@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --primary: #2196F3;
  --primary-dark: #1976D2;
  --primary-light: #42A5F5;
  --green: #4CAF50;
  --orange: #FF9800;
  --purple: #9C27B0;
  --text-dark: #263238;
  --text-gray: #546E7A;
  --bg-light: #F5F7FA;
  --white: #ffffff;
  --border: #E0E6ED;
  --shadow: 0 2px 12px rgba(33,150,243,.08);
  --shadow-lg: 0 8px 32px rgba(33,150,243,.12);
  --radius: 12px;
  --radius-sm: 8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: var(--text-dark); line-height: 1.7; background: var(--white); }
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }

/* ── Navbar ── */
.navbar { position: sticky; top: 0; background: var(--white); border-bottom: 1px solid var(--border); z-index: 100; padding: .85rem 0; }
.nav-container { max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 800; font-size: 1.3rem; color: var(--primary); }
.nav-links { list-style: none; display: flex; gap: 1.8rem; align-items: center; }
.nav-links a { color: var(--text-gray); font-weight: 500; font-size: .95rem; }
.nav-links a:hover { color: var(--primary); }
.cta-nav { background: var(--primary); color: var(--white) !important; padding: .5rem 1.2rem; border-radius: var(--radius-sm); }
.cta-nav:hover { background: var(--primary-dark); color: var(--white) !important; }

/* ── Article Hero ── */
.article-hero { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%); color: var(--white); padding: 4rem 1.5rem 3.5rem; text-align: center; }
.article-hero .breadcrumb { font-size: .85rem; opacity: .85; margin-bottom: 1rem; }
.article-hero .breadcrumb a { color: var(--white); opacity: .9; }
.article-hero h1 { font-size: 2.4rem; font-weight: 800; max-width: 780px; margin: 0 auto .8rem; line-height: 1.2; }
.article-hero h1 span { background: linear-gradient(90deg, #fff 0%, #BBDEFB 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.article-hero .subtitle { font-size: 1.15rem; opacity: .9; max-width: 620px; margin: 0 auto; }

/* ── Article Body ── */
.article-body { max-width: 960px; margin: 0 auto; padding: 3rem 1.5rem; }
.article-container { max-width: 860px; margin: 0 auto; }
.article-body h2 { font-size: 1.6rem; font-weight: 700; margin: 2.5rem 0 1rem; color: var(--text-dark); }
.article-body h3 { font-size: 1.2rem; font-weight: 600; margin: 1.8rem 0 .6rem; }
.article-body p { margin-bottom: 1.1rem; color: var(--text-gray); font-size: 1.05rem; }

/* ── Info Grid ── */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; margin: 2rem 0; }
.info-card { background: var(--bg-light); border-radius: var(--radius); padding: 1.5rem; border-left: 4px solid var(--primary); }
.info-card.green { border-left-color: var(--green); }
.info-card.orange { border-left-color: var(--orange); }
.info-card.purple { border-left-color: var(--purple); }
.info-card h3 { margin: 0 0 .5rem; font-size: 1.05rem; }
.info-card p { margin: 0; font-size: .95rem; }
.info-card i { margin-bottom: .5rem; display: inline-block; color: var(--primary); }
.info-card.green i { color: var(--green); }
.info-card.orange i { color: var(--orange); }
.info-card.purple i { color: var(--purple); }

/* ── Comparison Table ── */
.comparison-table { width: 100%; border-collapse: collapse; margin: 2rem 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.comparison-table th { background: var(--primary); color: var(--white); padding: .85rem 1rem; text-align: left; font-weight: 600; font-size: .95rem; }
.comparison-table td { padding: .75rem 1rem; border-bottom: 1px solid var(--border); font-size: .95rem; color: var(--text-gray); }
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:nth-child(even) { background: var(--bg-light); }

/* ── Highlight Box ── */
.highlight-box { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: var(--white); border-radius: var(--radius); padding: 2.5rem; text-align: center; margin: 2.5rem 0; }
.highlight-box h3 { font-size: 1.4rem; margin-bottom: .6rem; color: var(--white); }
.highlight-box p { opacity: .9; margin-bottom: 1.2rem; color: var(--white); }
.highlight-box .btn { display: inline-block; background: var(--white); color: var(--primary-dark); font-weight: 700; padding: .75rem 2rem; border-radius: var(--radius-sm); font-size: 1rem; transition: transform .2s, box-shadow .2s; }
.highlight-box .btn:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,.15); color: var(--primary-dark); }

