/* ==========================================================================
   EURO PRIME GUIDE — DESIGN DNA: D-0128E2-01 (archetype-content-sales-funnel)
   Layout: layout-centered-modular | Nav: nav-minimal-centered | Hero: hero-text-first
   Typography: type-large-modern-sans | Color: color-warm-sand | Density: density-dense
   Card: cards-bordered | Section: sections-storytelling
   ========================================================================== */

/* 1. CSS Custom Properties / Tokens */
:root {
  /* Typography Tokens */
  --font-sans: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, 'Times New Roman', serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Color Palette: color-warm-sand */
  --color-bg: #FAF6F0;
  --color-surface: #FFFFFF;
  --color-text-primary: #332D27;
  --color-text-secondary: #736B63;
  --color-accent: #D97706;
  --color-border: #EBE3D5;
  --color-muted-bg: #F3EBE1;
  --color-interactive: #B45309;

  /* Additional functional tokens */
  --color-success: #15803D;
  --color-success-bg: #F0FDF4;
  --color-warning-bg: #FEF3C7;
  --color-badge-bg: #EAE0D0;

  /* Layout Constraints */
  --max-width-content: 1180px;
  --max-width-reading: 780px;
  --max-width-form: 640px;

  /* Spacing Tokens (Dense profile) */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-section: 64px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* 2. Global Resets & Bulletproof Rules */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow-x: hidden;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 1.125rem;
  line-height: 1.5;
  font-weight: 400;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-accent);
  color: #FFFFFF;
  padding: 10px 18px;
  z-index: 9999;
  text-decoration: none;
  font-weight: 700;
  border-radius: 0 0 4px 4px;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* 3. Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  margin-top: 0;
  margin-bottom: var(--space-md);
  letter-spacing: -0.025em;
  font-weight: 800;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.75rem);
  line-height: 1.15;
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  line-height: 1.25;
}

h4 {
  font-size: 1.2rem;
  line-height: 1.35;
}

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
  line-height: 1.6;
  max-width: 72ch;
}

a {
  color: var(--color-interactive);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

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

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 4. Semantic Global Layout Selectors */
header {
  width: 100%;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0 var(--space-md);
}

nav {
  max-width: var(--max-width-content);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.brand-link {
  font-size: 1.25rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--color-text-primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.02em;
}

.brand-link svg {
  width: 24px;
  height: 24px;
  fill: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.nav-links li a {
  text-decoration: none;
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-links li a:hover,
.nav-links li a.active {
  background-color: var(--color-muted-bg);
  color: var(--color-interactive);
}

/* Standout Header Order CTA */
.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: #FFFFFF !important;
  font-weight: 700 !important;
  padding: 10px 18px !important;
  border-radius: 4px;
  text-decoration: none !important;
  min-height: 44px;
  min-width: 44px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.nav-cta-btn:hover {
  background-color: var(--color-interactive);
  transform: translateY(-1px);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  font-size: 1rem;
  cursor: pointer;
  color: var(--color-text-primary);
  border-radius: 4px;
  min-height: 44px;
  min-width: 44px;
}

/* Main Element */
main {
  width: 100%;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Sections System */
section {
  padding: var(--space-section) 0;
  width: 100%;
}

section.section-alt {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  padding-left: calc(50vw - 50% + var(--space-md));
  padding-right: calc(50vw - 50% + var(--space-md));
}

section.section-muted {
  background-color: var(--color-muted-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  padding-left: calc(50vw - 50% + var(--space-md));
  padding-right: calc(50vw - 50% + var(--space-md));
}

/* Hero Section: Hero Text First */
.hero-text-first {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 2px solid var(--color-border);
}

.hero-tag {
  display: inline-block;
  font-size: 0.85rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-interactive);
  background: var(--color-muted-bg);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: var(--space-sm);
  border: 1px solid var(--color-border);
}

.hero-lede {
  font-size: 1.35rem;
  line-height: 1.5;
  color: var(--color-text-primary);
  font-weight: 500;
  max-width: 820px;
  margin-bottom: var(--space-lg);
}

/* Footer System: footer-minimal */
footer {
  width: 100%;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding: var(--space-lg) var(--space-md);
  margin-top: var(--space-2xl);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.footer-inner {
  max-width: var(--max-width-content);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-interactive);
  text-decoration: underline;
}

/* 5. Common Component Systems */

/* Cards System: Cards Bordered */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-md) var(--space-md);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  border-color: var(--color-accent);
}

.card-number {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-interactive);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  border-bottom: none;
  padding-bottom: 0;
}

