:root {
  --bg: #0f1419;
  --surface: #171d25;
  --ink: #e8eef6;
  --muted: #9aa8b8;
  --accent: #5b9fd4;
  --line: color-mix(in srgb, var(--ink) 12%, transparent);
  --max: 52rem;
  --font: "IBM Plex Sans", system-ui, sans-serif;
  --display: Syne, "IBM Plex Sans", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.content-body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
}

.site-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  padding: 0.85rem clamp(1rem, 4vw, 1.75rem);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  z-index: 20;
}
.site-brand {
  font-family: var(--display);
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.site-nav { display: flex; flex-wrap: wrap; gap: 0.35rem 0.75rem; }
.site-nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
}
.site-nav-link:hover { color: var(--ink); }
.site-nav-link.is-active {
  color: var(--ink);
  background: color-mix(in srgb, var(--accent) 22%, transparent);
}

.list-wrap, .article-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 4vw, 1.75rem) 3rem;
}
.list-wrap.narrow { max-width: 40rem; }
.list-head h1, .article-head h1 {
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 4vw, 2.1rem);
}
.lede { color: var(--muted); margin: 0 0 0.65rem; }
.article-byline { color: var(--muted); font-size: 0.9rem; margin: 0 0 1.25rem; }
.eyebrow { color: var(--accent); font-size: 0.78rem; margin: 0 0 0.35rem; letter-spacing: 0.04em; }
.crumb { font-size: 0.82rem; color: var(--muted); margin: 0 0 1rem; }
.crumb a { color: var(--accent); }
.muted { color: var(--muted); font-size: 0.85rem; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}

.author-card {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--surface);
  margin-bottom: 1.25rem;
  border-radius: 8px;
}
.author-card p { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.9rem; }
.author-card a { color: var(--accent); }

.filters {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}
@media (min-width: 640px) {
  .filters { grid-template-columns: 1fr minmax(10rem, 14rem); }
}
#col-search, #col-group {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  min-height: 44px;
}
#col-search:focus, #col-group:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 1px;
}

.col-card.is-hidden,
.group-section.is-hidden,
.featured-section.is-hidden {
  display: none !important;
}

.featured-section {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.featured-grid .col-card {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}

.section-label {
  font-family: var(--display);
  font-size: 1.15rem;
  margin: 1.5rem 0 0.65rem;
  letter-spacing: -0.02em;
}

.group-section {
  margin-bottom: 0.5rem;
}

.col-grid {
  display: grid;
  gap: 0.75rem;
}
.col-card {
  display: grid;
  gap: 0.25rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s ease;
}
.col-card:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); }
.col-group { font-size: 0.72rem; color: var(--accent); letter-spacing: 0.03em; }
.col-title { font-size: 1.02rem; }
.col-desc { font-size: 0.88rem; color: var(--muted); }
.col-tags { font-size: 0.75rem; color: var(--muted); opacity: 0.9; }

.tag-row { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.75rem; }
.tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.prose { font-size: 1.02rem; }
.prose h1, .prose h2, .prose h3 {
  font-family: var(--display);
  letter-spacing: -0.02em;
  margin: 1.6rem 0 0.6rem;
}
.prose p { margin: 0.75rem 0; }
.prose a { color: var(--accent); }
.prose img { max-width: 100%; height: auto; }
.prose pre, .prose code {
  font-family: ui-monospace, "IBM Plex Mono", monospace;
  font-size: 0.86em;
}
.prose pre {
  overflow: auto;
  padding: 0.85rem 1rem;
  background: #0a0e12;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.prose table {
  display: block;
  overflow-x: auto;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.prose th, .prose td {
  border: 1px solid var(--line);
  padding: 0.4rem 0.55rem;
}
.prose blockquote {
  margin: 1rem 0;
  padding-left: 0.9rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.author-box {
  margin-top: 2.5rem;
  padding: 1rem 1.1rem;
  border-top: 1px solid var(--line);
}
.author-box h2 { font-size: 0.95rem; margin: 0 0 0.5rem; }
.author-links a { color: var(--accent); }

.site-foot {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 4vw, 1.75rem) 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}
.site-foot a { color: var(--accent); }
.tech-links { line-height: 1.7; }
.source-note { margin-top: 2rem; }