/* ============================================================
   How Teams Build — AI usage patterns · interactive edition
   Dark-first design system; light theme via data-theme / system.
   ============================================================ */

/* ---------- fonts ---------- */
@font-face {
  font-family: "Newsreader";
  src: url("fonts/newsreader-opsz.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Newsreader";
  src: url("fonts/newsreader-opsz-italic.woff2") format("woff2");
  font-weight: 200 800;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("fonts/inter-opsz.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/plexmono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/plexmono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/plexmono-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

/* ---------- tokens ---------- */
:root {
  --bg: #0a0c10;
  --bg-raise: #10141b;
  --bg-sunk: #060709;
  --bg-chart: #0d1017;
  --ink: #e9ecf2;
  --ink-2: #a8b0bd;
  --ink-3: #79828f;
  --ink-faint: #757c8d;
  --line: #212836;
  --line-2: #2c3547;
  --accent: #8c9bff;
  --accent-deep: #5b6ef0;
  --accent-ink: #0a0c10;
  --human: #8a93a3;
  --grid: #1c2331;
  --acc-1: #8c9bff; /* engineering — indigo */
  --acc-2: #4fd1ad; /* product — teal */
  --acc-3: #f0b25c; /* founder — amber */
  --acc-4: #b98cff; /* design — violet */
  --acc-5: #f2849e; /* gtm — rose */
  --up: #63d6a4;
  --down: #f08d8d;
  --flat: #8a93a3;
  --tip-bg: #171c26;
  --shadow: 0 18px 50px -18px rgba(0, 0, 0, 0.55);
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --rail-w: 240px;
  --measure: 40rem;
  --mast-h: 52px;
  --ease: cubic-bezier(0.22, 0.9, 0.28, 1);
}
@media (prefers-color-scheme: light) {
  html:not([data-theme]) {
    --bg: #f6f5f1; --bg-raise: #ffffff; --bg-sunk: #eceae3; --bg-chart: #fbfaf7;
    --ink: #161922; --ink-2: #4b5262; --ink-3: #646b7a; --ink-faint: #697080;
    --line: #e2e0d6; --line-2: #d1cec0;
    --accent: #3f53d9; --accent-deep: #2f41b8; --accent-ink: #ffffff;
    --human: #6b7280; --grid: #e7e5db;
    --acc-1: #3f53d9; --acc-2: #0e8f6e; --acc-3: #b07817; --acc-4: #7c4ddb; --acc-5: #cf4a6c;
    --up: #0b7a5a; --down: #c9403c; --flat: #6b7280;
    --tip-bg: #ffffff;
    --shadow: 0 18px 50px -22px rgba(40, 40, 60, 0.28);
  }
}
html[data-theme="light"] {
  --bg: #f6f5f1; --bg-raise: #ffffff; --bg-sunk: #eceae3; --bg-chart: #fbfaf7;
  --ink: #161922; --ink-2: #4b5262; --ink-3: #646b7a; --ink-faint: #697080;
  --line: #e2e0d6; --line-2: #d1cec0;
  --accent: #3f53d9; --accent-deep: #2f41b8; --accent-ink: #ffffff;
  --human: #6b7280; --grid: #e7e5db;
  --acc-1: #3f53d9; --acc-2: #0e8f6e; --acc-3: #b07817; --acc-4: #7c4ddb; --acc-5: #cf4a6c;
  --up: #0b7a5a; --down: #c9403c; --flat: #6b7280;
  --tip-bg: #ffffff;
  --shadow: 0 18px 50px -22px rgba(40, 40, 60, 0.28);
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--mast-h) + 56px); overflow-x: clip; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
::selection { background: color-mix(in srgb, var(--accent) 32%, transparent); }
img, svg { max-width: 100%; }
a { color: var(--accent); text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }
h1, h2, h3 { margin: 0; }
p { margin: 0 0 1em; }
button { font: inherit; color: inherit; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  clip: rect(0 0 0 0); clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}
.skip {
  position: fixed; top: 10px; left: 10px; z-index: 100;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 8px; font-weight: 600; font-size: 14px;
  transform: translateY(-64px); transition: transform 0.18s var(--ease);
}
.skip:focus-visible { transform: none; outline-offset: 2px; }

