/* TNT Pro Series - SEO Subpages V3 Shopify Design System */
/* Brand: Dark Charcoal #1f1f21, Vibrant Yellow #f6e948, White text, industrial aesthetic */

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Brand Colors — V3 Shopify */
  --color-bg: #1f1f21;
  --color-yellow: #f6e948;
  --color-yellow-hover: #f8ee6d;
  --color-yellow-dark: #d4ca30;
  --color-white: #ffffff;
  --color-surface-1: #2a2a2d;
  --color-surface-2: #333336;
  --color-surface-3: #3c3c40;

  /* Semantic */
  --bg-primary: var(--color-bg);
  --bg-surface: var(--color-surface-1);
  --bg-surface-2: var(--color-surface-2);
  --bg-surface-3: var(--color-surface-3);
  --text-primary: var(--color-white);
  --text-secondary: #c5c5c5;
  --text-muted: #8a8a8e;
  --accent: var(--color-yellow);
  --accent-hover: var(--color-yellow-hover);
  --accent-dark: var(--color-yellow-dark);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-strong: rgba(255, 255, 255, 0.15);

  /* Typography Scale (clamp-based fluid) */
  --text-xs: clamp(0.6875rem, 0.65rem + 0.1vw, 0.75rem);
  --text-sm: clamp(0.8125rem, 0.78rem + 0.15vw, 0.875rem);
  --text-base: clamp(0.9375rem, 0.9rem + 0.2vw, 1rem);
  --text-lg: clamp(1.0625rem, 1rem + 0.3vw, 1.125rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.75rem + 2vw, 3rem);

  /* Spacing (4px grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Radius — Sharp Industrial */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 4px;
  --radius-xl: 4px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.6);
  --shadow-yellow: 0 2px 8px rgba(246, 233, 72, 0.3);

  /* Layout */
  --content-max: 720px;
  --page-max: 1200px;
  --sidebar-width: 240px;

  /* Easing */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: 'Figtree', system-ui, -apple-system, sans-serif;
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color 180ms var(--ease-out); }
a:hover { color: var(--accent-hover); }

/* ===== SKIP NAV ===== */
.skip-nav {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--accent);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: var(--text-sm);
  z-index: 100;
}
.skip-nav:focus {
  top: var(--space-4);
}

/* ===== STICKY HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--border-color);
  transition: box-shadow 300ms var(--ease-out);
}
.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.header-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-primary);
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.header-logo:hover { color: var(--text-primary); }
.header-logo svg {
  flex-shrink: 0;
}
.header-logo span {
  white-space: nowrap;
}
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--accent);
  color: var(--color-bg);
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all 180ms var(--ease-out);
  box-shadow: var(--shadow-yellow);
}
.header-cta:hover {
  background: var(--accent-hover);
  color: var(--color-bg);
  transform: translateY(-1px);
  filter: brightness(1.1);
}

/* ===== BREADCRUMBS ===== */
.breadcrumbs {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--text-muted);
}
.breadcrumbs li::after {
  content: '›';
  margin-left: var(--space-1);
  color: var(--text-muted);
}
.breadcrumbs li:last-child::after { display: none; }
.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs a:hover { color: var(--accent); }

/* ===== PAGE LAYOUT ===== */
.page-layout {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 1024px) {
  .page-layout {
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-10);
  }
}

/* ===== TABLE OF CONTENTS (Sidebar) ===== */
.toc {
  display: none;
}
@media (min-width: 1024px) {
  .toc {
    display: block;
    position: sticky;
    top: 80px;
    align-self: start;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    padding-right: var(--space-4);
  }
}
.toc-title {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}
.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.toc-list a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all 180ms var(--ease-out);
  line-height: 1.4;
}
.toc-list a:hover,
.toc-list a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(246, 233, 72, 0.05);
}

/* Mobile TOC */
.toc-mobile {
  display: block;
  margin-bottom: var(--space-6);
}
@media (min-width: 1024px) {
  .toc-mobile { display: none; }
}
.toc-mobile-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Figtree', sans-serif;
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}
.toc-mobile-toggle .chevron {
  transition: transform 200ms var(--ease-out);
  font-size: var(--text-xs);
}
.toc-mobile-toggle.open .chevron {
  transform: rotate(180deg);
}
.toc-mobile-list {
  display: none;
  list-style: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  padding: var(--space-2) 0;
}
.toc-mobile-list.open { display: block; }
.toc-mobile-list a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.toc-mobile-list a:hover { color: var(--accent); }

