/* Neolithic World — cave-earth · ochre and oxide */
:root {
  /* dark (default) — earth-at-night */
  --bg: #1a1410;
  --bg-deep: #0e0a07;
  --bg-elev: #251c14;
  --surface: #2c2218;
  --surface-2: #382b1d;
  --paper: #f0e6cf;
  --ink: #f0e6cf;
  --ink-soft: #b8aa84;
  --ink-mute: #847a64;
  --hairline: #f0e6cf0e;
  --hairline-strong: #f0e6cf1e;
  --rule: #f0e6cf32;
  --ochre: #c9923e;          /* Lascaux ochre */
  --ochre-deep: #a07526;
  --oxide: #c8584a;          /* charred earth · oxide red */
  --oxide-deep: #a04030;
  --sage: #7a9a6e;           /* vegetation */
  --sage-deep: #547a4e;
  --charcoal: #4a3e2c;
  --shadow: 0 1px 0 #f0e6cf05 inset, 0 8px 28px #0008;
  --max: 1320px;
  --font-display: "Petrona", "Source Han Serif SC", Georgia, serif;
  --font-body: "Cardo", "PingFang SC", "Hiragino Sans GB", system-ui, serif;
  --font-mono: "Anonymous Pro", ui-monospace, monospace;
}

html[data-theme="light"] {
  --bg: #f4ead8;
  --bg-deep: #e6dcc4;
  --bg-elev: #fbf3df;
  --surface: #fffdf0;
  --surface-2: #f0e6cf;
  --paper: #1a1410;
  --ink: #1a1410;
  --ink-soft: #4a3e2c;
  --ink-mute: #847a64;
  --hairline: #1a14100e;
  --hairline-strong: #1a141022;
  --rule: #1a14103a;
  --ochre: #a07526;
  --ochre-deep: #7c5818;
  --oxide: #862b1f;
  --oxide-deep: #5e1c14;
  --sage: #4a6a3e;
  --sage-deep: #324d2c;
  --charcoal: #2a2218;
  --shadow: 0 1px 0 #fff inset, 0 6px 22px #1a14100c;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "liga", "kern";
  transition: background .25s, color .25s;
}

a { color: var(--ochre); text-decoration: none; border-bottom: 1px solid var(--rule); transition: color .15s, border-color .15s; }
a:hover { color: var(--oxide); border-bottom-color: var(--oxide); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 36px; }

/* ----- Topbar ----- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--hairline-strong);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 36px; max-width: var(--max); margin: 0 auto; gap: 16px;
}
.brand {
  display: flex; align-items: baseline; gap: 12px;
  font-family: var(--font-display); font-weight: 500;
  font-size: 26px; letter-spacing: -.01em; line-height: 1;
  color: var(--ink); border: 0;
}
.brand em { font-style: italic; color: var(--ochre); }
.nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.nav a {
  font-size: 12px; color: var(--ink-soft); border: 0;
  font-weight: 500; font-family: var(--font-mono);
  letter-spacing: .02em;
}
.nav a:hover { color: var(--ochre); }

.toolbar { display: flex; gap: 10px; align-items: center; }
.lang-toggle, .theme-toggle {
  display: inline-flex; border: 1px solid var(--hairline-strong);
  overflow: hidden; background: var(--surface);
}
.lang-toggle button, .theme-toggle button {
  background: transparent; border: 0; color: var(--ink-soft);
  padding: 6px 12px; cursor: pointer; font: inherit;
  letter-spacing: .04em;
  font-family: var(--font-mono); font-size: 11px;
}
.lang-toggle button.active, .theme-toggle button.active {
  background: var(--ink); color: var(--bg);
}

/* ----- Hero ----- */
.hero {
  padding: 100px 0 80px;
  position: relative; overflow: hidden;
  border-bottom: 2px solid var(--ink);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 80% 0%, color-mix(in srgb, var(--ochre) 12%, transparent) 0%, transparent 55%),
    radial-gradient(ellipse at 0% 80%, color-mix(in srgb, var(--oxide) 10%, transparent) 0%, transparent 55%);
}

