/* ============================================================
   Laboratorio de Sistemas Complejos — stylesheet
   tokens · base · sections · components
============================================================ */

:root {
  /* paper / ink */
  --bg:           #faf8f4;
  --bg-warm:      #f3efe7;
  --bg-card:      #ffffff;
  --bg-deep:      #efeae0;
  --ink:          #1a1a1f;
  --ink-2:        #3a3a44;
  --ink-3:        #6a6a76;
  --ink-4:        #9a9aa6;
  --rule:         #d8d3c7;
  --rule-soft:    #e8e2d4;

  /* accents — saturated, used inside vis only */
  --cyan:         #0fb5c4;
  --cyan-deep:    #047d89;
  --violet:       #7c3aed;
  --violet-deep:  #5b21b6;
  --orange:       #ea7e3a;
  --orange-deep:  #c2410c;
  --pink:         #e63990;

  /* gallery hues */
  --hue-mandel:   #7c3aed;
  --hue-julia:    #0fb5c4;
  --hue-koch:     #ea7e3a;
  --hue-sier:     #e63990;
  --hue-barn:     #16a34a;
  --hue-cantor:   #1a1a1f;

  /* type */
  --ff-display:   'Newsreader', Georgia, 'Times New Roman', serif;
  --ff-body:      'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --ff-mono:      'JetBrains Mono', ui-monospace, 'SF Mono', 'Consolas', monospace;

  /* layout */
  --col-w:        720px;
  --col-wide:     1080px;
  --col-bleed:    1320px;

  --radius:       8px;
  --radius-lg:    14px;
  --shadow:       0 1px 0 rgba(20,20,30,0.04), 0 8px 24px -16px rgba(20,20,30,0.18);
  --shadow-lift:  0 1px 0 rgba(20,20,30,0.04), 0 20px 50px -20px rgba(20,20,30,0.25);
}

/* ----------------------------------------------------------
   reset / base
---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ff-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
em { font-style: italic; font-family: var(--ff-display); font-weight: 500; }

/* mono utility */
.mono       { font-family: var(--ff-mono); font-size: 0.78em; letter-spacing: 0.02em; }
.mono--dim  { color: var(--ink-4); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.72em; }
.mono--big  { font-size: 1.4rem; letter-spacing: 0; text-transform: none; color: var(--ink); }

/* ----------------------------------------------------------
   nav
---------------------------------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px) saturate(1.1);
  -webkit-backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid var(--rule-soft);
}
.nav__inner {
  max-width: var(--col-bleed);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex; align-items: center; gap: 32px;
  position: relative;
}
.nav__brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 16px;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: var(--ink);
}
.nav__brand:hover .nav__brand-text { color: var(--violet); }
.nav__brand-text { transition: color 160ms; }
.nav__logo {
  width: 22px; height: 22px;
  background:
    radial-gradient(circle at 35% 35%, var(--violet) 0 22%, transparent 23%),
    radial-gradient(circle at 70% 60%, var(--cyan) 0 18%, transparent 19%),
    radial-gradient(circle at 50% 85%, var(--orange) 0 14%, transparent 15%),
    var(--bg-warm);
  border-radius: 6px;
  border: 1px solid var(--rule);
}
.nav__logo--lg { width: 36px; height: 36px; border-radius: 8px; }
.nav__links {
  list-style: none; padding: 0; margin: 0 0 0 auto;
  display: flex; gap: 22px;
}
.nav__links a {
  font-size: 14px; color: var(--ink-2);
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms, color 160ms;
}
.nav__links a:hover { color: var(--ink); border-bottom-color: var(--ink); }
.nav__links a.is-current { color: var(--ink); border-bottom-color: var(--violet); }

.nav__progress {
  position: absolute; left: 0; bottom: -1px; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 60%, var(--orange));
  width: 0%;
  transition: width 80ms linear;
}

@media (max-width: 760px) {
  .nav__links { display: none; }
  .nav__inner { padding: 12px 18px; }
}