/* ===== ARTICLE CONTENT ===== */
.article-content {
  max-width: var(--content-max);
  padding-bottom: var(--space-20);
}

/* Article Header */
.article-header {
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--border-color);
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: 'Figtree', sans-serif;
  font-weight: 600;
}
.article-meta .divider {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-muted);
}
.article-category {
  color: var(--accent);
  font-weight: 700;
}
.article-title {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
}
.article-subtitle {
  font-family: 'Figtree', sans-serif;
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 60ch;
  font-weight: 500;
}

/* Section Headings */
.article-content h2 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin-top: var(--space-12);
  margin-bottom: var(--space-5);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-color);
  text-transform: uppercase;
}
.article-content h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}
.article-content h3 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
}

/* Paragraphs & Lists */
.article-content p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 500;
}
.article-content ul,
.article-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-5);
  color: var(--text-secondary);
}
.article-content li {
  margin-bottom: var(--space-2);
  line-height: 1.6;
}
.article-content li::marker {
  color: var(--accent);
}
.article-content strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* ===== KEY TAKEAWAY BOX ===== */
.key-takeaway {
  background: rgba(246, 233, 72, 0.08);
  border: 1px solid rgba(246, 233, 72, 0.2);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
}
.key-takeaway-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}
.key-takeaway p {
  color: var(--text-primary) !important;
  font-size: var(--text-base);
  line-height: 1.6;
  margin-bottom: 0 !important;
}

/* ===== COMPARISON TABLE ===== */
.table-wrapper {
  overflow-x: auto;
  margin: var(--space-6) 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.comparison-table caption {
  padding: var(--space-4);
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: var(--text-base);
  text-align: left;
  background: var(--bg-surface-2);
  border-bottom: 1px solid var(--border-color);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.comparison-table th {
  background: var(--bg-surface);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-family: 'Oswald', sans-serif;
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}
.comparison-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  vertical-align: top;
}
.comparison-table tr:last-child td {
  border-bottom: none;
}
.comparison-table tr:hover td {
  background: rgba(246, 233, 72, 0.03);
}
.comparison-table .highlight {
  color: var(--accent);
  font-weight: 600;
}
.comparison-table .product-name {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== CTA SECTION ===== */
.cta-section {
  position: relative;
  background: linear-gradient(135deg, var(--bg-surface-2), var(--bg-surface));
  border: 1px solid var(--border-color-strong);
  border-radius: var(--radius-md);
  padding: var(--space-8) var(--space-6);
  margin: var(--space-8) 0;
  text-align: center;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 120px;
  height: 120px;
  background: repeating-linear-gradient(
    -45deg,
    var(--accent),
    var(--accent) 3px,
    transparent 3px,
    transparent 12px
  );
  opacity: 0.12;
  pointer-events: none;
}
.cta-section::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: -20px;
  width: 80px;
  height: 80px;
  background: repeating-linear-gradient(
    -45deg,
    var(--accent),
    var(--accent) 2px,
    transparent 2px,
    transparent 10px
  );
  opacity: 0.08;
  pointer-events: none;
}
.cta-section h3 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  position: relative;
  z-index: 1;
}
.cta-section p {
  color: var(--text-secondary);
  margin-bottom: var(--space-5);
  max-width: 50ch;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
}
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--accent);
  color: var(--color-bg);
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all 180ms var(--ease-out);
  box-shadow: var(--shadow-yellow);
  position: relative;
  z-index: 1;
}
.cta-button:hover {
  background: var(--accent-hover);
  color: var(--color-bg);
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 4px 16px rgba(246, 233, 72, 0.4);
}
.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  position: relative;
  z-index: 1;
}
.cta-button-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: transparent;
  color: var(--accent);
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-6);
  border: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: all 180ms var(--ease-out);
  position: relative;
  z-index: 1;
}
.cta-button-secondary:hover {
  background: rgba(246, 233, 72, 0.1);
  color: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-1px);
}