/* grain overlay */
.grain, body::after {
  content: "";
  position: fixed; inset: 0; z-index: 60; pointer-events: none;
  background-image: url("grain.svg");
  opacity: 0.05; mix-blend-mode: overlay;
}
html[data-theme="light"] body::after { opacity: 0.06; mix-blend-mode: multiply; }

/* ---------- reading progress ---------- */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 90;
  background: transparent;
}
.progress span {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  transform-origin: 0 50%; transform: scaleX(0);
}

/* ---------- masthead ---------- */
.mast {
  position: fixed; top: 0; left: 0; right: 0; z-index: 80;
  height: var(--mast-h);
  display: flex; align-items: center; gap: 14px;
  padding: 0 clamp(16px, 4vw, 36px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--line);
}
.wordmark {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--ink); text-decoration: none;
  font-family: var(--serif); font-size: 19px; font-weight: 500; letter-spacing: 0.01em;
}
.wordmark em { font-style: italic; color: var(--accent); }
.wm-mark { display: inline-flex; align-items: flex-end; gap: 2.5px; height: 16px; }
.wm-mark i { width: 3.5px; border-radius: 2px; background: var(--accent); display: block; }
.wm-mark i:nth-child(1) { height: 6px; opacity: 0.55; }
.wm-mark i:nth-child(2) { height: 11px; opacity: 0.8; }
.wm-mark i:nth-child(3) { height: 16px; }
.edition-tag {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-3);
  border: 1px solid var(--line-2); border-radius: 999px; padding: 4px 10px;
  white-space: nowrap;
}
.mast-right { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.src-link {
  font-family: var(--mono); font-size: 11.5px; color: var(--ink-3);
  text-decoration: none;
}
.src-link:hover { color: var(--ink); }
.theme-btn {
  width: 40px; height: 40px; border-radius: 10px;
  border: 1px solid var(--line-2); background: transparent;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--ink-2);
}
.theme-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.theme-btn svg { width: 18px; height: 18px; }
.ic-moon { display: none; }
html[data-theme="light"] .ic-sun { display: none; }
html[data-theme="light"] .ic-moon { display: block; }
@media (prefers-color-scheme: light) {
  html:not([data-theme]) .ic-sun { display: none; }
  html:not([data-theme]) .ic-moon { display: block; }
}
html.no-js .theme-btn { display: none; }

/* ---------- section navigator ---------- */
#section-nav {
  position: fixed; z-index: 70; top: var(--mast-h); left: 0; bottom: 0;
  width: var(--rail-w);
  padding: 28px 18px 28px clamp(16px, 3vw, 30px);
  overflow-y: auto;
  border-right: 1px solid transparent;
}
.nav-title {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-faint); margin: 0 0 14px;
}
.nav-acts, .nav-acts ol, .nav-tail { list-style: none; margin: 0; padding: 0; }
.nav-act { margin-bottom: 18px; }
.nav-act-link {
  display: flex; align-items: baseline; gap: 8px;
  color: var(--ink-3); text-decoration: none;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 6px;
}
.nav-act-link:hover { color: var(--ink); }
.nav-roman { color: var(--accent); }
.nav-link {
  position: relative;
  display: flex; align-items: center; gap: 9px;
  min-height: 34px;
  padding: 5px 8px 5px 0;
  color: var(--ink-2); text-decoration: none; font-size: 13px; line-height: 1.25;
  border-radius: 6px;
}
.nav-link:hover { color: var(--ink); }
.nav-num {
  font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint);
  width: 18px; text-align: right; flex: none;
}
.nav-name { flex: 1; }
.nav-dot {
  width: 6px; height: 6px; border-radius: 50%;
  border: 1px solid var(--ink-faint); flex: none;
}
.nav-link.seen .nav-dot { background: var(--ink-faint); border-color: var(--ink-faint); }
.nav-link[aria-current="true"] { color: var(--ink); font-weight: 600; }
.nav-link[aria-current="true"] .nav-num { color: var(--accent); }
.nav-link[aria-current="true"] .nav-dot { background: var(--accent); border-color: var(--accent); }
.nav-link[aria-current="true"]::before {
  content: ""; position: absolute; left: -14px; top: 8px; bottom: 8px;
  width: 2.5px; border-radius: 2px; background: var(--accent);
}
.nav-tail { border-top: 1px solid var(--line); padding-top: 14px; }

