/* ============ Tokens ============ */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f3f2ee;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --bar-muted: #d6d4cc;
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100; --s5: #e87ba4;
  --accent-ink: #1c5cab;
  --critical: #d03b3b;
  --good-ink: #006300;
  --div-neg: #1c5cab; --div-mid: #f0efec; --div-pos: #b8312f;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.05);
  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --surface-2: #232321;
    --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
    --grid: #2c2c2a; --axis: #383835; --border: rgba(255,255,255,0.10);
    --bar-muted: #3d3d3a;
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181;
    --accent-ink: #86b6ef; --good-ink: #0ca30c;
    --div-neg: #3987e5; --div-mid: #383835; --div-pos: #e66767;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --surface-2: #232321;
  --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781;
  --grid: #2c2c2a; --axis: #383835; --border: rgba(255,255,255,0.10);
  --bar-muted: #3d3d3a;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181;
  --accent-ink: #86b6ef; --good-ink: #0ca30c;
  --div-neg: #3987e5; --div-mid: #383835; --div-pos: #e66767;
  --shadow: none;
}

/* ============ Base ============ */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 16px/1.6 var(--font); -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-ink); text-underline-offset: 2px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }

/* ============ Top bar ============ */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--page) 85%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar .wrap { display: flex; align-items: center; gap: 16px; height: 56px; }
.brand { font-weight: 650; font-size: 15px; letter-spacing: -.01em; white-space: nowrap; }
.brand span { color: var(--muted); font-weight: 500; }
.nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a {
  color: var(--ink-2); text-decoration: none; font-size: 14px; padding: 6px 10px;
  border-radius: 8px; white-space: nowrap;
}
.nav a:hover { background: var(--surface-2); color: var(--ink); }
.icon-btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--ink-2);
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer; flex: none;
  display: grid; place-items: center;
}
.icon-btn:hover { color: var(--ink); }
@media (max-width: 760px) { .nav { display: none; } .icon-btn { margin-left: auto; } }

/* ============ Hero ============ */
.hero { padding-top: 64px; padding-bottom: 32px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600;
  letter-spacing: .06em; text-transform: uppercase; color: var(--accent-ink);
}
.eyebrow::before { content: ""; width: 18px; height: 2px; background: currentColor; border-radius: 2px; }
h1 {
  font-size: clamp(32px, 5.2vw, 56px); line-height: 1.05; letter-spacing: -.035em;
  margin: 16px 0 20px; font-weight: 720; max-width: 18ch; text-wrap: balance;
}
.lede { font-size: clamp(17px, 2vw, 20px); color: var(--ink-2); max-width: 64ch; margin: 0; text-wrap: pretty; }
.byline { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 24px; font-size: 14px; color: var(--muted); }
.byline b { color: var(--ink-2); font-weight: 600; }

/* ============ KPI grid ============ */
.kpis {
  display: grid; grid-template-columns: 1.35fr 1fr 1fr; gap: 16px; margin: 40px 0 8px;
}
.kpi {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 6px;
}
.kpi .label { font-size: 14px; color: var(--ink-2); }
.kpi .value { font-size: 34px; font-weight: 680; letter-spacing: -.03em; line-height: 1.1; }
.kpi .sub { font-size: 13px; color: var(--muted); }
.kpi.hero-kpi { grid-row: span 2; justify-content: space-between; }
.kpi.hero-kpi .value { font-size: clamp(64px, 9vw, 96px); letter-spacing: -.05em; }
.badge {
  display: inline-flex; align-items: center; gap: 6px; align-self: flex-start;
  font-size: 13px; font-weight: 600; padding: 4px 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--critical) 12%, transparent); color: var(--ink);
}
.badge svg { color: var(--critical); }
.spark { width: 100%; height: 56px; display: block; margin-top: 4px; }
@media (max-width: 860px) {
  .kpis { grid-template-columns: 1fr 1fr; }
  .kpi.hero-kpi { grid-column: span 2; grid-row: auto; }
}
@media (max-width: 480px) {
  .kpi .value { font-size: 28px; }
  .kpi { padding: 16px; }
}

/* ============ Findings ============ */
.findings {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 24px 0 0;
  padding: 0; list-style: none; counter-reset: f;
}
.findings li {
  counter-increment: f; border-top: 2px solid var(--ink); padding-top: 14px;
  font-size: 15px; color: var(--ink-2);
}
.findings li::before {
  content: "0" counter(f); display: block; font-size: 13px; font-weight: 700;
  color: var(--muted); margin-bottom: 6px; font-variant-numeric: tabular-nums;
}
.findings strong { color: var(--ink); font-weight: 650; }
@media (max-width: 860px) { .findings { grid-template-columns: 1fr; } }

