/* ===== CSS VARIABLES ===== */
:root {
  --bg: #f8f9fc;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --text: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-bg: #eff6ff;
  --accent: #7c3aed;
  --green: #059669;
  --green-bg: #ecfdf5;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --amber: #d97706;
  --amber-bg: #fffbeb;
  --hero-from: #0f172a;
  --hero-to: #1e40af;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --max-width: 1140px;
  --max-width-article: 800px;
  --header-height: 68px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --bg-card: #1a1b26;
    --bg-elevated: #1e1f32;
    --text: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border: #27272a;
    --border-light: #1f1f23;
    --primary-light: #1e3a5f;
    --primary-bg: #0f1a2e;
    --green-bg: #052e16;
    --red-bg: #450a0a;
    --amber-bg: #451a03;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
  }
  .article-card, .category-card, .author-box, .toc-card { --bg-card: #1a1b26; }
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font);
  font-size: 17px; line-height: 1.75; color: var(--text); background: var(--bg);
  transition: background 0.3s, color 0.3s;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

/* ===== LAYOUT ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: var(--max-width-article); margin: 0 auto; padding: 0 24px; }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 { line-height: 1.3; color: var(--text); font-weight: 800; }

/* ===== HEADER ===== */
.site-header {
  background: var(--bg-card); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100; height: var(--header-height);
  backdrop-filter: blur(12px); background: rgba(255,255,255,0.85);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(15,17,23,0.85); }
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.header-left { display: flex; align-items: center; gap: 40px; }
.site-logo { font-size: 22px; font-weight: 900; color: var(--text); letter-spacing: -0.5px; }
.site-logo span { color: var(--primary); }
.site-logo:hover { text-decoration: none; }
.nav-links { display: flex; gap: 8px; list-style: none; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  padding: 8px 14px; border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-bg); text-decoration: none; }
.nav-links a.active { color: var(--primary); background: var(--primary-bg); font-weight: 600; }
.header-right { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); padding: 4px; }

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, var(--hero-from) 0%, var(--hero-to) 100%);
  color: #fff; padding: 80px 0 72px; text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(37,99,235,0.3) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(124,58,237,0.2) 0%, transparent 60%);
}
.hero .container { position: relative; z-index: 1; }
.hero-badge {
  display: inline-block; background: rgba(255,255,255,0.12); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2); padding: 6px 16px; border-radius: 20px;
  font-size: 13px; font-weight: 600; color: #93c5fd; margin-bottom: 24px; letter-spacing: 0.3px;
}
.hero h1 { font-size: 48px; font-weight: 900; line-height: 1.15; margin-bottom: 16px; letter-spacing: -1px; }
.hero h1 span { background: linear-gradient(135deg, #60a5fa, #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 20px; opacity: 0.85; max-width: 600px; margin: 0 auto 32px; line-height: 1.6; }
.hero-search {
  display: flex; max-width: 560px; margin: 0 auto;
  background: rgba(255,255,255,0.1); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2); border-radius: 12px; overflow: hidden;
}
.hero-search input {
  flex: 1; padding: 16px 20px; border: none; background: transparent;
  font-size: 16px; color: #fff; outline: none; font-family: var(--font);
}
.hero-search input::placeholder { color: rgba(255,255,255,0.5); }
.hero-search button {
  padding: 16px 28px; background: #fff; color: #1e40af; border: none;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: all 0.2s; font-family: var(--font);
}
.hero-search button:hover { background: #f0f0f0; }
.hero-stats {
  display: flex; justify-content: center; gap: 40px; margin-top: 32px;
  font-size: 14px; color: rgba(255,255,255,0.7);
}
.hero-stats span { font-weight: 700; color: #fff; }

/* ===== SECTION HEADERS ===== */
.section { padding: 56px 0; }
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 32px;
}
.section-header h2 { font-size: 28px; font-weight: 800; letter-spacing: -0.5px; }
.section-header a { font-size: 15px; font-weight: 500; color: var(--primary); }

