:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #f59e0b;
  --text: #111827;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-light: #f9fafb;
  --border: #e5e7eb;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', -apple-system, sans-serif; color: var(--text); background: var(--bg); line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
/* Header */
header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-size: 1.3rem; font-weight: 800; color: var(--text); }
.logo span { color: var(--primary); }
nav { display: flex; gap: 24px; }
nav a { color: var(--text-light); font-size: 0.9rem; font-weight: 500; }
nav a:hover { color: var(--primary); text-decoration: none; }
.nav-cta { background: var(--primary); color: #fff !important; padding: 8px 16px; border-radius: 8px; }
.nav-cta:hover { background: var(--primary-dark); }
/* Hero */
.hero { background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%); padding: 80px 24px; text-align: center; }
.hero h1 { font-size: 2.8rem; font-weight: 800; line-height: 1.15; margin-bottom: 16px; color: var(--text); }
.hero p { font-size: 1.15rem; color: var(--text-light); max-width: 560px; margin: 0 auto 32px; }
.btn-primary { display: inline-block; background: var(--primary); color: #fff; padding: 16px 36px; border-radius: var(--radius); font-weight: 800; font-size: 1.05rem; margin-right: 12px; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { display: inline-block; background: #fff; color: var(--text); border: 2px solid var(--border); padding: 14px 28px; border-radius: var(--radius); font-weight: 700; font-size: 1rem; }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
@media(max-width:600px) { .hero h1 { font-size: 1.9rem; } .btn-primary, .btn-secondary { display: block; margin: 8px auto; max-width: 280px; text-align: center; } }
/* Cards section */
.cards-section { padding: 60px 24px; }
.cards-section h2 { text-align: center; font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; }
.cards-section .subtitle { text-align: center; color: var(--text-light); margin-bottom: 40px; }
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; max-width: 1200px; margin: 0 auto; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-badge { display: inline-block; background: var(--primary); color: #fff; font-size: 0.75rem; font-weight: 700; padding: 3px 10px; border-radius: 20px; margin-bottom: 12px; }
.card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.card p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 16px; }
.card .card-link { display: block; text-align: center; background: var(--primary); color: #fff; padding: 10px; border-radius: var(--radius); font-weight: 600; margin-top: 16px; }
.card .card-link:hover { background: var(--primary-dark); text-decoration: none; }
/* Stats bar */
.stats-bar { background: var(--primary-dark); color: #fff; padding: 40px 24px; }
.stats-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
@media(max-width:600px) { .stats-grid { grid-template-columns: repeat(2,1fr); } }
.stat-number { font-size: 2.2rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.9rem; opacity: 0.8; margin-top: 4px; }
/* Tool CTA */
.tool-cta { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; padding: 60px 24px; text-align: center; }
.tool-cta h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.tool-cta p { font-size: 1.1rem; opacity: 0.9; max-width: 560px; margin: 0 auto 28px; }
.tool-cta .btn-tool { display: inline-block; background: #fff; color: var(--primary-dark); padding: 16px 36px; border-radius: var(--radius); font-weight: 800; font-size: 1.05rem; }
.tool-cta .btn-tool:hover { background: #eff6ff; text-decoration: none; }
/* Blog grid */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
/* Article */
.content-grid { display: grid; grid-template-columns: 1fr 300px; gap: 40px; padding: 40px 0; }
@media(max-width:900px) { .content-grid { grid-template-columns: 1fr; } }
.article-body h2 { font-size: 1.4rem; font-weight: 700; margin: 32px 0 12px; color: var(--text); }
.article-body h3 { font-size: 1.15rem; font-weight: 700; margin: 24px 0 10px; }
.article-body p { margin-bottom: 16px; color: var(--text); line-height: 1.75; }
.article-body ul, .article-body ol { margin: 0 0 16px 24px; }
.article-body li { margin-bottom: 8px; line-height: 1.7; }
.article-body table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 0.9rem; }
.article-body th { background: var(--primary); color: #fff; padding: 12px; text-align: left; }
.article-body td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.article-body tr:nth-child(even) td { background: var(--bg-light); }
.cta-box { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; border-radius: var(--radius); padding: 32px; margin: 40px 0; text-align: center; }
.cta-box h3 { font-size: 1.4rem; margin-bottom: 12px; }
.cta-box p { opacity: 0.9; margin-bottom: 24px; }
/* Sidebar */
.sidebar-card { background: var(--bg-light); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 24px; }
.sidebar-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; color: var(--primary-dark); }
/* Newsletter */
.newsletter { background: var(--bg-light); padding: 60px 24px; text-align: center; border-top: 1px solid var(--border); }
.newsletter h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; }
.newsletter p { color: var(--text-light); margin-bottom: 24px; }
.newsletter-form { display: flex; gap: 12px; max-width: 480px; margin: 0 auto; }
.newsletter-form input { flex: 1; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 1rem; }
.newsletter-form button { background: var(--primary); color: #fff; border: none; padding: 12px 24px; border-radius: var(--radius); font-weight: 700; cursor: pointer; }
@media(max-width:500px) { .newsletter-form { flex-direction: column; } }
/* Footer */
footer { background: #111827; color: rgba(255,255,255,0.7); padding: 48px 24px 24px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 2fr; gap: 48px; margin-bottom: 32px; }
@media(max-width:700px) { .footer-inner { grid-template-columns: 1fr; } }
.footer-logo { font-size: 1.3rem; font-weight: 800; color: #fff; margin-bottom: 12px; }
.footer-logo span { color: var(--primary); }
.footer-brand p { font-size: 0.85rem; line-height: 1.6; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer-links div { display: flex; flex-direction: column; gap: 8px; }
.footer-links strong { color: #fff; font-size: 0.85rem; margin-bottom: 4px; }
.footer-links a { color: rgba(255,255,255,0.6); font-size: 0.85rem; }
.footer-links a:hover { color: #fff; text-decoration: none; }
.footer-bottom { max-width: 1200px; margin: 0 auto; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.8rem; text-align: center; }
/* Breadcrumb */
.breadcrumb { padding: 16px 0; font-size: 0.85rem; color: var(--text-light); }
.breadcrumb a { color: var(--text-light); }
.breadcrumb span { margin: 0 6px; }