/* ==========================================================================
   MERIDIAN BOUNDARY INSTITUTE — TECHNICAL ARCHIVE SURFACE (shared)
   Light institutional field-report theme shared by the report, the technical
   note index, the individual technical notes, and the figure plate sheet.
   Palette, primitives, and rhythm are taken from the institute homepage
   (site/mbi/index.html), which is the visual source of truth.
   Paper ground, hairline rules, technical blue/black ink, sparse redline.
   No motion, no gradients, no glow.
   ========================================================================== */
:root {
  --paper: #f4f2ec;          /* page ground */
  --paper-card: #fbfaf6;     /* document cards */
  --paper-inset: #eeebe2;    /* inset panels, table headers */
  --ink: #191c1f;            /* primary text */
  --ink-soft: #3c434b;       /* body text */
  --ink-muted: #6a7078;      /* metadata, captions */
  --rule: #c9c4b6;           /* hairline rules */
  --rule-strong: #8f8a7c;    /* heavy rules */
  --blue: #1c4b82;           /* technical blue */
  --blue-soft: #5b7fa2;
  --redline: #a63a2b;        /* sparse accent: stamps, classification */
  --permit: #3f6f4e;         /* permitted / issued */
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --serif: "Iowan Old Style", "Palatino", "Charter", Georgia, "Times New Roman", serif;
  --sans: "Helvetica Neue", Helvetica, Arial, ui-sans-serif, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 15.5px;
  line-height: 1.58;
  overflow-x: hidden;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.page { width: min(1180px, calc(100% - 44px)); margin: 0 auto; position: relative; }

h1, h2, h3, h4 { color: var(--ink); font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0 0 14px; }
p:last-child { margin-bottom: 0; }

/* ---------- shared metadata primitives ---------- */
.field-label, .label, .kicker, .section-kicker, .eyebrow, .toc-title,
.plate-id, .note-code, .code, .num, .tag, .small {
  font-family: var(--mono);
}
.eyebrow { font-size: 10.5px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--blue); margin-bottom: 14px; }
.note-code, .code { font-size: 11.5px; letter-spacing: 0.06em; color: var(--blue); }
.accession { font-family: var(--mono); font-size: 11.5px; color: var(--blue); letter-spacing: 0.04em; }
.stamp {
  display: inline-block; font-family: var(--mono); font-size: 9.5px;
  letter-spacing: 0.12em; text-transform: uppercase; padding: 3px 8px;
  border: 1px solid currentColor; border-radius: 2px; white-space: nowrap;
}
.stamp.red { color: var(--redline); }
.stamp.blue { color: var(--blue); }
.stamp.grey { color: var(--ink-muted); }

/* ============ classification strip ============ */
.class-strip {
  background: var(--ink); color: #d8d4c8; font-family: var(--mono);
  font-size: 10px; letter-spacing: 0.13em; text-transform: uppercase; padding: 6px 0;
}
.class-strip .page { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.class-strip b { color: #fff; font-weight: 400; }

/* ============ compact masthead / topbar ============ */
.topbar, .top {
  display: flex; justify-content: space-between; align-items: center; gap: 24px;
  padding: 16px 0; font-family: var(--mono); color: var(--ink-muted);
  font-size: 10.5px; letter-spacing: 0.13em; text-transform: uppercase;
  border-bottom: 1px solid var(--rule); flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); min-width: 0; }
.brand:hover { text-decoration: none; opacity: .85; }
.brand > span:last-child { font-family: var(--serif); font-size: 15px; letter-spacing: -0.01em; text-transform: none; color: var(--ink); }
.mark, .brand img { width: 34px; height: 34px; flex: none; display: block; }
.mark img, .mark svg { width: 100%; height: 100%; display: block; }
.breadcrumb, .crumb { color: var(--ink-muted); }
.breadcrumb a, .crumb a { color: var(--ink-muted); }
.breadcrumb a:hover, .crumb a:hover { color: var(--blue); }
.status { display: flex; align-items: center; gap: 10px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--blue); }
.backlink, .route {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono);
  font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--blue);
}
.backlink { border: 1px solid var(--rule); border-radius: 2px; padding: 9px 14px; color: var(--ink-soft); }
.backlink:hover { border-color: var(--blue); color: var(--blue); text-decoration: none; }
.backlink .arrow, .route span { color: var(--blue); }
.route:hover, .node a:hover { text-decoration: none; color: var(--ink); }

/* ============ hero / front matter ============ */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: 0; border: 1px solid var(--rule); background: var(--paper-card); margin: 26px 0 0;
}
.hero > * { min-width: 0; }
.hero-copy { padding: 34px 38px 30px; border-right: 1px solid var(--rule); }
.hero h1 { font-size: clamp(27px, 3.4vw, 40px); line-height: 1.14; margin: 0 0 16px; }
.subtitle, .dek, .institute-line { font-size: 16.5px; color: var(--ink-soft); max-width: 60ch; margin: 0 0 16px; }
.institute-line { font-size: 15px; color: var(--ink-muted); }
.hero-copy .lede { margin-bottom: 0; }

