.card-img-wrap {
  position: relative;
  overflow: hidden;
  height: 220px;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card-editorial:hover .card-img-wrap img {
  transform: scale(1.04);
}

.card-category-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(15, 23, 42, 0.85);
  color: #ffffff;
  padding: 4px 10px;
  font-size: 0.725rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  backdrop-filter: blur(4px);
}

.card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.775rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.25rem;
  color: var(--primary-dark);
  margin-bottom: 12px;
  line-height: 1.35;
}

.card-title a {
  color: var(--primary-dark);
}

.card-title a:hover {
  color: var(--primary-light);
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.card-footer-action {
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.read-more-link {
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.read-more-link:hover {
  color: var(--secondary);
  gap: 10px;
}

/* --------------------------------------------------------------------------
   Interactive Nutrient / Health Calculator
   -------------------------------------------------------------------------- */
.calculator-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-lg);
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.95rem;
  background-color: #f8fafc;
  color: var(--text-main);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-light);
  background-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.calc-result-panel {
  background: linear-gradient(145deg, #f8fafc 0%, #edf2f7 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

.calc-result-badge {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--secondary);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.calc-result-value {
  font-size: 3rem;
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.1;
  margin-bottom: 6px;
}

.calc-result-status {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.calc-result-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
  text-align: left;
}

.calc-mini-metric {
  background: #ffffff;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.calc-mini-metric span {
  display: block;
  font-size: 0.725rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.calc-mini-metric strong {
  font-size: 0.95rem;
  color: var(--primary-dark);
}

/* --------------------------------------------------------------------------
   Editorial Standards & Methodology Section
   -------------------------------------------------------------------------- */
.methodology-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.methodology-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 30px;
}

.method-item {
  border-left: 3px solid var(--secondary);
  padding-left: 20px;
}

.method-item h4 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--primary-dark);
}

.method-item p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Interactive FAQ Accordion
   -------------------------------------------------------------------------- */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  background-color: #f8fafc;
}

.faq-chevron {
  font-size: 0.9rem;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  display: none;
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  border-top: 1px solid #f1f5f9;
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* --------------------------------------------------------------------------
   Contact Form & Map
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.contact-details-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.contact-details-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: #eff6ff;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-details-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--primary-dark);
  margin-bottom: 2px;
}

.contact-details-text span,
.contact-details-text a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.map-container {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  height: 280px;
  margin-top: 24px;
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.alert-message {
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  display: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.alert-success {
  background-color: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.alert-error {
  background-color: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* --------------------------------------------------------------------------
   Policy & Legal Content Pages
   -------------------------------------------------------------------------- */
.page-hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  color: #ffffff;
  padding: 55px 0 45px;
  text-align: center;
}

.page-hero h1 {
  color: #ffffff;
  font-size: 2.3rem;
  margin-bottom: 12px;
}

.page-hero p {
  color: #cbd5e1;
  font-size: 1.05rem;
  max-width: 680px;
  margin: 0 auto;
}

.legal-content-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 44px;
  margin: 40px auto 60px;
  max-width: 960px;
  box-shadow: var(--shadow-sm);
}

.legal-content-box h2 {
  font-size: 1.5rem;
  margin-top: 32px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.legal-content-box h3 {
  font-size: 1.2rem;
  margin-top: 24px;
  margin-bottom: 10px;
}

.legal-content-box p {
  margin-bottom: 16px;
  color: #334155;
  line-height: 1.7;
}

.legal-content-box ul,
.legal-content-box ol {
  margin-bottom: 20px;
  padding-left: 24px;
  color: #334155;
}

.legal-content-box li {
  margin-bottom: 8px;
}

.legal-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}

.legal-table th,
.legal-table td {
  border: 1px solid var(--border-color);
  padding: 12px 14px;
  text-align: left;
}

.legal-table th {
  background-color: #f8fafc;
  font-weight: 700;
  color: var(--primary-dark);
}

.badge-official {
  display: inline-block;
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  color: #475569;
}

/* --------------------------------------------------------------------------
   Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 0 24px;
  border-top: 1px solid #1e293b;
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-col p {
  line-height: 1.6;
  margin-bottom: 16px;
  color: #94a3b8;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #cbd5e1;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #38bdf8;
  padding-left: 4px;
}

.footer-legal-badge {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: #cbd5e1;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8125rem;
}

.footer-disclaimer-bar {
  background: #1e293b;
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin-top: 20px;
  font-size: 0.775rem;
  line-height: 1.55;
  color: #94a3b8;
  border-left: 3px solid #f59e0b;
}

/* --------------------------------------------------------------------------
   Back to Top
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--secondary);
  transform: translateY(-3px);
}

/* --------------------------------------------------------------------------
   Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .methodology-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .site-nav {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .trust-grid {
    grid-template-columns: 1fr;
  }
  .legal-content-box {
    padding: 24px 18px;
  }
}