/* ----------------------------------------------------------
   hero
---------------------------------------------------------- */
.hero {
  position: relative;
  min-height: calc(100vh - 50px);
  height: 92vh;
  overflow: hidden;
  background: #0c0a14;
  color: #f4eedf;
  display: flex; flex-direction: column;
  isolation: isolate;
}
.hero__canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 0;
  will-change: transform;
}
.hero__veil {
  position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(ellipse at 20% 90%, rgba(12,10,20,0.55), transparent 60%),
    radial-gradient(ellipse at 80% 10%, rgba(12,10,20,0.35), transparent 60%),
    linear-gradient(180deg, rgba(12,10,20,0.10) 0%, rgba(12,10,20,0.45) 100%);
  pointer-events: none;
}
.hero__grain {
  position: absolute; inset: 0; z-index: 2;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255,255,255,0.04) 1px, transparent 1.5px);
  background-size: 3px 3px;
  mix-blend-mode: overlay;
  opacity: 0.6;
  pointer-events: none;
}

.hero__content {
  position: relative; z-index: 3;
  max-width: var(--col-bleed);
  margin: 0 auto;
  padding: clamp(60px, 12vh, 140px) clamp(24px, 5vw, 80px) 60px;
  width: 100%;
  flex: 1;
  display: flex; flex-direction: column; justify-content: center;
  align-items: flex-start;
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--ff-mono);
  font-size: 12px;
  color: rgba(244, 238, 223, 0.7);
  letter-spacing: 0.1em;
  padding: 7px 14px 7px 10px;
  border: 1px solid rgba(244, 238, 223, 0.18);
  border-radius: 99px;
  background: rgba(255,255,255,0.03);
  margin-bottom: 36px;
}
.dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
.dot--cyan   { background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
.dot--violet { background: var(--violet); box-shadow: 0 0 12px var(--violet); }
.dot--orange { background: var(--orange); box-shadow: 0 0 12px var(--orange); }

.hero__title {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(48px, 8.5vw, 124px);
  line-height: 0.97;
  letter-spacing: -0.025em;
  margin: 0 0 26px;
  text-wrap: balance;
}
.hero__title em {
  font-family: var(--ff-display);
  font-style: italic;
  font-weight: 500;
  background: linear-gradient(90deg, #ffd9a8 0%, #f6c5ff 50%, #b8f1ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero__sub {
  font-family: var(--ff-display);
  font-style: italic;
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 400;
  margin: 0 0 26px;
  color: rgba(244, 238, 223, 0.85);
}
.hero__lede {
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.6;
  color: rgba(244, 238, 223, 0.7);
  max-width: 560px;
  margin: 0 0 44px;
}

.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }

.hero__meta {
  position: relative; z-index: 3;
  max-width: var(--col-bleed);
  margin: 0 auto;
  width: 100%;
  padding: 0 clamp(24px, 5vw, 80px) 32px;
  display: flex; gap: 38px;
  font-family: var(--ff-mono);
  font-size: 12px;
  color: rgba(244, 238, 223, 0.75);
}
.hero__meta-block { display: flex; flex-direction: column; gap: 4px; }
.hero__meta-block .mono--dim { color: rgba(244, 238, 223, 0.4); }
.hero__meta-block--scroll { margin-left: auto; align-items: flex-end; }
.scroll-cue {
  width: 22px; height: 36px;
  border: 1px solid rgba(244,238,223,0.5);
  border-radius: 12px;
  position: relative;
}
.scroll-cue::after {
  content: '';
  position: absolute; left: 50%; top: 8px;
  width: 3px; height: 8px;
  background: rgba(244,238,223,0.8);
  border-radius: 2px;
  transform: translateX(-50%);
  animation: scrollcue 1.8s infinite ease-in-out;
}
@keyframes scrollcue {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.9; }
  50%      { transform: translateX(-50%) translateY(8px); opacity: 0.25; }
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px;
  font-family: var(--ff-body);
  font-weight: 500; font-size: 15px;
  border-radius: 99px;
  border: 1px solid transparent;
  transition: transform 120ms, background 180ms, border-color 180ms;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--bg);
  color: var(--ink);
}
.btn--primary:hover { background: #fff; }
.btn--ghost {
  background: transparent;
  color: rgba(244,238,223,0.9);
  border-color: rgba(244,238,223,0.25);
}
.btn--ghost:hover { border-color: rgba(244,238,223,0.6); color: #fff; }
.btn--sm { padding: 8px 14px; font-size: 13px; }