/* ---------- layout ---------- */
main { position: relative; z-index: 1; }
.hero, .act-head, .dataset, .closing, .appendix, .foot {
  padding-left: clamp(20px, 5vw, 40px);
  padding-right: clamp(20px, 5vw, 40px);
}
@media (min-width: 1180px) {
  .hero, .act-head, .dataset, .closing, .appendix, .foot {
    padding-left: calc(var(--rail-w) + clamp(28px, 4vw, 72px));
    padding-right: clamp(28px, 6vw, 110px);
  }
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  overflow-x: clip;
  padding-top: calc(var(--mast-h) + clamp(56px, 10vh, 120px));
  padding-bottom: clamp(40px, 7vh, 90px);
  max-width: 1080px;
}
.hero-glow {
  position: absolute; inset: -10% -30% auto -30%; height: 560px; z-index: -1;
  background:
    radial-gradient(52% 46% at 30% 30%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 70%),
    radial-gradient(40% 40% at 78% 18%, color-mix(in srgb, var(--acc-2) 9%, transparent), transparent 70%);
}
.hero-kicker {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 22px;
}
.hero h1 {
  font-family: var(--serif); font-weight: 420;
  font-size: clamp(42px, 7.4vw, 92px);
  line-height: 0.98; letter-spacing: -0.015em;
  font-variation-settings: "opsz" 144;
  margin-bottom: 30px;
  text-wrap: balance;
}
.hero-stand { max-width: var(--measure); }
.hero-stand p { font-size: clamp(16.5px, 1.6vw, 19px); color: var(--ink-2); }
.hero-stand strong { color: var(--ink); font-weight: 600; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 26px 0 8px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; color: var(--ink-3);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta span::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); opacity: 0.7; }
.digitstrip {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.32em;
  color: var(--ink-faint); margin: 20px 0 40px; white-space: nowrap; overflow: hidden;
}
.digitstrip span { display: inline-block; }
.nine-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 10px; margin-top: 34px; max-width: 880px;
}
.tile {
  position: relative; display: flex; flex-direction: column; gap: 8px;
  padding: 14px 14px 12px;
  background: var(--bg-raise); border: 1px solid var(--line); border-radius: 12px;
  color: var(--ink-2); text-decoration: none;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.tile:hover, .tile:focus-visible {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: color-mix(in srgb, var(--bg-raise) 70%, var(--accent) 8%);
  color: var(--ink);
}
.tile-top { display: flex; align-items: baseline; gap: 8px; }
.tile-num { font-family: var(--mono); font-size: 10.5px; color: var(--accent); }
.tile-name { font-size: 12.5px; font-weight: 550; letter-spacing: 0.01em; }
.tile .spark { width: 100%; height: 44px; }
.spark-line { stroke: var(--accent); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.spark-area { fill: color-mix(in srgb, var(--accent) 16%, transparent); }
.spark-zero { stroke: var(--ink-faint); stroke-width: 0.8; stroke-dasharray: 2 3; }
.spark-conn { stroke: var(--ink-3); stroke-width: 1.4; }
.spark-dot-a { fill: var(--bg-raise); stroke: var(--ink-3); stroke-width: 1.4; }
.spark-dot-b { fill: var(--accent); }
.tile-go {
  position: absolute; right: 12px; bottom: 10px;
  font-size: 14px; color: var(--accent); opacity: 0;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  transform: translateX(-4px);
}
.tile:hover .tile-go, .tile:focus-visible .tile-go { opacity: 1; transform: none; }
.hero-cue {
  margin-top: 44px; font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3);
}
.hero-cue span { color: var(--accent); }

/* ---------- act heads ---------- */
.act-head {
  display: flex; gap: clamp(18px, 3vw, 34px); align-items: flex-start;
  max-width: 1080px;
  margin-top: clamp(70px, 12vh, 140px);
  padding-top: clamp(34px, 6vh, 60px);
  border-top: 1px solid var(--line);
}
.act-roman {
  font-family: var(--serif); font-style: italic; font-weight: 300;
  font-size: clamp(56px, 8vw, 110px); line-height: 0.9;
  color: color-mix(in srgb, var(--accent) 80%, var(--ink));
  flex: none; margin-top: 4px;
}
.act-kicker {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px;
}
.act-title {
  font-family: var(--serif); font-weight: 460; font-size: clamp(30px, 4.4vw, 52px);
  letter-spacing: -0.01em; line-height: 1.05;
}
.act-sub { color: var(--ink-2); max-width: 34rem; margin-top: 10px; font-size: 16px; }