.hero-marker {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  color: var(--ochre); text-transform: uppercase; margin-bottom: 28px;
  display: flex; align-items: center; gap: 12px; position: relative;
}
.hero-marker::before { content: ""; width: 24px; height: 1px; background: var(--ochre); }
.hero-marker::after  { content: ""; flex: 1; height: 1px; background: var(--hairline-strong); max-width: 320px; }

.hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(48px, 7vw, 100px);
  line-height: 1.0;
  letter-spacing: -.025em;
  margin: 0 0 32px;
  position: relative;
}
.hero h1 em { font-style: italic; color: var(--ochre); font-weight: 500; }
.hero h1 .alt { font-style: italic; color: var(--oxide); }

.hero-thesis {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  margin: 56px 0;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  padding: 30px 0; position: relative;
}
.hero-thesis .label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--ink-mute); text-transform: uppercase; margin-bottom: 14px;
}
.hero-thesis blockquote {
  margin: 0;
  font-family: var(--font-display); font-style: italic; font-weight: 400;
  font-size: 23px; line-height: 1.4; color: var(--ink);
  letter-spacing: -.005em;
}
.hero-thesis blockquote em { font-style: normal; color: var(--ochre); }
.hero-thesis blockquote b { color: var(--oxide); font-weight: 500; }

.hero-formula {
  font-family: var(--font-mono); font-size: 14px; line-height: 1.85;
  color: var(--ink); letter-spacing: 0;
}
.hero-formula b { color: var(--ochre); font-weight: 700; }
.hero-formula .ops { color: var(--oxide); font-weight: 700; }
.hero-formula em { color: var(--sage); font-style: normal; }

.hero-lede {
  font-size: 19px; line-height: 1.7; color: var(--ink-soft);
  max-width: 800px; margin: 0 0 36px; position: relative;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 56px; position: relative; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px;
  font: inherit; font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all .15s;
  font-family: var(--font-mono); letter-spacing: .06em;
  text-transform: uppercase; border: 1px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { background: var(--ochre); border-color: var(--ochre); color: var(--bg); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--bg); }
a.btn { border-style: solid; }

/* World map hero */
.world-wrap {
  border: 1px solid var(--rule); padding: 28px;
  background: var(--surface); position: relative;
}
.world-head {
  display: flex; justify-content: space-between; align-items: end;
  border-bottom: 1px solid var(--hairline-strong); padding-bottom: 12px; margin-bottom: 18px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase;
}
.world-head .id { color: var(--ochre); }
.world-head .ttl { color: var(--ink); font-weight: 500; font-family: var(--font-display); font-style: italic; font-size: 18px; letter-spacing: -.005em; text-transform: none; }
.world-head .rev { color: var(--ink-mute); }
.world-svg { width: 100%; aspect-ratio: 2.0; max-height: 480px; }

/* ----- Section ----- */
.section { padding: 120px 0; border-bottom: 1px solid var(--rule); position: relative; }
.section.alt { background: var(--bg-elev); }

.section-head {
  display: grid; grid-template-columns: 280px 1fr; gap: 60px;
  margin-bottom: 56px; align-items: start;
}
.section-num {
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-mute);
  letter-spacing: .14em; font-weight: 500;
  border-top: 1px solid var(--ink); padding-top: 16px;
}
.section-num .big {
  font-family: var(--font-display); font-style: italic; font-size: 56px;
  font-weight: 500; color: var(--ochre); line-height: 1;
  display: block; margin-top: 12px; letter-spacing: -.02em;
}
.section-num .desc {
  display: block; color: var(--ink-mute); margin-top: 14px;
  font-weight: 400; letter-spacing: .04em; line-height: 1.55;
  font-size: 13.5px;
}
.section-title {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(36px, 5vw, 70px); line-height: 1.0;
  letter-spacing: -.025em; margin: 0 0 18px;
}
.section-title em { font-style: italic; color: var(--ochre); }
.section-title .alt { font-style: italic; color: var(--oxide); }
.section-lede {
  font-size: 18px; color: var(--ink-soft); max-width: 720px; line-height: 1.7;
}
.section-lede em { color: var(--ink); font-style: italic; }

