/* Palette and components follow the Scalable Systems Lab website (zavalab-site) */
:root {
  --red: #c5050c; --red-dark: #9b0000;
  --bg: #ffffff; --bg-soft: #f6f6f4; --card: #ffffff;
  --text: #1d1d1f; --muted: #5f6368; --border: #e3e3e0; --link: #b0050b;
  --shadow: 0 1px 2px rgb(0 0 0 / 6%), 0 4px 16px rgb(0 0 0 / 5%);
  --radius: 10px; --max: 1680px; --edge: #8a8a8a;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.55 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.site-header { background: var(--card); color: var(--red); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-top: 0.7rem; padding-bottom: 0.7rem; flex-wrap: wrap; }
.site-header .brand { font-weight: 700; font-size: 1.05rem; color: var(--red); }
.site-header nav { display: flex; gap: 0.4rem 1.2rem; flex-wrap: wrap; align-items: center; }
.site-header nav a { color: var(--red); font-size: 0.95rem; }
.lede { color: var(--muted); font-size: 1.05rem; max-width: 56rem; margin-top: 0; }
main h1 { margin: 1.4rem 0 0.4rem; font-size: 1.8rem; }
main h2 { margin: 2.4rem 0 0.6rem; font-size: 1.35rem; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem; box-shadow: var(--shadow); }
.btn { display: inline-block; padding: 0.4rem 0.9rem; border-radius: 8px; background: var(--red); color: #fff; font-weight: 600; border: 0; cursor: pointer; font: inherit; font-size: 0.9rem; }
.btn:hover { background: var(--red-dark); text-decoration: none; }
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { border-color: var(--red); }
.btn.secondary.active { border-color: var(--red); color: var(--red); font-weight: 700; }
input, select { font: inherit; color: var(--text); background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 0.3rem 0.5rem; }
input:focus-visible, select:focus-visible, button:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
.chip { display: inline-block; padding: 0.12rem 0.6rem; border-radius: 999px; border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); font-size: 0.8rem; cursor: pointer; font-family: inherit; margin: 0 0.2rem 0.3rem 0; }
.chip:hover { border-color: var(--red); }

/* Layout: controls | graph | details */
.net-wrap { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 1rem; align-items: start; }
.net-wrap.has-panel { grid-template-columns: 180px minmax(0, 1fr) 320px; }
.map-top { height: 0.8rem; scroll-margin-top: 0.5rem; }
.net-controls { display: flex; flex-direction: column; align-items: flex-start; gap: 0.8rem; padding-top: 0.4rem; font-size: 0.82rem; position: sticky; top: 0.5rem; }
.net-controls #find { width: 100%; font-size: 0.85rem; }
.net-controls select { font-size: 0.82rem; padding: 0.15rem 0.3rem; }
.net-controls .label { font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.groups { display: flex; flex-direction: column; gap: 0.25rem; }
.check { display: inline-flex; gap: 0.35rem; align-items: center; font-size: 0.82rem; }
.check input { accent-color: var(--red); margin: 0; }
.dot { display: inline-block; width: 0.75rem; height: 0.75rem; border-radius: 50%; flex: none; box-shadow: 0 0 0 1px rgb(0 0 0 / 15%); }
.seg { display: flex; gap: 0.25rem; flex-wrap: wrap; }
.seg .btn { padding: 0.12rem 0.55rem; font-size: 0.8rem; }
.zoom { display: flex; gap: 0.25rem; align-items: center; }
.zoom .btn { min-width: 1.8rem; padding: 0.1rem 0.45rem; font-size: 0.82rem; }

.graph-card { padding: 0.5rem; }
.ring-legend, .totals { width: fit-content; max-width: 100%; border: 1px solid #bdbdbd; border-radius: 1.4rem; padding: 0.4rem 1.2rem; }
.ring-legend { margin: 0.1rem auto 0.2rem; list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: 0.25rem 1.1rem; font-size: 0.85rem; }
.ring-legend li { display: flex; align-items: center; gap: 0.4rem; }
.totals { text-align: center; margin: 0.3rem auto 0.2rem; color: var(--muted); font-size: 0.92rem; }
.totals strong { color: var(--red); font-size: 1.15rem; }
.hint { text-align: center; font-size: 0.78rem; color: var(--muted); margin: 0.1rem 0 0.4rem; }