/* ===== CATEGORY GRID ===== */
.category-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 16px;
}
.category-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 20px; text-align: center;
  transition: all 0.25s; cursor: pointer;
}
.category-card:hover {
  border-color: var(--primary); box-shadow: var(--shadow-md);
  transform: translateY(-2px); text-decoration: none;
}
.category-card .icon { font-size: 32px; margin-bottom: 8px; display: block; }
.category-card .name { font-size: 14px; font-weight: 600; color: var(--text); }
.category-card .count { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ===== ARTICLE CARDS ===== */
.article-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }
.article-grid--featured { grid-template-columns: 1fr 1fr; gap: 24px; }
.article-grid--featured > :first-child { grid-column: 1 / -1; }

.article-card {
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: all 0.25s;
  display: flex; flex-direction: column;
}
.article-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

.article-card-image {
  height: 200px; background: linear-gradient(135deg, var(--primary-bg), var(--primary-light));
  display: flex; align-items: center; justify-content: center;
  font-size: 48px; position: relative; overflow: hidden;
}
.article-card-image::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(0deg, rgba(0,0,0,0.03) 0%, transparent 50%);
}
.article-card-image .label {
  position: absolute; top: 16px; left: 16px; z-index: 1;
}
.article-card-image--tall { height: 280px; }
.article-card-image--small { height: 160px; }

.article-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.article-card-body .article-meta { margin-bottom: 8px; }
.article-card h3 { font-size: 20px; font-weight: 700; line-height: 1.35; margin-bottom: 8px; letter-spacing: -0.3px; }
.article-card h3 a { color: var(--text); }
.article-card h3 a:hover { color: var(--primary); text-decoration: none; }
.article-excerpt { font-size: 15px; color: var(--text-secondary); line-height: 1.6; flex: 1; }
.article-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; border-top: 1px solid var(--border-light); margin-top: 16px;
}
.article-card-footer .read-more { font-size: 14px; font-weight: 600; color: var(--primary); }
.article-card-footer .read-time { font-size: 13px; color: var(--text-muted); }

/* Label / Category Badge */
.label {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: 20px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.label--review { background: var(--green-bg); color: var(--green); }
.label--comparison { background: var(--primary-bg); color: var(--primary); }
.label--guide { background: var(--amber-bg); color: var(--amber); }

.article-meta { font-size: 14px; color: var(--text-muted); display: flex; align-items: center; gap: 8px; }
.article-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--text-muted); display: inline-block; }

/* ===== NEWSLETTER ===== */
.newsletter {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border-radius: var(--radius-lg); padding: 48px; text-align: center;
  margin: 48px 0;
}
.newsletter h2 { color: #fff; font-size: 28px; margin-bottom: 8px; }
.newsletter p { color: rgba(255,255,255,0.7); font-size: 16px; margin-bottom: 24px; }
.newsletter-form { display: flex; max-width: 480px; margin: 0 auto; gap: 8px; }
.newsletter-form input {
  flex: 1; padding: 14px 18px; border-radius: var(--radius-sm); border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1); color: #fff; font-size: 15px; outline: none; font-family: var(--font);
}
.newsletter-form input::placeholder { color: rgba(255,255,255,0.4); }
.newsletter-form button {
  padding: 14px 28px; background: var(--primary); color: #fff; border: none;
  border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; cursor: pointer;
  transition: background 0.2s; font-family: var(--font); white-space: nowrap;
}
.newsletter-form button:hover { background: var(--primary-dark); }

/* ===== ARTICLE LAYOUT ===== */
.article-page { padding: 32px 0 64px; }
.breadcrumbs {
  display: flex; align-items: center; gap: 8px; font-size: 14px;
  color: var(--text-muted); margin-bottom: 32px; flex-wrap: wrap;
}
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs a:hover { color: var(--primary); }
.breadcrumbs .sep { color: var(--text-muted); font-size: 12px; }
.breadcrumbs .current { color: var(--text-secondary); }

.article-page .article-header { margin-bottom: 32px; }
.article-page .article-header h1 { font-size: 40px; font-weight: 900; line-height: 1.2; margin-bottom: 16px; letter-spacing: -1px; }
.article-page .article-header .article-meta { font-size: 15px; }
.author-line {
  display: flex; align-items: center; gap: 12px; margin-top: 20px;
  padding-top: 20px; border-top: 1px solid var(--border);
}
.author-avatar {
  width: 48px; height: 48px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 18px;
}
.author-info .name { font-size: 15px; font-weight: 600; color: var(--text); }
.author-info .role { font-size: 13px; color: var(--text-muted); }