/* ----- Module 1 — Neolithic Revolution ===== */
.cradle-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1px; background: var(--rule); border: 1px solid var(--rule);
}
.cradle-card { background: var(--surface); padding: 28px; position: relative; }
.cradle-card .num {
  position: absolute; top: 22px; right: 26px;
  font-family: var(--font-display); font-style: italic; font-size: 38px;
  color: var(--ochre); line-height: 1; opacity: .8;
}
.cradle-card .id {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--ochre); text-transform: uppercase; font-weight: 500;
  margin-bottom: 8px;
}
.cradle-card h4 {
  font-family: var(--font-display); font-style: italic; font-weight: 500;
  font-size: 26px; margin: 0 0 6px; letter-spacing: -.005em; line-height: 1.15;
  max-width: 88%;
}
.cradle-card .span {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute);
  letter-spacing: .04em; margin-bottom: 16px;
}
.cradle-card p { margin: 0 0 14px; color: var(--ink-soft); font-size: 15px; line-height: 1.7; }
.cradle-card p em { color: var(--ink); font-style: italic; }
.cradle-tags { display: flex; gap: 6px; flex-wrap: wrap; margin: 14px 0 0; }
.cradle-tags .tag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .04em;
  padding: 3px 10px; background: var(--bg-elev); color: var(--ink-soft);
  border: 1px solid var(--hairline-strong);
}

/* ----- Module 2 — HG vs Agricultural Comparison ----- */
.compare-shell { border: 1px solid var(--rule); }
.compare-row {
  display: grid; grid-template-columns: 180px 1fr 1fr;
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}
.compare-row:last-child { border-bottom: 0; }
.compare-row > div { padding: 18px 22px; border-right: 1px solid var(--rule); }
.compare-row > div:last-child { border-right: 0; }
.compare-row .axis {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-mute); letter-spacing: .08em; font-weight: 600;
  text-transform: uppercase; padding-top: 18px;
  background: var(--bg-elev);
}
.compare-row.head { background: var(--ink); }
.compare-row.head > div {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; font-weight: 600; padding: 14px 22px;
  color: var(--bg);
}
.compare-row.head .hg { color: var(--sage); }
.compare-row.head .ag { color: var(--ochre); }
.compare-row .hg, .compare-row .ag {
  font-family: var(--font-body); font-size: 14.5px; color: var(--ink-soft);
  line-height: 1.7;
}
.compare-row .hg b, .compare-row .ag b {
  font-family: var(--font-display); font-style: italic; font-weight: 500;
  color: var(--ink); display: block; margin-bottom: 4px; font-size: 17px;
  letter-spacing: -.005em;
}
.compare-row .hg em, .compare-row .ag em { color: var(--ink); font-style: italic; }

/* ----- Module 3 — Domestication Lab ----- */
.dom-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border: 1px solid var(--rule);
}
.dom-card {
  background: var(--surface); padding: 26px;
  border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.dom-card:nth-child(4n) { border-right: 0; }
.dom-card:nth-last-child(-n+4) { border-bottom: 0; }
.dom-card .glyph {
  font-family: var(--font-display); font-style: italic; font-size: 36px;
  color: var(--ochre); line-height: 1; margin-bottom: 14px;
}
.dom-card.animal .glyph { color: var(--oxide); }
.dom-card .id {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--ink-mute); text-transform: uppercase; margin-bottom: 6px;
}
.dom-card h4 {
  font-family: var(--font-display); font-style: italic; font-weight: 500;
  font-size: 22px; margin: 0 0 6px; letter-spacing: -.005em;
}
.dom-card .when {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-mute);
  letter-spacing: .04em; margin-bottom: 12px;
}
.dom-card p { color: var(--ink-soft); font-size: 13.5px; margin: 0; line-height: 1.65; }
.dom-card p em { color: var(--ink); font-style: italic; }

