:root {
  --green: #0F4C81;
  --dark: #0F1A2A;
  --gray: #4a5b66;
  --light: #f8fafc;
  --white: #fff;
  --radius: 12px;
  --accent: #1a6bb5;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
}

a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

.section-label {
  display: inline-block; font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em; color: var(--green);
  margin-bottom: 8px;
}
.section-title { font-size: 1.6rem; margin-bottom: 12px; }
.section-sub { color: var(--gray); max-width: 600px; margin-bottom: 36px; }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Skip link */
.skip-link {
  position: absolute; top: -100%; left: 16px;
  background: var(--green); color: var(--white);
  padding: 8px 16px; border-radius: var(--radius);
  z-index: 100; font-weight: 600;
}
.skip-link:focus { top: 16px; }

/* Breadcrumb */
.breadcrumb {
  font-size: 0.85rem; padding: 12px 24px;
  max-width: 1080px; margin: 0 auto; color: var(--gray);
}
.breadcrumb a { color: var(--gray); }
.breadcrumb a:hover { color: var(--green); }

/* Header */
.site-header { border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; background: var(--white); z-index: 50; }
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px; padding-bottom: 14px;
}
.brand { font-size: 1.25rem; font-weight: 700; color: var(--dark); }
.brand:hover { text-decoration: none; }
.nav-links { list-style: none; display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--dark); font-weight: 500; font-size: 0.95rem; }

/* Hero */
.hero { padding: 72px 0 64px; background: var(--light); }
.hero-inner { max-width: 720px; }
.hero-inner h1 { font-size: 2.1rem; line-height: 1.25; margin-bottom: 18px; }
.hero-inner > p { font-size: 1.1rem; color: var(--gray); margin-bottom: 14px; }
.hero-stats {
  display: flex; gap: 40px; margin-top: 28px; padding-top: 24px;
  border-top: 1px solid #e2e8f0;
}
.hero-stat strong { display: block; font-size: 1.5rem; color: var(--dark); }
.hero-stat span { font-size: 0.85rem; color: var(--gray); }

/* Benefits */
.benefits { padding: 72px 0; }
.benefit-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.benefit-card {
  background: var(--light); border-radius: var(--radius); padding: 28px;
  border: 1px solid transparent; transition: border-color .15s, box-shadow .15s;
}
.benefit-card:hover { border-color: #e2e8f0; box-shadow: 0 4px 16px rgba(0,0,0,.05); }
.benefit-icon {
  width: 44px; height: 44px; border-radius: 10px; background: var(--green);
  display: flex; align-items: center; justify-content: center;
  color: var(--white); font-weight: 700; font-size: 1.1rem; margin-bottom: 14px;
}
.benefit-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.benefit-card p { font-size: 0.9rem; color: var(--gray); line-height: 1.6; }
.benefit-card .card-link { font-weight: 600; display: inline-block; margin-top: 10px; font-size: 0.85rem; }

/* How it works */
.how-it-works { padding: 72px 0; background: var(--light); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; counter-reset: step; }
.step-card { position: relative; padding: 32px 24px 24px; }
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%; background: var(--green);
  color: var(--white); font-weight: 700; font-size: 0.95rem; margin-bottom: 16px;
}
.step-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.step-card p { font-size: 0.9rem; color: var(--gray); }

/* Comparison table */
.comparison { padding: 72px 0; }
.comparison-table {
  width: 100%; border-collapse: collapse; margin-top: 8px;
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid #e2e8f0;
}
.comparison-table thead { background: var(--dark); color: var(--white); }
.comparison-table th {
  padding: 14px 20px; text-align: left; font-weight: 600; font-size: 0.9rem;
}
.comparison-table td {
  padding: 12px 20px; border-bottom: 1px solid #e2e8f0; font-size: 0.9rem;
}
.comparison-table tbody tr:last-child td { border-bottom: none; }
.comparison-table tbody tr:nth-child(even) { background: var(--light); }
.check { color: #16a34a; font-weight: 700; }
.cross { color: #94a3b8; }

/* Security */
.security { padding: 72px 0; background: var(--dark); color: var(--white); }
.security-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.security-item {
  padding: 28px; background: rgba(255,255,255,.04); border-radius: var(--radius);
}
.security-item h3 { font-size: 1.05rem; margin-bottom: 8px; }
.security-item p { color: #94a3b8; font-size: 0.9rem; }
.security-item a { color: #94a3b8; text-decoration: underline; }
.security-item a:hover { color: var(--white); }

