/* ═══════════════════════════════════════════════════════════
   PRICE OF INTELLIGENCE — S18
   Five SVG charts tracking the cost curves of intelligence,
   light, compute, energy, and biology. Data-journalism page.
   Vanilla JS. Static snapshot.
   ═══════════════════════════════════════════════════════════ */

.pi-main {
  background: var(--paper);
  color: var(--ink);
}

/* Local palette — chart-line colors only.
   Site vocabulary (--paper, --ink, --accent) used everywhere else. */
.pi-main {
  --pi-intelligence: var(--accent);
  --pi-light:        oklch(0.75 0.12 85);
  --pi-compute:      oklch(0.65 0.14 230);
  --pi-energy:       oklch(0.70 0.10 155);
  --pi-bio:          oklch(0.68 0.16 330);
  --pi-material:     oklch(0.60 0.04 80);
  --pi-grid:         color-mix(in oklab, var(--ink) 12%, transparent);
  --pi-soft:         color-mix(in oklab, var(--paper) 80%, var(--ink) 4%);
}

/* ── Hero ───────────────────────────────────────────────────── */
.pi-hero {
  padding: 120px 48px 60px;
  max-width: 1280px;
  margin: 0 auto;
}
.pi-title { margin-top: 22px; }
.pi-kicker {
  margin-top: 24px;
  max-width: 740px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.pi-dateline {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  max-width: 1000px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.pi-dateline .label { color: var(--ink-dim); }
.pi-dateline .value {
  color: var(--ink);
  margin-top: 4px;
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 12px;
}

/* ── Section wrapper ───────────────────────────────────────── */
.pi-section {
  padding: 72px 48px;
  max-width: 1280px;
  margin: 0 auto;
}
.pi-section .section-label { margin-bottom: 26px; }

/* ── Prose ──────────────────────────────────────────────────── */
.pi-prose { max-width: 760px; }
.pi-prose p {
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
}
.pi-lede {
  font-family: "Newsreader", Georgia, serif;
  font-style: italic;
  font-size: 24px !important;
  line-height: 1.4 !important;
  color: var(--ink) !important;
}
.pi-note {
  max-width: 820px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-bottom: 28px;
}

/* ── Callout box ────────────────────────────────────────────── */
.pi-callout {
  margin-top: 32px;
  padding: 18px 22px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  max-width: 760px;
}
.pi-callout strong {
  color: var(--accent);
  font-weight: 500;
  font-size: 14px;
}

/* ── Controls ─────────────────────────────────────────────── */
.pi-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
  padding: 14px 18px;
  border: 1px solid var(--ink);
  background: var(--paper);
}
.pi-filter-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-right: 8px;
}
.pi-filter-divider {
  width: 1px;
  height: 16px;
  background: var(--ink-dim);
  margin: 0 12px;
  opacity: 0.5;
}
.pi-pill {
  appearance: none;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 6px 12px;
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, transform 120ms ease;
}
.pi-pill:hover { transform: translateY(-1px); }
.pi-pill.active,
.pi-pill[data-active="true"] {
  background: var(--ink);
  color: var(--paper);
}

/* ── Chart wrapper ──────────────────────────────────────────── */
.pi-chart-wrap {
  position: relative;
  margin-top: 8px;
  border: 1px solid var(--ink);
  background: var(--paper);
  padding: 14px;
  overflow: hidden;
}
.pi-chart-wrap svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ── Chart internals (SVG styled via CSS) ───────────────────── */
.pi-line {
  fill: none;
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}
.pi-line-intelligence { stroke: var(--pi-intelligence); }
.pi-line-light        { stroke: var(--pi-light); }
.pi-line-compute      { stroke: var(--pi-compute); }
.pi-line-energy       { stroke: var(--pi-energy); }
.pi-line-bio          { stroke: var(--pi-bio); }
.pi-line-material     { stroke: var(--pi-material); }

.pi-dot {
  r: 3;
  fill: var(--paper);
  stroke-width: 1.4;
}
.pi-dot-intelligence { stroke: var(--pi-intelligence); }
.pi-dot-light        { stroke: var(--pi-light); }
.pi-dot-compute      { stroke: var(--pi-compute); }
.pi-dot-energy       { stroke: var(--pi-energy); }
.pi-dot-bio          { stroke: var(--pi-bio); }
.pi-dot-material     { stroke: var(--pi-material); }