/* ----- Module 4 — Megasettlement ----- */
.mega-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1px; background: var(--rule); border: 1px solid var(--rule);
}
.mega-card { background: var(--surface); padding: 30px; }
.mega-card .where {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--oxide); text-transform: uppercase; font-weight: 600;
  margin-bottom: 8px;
}
.mega-card h4 {
  font-family: var(--font-display); font-style: italic; font-weight: 500;
  font-size: 26px; margin: 0 0 6px; letter-spacing: -.005em; line-height: 1.15;
}
.mega-card .span {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute);
  letter-spacing: .04em; margin-bottom: 14px;
}
.mega-card p { color: var(--ink-soft); font-size: 14.5px; margin: 0 0 12px; line-height: 1.7; }
.mega-card p em { color: var(--ink); font-style: italic; }
.mega-stats {
  margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--hairline-strong);
  display: flex; gap: 18px; flex-wrap: wrap;
}
.mega-stats .stat {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-soft); letter-spacing: .04em;
}
.mega-stats .stat b { color: var(--ochre); font-weight: 600; display: block; font-size: 14px; font-family: var(--font-display); font-style: italic; }

/* ----- Module 5 — Ritual ----- */
.ritual-shell { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.ritual-text h3 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 32px; margin: 0 0 6px; letter-spacing: -.01em; }
.ritual-text .sub { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); letter-spacing: .12em; margin-bottom: 22px; text-transform: uppercase; }
.ritual-text p { color: var(--ink-soft); font-size: 16px; line-height: 1.75; margin: 0 0 16px; }
.ritual-text p em { color: var(--ink); font-style: italic; }
.ritual-text .pull {
  margin: 24px 0 0; padding: 22px 26px;
  border-left: 3px solid var(--oxide);
  background: var(--surface);
  font-family: var(--font-display); font-style: italic; font-size: 22px;
  line-height: 1.4; color: var(--ink); letter-spacing: -.005em;
}

.ritual-list { display: flex; flex-direction: column; gap: 14px; }
.ritual-item {
  border: 1px solid var(--rule); background: var(--surface); padding: 22px 24px;
  border-left: 3px solid var(--ochre);
}
.ritual-item:nth-child(2) { border-left-color: var(--oxide); }
.ritual-item:nth-child(3) { border-left-color: var(--sage); }
.ritual-item:nth-child(4) { border-left-color: var(--charcoal); }
.ritual-item .id {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--ochre); text-transform: uppercase; font-weight: 600;
  margin-bottom: 8px;
}
.ritual-item h5 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 20px; margin: 0 0 6px; letter-spacing: -.005em; line-height: 1.2; }
.ritual-item p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.65; }

/* ----- Module 6 — Climate ----- */
.climate-card { border: 1px solid var(--rule); background: var(--surface); padding: 36px; }
.climate-card h3 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 28px; margin: 0 0 6px; letter-spacing: -.01em; }
.climate-card .sub { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); letter-spacing: .12em; margin-bottom: 22px; text-transform: uppercase; }
.climate-svg { width: 100%; aspect-ratio: 2.4; max-height: 320px; margin-bottom: 24px; }

.climate-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.climate-cell {
  background: var(--surface); padding: 22px;
}
.climate-cell .id {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--sage); text-transform: uppercase; font-weight: 600;
  margin-bottom: 8px;
}
.climate-cell h5 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 20px; margin: 0 0 6px; letter-spacing: -.005em; }
.climate-cell p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.65; }
.climate-cell p em { color: var(--ink); font-style: italic; }