/* ===== FAQ SECTION ===== */
.faq-section {
  margin: var(--space-10) 0;
}
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-surface);
  border: none;
  color: var(--text-primary);
  font-family: 'Figtree', sans-serif;
  font-size: var(--text-base);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background 180ms var(--ease-out);
}
.faq-question:hover {
  background: var(--bg-surface-2);
}
.faq-question .icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: transform 200ms var(--ease-out);
  font-size: var(--text-lg);
  font-weight: 300;
}
.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
}
.faq-answer {
  display: none;
  padding: 0 var(--space-5) var(--space-5);
  background: var(--bg-surface);
}
.faq-item.open .faq-answer {
  display: block;
}
.faq-answer p {
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== EDITORIAL REVIEW & SOURCES ===== */
.editorial-review {
  margin: var(--space-8) 0 var(--space-10);
  padding: var(--space-6);
  border: 1px solid rgba(246, 233, 72, 0.28);
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(246, 233, 72, 0.08), rgba(246, 233, 72, 0.02)),
    var(--bg-surface);
}
.editorial-review h2,
.sources-section h2 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-lg);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
}
.editorial-review > p,
.sources-section > p {
  color: var(--text-secondary);
  line-height: 1.65;
}
.editorial-review-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-5);
}
@media (min-width: 640px) {
  .editorial-review-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.editorial-review-card {
  background: rgba(13, 22, 28, 0.72);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.editorial-review-label {
  display: block;
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}
.editorial-review-value {
  color: var(--text-primary);
  line-height: 1.6;
}
.editorial-review-note {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.sources-section {
  margin: var(--space-10) 0;
  padding: var(--space-6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
}
.sources-list {
  margin: var(--space-4) 0 0;
  padding-left: 1.2rem;
  color: var(--text-secondary);
}
.sources-list li + li {
  margin-top: var(--space-3);
}
.sources-list a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: rgba(246, 233, 72, 0.45);
  text-underline-offset: 0.18em;
}
.sources-list a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}
.source-disclaimer {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ===== AUTHOR BIO ===== */
.author-bio {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  margin: var(--space-10) 0;
}
.author-avatar {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Oswald', sans-serif;
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--color-bg);
}
.author-info h4 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-base);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}
.author-info .author-title {
  font-size: var(--text-sm);
  color: var(--accent);
  margin-bottom: var(--space-3);
  font-weight: 600;
}
.author-info p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== RELATED ARTICLES ===== */
.related-articles {
  margin: var(--space-10) 0;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-color);
}
.related-articles h3 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-lg);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-5);
}
.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 640px) {
  .related-grid { grid-template-columns: 1fr 1fr; }
}
.related-card {
  display: block;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: all 180ms var(--ease-out);
}
.related-card:hover {
  border-color: var(--accent);
  background: var(--bg-surface-2);
  transform: translateY(-2px);
}
.related-card .card-category {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}
.related-card .card-title {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.3;
  text-transform: uppercase;
}
.related-card .card-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: var(--space-10) var(--space-5);
  margin-top: var(--space-16);
}
.footer-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 768px) {
  .footer-inner { grid-template-columns: 2fr 1fr 1fr; }
}
.footer-brand h4 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-lg);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
}
.footer-brand p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 36ch;
}
.footer-links h5 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}
.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  max-width: var(--page-max);
  margin: var(--space-8) auto 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-muted);
}
.footer-bottom a {
  color: var(--text-muted);
}
.footer-bottom a:hover { color: var(--accent); }

/* ===== PRODUCT CARDS (inline) ===== */
.product-mention {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--bg-surface-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}
.product-mention .price {
  color: var(--accent);
  font-weight: 700;
}