/* hero side panels (report model-card, index record, plate meta) */
.model-card, .record, .hero-meta { padding: 26px 30px; background: var(--paper-inset); }
.model-head { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; margin-bottom: 10px; }
.model-title { font-family: var(--mono); letter-spacing: 0.13em; text-transform: uppercase; font-size: 10.5px; color: var(--ink-muted); }
.model-sub { color: var(--ink-soft); font-size: 13px; margin-top: 4px; font-family: var(--sans); }
.system-svg { width: 100%; height: auto; display: block; margin: 6px auto 0; border: 1px solid var(--rule); background: #fff; }
.caption-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 12px; }
.caption { border: 1px solid var(--rule); background: var(--paper-card); padding: 12px; }
.caption b { display: block; font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.1em; color: var(--blue); text-transform: uppercase; margin-bottom: 5px; }
.caption span { color: var(--ink-soft); font-size: 12px; font-family: var(--sans); }

.record h2 { font-family: var(--mono); font-weight: 400; letter-spacing: 0.13em; text-transform: uppercase; color: var(--ink-muted); font-size: 10px; margin: 0 0 14px; }
.record dl { margin: 0; }
.record div { padding: 10px 0; border-top: 1px solid var(--rule); }
.record div:first-child { border-top: 0; padding-top: 0; }
.record dt { font-family: var(--mono); font-size: 10px; letter-spacing: 0.11em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 3px; }
.record dd { margin: 0; color: var(--ink); font-size: 13.5px; font-family: var(--sans); }

.meta-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 22px; }
.hero-meta { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; align-content: start; }
.meta-card, .meta { border: 1px solid var(--rule); background: var(--paper-card); padding: 12px 14px; }
.meta-card .label, .meta b { display: block; font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 5px; }
.meta-card .value, .meta span { font-family: var(--mono); font-size: 12.5px; color: var(--ink); }

/* chips */
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 0; }
.pill { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.08em; text-transform: uppercase; border: 1px solid var(--blue); border-radius: 2px; color: var(--blue); padding: 6px 9px; background: transparent; white-space: nowrap; }

/* ============ shared quote / lede ============ */
.lede { font-size: 17px; color: var(--ink); }
.quote {
  margin: 16px 0; padding: 8px 0 8px 16px; border-left: 3px solid var(--blue);
  background: transparent; color: var(--ink); font-family: var(--serif);
  font-style: italic; font-size: 16.5px; line-height: 1.4;
}
.quote.reject { border-left-color: var(--redline); color: var(--redline); font-style: normal; font-size: 14.5px; font-family: var(--sans); }

/* ============ layout: sticky contents + body ============ */
.layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 30px; align-items: start; padding: 26px 0 60px; }
.layout > aside, aside.toc { position: sticky; top: 16px; border: 1px solid var(--rule); background: var(--paper-card); padding: 16px 14px; }
.toc-title { color: var(--blue); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 10px; }
.layout aside a, aside.toc a { display: block; color: var(--ink-soft); text-decoration: none; padding: 6px 8px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.03em; }
.layout aside a:hover, aside.toc a:hover { color: var(--blue); background: var(--paper-inset); text-decoration: none; }

/* ============ section cards (report + notes) ============ */
section { scroll-margin-top: 20px; }
.card, .section-card { border: 1px solid var(--rule); background: var(--paper-card); margin-bottom: 22px; }
.card-head, .section-header { padding: 18px 26px; border-bottom: 2px solid var(--ink); background: var(--paper-inset); }
.kicker, .section-kicker { color: var(--redline); font-size: 10px; letter-spacing: 0.13em; text-transform: uppercase; margin-bottom: 7px; }
.card-head h2, .section-header h2, .plate-head h2 { margin: 0; font-family: var(--serif); font-size: 20px; line-height: 1.18; font-weight: 600; }
.card-body, .section-body { padding: 22px 26px 24px; }
.card-body p, .section-body p, .plate p, .side p { color: var(--ink-soft); margin: 0 0 14px; }
.card-body h3 { font-family: var(--serif); font-size: 15px; color: var(--ink); margin: 18px 0 6px; }
.card-body h3:first-child { margin-top: 0; }
.card-body ol, .card-body ul, .section-body ol, .section-body ul { color: var(--ink-soft); margin: 0 0 14px; padding-left: 22px; font-family: var(--sans); font-size: 14px; }
.card-body li, .section-body li { margin-bottom: 6px; }