.card-text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-sm);
  flex-grow: 1;
}

.card-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-interactive);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}

.card-link:hover {
  text-decoration: underline;
}

/* Callout Box / Inset Block */
.callout {
  background-color: var(--color-muted-bg);
  border-left: 4px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  border-radius: 0 4px 4px 0;
}

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

/* Article Reading System */
article {
  max-width: var(--max-width-reading);
  margin: 0 auto;
  padding: var(--space-lg) 0;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.toc-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  border-radius: 4px;
}

.toc-box h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-xs);
  border: none;
}

.toc-box ol {
  margin: 0;
  padding-left: 20px;
}

.toc-box li {
  margin-bottom: 6px;
  font-size: 0.95rem;
}

/* Pull quote */
blockquote {
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-interactive);
  background-color: var(--color-surface);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--color-text-primary);
}

/* Comparison Table */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin: var(--space-lg) 0;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background-color: var(--color-surface);
  min-width: 600px;
}

th, td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-muted-bg);
  font-weight: 700;
  color: var(--color-text-primary);
}

tr:last-child td {
  border-bottom: none;
}

/* Conversion Bridge Block (Блок-міст) — MANDATORY ON ALL ARTICLES */
.conversion-bridge-block {
  background: linear-gradient(135deg, #FFFFFF 0%, var(--color-muted-bg) 100%);
  border: 2px solid var(--color-accent);
  border-radius: 6px;
  padding: var(--space-xl) var(--space-lg);
  margin: var(--space-2xl) 0;
  text-align: left;
}

.bridge-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #FFFFFF;
  background-color: var(--color-interactive);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: var(--space-sm);
}

.bridge-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
  border: none;
}

.bridge-text {
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  max-width: 70ch;
}

.bridge-highlights {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-lg) 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-sm);
}

.bridge-highlights li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-primary);
}

.bridge-highlights svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  fill: var(--color-success);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background-color: var(--color-accent);
  color: #FFFFFF !important;
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none !important;
  padding: 14px 28px;
  border-radius: 4px;
  min-height: 48px;
  min-width: 44px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary:hover {
  background-color: var(--color-interactive);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  color: var(--color-text-primary) !important;
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none !important;
  padding: 12px 24px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  min-height: 44px;
  min-width: 44px;
  transition: border-color var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--color-interactive);
}

/* Checklists & Lists */
.checklist-module {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
}

.checklist-module li {
  position: relative;
  padding-left: 32px;
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}

.checklist-module li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 800;
  color: var(--color-accent);
  font-size: 1.15rem;
}

/* Order Page Styles */
.order-hero-container {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--space-xl);
  align-items: center;
  margin: var(--space-lg) 0;
}

.product-image-frame {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-md);
  text-align: center;
}

.product-image-frame img {
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: 4px;
  display: block;
  margin: 0 auto;
}

.pricing-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.pricing-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-lg) var(--space-md);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast);
}

.pricing-card.featured {
  border-color: var(--color-accent);
  background: #FFFDF9;
}

.pricing-badge {
  position: absolute;
  top: -12px;
  right: 16px;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 3px;
  text-transform: uppercase;
}

.package-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: var(--space-xs);
}

.package-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin: var(--space-sm) 0;
  line-height: 1;
}

.package-price span {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.package-savings {
  display: inline-block;
  background-color: var(--color-warning-bg);
  color: var(--color-interactive);
  padding: 4px 8px;
  border-radius: 3px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

/* Order Form */
.checkout-form-container {
  max-width: var(--max-width-form);
  margin: var(--space-xl) auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 6px;
  color: var(--color-text-primary);
}

.form-control {
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

.form-control:focus {
  border-color: var(--color-accent);
  background-color: #FFFFFF;
}

.form-help {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: var(--space-md) 0;
}

.form-checkbox input {
  margin-top: 4px;
  width: 18px;
  height: 18px;
}

/* Interactive Checklist Tool */
.interactive-quiz {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  border-radius: 6px;
  margin: var(--space-lg) 0;
}

.quiz-item {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.quiz-item label {
  cursor: pointer;
  font-size: 1.05rem;
}

.quiz-result-box {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background-color: var(--color-muted-bg);
  border-radius: 4px;
  display: none;
}

/* Guarantees & Badges Grid */
.trust-badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.trust-badge-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  border-radius: 4px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.trust-badge-item svg {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  fill: var(--color-interactive);
}