/* ===== INDEX PAGE ===== */
.index-hero {
  position: relative;
  padding: var(--space-20) var(--space-5);
  text-align: center;
  overflow: hidden;
}
/* Diagonal stripe — top right */
.index-hero::before {
  content: '';
  position: absolute;
  top: -30px;
  right: -30px;
  width: 160px;
  height: 160px;
  background: repeating-linear-gradient(
    -45deg,
    var(--accent),
    var(--accent) 3px,
    transparent 3px,
    transparent 12px
  );
  opacity: 0.15;
  pointer-events: none;
}
/* Diagonal stripe — bottom left */
.index-hero::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: -20px;
  width: 100px;
  height: 100px;
  background: repeating-linear-gradient(
    -45deg,
    var(--accent),
    var(--accent) 2px,
    transparent 2px,
    transparent 10px
  );
  opacity: 0.1;
  pointer-events: none;
}
.index-hero h1 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-4xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.05;
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 1;
}
.index-hero .accent { color: var(--accent); }
.index-hero p {
  font-family: 'Figtree', sans-serif;
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 55ch;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
  position: relative;
  z-index: 1;
  font-weight: 500;
}
.index-cards {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  padding: 0 var(--space-5) var(--space-20);
}
@media (min-width: 640px) {
  .index-cards { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .index-cards { grid-template-columns: 1fr 1fr 1fr; }
}
.index-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition: all 200ms var(--ease-out);
}
.index-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(246, 233, 72, 0.15);
}
.index-card .card-num {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--accent);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-4);
}
.index-card h2 {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}
.index-card p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-5);
  flex: 1;
}
.index-card .read-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.index-card .read-link:hover { color: var(--accent-hover); }

/* ===== UTILITY CLASSES ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transition: opacity 500ms var(--ease-out);
}
.fade-in.visible { opacity: 1; }

/* ===== DIAGONAL STRIPE UTILITY ===== */
.diagonal-stripe {
  position: relative;
  overflow: hidden;
}
.diagonal-stripe::before {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 120px;
  height: 120px;
  background: repeating-linear-gradient(
    -45deg,
    var(--accent),
    var(--accent) 3px,
    transparent 3px,
    transparent 12px
  );
  opacity: 0.15;
  pointer-events: none;
}

/* ===== YELLOW ACCENT BAR (section divider) ===== */
.yellow-bar {
  width: 60px;
  height: 4px;
  background: var(--accent);
  margin-bottom: var(--space-4);
}

/* ===== RESPONSIVE FIXES ===== */
@media (max-width: 639px) {
  .article-title { font-size: var(--text-2xl); }
  .article-header { margin-bottom: var(--space-6); padding-bottom: var(--space-5); }
  .article-content h2 { font-size: var(--text-xl); margin-top: var(--space-8); }
  .cta-section { padding: var(--space-6) var(--space-4); }
  .author-bio { flex-direction: column; align-items: center; text-align: center; }
  .comparison-table { font-size: var(--text-xs); }
  .comparison-table th, .comparison-table td { padding: var(--space-2) var(--space-3); }
}

/* ===== PRINT ===== */
@media print {
  .site-header, .toc, .toc-mobile, .cta-section, .site-footer { display: none; }
  body { background: white; color: black; }
  .article-content p, .article-content li { color: #333; }
}

/* ===== V3 NAVIGATION (matching main site) ===== */
.site-header .header-inner {
  padding: var(--space-3) var(--space-5);
}
.header-logo img {
  height: 36px;
  width: auto;
  display: block;
}
.header-nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
}
@media (min-width: 1024px) {
  .header-nav { display: flex; }
}
.header-nav a {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color 180ms var(--ease-out);
  white-space: nowrap;
}
.header-nav a:hover,
.header-nav a.nav-active {
  color: var(--accent);
}
.header-nav .nav-cart {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: var(--space-2);
  color: var(--text-secondary);
}
.header-nav .nav-cart:hover {
  color: var(--accent);
}

/* Hamburger (mobile) */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
@media (min-width: 1024px) {
  .hamburger { display: none; }
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 250ms var(--ease-out);
}
.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu Overlay */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 49;
  background: rgba(31, 31, 33, 0.97);
  backdrop-filter: blur(8px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}
.mobile-menu.open {
  display: flex;
}
.mobile-menu a {
  font-family: 'Oswald', sans-serif;
  font-size: var(--text-xl);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-6);
  transition: color 180ms var(--ease-out);
}
.mobile-menu a:hover,
.mobile-menu a.nav-active {
  color: var(--accent);
}

/* Footer logo */
.footer-logo-img {
  height: 28px;
  width: auto;
  margin-bottom: var(--space-3);
  opacity: 0.85;
}