/* ----- Module 7 — Population & Disease ----- */
.pop-shell { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; }
.pop-card { border: 1px solid var(--rule); background: var(--surface); padding: 36px; }
.pop-card h3 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 28px; margin: 0 0 6px; letter-spacing: -.01em; }
.pop-card .sub { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); letter-spacing: .12em; margin-bottom: 22px; text-transform: uppercase; }
.pop-svg { width: 100%; aspect-ratio: 1.7; }

.disease-card { border: 1px solid var(--rule); background: var(--surface); padding: 36px; }
.disease-card h3 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 26px; margin: 0 0 6px; letter-spacing: -.01em; }
.disease-card .sub { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); letter-spacing: .12em; margin-bottom: 22px; text-transform: uppercase; }
.zoo {
  display: grid; grid-template-columns: 90px 1fr 70px;
  gap: 14px; padding: 14px 0; border-top: 1px dashed var(--hairline-strong);
  align-items: center;
}
.zoo:first-of-type { border-top: 0; padding-top: 4px; }
.zoo .name { font-family: var(--font-display); font-style: italic; font-size: 18px; color: var(--ink); }
.zoo .src { color: var(--ink-soft); font-size: 13.5px; line-height: 1.55; }
.zoo .src em { color: var(--ink); font-style: italic; }
.zoo .when { font-family: var(--font-mono); font-size: 11px; color: var(--oxide); letter-spacing: .04em; text-align: right; font-weight: 600; }

/* ----- Module 8 — Technology Emergence ----- */
.tech-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border: 1px solid var(--rule);
}
.tech-cell {
  background: var(--surface); padding: 26px;
  border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.tech-cell:nth-child(3n) { border-right: 0; }
.tech-cell:nth-last-child(-n+3) { border-bottom: 0; }
.tech-cell .ord {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--ochre); text-transform: uppercase; font-weight: 600; margin-bottom: 12px;
}
.tech-cell h4 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 24px; margin: 0 0 6px; letter-spacing: -.005em; }
.tech-cell .era {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute);
  letter-spacing: .04em; margin-bottom: 12px;
}
.tech-cell p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.7; }
.tech-cell p em { color: var(--ink); font-style: italic; }

/* ----- Module 9 — Comparative ----- */
.regions-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0;
  border: 1px solid var(--rule);
}
.region-cell {
  background: var(--surface); padding: 30px;
  border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.region-cell:nth-child(2n) { border-right: 0; }
.region-cell:nth-last-child(-n+2) { border-bottom: 0; }
.region-cell .flag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  color: var(--sage); text-transform: uppercase; font-weight: 600; margin-bottom: 12px;
}
.region-cell h4 { font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 26px; margin: 0 0 12px; letter-spacing: -.005em; line-height: 1.15; }
.region-cell h4 em { font-style: normal; color: var(--ochre); }
.region-cell .pattern {
  font-family: var(--font-display); font-style: italic; font-size: 16px;
  color: var(--ink); padding: 8px 0 8px 14px; border-left: 2px solid var(--ochre);
  margin: 12px 0; line-height: 1.4;
}
.region-cell p { color: var(--ink-soft); font-size: 14.5px; margin: 0 0 12px; line-height: 1.7; }
.region-cell p em { color: var(--ink); font-style: italic; }

/* ----- Module 10 — Civilization Simulator ----- */
.sim-shell { border: 1px solid var(--rule); background: var(--surface); padding: 40px; }
.sim-prompt { font-family: var(--font-display); font-style: italic; font-size: 26px; margin: 0 0 8px; letter-spacing: -.01em; line-height: 1.3; }
.sim-prompt em { font-style: normal; color: var(--ochre); }
.sim-meta { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); letter-spacing: .12em; margin-bottom: 28px; text-transform: uppercase; }

