:root {
  /* The field guide's palette and type (site/theme.css), mapped onto the
     names this runtime and the talk pages already use. */
  color-scheme: dark;
  --ink: #f2f1e8;
  --paper: #17231b;
  --deep: #101712;
  --panel: #1e2c22;
  --raised: #24352a;
  --card: #2b3f31;
  --muted: #b9bcae;
  --rule: rgba(242, 241, 232, 0.16);
  --rule-strong: rgba(242, 241, 232, 0.38);
  --accent: #f4cf72;
  --accent-soft: #3a3a24;
  --identity: #a9d18f;
  --machine: #8fb8d8;
  --display: "Barlow Condensed", "Arial Narrow", "Helvetica Neue Condensed", system-ui, sans-serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { box-sizing: border-box; }
html { background: var(--paper); scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--machine); }

.talk-masthead {
  max-width: 84rem;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 1.5rem;
}
.talk-kicker {
  font: 600 .7rem/1.3 var(--sans);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}
.talk-masthead h1 {
  font-family: var(--display);
  text-transform: uppercase;
  font-weight: 600;
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  line-height: .96;
  letter-spacing: .02em;
  margin: .8rem 0 .7rem;
  max-width: 26ch;
}
.talk-masthead .dek {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 44rem;
  margin: 0;
}
.talk-meta {
  font: .8rem/1.6 var(--sans);
  color: var(--muted);
  margin-top: .9rem;
}
.talk-controls { margin-top: .8rem; }
.talk-controls button {
  font: 600 .74rem/1 var(--sans);
  padding: .5rem .7rem;
  border: 1px solid var(--rule);
  background: var(--raised);
  color: var(--ink);
  border-radius: .25rem;
  cursor: pointer;
}
.talk-controls button:hover { background: var(--accent-soft); }

.talk-layout {
  display: grid;
  grid-template-columns: minmax(0, 42fr) minmax(0, 58fr);
  gap: 3rem;
  max-width: 84rem;
  margin: 0 auto;
  padding: 1rem 1.5rem 7rem;
  align-items: start;
}
.talk-layout[data-talk-collapsed] { grid-template-columns: 1fr; }
.talk-layout[data-talk-collapsed] .talk-rail { display: none; }
.talk-layout[data-talk-collapsed] .talk-copy { max-width: 46rem; margin: 0 auto; }

.talk-rail {
  position: sticky;
  top: 1rem;
  min-width: 0;
}
.talk-visuals {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: .4rem;
  overflow: hidden;
}
.talk-visual {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: .8rem;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .45s ease, transform .45s ease;
  pointer-events: none;
}
.talk-visual.is-active { opacity: 1; transform: none; pointer-events: auto; }
.talk-visual img { width: 100%; height: 100%; object-fit: contain; }
.talk-visual figcaption {
  font: .72rem/1.45 var(--sans);
  color: var(--muted);
  text-align: right;
}
.talk-rail-caption {
  min-height: 1.4em;
  margin: .6rem 0 0;
  font: .74rem/1.4 var(--sans);
  color: var(--muted);
}
.talk-rail-progress {
  height: 2px;
  background: var(--rule);
  margin-top: .6rem;
  position: relative;
}
.talk-rail-progress span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: var(--accent);
  transition: width .3s ease;
}

/* Card types */
.quote-card {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.1vw, 1.7rem);
  line-height: 1.3;
  letter-spacing: -.01em;
}
.quote-card::before {
  content: "“";
  display: block;
  color: var(--accent);
  font-size: 3.4rem;
  line-height: .6;
  margin-bottom: .4rem;
}
.quote-card cite {
  display: block;
  margin-top: .9rem;
  font: .74rem/1.5 var(--sans);
  color: var(--muted);
  font-style: normal;
}
.diagram-card svg { width: 100%; height: auto; }
.diagram-card .diagram-label {
  font: .68rem/1.3 var(--sans);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.photo-card img { flex: 1 1 0; min-height: 0; width: 100%; height: auto; object-fit: contain; border-radius: .25rem; }
.video-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: .7rem;
  background: var(--deep);
  color: var(--paper);
}
.video-card a {
  color: var(--paper);
  font: 600 .85rem/1.3 var(--sans);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  align-self: flex-start;
}
.video-card .time {
  font: .8rem/1.4 var(--mono, ui-monospace, monospace);
  color: var(--muted);
}