/* ============ section-head (index) ============ */
.section-head { display: flex; justify-content: space-between; gap: 18px; align-items: baseline; margin: 30px 0 16px; border-bottom: 2px solid var(--ink); padding-bottom: 10px; flex-wrap: wrap; }
.section-head h2 { margin: 0; font-family: var(--serif); font-size: 21px; }
.section-head p { margin: 0; color: var(--ink-muted); font-size: 13px; max-width: 48ch; font-family: var(--sans); }

/* ============ definition / term grids ============ */
.term-grid, .abstract-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.abstract-grid { grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr); }
.term { border: 1px solid var(--rule); background: var(--paper); padding: 15px 16px; }
.term b { display: block; font-family: var(--serif); color: var(--ink); font-size: 15px; margin-bottom: 5px; }
.term span { color: var(--ink-muted); font-size: 13.5px; font-family: var(--sans); }

/* ============ callout ============ */
.callout { border: 1px solid var(--rule-strong); background: var(--paper-inset); padding: 16px 18px; }
.callout .small { display: block; color: var(--redline); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 9px; }
.callout .big { font-family: var(--serif); color: var(--ink); font-size: 19px; line-height: 1.28; }
.callout p { margin: 0; color: var(--ink-soft); }

/* ============ timeline / steps (report) ============ */
.timeline { display: grid; gap: 12px; }
.step { display: grid; grid-template-columns: 68px minmax(0, 1fr); gap: 14px; align-items: start; }
.step-no { font-family: var(--mono); color: var(--blue); border: 1px solid var(--rule); background: var(--paper); padding: 8px 6px; text-align: center; font-size: 12px; }
.step-main { border: 1px solid var(--rule); background: var(--paper); padding: 13px 16px; }
.step-main b { display: block; color: var(--ink); margin-bottom: 4px; font-family: var(--serif); }
.step-main span { color: var(--ink-muted); font-size: 13.5px; font-family: var(--sans); }

/* ============ figure cards (report programme) ============ */
.figures { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.figure-card { border: 1px solid var(--rule); background: var(--paper); padding: 15px 16px; }
.figure-card .num { color: var(--blue); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 8px; }
.figure-card .name { color: var(--ink); font-family: var(--serif); font-weight: 600; line-height: 1.3; }
.figure-card .desc { color: var(--ink-muted); font-size: 13px; margin-top: 8px; font-family: var(--sans); }

/* ============ note list (report) ============ */
.note-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.note { border: 1px solid var(--rule); background: var(--paper); padding: 15px 16px; display: block; }
.note:hover { border-color: var(--blue); text-decoration: none; }
.note code { font-family: var(--mono); color: var(--blue); font-size: 11.5px; }
.note b { display: block; color: var(--ink); margin: 8px 0 6px; line-height: 1.28; font-family: var(--serif); }
.note span { color: var(--ink-muted); font-size: 13px; font-family: var(--sans); }

/* ============ node grid (index) ============ */
.node-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.node { border: 1px solid var(--rule); background: var(--paper-card); padding: 20px 22px; }
.node-top { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
.node .code { color: var(--blue); letter-spacing: 0.08em; }
.node .issued { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--permit); border: 1px solid var(--permit); padding: 4px 7px; border-radius: 2px; white-space: nowrap; }
.node h3 { font-family: var(--serif); font-size: 18px; line-height: 1.22; margin: 16px 0 9px; max-width: 32ch; }
.node p { margin: 0 0 16px; color: var(--ink-soft); font-size: 13.5px; font-family: var(--sans); }
.node a { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; }

/* ============ continuations (index status cards) ============ */
.continuations { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 14px; margin: 14px 0 40px; }
.status-card { border: 1px solid var(--rule); background: var(--paper-card); padding: 22px 24px; }
.status-card .label { display: block; color: var(--redline); margin-bottom: 12px; font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; }
.status-card h3 { margin: 0 0 8px; font-family: var(--serif); font-size: 17px; }
.status-card p { color: var(--ink-soft); font-size: 13.5px; margin: 0; font-family: var(--sans); }
.status-card .route { margin-top: 14px; }

/* ============ title block (note front matter) ============ */
.titleblock { border: 1px solid var(--rule); background: var(--paper-card); padding: 32px 36px; margin: 24px 0 26px; }
.titleblock h1 { font-family: var(--serif); font-size: clamp(24px, 3.2vw, 36px); line-height: 1.12; margin: 0 0 22px; }
.byline { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.byline .cell { border: 1px solid var(--rule); background: var(--paper); padding: 13px 14px; }
.byline .label { display: block; color: var(--ink-muted); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 6px; }
.byline .who { color: var(--ink); font-size: 14px; font-family: var(--serif); }
.byline .sub { color: var(--ink-muted); font-size: 12px; font-family: var(--sans); }

