:root {
  --ink: #1a1d21;
  --muted: #5a6470;
  --accent: #9b1c1c;
  --accent2: #14532d;
  --rule: #d8dde3;
  --bg: #fafbfc;
  --card: #ffffff;
  --warn-bg: #fef3c7;
  --warn-edge: #b45309;
  --fix-bg: #fee2e2;
  --fix-edge: #991b1b;
  --ok-bg: #dcfce7;
  --ok-edge: #166534;
  --code-bg: #eef1f4;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
header.site {
  background: #14181d;
  color: #e8e4d8;
  padding: 1.6rem 1rem 1.4rem;
  text-align: center;
}
header.site h1 {
  margin: 0;
  font-size: 1.9rem;
  letter-spacing: 0.04em;
}
header.site .sub {
  color: #9aa3ad;
  font-size: 0.95rem;
  margin-top: 0.35rem;
}
header.site .ver {
  display: inline-block;
  margin-top: 0.6rem;
  padding: 0.15rem 0.7rem;
  border: 1px solid #6b7280;
  border-radius: 1rem;
  font-size: 0.85rem;
  color: #d1d5db;
}
nav.toc {
  background: var(--card);
  border-bottom: 1px solid var(--rule);
  padding: 0.55rem 1rem;
  text-align: center;
  font-family: Verdana, sans-serif;
  font-size: 0.78rem;
}
nav.toc a { color: var(--accent); text-decoration: none; margin: 0 0.55rem; white-space: nowrap; }
nav.toc a:hover { text-decoration: underline; }
main {
  max-width: 60rem;
  margin: 0 auto;
  padding: 1.2rem 1rem 4rem;
}
h2 {
  font-size: 1.45rem;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 0.25rem;
  margin-top: 2.4rem;
}
h3 { font-size: 1.12rem; margin-top: 1.8rem; }
a { color: var(--accent); }
table {
  border-collapse: collapse;
  width: 100%;
  font-family: Verdana, sans-serif;
  font-size: 0.78rem;
  background: var(--card);
  margin: 0.8rem 0;
}
th, td {
  border: 1px solid var(--rule);
  padding: 0.4rem 0.55rem;
  text-align: left;
  vertical-align: top;
}
th { background: #eef1f4; }
tr:nth-child(even) td { background: #f6f8f9; }
code, .refdes {
  font-family: Consolas, 'Courier New', monospace;
  background: var(--code-bg);
  padding: 0.05rem 0.3rem;
  border-radius: 3px;
  font-size: 0.88em;
}
.callout {
  border-left: 5px solid;
  padding: 0.8rem 1rem;
  margin: 1.2rem 0;
  border-radius: 0 6px 6px 0;
}
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.warn { background: var(--warn-bg); border-color: var(--warn-edge); }
.fix  { background: var(--fix-bg);  border-color: var(--fix-edge); }
.ok   { background: var(--ok-bg);   border-color: var(--ok-edge); }
.callout .title {
  font-family: Verdana, sans-serif;
  font-weight: bold;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.4rem;
}
.imgrow { display: flex; gap: 1rem; flex-wrap: wrap; margin: 1rem 0; }
.imgrow figure { flex: 1 1 18rem; margin: 0; }
.imgrow img, figure img {
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
}
figcaption {
  font-family: Verdana, sans-serif;
  font-size: 0.74rem;
  color: var(--muted);
  margin-top: 0.3rem;
  text-align: center;
}
.schem { background: #fff; border: 1px solid var(--rule); border-radius: 6px; padding: 0.5rem; }
.schem img { width: 100%; border: none; }
ol.steps li, ul.tight li { margin-bottom: 0.5rem; }
.swgrid {
  font-family: Consolas, 'Courier New', monospace;
  background: #14181d;
  color: #e8e4d8;
  padding: 1rem 1.2rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.5;
  white-space: pre;
}
footer.site {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding: 1rem;
  text-align: center;
  font-family: Verdana, sans-serif;
  font-size: 0.75rem;
  color: var(--muted);
}
.dl { font-family: Verdana, sans-serif; font-size: 0.85rem; }
.dl li { margin-bottom: 0.35rem; }
.pill {
  display: inline-block;
  font-family: Verdana, sans-serif;
  font-size: 0.68rem;
  font-weight: bold;
  padding: 0.1rem 0.5rem;
  border-radius: 0.8rem;
  vertical-align: middle;
}
.pill.req { background: var(--fix-bg); color: var(--fix-edge); border: 1px solid var(--fix-edge); }
.pill.rec { background: var(--warn-bg); color: var(--warn-edge); border: 1px solid var(--warn-edge); }