:root {
  --bg: #0f1115;
  --panel: #161922;
  --fg: #eaeaea;
  --muted: #888a92;
  --accent: #f4b400;
  --accent-fg: #0f1115;
  --border: #2a2e3a;
  --code: #1c2030;
  --mono: ui-monospace, "JetBrains Mono", Consolas, "SF Mono", monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 64px 24px 96px; }
h1 {
  font-size: 38px; line-height: 1.1; margin: 0 0 16px;
  letter-spacing: -0.02em; font-weight: 700;
}
h2 {
  font-size: 13px; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--muted); margin: 40px 0 12px; font-weight: 600;
}
p { margin: 0 0 12px; line-height: 1.6; }
strong { color: var(--fg); }
a { color: var(--muted); }
code {
  background: var(--code); padding: 1px 6px; border-radius: 3px;
  font-family: var(--mono); font-size: 13px; color: var(--fg);
}
pre {
  background: var(--code); border: 1px solid var(--border); border-radius: 6px;
  padding: 16px; font: 13px/1.6 var(--mono); color: var(--fg);
  overflow-x: auto; margin: 0 0 20px; white-space: pre-wrap; word-break: break-word;
}
pre code { background: none; padding: 0; border-radius: 0; font-size: inherit; }
ul { padding-left: 20px; margin: 0 0 14px; color: var(--muted); }
ul li { padding: 3px 0; }
blockquote {
  background: var(--panel); border: 1px solid var(--border); border-radius: 6px;
  padding: 14px 16px; margin: 0 0 20px; color: var(--muted); font-size: 15px;
}
blockquote p { margin: 0; }

/* Index page */
.hero-tag { color: var(--accent); font-family: var(--mono); font-size: 13px; margin-bottom: 12px; }
.tag { color: var(--accent); font-family: var(--mono); font-size: 14px; margin-bottom: 12px; }
.lede {
  font-size: 18px; color: var(--muted); margin: 16px 0 32px;
  max-width: 560px; line-height: 1.55;
}
.explainer p { color: var(--muted); max-width: 600px; }
.explainer strong { color: var(--fg); }
ul.bullets { list-style: none; padding: 0; margin: 8px 0 0; color: var(--muted); font-size: 15px; }
ul.bullets li { padding: 4px 0; }
.note { color: var(--muted); font-size: 13px; margin-top: 8px; }
.note summary { cursor: pointer; }
.section-note { color: var(--muted); font-size: 14px; margin-bottom: 4px; }

/* Hero tracks */
.hero-tracks {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 0 0 40px;
}
.track {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 20px;
}
.track-label {
  font-family: var(--mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--muted); margin-bottom: 12px;
}
.track-human p { color: var(--muted); font-size: 15px; line-height: 1.6; margin-bottom: 16px; }
.track-link {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  text-decoration: none; border-bottom: 1px solid transparent;
}
.track-link:hover { border-color: var(--accent); }
.track-agent .panel { margin-top: 0; }
.track-agent .panel pre { font-size: 12px; max-height: 240px; overflow-y: auto; }

/* What-is block */
.what-is {
  border-left: 2px solid var(--accent); padding-left: 16px;
  margin: 0 0 32px; color: var(--muted); font-size: 15px; line-height: 1.65;
}
.what-is strong { color: var(--fg); }

/* Architecture diagram */
.arch-diagram { margin: 0 0 40px; overflow-x: auto; }
.arch-diagram svg { width: 100%; max-width: 700px; height: auto; min-height: 50px; }

/* How it works steps */
.how-steps { margin: 0 0 32px; }
.step {
  display: grid; grid-template-columns: 28px 1fr; gap: 16px;
  padding: 16px 0; border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }
.step-num {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  font-weight: 700; padding-top: 2px;
}
.step-body strong { color: var(--fg); font-size: 15px; display: block; margin-bottom: 6px; }
.step-body p { color: var(--muted); font-size: 14px; margin: 0; line-height: 1.6; }

/* Terminal demo */
#demo { margin: 0 0 4px; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); max-height: 260px; }
.demo-caption { color: var(--muted); font-size: 13px; font-family: var(--mono); margin: 0 0 40px; }

/* Driver sections */
.driver { margin-bottom: 8px; }
.driver h3 { font-size: 14px; color: var(--fg); margin: 28px 0 4px; font-weight: 600; letter-spacing: 0; text-transform: none; }
.driver h3 a { color: var(--fg); text-decoration: none; }
.driver h3 a:hover { color: var(--accent); }
.driver-about { color: var(--muted); font-size: 14px; margin: 0 0 8px; max-width: 640px; line-height: 1.55; }
.driver-verbs { list-style: none; padding: 0; margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.driver-verbs li { padding: 3px 0; }

/* Trust strip */
.trust-strip {
  margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border);
  font-family: var(--mono); font-size: 12px; color: var(--muted);
  display: flex; flex-wrap: wrap; gap: 6px 0; align-items: center;
}
.trust-strip a { color: var(--muted); text-decoration: none; border-bottom: 1px dotted var(--muted); }
.trust-strip a:hover { color: var(--fg); border-color: var(--fg); }
.trust-sep { margin: 0 8px; }