#graph { display: block; width: 100%; height: calc(100vh - 200px); min-height: 480px; user-select: none; }
#edges line, #edges path { fill: none; stroke: var(--edge); stroke-opacity: 0.35; transition: stroke-opacity 0.15s; }
#graph.focus #edges line, #graph.focus #edges path { stroke-opacity: 0.05; }
#graph.focus #edges .on { stroke: var(--red); stroke-opacity: 0.85; }
#graph.focus #edges .path { stroke: var(--red); stroke-opacity: 0.95; stroke-dasharray: 5 3; }
.node { cursor: pointer; transition: opacity 0.15s; outline: none; }
.node circle { stroke: var(--card); stroke-width: 1.5; }
.node.hub circle { stroke: var(--text); stroke-width: 2.2; }
.node text { fill: var(--text); font-family: Inter, system-ui, sans-serif; paint-order: stroke; stroke: var(--card); stroke-width: 3px; stroke-linejoin: round; pointer-events: none; }
.node text.minor { display: none; }
#graph.zoomed .node text.minor, #graph.focus .node.on text.minor { display: inline; }
#graph.focus .node:not(.on) { opacity: 0.15; }
.node.me circle, .node.selected circle, .node:focus-visible circle { stroke: var(--red); stroke-width: 3.5; }
#graph.chapter .node.off { opacity: 0.1; }
#graph.chapter #edges .off { stroke-opacity: 0.03; }
.node.new circle { stroke: var(--text); stroke-width: 2.4; }
#flow path { transition: stroke-opacity 0.15s; }
#flow path:hover { stroke-opacity: 0.9; }
.flow-ch:focus-visible circle { stroke-width: 4; }
.node.anc circle { stroke: var(--red); stroke-width: 2.5; stroke-dasharray: 3 2; }

/* Details panel */
#panel { max-height: calc(100vh - 80px); overflow: auto; font-size: 0.9rem; position: sticky; top: 0.5rem; }
#panel h3 { margin: 0 0 0.2rem; }
#panel h4 { margin: 1rem 0 0.35rem; font-size: 0.92rem; }
.kv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.4rem; margin: 0.6rem 0; }
.kv div { background: var(--bg-soft); border-radius: 8px; padding: 0.35rem 0.45rem; text-align: center; }
.kv b { display: block; color: var(--red); font-size: 1.1rem; }
.kv span { font-size: 0.72rem; color: var(--muted); }
.spark { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; align-items: end; height: 54px; margin: 0.2rem 0; }
.spark div { background: var(--red); border-radius: 2px 2px 0 0; min-height: 1px; }
.spark-l { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; font-size: 0.7rem; color: var(--muted); text-align: center; }
.plist { padding-left: 1.1rem; margin: 0.2rem 0; display: grid; gap: 0.15rem; }

/* Statistics section */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0.8rem; }
.stat { font-size: 1.9rem; font-weight: 700; line-height: 1.1; color: var(--red); }
.stat-label { color: var(--muted); font-size: 0.88rem; }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1rem; margin-top: 1rem; }
.bars { display: grid; gap: 0.28rem; font-size: 0.85rem; }
.bar-row { display: grid; grid-template-columns: 11.5rem 1fr 3rem; gap: 0.5rem; align-items: center; cursor: pointer; }
.bar-row:hover .name { color: var(--red); }
.bar-row .name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar-row .track { background: var(--bg-soft); border-radius: 4px; height: 0.8rem; }
.bar-row .fill { height: 100%; border-radius: 4px; }
.bar-row .val { text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); }
.card h3 { margin: 0 0 0.2rem; font-size: 1.05rem; }
.card .sub { margin: 0 0 0.7rem; font-size: 0.82rem; color: var(--muted); }

.heat-ctl { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; font-size: 0.85rem; margin-bottom: 0.6rem; }
.heat-wrap { overflow-x: auto; }
table.heat { border-collapse: separate; border-spacing: 2px; font-size: 0.8rem; min-width: 640px; }
table.heat th { font-weight: 600; color: var(--muted); padding: 0.2rem 0.3rem; text-align: center; vertical-align: bottom; }
table.heat th.ch { width: 5.2rem; font-size: 0.74rem; line-height: 1.2; }
table.heat td.name { white-space: nowrap; padding-right: 0.5rem; cursor: pointer; }
table.heat td.name:hover { color: var(--red); }
table.heat td.cell { width: 5.2rem; height: 1.3rem; text-align: center; border-radius: 3px; font-variant-numeric: tabular-nums; }
table.heat td.tot { text-align: right; color: var(--muted); padding-left: 0.5rem; font-variant-numeric: tabular-nums; }

