/* =============================================
   BRANISLAV.WEBSITE — Windows 11 & AI Blog
   Design: Tech-forward, dark/light, modern
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root,
[data-theme='light'] {
  --color-bg: #f0f2f5;
  --color-surface: #ffffff;
  --color-surface-2: #f8f9fa;
  --color-surface-offset: #e8eaed;
  --color-border: #d0d3d8;
  --color-divider: #e2e5ea;
  --color-text: #1a1c20;
  --color-text-muted: #5a6070;
  --color-text-faint: #9aa0ad;
  --color-text-inverse: #ffffff;
  --color-primary: #0078d4;
  --color-primary-hover: #005fa3;
  --color-primary-active: #004880;
  --color-primary-highlight: #cce4f7;
  --color-accent: #00b294;
  --color-accent-hover: #00896f;
  --color-win11: #0078d4;
  --color-ai: #7c3aed;
  --color-ai-hover: #6d28d9;
  --color-success: #107c10;
  --color-warning: #d83b01;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.13);
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --font-body: 'Inter', system-ui, sans-serif;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-hero: clamp(2.5rem, 1rem + 4vw, 4.5rem);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

[data-theme='dark'] {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #1c2128;
  --color-surface-offset: #1a2030;
  --color-border: #30363d;
  --color-divider: #21262d;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-text-faint: #484f58;
  --color-text-inverse: #0d1117;
  --color-primary: #58a6ff;
  --color-primary-hover: #79b8ff;
  --color-primary-active: #9ecbff;
  --color-primary-highlight: #1f3a5c;
  --color-accent: #3fb950;
  --color-accent-hover: #2ea043;
  --color-win11: #58a6ff;
  --color-ai: #a78bfa;
  --color-ai-hover: #c4b5fd;
  --color-success: #3fb950;
  --color-warning: #f78166;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0d1117;
    --color-surface: #161b22;
    --color-surface-2: #1c2128;
    --color-surface-offset: #1a2030;
    --color-border: #30363d;
    --color-divider: #21262d;
    --color-text: #e6edf3;
    --color-text-muted: #8b949e;
    --color-text-faint: #484f58;
    --color-text-inverse: #0d1117;
    --color-primary: #58a6ff;
    --color-primary-hover: #79b8ff;
    --color-primary-active: #9ecbff;
    --color-primary-highlight: #1f3a5c;
    --color-accent: #3fb950;
    --color-accent-hover: #2ea043;
    --color-win11: #58a6ff;
    --color-ai: #a78bfa;
    --color-ai-hover: #c4b5fd;
    --color-success: #3fb950;
    --color-warning: #f78166;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  }
}

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

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

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
  transition: background-color 0.3s ease, color 0.3s ease;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1,h2,h3,h4,h5,h6 { text-wrap: balance; line-height: 1.2; font-family: var(--font-display); }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
button { cursor: pointer; background: none; border: none; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-interactive); }
a:hover { color: var(--color-primary-hover); }

::selection { background: color-mix(in oklab, var(--color-primary) 25%, transparent); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

/* ======= HEADER / NAV ======= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}
.site-header--scrolled { box-shadow: var(--shadow-md); }

.nav-container {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 64px;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo svg { width: 36px; height: 36px; }
.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.2;
}
.nav-logo-text span { display: block; font-size: var(--text-xs); font-weight: 400; color: var(--color-text-muted); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  flex: 1;
}
.nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--transition-interactive);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav-links a.active { color: var(--color-primary); background: var(--color-primary-highlight); }
.nav-links a.active-ai { color: var(--color-ai); background: color-mix(in oklab, var(--color-ai) 12%, transparent); }

.nav-actions { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; }

.theme-toggle {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  transition: all var(--transition-interactive);
  cursor: pointer;
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px; height: 36px;
  align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
}
.hamburger span { width: 18px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all 0.3s; }

/* ======= HERO ======= */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(var(--space-16), 10vw, var(--space-24)) var(--space-6);
  background: var(--color-bg);
}
.hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--color-primary) 8%, var(--color-bg)) 0%,
    var(--color-bg) 50%,
    color-mix(in oklab, var(--color-ai) 6%, var(--color-bg)) 100%);
  z-index: 0;
}
.hero-grid-pattern {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
  z-index: 0;
}
.hero-content {
  position: relative; z-index: 1;
  max-width: var(--content-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: color-mix(in oklab, var(--color-warning) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--color-warning) 30%, transparent);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-warning);
  margin-bottom: var(--space-5);
  width: fit-content;
}
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-warning); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero-title {
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1.08;
  margin-bottom: var(--space-5);
  color: var(--color-text);
}
.hero-title .highlight-win { color: var(--color-win11); }
.hero-title .highlight-ai { color: var(--color-ai); }

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 52ch;
  line-height: 1.6;
}
.hero-ctas { display: flex; gap: var(--space-4); flex-wrap: wrap; }