.talk-copy { min-width: 0; max-width: 46rem; }
.talk-copy section {
  min-height: 78vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1rem 0;
  scroll-margin-top: 2rem;
}
.talk-copy section:first-child { padding-top: 2rem; min-height: 0; justify-content: flex-start; }
.talk-copy .chapter {
  font: 600 .68rem/1.3 var(--sans);
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
}
.talk-copy h2 {
  font-family: var(--display);
  text-transform: uppercase;
  font-weight: 600;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  line-height: 1.06;
  letter-spacing: .025em;
  margin: .5rem 0 1rem;
}
.talk-copy p { font-size: 1.06rem; margin: 0 0 1rem; }
.talk-copy blockquote {
  margin: 1.4rem 0;
  padding: .1rem 0 .1rem 1.1rem;
  border-left: 3px solid var(--accent);
  font-size: 1.15rem;
  font-style: italic;
}
.talk-copy blockquote .cite {
  display: block;
  margin-top: .4rem;
  font: .74rem/1.4 var(--sans);
  color: var(--muted);
  font-style: normal;
}
.talk-copy .key-points {
  margin: 1rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--rule);
  list-style: none;
}
.talk-copy .key-points li {
  position: relative;
  padding-left: 1.2rem;
  margin: .45rem 0;
  font: .92rem/1.5 var(--sans);
}
.talk-copy .key-points li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}
.talk-copy .watch {
  margin-top: 1rem;
  font: .78rem/1.5 var(--sans);
  color: var(--muted);
}
.talk-copy .watch a { color: var(--machine); }
.talk-foot {
  max-width: 84rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  font: .78rem/1.6 var(--sans);
  color: var(--muted);
}

/* Mid widths (700–980px): keep the story layout, just a narrower pair of columns. */
@media (max-width: 980px) {
  .talk-layout { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.6rem; padding-inline: 1rem; }
}

/* Phones (under 700px): no sticky rail. The runtime places each chapter's visual
   directly above that chapter's text, so picture and paragraph stay together. */
@media (max-width: 700px) {
  .talk-layout { grid-template-columns: 1fr; gap: 0; }
  .talk-rail { display: none; }
  .talk-copy section, .talk-copy section:first-child { min-height: 0; padding: 1.4rem 0 2rem; opacity: 1; }
  .inline-visual {
    position: static; opacity: 1; transform: none; pointer-events: auto;
    display: flex; flex-direction: column; gap: .6rem;
    margin: 0 0 1.2rem; padding: .9rem;
    background: var(--panel); border: 1px solid var(--rule); border-top: 2px solid var(--accent); border-radius: .4rem;
  }
  .inline-visual img { width: 100%; height: auto; }
}
@media (min-width: 701px) { .inline-visual { display: none; } }

@media (max-width: 620px) {
  .talk-masthead { padding-top: 2.5rem; }
  .talk-visual { padding: .9rem; min-height: 12rem; }
  .talk-visual figcaption { text-align: left; }
}

@media print {
  @page { margin: 16mm; }
  .talk-masthead { padding: 0 0 1rem; max-width: none; }
  .talk-layout { display: block; max-width: none; padding: 0; }
  .talk-rail { position: static; }
  .talk-visuals { aspect-ratio: auto; border: 0; background: transparent; overflow: visible; }
  .talk-visual {
    position: static; opacity: 1; transform: none; display: block;
    break-inside: avoid; padding: 0 0 1rem; min-height: 0;
  }
  .talk-controls, .talk-rail-caption, .talk-rail-progress { display: none; }
  .talk-copy section { min-height: 0; break-inside: avoid; }
  .talk-copy section h2 { break-after: avoid; }
}