.sim-picker {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px;
  margin-bottom: 28px;
}
.sim-btn {
  background: transparent; border: 1px solid var(--hairline-strong);
  padding: 14px 12px; cursor: pointer;
  font: inherit; color: var(--ink-soft); font-family: var(--font-display); font-style: italic;
  font-size: 17px; letter-spacing: -.005em; text-align: center; transition: all .15s; line-height: 1.2;
}
.sim-btn:hover { background: var(--bg-elev); color: var(--ink); border-color: var(--ochre); }
.sim-btn.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.sim-btn .label {
  display: block; font-family: var(--font-mono); font-style: normal; font-size: 9.5px;
  color: var(--oxide); letter-spacing: .12em; margin-bottom: 6px; text-transform: uppercase;
}
.sim-btn.active .label { color: var(--ochre); }

.sim-outcome {
  background: var(--bg-deep); border: 1px dashed var(--hairline-strong); padding: 28px;
}
.sim-outcome .head {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--ink-mute); text-transform: uppercase; margin-bottom: 18px;
}
.sim-row {
  display: grid; grid-template-columns: 130px 1fr; gap: 18px;
  padding: 14px 0; border-bottom: 1px dashed var(--hairline-strong);
  font-size: 14.5px; align-items: start; line-height: 1.7;
}
.sim-row:last-child { border-bottom: 0; }
.sim-row .axis {
  font-family: var(--font-mono); font-size: 11px; color: var(--ochre);
  letter-spacing: .04em; padding-top: 3px; font-weight: 600; text-transform: uppercase;
}
.sim-row .text { color: var(--ink-soft); }
.sim-row .text em { color: var(--ink); font-style: italic; }

/* ----- Module 11 — Educator Q&A ----- */
.educator {
  border: 1px solid var(--rule); background: var(--surface);
  display: grid; grid-template-columns: 320px 1fr; min-height: 580px;
  box-shadow: var(--shadow);
}
.edu-side {
  background: var(--bg-elev); border-right: 1px solid var(--rule);
  padding: 28px;
}
.edu-side h4 {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-mute); margin: 0 0 16px; font-weight: 600;
}
.edu-pill {
  background: transparent; border: 1px solid var(--hairline-strong);
  padding: 11px 14px; font: inherit; font-size: 13.5px;
  cursor: pointer; width: 100%; text-align: left; margin-bottom: 8px;
  color: var(--ink-soft); transition: all .15s; line-height: 1.4;
  font-family: var(--font-body);
}
.edu-pill:hover { background: var(--surface); color: var(--ink); border-color: var(--ochre); }
.edu-main { display: flex; flex-direction: column; }
.edu-stream { flex: 1; padding: 32px; overflow-y: auto; max-height: 580px; }
.msg { margin-bottom: 24px; max-width: 90%; }
.msg.user { margin-left: auto; }
.msg .role {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-mute); margin-bottom: 6px; font-weight: 600;
}
.msg .bubble {
  background: var(--bg-elev); border: 1px solid var(--hairline-strong);
  padding: 16px 20px; font-size: 16px; line-height: 1.7; font-family: var(--font-body);
}
.msg.user .bubble { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.msg .bubble p { margin: 0 0 10px; }
.msg .bubble p:last-child { margin-bottom: 0; }
.msg .bubble strong { color: var(--ochre); font-weight: 600; }
.msg.user .bubble strong { color: var(--oxide); }
.msg .bubble .quoted {
  margin: 8px 0 6px; padding: 6px 0 6px 14px;
  border-left: 2px solid var(--ochre);
  font-family: var(--font-display); font-style: italic;
  font-size: 17px; line-height: 1.45; color: var(--ink-soft);
}
.edu-input {
  border-top: 1px solid var(--hairline-strong); padding: 18px;
  display: flex; gap: 10px; background: var(--bg-elev);
}
.edu-input input {
  flex: 1; border: 1px solid var(--hairline-strong); background: var(--surface); color: var(--ink);
  padding: 12px 18px; font: inherit; font-size: 15px; font-family: var(--font-body);
}
.edu-input input:focus { outline: 2px solid var(--ochre); outline-offset: -1px; }
.edu-input input::placeholder { color: var(--ink-mute); font-style: italic; }