/* ---------- dataset ---------- */
.dataset {
  max-width: 1080px;
  margin-top: clamp(64px, 10vh, 120px);
  scroll-margin-top: calc(var(--mast-h) + 70px);
}
.ds-head {
  display: flex; gap: clamp(14px, 2.4vw, 26px); align-items: flex-start;
  margin-bottom: 18px;
}
.ds-num {
  font-family: var(--mono); font-weight: 500; font-size: clamp(13px, 1.4vw, 15px);
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--line));
  border-radius: 8px; padding: 5px 9px; margin-top: 7px; flex: none;
}
.ds-act {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px;
}
.ds-title {
  font-family: var(--serif); font-weight: 480;
  font-size: clamp(26px, 3.6vw, 40px); line-height: 1.08; letter-spacing: -0.01em;
  text-wrap: balance;
}
.prose { max-width: var(--measure); margin: 14px 0 26px; }
.prose p { color: var(--ink-2); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose em { color: var(--ink); }

/* ---------- chart block ---------- */
.chart-block {
  margin: 26px 0 34px;
  background: var(--bg-chart);
  border: 1px solid var(--line); border-radius: 16px;
  padding: clamp(16px, 2.6vw, 26px) clamp(14px, 2.6vw, 26px) clamp(12px, 2vw, 20px);
  box-shadow: var(--shadow);
  position: relative;
  max-width: 780px;
}
.chart-cap { margin-bottom: 14px; }
.chart-title { font-weight: 620; font-size: 15.5px; letter-spacing: 0.005em; margin: 0; }
.chart-sub { color: var(--ink-3); font-size: 12.5px; margin: 4px 0 0; }
.chart-frame {
  position: relative; border-radius: 8px;
}
.chart-frame:focus-visible { outline-offset: 5px; }
.chart-frame:focus-visible::after {
  content: "← → ↑ ↓ read values";
  position: absolute; top: 6px; right: 8px;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.08em;
  color: var(--accent); background: color-mix(in srgb, var(--bg-chart) 80%, transparent);
  padding: 3px 7px; border-radius: 5px; border: 1px solid var(--line-2);
  pointer-events: none;
}
.chart { display: block; width: 100%; height: auto; overflow: visible; }

/* svg text classes */
.chart text { font-family: var(--mono); }
.tick { font-size: 10.5px; fill: var(--ink-3); }
.tick.y { }
.grid { stroke: var(--grid); stroke-width: 1; }
.grid.zero { stroke: var(--ink-3); stroke-width: 1.3; }
.axis { stroke: var(--line-2); stroke-width: 1; }
.colhead { font-size: 10px; letter-spacing: 0.1em; fill: var(--ink-3); text-transform: uppercase; }
.colhead.solid-h { fill: var(--accent); }
.grouphead { font-size: 10.5px; letter-spacing: 0.14em; fill: var(--ink-2); text-transform: uppercase; font-weight: 600; }
.groupline { stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 4; }
.rowlab { font-size: 11.5px; fill: var(--ink-2); }
.rowsub { font-size: 9.5px; fill: var(--ink-faint); letter-spacing: 0.06em; }
.panelhead { font-size: 11px; letter-spacing: 0.1em; fill: var(--ink-2); text-transform: uppercase; font-weight: 600; }
.vlab { font-size: 10px; fill: var(--ink-3); }
.vlab.strong { fill: var(--ink); font-weight: 600; }
.delta { font-size: 11px; font-weight: 600; }
.delta.pos { fill: var(--up); }
.delta.neg { fill: var(--down); }
.delta.zero { fill: var(--flat); }
.endlab { font-size: 10.5px; fill: var(--ink-2); font-weight: 600; letter-spacing: 0.02em; }
.endval { font-size: 12.5px; fill: var(--ink); font-weight: 600; }
.annot-text { font-size: 10.5px; fill: var(--ink-2); }
.annot-line { stroke: var(--ink-faint); stroke-width: 1; stroke-dasharray: 2 3; }
.annot-dot { fill: var(--ink-3); }