/* Guide accents: mono kickers, serif quotes, yellow rule on the rail. */
.talk-kicker, .talk-copy .chapter, .diagram-card .diagram-label { font-family: var(--mono); font-weight: 700; color: var(--muted); }
.talk-copy .chapter { color: var(--accent); }
.talk-masthead .dek { font-family: var(--serif); font-style: italic; }
.talk-copy blockquote { font-family: var(--serif); border-left-color: var(--accent); }
.talk-visuals { border-top: 2px solid var(--accent); }

/* Scrollytelling: the rail fills the viewport beside the text, the chapter in
   view is at full strength, and the others recede so one beat reads at a time. */
@media (min-width: 701px) {
  .talk-rail { top: 2.75rem; height: calc(100vh - 2.75rem); display: flex; flex-direction: column; justify-content: center; }
  .talk-visuals {
    aspect-ratio: 16 / 10.5;
    height: auto;
    max-height: calc(100vh - 9.5rem);
    background: radial-gradient(circle at 50% 0%, rgba(244, 207, 114, 0.05), transparent 70%), var(--panel);
    border: 1px solid var(--rule-strong);
    border-top: 2px solid var(--accent);
    box-shadow: 0 20px 44px rgba(0, 0, 0, 0.34);
  }
  .talk-copy section { min-height: 92vh; transition: opacity .35s ease; opacity: .32; scroll-margin-top: 3.8rem; }
  .talk-copy section.is-current { opacity: 1; }
  .talk-copy section:first-child { padding-top: 6vh; min-height: 92vh; justify-content: center; }
}
.talk-rail-beats {
  display: flex;
  flex-wrap: wrap;
  gap: .32rem;
  margin-bottom: .55rem;
}
.talk-rail-beat {
  font: 700 .64rem/1 var(--mono);
  letter-spacing: .08em;
  padding: .24rem .48rem;
  border-radius: 999px;
  border: 1px solid var(--rule-strong);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease, background-color .15s ease;
}
.talk-rail-beat:hover { border-color: var(--accent); color: var(--ink); }
.talk-rail-beat.is-active { background: var(--accent); border-color: var(--accent); color: var(--deep); }
.talk-rail-count { font: 700 .7rem/1 var(--mono); letter-spacing: .14em; color: var(--accent); margin-top: .7rem; }
@media print {
  .talk-copy section { opacity: 1 !important; }
  .inline-visual, .talk-rail-beats { display: none !important; }
}
.talk-layout[data-talk-collapsed] .talk-copy section { opacity: 1; min-height: 0; padding: 1.6rem 0; }
.inline-visual figcaption { font: .72rem/1.45 var(--sans); color: var(--muted); }
.inline-visual .diagram-label { font: 700 .66rem/1.3 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
/* A page's photo rule stretches images to fill the rail; inline cards size to the image. */
.inline-visual img { flex: none !important; height: auto !important; max-height: 60vh; object-fit: contain; }