/* ----- Footer ----- */
.footer {
  background: var(--bg-deep); color: #b8aa84;
  padding: 80px 0 40px;
  border-top: 1px solid var(--hairline-strong);
}
html[data-theme="light"] .footer { background: var(--ink); color: #c5beb1; }
html[data-theme="light"] .footer-brand { color: var(--bg); }
html[data-theme="light"] .footer a { color: #c5beb1; }
html[data-theme="light"] .footer-bottom a { color: #968d80; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 56px; }
.footer h5 {
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: .12em; color: var(--ochre); margin: 0 0 18px; font-weight: 600;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 8px; font-size: 14.5px; }
.footer a { color: #b8aa84; border: 0; }
.footer a:hover { color: var(--ochre); }
.footer-brand {
  font-family: var(--font-display); font-style: italic; font-weight: 500; font-size: 38px;
  color: var(--ink); letter-spacing: -.01em; margin-bottom: 14px; line-height: 1;
}
.footer-brand em { font-style: normal; color: var(--ochre); }
.footer-tag { color: #847a64; font-size: 14.5px; max-width: 380px; line-height: 1.7; font-style: italic; }
.footer-bottom {
  border-top: 1px solid #ffffff14; padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: #847a64; font-family: var(--font-mono);
  letter-spacing: .04em;
}
.footer-bottom a { color: #847a64; border: 0; }

/* ----- i18n ----- */
html[data-lang="en"] [lang="zh"] { display: none !important; }
html[data-lang="zh"] [lang="en"] { display: none !important; }
html[data-lang="en"][lang="zh"], html[data-lang="zh"][lang="en"] { display: block !important; }

/* ----- Responsive ----- */
@media (max-width: 1000px) {
  .nav { display: none; }
  .hero { padding: 50px 0 50px; }
  .hero-thesis { grid-template-columns: 1fr; gap: 24px; padding: 24px 0; }
  .section { padding: 70px 0; }
  .section-head { grid-template-columns: 1fr; gap: 20px; margin-bottom: 36px; }
  .cradle-grid, .mega-grid { grid-template-columns: 1fr; }
  .compare-row { grid-template-columns: 1fr; }
  .compare-row > div { border-right: 0 !important; border-bottom: 1px solid var(--rule); }
  .compare-row > div:last-child { border-bottom: 0; }
  .compare-row.head > div:nth-child(n+2) { display: none; }
  .dom-grid { grid-template-columns: 1fr 1fr; }
  .dom-card:nth-child(4n) { border-right: 1px solid var(--rule); }
  .dom-card:nth-child(2n) { border-right: 0; }
  .ritual-shell, .pop-shell { grid-template-columns: 1fr; gap: 24px; }
  .climate-list { grid-template-columns: 1fr; }
  .tech-grid, .regions-grid { grid-template-columns: 1fr; }
  .tech-cell, .region-cell { border-right: 0 !important; border-bottom: 1px solid var(--rule) !important; }
  .tech-cell:last-child, .region-cell:last-child { border-bottom: 0 !important; }
  .sim-picker { grid-template-columns: 1fr 1fr; }
  .educator { grid-template-columns: 1fr; min-height: 0; }
  .edu-side { border-right: 0; border-bottom: 1px solid var(--rule); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .toolbar { gap: 6px; }
  .lang-toggle button, .theme-toggle button { padding: 5px 8px; font-size: 10px; }
}
@media (max-width: 600px) {
  .dom-grid { grid-template-columns: 1fr; }
  .dom-card { border-right: 0 !important; }
}

/* ----- utility ----- */
.fade-in { opacity: 0; transform: translateY(8px); transition: opacity .5s, transform .5s; }
.fade-in.in { opacity: 1; transform: none; }