/* svg elements */
.dot { transition: opacity 0.25s var(--ease); }
.dot-a { fill: var(--bg-chart); stroke: var(--ink-3); stroke-width: 1.8; }
.dot-m { fill: var(--bg-chart); stroke: var(--ink-2); stroke-width: 1.8; }
.dot-b { fill: var(--accent); stroke: color-mix(in srgb, var(--accent) 60%, var(--bg)); stroke-width: 1; }
.db-line { stroke: var(--line-2); stroke-width: 2.4; fill: none; stroke-linecap: round; }
.db-row.hl .dot-b { stroke: var(--accent); stroke-width: 2; }
.db-row.hl .rowlab { fill: var(--ink); font-weight: 600; }
.db-row.acc-1 .dot-b { fill: var(--acc-1); } .db-row.acc-2 .dot-b { fill: var(--acc-2); }
.db-row.acc-3 .dot-b { fill: var(--acc-3); } .db-row.acc-4 .dot-b { fill: var(--acc-4); }
.db-row.acc-5 .dot-b { fill: var(--acc-5); }
.db-row.acc-1 .db-line { stroke: color-mix(in srgb, var(--acc-1) 45%, var(--line-2)); }
.db-row.acc-2 .db-line { stroke: color-mix(in srgb, var(--acc-2) 45%, var(--line-2)); }
.db-row.acc-3 .db-line { stroke: color-mix(in srgb, var(--acc-3) 45%, var(--line-2)); }
.db-row.acc-4 .db-line { stroke: color-mix(in srgb, var(--acc-4) 45%, var(--line-2)); }
.db-row.acc-5 .db-line { stroke: color-mix(in srgb, var(--acc-5) 45%, var(--line-2)); }
.bar { transition: opacity 0.25s var(--ease); }
.bar-a { fill: color-mix(in srgb, var(--human) 55%, transparent); }
.bar-b { fill: var(--accent); }
.gb-row.acc-1 .bar-b { fill: var(--acc-1); } .gb-row.acc-2 .bar-b { fill: var(--acc-2); }
.gb-row.acc-3 .bar-b { fill: var(--acc-3); } .gb-row.acc-4 .bar-b { fill: var(--acc-4); }
.gb-row.acc-5 .bar-b { fill: var(--acc-5); }
.line { stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; transition: opacity 0.3s var(--ease); }
.line.s-ai { stroke: var(--accent); }
.line.s-people { stroke: var(--human); }
.area { transition: opacity 0.4s var(--ease); }
.area.s-ai { fill: color-mix(in srgb, var(--accent) 14%, transparent); }
.area.s-people { fill: color-mix(in srgb, var(--human) 10%, transparent); }
.gapband { fill: color-mix(in srgb, var(--accent) 9%, transparent); }
.enddot { transition: opacity 0.25s var(--ease); }
.enddot.s-ai { fill: var(--accent); }
.enddot.s-people { fill: var(--human); }
.pt.ghost { fill: transparent; stroke: none; }
.cursor-ring { fill: none; stroke: var(--accent); stroke-width: 2; }
.cursor-line { stroke: var(--ink-faint); stroke-width: 1; stroke-dasharray: 3 3; }
.dim { opacity: 0.12 !important; }
.off { opacity: 0 !important; pointer-events: none !important; }
.hitlayer { cursor: crosshair; }

