:root {
  --bg: #0f1419;
  --bg-elev: #1a222c;
  --bg-card: #1e2833;
  --border: #2d3a47;
  --text: #e7ecf1;
  --muted: #9aa8b5;
  --accent: #0af;
  --accent-dim: rgba(0, 170, 255, 0.12);
  --warn: #f0a030;
  --ok: #3ecf8e;
  --danger: #e85d5d;
  --purple: #a78bfa;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", "Fira Code", Consolas, monospace;
  --radius: 10px;
  --max: 54rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16.5px;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 170, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 170, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}
.top {
  position: sticky; top: 0; z-index: 30;
  background: rgba(15, 20, 25, 0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.top-inner {
  position: relative; z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex; flex-wrap: wrap; gap: 0.65rem 1.1rem;
  align-items: center; justify-content: space-between;
  font-size: 0.9rem;
}
.brand {
  font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: -0.01em;
}
.brand span { color: var(--muted); font-weight: 500; }
.top nav { display: flex; flex-wrap: wrap; gap: 0.5rem 0.95rem; align-items: center; }
.top a { color: var(--accent); text-decoration: none; font-weight: 600; }
.top a:hover { text-decoration: underline; }
.btn-print {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  border-radius: 8px;
  padding: 0.35rem 0.7rem;
  font: inherit; font-weight: 600; cursor: pointer;
  color: var(--text);
}
.btn-print:hover {
  border-color: rgba(0, 170, 255, 0.45);
  color: var(--accent);
  background: var(--accent-dim);
}
.wrap {
  position: relative; z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}
.eyebrow {
  display: inline-block;
  font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(0, 170, 255, 0.25);
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  margin: 0 0 0.85rem;
}
.doc-meta {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem;
  font-size: 0.88rem; color: var(--muted);
  margin: 0 0 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.doc-meta strong { color: var(--text); font-weight: 600; }
.doc-meta code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--bg-elev); border: 1px solid var(--border);
  padding: 0.1em 0.35em; border-radius: 4px;
}
article h1 {
  font-size: clamp(1.85rem, 4vw, 2.45rem);
  line-height: 1.2; font-weight: 750;
  margin: 0 0 0.75rem; letter-spacing: -0.02em;
}
article h2 {
  font-size: 1.4rem; margin: 2rem 0 0.85rem;
  padding-bottom: 0.5rem; border-bottom: 1px solid var(--border);
  letter-spacing: -0.015em;
}
article h3 { font-size: 1.05rem; margin: 1.35rem 0 0.5rem; color: var(--text); }
article h4 { font-size: 0.98rem; margin: 1.15rem 0 0.4rem; color: var(--muted); }
article p { margin: 0 0 0.9rem; }
article ul, article ol { margin: 0 0 0.9rem; padding-left: 1.35rem; }
article li { margin: 0.3rem 0; }
article li::marker { color: var(--accent); }
article ul.task-list { list-style: none; padding-left: 0.15rem; }
article li.task { display: flex; gap: 0.5rem; align-items: flex-start; }
article li.task::marker { content: none; }
article li.task input { margin-top: 0.35rem; accent-color: var(--accent); }
a { color: var(--accent); }
code, .mono { font-family: var(--mono); font-size: 0.86em; }
code {
  background: var(--bg-elev); border: 1px solid var(--border);
  padding: 0.1em 0.35em; border-radius: 4px;
}
pre {
  background: #0a0e12; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.9rem 1.05rem;
  overflow-x: auto; font-family: var(--mono); font-size: 0.78rem;
  line-height: 1.5; margin: 0 0 1rem; color: #c5d0da;
}
pre code { background: none; border: 0; padding: 0; color: inherit; }
table {
  width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 0 0 1rem;
}
th, td {
  text-align: left; padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border); vertical-align: top;
}
th {
  color: var(--muted); font-weight: 650; font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.04em;
}
tr:hover td { background: rgba(255, 255, 255, 0.02); }
blockquote {
  margin: 0 0 1rem; padding: 0.55rem 0 0.55rem 1rem;
  border-left: 3px solid var(--accent); color: var(--muted);
}
blockquote strong { color: var(--text); }
hr { border: 0; border-top: 1px solid var(--border); margin: 1.8rem 0; }
.footer-note {
  margin-top: 2.5rem; padding-top: 1.35rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem; color: var(--muted);
}
/* Index */
.hero-block { margin-bottom: 1.75rem; }
.hero-block .lede { color: var(--muted); max-width: 42rem; margin: 0.5rem 0 1rem; }
.cards { display: grid; gap: 0.85rem; }
@media (min-width: 720px) { .cards { grid-template-columns: 1fr 1fr; } }
a.card-link {
  display: block; text-decoration: none; color: inherit;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.05rem 1.2rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
a.card-link:hover {
  border-color: rgba(0, 170, 255, 0.4);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}
a.card-link h3 {
  margin: 0 0 0.35rem; font-size: 1.02rem; color: var(--accent);
}
a.card-link p { margin: 0; font-size: 0.9rem; color: var(--muted); }
a.card-link .path {
  font-family: var(--mono); font-size: 0.75rem;
  color: var(--muted); margin-top: 0.55rem; opacity: 0.9;
}
.section-label {
  margin: 1.75rem 0 0.65rem; font-size: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted); font-weight: 700;
}
@media print {
  body::before { display: none; }
  .top { position: static; backdrop-filter: none; }
  .btn-print, .no-print { display: none !important; }
  .wrap { max-width: none; padding: 0.5rem 0 1.5rem; }
  .footer-note { display: none; }
  a { color: inherit; }
  h2, h3 { break-after: avoid; }
  table, pre, blockquote, a.card-link { break-inside: avoid; }
  pre { white-space: pre-wrap; }
}