/* tech-hiring-gap: shared styles for the story page and the sources page.
   Tokens come from the dataviz skill's validated reference palette (palette.md). */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #6f6d67;        /* axis/labels; darker than the palette's #898781 so small text clears 4.5:1 */
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --ring: rgba(11, 11, 11, 0.10);
  --s1: #2a78d6;           /* categorical slot 1, blue */
  --s2: #eb6834;           /* categorical slot 2, orange */
  --context: #898781;      /* de-emphasis gray for comparison series */
  --accent-text: #1c5cab;
  --serif: "Iowan Old Style", "Source Serif 4", "Noto Serif", "Palatino Linotype", Palatino, "Charter", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --ink: #ffffff; --ink-2: #c3c2b7; --muted: #a3a198;
    --grid: #2c2c2a; --axis: #383835; --ring: rgba(255, 255, 255, 0.10);
    --s1: #3987e5; --s2: #d95926; --context: #898781; --accent-text: #86b6ef;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --ink: #ffffff; --ink-2: #c3c2b7; --muted: #a3a198;
  --grid: #2c2c2a; --axis: #383835; --ring: rgba(255, 255, 255, 0.10);
  --s1: #3987e5; --s2: #d95926; --context: #898781; --accent-text: #86b6ef;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent-text); text-underline-offset: 2px; }
.wrap { max-width: 900px; margin: 0 auto; padding: 0 20px; }
.prose { max-width: 680px; }

/* masthead */
.mast { padding: 72px 0 36px; }
.eyebrow { font-size: 12.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 18px; font-weight: 600; }
h1 { font-family: var(--serif); font-size: clamp(38px, 7vw, 72px); line-height: 1.02; letter-spacing: -0.025em; margin: 0 0 22px; font-weight: 700; max-width: 14em; text-wrap: balance; }
.dek { font-family: var(--serif); font-size: clamp(19px, 2.4vw, 23px); line-height: 1.5; color: var(--ink-2); max-width: 620px; margin: 0; }
.hero { margin-top: 44px; }
.hero-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 28px; padding-top: 22px; border-top: 2px solid var(--ink); }
.hero-stats > div { display: flex; flex-direction: column; gap: 6px; }
.hs-val { font-family: var(--serif); font-size: clamp(34px, 5vw, 46px); line-height: 1; font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.hs-val i { font-style: normal; color: var(--muted); font-weight: 400; margin: 0 .18em; }
.hs-lab { font-size: 13.5px; line-height: 1.4; color: var(--ink-2); max-width: 24em; }
.hero-spark { margin-top: 26px; }
.hero-spark svg { display: block; width: 100%; height: auto; overflow: visible; }

/* sticky nav with reading progress */
.nav { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--page) 86%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--grid); }
.nav-in { max-width: 900px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; gap: 22px; height: 48px; font-size: 14px; }
.nav-home { font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap; letter-spacing: -.01em; }
.nav-links { display: flex; gap: 4px; flex: 1; overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a { color: var(--ink-2); text-decoration: none; padding: 6px 10px; border-radius: 999px; white-space: nowrap; }
.nav-links a:hover { color: var(--ink); background: var(--ring); }
.nav-links a.on { color: var(--ink); background: var(--ring); font-weight: 600; }
#theme { flex: none; width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--axis); background: transparent; color: var(--ink-2); font-size: 15px; cursor: pointer; }
#theme:hover { color: var(--ink); border-color: var(--ink-2); }
#theme:focus-visible, .nav-links a:focus-visible { outline: 2px solid var(--s1); outline-offset: 2px; }
.nav-bar { height: 2px; background: var(--s1); transform: scaleX(0); transform-origin: left; }