.about { font-size: 0.92rem; max-width: 60rem; }
.about li { margin-bottom: 0.3rem; }
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 1.5rem 0; font-size: 0.85rem; color: var(--muted); margin-top: 3rem; }

#tip { position: fixed; pointer-events: none; z-index: 100; background: var(--card); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 0.4rem 0.6rem; font-size: 0.82rem; box-shadow: var(--shadow); max-width: 300px; display: none; }

@media (max-width: 980px) {
  .net-wrap, .net-wrap.has-panel { grid-template-columns: 1fr; }
  .net-controls { position: static; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem; }
  .net-controls #find { width: 190px; }
  .groups { flex-direction: row; flex-wrap: wrap; gap: 0.2rem 0.8rem; }
  #panel { max-height: none; position: static; }
  #graph { height: 60vh; }
  .bar-row { grid-template-columns: 9rem 1fr 2.6rem; }
}


/* Subpages */
.site-header nav a[aria-current="page"] { font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }
main.subpage { min-height: calc(100vh - 160px); }
main.subpage h1 { margin: 1.6rem 0 0.5rem; font-size: 1.6rem; }

.site-header nav a.ext { border: 1px solid var(--red); border-radius: 999px; padding: 0 0.7rem; }
.site-header nav a.ext:hover { background: var(--red); color: #fff; text-decoration: none; }

/* Chapters page */
.ch-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin-top: 1rem; }
.ch-card { cursor: pointer; transition: transform 0.12s, box-shadow 0.12s; }
.ch-card:hover { transform: translateY(-2px); box-shadow: 0 2px 4px rgb(0 0 0 / 8%), 0 8px 24px rgb(0 0 0 / 8%); }
.ch-card h3 { margin: 0.1rem 0 0.5rem; font-size: 1.05rem; }
.ch-num { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
.ch-stats { display: flex; flex-wrap: wrap; gap: 0.2rem 0.9rem; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.4rem; }
.ch-stats b { font-size: 1.05rem; }
.ch-sub { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); margin: 0.5rem 0 0.25rem; }
.ch-pill { display: inline-block; color: #fff; font-size: 0.75rem; font-weight: 600; border-radius: 999px; padding: 0.05rem 0.55rem; margin: 0 0.25rem 0.25rem 0; }
#flow .arc { transition: stroke-opacity 0.15s; }

/* Chapters page: diagram and cards fit in one screen */
#flow { padding: 0.4rem 0.6rem; }
#flow svg { height: min(34vh, 330px); width: 100%; }
.ch-cards { grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 0.6rem; margin-top: 0.6rem; }
.ch-card { padding: 0.55rem 0.7rem; font-size: 0.85rem; }
.ch-card h3 { font-size: 0.92rem; margin: 0 0 0.3rem; }
.ch-num { font-size: 0.7rem; }
.ch-stats { font-size: 0.78rem; gap: 0.1rem 0.6rem; margin-bottom: 0.1rem; }
.ch-stats b { font-size: 0.92rem; }
.ch-sub { margin: 0.3rem 0 0.15rem; font-size: 0.68rem; }
.ch-card .chip { font-size: 0.72rem; padding: 0.05rem 0.45rem; margin-bottom: 0.2rem; }
main.subpage h1 { margin: 0.9rem 0 0.3rem; }
main.subpage > .lede { font-size: 0.95rem; margin-bottom: 0.6rem; }
@media (min-width: 1000px) { .ch-cards { grid-template-columns: repeat(7, minmax(0, 1fr)); } }
@media (min-width: 1000px) and (max-width: 1299px) { .ch-card { padding: 0.5rem 0.5rem; } .ch-card h3 { font-size: 0.85rem; } .ch-stats { font-size: 0.72rem; } }