/* Site chrome injected by talk.js: the shared top bar + universal zoom bar. */
.topnav.in-talk { max-width: 84rem; padding-inline: 1.5rem; }
.topnav.in-talk + .zoom-bar-wrap { padding-inline: 1.5rem; }
.topnav.in-talk + .zoom-bar-wrap .zoom-bar { max-width: calc(84rem - 3rem); }
@media (max-width: 980px) {
  .topnav.in-talk, .topnav.in-talk + .zoom-bar-wrap { padding-inline: 1rem; }
  .topnav.in-talk + .zoom-bar-wrap .zoom-bar { max-width: none; }
}
.talk-back-row { display: flex; flex-wrap: wrap; gap: .6rem 1.2rem; align-items: center; margin-bottom: .9rem; }
.talk-back { display: inline-block; margin-bottom: 0; color: var(--machine); font: 700 .66rem/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; text-decoration: none; }
.talk-back:hover { text-decoration: underline; }
.talk-theme-strip { display: flex; flex-wrap: wrap; gap: .4rem .55rem; align-items: center; margin-top: .85rem; }
.talk-theme-strip .strip-lbl { font: 700 .64rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-right: .2rem; }
.talk-theme-chip { display: inline-flex; align-items: center; gap: .35rem; padding: .24rem .62rem; border-radius: 999px; border: 1px solid var(--rule-strong); background: var(--panel); color: var(--ink); font: 600 .74rem/1.2 var(--sans); text-decoration: none; }
.talk-theme-chip:hover { border-color: var(--accent); color: var(--accent); }
.talk-theme-chip.overview { color: var(--machine); border-color: var(--rule); }
.talk-theme-chip.overview:hover { border-color: var(--machine); color: var(--ink); }

/* Standardized presentation helpers (used by atlases/ theme & master presentations). */
.reading { margin: 1.2rem 0; padding: .75rem .95rem; background: var(--panel); border-left: 2px solid var(--accent); border-radius: .3rem; font: .92rem/1.55 var(--sans); }
.reading b { color: var(--accent); }
.counter-box { margin: 1.1rem 0; padding: .75rem .95rem; background: var(--deep); border: 1px solid var(--rule); border-left: 3px solid var(--machine); border-radius: .3rem; font: .92rem/1.55 var(--sans); }
.counter-box b { color: var(--machine); }
.lbl { font: 700 .66rem/1.3 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
blockquote .who { display: block; font: 600 .7rem/1.4 var(--mono); letter-spacing: .08em; color: var(--muted); font-style: normal; margin-top: .45rem; }
blockquote .who a { color: var(--machine); }
code { font: .88em var(--mono); }
.deep-dive-cta { display: inline-block; margin-top: .6rem; padding: .58rem 1rem; border-radius: 999px; background: var(--accent); color: var(--deep); font: 700 .88rem/1 var(--display); letter-spacing: .06em; text-transform: uppercase; text-decoration: none; }
.deep-dive-cta:hover { filter: brightness(1.06); }

/* Directory of talks belonging to a theme deep dive (placed between .talk-layout and .talk-xref). */
.theme-talks-dir { max-width: 84rem; margin: 0 auto; padding: 2.2rem 1.5rem; border-top: 1px solid var(--rule-strong); }
.theme-talks-dir .dir-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .5rem 1.2rem; margin-bottom: 1.1rem; }
.theme-talks-dir h2 { font-family: var(--display); text-transform: uppercase; font-weight: 600; font-size: clamp(1.5rem, 2.8vw, 2rem); letter-spacing: .02em; margin: 0; }
.theme-talks-grid { display: grid; gap: .85rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr)); }
.theme-talk-item, .xref-card { overflow: hidden; }
.card-thumb {
  display: block;
  margin: -.9rem -1rem .65rem;
  aspect-ratio: 16 / 9;
  background: var(--deep);
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}
.card-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .35s ease;
}
.theme-talk-item:hover .card-thumb img,
.xref-card:hover .card-thumb img { transform: scale(1.03); }
.theme-talk-item { display: flex; flex-direction: column; justify-content: space-between; gap: .5rem; padding: .9rem 1rem; background: var(--panel); border: 1px solid var(--rule); border-top: 2px solid var(--rule-strong); border-radius: .35rem; }
.theme-talk-item.is-counter { border-top-color: var(--machine); }
.theme-talk-item .tt-meta { font: 700 .66rem/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); display: flex; flex-wrap: wrap; gap: .4rem; justify-content: space-between; }
.theme-talk-item .tt-title { font: 600 1.2rem/1.08 var(--display); text-transform: uppercase; letter-spacing: .02em; margin: 0; }
.theme-talk-item .tt-title a { color: var(--ink); text-decoration: none; }
.theme-talk-item .tt-title a:hover { color: var(--accent); }
.theme-talk-item .tt-thesis { font-size: .86rem; line-height: 1.45; color: var(--muted); margin: 0; }
.theme-talk-item .tt-links { display: flex; gap: .8rem; font: 700 .7rem/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; margin-top: .2rem; }
.theme-talk-item .tt-links a { text-decoration: none; }
.theme-talk-item .tt-links a:hover { text-decoration: underline; }