/* chapters */
.chapter { padding: 72px 0 8px; border-top: 1px solid var(--grid); margin-top: 56px; position: relative; }
.chapter:first-of-type { border-top: 0; margin-top: 0; padding-top: 40px; }
.chap-num { font-family: var(--serif); font-size: clamp(72px, 13vw, 120px); line-height: .85; font-weight: 700; color: transparent; -webkit-text-stroke: 1.5px var(--muted); margin: 0 0 10px; letter-spacing: -0.03em; display: flex; flex-direction: column; }
.chap-num span { font-family: var(--sans); font-size: 12.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); -webkit-text-stroke: 0; font-weight: 600; margin-bottom: 10px; line-height: 1; }
h2 { font-family: var(--serif); font-size: clamp(30px, 4.6vw, 44px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 20px; max-width: 18em; text-wrap: balance; }
p { margin: 0 0 16px; }
.prose p { font-family: var(--serif); font-size: 19px; line-height: 1.65; }
.prose p.lede { font-size: 21px; color: var(--ink); }
.prose strong { font-weight: 700; }
.caveat { font-family: var(--sans); font-size: 15px; color: var(--ink-2); border-left: 3px solid var(--s2); background: color-mix(in srgb, var(--s2) 7%, transparent); border-radius: 0 10px 10px 0; padding: 12px 16px; margin: 24px 0; }
.prose .caveat, .prose p.caveat { font-family: var(--sans); font-size: 15px; line-height: 1.55; }
.caveat strong { color: var(--ink); }

/* stat tiles */
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 24px 0; }
.tile { background: var(--surface); border-radius: 14px; padding: 18px 20px; box-shadow: 0 0 0 1px var(--ring), 0 1px 2px rgba(0,0,0,.04); border-top: 3px solid var(--s1); }
.tile .lab { font-size: 14px; color: var(--ink-2); margin-bottom: 4px; }
.tile .val { font-family: var(--serif); font-size: 38px; line-height: 1.05; font-weight: 700; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.tile .sub { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* figures */
figure { margin: 32px 0 12px; background: var(--surface); border-radius: 16px; padding: 22px 22px 14px; box-shadow: 0 0 0 1px var(--ring), 0 2px 10px rgba(0,0,0,.05); }
figcaption.title { font-family: var(--serif); font-size: 20px; font-weight: 700; letter-spacing: -.01em; margin: 0 0 4px; }
figcaption.sub { font-size: 14px; color: var(--ink-2); margin: 0 0 12px; }
.src { font-size: 13px; color: var(--muted); margin: 10px 0 0; }
.src a { color: var(--muted); }
.chart { position: relative; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart svg:focus-visible { outline: 2px solid var(--s1); outline-offset: 4px; border-radius: 4px; }
.grid { stroke: var(--grid); stroke-width: 1; }
.axis-line { stroke: var(--axis); stroke-width: 1; }
.ref { stroke: var(--axis); stroke-width: 1; }
.event { stroke: var(--axis); stroke-width: 1; }
.event-label { fill: var(--ink-2); font-size: 12px; }
.cross { stroke: var(--axis); stroke-width: 1; }
.tick { fill: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.end-label { fill: var(--ink); font-size: 12.5px; font-weight: 600; }
.end-value { fill: var(--ink-2); font-size: 12px; font-weight: 400; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; list-style: none; margin: 0 0 8px; padding: 0; font-size: 13.5px; color: var(--ink-2); }
.legend li { display: flex; align-items: center; gap: 7px; }
.key.line { display: inline-block; width: 16px; height: 3px; border-radius: 2px; }
.tip { position: absolute; pointer-events: none; background: var(--surface); color: var(--ink); border-radius: 8px; padding: 8px 10px; font-size: 13px; box-shadow: 0 0 0 1px var(--ring), 0 6px 18px rgba(0,0,0,.14); min-width: 120px; z-index: 5; }
.tip-title { color: var(--muted); font-size: 12px; margin-bottom: 4px; }
.tip-row { display: flex; align-items: center; gap: 8px; line-height: 1.5; }
.tip-row strong { font-size: 14px; font-variant-numeric: tabular-nums; }
.tip-name { color: var(--ink-2); }
.panels { display: grid; gap: 4px; }
.event-key { margin: 0 0 6px; padding-left: 18px; font-size: 12.5px; color: var(--ink-2); }
.panel-title { font-size: 13px; color: var(--ink-2); font-weight: 600; margin: 8px 0 0 52px; }
.table-view { margin-top: 10px; font-size: 13px; }
.table-view summary { cursor: pointer; color: var(--ink-2); }
.table-scroll { max-height: 260px; overflow: auto; margin-top: 8px; border-radius: 8px; box-shadow: 0 0 0 1px var(--ring); }
.table-view table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
.table-view th, .table-view td { padding: 5px 10px; text-align: left; border-bottom: 1px solid var(--grid); }
.table-view td.num, .table-view th:not(:first-child) { text-align: right; }
.table-view thead th { position: sticky; top: 0; background: var(--surface); }