/* FAQ Details/Summary */
details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  margin-bottom: var(--space-sm);
  padding: var(--space-md);
  transition: border-color var(--transition-fast);
}

details[open] {
  border-color: var(--color-accent);
}

summary {
  font-weight: 700;
  font-size: 1.15rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--color-interactive);
  font-weight: 800;
}

details[open] summary::after {
  content: "−";
}

details p {
  margin-top: var(--space-sm);
  color: var(--color-text-secondary);
}

/* 6. Responsive Breakpoint Rules (Mobile Large Type) */
@media (max-width: 900px) {
  .order-hero-container {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  .mobile-nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md) 0;
    border-top: 1px solid var(--color-border);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links li a {
    display: block;
    padding: 10px 0;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-cta-btn {
    width: 100%;
    margin-top: var(--space-xs);
  }

  h1 {
    font-size: 2.3rem;
  }

  h2 {
    font-size: 1.8rem;
  }

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

@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;
  }
}

/* ==========================================================================
   7. ACCESSIBILITY & LOW VISION MODES (Версия для слабовидящих)
   - Font size controls: Normal (100%), Large (125%), Extra Large (150%)
   - Themes: Standard (Warm Sand), High Contrast (Black on White), Inverted (White on Black), Yellow on Black, Blue/Soft
   - Letter-spacing & Line-height controls
   - Image hide/show toggle
   ========================================================================== */

/* Accessibility Top Toolbar */
.a11y-toolbar {
  background-color: #1F2937;
  color: #F9FAFB;
  padding: 8px 16px;
  border-bottom: 2px solid #374151;
  font-size: 0.9rem;
}

.a11y-toolbar-inner {
  max-width: var(--max-width-content);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.a11y-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.a11y-group-label {
  font-weight: 700;
  font-size: 0.85rem;
  margin-right: 4px;
  color: #D1D5DB;
}

.a11y-btn {
  background: #374151;
  color: #FFFFFF;
  border: 1px solid #4B5563;
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 38px;
  min-width: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.a11y-btn:hover {
  background: #4B5563;
  border-color: #9CA3AF;
}

.a11y-btn.active, .a11y-btn[aria-pressed="true"] {
  background: #D97706;
  border-color: #F59E0B;
  color: #FFFFFF;
}

.a11y-btn:focus-visible {
  outline: 3px solid #F59E0B;
  outline-offset: 2px;
}

/* Language Switcher in Header */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  background-color: var(--color-muted-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  padding: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  padding: 6px 12px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  border-radius: 3px;
  min-height: 36px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.lang-btn.active, .lang-btn[aria-current="true"] {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

/* Font Size Modifiers */
body.font-size-large {
  font-size: 1.35rem !important;
  line-height: 1.7 !important;
}

body.font-size-large h1 { font-size: clamp(2.8rem, 6vw, 4.6rem) !important; }
body.font-size-large h2 { font-size: clamp(2.2rem, 4.5vw, 3.2rem) !important; }
body.font-size-large h3 { font-size: clamp(1.6rem, 3.2vw, 2.2rem) !important; }
body.font-size-large p, body.font-size-large li { font-size: 1.35rem !important; line-height: 1.7 !important; }

body.font-size-xlarge {
  font-size: 1.6rem !important;
  line-height: 1.85 !important;
  letter-spacing: 0.03em !important;
}

body.font-size-xlarge h1 { font-size: clamp(3.2rem, 7vw, 5.2rem) !important; }
body.font-size-xlarge h2 { font-size: clamp(2.5rem, 5vw, 3.8rem) !important; }
body.font-size-xlarge h3 { font-size: clamp(1.85rem, 3.8vw, 2.6rem) !important; }
body.font-size-xlarge p, body.font-size-xlarge li { font-size: 1.6rem !important; line-height: 1.85 !important; }
body.font-size-xlarge .btn-primary, body.font-size-xlarge .btn-secondary { font-size: 1.35rem !important; padding: 18px 36px !important; }

/* Letter Spacing Modifier */
body.spacing-wide {
  letter-spacing: 0.08em !important;
  word-spacing: 0.15em !important;
}
body.spacing-wide p, body.spacing-wide li, body.spacing-wide a, body.spacing-wide span {
  letter-spacing: 0.08em !important;
}

/* Hide Images Mode for Low Vision Screen Magnifiers */
body.hide-images img,
body.hide-images .product-image-frame img {
  display: none !important;
}
body.hide-images .product-image-frame::after {
  content: "[Изображение скрыто / Image hidden]";
  display: block;
  padding: 24px;
  background: var(--color-muted-bg);
  color: var(--color-text-secondary);
  font-weight: 700;
  border: 2px dashed var(--color-border);
}

