/* Negency Lab Pilot — mobile-first, AdSense-ready layout */
:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface2: #243044;
  --text: #e8eef6;
  --muted: #9aabb8;
  --accent: #3d9cf0;
  --accent2: #5eead4;
  --border: #2d3a4d;
  --link: #6bb3f7;
  --radius: 10px;
  --max: 720px;
  --wide: 960px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #000; padding: .5rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0; }
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: .75rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  flex-wrap: wrap;
}
.logo {
  font-weight: 700; font-size: 1.15rem; color: var(--text);
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent2); }
.nav { display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; }
.nav a { color: var(--muted); font-size: .95rem; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}
.wrap-wide { max-width: var(--wide); }
.hero {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.25; margin: 0 0 .75rem;
  letter-spacing: -0.03em;
}
.hero p.lead { color: var(--muted); font-size: 1.1rem; margin: 0 0 1.25rem; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #061018 !important;
  font-weight: 600;
  padding: .65rem 1.2rem;
  border-radius: var(--radius);
  text-decoration: none !important;
}
.btn:hover { filter: brightness(1.08); }
.btn-ghost {
  background: transparent;
  color: var(--accent) !important;
  border: 1px solid var(--border);
  margin-left: .5rem;
}
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}
@media (min-width: 640px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color .15s;
}
.card:hover { border-color: var(--accent); }
.card h2, .card h3 { margin: 0 0 .5rem; font-size: 1.1rem; }
.card h2 a, .card h3 a { color: var(--text); }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.meta { color: var(--muted); font-size: .85rem; margin-bottom: 1rem; }
article h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  line-height: 1.3; margin: 0 0 .5rem;
  letter-spacing: -0.02em;
}
article h2 {
  font-size: 1.35rem;
  margin: 2rem 0 .75rem;
  padding-top: .5rem;
  border-top: 1px solid var(--border);
}
article h3 { font-size: 1.15rem; margin: 1.5rem 0 .5rem; }
article p { margin: 0 0 1rem; }
article ul, article ol { margin: 0 0 1rem; padding-left: 1.35rem; }
article li { margin-bottom: .4rem; }
article code, .inline-code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--surface2);
  padding: .12em .4em;
  border-radius: 4px;
}
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  overflow-x: auto;
  margin: 0 0 1.25rem;
  font-size: .88rem;
  line-height: 1.5;
}
pre code { background: none; padding: 0; }
.ad-slot {
  margin: 1.75rem 0;
  padding: 1rem;
  min-height: 90px;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: .8rem;
  text-align: center;
  display: flex; align-items: center; justify-content: center;
}
.callout {
  background: var(--surface);
  border-left: 3px solid var(--accent2);
  padding: 1rem 1.15rem;
  margin: 1.25rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 2rem 1.25rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: .9rem;
}
.footer-inner {
  max-width: var(--wide);
  margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 1.5rem;
  justify-content: space-between;
}
.footer-nav { display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; }
.footer-nav a { color: var(--muted); }
.breadcrumb { font-size: .85rem; color: var(--muted); margin-bottom: 1rem; }
.breadcrumb a { color: var(--muted); }
.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1rem 0 1.5rem;
}
.toc strong { display: block; margin-bottom: .5rem; }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc li { margin-bottom: .25rem; font-size: .95rem; }
.prose-list { list-style: none; padding: 0; }
.prose-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.prose-list li:last-child { border-bottom: none; }
.tag {
  display: inline-block;
  font-size: .75rem;
  background: var(--surface2);
  color: var(--accent2);
  padding: .2rem .5rem;
  border-radius: 4px;
  margin-right: .35rem;
}