/* ============ claim / class / figure grids (notes) ============ */
.claims, .classes, .figgrid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.claims .col { border: 1px solid var(--rule); background: var(--paper); padding: 15px 18px; }
.claims .col.permit { border-left: 3px solid var(--permit); }
.claims .col.exclude { border-left: 3px solid var(--redline); }
.claims .col h4 { margin: 0 0 10px; font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; }
.claims .col.permit h4 { color: var(--permit); }
.claims .col.exclude h4 { color: var(--redline); }
.claims ul { margin: 0; padding-left: 18px; font-size: 13.5px; }

.cls { border: 1px solid var(--rule); background: var(--paper); padding: 15px 18px; }
.cls .tag { color: var(--blue); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 6px; }
.cls b { display: block; color: var(--ink); font-size: 14.5px; margin-bottom: 5px; font-family: var(--serif); }
.cls span { color: var(--ink-muted); font-size: 13px; font-family: var(--sans); }

.fig { border: 1px solid var(--rule); background: var(--paper); padding: 15px 18px; }
.fig .num { color: var(--blue); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 8px; }
.fig b { display: block; color: var(--ink); margin-bottom: 5px; font-family: var(--serif); }
.fig span { color: var(--ink-muted); font-size: 13px; font-family: var(--sans); }
.fig.todo { border-style: dashed; }
.fig.real { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.fig.real .fig-canvas { background: #fff; border-bottom: 1px solid var(--rule); padding: 12px; }
.fig.real .fig-canvas svg { width: 100%; height: auto; display: block; border: 1px solid var(--rule); }
.fig.real figcaption { padding: 14px 16px; }
.fig.real figcaption .num { display: block; color: var(--blue); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 8px; }
.fig.real figcaption b { display: block; color: var(--ink); margin-bottom: 5px; font-family: var(--serif); }
.fig.real figcaption .desc { color: var(--ink-muted); font-size: 13px; font-family: var(--sans); }

/* ============ figure plate sheet ============ */
.plate { margin: 26px 0; border: 1px solid var(--rule); background: var(--paper-card); }
.plate-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; padding: 22px 26px; border-bottom: 2px solid var(--ink); background: var(--paper-inset); flex-wrap: wrap; }
.plate-id { color: var(--blue); font-size: 10.5px; letter-spacing: 0.13em; text-transform: uppercase; margin-bottom: 8px; }
.plate-note { max-width: 44ch; color: var(--ink-muted); font-size: 13px; font-family: var(--sans); }
.plate-body { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 0; }
.canvas { padding: 24px; background: #fff; border-right: 1px solid var(--rule); }
.figure-svg { width: 100%; height: auto; display: block; border: 1px solid var(--rule); background: #fff; }
.side { padding: 24px 26px; }
.side h3 { color: var(--blue); font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.13em; text-transform: uppercase; margin: 0 0 14px; }
.key { display: grid; gap: 10px; margin: 16px 0; }
.key div { border: 1px solid var(--rule); background: var(--paper); padding: 12px; }
.key b { display: block; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink); margin-bottom: 4px; }
.key span { font-size: 13px; color: var(--ink-muted); font-family: var(--sans); }

/* ============ footer ============ */
.footer {
  margin-top: 20px; border-top: 3px double var(--rule-strong); padding: 20px 0 48px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-muted); display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 960px) {
  .hero, .plate-body, .abstract-grid { grid-template-columns: 1fr; }
  .hero-copy { border-right: 0; border-bottom: 1px solid var(--rule); }
  .canvas { border-right: 0; border-bottom: 1px solid var(--rule); }
  .layout { grid-template-columns: 1fr; }
  .layout > aside, aside.toc { position: static; display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px 14px; }
  .toc-title { grid-column: 1 / -1; }
  .term-grid, .figures, .continuations, .node-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .note-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  body { font-size: 15px; }
  .page { width: min(100% - 28px, 1180px); }
  .class-strip { font-size: 9px; letter-spacing: 0.08em; }
  .class-strip .page { flex-direction: column; gap: 2px; }
  .topbar, .top { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero-copy, .model-card, .record, .hero-meta, .titleblock { padding: 24px 20px; }
  .card-body, .section-body, .card-head, .section-header, .plate-head, .canvas, .side { padding: 20px; }
  .meta-grid, .caption-row, .term-grid, .abstract-grid, .figures, .note-grid,
  .node-grid, .continuations, .byline, .claims, .classes, .figgrid, .hero-meta { grid-template-columns: 1fr; }
  .layout > aside, aside.toc { grid-template-columns: 1fr; }
  .step { grid-template-columns: 52px minmax(0, 1fr); }
  .section-head { flex-direction: column; align-items: flex-start; }
  .footer { flex-direction: column; }
  .figure-svg, .system-svg, .fig.real .fig-canvas svg { min-width: 0; }
}