.content-with-sidebar {
  display: grid; grid-template-columns: 1fr 300px; gap: 48px;
}

.article-body h2 {
  font-size: 28px; font-weight: 700; margin: 48px 0 16px; color: var(--text);
  letter-spacing: -0.5px;
}
.article-body h3 { font-size: 22px; font-weight: 600; margin: 32px 0 12px; color: var(--text); }
.article-body p { margin-bottom: 20px; color: var(--text-secondary); }
.article-body ul, .article-body ol { margin: 0 0 20px 24px; color: var(--text-secondary); }
.article-body li { margin-bottom: 8px; }
.article-body a { font-weight: 500; }
.article-body blockquote {
  border-left: 4px solid var(--primary); padding: 16px 24px; margin: 24px 0;
  background: var(--primary-bg); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary); font-style: italic;
}
.article-body .table-wrap { overflow-x: auto; margin: 32px 0; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.article-body table { width: 100%; border-collapse: collapse; font-size: 15px; }
.article-body th, .article-body td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); }
.article-body th { background: var(--bg); font-weight: 600; color: var(--text); font-size: 14px; text-transform: uppercase; letter-spacing: 0.3px; }
.article-body tr:last-child td { border-bottom: none; }
.article-body tr:hover td { background: var(--border-light); }

/* ===== PROS/CONS ===== */
.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin: 32px 0; }
.pros, .cons { padding: 24px; border-radius: var(--radius); }
.pros { background: var(--green-bg); border: 1px solid var(--green); }
.cons { background: var(--red-bg); border: 1px solid var(--red); }
.pros h3, .cons h3 { font-size: 18px; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.pros h3 { color: var(--green); }
.cons h3 { color: var(--red); }
.pros ul, .cons ul { list-style: none; margin: 0; }
.pros li, .cons li { padding: 4px 0 4px 24px; position: relative; font-size: 15px; color: var(--text-secondary); }
.pros li::before { content: "✓"; color: var(--green); position: absolute; left: 0; font-weight: 700; }
.cons li::before { content: "✗"; color: var(--red); position: absolute; left: 0; font-weight: 700; }

/* ===== COMPARISON BOX ===== */
.comparison-box {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  margin: 32px 0; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); background: var(--border);
}
.comparison-col { padding: 28px; background: var(--bg-card); }
.comparison-col h3 { font-size: 18px; margin-bottom: 12px; }
.comparison-col ul { list-style: none; margin: 0; }
.comparison-col li { padding: 4px 0 4px 20px; position: relative; font-size: 14px; color: var(--text-secondary); }

/* ===== AD UNITS ===== */
.ad-container { text-align: center; overflow: hidden; }
.ad-container--leaderboard { min-height: 90px; margin: 32px 0; }
.ad-container--in-content { min-height: 250px; margin: 40px 0; }
.ad-container--sidebar { min-height: 600px; margin: 0 0 32px; }
.ad-container--footer { min-height: 90px; margin: 48px 0 0; }
.ad-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
.ad-placeholder {
  background: var(--border-light); border: 2px dashed var(--border); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 14px; font-weight: 500;
}

/* ===== SIDEBAR ===== */
.sidebar { position: sticky; top: calc(var(--header-height) + 16px); align-self: start; }
.sidebar-section {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 24px;
}
.sidebar-section h3 {
  font-size: 16px; font-weight: 700; margin-bottom: 16px; color: var(--text);
  padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.sidebar-links { list-style: none; }
.sidebar-links li { margin-bottom: 10px; }
.sidebar-links a { font-size: 14px; color: var(--text-secondary); line-height: 1.4; }
.sidebar-links a:hover { color: var(--primary); }

