/* ==========================================================================
   English8 — CSS Design System & Styles
   Light theme with moderate vibrant educational accents
   Compliant with SEO and Accessibility standards
   ========================================================================== */

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  --color-surface-alt: #f8fafc;
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;
  --color-border-light: #edf2f7;
  --color-border-hover: #cbd5e1;

  /* Brand & Accents */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-primary-dark: #1e40af;
  
  --color-accent-emerald: #059669;
  --color-accent-emerald-light: #ecfdf5;
  --color-accent-emerald-border: #a7f3d0;
  
  --color-accent-amber: #d97706;
  --color-accent-amber-light: #fffbeb;
  --color-accent-amber-border: #fde68a;
  
  --color-accent-purple: #7c3aed;
  --color-accent-purple-light: #f5f3ff;
  --color-accent-purple-border: #ddd6fe;

  --color-accent-coral: #dc2626;
  --color-accent-coral-light: #fef2f2;
  --color-accent-coral-border: #fecaca;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.09), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --header-h: 72px;
  --max-w: 1200px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility: Skip to Content */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--color-primary);
  color: #ffffff;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 1000;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid #000;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-main);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  margin-top: 2rem;
  margin-bottom: 1rem;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

h3 {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

p {
  margin-bottom: 1.15rem;
  color: var(--color-text-main);
}

p.lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

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

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

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

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.site-main {
  flex: 1;
  padding-bottom: 4rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-h);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text-main);
}
.brand-logo:hover {
  text-decoration: none;
}
.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}
.brand-text-sub {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-light);
  line-height: 1;
  margin-top: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.25rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  font-weight: 600;
  font-size: 0.925rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.3;
}
.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

.btn-accent {
  background-color: var(--color-accent-emerald);
  color: #ffffff;
}
.btn-accent:hover {
  background-color: #047857;
  color: #ffffff;
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-text-main);
}

/* Breadcrumbs */
.breadcrumbs-nav {
  padding: 1rem 0 0.5rem;
}
.breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-light);
}
.breadcrumbs-item + .breadcrumbs-item::before {
  content: "›";
  margin: 0 0.5rem;
  color: var(--color-text-light);
}
.breadcrumbs-link {
  color: var(--color-text-muted);
}
.breadcrumbs-link:hover {
  color: var(--color-primary);
}
.breadcrumbs-current {
  color: var(--color-text-main);
  font-weight: 500;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 2.5rem 0 3rem;
  margin-bottom: 2.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.25fr 0.75fr;
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.825rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}
.badge-blue {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 1px solid #bfdbfe;
}
.badge-green {
  background-color: var(--color-accent-emerald-light);
  color: #065f46;
  border: 1px solid var(--color-accent-emerald-border);
}
.badge-amber {
  background-color: var(--color-accent-amber-light);
  color: #92400e;
  border: 1px solid var(--color-accent-amber-border);
}
.badge-purple {
  background-color: var(--color-accent-purple-light);
  color: #5b21b6;
  border: 1px solid var(--color-accent-purple-border);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}
.stat-item {
  text-align: left;
}
.stat-num {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
}
.stat-label {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.hero-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
}

/* Cards & Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0 2.5rem;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.card-title {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}
.card-body {
  flex: 1;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}
.card-footer {
  margin-top: auto;
}

/* Info Boxes / Callouts */
.callout {
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
}
.callout-title {
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.callout-amber {
  border-left-color: var(--color-accent-amber);
  background-color: var(--color-accent-amber-light);
}
.callout-green {
  border-left-color: var(--color-accent-emerald);
  background-color: var(--color-accent-emerald-light);
}
.callout-purple {
  border-left-color: var(--color-accent-purple);
  background-color: var(--color-accent-purple-light);
}
.callout-coral {
  border-left-color: var(--color-accent-coral);
  background-color: var(--color-accent-coral-light);
}

/* Educational Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0 2rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
table.edu-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}
table.edu-table caption {
  padding: 1rem 1.25rem;
  font-weight: 700;
  text-align: left;
  color: var(--color-text-main);
  background-color: #f8fafc;
  border-bottom: 1px solid var(--color-border);
}
table.edu-table th {
  background-color: #f1f5f9;
  color: var(--color-text-main);
  font-weight: 700;
  padding: 0.85rem 1.25rem;
  border-bottom: 2px solid var(--color-border);
}
table.edu-table td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
table.edu-table tr:last-child td {
  border-bottom: none;
}
table.edu-table tr:nth-child(even) td {
  background-color: #fafbfc;
}
.rule-formula {
  font-family: var(--font-mono);
  background-color: #f1f5f9;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--color-primary-dark);
  font-weight: 600;
}