/* on light sections, ghost btn needs darker treatment */
.section .btn--ghost { color: var(--ink-2); border-color: var(--rule); }
.section .btn--ghost:hover { border-color: var(--ink); color: var(--ink); }

/* ----------------------------------------------------------
   section base
---------------------------------------------------------- */
.section {
  max-width: var(--col-bleed);
  margin: 0 auto;
  padding: clamp(80px, 12vh, 140px) clamp(24px, 5vw, 80px);
  position: relative;
}
.section__head {
  display: flex; gap: 18px;
  margin-bottom: 28px;
  align-items: center;
}
.section__head::after {
  content: ''; flex: 1; height: 1px;
  background: linear-gradient(90deg, var(--rule), transparent);
}
.section__index, .section__kicker { color: var(--ink-3); }
.section__title {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 48px;
  max-width: 16ch;
  text-wrap: balance;
}

.prose {
  max-width: var(--col-w);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
}
.prose p + p { margin-top: 1.1em; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose__lede {
  font-family: var(--ff-display);
  font-size: clamp(22px, 2.2vw, 28px);
  line-height: 1.4;
  font-weight: 400;
  color: var(--ink);
  margin: 0 0 32px;
  text-wrap: pretty;
}
.prose__lede em { font-family: var(--ff-display); }
.prose__lede--centered {
  text-align: center;
  margin-left: auto; margin-right: auto;
  margin-bottom: 56px;
}

/* ----------------------------------------------------------
   callout (in intro)
---------------------------------------------------------- */
.callout {
  margin: 36px 0;
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.callout__strip {
  width: 6px; flex-shrink: 0;
  background: linear-gradient(180deg, var(--cyan), var(--violet), var(--orange));
}
.callout__body { padding: 24px 28px; }
.callout__body p { margin: 0; }
.callout__body p + p { margin-top: 10px; }

/* ----------------------------------------------------------
   embed (iframe wrapper)
---------------------------------------------------------- */
.embed {
  margin: 56px auto 28px;
  max-width: var(--col-wide);
}
.embed__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--rule);
  background: #f5f3f0;
  box-shadow: var(--shadow-lift);
}
.embed__frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.embed__caption {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-3);
  max-width: var(--col-w);
  margin-left: auto; margin-right: auto;
  text-align: center;
}
.embed__caption strong { color: var(--ink); font-weight: 600; }

@media (max-width: 720px) {
  .embed__frame { aspect-ratio: 4/5; }
}

/* ----------------------------------------------------------
   dimension intuition rows
---------------------------------------------------------- */
.dim-intuition {
  margin: 40px 0 32px;
  max-width: var(--col-w);
  display: flex; flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--rule-soft);
}
.dim-row {
  display: flex; align-items: center; gap: 24px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink-3);
}
.dim-row__icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  background: var(--bg-warm);
  border-radius: 8px;
  color: var(--ink-2);
  flex-shrink: 0;
}
.dim-row__icon svg { width: 36px; height: 36px; }
.dim-row__val {
  display: block;
  font-family: var(--ff-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}
.dim-row__lbl { font-size: 16px; color: var(--ink-2); }
.dim-row--accent .dim-row__icon {
  background: linear-gradient(135deg, var(--violet) 0%, var(--orange) 100%);
  color: #fff;
}
.dim-row--accent .dim-row__val { color: var(--violet); }

/* ----------------------------------------------------------
   box-counting widget
---------------------------------------------------------- */
.bc {
  margin: 64px auto;
  max-width: var(--col-wide);
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}
.bc__head {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 24px;
  margin-bottom: 22px; flex-wrap: wrap;
}
.bc__title {
  font-family: var(--ff-display);
  font-size: 24px;
  font-weight: 500;
  margin: 0 0 4px;
}
.bc__sub { margin: 0; }
.bc__readout { display: flex; gap: 28px; }
.bc__readout-block { display: flex; flex-direction: column; gap: 2px; min-width: 80px; }
.bc__readout-block--accent .mono--big { color: var(--violet); }

