/* Notes pages. Colour tokens, header and footer mirror index.html (brand.md D6);
   keep the two in step when either changes.

   Layout: a margin column carries the note's date, status, data files and section
   headings; the text column holds the argument at about 69 characters a line;
   figures and wide tables run past the text into the bleed column. */
:root {
  --bg: #FFFFFF;
  --fg: #17171A;
  --lede: #30313A;
  --muted: #5F606B;
  --rule: #E4E6EC;
  --rule-strong: #D8DBE2;
  --card: #F4F5F8;
  --link: #2F67D8;
  --link-hover: #173B84;
  --accent: #2F67D8;
  --proposed: #9A6100; /* task state `proposed` (#F2B35E), darkened to read as text on white */
  --sans: "Geist", ui-sans-serif, system-ui, sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --maxw: 1180px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0A0A0A;
    --fg: #EDEDF0;
    --lede: #C7C7CC;
    --muted: #9B9BA3;
    --rule: #1F1F25;
    --rule-strong: #26262B;
    --card: #17171A;
    --link: #8AB3FF;
    --link-hover: #C9DDFF;
    --accent: #6E9FFF;
    --proposed: #F2B35E;
  }
}
:root[data-theme="dark"] {
  --bg: #0A0A0A;
  --fg: #EDEDF0;
  --lede: #C7C7CC;
  --muted: #9B9BA3;
  --rule: #1F1F25;
  --rule-strong: #26262B;
  --card: #17171A;
  --link: #8AB3FF;
  --link-hover: #C9DDFF;
  --accent: #6E9FFF;
  --proposed: #F2B35E;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--link); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { color: var(--link-hover); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 2px; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 40px; }

/* ---------- header (as index.html) ---------- */
header {
  border-bottom: 1px solid var(--rule);
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
}
.bar { display: flex; align-items: center; gap: 16px; height: 76px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; margin-right: auto; color: var(--fg); }
.brand:hover { color: var(--fg); }
.brand svg { width: 30px; height: 30px; display: block; }
.brand b { font-weight: 500; letter-spacing: -.02em; font-size: 17px; white-space: nowrap; }
.brand b span { color: var(--muted); }
nav { display: flex; align-items: center; gap: 26px; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current] { color: var(--fg); }
.theme {
  display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px;
  border-radius: 8px; border: 1px solid var(--rule-strong); background: transparent; color: var(--muted);
  cursor: pointer; padding: 0; margin-left: 6px;
}
.theme[hidden] { display: none; }
.theme:hover { color: var(--fg); border-color: var(--muted); }
.theme svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.theme .sun { display: none; } .theme .moon { display: block; }
:root[data-theme="dark"] .theme .sun { display: block; } :root[data-theme="dark"] .theme .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .sun { display: block; }
  :root:not([data-theme="light"]) .theme .moon { display: none; }
}

/* ---------- the page grid ---------- */
main.wrap { padding-top: 88px; padding-bottom: 112px; }
.note, .index {
  display: grid;
  grid-template-columns: [rail] 10.5rem [text] minmax(0, 36em) [bleed] minmax(0, 1fr);
  column-gap: 56px;
  align-items: start;
}
.note > *, .index > * { grid-column: text; min-width: 0; }
.note > h1, .note > .wide, .note > .table { grid-column: text / -1; max-width: 50em; }

/* The margin column: date, status, files. Sentence case, one size, muted. */
.note > .rail { grid-column: rail; grid-row: 1 / span 3; }
.rail { font-size: 14px; line-height: 1.5; color: var(--muted); padding-top: 12px; }
.rail p { margin: 0 0 4px; }
.rail .files { list-style: none; padding: 0; margin: 24px 0 0; }
.rail .files li { margin: 0 0 4px; }
.rail .files li:first-child { color: var(--fg); margin-bottom: 6px; }
.rail .files a { color: var(--muted); }
.rail .files a:hover { color: var(--fg); }
.status { display: inline-flex; align-items: center; gap: 8px; color: var(--proposed); }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }

/* Under the title: author, dates, tags, as aligned label and value rows. */
.meta { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 2px 20px; margin: -4px 0 32px; font-size: 14px; line-height: 1.55; }
.meta div { display: contents; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; color: var(--fg); }
.meta .tag + .tag::before { content: ", "; }