.next { margin: 56px 0 72px; padding: 22px 24px; border-radius: 12px; background: var(--surface); box-shadow: 0 0 0 1px var(--ring); color: var(--ink-2); }
footer { font-family: var(--serif); border-top: 1px solid var(--grid); padding: 24px 0 48px; font-size: 14px; color: var(--muted); }

/* sources page */
.srcs article { background: var(--surface); border-radius: 12px; padding: 18px 20px; box-shadow: 0 0 0 1px var(--ring); margin: 16px 0; }
.srcs h2 { font-size: 20px; margin: 0 0 2px; }
.srcs .pub { color: var(--ink-2); margin: 0 0 10px; font-size: 15px; }
.srcs dt { font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-top: 10px; }
.srcs dd { margin: 2px 0 0; font-size: 15px; word-break: break-word; }
.used-in a { margin-right: 10px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .mast { padding-top: 36px; }
  .tile .val { font-size: 28px; }
  figure { padding: 14px 10px 10px; border-radius: 10px; }
}

/* chapter 6: causes table and loop diagram */
.table-wrap { overflow-x: auto; margin: 24px 0; border-radius: 12px; box-shadow: 0 0 0 1px var(--ring); background: var(--surface); }
table.causes { border-collapse: collapse; width: 100%; min-width: 720px; font-size: 14.5px; line-height: 1.45; }
table.causes th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); padding: 12px 14px; border-bottom: 1px solid var(--grid); }
table.causes td { vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--grid); }
table.causes tr:last-child td { border-bottom: 0; }
table.causes td:first-child { font-weight: 600; width: 19%; }
.badge { display: inline-flex; gap: 7px; align-items: center; font-weight: 600; white-space: nowrap; }
.badge svg { flex: none; align-self: center; }
.loops svg { display: block; width: 100%; height: auto; color: var(--ink); }
.loops .node { fill: var(--surface); stroke-width: 1.5; }
.loops .node.meas { stroke: var(--s1); }
.loops .node.infer { stroke: var(--ink-2); stroke-dasharray: 5 4; }
.loops .shock { fill: var(--surface); stroke: var(--ink); stroke-width: 1.5; }
.loops text { fill: var(--ink); font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.loops .nt { font-size: 12.5px; font-weight: 600; }
.loops .ns { font-size: 11px; fill: var(--ink-2); }
.loops .el { font-size: 11px; fill: var(--ink-2); }
.loops .lt { font-size: 13.5px; font-weight: 650; }
.loops .edge { fill: none; stroke: var(--ink-2); stroke-width: 1.5; }
.loops .rr { fill: var(--surface); stroke: var(--s1); stroke-width: 1.5; }
.loops .rl { font-size: 12px; font-weight: 700; text-anchor: middle; }
.loops .leg { font-size: 11.5px; fill: var(--ink-2); }
@media (max-width: 560px) { .loops svg { min-width: 640px; } .loops .scroll { overflow-x: auto; } }

.hint { display: none; font-size: 13px; color: var(--muted); margin: 0 0 8px; }
@media (max-width: 560px) { .hint { display: block; } }

/* motion: fade-up on enter (class added by ui.js only when motion is allowed) */
.rv { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .rv { opacity: 1; transform: none; transition: none; } }
@media (max-width: 560px) {
  .mast { padding-top: 44px; }
  .nav-home { display: none; }
  .nav-in { gap: 8px; }
  .prose p { font-size: 18px; }
  figure { padding: 16px 12px 10px; }
}