.hero-visual {
  position: relative;
  display: flex; flex-direction: column; gap: var(--space-4);
}
.hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-6);
  display: flex; align-items: center; gap: var(--space-4);
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.hero-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.hero-card-icon {
  width: 44px; height: 44px; border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 1.4rem;
}
.hero-card-icon.win { background: color-mix(in oklab, var(--color-win11) 12%, transparent); }
.hero-card-icon.ai { background: color-mix(in oklab, var(--color-ai) 12%, transparent); }
.hero-card-icon.it { background: color-mix(in oklab, var(--color-accent) 12%, transparent); }
.hero-card-text strong { font-size: var(--text-sm); font-weight: 600; color: var(--color-text); display: block; }
.hero-card-text span { font-size: var(--text-xs); color: var(--color-text-muted); }

/* ======= BUTTONS ======= */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 600;
  text-decoration: none; cursor: pointer; border: none;
  transition: all var(--transition-interactive);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 16px color-mix(in oklab, var(--color-primary) 40%, transparent); }
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-surface-offset); color: var(--color-text); }
.btn-ai {
  background: var(--color-ai);
  color: #fff;
}
.btn-ai:hover { background: var(--color-ai-hover); color: #fff; transform: translateY(-1px); }

/* ======= CONTAINER ======= */
.container { max-width: var(--content-wide); margin: 0 auto; padding: 0 var(--space-6); }
.container-narrow { max-width: var(--content-default); margin: 0 auto; padding: 0 var(--space-6); }

/* ======= SECTIONS ======= */
.section { padding: clamp(var(--space-12), 7vw, var(--space-20)) 0; }
.section-header { text-align: center; margin-bottom: var(--space-12); }
.section-eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.section-eyebrow.ai-color { color: var(--color-ai); }
.section-title { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
.section-subtitle { font-size: var(--text-base); color: var(--color-text-muted); max-width: 60ch; margin: 0 auto; }

/* ======= ARTICLE GRID ======= */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}
.articles-grid.featured { grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; }
.articles-grid.featured .card-featured { grid-row: span 2; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.card:hover.ai-card { border-color: var(--color-ai); }

.card-img {
  width: 100%; aspect-ratio: 16/9; object-fit: cover;
  background: linear-gradient(135deg, var(--color-surface-offset), var(--color-surface-2));
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  color: var(--color-text-faint);
}
.card-featured .card-img { aspect-ratio: 16/10; font-size: 5rem; }

.card-body { padding: var(--space-5) var(--space-6); flex: 1; display: flex; flex-direction: column; gap: var(--space-3); }
.card-meta { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.card-tag {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 600;
}
.tag-win11 { background: color-mix(in oklab, var(--color-win11) 12%, transparent); color: var(--color-win11); }
.tag-ai { background: color-mix(in oklab, var(--color-ai) 12%, transparent); color: var(--color-ai); }
.tag-it { background: color-mix(in oklab, var(--color-accent) 12%, transparent); color: var(--color-accent); }
.tag-tip { background: color-mix(in oklab, var(--color-warning) 12%, transparent); color: var(--color-warning); }
.card-date { font-size: var(--text-xs); color: var(--color-text-faint); }

.card-title { font-size: var(--text-lg); font-weight: 700; color: var(--color-text); line-height: 1.3; }
.card-featured .card-title { font-size: clamp(1.25rem, 1rem + 1.5vw, 2rem); }
.card-excerpt { font-size: var(--text-sm); color: var(--color-text-muted); flex: 1; }
.card-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--color-divider); display: flex; align-items: center; justify-content: space-between; }
.card-read-more { font-size: var(--text-xs); font-weight: 600; color: var(--color-primary); display: flex; align-items: center; gap: var(--space-1); }
.card-read-more.ai { color: var(--color-ai); }

/* ======= AFFILIATE BANNER ======= */
.affiliate-banner {
  background: linear-gradient(135deg, var(--color-surface), var(--color-surface-2));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8) var(--space-10);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-8);
  position: relative; overflow: hidden;
}
.affiliate-banner::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, color-mix(in oklab, var(--color-primary) 5%, transparent), transparent);
  pointer-events: none;
}
.affiliate-banner-content { flex: 1; }
.affiliate-banner-label { font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-primary); margin-bottom: var(--space-2); }
.affiliate-banner-title { font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--space-3); }
.affiliate-banner-text { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 55ch; }
.affiliate-banner-cta { flex-shrink: 0; }

.affiliate-banner.ai-banner::before { background: linear-gradient(90deg, color-mix(in oklab, var(--color-ai) 8%, transparent), transparent); }
.affiliate-banner.ai-banner .affiliate-banner-label { color: var(--color-ai); }

/* ======= TIPS SECTION ======= */
.tips-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-5); }
.tip-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-3);
  transition: all var(--transition-interactive);
}
.tip-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.tip-card.ai:hover { border-color: var(--color-ai); }
.tip-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--color-primary) 10%, transparent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
}
.tip-icon.ai { background: color-mix(in oklab, var(--color-ai) 10%, transparent); }
.tip-title { font-size: var(--text-base); font-weight: 700; }
.tip-text { font-size: var(--text-sm); color: var(--color-text-muted); flex: 1; }