/* ---------- type ---------- */
h1 {
  font-size: clamp(36px, 4.4vw, 54px); line-height: 1.06; letter-spacing: -.038em;
  font-weight: 600; margin: 0 0 26px; text-wrap: balance;
}
.summary { font-size: 21px; line-height: 1.5; color: var(--lede); margin: 0 0 56px; text-wrap: pretty; }
.note p { margin: 0 0 1.1em; text-wrap: pretty; }
/* Section headings sit in the margin, level with their first paragraph. */
.note > h2 {
  grid-column: rail;
  font-size: 17px; line-height: 1.35; font-weight: 600; letter-spacing: -.01em;
  margin: 40px 0 0; padding-top: 2px;
}
.note > h2 + * { margin-top: 40px; }
.note h3 { font-size: 17px; font-weight: 600; margin: 28px 0 8px; }
.note ul, .note ol { padding-left: 1.2em; margin: 0 0 1.1em; }
.note li { margin: 0 0 .45em; padding-left: .2em; }
.note li::marker { color: var(--muted); }
.note blockquote {
  margin: 0 0 1.4em; padding: 0 0 0 20px; border-left: 2px solid var(--rule-strong);
  color: var(--lede);
}
.note blockquote p { margin: 0 0 6px; }
.note blockquote p.by { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.note blockquote p.by:last-child { margin: 0; }
code { font-family: var(--mono); font-size: .86em; }
p code, li code { background: var(--card); border-radius: 4px; padding: 1px 5px; }
pre { background: var(--card); border-radius: 8px; padding: 14px 16px; overflow-x: auto; }
strong { font-weight: 600; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* ---------- tables: rules between rows, no box ---------- */
.table { overflow-x: auto; margin: 8px 0 2em; }
table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.45; font-variant-numeric: tabular-nums; }
th, td { padding: 9px 16px 9px 0; text-align: left; border-bottom: 1px solid var(--rule); white-space: nowrap; }
thead th { font-weight: 400; color: var(--muted); font-size: 14px; border-bottom-color: var(--rule-strong); vertical-align: bottom; }
th:last-child, td:last-child { padding-right: 0; }
tbody tr:last-child > * { border-bottom: 0; }

/* ---------- figures ---------- */
figure { margin: 12px 0 2.4em; }
figure .table { margin-bottom: 0; }
figcaption { font-size: 15px; line-height: 1.5; color: var(--muted); margin: 0 0 18px; max-width: 36em; }
figcaption strong { color: var(--fg); }

/* Strip: a reference share (tick) against the orchestrator's own share (dot), on one shared scale. */
.strip { --label: 11.5rem; --num: 4.5rem; }
.strip .head, .strip .row {
  display: grid; grid-template-columns: var(--label) minmax(0, 1fr) var(--num) var(--num) 3.5rem;
  column-gap: 16px; align-items: center;
}
.strip .head { font-size: 14px; color: var(--muted); padding-bottom: 8px; border-bottom: 1px solid var(--rule-strong); }
.strip .head > :nth-child(n+3), .strip .row > :nth-child(n+3) { text-align: right; }
.strip .axis { position: relative; height: 1.4em; }
.strip .axis span { position: absolute; left: calc(var(--x) * 1%); transform: translateX(-50%); }
.strip .axis span:first-child { transform: none; }
.strip .axis span:last-child { transform: translateX(-100%); }
.strip .row { border-bottom: 1px solid var(--rule); font-variant-numeric: tabular-nums; }
.strip .row:last-child { border-bottom: 0; }
.strip .who { display: flex; align-items: baseline; gap: 8px; white-space: nowrap; }
.strip .who small { color: var(--muted); font-size: 14px; }
.strip .track {
  position: relative; height: 52px;
  /* Hairline gridlines at the start, middle and end of the scale. */
  background:
    linear-gradient(var(--rule), var(--rule)) 0 0 / 1px 100% no-repeat,
    linear-gradient(var(--rule), var(--rule)) 50% 0 / 1px 100% no-repeat,
    linear-gradient(var(--rule), var(--rule)) 100% 0 / 1px 100% no-repeat;
}
.strip .track i { position: absolute; top: 50%; }
.strip .tick { left: calc(var(--exp) * 1%); width: 2px; height: 22px; margin: -11px 0 0 -1px; background: var(--muted); border-radius: 1px; }
.strip .gap {
  left: calc(min(var(--exp), var(--obs)) * 1%);
  width: calc((max(var(--exp), var(--obs)) - min(var(--exp), var(--obs))) * 1%);
  height: 2px; margin-top: -1px; background: var(--accent); opacity: .45;
}
.strip .dot {
  left: calc(var(--obs) * 1%); width: 12px; height: 12px; margin: -6px 0 0 -6px;
  border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 2px var(--bg);
}
.strip .key { display: flex; gap: 22px; font-size: 14px; color: var(--muted); margin: 0 0 12px; }
.strip .key span { display: inline-flex; align-items: center; gap: 8px; }
.strip .key .k-dot::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
.strip .key .k-tick::before { content: ""; width: 2px; height: 14px; border-radius: 1px; background: var(--muted); }