/* draw-in animation (JS + no-reduced-motion only) */
.js .chart-block .draw, .js .chart-block .fade, .js .chart-block .grow-x,
.js .chart-block .dot, .js .chart-block .vlab, .js .chart-block .delta,
.js .chart-block .endlab, .js .chart-block .endval, .js .chart-block .enddot { }
@media (prefers-reduced-motion: no-preference) {
  .js .chart-block:not(.revealed) .draw { stroke-dasharray: 1000; stroke-dashoffset: 1000; }
  .js .chart-block.revealed .draw { stroke-dasharray: 1000; stroke-dashoffset: 0; transition: stroke-dashoffset 1.5s var(--ease) 0.15s; }
  .js .chart-block:not(.revealed) .fade { opacity: 0; }
  .js .chart-block.revealed .fade { opacity: 1; transition: opacity 0.9s var(--ease) 0.5s; }
  .js .chart-block:not(.revealed) .grow-x { transform: scaleX(0); }
  .js .chart-block .grow-x { transform-box: fill-box; transform-origin: 0 50%; }
  .js .chart-block.revealed .grow-x { transform: scaleX(1); transition: transform 0.8s var(--ease); }
  .js .chart-block:not(.revealed) .dot { opacity: 0; }
  .js .chart-block.revealed .dot { opacity: 1; transition: opacity 0.5s var(--ease) 0.35s; }
  .js .chart-block:not(.revealed) .vlab, .js .chart-block:not(.revealed) .delta,
  .js .chart-block:not(.revealed) .endlab, .js .chart-block:not(.revealed) .endval,
  .js .chart-block:not(.revealed) .enddot { opacity: 0; }
  .js .chart-block.revealed .vlab, .js .chart-block.revealed .delta,
  .js .chart-block.revealed .endlab, .js .chart-block.revealed .endval,
  .js .chart-block.revealed .enddot { opacity: 1; transition: opacity 0.6s var(--ease) 0.7s; }
  .js .chart-block.revealed .off { transition: none; }
}

/* ---------- legend ---------- */
.legend { display: flex; flex-wrap: wrap; gap: 8px 14px; margin: 12px 0 2px; }
.lg-item {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 36px; padding: 5px 12px 5px 9px;
  background: transparent; border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink-2); font-size: 12.5px; cursor: pointer;
  transition: border-color 0.2s, color 0.2s, opacity 0.2s;
}
.lg-item:hover { border-color: var(--ink-3); color: var(--ink); }
.lg-item[aria-pressed="false"] { opacity: 0.45; }
.sw { width: 16px; height: 12px; position: relative; flex: none; }
.sw-hollow::after { content: ""; position: absolute; inset: 2px 4px; border-radius: 50%; border: 1.8px solid var(--ink-3); }
.sw-solid::after { content: ""; position: absolute; inset: 2px 4px; border-radius: 50%; background: var(--accent); }
.sw-mid::after { content: ""; position: absolute; inset: 2px 4px; border-radius: 50%; background: linear-gradient(90deg, var(--ink-3) 50%, var(--accent) 50%); }
.sw-bar-a::after { content: ""; position: absolute; inset: 2px 1px; border-radius: 2px; background: color-mix(in srgb, var(--human) 55%, transparent); }
.sw-bar-b::after { content: ""; position: absolute; inset: 2px 1px; border-radius: 2px; background: var(--accent); }
.sw-ai::after { content: ""; position: absolute; left: 0; right: 0; top: 5px; height: 2.4px; border-radius: 2px; background: var(--accent); }
.sw-people::after { content: ""; position: absolute; left: 0; right: 0; top: 5px; height: 2.4px; border-radius: 2px; background: var(--human); }
.sw-people.sw-dash::after { background: repeating-linear-gradient(90deg, var(--human) 0 4px, transparent 4px 7px); }