.pi-axis {
  stroke: var(--ink);
  stroke-width: 1;
}
.pi-axis-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  fill: var(--ink-dim);
}
.pi-grid-line,
.pi-grid {
  stroke: var(--pi-grid);
  stroke-width: 1;
}
.pi-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  fill: var(--ink);
}
.pi-axis-title {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  fill: var(--ink-soft);
}
.pi-scatter-label,
.pi-series-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  fill: var(--ink);
}
.pi-diag-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  font-style: italic;
  fill: var(--ink-dim);
}
.pi-zone-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  fill: var(--ink-soft);
}
.pi-zone-sub {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.04em;
  fill: var(--ink-dim);
}
.pi-ref-line {
  stroke: var(--ink-dim);
  stroke-width: 1.2;
  stroke-dasharray: 6 4;
  fill: none;
}
.pi-ref-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  fill: var(--ink-dim);
  font-style: italic;
}

.pi-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 8px 10px;
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--ink);
  box-shadow: 0 6px 24px -10px rgba(0, 0, 0, 0.4);
  z-index: 10;
  white-space: nowrap;
}
.pi-tooltip strong { color: var(--accent); font-weight: 500; }
.pi-tooltip-dim { color: var(--ink-dim); }

/* ── Cascade diagram ("What Binds Next") ────────────────────── */
.pi-cascade {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  max-width: 560px;
  margin: 32px auto 0;
}
.pi-cascade-node {
  width: 100%;
  padding: 18px 22px;
  border: 1px solid var(--ink-dim);
  background: var(--pi-soft);
  text-align: center;
}
.pi-cascade-node-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 6px;
}
.pi-cascade-node-stat {
  font-family: "Newsreader", Georgia, serif;
  font-size: 22px;
  line-height: 1.2;
  color: var(--ink);
}
.pi-cascade-arrow {
  width: 1px;
  height: 28px;
  border-left: 1px solid var(--ink-dim);
  position: relative;
}
.pi-cascade-arrow::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: -4px;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid var(--ink-dim);
}
.pi-cascade-bottleneck {
  border-color: var(--accent);
  border-width: 2px;
}
.pi-cascade-bottleneck .pi-cascade-node-stat {
  color: var(--accent);
}
.pi-cascade-quote {
  margin-top: 28px;
  padding: 18px 22px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-family: "Newsreader", Georgia, serif;
  font-style: italic;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink);
  text-align: center;
  max-width: 560px;
}
.pi-cascade-quote cite {
  display: block;
  margin-top: 10px;
  font-family: "DM Mono", ui-monospace, monospace;
  font-style: normal;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ── Receipts grid ──────────────────────────────────────────── */
.pi-receipts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.pi-receipt {
  padding: 16px;
  border: 1px solid var(--ink-dim);
  background: var(--pi-soft);
}
.pi-receipt-label {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.pi-receipt-value {
  font-family: "Newsreader", Georgia, serif;
  font-size: 26px;
  line-height: 1.1;
  color: var(--ink);
}
.pi-receipt-value .small {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  margin-left: 4px;
  text-transform: lowercase;
}

/* ── Figcaption ─────────────────────────────────────────────── */
.pi-figcaption {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  margin-top: 10px;
  max-width: 760px;
}

/* ── Colophon ───────────────────────────────────────────────── */
.pi-colophon-section { padding-bottom: 80px; }
.pi-method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}
.pi-method-grid p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-top: 8px;
}
.pi-method-head {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--ink-dim);
}
.pi-method-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 26px;
}

/* ── Related labs aside ─────────────────────────────────────── */
.pi-related {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 48px 110px;
}
.pi-related .section-label { margin-bottom: 24px; }
.pi-related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.pi-related-card {
  padding: 18px;
  border-top: 2px solid var(--ink);
  background: var(--pi-soft);
}
.pi-related-card .pi-card-kicker {
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.pi-related-card h3 {
  font-family: "Newsreader", Georgia, serif;
  font-size: 19px;
  margin: 8px 0 6px;
}
.pi-related-card h3 a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink-dim);
}
.pi-related-card h3 a:hover { color: var(--accent); }
.pi-related-card p {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  .pi-hero,
  .pi-section,
  .pi-related { padding-left: 24px; padding-right: 24px; }
  .pi-dateline { grid-template-columns: 1fr; }
  .pi-receipts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pi-related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pi-controls { padding: 10px 12px; gap: 4px; }
  .pi-pill { padding: 5px 9px; font-size: 10px; }
  .pi-cascade { max-width: 100%; }
  .pi-cascade-node { padding: 14px 16px; }
}
@media (max-width: 540px) {
  .pi-hero { padding-top: 90px; }
  .pi-receipts { grid-template-columns: 1fr; }
  .pi-related-grid { grid-template-columns: 1fr; }
  .pi-receipt-value { font-size: 22px; }
  .pi-cascade-node-stat { font-size: 18px; }
}