/* ─────────────────────────────────────────────────────────────────────────
   stuartjeff.com — design system (Direction B · Operator's Manual)
   Tokens, layout, components. Light + dark.
   8px vertical rhythm. Reading column 60–68ch. Single ember accent.
   ───────────────────────────────────────────────────────────────────────── */

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ── Tokens — light (default) ───────────────────────────────────────────── */
:root {
  /* Color */
  --paper: #F2EFEA;
  --paper-2: #EAE6DF;          /* slightly elevated surface */
  --ink: #15110E;
  --ink-2: #2A2520;            /* body color, softer than display */
  --mid: #57524C;              /* muted text */
  --dim: #7A736B;              /* captions, labels */
  --rule: #D9D3C9;
  --rule-strong: #C9C4BC;
  --ember: #B8431A;
  --ember-bg: #F0DCC9;         /* very faint tint, for ember pill */

  /* Type */
  --sans: "Inter Tight", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Display / body sizes */
  --t-d1: 64px;   /* landing identity */
  --t-d2: 44px;   /* page H1 */
  --t-d3: 30px;   /* section H2 */
  --t-d4: 22px;   /* subsection / pullquote */
  --t-lede: 22px; /* landing lede */
  --t-body: 17px; /* primary reading */
  --t-sm: 14px;   /* captions */
  --t-mono-stat: 30px;
  --t-mono: 13px;
  --t-mono-xs: 11px;

  /* Tracking */
  --tr-tight: -0.028em;
  --tr-snug: -0.02em;
  --tr-display: -0.022em;

  /* Spacing — 8px grid */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;
  --s-11: 192px;

  /* Layout */
  --col-read: 64ch;
  --col-wide: 1120px;
  --gutter: 96px;
  --page-pad-x: clamp(20px, 4vw, 64px);
}

/* ── Tokens — dark ──────────────────────────────────────────────────────── */
html.theme-dark {
  --paper: #0F0D0B;
  --paper-2: #16130F;
  --ink: #E8E4DD;
  --ink-2: #D5CFC4;
  --mid: #ADA69D;
  --dim: #837C73;
  --rule: #26221E;
  --rule-strong: #3A332E;
  --ember: #D45C2A;
  --ember-bg: #2A1B12;
}

/* ── Base ───────────────────────────────────────────────────────────────── */
html { background: var(--paper); color: var(--ink); }
body {
  font-family: var(--sans);
  font-size: var(--t-body);
  line-height: 1.65;
  color: var(--ink-2);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "ss02", "cv11";
  font-synthesis: none;
}

::selection { background: var(--ember); color: var(--paper); }

/* ── Typography ─────────────────────────────────────────────────────────── */
.t-d1, .t-d2, .t-d3, .t-d4 { color: var(--ink); font-weight: 540; }
.t-d1 { font-size: var(--t-d1); line-height: 1.04; letter-spacing: var(--tr-tight); }
.t-d2 { font-size: var(--t-d2); line-height: 1.08; letter-spacing: var(--tr-tight); }
.t-d3 { font-size: var(--t-d3); line-height: 1.15; letter-spacing: var(--tr-snug); }
.t-d4 { font-size: var(--t-d4); line-height: 1.3;  letter-spacing: var(--tr-snug); }

.t-lede { font-size: var(--t-lede); line-height: 1.5; color: var(--ink-2); letter-spacing: -0.01em; font-weight: 400; }

.t-mono   { font-family: var(--mono); font-size: var(--t-mono); letter-spacing: 0.01em; }
.t-mono-xs { font-family: var(--mono); font-size: var(--t-mono-xs); letter-spacing: 0.06em; text-transform: uppercase; color: var(--dim); }
.t-mono-num { font-family: var(--mono); font-size: var(--t-mono-stat); font-weight: 500; letter-spacing: -0.01em; color: var(--ink); line-height: 1; }

.muted { color: var(--mid); }
.dim   { color: var(--dim); }
.ember { color: var(--ember); }

/* ── Layout ─────────────────────────────────────────────────────────────── */
.shell { max-width: var(--col-wide); margin: 0 auto; padding: 0 var(--page-pad-x); }
.shell-tight { max-width: 920px; margin: 0 auto; padding: 0 var(--page-pad-x); }