@media (max-width: 600px) {
  .hero-tracks { grid-template-columns: 1fr; }
}

/* Panels (index copy buttons) */
.panel {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  color: var(--muted); font-family: var(--mono); font-size: 12px;
}
.panel pre {
  margin: 0; padding: 16px; background: var(--code); color: var(--fg);
  font: 14px/1.6 var(--mono); overflow-x: auto; white-space: pre-wrap; word-break: break-word;
  border: none; border-radius: 0;
}
.panel.prompt pre { color: #d8d8d8; }
button.copy {
  background: transparent; color: var(--muted);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 4px 10px; font: 12px var(--mono); cursor: pointer; transition: all 0.15s;
}
button.copy:hover { color: var(--accent-fg); background: var(--accent); border-color: var(--accent); }
button.copy.copied { color: var(--accent); border-color: var(--accent); }

/* Driver sections on home page */
.driver { margin-bottom: 8px; }
.driver h3 { font-size: 14px; color: var(--fg); margin: 28px 0 8px; font-weight: 600; letter-spacing: 0; text-transform: none; }
.driver-verbs { list-style: none; padding: 0; margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.driver-verbs li { padding: 3px 0; }

/* Workflow rows on home page */
.workflow-group { margin-bottom: 28px; }
.workflow-group h3 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin: 20px 0 8px; font-weight: 600; }
.workflow-row { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: baseline; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.workflow-row:last-child { border-bottom: none; }
.workflow-row a { color: var(--fg); text-decoration: none; font-family: var(--mono); font-size: 13px; }
.workflow-row a:hover { color: var(--accent); }
.workflow-row .desc { color: var(--muted); font-size: 13px; margin-top: 2px; }
.wf-status { font-family: var(--mono); font-size: 11px; white-space: nowrap; }
.wf-status.active { color: #5a9; }
.wf-status.revit  { color: var(--muted); }
.wf-status.preview { color: var(--accent); }

/* Preview banner (v0.1 scenario pages) */
.banner.v01 {
  background: var(--panel); border: 1px solid var(--accent);
  border-radius: 6px; padding: 12px 16px; margin-bottom: 32px;
  color: var(--muted); font-size: 14px; line-height: 1.5;
}
.banner.v01 code { font-size: 13px; }

/* Guide pages */
.label { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.tag-coming {
  display: inline-block; font-family: var(--mono); font-size: 11px;
  color: var(--accent); border: 1px solid var(--accent); border-radius: 3px;
  padding: 1px 6px; margin-left: 8px; vertical-align: middle;
}
.related { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); }
.related a {
  color: var(--muted); text-decoration: none; font-family: var(--mono);
  font-size: 13px; margin-right: 16px; border-bottom: 1px dotted var(--muted);
}
.related a:hover { color: var(--fg); }

/* Nav + footer */
nav {
  display: flex; align-items: center; gap: 24px;
  margin-bottom: 48px; padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
nav a { color: var(--muted); text-decoration: none; font-family: var(--mono); font-size: 13px; }
nav a:hover { color: var(--fg); }
nav a.nav-home { color: var(--accent); margin-right: 4px; }
nav a.active { color: var(--fg); }
footer {
  margin-top: 80px; padding-top: 24px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px; font-family: var(--mono);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
footer a { color: var(--muted); text-decoration: none; border-bottom: 1px dotted var(--muted); }
footer a:hover { color: var(--fg); border-color: var(--fg); }

@media (max-width: 600px) {
  h1 { font-size: 28px; }
  .lede { font-size: 16px; }
  .wrap { padding: 40px 18px 64px; }
}
.notice {
  border-left: 3px solid var(--border);
  background: var(--panel);
  padding: 16px 20px;
  margin: 16px 0 20px;
  border-radius: 0 4px 4px 0;
}
.notice p:last-child, .notice ul:last-child { margin-bottom: 0; }
.notice-warn { border-left-color: #d97706; }
.notice-warn strong { color: #fbbf24; }

/* Coverage matrix */
.cov-wrap {
  margin: 24px 0 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  font-family: var(--mono);
}
.cov-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
}
.cov-scroll { overflow-x: auto; }
.cov {
  width: 100%;
  border-collapse: collapse;
  font-size: 11.5px;
  font-family: var(--mono);
  white-space: nowrap;
}
.cov thead tr { border-bottom: 1px solid var(--border); }
.cov th {
  padding: 6px 8px;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
  text-align: center;
  border-left: 1px solid var(--border);
}
.cov th:first-child { text-align: left; border-left: none; min-width: 130px; }
.cov th.cov-rh-new { color: var(--accent); }
.cov td {
  padding: 6px 8px;
  border-bottom: 1px dotted var(--border);
  border-left: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
}
.cov td:first-child {
  text-align: left;
  border-left: none;
  color: var(--fg);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 10.5px;
}
.cov tr:last-child td { border-bottom: none; }
/* status colours */
.cov-full { color: var(--fg); }
.cov-add  { color: #5a9; }
.cov-key  { color: var(--muted); opacity: 0.7; }
.cov-nil  { color: var(--border); }
/* new-region column tint */
.cov td.cov-new { background: rgba(244,180,0,0.04); }
.cov th.cov-rh-new { background: rgba(244,180,0,0.06); }
/* tooltip cursor */
.cov td[title] { cursor: default; }
/* legend */
.cov-legend {
  display: flex;
  gap: 16px;
  padding: 7px 12px;
  border-top: 1px solid var(--border);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  flex-wrap: wrap;
}
.cov-legend .cov-full { color: var(--fg); }
.cov-legend .cov-add  { color: #5a9; }
.cov-legend .cov-new-l { color: var(--accent); }