/* ============ Sections ============ */
section.chapter { padding-top: 56px; padding-bottom: 8px; scroll-margin-top: 64px; }
.chapter-head { display: grid; grid-template-columns: 220px 1fr; gap: 24px; margin-bottom: 24px; }
.chapter-num { font-size: 13px; font-weight: 700; letter-spacing: .08em; color: var(--muted); text-transform: uppercase; padding-top: 8px; }
.chapter h2 {
  font-size: clamp(24px, 3.2vw, 34px); line-height: 1.15; letter-spacing: -.025em;
  margin: 0 0 12px; font-weight: 700; text-wrap: balance;
}
.chapter p.intro { margin: 0; color: var(--ink-2); max-width: 68ch; text-wrap: pretty; }
@media (max-width: 860px) { .chapter-head { grid-template-columns: 1fr; gap: 4px; } .chapter-num { padding: 0; } }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); margin-bottom: 16px; min-width: 0;
}
@media (max-width: 640px) { .card { padding: 16px 12px; border-radius: 12px; } }
.card h3 { font-size: 17px; margin: 0 0 4px; font-weight: 650; letter-spacing: -.01em; }
.card .desc { font-size: 14px; color: var(--ink-2); margin: 0 0 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }

.card-foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px;
  margin-top: 12px; font-size: 12.5px; color: var(--muted);
}

/* ============ Chart chrome ============ */
.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; overflow: visible; }
.chart text { font-family: var(--font); }
.chart .tick { font-size: 11.5px; fill: var(--muted); font-variant-numeric: tabular-nums; }
.chart .gridline { stroke: var(--grid); stroke-width: 1; shape-rendering: crispEdges; }
.chart .baseline { stroke: var(--axis); stroke-width: 1; shape-rendering: crispEdges; }
.chart .lbl { font-size: 12px; fill: var(--ink-2); }
.chart .lbl-strong { font-size: 12.5px; fill: var(--ink); font-weight: 650; font-variant-numeric: tabular-nums; }
.chart .annot-line { stroke: var(--muted); stroke-width: 1; shape-rendering: crispEdges; }
.chart .annot { font-size: 11.5px; fill: var(--ink-2); }
.chart .crosshair { stroke: var(--ink-2); stroke-width: 1; shape-rendering: crispEdges; pointer-events: none; }
.chart .hit { fill: transparent; cursor: crosshair; outline: none; }
.chart .hit:focus-visible { stroke: var(--accent-ink); stroke-width: 2; }
.chart .mark { transition: opacity .15s; }
.chart .dimmed { opacity: .35; }

.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0 0 14px; font-size: 13px; color: var(--ink-2); padding: 0; list-style: none; }
.legend li { display: inline-flex; align-items: center; gap: 8px; }
.legend .key-line { width: 16px; height: 2px; border-radius: 2px; }
.legend .key-rect { width: 10px; height: 10px; border-radius: 3px; }
.legend .key-dot { width: 10px; height: 10px; border-radius: 50%; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 16px; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; font: inherit; font-size: 13px;
  padding: 6px 12px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface); color: var(--ink-2); cursor: pointer; min-height: 32px;
}
.chip .key-line { width: 14px; height: 2px; border-radius: 2px; }
.chip[aria-pressed="true"] { background: var(--surface-2); color: var(--ink); border-color: color-mix(in srgb, var(--ink) 25%, transparent); }
.chip[aria-pressed="false"] .key-line { opacity: .3; }
.chip:disabled { cursor: default; }

.tooltip {
  position: absolute; z-index: 10; pointer-events: none; min-width: 150px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,.12); padding: 10px 12px; font-size: 12.5px;
  opacity: 0; transition: opacity .1s; color: var(--ink-2);
}
.tooltip.on { opacity: 1; }
.tooltip .tt-title { font-weight: 600; color: var(--ink); margin-bottom: 6px; font-size: 12.5px; }
.tooltip .tt-row { display: flex; align-items: center; gap: 8px; line-height: 1.7; }
.tooltip .tt-row .k { width: 12px; height: 2px; border-radius: 2px; flex: none; }
.tooltip .tt-row .k.rect { height: 10px; width: 10px; border-radius: 3px; }
.tooltip .tt-row .v { font-weight: 650; color: var(--ink); font-variant-numeric: tabular-nums; min-width: 46px; }
.tooltip .tt-sep { border-top: 1px solid var(--border); margin: 6px 0 4px; }

/* Heatmap scale */
.scale { display: flex; align-items: center; gap: 10px; font-size: 12px; color: var(--muted); margin-top: 12px; flex-wrap: wrap; }
.scale .bar { width: 200px; height: 10px; border-radius: 3px; }