/* Formula Highlight Box */
.formula-box {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  color: #f8fafc;
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
}
.formula-box h3 {
  color: #60a5fa;
  margin-top: 0;
  margin-bottom: 0.5rem;
}
.formula-syntax {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  background-color: rgba(255, 255, 255, 0.1);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  margin: 0.75rem 0;
  display: block;
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* Interactive Trainer / Quiz Component */
.trainer-container {
  background-color: var(--color-surface);
  border: 2px solid #3b82f6;
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-lg);
}
.trainer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}
.trainer-step {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.trainer-progress-bar {
  width: 100%;
  height: 8px;
  background-color: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 0.5rem;
}
.trainer-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #2563eb, #10b981);
  width: 0%;
  transition: width 0.3s ease;
}

.quiz-question {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--color-text-main);
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.quiz-opt-btn {
  text-align: left;
  background-color: #f8fafc;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.quiz-opt-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}
.quiz-opt-btn.correct {
  border-color: var(--color-accent-emerald);
  background-color: var(--color-accent-emerald-light);
  color: #065f46;
  font-weight: 700;
}
.quiz-opt-btn.incorrect {
  border-color: var(--color-accent-coral);
  background-color: var(--color-accent-coral-light);
  color: #991b1b;
}

.quiz-feedback {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  display: none;
}
.quiz-feedback.show {
  display: block;
}
.quiz-feedback.correct-feedback {
  background-color: var(--color-accent-emerald-light);
  border: 1px solid var(--color-accent-emerald-border);
  color: #065f46;
}
.quiz-feedback.incorrect-feedback {
  background-color: var(--color-accent-coral-light);
  border: 1px solid var(--color-accent-coral-border);
  color: #991b1b;
}

/* Results Card in Quiz */
.results-card {
  text-align: center;
  padding: 2rem 1rem;
}
.results-score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #10b981);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
}
.score-big {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1;
}
.score-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}
.results-cta {
  background-color: #f8fafc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.5rem;
  text-align: left;
}

/* Diagnostic Test Full Interface */
.diag-timer {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: #f1f5f9;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-primary-dark);
}

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}
.pricing-card {
  background-color: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}
.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-xl);
}
.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #2563eb, #7c3aed);
  color: #fff;
  padding: 0.3rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.price-value {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--color-text-main);
  margin: 1rem 0 0.5rem;
}
.price-period {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}
details.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: var(--transition);
}
details.faq-item[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
summary.faq-question {
  font-weight: 700;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-main);
}
summary.faq-question::-webkit-details-marker {
  display: none;
}
summary.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}
details.faq-item[open] summary.faq-question::after {
  content: "−";
}
.faq-answer {
  margin-top: 1rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  border-top: 1px solid var(--color-border-light);
  padding-top: 0.75rem;
}

/* Form Styles */
.lead-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: left;
}
.form-label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-main);
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.95rem;
  background-color: #ffffff;
  color: var(--color-text-main);
  transition: var(--transition);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}
.modal-overlay.active {
  display: flex;
}
.modal-dialog {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  max-width: 520px;
  width: 100%;
  padding: 2rem;
  position: relative;
  box-shadow: var(--shadow-xl);
  max-height: 90vh;
  overflow-y: auto;
}
.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}

/* Footer */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 3.5rem 0 2rem;
  margin-top: auto;
  border-top: 1px solid #1e293b;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-title {
  color: #f8fafc;
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-links li {
  margin-bottom: 0.65rem;
}
.footer-links a {
  color: #94a3b8;
  font-size: 0.925rem;
}
.footer-links a:hover {
  color: #60a5fa;
  text-decoration: none;
}
.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
}

/* Responsive adjustments */
@media (max-width: 860px) {
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid var(--color-border);
    padding: 1.25rem;
    box-shadow: var(--shadow-lg);
  }
  .main-nav.open {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    gap: 0.5rem;
  }
  .mobile-toggle {
    display: flex;
  }
}