/* Use cases */
.use-cases { padding: 72px 0; background: var(--light); }
.use-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.use-card {
  background: var(--white); border-radius: var(--radius); padding: 28px;
  border: 1px solid #e2e8f0;
}
.use-card .use-label {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  color: var(--green); margin-bottom: 8px; letter-spacing: .04em;
}
.use-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.use-card p { font-size: 0.9rem; color: var(--gray); }

/* FAQ */
.faq { padding: 72px 0; }
.faq-item {
  max-width: 720px; margin: 0 auto 12px;
  border: 1px solid #e2e8f0; border-radius: var(--radius); overflow: hidden;
}
.faq-q {
  padding: 16px 24px; cursor: pointer; font-size: 0.95rem; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center;
  user-select: none; gap: 16px;
}
.faq-q::after { content: "+"; font-size: 1.25rem; flex-shrink: 0; }
.faq-item.open .faq-q::after { content: "\2212"; }
.faq-a {
  max-height: 0; overflow: hidden; padding: 0 24px;
  color: var(--gray); transition: max-height .3s ease, padding .3s ease;
  font-size: 0.93rem;
}
.faq-item.open .faq-a { max-height: 600px; padding: 0 24px 16px; }

/* Articles hub on homepage */
.articles-hub { padding: 72px 0; }

/* Footer */
.site-footer { padding: 48px 0; background: var(--dark); color: #94a3b8; font-size: 0.9rem; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 32px;
}
.footer-grid h4 { color: var(--white); font-size: 0.95rem; margin-bottom: 12px; }
.footer-grid p { font-size: 0.85rem; line-height: 1.6; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: #94a3b8; font-size: 0.85rem; }
.footer-links a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08); padding-top: 24px;
  font-size: 0.8rem;
}

/* SEO hidden block */
.seo-content { opacity: 0; height: 0; overflow: hidden; position: absolute; }

/* Blog hub */
.blog-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; padding: 48px 0; }
.blog-card {
  border: 1px solid #e2e8f0; border-radius: var(--radius); padding: 28px;
  transition: box-shadow .15s;
}
.blog-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.06); }
.blog-card .tag {
  display: inline-block; font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  color: var(--green); margin-bottom: 8px; letter-spacing: .03em;
}
.blog-card h2 { font-size: 1.15rem; margin-bottom: 8px; }
.blog-card p { color: var(--gray); font-size: 0.95rem; margin-bottom: 12px; }
.blog-card .read { font-weight: 600; color: var(--green); }

/* Article */
article.content { max-width: 720px; margin: 0 auto; padding: 48px 24px; }
article.content h2 { font-size: 1.4rem; margin: 36px 0 12px; }
article.content h3 { font-size: 1.15rem; margin: 24px 0 8px; }
article.content p { margin-bottom: 16px; color: var(--dark); }
article.content ul, article.content ol { margin: 0 0 16px 24px; color: var(--dark); }
article.content li { margin-bottom: 6px; }

.cta-box {
  background: var(--light); border-left: 4px solid var(--green);
  padding: 24px; border-radius: 0 var(--radius) var(--radius) 0; margin: 36px 0;
}
.cta-box p { margin-bottom: 0; }

/* Related */
.related { padding: 48px 0; background: var(--light); }
.related h2 { text-align: center; margin-bottom: 24px; }
.related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.related-grid a {
  display: block; padding: 20px; background: var(--white);
  border-radius: var(--radius); font-weight: 600; color: var(--dark);
  transition: box-shadow .15s;
}
.related-grid a:hover { box-shadow: 0 4px 12px rgba(0,0,0,.08); text-decoration: none; }

/* Blog hero */
.hero--blog { text-align: center; }
.hero--blog h1 { max-width: 720px; margin: 0 auto 12px; }
.hero--blog .lede { max-width: 600px; margin: 0 auto 8px; color: var(--gray); }
.hero--blog .meta { font-size: 0.85rem; color: var(--gray); }

/* Responsive */
@media (max-width: 768px) {
  .hero-stats { flex-direction: column; gap: 16px; }
  .benefit-grid, .steps-grid, .use-grid { grid-template-columns: 1fr 1fr; }
  .security-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-inner h1 { font-size: 1.6rem; }
  .comparison-table { font-size: 0.85rem; }
  .comparison-table th, .comparison-table td { padding: 10px 12px; }
}
@media (max-width: 480px) {
  .benefit-grid, .steps-grid, .use-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
}