/* Topic Incidence: compact rows; long lists scroll inside the card so the page fits one screen */
.heat-ctl { margin-bottom: 0.4rem; font-size: 0.8rem; gap: 0.4rem 1rem; }
.heat-wrap { max-height: calc(100vh - 215px); overflow: auto; }
table.heat { width: 100%; min-width: 600px; border-spacing: 1px; font-size: 0.74rem; }
table.heat thead th { position: sticky; top: 0; background: var(--card); z-index: 1; padding: 0.15rem 0.2rem; }
table.heat th.ch { width: auto; font-size: 0.72rem; line-height: 1.15; }
table.heat th.ch .ch-t { font-weight: 400; font-size: 0.66rem; color: var(--muted); }
table.heat td.cell { width: auto; height: 1.05rem; line-height: 1.05rem; padding: 0; }
table.heat td.name { padding: 0 0.5rem 0 0; }
table.heat td.tot { padding: 0 0 0 0.4rem; }
/* Topic Incidence: fixed, narrower chapter columns (horizontal space can stay free) */
table.heat { width: auto; min-width: 0; }
table.heat th.ch, table.heat td.cell { width: 6.8rem; min-width: 6.8rem; max-width: 6.8rem; }
.about h2 { font-size: 1.1rem; margin: 1.4rem 0 0.4rem; }

/* ZavaLab Navigator header (same as the navigator's CollabTabs component) */
.nav-head .wrap { padding-top: 0.5rem; }
.collab-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1.5rem; margin: 0.2rem 0 0.3rem; }
.collab-head h1 { margin: 0; font-size: 1.6rem; }
.collab-head h1 a { color: inherit; text-decoration: none; }
.collab-head h1 a:hover { color: var(--red); }
.collab-head .tabs { display: inline-flex; flex-wrap: wrap; border: 1px solid #bdbdbd; border-radius: 999px; padding: 3px; gap: 2px; }
.collab-head .tabs a { padding: 0.35rem 1.1rem; border-radius: 999px; color: var(--text); font-weight: 600; font-size: 0.95rem; text-decoration: none; }
.collab-head .tabs a:hover { background: var(--bg-soft); }
.collab-head .tabs a[aria-current="page"] { background: var(--red); color: #fff; }
.collab-head .title-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.3rem 0.8rem; }
.collab-head .home-link { color: var(--red); font-weight: 600; font-size: 0.95rem; text-decoration: none; }
.collab-head .home-link:hover { text-decoration: underline; }
.site-header .wrap { padding-top: 0.35rem; padding-bottom: 0.45rem; }
/* The navigator header takes ~55px more; keep each page within one screen */
#graph { height: calc(100vh - 255px); }
.heat-wrap { max-height: calc(100vh - 270px); }
#flow svg { height: min(30vh, 300px); }
.book-note { border-left: 4px solid var(--red); background: var(--bg-soft); padding: 0.6rem 0.9rem; border-radius: 0 8px 8px 0; }

/* Phones: the navigator tabs become a single-line strip that scrolls sideways; the page menu wraps */
@media (max-width: 700px) {
  .nav-head .wrap { padding-top: 0.4rem; }
  .collab-head { gap: 0.35rem; margin-bottom: 0.2rem; }
  .collab-head h1 { font-size: 1.25rem; }
  .collab-head .home-link { font-size: 0.82rem; }
  .collab-head .tabs { flex-wrap: nowrap; overflow-x: auto; max-width: 100%; scrollbar-width: none; }
  .collab-head .tabs::-webkit-scrollbar { display: none; }
  .collab-head .tabs a { flex: none; white-space: nowrap; padding: 0.3rem 0.75rem; font-size: 0.85rem; }
  .site-header .wrap { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .site-header .brand { font-size: 0.9rem; }
  .site-header nav { gap: 0.3rem 1rem; }
  .site-header nav a { white-space: nowrap; font-size: 0.88rem; }
  #graph { height: 92vw; min-height: 320px; }
}

/* Same position and format of the top bar as the other ZavaLab Navigator pages:
   8px page margin, a 1400px column with 12px sides, title row 0.4rem from the top, no divider line */
body { padding: 8px; }
.wrap { max-width: 1400px; padding: 0 12px; }
.nav-head .wrap { padding-top: 0.4rem; }
.collab-head { margin: 0.2rem 0 0.4rem; }
.site-header { border-bottom: 0; }
.site-header .wrap { padding-top: 0; padding-bottom: 0.4rem; }