/* High Contrast Themes for Visually Impaired */

/* Theme: Black on White (Высокий контраст: черный на белом) */
body.theme-high-contrast {
  --color-bg: #FFFFFF !important;
  --color-surface: #FFFFFF !important;
  --color-text-primary: #000000 !important;
  --color-text-secondary: #000000 !important;
  --color-accent: #000000 !important;
  --color-border: #000000 !important;
  --color-muted-bg: #F0F0F0 !important;
  --color-interactive: #000000 !important;
  background-color: #FFFFFF !important;
  color: #000000 !important;
}
body.theme-high-contrast header,
body.theme-high-contrast footer,
body.theme-high-contrast section,
body.theme-high-contrast .card,
body.theme-high-contrast .callout,
body.theme-high-contrast .conversion-bridge-block,
body.theme-high-contrast .pricing-card,
body.theme-high-contrast .checkout-form-container,
body.theme-high-contrast details,
body.theme-high-contrast .table-wrapper,
body.theme-high-contrast table,
body.theme-high-contrast th,
body.theme-high-contrast td {
  background-color: #FFFFFF !important;
  color: #000000 !important;
  border-color: #000000 !important;
  border-width: 2px !important;
}
body.theme-high-contrast a {
  color: #000000 !important;
  text-decoration: underline !important;
  text-decoration-thickness: 2px !important;
}
body.theme-high-contrast .btn-primary,
body.theme-high-contrast .nav-cta-btn {
  background-color: #000000 !important;
  color: #FFFFFF !important;
  border: 2px solid #000000 !important;
}
body.theme-high-contrast .btn-secondary {
  background-color: #FFFFFF !important;
  color: #000000 !important;
  border: 2px solid #000000 !important;
}

/* Theme: Inverted (Белый текст на черном фоне) */
body.theme-inverted {
  --color-bg: #000000 !important;
  --color-surface: #000000 !important;
  --color-text-primary: #FFFFFF !important;
  --color-text-secondary: #E5E7EB !important;
  --color-accent: #FFFFFF !important;
  --color-border: #FFFFFF !important;
  --color-muted-bg: #1F2937 !important;
  --color-interactive: #FFFFFF !important;
  background-color: #000000 !important;
  color: #FFFFFF !important;
}
body.theme-inverted header,
body.theme-inverted footer,
body.theme-inverted section,
body.theme-inverted .card,
body.theme-inverted .callout,
body.theme-inverted .conversion-bridge-block,
body.theme-inverted .pricing-card,
body.theme-inverted .checkout-form-container,
body.theme-inverted details,
body.theme-inverted .table-wrapper,
body.theme-inverted table,
body.theme-inverted th,
body.theme-inverted td,
body.theme-inverted input,
body.theme-inverted select {
  background-color: #000000 !important;
  color: #FFFFFF !important;
  border-color: #FFFFFF !important;
  border-width: 2px !important;
}
body.theme-inverted a {
  color: #60A5FA !important;
  text-decoration: underline !important;
  text-decoration-thickness: 2px !important;
}
body.theme-inverted .btn-primary,
body.theme-inverted .nav-cta-btn {
  background-color: #FFFFFF !important;
  color: #000000 !important;
  border: 2px solid #FFFFFF !important;
}
body.theme-inverted .btn-secondary {
  background-color: #000000 !important;
  color: #FFFFFF !important;
  border: 2px solid #FFFFFF !important;
}

/* Theme: Yellow on Black (Желтый на черном — классический офтальмологический контраст) */
body.theme-yellow-black {
  --color-bg: #000000 !important;
  --color-surface: #000000 !important;
  --color-text-primary: #FFFF00 !important;
  --color-text-secondary: #FFEA00 !important;
  --color-accent: #FFFF00 !important;
  --color-border: #FFFF00 !important;
  --color-muted-bg: #111111 !important;
  --color-interactive: #FFFF00 !important;
  background-color: #000000 !important;
  color: #FFFF00 !important;
}
body.theme-yellow-black header,
body.theme-yellow-black footer,
body.theme-yellow-black section,
body.theme-yellow-black .card,
body.theme-yellow-black .callout,
body.theme-yellow-black .conversion-bridge-block,
body.theme-yellow-black .pricing-card,
body.theme-yellow-black .checkout-form-container,
body.theme-yellow-black details,
body.theme-yellow-black .table-wrapper,
body.theme-yellow-black table,
body.theme-yellow-black th,
body.theme-yellow-black td,
body.theme-yellow-black input,
body.theme-yellow-black select {
  background-color: #000000 !important;
  color: #FFFF00 !important;
  border-color: #FFFF00 !important;
  border-width: 2px !important;
}
body.theme-yellow-black a {
  color: #FFFF00 !important;
  text-decoration: underline !important;
  text-decoration-thickness: 2px !important;
}
body.theme-yellow-black .btn-primary,
body.theme-yellow-black .nav-cta-btn {
  background-color: #FFFF00 !important;
  color: #000000 !important;
  border: 2px solid #FFFF00 !important;
}
body.theme-yellow-black .btn-secondary {
  background-color: #000000 !important;
  color: #FFFF00 !important;
  border: 2px solid #FFFF00 !important;
}