/* ===== RELATED ARTICLES ===== */
.related-section { margin-top: 64px; padding-top: 48px; border-top: 1px solid var(--border); }
.related-section h2 { font-size: 24px; font-weight: 800; margin-bottom: 24px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.related-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; transition: all 0.2s;
}
.related-card:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.related-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.related-card h3 a { color: var(--text); }
.related-card h3 a:hover { color: var(--primary); text-decoration: none; }
.related-card .article-meta { font-size: 13px; }

/* ===== AUTHOR BOX ===== */
.author-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; margin-top: 48px;
  display: flex; align-items: flex-start; gap: 20px;
}
.author-box .avatar {
  width: 64px; height: 64px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 24px; flex-shrink: 0;
}
.author-box .info h3 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.author-box .info p { font-size: 15px; color: var(--text-secondary); line-height: 1.6; margin: 0; }

/* ===== STATIC PAGES ===== */
.static-page { padding: 48px 0; max-width: 720px; margin: 0 auto; }
.static-page h1 { font-size: 36px; font-weight: 800; margin-bottom: 24px; letter-spacing: -0.5px; }
.static-page h2 { font-size: 24px; font-weight: 700; margin: 40px 0 16px; }
.static-page p { margin-bottom: 16px; color: var(--text-secondary); }

/* ===== FOOTER ===== */
.site-footer {
  background: #0f1117; color: #a1a1aa; padding: 56px 0 32px; margin-top: 64px;
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand h3 { color: #fff; font-size: 20px; margin-bottom: 8px; }
.footer-brand p { font-size: 14px; line-height: 1.7; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.5px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #a1a1aa; font-size: 14px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #27272a; padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 36px; height: 36px; border-radius: 50%; background: #1a1b26; display: flex; align-items: center; justify-content: center; color: #a1a1aa; font-size: 16px; transition: all 0.2s; }
.footer-social a:hover { background: var(--primary); color: #fff; text-decoration: none; }

/* ===== READING PROGRESS BAR ===== */
.progress-bar {
  position: fixed; top: 0; left: 0; width: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 999; transition: width 0.1s;
}

/* ===== SCROLL TO TOP ===== */
.scroll-top {
  position: fixed; bottom: 24px; right: 24px; width: 44px; height: 44px;
  background: var(--bg-card); color: var(--text); border: 1px solid var(--border);
  border-radius: 50%; font-size: 20px; cursor: pointer; opacity: 0;
  transition: all 0.3s; box-shadow: var(--shadow); z-index: 99;
  display: flex; align-items: center; justify-content: center;
}
.scroll-top.visible { opacity: 1; }
.scroll-top:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== TOC CARD ===== */
.toc-card { background: var(--primary-bg); border: 1px solid var(--primary-light); border-radius: var(--radius); padding: 24px; margin: 32px 0; }
.toc-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 16px; }
.toc-card ul { list-style: none; margin: 0; }
.toc-card li { margin-bottom: 8px; }
.toc-card a { font-size: 15px; color: var(--text-secondary); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  body { font-size: 16px; }
  .hero { padding: 56px 0 48px; }
  .hero h1 { font-size: 30px; letter-spacing: -0.5px; }
  .hero p { font-size: 17px; }
  .hero-search { flex-direction: column; border-radius: var(--radius-sm); }
  .hero-search input { padding: 14px 16px; }
  .hero-search button { padding: 12px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .article-page .article-header h1 { font-size: 28px; }
  .article-body h2 { font-size: 22px; }
  .article-grid { grid-template-columns: 1fr; }
  .article-grid--featured { grid-template-columns: 1fr; }
  .article-grid--featured > :first-child { grid-column: 1; }
  .nav-links {
    display: none; position: absolute; top: var(--header-height); left: 0; right: 0;
    background: var(--bg-card); flex-direction: column; padding: 8px 16px;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .content-with-sidebar { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .pros-cons { grid-template-columns: 1fr; }
  .comparison-box { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .newsletter { padding: 32px 24px; }
  .newsletter-form { flex-direction: column; }
  .category-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; }
  .author-box { flex-direction: column; align-items: center; text-align: center; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero { padding: 40px 0 36px; }
  .hero h1 { font-size: 24px; }
  .section { padding: 32px 0; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 8px; }
  .article-card-body { padding: 18px; }
  .article-card-footer { padding: 14px 18px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
}