/* ── Steps List ── */
.steps-list { counter-reset: step; list-style: none; margin: 2rem 0; }
.steps-list li { counter-increment: step; position: relative; padding: 1.2rem 1.2rem 1.2rem 3.8rem; margin-bottom: 1rem; background: var(--bg-light); border-radius: var(--radius-sm); font-size: 1rem; color: var(--text-gray); }
.steps-list li::before { content: counter(step); position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); width: 2rem; height: 2rem; background: var(--primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .9rem; }

/* ── Related Section ── */
.related-section { background: var(--bg-light); padding: 3rem 1.5rem; margin-top: 2rem; }
.related-section h2 { text-align: center; font-size: 1.5rem; margin-bottom: 2rem; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; max-width: 960px; margin: 0 auto; }
.related-card { background: var(--white); border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s; }
.related-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.related-card h3 { font-size: 1rem; margin-bottom: .5rem; }
.related-card p { font-size: .9rem; color: var(--text-gray); margin-bottom: .8rem; }
.related-card a { font-weight: 600; font-size: .9rem; }

/* ── CTA Section ── */
.article-cta { text-align: center; padding: 3.5rem 1.5rem; }
.article-cta h2 { font-size: 1.8rem; margin-bottom: .8rem; }
.article-cta p { color: var(--text-gray); max-width: 540px; margin: 0 auto 1.5rem; font-size: 1.05rem; }
.article-cta .btn-primary { display: inline-block; background: var(--primary); color: var(--white); font-weight: 700; padding: .85rem 2.2rem; border-radius: var(--radius-sm); font-size: 1.05rem; transition: background .2s, transform .2s; }
.article-cta .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); color: var(--white); }

/* ── Footer ── */
.footer { background: var(--text-dark); color: rgba(255,255,255,.7); text-align: center; padding: 2rem 1.5rem; }
.footer-links { display: flex; justify-content: center; gap: 2rem; margin-bottom: 1rem; flex-wrap: wrap; }
.footer-links a { color: rgba(255,255,255,.8); font-size: .9rem; }
.footer-links a:hover { color: var(--white); }
.footer-copy { font-size: .82rem; opacity: .6; }

/* ── Blog Index Grid ── */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; max-width: 1060px; margin: 2rem auto; padding: 0 1.5rem; }
.blog-card { background: var(--white); border-radius: var(--radius); padding: 1.6rem; box-shadow: var(--shadow); border: 1px solid var(--border); transition: transform .2s, box-shadow .2s; }
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.blog-card .tag { display: inline-block; font-size: .75rem; font-weight: 600; padding: .2rem .6rem; border-radius: 4px; background: #E3F2FD; color: var(--primary-dark); margin-bottom: .6rem; }
.blog-card .tag.industry { background: #E8F5E9; color: #2E7D32; }
.blog-card h3 { font-size: 1.05rem; margin-bottom: .5rem; line-height: 1.3; }
.blog-card p { font-size: .9rem; color: var(--text-gray); margin-bottom: .8rem; }
.blog-card a.read-more { font-weight: 600; font-size: .9rem; color: var(--primary); }

/* ── Schema Badge ── */
.schema-badge { display: inline-flex; align-items: center; gap: .4rem; font-size: .78rem; background: rgba(255,255,255,.2); padding: .25rem .7rem; border-radius: 20px; margin-bottom: .8rem; }

/* ── TOC ── */
.toc { background: var(--bg-light); border-radius: var(--radius); padding: 1.3rem 1.5rem; margin: 1.5rem 0 2rem; }
.toc h4 { font-size: .95rem; margin-bottom: .6rem; color: var(--text-dark); }
.toc ul { list-style: none; }
.toc li { margin-bottom: .4rem; }
.toc a { font-size: .9rem; color: var(--text-gray); }
.toc a:hover { color: var(--primary); }

/* ── Responsive ── */
@media (max-width: 900px) {
  .info-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .blog-grid { grid-template-columns: 1fr 1fr; }
  .article-hero h1 { font-size: 1.9rem; }
}
@media (max-width: 600px) {
  .nav-links { gap: 1rem; font-size: .85rem; }
  .article-hero { padding: 2.5rem 1rem 2rem; }
  .article-hero h1 { font-size: 1.5rem; }
  .article-hero .subtitle { font-size: 1rem; }
  .related-grid, .blog-grid { grid-template-columns: 1fr; }
  .comparison-table { font-size: .85rem; }
  .highlight-box { padding: 1.5rem; }
  .article-body { padding: 2rem 1rem; }
}