.gutter-row {
  display: grid;
  grid-template-columns: var(--gutter) 1fr;
  gap: 0;
}
@media (max-width: 760px) {
  /* Stack: label becomes a full-width marker above its section content */
  .gutter-row { grid-template-columns: 1fr; gap: 14px; }
}

.gutter-rule {
  border-left: 2px solid var(--ember);
  padding-left: 16px;
  font-family: var(--mono);
  font-size: var(--t-mono-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  line-height: 1.5;
  align-self: start;
  padding-top: 4px;
}
.gutter-body { padding-left: 24px; min-width: 0; }
@media (max-width: 760px) {
  .gutter-body { padding-left: 0; }
  .gutter-rule { padding-left: 10px; padding-top: 0; }
}

.read { max-width: var(--col-read); }

/* ── Top nav ────────────────────────────────────────────────────────────── */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--paper) 92%, transparent);
  backdrop-filter: saturate(120%) blur(6px);
  border-bottom: 1px solid var(--rule);
}
.site-nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  padding: 16px var(--page-pad-x);
  max-width: var(--col-wide);
  margin: 0 auto;
}
.wordmark {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.wordmark .bar { display: inline-block; width: 14px; height: 2px; background: var(--ember); }
.wordmark .sub { font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: 0.06em; text-transform: uppercase; margin-left: 6px; }

.nav-links { display: flex; align-items: center; gap: 4px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; }
.nav-links a {
  padding: 8px 10px;
  color: var(--mid);
  border-radius: 2px;
  position: relative;
  transition: color 120ms ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a[aria-current="page"] { color: var(--ink); }
.nav-links a[aria-current="page"]::after {
  content: ""; position: absolute; left: 10px; right: 10px; bottom: 2px;
  height: 2px; background: var(--ember);
}
.nav-tools { display: flex; align-items: center; gap: 6px; }
.theme-toggle {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--rule-strong);
  color: var(--mid);
  border-radius: 2px;
  transition: border-color 120ms ease, color 120ms ease;
}
.theme-toggle:hover { border-color: var(--ember); color: var(--ink); }
.theme-toggle svg { width: 14px; height: 14px; }
html.theme-dark .theme-toggle .icon-sun { display: block; }
html.theme-dark .theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

@media (max-width: 640px) {
  .wordmark .sub { display: none; }
}
/* Phone nav: brand + toggle on top, full-width link row beneath a hairline */
@media (max-width: 600px) {
  .site-nav-inner { flex-wrap: wrap; gap: 0 12px; }
  .wordmark { order: 1; }
  .nav-tools { order: 2; margin-left: auto; }
  .nav-links {
    order: 3; width: 100%;
    justify-content: space-between;
    gap: 0;
    margin-top: 12px; padding-top: 12px;
    border-top: 1px solid var(--rule);
    font-size: 12px;
  }
  .nav-links a { padding: 10px 6px; }
  .nav-links a[aria-current="page"]::after { left: 6px; right: 6px; bottom: 4px; }
  .theme-toggle { width: 36px; height: 36px; }
}

/* ── Sections ───────────────────────────────────────────────────────────── */
.section {
  padding: var(--s-9) 0;
}
.section + .section { border-top: 1px solid var(--rule); }
.section-tight { padding: var(--s-7) 0; }

.kicker {
  font-family: var(--mono);
  font-size: var(--t-mono-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 16px;
}
.kicker .em { color: var(--ember); }

/* ── Buttons / CTAs ─────────────────────────────────────────────────────── */
.cta {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 20px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.005em;
  border-radius: 2px;
  transition: transform 120ms ease, background 120ms ease;
}
.cta:hover { background: var(--ember); }
.cta .arrow { font-family: var(--mono); font-weight: 400; }

.link {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 120ms ease, color 120ms ease;
}
.link:hover { border-color: var(--ember); color: var(--ember); }
.link .arrow { color: var(--ember); margin-left: 4px; }

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  border: 1px solid var(--rule);
  padding: 32px;
  background: var(--paper);
}
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }

/* ── Proof tile (landing) ───────────────────────────────────────────────── */
.proof-row {
  border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: 1fr;
}
.proof-row .proof {
  display: grid; grid-template-columns: var(--gutter) 1fr;
  border-bottom: 1px solid var(--rule);
}
.proof .rule { border-left: 2px solid var(--ember); }
.proof .body { padding: 24px 0 24px 24px; display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 24px; }
.proof .desc { font-size: 15px; color: var(--mid); max-width: 48ch; line-height: 1.5; }
.proof .desc b { color: var(--ink); font-weight: 500; }
.proof .num { font-family: var(--mono); font-weight: 500; font-size: 30px; line-height: 1; color: var(--ember); letter-spacing: -0.01em; white-space: nowrap; }
.proof .num sub { font-family: var(--mono); font-size: 11px; color: var(--dim); vertical-align: baseline; margin-left: 6px; letter-spacing: 0.04em; }
@media (max-width: 760px) {
  .proof { grid-template-columns: 24px 1fr; }
  .proof .body { padding-left: 14px; grid-template-columns: 1fr; gap: 8px; }
  .proof .num { font-size: 26px; }
}

/* ── Chart ──────────────────────────────────────────────────────────────── */
.chart {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 6px;
  align-items: end;
  height: 220px;
  padding: 24px 0 0;
  border-bottom: 1px solid var(--rule-strong);
}
.chart .bar {
  background: var(--rule-strong);
  border-radius: 1px;
  position: relative;
  transition: background 120ms ease;
  min-height: 2px;
}
.chart .bar.hot { background: var(--ember); }
.chart .bar:hover { background: var(--ink); }
.chart-axis {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 6px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--dim);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 10px;
}
.chart-axis span { text-align: center; }
.chart-meta { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: 0.04em; text-transform: uppercase; margin-top: 12px; }
.chart-meta .legend { display: inline-flex; align-items: center; gap: 8px; }
.chart-meta .legend .sw { display: inline-block; width: 10px; height: 10px; background: var(--ember); border-radius: 1px; }
.chart-meta .legend .sw-rest { background: var(--rule-strong); }

/* ── Stat grid (mono) ───────────────────────────────────────────────────── */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.stat-grid .cell { padding: 24px; border-right: 1px solid var(--rule); }
.stat-grid .cell:last-child { border-right: 0; }
.stat-grid .cell .num { font-family: var(--mono); font-weight: 500; font-size: 28px; line-height: 1; color: var(--ink); letter-spacing: -0.01em; }
.stat-grid .cell .label { font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: 0.06em; text-transform: uppercase; margin-top: 10px; }
.stat-grid .cell .num .unit { color: var(--ember); font-size: 13px; margin-left: 4px; }
@media (max-width: 760px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid .cell:nth-child(2) { border-right: 0; }
  .stat-grid .cell:nth-child(-n+2) { border-bottom: 1px solid var(--rule); }
}

/* ── Lists ──────────────────────────────────────────────────────────────── */
.def-list { display: grid; grid-template-columns: 1fr; gap: 0; }
.def-list .row {
  display: grid;
  grid-template-columns: 220px 1fr auto;
  gap: 24px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
}
.def-list .row:last-child { border-bottom: 1px solid var(--rule); }
.def-list .row .name { font-family: var(--sans); font-weight: 540; font-size: 17px; color: var(--ink); letter-spacing: -0.005em; }
.def-list .row .desc { font-size: 15px; color: var(--mid); line-height: 1.5; }
.def-list .row .meta { font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: 0.04em; text-transform: uppercase; white-space: nowrap; }
@media (max-width: 760px) {
  .def-list .row { grid-template-columns: 1fr; gap: 6px; }
  .def-list .row .meta { font-size: 10px; }
}

/* ── Code ───────────────────────────────────────────────────────────────── */
pre.code, .code-block {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 20px 24px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
  letter-spacing: 0;
}
code.inline {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--paper-2);
  padding: 1px 6px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--ink);
}
.code-block .c-c { color: var(--dim); }      /* comment */
.code-block .c-k { color: var(--ember); }    /* keyword / accent */
.code-block .c-s { color: var(--mid); }      /* string-ish */

