:root {
  --brand: #4f46e5;
  --brand-dark: #3730a3;
  --ink: #0f172a;
  --body: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-ink: #0f172a;
  --radius: 12px;
  --wrap: 1080px;
  --prose: 720px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--body);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; font-weight: 700; letter-spacing: -0.02em; }
p { margin-bottom: 0; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.eyebrow {
  font-family: "IBM Plex Mono", monospace; font-size: 0.75rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--brand);
  margin-bottom: 14px;
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 8px; font-weight: 600; font-size: 0.95rem;
  border: 1px solid transparent; cursor: pointer; transition: transform .06s ease, background .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--muted); }
.btn-lg { padding: 15px 28px; font-size: 1rem; }

/* nav */
header.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.86); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; color: var(--ink); font-size: 1.05rem; }
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--body); font-size: 0.92rem; font-weight: 500; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-cta { display: flex; align-items: center; gap: 12px; }
@media (max-width: 820px) { .nav-links { display: none; } }

/* footer */
footer.site { border-top: 1px solid var(--line); padding: 40px 0; font-size: 0.85rem; color: var(--muted); }
.foot-inner { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; align-items: center; }
.foot-links { display: flex; gap: 20px; flex-wrap: wrap; }
.foot-links a { color: var(--muted); }

/* cta band */
.cta-band { background: var(--bg-ink); color: #e2e8f0; text-align: center; padding: 76px 0; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #94a3b8; margin: 14px auto 30px; max-width: 46ch; }

/* ===== blog-specific ===== */

.blog-hero { padding: 56px 0 40px; border-bottom: 1px solid var(--line); background: var(--bg-alt); }
.blog-hero h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); max-width: 24ch; }
.blog-hero p.lead { margin-top: 14px; font-size: 1.05rem; color: var(--muted); max-width: 62ch; }

.blog-grid { display: grid; grid-template-columns: 1fr; gap: 0; padding: 48px 0 90px; }
.post-card { display: block; padding: 26px 0; border-bottom: 1px solid var(--line); }
.post-card:hover { text-decoration: none; }
.post-card:hover h3 { color: var(--brand); }
.post-card .cat { font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--brand); }
.post-card h3 { font-size: 1.3rem; margin: 8px 0 8px; transition: color .15s ease; }
.post-card p { color: var(--muted); font-size: 0.95rem; max-width: 68ch; }
.post-card .meta { margin-top: 10px; font-size: 0.8rem; color: var(--muted); font-family: "IBM Plex Mono", monospace; }

article.post { padding: 48px 0 30px; }
.post-meta { font-size: 0.85rem; color: var(--muted); font-family: "IBM Plex Mono", monospace; margin-bottom: 16px; }
.post-title { font-size: clamp(1.9rem, 4.4vw, 2.7rem); max-width: 22ch; margin-bottom: 18px; }
.post-dek { font-size: 1.15rem; color: var(--muted); max-width: var(--prose); margin-bottom: 8px; }

.prose { max-width: var(--prose); padding: 8px 0 70px; }
.prose > * + * { margin-top: 20px; }
.prose h2 { font-size: 1.5rem; margin-top: 44px; }
.prose h3 { font-size: 1.15rem; margin-top: 32px; }
.prose p { font-size: 1.02rem; }
.prose ul, .prose ol { padding-left: 22px; font-size: 1.02rem; }
.prose li + li { margin-top: 8px; }
.prose strong { color: var(--ink); }
.prose blockquote {
  border-left: 3px solid var(--brand); padding: 4px 0 4px 20px; color: var(--ink);
  font-size: 1.08rem; font-style: italic;
}
.prose code { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; font-size: 0.9em; }
.prose table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 0.92rem; }
.prose th, .prose td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); }
.prose thead th { background: var(--bg-alt); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 36px 0; }

.callout {
  border: 1px solid var(--line); background: var(--bg-alt); border-radius: var(--radius);
  padding: 22px 24px; margin: 32px 0;
}
.callout .eyebrow { margin-bottom: 8px; }
.callout p { font-size: 0.96rem; color: var(--body); }
.callout .btn { margin-top: 14px; }

.related { border-top: 1px solid var(--line); padding: 50px 0 70px; }
.related h2 { font-size: 1.3rem; margin-bottom: 22px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 780px) { .related-grid { grid-template-columns: 1fr; } }
.related-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: block; }
.related-card:hover { border-color: #c7d2fe; text-decoration: none; }
.related-card .cat { font-family: "IBM Plex Mono", monospace; font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--brand); }
.related-card h4 { font-size: 0.98rem; margin: 6px 0 0; color: var(--ink); }