/* ======= PAGE ARTICLE ======= */
.article-page { max-width: var(--content-narrow); margin: 0 auto; padding: var(--space-12) var(--space-6); }
.article-header { margin-bottom: var(--space-10); }
.article-title { font-size: var(--text-2xl); margin-bottom: var(--space-5); }
.article-meta { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-6); }
.article-hero-img {
  width: 100%; aspect-ratio: 16/9;
  border-radius: var(--radius-xl);
  object-fit: cover;
  margin-bottom: var(--space-10);
  background: linear-gradient(135deg, var(--color-surface-offset), var(--color-surface-2));
  display: flex; align-items: center; justify-content: center;
  font-size: 6rem;
}
.article-body { font-size: var(--text-base); line-height: 1.75; color: var(--color-text); }
.article-body h2 { font-size: var(--text-xl); margin: var(--space-10) 0 var(--space-4); padding-top: var(--space-4); border-top: 1px solid var(--color-divider); }
.article-body h3 { font-size: var(--text-lg); margin: var(--space-8) 0 var(--space-3); }
.article-body p { margin-bottom: var(--space-5); }
.article-body ul, .article-body ol { margin: var(--space-4) 0 var(--space-6) var(--space-6); }
.article-body li { margin-bottom: var(--space-2); }
.article-body .callout {
  background: var(--color-primary-highlight);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-4) var(--space-5);
  margin: var(--space-6) 0;
  font-size: var(--text-sm);
}
.article-body .callout.ai-callout {
  background: color-mix(in oklab, var(--color-ai) 10%, transparent);
  border-left-color: var(--color-ai);
}
.article-affiliate {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin: var(--space-8) 0;
  display: flex; align-items: center; gap: var(--space-5);
}
.article-affiliate-icon { font-size: 2.5rem; flex-shrink: 0; }
.article-affiliate-body { flex: 1; }
.article-affiliate-body strong { display: block; font-size: var(--text-base); font-weight: 700; margin-bottom: var(--space-2); }
.article-affiliate-body p { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0 0 var(--space-3); max-width: none; }

/* ======= NEWSLETTER / CTA SECTION ======= */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-ai));
  border-radius: var(--radius-2xl);
  padding: var(--space-16) var(--space-12);
  text-align: center;
  color: white;
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-section h2 { font-size: var(--text-2xl); margin-bottom: var(--space-4); position: relative; z-index: 1; color: white; }
.cta-section p { font-size: var(--text-base); opacity: 0.9; margin-bottom: var(--space-8); position: relative; z-index: 1; max-width: 55ch; margin-left: auto; margin-right: auto; }
.cta-section .btn-white { background: white; color: var(--color-primary); font-weight: 700; position: relative; z-index: 1; }
.cta-section .btn-white:hover { background: #f0f0f0; color: var(--color-primary-hover); }

/* ======= STATS BAR ======= */
.stats-bar {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-8) 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); text-align: center; }
.stat-item strong { display: block; font-size: var(--text-xl); font-weight: 800; font-family: var(--font-display); color: var(--color-primary); }
.stat-item span { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }

/* ======= TABS ======= */
.tab-nav {
  display: flex; gap: var(--space-2); border-bottom: 2px solid var(--color-divider);
  margin-bottom: var(--space-10); overflow-x: auto;
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  font-size: var(--text-sm); font-weight: 600;
  color: var(--color-text-muted); cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition-interactive);
  white-space: nowrap;
  background: none; border-left: none; border-right: none; border-top: none;
}
.tab-btn:hover { color: var(--color-text); background: var(--color-surface-offset); }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-btn.active-ai { color: var(--color-ai); border-bottom-color: var(--color-ai); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ======= FOOTER ======= */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-20);
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: var(--space-10); margin-bottom: var(--space-12); }
.footer-brand p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-4); max-width: 32ch; line-height: 1.6; }
.footer-col h4 { font-size: var(--text-sm); font-weight: 700; margin-bottom: var(--space-5); }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col ul li a { font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: none; transition: color var(--transition-interactive); }
.footer-col ul li a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-6);
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-4);
}
.footer-bottom p { font-size: var(--text-xs); color: var(--color-text-faint); }
.footer-disclaimer { font-size: var(--text-xs); color: var(--color-text-faint); max-width: 55ch; }

/* ======= RESPONSIVE ======= */
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .articles-grid.featured { grid-template-columns: 1fr; }
  .articles-grid.featured .card-featured { grid-row: auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .affiliate-banner { flex-direction: column; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .cta-section { padding: var(--space-10) var(--space-6); }
}
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-6);
}
.nav-mobile.open { display: flex; }
.nav-mobile a { padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); font-weight: 500; color: var(--color-text-muted); text-decoration: none; display: flex; align-items: center; gap: var(--space-3); }
.nav-mobile a:hover { background: var(--color-surface-offset); color: var(--color-text); }
.nav-mobile a.active { color: var(--color-primary); background: var(--color-primary-highlight); }

/* ======= UTILITIES ======= */
.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; }
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-8 { margin-bottom: var(--space-8); }
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-in.visible { opacity: 1; transform: none; }