/* ── Pullquote ──────────────────────────────────────────────────────────── */
blockquote.pull {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--ember);
  font-family: var(--sans);
  font-weight: 500;
  font-size: 24px;
  line-height: 1.4;
  letter-spacing: var(--tr-snug);
  color: var(--ink);
  max-width: 42ch;
}
blockquote.pull cite {
  display: block;
  font-family: var(--mono);
  font-style: normal;
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 12px;
  font-weight: 400;
}

/* ── Prose (long-form reading) ──────────────────────────────────────────── */
.prose { max-width: var(--col-read); }
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--sans);
  font-weight: 540;
  font-size: var(--t-d3);
  letter-spacing: var(--tr-snug);
  line-height: 1.15;
  color: var(--ink);
  margin-top: 2em;
  scroll-margin-top: 80px;
}
.prose h3 {
  font-family: var(--sans);
  font-weight: 540;
  font-size: 20px;
  letter-spacing: var(--tr-snug);
  line-height: 1.25;
  color: var(--ink);
  margin-top: 1.6em;
}
.prose p { color: var(--ink-2); }
.prose a { color: var(--ink); border-bottom: 1px solid var(--rule-strong); padding-bottom: 1px; transition: border-color 120ms ease, color 120ms ease; }
.prose a:hover { color: var(--ember); border-color: var(--ember); }
.prose ul, .prose ol { padding-left: 22px; color: var(--ink-2); }
.prose ul li, .prose ol li { margin-top: 0.5em; }
.prose ul li::marker { color: var(--ember); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose em { font-style: italic; }

/* MDX-rendered constructs (bare elements, no authored classes) */
.prose :not(pre) > code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--paper-2);
  padding: 1px 6px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--ink);
  word-break: break-word;
}
.prose a code { color: inherit; }
.prose pre {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 20px 24px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
  letter-spacing: 0;
}
.prose pre code {
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: 0;
  padding: 0;
  border-radius: 0;
  color: inherit;
}
.prose blockquote {
  margin: 1.6em 0;
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--ember);
  color: var(--ink);
  font-size: 18px;
  line-height: 1.5;
}
.prose blockquote p { color: var(--ink); }
.prose blockquote > * + * { margin-top: 0.6em; }
.prose h4 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: var(--tr-snug);
  color: var(--ink);
  margin-top: 1.6em;
}
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.2em 0; }
.prose img { display: block; max-width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 2px; }
.prose figure { margin: 1.6em 0; }
.prose figcaption { font-family: var(--mono); font-size: 12px; color: var(--dim); margin-top: 8px; letter-spacing: 0.02em; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.45;
  margin: 1.6em 0;
  display: block;
  overflow-x: auto;
}
.prose table th, .prose table td {
  border: 1px solid var(--rule);
  padding: 9px 13px;
  text-align: left;
  vertical-align: top;
  color: var(--ink-2);
}
.prose table th {
  background: var(--paper-2);
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}
.prose table code { white-space: nowrap; }

/* ── Footer ─────────────────────────────────────────────────────────────── */
.site-foot {
  margin-top: var(--s-10);
  border-top: 1px solid var(--rule);
  padding: var(--s-7) 0 var(--s-9);
}
.site-foot-inner {
  max-width: var(--col-wide); margin: 0 auto; padding: 0 var(--page-pad-x);
  display: grid; grid-template-columns: 1.4fr 1.5fr 1fr;
  gap: 32px;
}
.site-foot h6 { font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: 0.06em; text-transform: uppercase; margin: 0 0 14px; font-weight: 500; }
.site-foot ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.site-foot-inner > div:nth-child(2) ul { display: grid; grid-auto-flow: column; grid-template-rows: repeat(3, auto); column-gap: 36px; row-gap: 8px; justify-content: start; }
.site-foot a { color: var(--ink-2); font-size: 14px; transition: color 120ms ease; }
.site-foot a:hover { color: var(--ember); }
.site-foot .meta { font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: 0.04em; line-height: 1.6; }
.site-foot .meta b { color: var(--ink); font-weight: 500; display: block; }
@media (max-width: 880px) {
  .site-foot-inner { grid-template-columns: 1fr 1fr; }
  .site-foot-inner > div:nth-child(2) ul { grid-auto-flow: row; grid-template-rows: none; }
}
@media (max-width: 520px) {
  .site-foot-inner { grid-template-columns: 1fr; }
}

