/* ===========================================================================
   H Heuristics Digital Reports — report stylesheet.

   The house look for a digital report: a dark masthead over a warm paper
   body, Newsreader for display and Inter for text, a gold rule marking every
   structural break, and data presented in bordered cards rather than floated
   images. One report per page; every report shares this file, so a change
   here restyles the whole series.
   =========================================================================== */

:root {
  --bg: #fafaf8;
  --bg-card: #ffffff;
  --bg-accent: #f0ede6;
  --bg-dark: #1a1f2b;
  --bg-dark-2: #232937;

  --text: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #757575;
  --text-inverse: #f0ede6;

  --primary: #1a2744;
  --primary-light: #2c3e6b;
  --accent: #8b6914;
  --accent-light: #c8a951;

  --border: #d9d5cc;
  --border-light: #e8e4db;
  --rule: #c4bfb4;

  --chart-blue: #2c5282;
  --chart-blue-light: #63b3ed;
  --chart-gold: #b8860b;
  --chart-red: #9b2c2c;
  --chart-teal: #276749;
  --chart-gray: #718096;
  --chart-orange: #c05621;
  --chart-purple: #553c9a;

  --serif: Newsreader, Georgia, "Times New Roman", serif;
  --sans: Inter, -apple-system, BlinkMacSystemFont, "system-ui", "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --radius: 2px;
  --max-width: 960px;
  --gutter: 2rem;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--primary-light); text-decoration-thickness: 1px; text-underline-offset: 0.16em; }
a:hover { color: var(--accent); }

img { max-width: 100%; height: auto; }

::selection { background: rgba(200, 169, 81, 0.28); }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--accent); color: #fff; padding: 0.6rem 1rem;
  font-size: 0.8rem; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* --- reading progress ---------------------------------------------------- */

.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 100%;
  z-index: 300; background: transparent; pointer-events: none;
}
.progress__bar {
  height: 100%; width: 0;
  background: var(--accent-light);
  transition: width 90ms linear;
}

/* --- site bar (links back to the platform) -------------------------------- */

.sitebar {
  background: var(--bg-dark-2);
  border-bottom: 1px solid rgba(240, 237, 230, 0.08);
  padding: 0 var(--gutter);
}
.sitebar__inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 44px;
  font-family: var(--mono); font-size: 0.68rem;
  letter-spacing: 0.12em; text-transform: uppercase;
}
.sitebar a { color: rgba(240, 237, 230, 0.72); text-decoration: none; }
.sitebar a:hover { color: var(--accent-light); }
.sitebar__brand { color: var(--text-inverse) !important; font-weight: 600; }
.sitebar__brand span { color: var(--accent-light); }
.sitebar a.is-current { color: var(--accent-light); }
.sitebar__links { display: flex; gap: 1.4rem; }

/* --- masthead ------------------------------------------------------------- */

.masthead {
  background: var(--bg-dark);
  color: var(--text-inverse);
  padding: 3rem var(--gutter) 3rem;
  border-bottom: 4px solid var(--accent);
}
.masthead-inner { max-width: var(--max-width); margin: 0 auto; }

.masthead .overline {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 1.2rem;
}
.masthead h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  max-width: 900px;
  margin: 0 0 0.8rem;
}
.masthead .subtitle {
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 300;
  color: rgba(240, 237, 230, 0.75);
  max-width: 700px;
  line-height: 1.5;
  margin: 0;
}
.masthead .strapline {
  margin: 1.4rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  font-family: var(--serif);
  font-style: italic;
  font-size: 1rem;
  color: rgba(240, 237, 230, 0.62);
  max-width: 660px;
}
.masthead .meta-row {
  display: flex; flex-wrap: wrap;
  gap: 1.25rem 3rem;
  margin-top: 2rem; padding-top: 1.5rem;
  border-top: 1px solid rgba(240, 237, 230, 0.18);
  font-size: 0.8rem;
  color: rgba(240, 237, 230, 0.6);
}
.masthead .meta-row div { min-width: 0; }
.masthead .meta-row strong {
  display: block;
  color: var(--accent-light);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}

/* --- sticky section nav --------------------------------------------------- */

.sticky-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(26, 31, 43, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(240, 237, 230, 0.1);
  padding: 0 var(--gutter);
}
.nav-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; gap: 1.6rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }
.nav-inner a {
  flex: none;
  padding: 0.85rem 0;
  font-size: 0.82rem;
  color: rgba(240, 237, 230, 0.62);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 120ms ease, border-color 120ms ease;
}
.nav-inner a:hover { color: var(--text-inverse); }
.nav-inner a.is-active {
  color: var(--accent-light);
  border-bottom-color: var(--accent);
}

/* --- body ----------------------------------------------------------------- */

.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem var(--gutter) 4rem;
}

.content p { margin: 0 0 1.1rem; max-width: 74ch; }
.content > section > p,
.content > section > ul { color: var(--text-secondary); }

section { scroll-margin-top: 64px; }

section > h2 {
  font-family: var(--serif);
  font-size: clamp(1.55rem, 3.4vw, 1.9rem);
  font-weight: 600;
  color: var(--primary);
  line-height: 1.2;
  margin: 0 0 0.3rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent);
}
section > .section-dek {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 680px;
  font-style: italic;
}
section > h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--primary-light);
  margin: 2.2rem 0 0.8rem;
}
section > h4 {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
  margin: 1.6rem 0 0.5rem;
}