/* ---------- chart note / details / table ---------- */
.chart-note {
  display: flex; flex-wrap: wrap; gap: 4px 14px; justify-content: space-between;
  font-size: 11.5px; color: var(--ink-3); margin: 12px 0 0;
}
.credit { font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-faint); }
.empty {
  margin: 14px 0 0; padding: 14px 16px; text-align: center;
  border: 1px dashed var(--line-2); border-radius: 10px;
  color: var(--ink-3); font-size: 13px;
}
.tip {
  position: absolute; z-index: 20; pointer-events: none;
  background: var(--tip-bg); border: 1px solid var(--line-2); border-radius: 10px;
  padding: 9px 12px; font-size: 12px; line-height: 1.5;
  box-shadow: var(--shadow); min-width: 130px; max-width: 240px;
}
.tip .tip-t { font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); display: block; margin-bottom: 4px; }
.tip .tip-row { display: flex; align-items: center; gap: 7px; }
.tip .tip-row .swv { width: 8px; height: 8px; border-radius: 2px; flex: none; }
.tip .tip-row b { margin-left: auto; font-family: var(--mono); font-weight: 600; padding-left: 10px; }
.tip .tip-share { margin-top: 5px; padding-top: 5px; border-top: 1px solid var(--line); color: var(--accent); font-family: var(--mono); font-size: 11px; }
details.data, .app-details {
  margin-top: 12px; border-top: 1px solid var(--line);
}
details.data summary, .app-details summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: 9px;
  min-height: 44px; padding: 10px 2px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-3);
}
details.data summary:hover, .app-details summary:hover { color: var(--ink); }
details.data summary::-webkit-details-marker, .app-details summary::-webkit-details-marker { display: none; }
.sum-ic { width: 14px; height: 14px; position: relative; flex: none; }
.sum-ic::before, .sum-ic::after {
  content: ""; position: absolute; background: currentColor; border-radius: 1px;
}
.sum-ic::before { left: 0; right: 0; top: 6px; height: 1.6px; }
.sum-ic::after { top: 0; bottom: 0; left: 6px; width: 1.6px; transition: transform 0.2s var(--ease); }
details[open] > summary .sum-ic::after { transform: scaleY(0); }
.data-body { padding: 4px 0 18px; }
.data-body p { font-size: 13px; color: var(--ink-3); max-width: var(--measure); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; margin-top: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 12.5px; }
caption {
  text-align: left; padding: 10px 12px; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3);
  border-bottom: 1px solid var(--line);
}
th, td { padding: 7px 12px; text-align: left; white-space: nowrap; }
thead th {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 500; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: var(--bg-chart);
}
tbody th { font-weight: 500; color: var(--ink-2); font-family: var(--mono); font-size: 11.5px; }
tbody td { font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); }
tbody tr:nth-child(even) { background: color-mix(in srgb, var(--ink) 3%, transparent); }
tbody tr:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }

/* ---------- statband ---------- */
.statband {
  display: flex; align-items: baseline; gap: clamp(16px, 3vw, 34px);
  margin: 30px 0 8px; padding: clamp(18px, 3vw, 28px) 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  max-width: 780px;
}
.stat-num {
  font-family: var(--serif); font-weight: 380;
  font-size: clamp(44px, 7vw, 84px); line-height: 0.95; letter-spacing: -0.02em;
  color: var(--accent); flex: none; font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.stat-text { color: var(--ink-2); font-size: clamp(13.5px, 1.5vw, 16px); max-width: 26rem; }
.stat-text strong { color: var(--ink); }

/* ---------- closing ---------- */
.closing {
  max-width: 1080px; margin-top: clamp(80px, 14vh, 160px);
  padding-top: clamp(34px, 6vh, 60px); border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--mast-h) + 40px);
}
.closing-kicker {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px;
}
.closing h2, .appendix h2 {
  font-family: var(--serif); font-weight: 460;
  font-size: clamp(28px, 4vw, 46px); letter-spacing: -0.01em; margin-bottom: 26px;
}
.closing-body { max-width: 38rem; }
.closing-body p { color: var(--ink-2); font-size: 16.5px; }
.closing-body .lede::first-letter {
  font-family: var(--serif); font-size: 3.4em; line-height: 0.85;
  float: left; padding: 4px 10px 0 0; color: var(--accent); font-weight: 480;
}
.pull {
  margin: 30px 0; padding: 4px 0 4px 22px;
  border-left: 2.5px solid var(--accent);
}
.pull p {
  font-family: var(--serif); font-style: italic; font-weight: 420;
  font-size: clamp(19px, 2.4vw, 25px); line-height: 1.35; color: var(--ink);
  margin: 0;
}
.sig {
  margin-top: 34px; font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em;
  color: var(--ink); text-transform: uppercase;
}
.sig span { color: var(--ink-3); text-transform: none; letter-spacing: 0.02em; }

/* ---------- appendix ---------- */
.appendix {
  max-width: 1080px; margin-top: clamp(70px, 12vh, 130px);
  padding-top: clamp(34px, 6vh, 60px); border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--mast-h) + 40px);
  padding-bottom: 40px;
}
.app-details { max-width: 780px; }
.def-list { margin: 0; padding: 4px 0 18px; }
.def-list > div {
  display: grid; grid-template-columns: 150px 1fr; gap: 8px 18px;
  padding: 12px 0; border-bottom: 1px solid var(--line);
}
.def-list dt { font-family: var(--mono); font-size: 12px; font-weight: 600; color: var(--accent); letter-spacing: 0.04em; }
.def-list dd { margin: 0; color: var(--ink-2); font-size: 14px; }