/* ── Misc helpers ───────────────────────────────────────────────────────── */
.hr-thin { border: 0; border-top: 1px solid var(--rule); margin: 0; }
.hr-strong { border: 0; border-top: 1px solid var(--rule-strong); margin: 0; }
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--dim);
  border: 1px solid var(--rule); border-radius: 2px;
  padding: 4px 8px;
}
.tag .em { display: inline-block; width: 6px; height: 6px; background: var(--ember); border-radius: 50%; }

.badge-version {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
  color: var(--ember); padding: 2px 6px; border: 1px solid var(--ember);
  border-radius: 2px; background: var(--ember-bg);
}
html.theme-dark .badge-version { color: var(--ember); }

/* ── Launch callout (time-boxed band; removable without disturbing the rest) ─ */
.launch-callout {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
}
.launch-callout-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 32px;
  align-items: center;
  max-width: var(--col-wide);
  margin: 0 auto;
  padding: 14px var(--page-pad-x);
}
.launch-callout .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ember);
  display: inline-flex; align-items: center; gap: 10px;
  white-space: nowrap;
  border: 0; padding: 0; background: none; border-radius: 0;
}
.launch-callout .tag .dot {
  width: 6px; height: 6px;
  background: var(--ember); border-radius: 50%;
  display: inline-block;
}
.launch-callout .tag .date {
  color: var(--dim);
  letter-spacing: 0.04em;
}
.launch-callout .copy {
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.55;
}
.launch-callout .copy b { color: var(--ink); font-weight: 540; }
.launch-callout .copy .arr { color: var(--ember); margin: 0 8px; }
.launch-callout .copy .sub { color: var(--mid); }
.launch-callout a.link-inline {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ember);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  white-space: nowrap;
  transition: border-color 120ms ease;
}
.launch-callout a.link-inline:hover { border-bottom-color: var(--ember); }
@media (max-width: 880px) {
  .launch-callout-inner { grid-template-columns: 1fr; gap: 8px; padding: 16px var(--page-pad-x); }
  .launch-callout .copy { font-size: 14px; }
}

/* ── LOC-delta chart (stacked, monthly, multi-year) ─────────────────────── */
.chart-loc-wrap {
  position: relative;
  margin-top: 16px;
}
.chart-loc {
  display: grid;
  grid-template-columns: repeat(75, 1fr);
  gap: 1px;
  align-items: end;
  height: 340px;
  border-bottom: 1px solid var(--rule-strong);
  padding-top: 40px;
  position: relative;
}
.chart-loc .col {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  height: 100%;
  min-height: 1px;
  position: relative;
}
.chart-loc .col .seg {
  width: 100%;
  min-height: 0;
}
.chart-loc .col .seg-ai    { background: var(--ember); }
.chart-loc .col .seg-human { background: var(--dim); }
.chart-loc .col:hover .seg { background: var(--ink); }

.chart-loc-guides {
  position: absolute;
  inset: 0 0 0 0;
  pointer-events: none;
}
.chart-loc-guides .g {
  position: absolute;
  top: 36px; bottom: 0;
  width: 1px;
  background: var(--ember);
  opacity: 0.55;
}
.chart-loc-guides .g .badge {
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--ember);
  padding: 2px 6px;
  border-radius: 2px;
  line-height: 1;
  white-space: nowrap;
}

.chart-loc-axis {
  display: grid;
  grid-template-columns: 10fr 12fr 12fr 12fr 12fr 12fr 5fr;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 8px;
}
.chart-loc-axis span {
  border-left: 1px solid var(--rule);
  padding: 6px 0 0 6px;
}

.chart-loc-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 18px;
  flex-wrap: wrap;
  gap: 16px;
}
.chart-loc-meta .legend { display: inline-flex; align-items: center; gap: 18px; }
.chart-loc-meta .legend .item { display: inline-flex; align-items: center; gap: 8px; }
.chart-loc-meta .legend .sw { display: inline-block; width: 10px; height: 10px; border-radius: 1px; }
.chart-loc-meta .legend .sw-ai    { background: var(--ember); }
.chart-loc-meta .legend .sw-human { background: var(--dim); }