.section-rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 3rem 0 3.5rem;
}

.content ul, .content ol { max-width: 74ch; padding-left: 1.15rem; margin: 0 0 1.3rem; }
.content li { margin-bottom: 0.5rem; color: var(--text-secondary); }
.content li::marker { color: var(--accent); }

.content strong { color: var(--text); font-weight: 600; }

/* --- executive summary cards ---------------------------------------------- */

.exec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  margin: 2rem 0;
}
.exec-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 1.5rem;
}
.exec-card .exec-num {
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.exec-card .exec-title { font-weight: 600; margin: 0.4rem 0 0.5rem; font-size: 1rem; }
.exec-card .exec-body { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55; margin: 0; }

/* --- statistic cards ------------------------------------------------------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}
.stat-card {
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  padding: 1.3rem 1.3rem 1.1rem;
}
.stat-card .stat-value {
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
}
.stat-card .stat-label { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.35rem; line-height: 1.4; }
.stat-card .stat-source { font-size: 0.65rem; color: var(--text-muted); margin-top: 0.5rem; font-style: italic; }
.stat-card .stat-source a { color: inherit; }

/* --- charts ---------------------------------------------------------------- */

.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 1.3rem;
  margin: 1.8rem 0;
  position: relative;
}
.chart-container .chart-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}
.chart-frame { position: relative; height: 340px; }
.chart-frame--tall { height: 420px; }
.chart-frame--short { height: 280px; }
.chart-container canvas { max-height: 100%; }
.chart-container .chart-caption {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
  margin: 0.8rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border-light);
}
.chart-container .chart-caption a { color: var(--text-muted); }
.chart-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin: 1.8rem 0;
}
.chart-pair .chart-container { margin: 0; }

/* --- schematic (hand-drawn SVG diagrams) ----------------------------------- */

/* A schematic's labels are sized for its viewBox, so letting it shrink to a
   phone's width renders them at four or five pixels. It scrolls inside its own
   container below the min-width instead, the same way a wide table does. */
.schematic-wrap { overflow-x: auto; }
.schematic { width: 100%; min-width: 620px; height: auto; display: block; }
.schematic text { font-family: var(--sans); }

@media print {
  .schematic-wrap { overflow: visible; }
  .schematic { min-width: 0; }
}

/* --- the coverage matrix ---------------------------------------------------- */

.matrix { width: 100%; border-collapse: collapse; font-size: 0.8rem; }
.matrix th, .matrix td {
  border: 1px solid var(--border-light);
  padding: 0.5rem 0.55rem;
  text-align: center;
  vertical-align: middle;
}
.matrix thead th {
  background: var(--bg-dark);
  color: var(--text-inverse);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 500;
  line-height: 1.3;
}
.matrix tbody th {
  text-align: left;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-card);
  font-size: 0.78rem;
  min-width: 9.5rem;
}
.matrix td { font-weight: 600; color: #fff; font-size: 0.72rem; letter-spacing: 0.02em; }
.matrix .lv0 { background: #f4f2ec; color: var(--text-muted); }
.matrix .lv1 { background: #cfe0e6; color: var(--text); }
.matrix .lv2 { background: #5b91a8; }
.matrix .lv3 { background: #1f4e63; }
.matrix tbody tr:hover th { background: var(--bg-accent); }

.matrix-key {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem;
  margin-top: 0.9rem;
  font-size: 0.72rem; color: var(--text-muted);
}
.matrix-key span { display: inline-flex; align-items: center; gap: 0.4rem; }
.matrix-key i {
  width: 0.85rem; height: 0.85rem; display: inline-block;
  border: 1px solid var(--border);
}

/* --- data tables ------------------------------------------------------------ */

.tbl-scroll { overflow-x: auto; margin: 1.8rem 0; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  margin: 0;
}
.data-table thead { background: var(--bg-dark); color: var(--text-inverse); }
.data-table thead th {
  padding: 0.65rem 0.8rem;
  text-align: left;
  font-weight: 500;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.data-table tbody th {
  padding: 0.55rem 0.8rem;
  text-align: left;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border-light);
}
.data-table tbody td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}
.data-table tbody tr:nth-child(even) { background: rgba(0, 0, 0, 0.016); }
.data-table tbody tr:hover { background: rgba(200, 169, 81, 0.06); }
.data-table .num {
  text-align: right;
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: nowrap;
}
.table-caption {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 1.8rem 0 0.6rem;
}
.table-note { font-size: 0.75rem; color: var(--text-muted); font-style: italic; margin: 0.6rem 0 0; }

/* --- callouts and quotes ----------------------------------------------------- */