/* Heat table: tasks per crew, one hue, more is darker. Bold marks own provider. */
.heat table { width: auto; }
.heat th[scope="row"] { font-weight: 400; padding-right: 24px; }
.heat thead tr:first-child th { border-bottom: 0; padding-bottom: 2px; }
.heat thead th[colspan] { color: var(--fg); text-align: center; padding-right: 0; }
.heat thead tr + tr th { text-align: center; padding-right: 0; }
.heat td {
  text-align: center; min-width: 3.6rem; padding: 0; height: 40px;
  border-bottom: 2px solid var(--bg); border-right: 2px solid var(--bg);
}
.heat td.l1 { background: color-mix(in srgb, var(--accent) 14%, var(--bg)); }
.heat td.l2 { background: color-mix(in srgb, var(--accent) 28%, var(--bg)); }
.heat td.l3 { background: color-mix(in srgb, var(--accent) 42%, var(--bg)); }
.heat td.l4 { background: color-mix(in srgb, var(--accent) 56%, var(--bg)); }
.heat td strong { font-weight: 700; }

/* ---------- index ---------- */
.index > h1 { grid-column: text / -1; }
.index > .notes { grid-column: rail / -1; }
.notes { list-style: none; padding: 0; margin: 0; }
.notes li {
  display: grid; grid-template-columns: 10.5rem minmax(0, 36em); column-gap: 56px;
  border-top: 1px solid var(--rule-strong); padding: 26px 0 34px;
}
.notes .when { font-size: 14px; color: var(--muted); margin: 5px 0 0; }
.notes h2 { font-size: 24px; letter-spacing: -.02em; font-weight: 600; line-height: 1.25; margin: 0 0 10px; }
.notes h2 a { color: var(--fg); text-decoration: none; }
.notes h2 a:hover { color: var(--link); }
.notes li p { margin: 0; color: var(--muted); }
.notes li .status { color: var(--proposed); margin-top: 4px; }

/* ---------- footer (as index.html) ---------- */
footer { border-top: 1px solid var(--rule); }
footer .wrap {
  padding-top: 34px; padding-bottom: 56px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px;
  color: var(--muted); font-size: 14.5px;
}
footer a { color: var(--muted); }
footer .sp { margin-left: auto; display: flex; gap: 20px; }

/* ---------- narrower screens: one column, margin content moves inline ---------- */
@media (max-width: 1000px) {
  .note, .index { display: block; max-width: 36em; }
  .rail { display: flex; flex-wrap: wrap; gap: 4px 20px; padding: 0; margin: 0 0 22px; }
  .rail p { margin: 0; }
  .rail .files { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 0; flex-basis: 100%; }
  .rail .files li { margin: 0; }
  .rail .files li:first-child { margin: 0; }
  .note > h2 { font-size: 22px; letter-spacing: -.02em; margin: 52px 0 12px; padding: 0; }
  .note > h2 + * { margin-top: 0; }
  .notes li { display: block; }
  .notes .when { margin: 0 0 6px; }
}
@media (max-width: 560px) {
  .wrap { padding-left: 16px; padding-right: 16px; }
  .brand b { font-size: 15px; }
  .brand b span { display: none; }
  .brand svg { width: 26px; height: 26px; }
  .bar { height: 60px; }
  nav { gap: 14px; font-size: 14px; }
  nav .nav-orbit { display: none; }
  .theme { width: 44px; height: 44px; margin-left: 0; }
  main.wrap { padding-top: 44px; padding-bottom: 64px; }
  .summary { font-size: 18px; margin-bottom: 36px; }
  th, td { font-size: 14px; }
  /* Strip rows: name and numbers on one line, the track full width below. */
  .strip { --num: 4.6rem; }
  .strip .head, .strip .row { grid-template-columns: 1fr var(--num) var(--num) 2.8rem; column-gap: 8px; }
  .strip .head .axis { display: none; }
  .strip .row { padding-top: 12px; }
  .strip .row .track { grid-column: 1 / -1; grid-row: 2; height: 36px; }
  .strip .who small { display: none; }
  footer .sp { margin-left: 0; flex-wrap: wrap; }
}
@media (forced-colors: active) {
  .strip .tick, .strip .gap, .strip .dot, .strip .key span::before { forced-color-adjust: none; background: CanvasText; }
  .strip .dot, .strip .key .k-dot::before { background: Highlight; }
}