.chart-loc-callouts {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  border-top: 1px solid var(--rule);
  margin-top: 28px;
  padding-top: 20px;
}
.chart-loc-callouts .callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
}
.chart-loc-callouts .callout .badge {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--paper);
  background: var(--ember);
  padding: 2px 6px;
  border-radius: 2px;
  line-height: 1;
  white-space: nowrap;
}
.chart-loc-callouts .callout .body {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.5;
}
.chart-loc-callouts .callout .body b { color: var(--ink); font-weight: 540; }

@media (max-width: 760px) {
  .chart-loc { height: 220px; padding-top: 60px; }
  .chart-loc-callouts { grid-template-columns: 1fr; gap: 12px; }
}

/* ── Dual stat block (commits side-by-side with source-lines) ───────────── */
.stat-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule);
}
.stat-dual .side { border-right: 1px solid var(--rule); }
.stat-dual .side:last-child { border-right: 0; }
.stat-dual .side .side-head {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ember);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 14px 24px;
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
}
.stat-dual .side .rows { display: grid; grid-template-columns: 1fr 1fr; }
.stat-dual .side .rows .cell {
  padding: 22px 24px;
  border-right: 1px solid var(--rule);
}
.stat-dual .side .rows .cell:nth-child(2n) { border-right: 0; }
.stat-dual .side .rows .cell:nth-child(-n+2) { border-bottom: 1px solid var(--rule); }
.stat-dual .side .rows .cell .num {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 26px;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.stat-dual .side .rows .cell .num .unit { color: var(--ember); font-size: 13px; margin-left: 4px; }
.stat-dual .side .rows .cell .label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 10px;
  line-height: 1.4;
}
@media (max-width: 760px) {
  .stat-dual { grid-template-columns: 1fr; }
  .stat-dual .side { border-right: 0; border-bottom: 1px solid var(--rule); }
  .stat-dual .side:last-child { border-bottom: 0; }
}

/* ── Act header (three-act narrative) ───────────────────────────────────── */
.act {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 12px;
  align-items: baseline;
  margin: 0 0 20px;
}
.act .act-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ember);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding-top: 8px;
}
.act .act-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px 18px;
}
.act .act-title {
  font-family: var(--sans);
  font-size: 30px;
  font-weight: 540;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.act .act-span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.04em;
}
@media (max-width: 760px) {
  .act { grid-template-columns: 1fr; gap: 4px; }
  .act .act-title { font-size: 24px; }
}

/* ── Three doorways (landing /02 — quiet, equal weight) ─────────────────── */
.doorways {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
}
.doorway {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 14px;
  padding: 28px 28px 28px 26px;
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  border-left: 2px solid var(--ember);
  transition: background 120ms ease;
}
.doorway:last-child { border-right: 0; }
.doorway:hover { background: var(--paper-2); }
.doorway .dw-rule { display: none; }
.doorway .dw-kicker {
  font-family: var(--sans);
  font-weight: 540;
  font-size: 19px;
  letter-spacing: var(--tr-snug);
  color: var(--ink);
}
.doorway .dw-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--mid);
  max-width: 40ch;
}
.doorway .dw-link {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--rule-strong);
  justify-self: start;
  transition: border-color 120ms ease, color 120ms ease;
}
.doorway .dw-link .arrow { color: var(--ember); margin-left: 4px; }
.doorway:hover .dw-link { border-color: var(--ember); color: var(--ember); }
@media (max-width: 760px) {
  .doorways { grid-template-columns: 1fr; }
  .doorway { border-right: 0; }
}

