:root {
  --bg: #ffffff; --fg: #1a1d24; --muted: #5b6472; --line: #e4e8ee;
  --card: #f7f9fc; --accent: #3b5bdb; --accent-soft: #edf1ff;
  --self: #2f9e6b; --world: #2f6fdb; --reasoning: #b7791f; --action: #c2410c;
  --maxw: 860px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218; --fg: #e6e9ef; --muted: #9aa4b2; --line: #232a35;
    --card: #161b24; --accent: #7c93ff; --accent-soft: #1b2340;
    --self: #4ade80; --world: #60a5fa; --reasoning: #fbbf24; --action: #fb923c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}
.wrap, .site-header, .site-footer { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: var(--card); padding: .1em .4em; border-radius: 5px; font-size: .9em; }
pre { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; overflow-x: auto; }
pre code { background: none; padding: 0; }

.site-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap;
}
.brand { font-size: 1.15rem; color: var(--fg); }
.site-header nav { display: flex; gap: 18px; }
.site-header nav a { color: var(--muted); font-weight: 500; }
.site-header nav a:hover { color: var(--accent); text-decoration: none; }

main.wrap { padding-top: 12px; padding-bottom: 48px; }
h1 { font-size: 2rem; line-height: 1.2; margin: .2em 0 .4em; }
h2 { margin-top: 1.8em; border-top: 1px solid var(--line); padding-top: 1.1em; }
.lede { font-size: 1.2rem; color: var(--muted); }

table { border-collapse: collapse; width: 100%; margin: 1em 0; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 8px 11px; text-align: left; vertical-align: top; }
th { background: var(--card); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 1.4em 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.card h3 { margin: 0 0 .3em; font-size: 1.05rem; }
.card .q { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; font-weight: 700; }
.q-self { color: var(--self); } .q-world { color: var(--world); }
.q-reasoning { color: var(--reasoning); } .q-action { color: var(--action); }
.card p { margin: .35em 0 0; color: var(--muted); font-size: .95rem; }
.card .folders { margin-top: .5em; font-size: .82rem; }

.diagram { margin: 1.6em 0; }
.diagram svg { width: 100%; height: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }

.ladder { list-style: none; padding: 0; margin: 1.2em 0; display: grid; gap: 6px; }
.ladder li { display: grid; grid-template-columns: 2.2em 1fr; align-items: baseline; gap: 10px;
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 7px 12px; }
.ladder .lvl { font-weight: 800; color: var(--accent); text-align: center; }
.ladder .nm { font-weight: 600; }
.ladder .ev { color: var(--muted); font-size: .92rem; }

.placeholder { text-align: center; padding: 56px 20px; border: 1px dashed var(--line);
  border-radius: 14px; background: var(--card); margin: 1.6em 0; }
.placeholder .big { font-size: 2.4rem; }
.badge { display: inline-block; font-size: .72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .05em; background: var(--accent-soft); color: var(--accent);
  padding: 3px 9px; border-radius: 999px; }

.doclist { list-style: none; padding: 0; }
.doclist li { border-bottom: 1px solid var(--line); padding: 11px 2px; }
.doclist a { font-weight: 600; font-size: 1.05rem; }
.doc-back { font-size: .9rem; }
.doc h1 { border: 0; }

.site-footer { border-top: 1px solid var(--line); padding-top: 18px; padding-bottom: 30px;
  color: var(--muted); font-size: .85rem; display: flex; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; }