/* Theme: Blue Soft (Синий на темно-синем / мягкий) */
body.theme-blue-soft {
  --color-bg: #E0F2FE !important;
  --color-surface: #FFFFFF !important;
  --color-text-primary: #0369A1 !important;
  --color-text-secondary: #075985 !important;
  --color-accent: #0284C7 !important;
  --color-border: #7DD3FC !important;
  --color-muted-bg: #BAE6FD !important;
  --color-interactive: #0369A1 !important;
  background-color: #E0F2FE !important;
  color: #0369A1 !important;
}
body.theme-blue-soft header,
body.theme-blue-soft footer,
body.theme-blue-soft .card,
body.theme-blue-soft .callout,
body.theme-blue-soft .conversion-bridge-block,
body.theme-blue-soft .pricing-card,
body.theme-blue-soft .checkout-form-container,
body.theme-blue-soft details,
body.theme-blue-soft table {
  background-color: #FFFFFF !important;
  color: #0369A1 !important;
  border-color: #0284C7 !important;
}
body.theme-blue-soft .btn-primary,
body.theme-blue-soft .nav-cta-btn {
  background-color: #0284C7 !important;
  color: #FFFFFF !important;
}

/* Large and high-contrast form controls */
body.font-size-large .form-control,
body.font-size-xlarge .form-control {
  min-height: 54px;
  font-size: 1.3rem;
  border-width: 2px;
}


/* ==========================================================================
   8. CERTIFICATIONS & TRUST BADGES SECTION (Секция сертификатов)
   ========================================================================== */
.certifications-section {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.certifications-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto var(--space-xl) auto;
}

.certifications-header h2 {
  border-bottom: none;
  margin-bottom: var(--space-xs);
}

.certifications-header p {
  color: var(--color-text-secondary);
  margin: 0 auto;
}

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 1040px;
  margin: 0 auto;
}

.cert-card {
  background-color: #FFFFFF;
  border: 1px solid #E0E0E0;
  border-radius: 8px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.cert-card:hover {
  transform: translateY(-2px);
  border-color: #B0B0B0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.cert-icon {
  width: 90px;
  height: 90px;
  margin-bottom: 20px;
  color: #4A453E;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cert-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.cert-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
  font-family: var(--font-sans);
}

.cert-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  max-width: 440px;
}

/* Accessibility themes integration for Certifications */
body.theme-high-contrast .cert-card {
  background-color: #FFFFFF !important;
  border: 2px solid #000000 !important;
}
body.theme-high-contrast .cert-icon {
  color: #000000 !important;
}

body.theme-inverted .cert-card {
  background-color: #000000 !important;
  border: 2px solid #FFFFFF !important;
}
body.theme-inverted .cert-icon {
  color: #FFFFFF !important;
}

body.theme-yellow-black .cert-card {
  background-color: #000000 !important;
  border: 2px solid #FFFF00 !important;
}
body.theme-yellow-black .cert-icon {
  color: #FFFF00 !important;
}

body.theme-blue-soft .cert-card {
  background-color: #FFFFFF !important;
  border: 1px solid #7DD3FC !important;
}
body.theme-blue-soft .cert-icon {
  color: #0284C7 !important;
}

@media (max-width: 768px) {
  .certifications-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .cert-card {
    padding: 24px 20px;
  }
}


/* Form status messages & anti-spam honeypot */
.form-feedback-message {
  padding: 14px 18px;
  border-radius: 4px;
  margin-bottom: 20px;
  font-size: 0.95rem;
  font-weight: 600;
  display: none;
}

.form-feedback-message.error {
  display: block;
  background-color: #FEF2F2;
  color: #991B1B;
  border: 1px solid #FCA5A5;
}

.form-feedback-message.success {
  display: block;
  background-color: #F0FDF4;
  color: #166534;
  border: 1px solid #86EFAC;
}

.sr-only-hp {
  position: absolute !important;
  left: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

button:disabled,
.btn-primary:disabled {
  opacity: 0.65;
  cursor: not-allowed !important;
  transform: none !important;
}