/* ── Native theme-aware charts (practice page) ──────────────────────────── */
.chart-card {
  border: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 18px 22px 16px;
  margin-top: 20px;
  max-width: 760px;
}
.cx-svg { width: 100%; height: auto; display: block; overflow: visible; }
.cx-title { font: 600 18px var(--mono); fill: var(--ink); letter-spacing: -0.01em; }
.cx-axis { font: 400 12.5px var(--mono); fill: var(--dim); letter-spacing: 0.02em; }
.cx-axis-ember { fill: var(--ember); }
.cx-ylabel { font: 400 12.5px var(--mono); fill: var(--dim); letter-spacing: 0.04em; }
.cx-grid { stroke: var(--rule); stroke-width: 1; }
.cx-baseline { stroke: var(--rule-strong); stroke-width: 1; }
.cx-bar-ai { fill: var(--ember); }
.cx-bar-human { fill: var(--dim); }
.cx-line-ai { stroke: var(--ember); stroke-width: 2.5; fill: none; stroke-linejoin: round; stroke-linecap: round; }
.cx-line-neutral { stroke: var(--ink); stroke-width: 2.5; fill: none; stroke-linejoin: round; stroke-linecap: round; }
.cx-area-ai { fill: var(--ember); opacity: 0.13; }
.cx-dot-ai { fill: var(--ember); }
.cx-dot-neutral { fill: var(--ink); }
.cx-divider { stroke: var(--dim); stroke-width: 1; stroke-dasharray: 4 5; opacity: 0.7; }
.cx-band { font: 600 12.5px var(--mono); fill: var(--dim); letter-spacing: 0.06em; }
.cx-anno { font: 400 12.5px var(--mono); fill: var(--ink-2); letter-spacing: 0.01em; }
.cx-anno-line { stroke: var(--dim); stroke-width: 1; opacity: 0.8; }
.cx-legend { font: 400 13px var(--mono); fill: var(--ink-2); }
.cx-bar-ai, .cx-bar-human { transition: opacity 100ms ease; }
.cx-bar-ai:hover, .cx-bar-human:hover { opacity: 0.78; }
.cx-tip {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  background: var(--paper);
  color: var(--ink-2);
  border: 1px solid var(--rule-strong);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
  letter-spacing: 0.01em;
  padding: 8px 11px;
  border-radius: 2px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.22);
  max-width: 260px;
}
.cx-tip b { color: var(--ink); font-weight: 600; }
.cx-tip .t-ai { color: var(--ember); }
.cx-tip .t-hu { color: var(--dim); }

/* horizontal-bar value labels + ember gradient (asymmetry charts) */
.cx-vlabel-ai { font: 400 12.5px var(--mono); fill: var(--ember); }
.cx-vlabel-hu { font: 500 12.5px var(--mono); fill: var(--ink); }
.cx-grad-a { stop-color: var(--ember); stop-opacity: 0.32; }
.cx-grad-b { stop-color: var(--ember); stop-opacity: 1; }
.cx-bar-grad { transition: opacity 100ms ease; }
.cx-bar-grad:hover { opacity: 0.82; }

/* stat pair (Act I — replaces a chart) */
.stat-pair {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  border: 1px solid var(--rule);
  background: var(--paper-2);
  padding: 34px 28px;
  margin-top: 20px;
  max-width: 760px;
}
.stat-pair .sp-item { flex: 1 1 240px; }
.stat-pair .sp-num {
  display: block;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.stat-pair .sp-num.ember { color: var(--ember); }
.stat-pair .sp-label {
  display: block;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  max-width: 30ch;
}
.stat-pair .sp-div { font-family: var(--mono); font-size: 30px; color: var(--rule-strong); line-height: 1; }
@media (max-width: 560px) {
  .stat-pair .sp-div { display: none; }
}
.chart-cap {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--dim);
  letter-spacing: 0.01em;
  line-height: 1.5;
  margin: 12px 0 0;
  max-width: 760px;
}
.chart-cap .em { color: var(--ember); }

/* ── Large connective pull quote ────────────────────────────────────────── */
.pull.pull-lg {
  margin-left: var(--gutter);
  max-width: 26ch;
  font-size: clamp(30px, 3.6vw, 40px);
  line-height: 1.16;
  letter-spacing: var(--tr-tight);
}
.pull-foot {
  margin: 20px 0 0;
  margin-left: calc(var(--gutter) + 16px);
  max-width: 48ch;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--mid);
}
.pull-cta { margin-left: calc(var(--gutter) + 16px); }
@media (max-width: 760px) {
  .pull.pull-lg { margin-left: 24px; }
  .pull-foot { margin-left: 40px; }
  .pull-cta { margin-left: 40px; }
}

/* ── On-load fade (subtle, CSS-only) ────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  main { animation: fadeIn 260ms ease-out both; }
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(2px); }
  to   { opacity: 1; transform: none; }
}