/* ---------- footer ---------- */
.foot {
  margin-top: clamp(60px, 10vh, 110px);
  border-top: 1px solid var(--line);
  padding-top: 40px; padding-bottom: 60px;
}
.foot-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 26px clamp(26px, 4vw, 60px); max-width: 1000px;
}
.foot-h {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px;
}
.foot-col p:not(.foot-h) { font-size: 13px; color: var(--ink-3); }
.foot-col code { font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); }
.foot-fine {
  margin-top: 36px; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.06em; color: var(--ink-faint);
}

/* ---------- responsive ---------- */
@media (max-width: 1179px) {
  :root { --mast-h: 50px; }
  #section-nav {
    position: sticky; top: var(--mast-h); bottom: auto;
    width: 100%; padding: 0;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    z-index: 65;
  }
  .nav-inner {
    display: flex; align-items: center; gap: 14px;
    padding: 8px clamp(14px, 4vw, 28px);
    overflow-x: auto; scrollbar-width: none;
  }
  .nav-inner::-webkit-scrollbar { display: none; }
  .nav-title { margin: 0; flex: none; }
  .nav-acts { display: flex; gap: 18px; align-items: center; }
  .nav-act { display: flex; align-items: center; gap: 8px; margin: 0; }
  .nav-act ol { display: flex; gap: 4px; }
  .nav-act-link .nav-act-name { display: none; }
  .nav-act-link { margin: 0; padding: 6px 2px; min-height: 40px; display: inline-flex; align-items: center; }
  .nav-link { padding: 6px 8px; min-height: 40px; white-space: nowrap; }
  .nav-link .nav-name { display: none; }
  .nav-link .nav-num { width: auto; font-size: 11px; }
  .nav-link .nav-dot { display: none; }
  .nav-link[aria-current="true"] { background: color-mix(in srgb, var(--accent) 14%, transparent); }
  .nav-link[aria-current="true"]::before { display: none; }
  .nav-tail { display: flex; gap: 4px; border-top: 0; padding-top: 0; margin-left: 4px; }
  .nav-tail .nav-link { border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; }
  .nav-tail .nav-num { display: none; }
  .nav-tail .nav-name { display: inline; font-size: 12px; }
  .dataset { scroll-margin-top: calc(var(--mast-h) + 64px); }
}
@media (max-width: 640px) {
  .nine-grid { grid-template-columns: repeat(2, 1fr); }
  .statband { flex-direction: column; gap: 8px; align-items: flex-start; }
  .stat-num { font-size: clamp(40px, 13vw, 60px); }
  .act-head { flex-direction: column; gap: 8px; }
  .act-roman { font-size: 44px; }
  .src-link { display: none; }
  .def-list > div { grid-template-columns: 1fr; gap: 2px; }
  .hero h1 { font-size: clamp(40px, 12.5vw, 60px); }
  .edition-tag { display: none; }
  .chart-block { margin-left: -4px; margin-right: -4px; }
}
@media (max-width: 380px) {
  .nine-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .tile-name { font-size: 11.5px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }
  html { scroll-behavior: auto; }
}
html.reduced .digitstrip span { letter-spacing: 0.32em; }

/* ---------- forced colors ---------- */
@media (forced-colors: active) {
  .progress span { background: Highlight; }
  .tile, .chart-block, .lg-item, .theme-btn { border-color: ButtonBorder; }
  .dot-b, .bar-b, .spark-dot-b { fill: Highlight; }
  .line.s-ai { stroke: Highlight; }
  .nav-link[aria-current="true"] { outline: 1px solid Highlight; }
}

/* ---------- print ---------- */
@media print {
  :root { --bg: #fff; --bg-chart: #fff; --bg-raise: #fff; --ink: #111; --ink-2: #333; --ink-3: #666; --line: #ddd; --line-2: #ccc; --grid: #eee; --accent: #2f41b8; }
  .mast, #section-nav, .progress, .skip, .hero-cue, .tile-go, body::after { display: none !important; }
  .hero { padding-top: 0; }
  .chart-block { box-shadow: none; break-inside: avoid; }
  .dataset, .closing, .appendix { margin-top: 40px; }
  .tip, .sr-live { display: none; }
}