/* Universal Cross-Reference Explorer (injected above .talk-foot by talk.js). */
.talk-xref { max-width: 84rem; margin: 0 auto; padding: 2.2rem 1.5rem 2.4rem; border-top: 1px solid var(--rule-strong); display: grid; gap: 2rem; }
.xref-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .4rem 1rem; margin-bottom: .85rem; }
.xref-head h2 { font-family: var(--display); text-transform: uppercase; font-weight: 600; font-size: clamp(1.35rem, 2.5vw, 1.85rem); letter-spacing: .02em; margin: 0; }
.xref-head .xref-sub { font: .75rem/1.4 var(--mono); color: var(--muted); }
.xref-grid { display: grid; gap: .8rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }
.xref-card { display: flex; flex-direction: column; justify-content: space-between; gap: .45rem; padding: .9rem 1rem; background: var(--panel); border: 1px solid var(--rule); border-top: 2px solid var(--rule-strong); border-radius: .35rem; }
.xref-card.is-theme { border-top-color: var(--accent); }
.xref-card.is-current-theme { background: var(--raised); border-color: var(--accent); border-top-width: 3px; }
.xref-card.is-contested { border-top-color: var(--machine); }
.xref-card .xc-kicker { font: 700 .64rem/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); display: flex; flex-wrap: wrap; gap: .35rem .6rem; justify-content: space-between; }
.xref-card .xc-title { font: 600 1.2rem/1.1 var(--display); text-transform: uppercase; letter-spacing: .02em; margin: 0; }
.xref-card .xc-title a { color: var(--ink); text-decoration: none; }
.xref-card .xc-title a:hover { color: var(--accent); }
.xref-card .xc-desc { font-size: .86rem; line-height: 1.45; color: var(--muted); margin: 0; }
.xref-card .xc-tags { display: flex; flex-wrap: wrap; gap: .3rem; }
.xref-tag { font: 700 .62rem/1.2 var(--mono); padding: .16rem .45rem; border-radius: 999px; border: 1px solid var(--rule-strong); color: var(--identity); }
.xref-tag.conflict { color: var(--accent); border-color: rgba(244, 207, 114, .4); }
.xref-card .xc-links { display: flex; flex-wrap: wrap; gap: .75rem; font: 700 .68rem/1.2 var(--mono); letter-spacing: .06em; text-transform: uppercase; margin-top: .2rem; }
.xref-card .xc-links a { text-decoration: none; }
.xref-card .xc-links a:hover { text-decoration: underline; }
.xref-prevnext { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; padding-top: .5rem; }
.xref-pn { display: flex; flex-direction: column; gap: .2rem; padding: .75rem .95rem; background: var(--panel); border: 1px solid var(--rule); border-radius: .35rem; text-decoration: none; color: var(--ink); }
.xref-pn:hover { border-color: var(--accent); }
.xref-pn.next { text-align: right; }
.xref-pn .pn-dir { font: 700 .64rem/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--machine); }
.xref-pn .pn-title { font: 600 1.08rem/1.15 var(--display); text-transform: uppercase; letter-spacing: .02em; }
.xref-pn .pn-who { font-size: .78rem; color: var(--muted); }
@media (max-width: 620px) {
  .theme-talks-dir, .talk-xref { padding-inline: 1rem; }
  .xref-prevnext { grid-template-columns: 1fr; }
  .xref-pn.next { text-align: left; }
}
@media print { .topnav, .talk-back-row, .talk-theme-strip, .talk-xref { display: none; } }