:root {
  --fg: #1a1a1a;
  --bg: #fdfdfd;
  --muted: #666;
  --accent: #0a4d8c;
  --rule: #ddd;
  --code-bg: #f4f4f4;
  --serif: Georgia, "Iowan Old Style", Charter, "Source Serif Pro", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Monaco, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e0e0e0;
    --bg: #1a1a1a;
    --muted: #999;
    --accent: #5ba3e0;
    --rule: #333;
    --code-bg: #252525;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 1rem; }
body { font: 16px/1.6 var(--serif); color: var(--fg); background: var(--bg); margin: 0; padding: 0; }
h1, h2, h3, h4, h5, h6 { font-family: var(--sans); line-height: 1.2; font-weight: 600; }

header { border-top: 2px solid var(--accent); border-bottom: 1px solid var(--rule); padding: 1.25rem 0; }
header > .wrap, nav > .wrap, footer > .wrap { max-width: 960px; margin: 0 auto; padding: 0 2rem; }
header h1 { margin: 0; font-size: 1.4rem; display: inline-block; }
header h1 a { color: var(--fg); text-decoration: none; }
header .ident { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); margin-left: 0.85rem; letter-spacing: 0.02em; }
header .tagline { color: var(--muted); font-size: 0.92rem; margin-top: 0.4rem; font-family: var(--sans); }

nav { padding: 0.65rem 0; border-bottom: 1px solid var(--rule); font-size: 0.9rem; font-family: var(--sans); }
nav a { color: var(--accent); text-decoration: none; margin-right: 1.25rem; }
nav a:hover { text-decoration: underline; }

main { padding: 2rem; max-width: 960px; margin: 0 auto; }
h2 { border-bottom: 1px solid var(--rule); padding-bottom: 0.3rem; margin-top: 2.25rem; font-size: 1.25rem; }
h3 { margin-top: 1.5rem; font-size: 1.05rem; }
p { margin: 0.85rem 0; }

a { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

.heading-anchor { color: var(--muted); text-decoration: none; margin-left: 0.4rem; opacity: 0; font-weight: normal; font-size: 0.85em; }
h2:hover .heading-anchor, h3:hover .heading-anchor,
h2:focus-within .heading-anchor, h3:focus-within .heading-anchor { opacity: 1; }
.heading-anchor:hover { color: var(--accent); }

code { font-family: var(--mono); background: var(--code-bg); padding: 0.1em 0.3em; border-radius: 3px; font-size: 0.88em; }
pre { font-family: var(--mono); background: var(--code-bg); padding: 1rem; border-radius: 4px; overflow-x: auto; font-size: 0.88em; }
pre code { background: none; padding: 0; font-size: 1em; }
blockquote { border-left: 3px solid var(--accent); padding: 0.25rem 1rem; margin: 0.75rem 0; color: var(--muted); }

.table-wrap { overflow-x: auto; margin: 1rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; font-family: var(--sans); }
th, td { border: 1px solid var(--rule); padding: 0.5rem 0.75rem; text-align: left; vertical-align: top; }
th { background: var(--code-bg); font-weight: 600; }

.mode-tag { display: inline-block; font-family: var(--mono); font-size: 0.72rem; padding: 0.15rem 0.55rem; border-radius: 3px; margin-right: 0.3rem; background: var(--code-bg); color: var(--fg); border-left: 3px solid var(--muted); }

.confidence-low, .confidence-medium, .confidence-high { font-family: var(--mono); font-size: 0.9em; }
.confidence-low { color: var(--muted); }
.confidence-medium { color: var(--fg); }
.confidence-high { color: var(--accent); font-weight: 600; }
.confidence-low::before { content: "\25CB\00A0"; color: var(--muted); }
.confidence-medium::before { content: "\25D0\00A0"; color: var(--fg); }
.confidence-high::before { content: "\25CF\00A0"; color: var(--accent); }

.pulse-list { list-style: none; padding: 0; margin: 0; }
.pulse-list li { border-bottom: 1px solid var(--rule); padding: 0.85rem 0; }
.pulse-list .meta { color: var(--muted); font-size: 0.85rem; font-family: var(--sans); }

.timeline-year { margin-top: 2.25rem; padding-bottom: 0.3rem; border-bottom: 1px solid var(--rule); font-size: 1.25rem; }
.timeline-month { margin: 1.5rem 0 0.5rem; color: var(--muted); font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }

.kv { display: grid; grid-template-columns: 12rem 1fr; gap: 0.5rem 1rem; margin: 1rem 0; font-family: var(--sans); }
.kv dt { color: var(--muted); font-size: 0.9rem; }
.kv dd { margin: 0; font-family: var(--mono); font-size: 0.88rem; word-break: break-all; }
@media (max-width: 30rem) {
  .kv { grid-template-columns: 1fr; gap: 0.15rem 0; }
  .kv dt { margin-top: 0.5rem; }
  .kv dt:first-of-type { margin-top: 0; }
}

.classification { scroll-margin-top: 1rem; padding: 0.75rem 0; border-bottom: 1px solid var(--rule); }
.classification:target { background: var(--code-bg); margin: 0 -0.75rem; padding-left: 0.75rem; padding-right: 0.75rem; border-radius: 3px; }

footer { padding: 2rem 0; color: var(--muted); font-size: 0.85rem; text-align: center; border-top: 1px solid var(--rule); border-bottom: 2px solid var(--accent); font-family: var(--sans); }

@media print {
  body { font-size: 11pt; color: #000; background: #fff; }
  nav, footer { display: none; }
  header { border-top: 1px solid #000; border-bottom: 1px solid #000; }
  a { color: #000; text-decoration: underline; }
  pre, code { background: #f7f7f7; }
  table, th, td { border-color: #000; }
  h2, h3 { page-break-after: avoid; }
  .pulse-list li, tr { page-break-inside: avoid; }
}