:root {
  --ink: #0A0A0F;
  --paper: #ffffff;
  --text: #1f2430;
  --muted: #6a7183;
  --rule: #e7e9ef;
  --blue: #1A6DFF;
  --panel: #f6f7fb;
  --maxw: 720px;
  --sans: 'Satoshi', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--text);
  font-family: var(--sans); line-height: 1.65; font-size: 18px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* header / footer */
.site-head, .site-foot {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1040px; margin: 0 auto; padding: 20px 24px;
}
.site-head { border-bottom: 1px solid var(--rule); }
.brand { font-weight: 800; letter-spacing: 3px; color: var(--ink); font-size: 15px; }
.site-head nav { display: flex; gap: 22px; align-items: center; font-size: 15px; }
.site-head nav a { color: var(--text); }
.site-head nav .cta { background: var(--blue); color: #fff; padding: 8px 16px; border-radius: 8px; }
.site-head nav .cta:hover { text-decoration: none; opacity: .92; }
.site-foot { border-top: 1px solid var(--rule); color: var(--muted); font-size: 13px; margin-top: 64px; }
.site-foot span:first-child { font-weight: 800; letter-spacing: 3px; color: var(--ink); }

main { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* index */
.hero { padding: 56px 0 12px; }
.eyebrow { color: var(--blue); font-weight: 800; letter-spacing: 3px; font-size: 12px; text-transform: uppercase; margin: 0 0 12px; }
.hero h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.1; letter-spacing: -.02em; margin: 0 0 14px; color: var(--ink); }
.lede { color: var(--muted); font-size: 19px; margin: 0; }
.post-list { list-style: none; padding: 0; margin: 40px 0 0; }
.post-list li { border-top: 1px solid var(--rule); }
.post-list a { display: grid; gap: 4px; padding: 22px 0; color: var(--text); }
.post-list a:hover { text-decoration: none; }
.post-date { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 1px; }
.post-title { font-size: 22px; font-weight: 700; color: var(--ink); line-height: 1.25; }
.post-desc { color: var(--muted); font-size: 16px; }

/* article */
.prose { padding: 48px 0 0; }
.prose h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.12; letter-spacing: -.02em; margin: 8px 0 12px; color: var(--ink); text-wrap: balance; }
.prose .meta { color: var(--muted); font-size: 14px; margin: 0 0 32px; }
.prose h2 { font-size: 26px; line-height: 1.2; margin: 44px 0 12px; color: var(--ink); letter-spacing: -.01em; }
.prose h3 { font-size: 20px; margin: 28px 0 8px; color: var(--ink); }
.prose p { margin: 0 0 18px; }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose strong { color: var(--ink); }
.prose a { text-decoration: underline; }
.prose blockquote { border-left: 3px solid var(--blue); margin: 24px 0; padding: 4px 0 4px 20px; color: var(--muted); }
.prose code { background: var(--panel); padding: 2px 6px; border-radius: 4px; font-size: .9em; }
.prose pre { background: var(--panel); padding: 18px; border-radius: 10px; overflow-x: auto; font-size: 14px; }
.prose table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--rule); padding: 10px 12px; text-align: left; }
.prose th { background: var(--panel); font-weight: 700; }

/* faq + cta */
.faq { margin-top: 48px; border-top: 1px solid var(--rule); padding-top: 8px; }
.faq-item { margin: 20px 0; }
.faq-item h3 { margin: 0 0 4px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-box { margin: 56px 0; background: var(--panel); border: 1px solid var(--rule); border-radius: 14px; padding: 32px; text-align: center; }
.cta-box h2 { margin: 0 0 8px; }
.cta-box p { color: var(--muted); max-width: 46ch; margin: 0 auto 18px; }
.btn { display: inline-block; background: var(--blue); color: #fff; padding: 13px 22px; border-radius: 10px; font-weight: 700; }
.btn:hover { text-decoration: none; opacity: .92; }

@media (max-width: 600px) {
  body { font-size: 17px; }
  .prose h2 { font-size: 23px; }
}