/* Data tables */
details.data { font-size: 13px; }
details.data summary {
  cursor: pointer; color: var(--ink-2); font-weight: 500; list-style: none;
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 0;
}
details.data summary::-webkit-details-marker { display: none; }
details.data summary::before { content: "▸"; font-size: 11px; transition: transform .15s; }
details.data[open] summary::before { transform: rotate(90deg); }
.table-wrap { max-height: 320px; overflow: auto; margin-top: 8px; border: 1px solid var(--border); border-radius: 10px; width: 100%; }
details.data[open] { flex-basis: 100%; }
table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
th, td { padding: 6px 12px; text-align: right; border-bottom: 1px solid var(--grid); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { position: sticky; top: 0; background: var(--surface-2); color: var(--ink-2); font-weight: 600; }

/* Callouts & prose */
.callout {
  border-left: 3px solid var(--s1); background: var(--surface); padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0; color: var(--ink-2); font-size: 15px; margin: 16px 0;
}
.callout strong { color: var(--ink); }
.recs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.rec { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.rec h3 { font-size: 16px; margin: 0 0 4px; }
.rec .who { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.rec ul { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 14.5px; }
.rec li { margin: 6px 0; }
@media (max-width: 900px) { .recs { grid-template-columns: 1fr; } }

.method { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 40px; font-size: 14.5px; color: var(--ink-2); }
.method h3 { font-size: 15px; color: var(--ink); margin: 0 0 6px; }
.method p, .method ul { margin: 0 0 8px; }
.method ul { padding-left: 18px; }
.method code { font-size: 13px; background: var(--surface-2); padding: 1px 6px; border-radius: 5px; }
@media (max-width: 860px) { .method { grid-template-columns: 1fr; } }

.pipeline { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 4px 0 24px; font-size: 13.5px; }
.pipeline .step { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 8px 14px; }
.pipeline .step b { display: block; font-size: 13.5px; color: var(--ink); }
.pipeline .step span { color: var(--muted); font-size: 12.5px; }
.pipeline .arrow { color: var(--muted); }

footer { border-top: 1px solid var(--border); margin-top: 64px; padding: 28px 0 48px; font-size: 13.5px; color: var(--muted); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.loading { opacity: .5; }

/* ============ Project 2 additions ============ */
:root {
  --seq-1: #86b6ef; --seq-2: #5598e7; --seq-3: #2a78d6; --seq-4: #1c5cab; --seq-5: #0d366b;
  --map-context: #fcfcfb; --map-context-line: #d6d4cc; --map-missing: #b9b7ae;
  --seg-other: #52514e;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --seq-1: #184f95; --seq-2: #256abf; --seq-3: #3987e5; --seq-4: #6da7ec; --seq-5: #b7d3f6;
    --map-context: #1a1a19; --map-context-line: #3a3a37; --map-missing: #5a5a55; --seg-other: #c3c2b7;
  }
}
:root[data-theme="dark"] {
  --seq-1: #184f95; --seq-2: #256abf; --seq-3: #3987e5; --seq-4: #6da7ec; --seq-5: #b7d3f6;
  --map-context: #1a1a19; --map-context-line: #3a3a37; --map-missing: #5a5a55; --seg-other: #c3c2b7;
}
.badge-neutral { background: var(--surface-2); color: var(--ink-2); font-weight: 500; }
.map-layout { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 32px; align-items: start; }
@media (max-width: 900px) { .map-layout { grid-template-columns: 1fr; } }
.map-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 12px; font-size: 12.5px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.map-legend span { display: inline-flex; align-items: center; gap: 6px; }
.map-legend i { width: 14px; height: 10px; border-radius: 3px; display: inline-block; }
.chip[role="radio"][aria-checked="true"] { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.segments { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 16px; }
@media (max-width: 1000px) { .segments { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .segments { grid-template-columns: 1fr; } }
.seg { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px; }
.seg-head { display: flex; align-items: center; gap: 10px; }
.seg-head i { width: 12px; height: 12px; border-radius: 50%; flex: none; }
.seg h3 { font-size: 16px; margin: 0; letter-spacing: -.01em; }
.seg .members { font-size: 13px; color: var(--ink-2); }
.seg dl { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; margin: 0; font-size: 13px; }
.seg dt { color: var(--muted); }
.seg dd { margin: 0; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
.seg p { margin: 0; font-size: 13.5px; color: var(--ink-2); border-top: 1px solid var(--border); padding-top: 10px; }
.seg p b { color: var(--ink); }
.seg-list { padding: 10px 0; border-bottom: 1px solid var(--border); }
.seg-list:last-child { border-bottom: 0; }
.seg-list .seg-head { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.seg-list .seg-head i { width: 10px; height: 10px; border-radius: 50%; }
.seg-list p { margin: 4px 0 0 18px; font-size: 13.5px; color: var(--ink-2); }