.callout {
  background: var(--bg-accent);
  border-left: 4px solid var(--primary);
  padding: 1.3rem 1.4rem;
  margin: 2rem 0;
  font-size: 0.9rem;
}
.callout p { margin: 0 0 0.7rem; max-width: none; }
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--primary); }
.callout .callout-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.callout--warn { border-left-color: var(--chart-red); }
.callout--warn .callout-title { color: var(--chart-red); }

.pull-quote {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 500;
  font-style: italic;
  color: var(--primary-light);
  line-height: 1.45;
  padding: 1.2rem 1.5rem;
  margin: 2rem 0;
  border-left: 4px solid var(--accent);
  background: var(--bg-accent);
}
.pull-quote .attribution {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.8rem;
  font-style: normal;
  color: var(--text-muted);
  font-family: var(--sans);
}

/* --- abstract ----------------------------------------------------------------- */

.abstract {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--primary);
  padding: 1.6rem 1.7rem 1.3rem;
}
.abstract h2 {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.9rem;
  padding: 0;
  border: 0;
}
.abstract p {
  font-size: 0.92rem;
  line-height: 1.68;
  color: var(--text-secondary);
  margin: 0 0 0.9rem;
  max-width: 76ch;
}
.abstract p:last-child { margin-bottom: 0; }

/* --- end matter ---------------------------------------------------------------- */

.endmatter h2 {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--rule);
}
.endmatter__list { margin: 0; }
.endmatter__list > div {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 0.5rem 1.5rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border-light);
}
.endmatter__list > div:last-child { border-bottom: 0; }
.endmatter dt {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-top: 0.15rem;
}
.endmatter dd {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  overflow-wrap: anywhere;
}
.endmatter .kw {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-accent);
  border: 1px solid var(--border-light);
  padding: 0.1rem 0.45rem;
  margin: 0 0.3rem 0.3rem 0;
}
.endmatter .cite-inline { font-family: var(--mono); font-size: 0.76rem; line-height: 1.65; }

@media (max-width: 620px) {
  .endmatter__list > div { grid-template-columns: 1fr; gap: 0.25rem; }
}

/* --- references -------------------------------------------------------------- */

.ref-list { list-style: none; padding: 0; margin: 0; max-width: none; }
.ref-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}
.ref-list li:last-child { border-bottom: 0; }
.ref-list .ref-org {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.15rem;
}

/* --- footer ------------------------------------------------------------------- */

.back-top { text-align: center; margin-top: 2.5rem; }
.back-top a {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--text-muted);
}

.report-footer {
  background: var(--bg-dark);
  color: var(--text-inverse);
  padding: 3rem var(--gutter) 2.2rem;
  margin-top: 5rem;
  border-top: 4px solid var(--accent);
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.footer-inner h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  margin: 0 0 1.2rem;
  color: var(--accent-light);
}
.footer-inner p { color: rgba(240, 237, 230, 0.66); font-size: 0.85rem; max-width: 70ch; }
.footer-inner a { color: var(--accent-light); }
.footer-meta {
  display: flex; flex-wrap: wrap; gap: 0.6rem 2rem;
  margin-top: 1.8rem; padding-top: 1.4rem;
  border-top: 1px solid rgba(240, 237, 230, 0.14);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(240, 237, 230, 0.5);
}
.cite-box strong { color: var(--accent-light); }
.cite-box {
  background: rgba(0, 0, 0, 0.22);
  border-left: 3px solid var(--accent);
  padding: 0.9rem 1.1rem;
  margin: 1.4rem 0 0;
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(240, 237, 230, 0.78);
  font-family: var(--mono);
  overflow-wrap: anywhere;
}

/* --- responsive ---------------------------------------------------------------- */

@media (max-width: 760px) {
  :root { --gutter: 1.25rem; }
  .chart-pair { grid-template-columns: 1fr; }
  .masthead { padding-top: 2.2rem; padding-bottom: 2.2rem; }
  .masthead .meta-row { gap: 1rem 2rem; }
  .chart-frame { height: 300px; }
  .chart-frame--tall { height: 360px; }
  .content { padding-top: 2.2rem; }
  .sitebar__links { gap: 1rem; }
}

@media (max-width: 520px) {
  .matrix { font-size: 0.7rem; }
  .matrix tbody th { min-width: 7.5rem; font-size: 0.7rem; }
}

/* --- print ---------------------------------------------------------------------- */

@media print {
  :root { --bg: #fff; --max-width: 100%; }
  .sticky-nav, .sitebar, .progress, .back-top { display: none !important; }
  body { font-size: 10.5pt; }
  .masthead, .report-footer { background: #fff; color: #000; border-color: #999; }
  .masthead .overline, .masthead .meta-row strong, .footer-inner h3 { color: #8b6914; }
  .masthead .subtitle, .masthead .meta-row, .footer-inner p { color: #333; }
  .content { padding: 1rem 0; }
  section { break-inside: auto; page-break-inside: auto; }
  section > h2 { break-after: avoid; page-break-after: avoid; }
  .chart-container, .exec-card, .stat-card, .callout, .tbl-scroll {
    break-inside: avoid; page-break-inside: avoid;
  }
  a { color: #000; text-decoration: underline; }
}