.bc__panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}
.bc__panel {
  background: #fbf9f6;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  overflow: hidden;
  position: relative;
}
.bc__panel canvas { width: 100%; height: 100%; display: block; }

.bc__controls {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
  padding-top: 6px;
}
.bc__controls input[type=range] {
  flex: 1; min-width: 200px;
  accent-color: var(--violet);
  height: 22px;
}

@media (max-width: 720px) {
  .bc { padding: 18px; }
  .bc__panels { grid-template-columns: 1fr; }
  .bc__readout { gap: 18px; width: 100%; }
}

/* ----------------------------------------------------------
   formal math (collapsible)
---------------------------------------------------------- */
.formal {
  max-width: var(--col-w);
  margin: 36px 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-card);
  overflow: hidden;
}
.formal__summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  display: flex; align-items: center; gap: 12px;
  font-family: var(--ff-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  text-transform: uppercase;
  transition: background 160ms;
}
.formal__summary::-webkit-details-marker { display: none; }
.formal__summary:hover { background: var(--bg-warm); }
.formal__chev {
  width: 12px; height: 12px;
  border-right: 1.5px solid var(--ink-2);
  border-bottom: 1.5px solid var(--ink-2);
  transform: rotate(-45deg);
  transition: transform 200ms;
  flex-shrink: 0;
}
.formal[open] .formal__chev { transform: rotate(45deg); }
.formal__body {
  padding: 0 22px 24px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 18px;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ink-2);
}
.formal__body p + p { margin-top: 14px; }
.formal__eq {
  background: var(--bg-warm);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 14.5px;
  text-align: center;
  color: var(--ink);
}
.formal__ref { margin-top: 14px; font-size: 12px; }

/* ----------------------------------------------------------
   concept map
---------------------------------------------------------- */
.section--map { background: var(--bg-warm); max-width: none; }
.section--map > * { max-width: var(--col-bleed); margin-left: auto; margin-right: auto; }

.map {
  position: relative;
  width: 100%;
  max-width: var(--col-bleed);
  aspect-ratio: 16/9;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.map__svg { width: 100%; height: 100%; cursor: grab; }
.map__svg:active { cursor: grabbing; }
.map__legend {
  position: absolute; left: 18px; bottom: 16px;
  display: flex; gap: 18px;
  font-size: 11px; color: var(--ink-3);
}
.map__legend-item { display: inline-flex; align-items: center; gap: 6px; }
.map__swatch { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.map__swatch--active  { background: var(--violet); }
.map__swatch--current { background: var(--cyan); box-shadow: 0 0 0 2px rgba(15,181,196,0.25); }
.map__swatch--lock    { background: var(--ink-4); }

.map__tooltip {
  position: absolute; pointer-events: none;
  background: var(--ink);
  color: #f4eedf;
  font-size: 13px; line-height: 1.45;
  padding: 10px 14px;
  border-radius: 8px;
  max-width: 240px;
  opacity: 0;
  transform: translate(-50%, calc(-100% - 14px));
  transition: opacity 140ms;
  z-index: 10;
  box-shadow: var(--shadow-lift);
}
.map__tooltip::after {
  content: '';
  position: absolute; left: 50%; bottom: -5px;
  width: 10px; height: 10px;
  background: var(--ink);
  transform: translateX(-50%) rotate(45deg);
}
.map__tooltip.is-visible { opacity: 1; }
.map__tooltip-title { display: block; font-family: var(--ff-body); font-weight: 600; margin-bottom: 2px; }
.map__tooltip-desc  { display: block; color: rgba(244,238,223,0.7); font-size: 12px; }

@media (max-width: 760px) {
  .map { aspect-ratio: 4/5; }
}

/* ----------------------------------------------------------
   gallery
---------------------------------------------------------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform 240ms cubic-bezier(.2,.7,.3,1), box-shadow 240ms, border-color 240ms;
  display: flex; flex-direction: column;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--ink-4);
}
.card__canvas-wrap {
  aspect-ratio: 1.15/1;
  background: #07060d;
  position: relative;
  overflow: hidden;
}
.card__canvas-wrap canvas { width: 100%; height: 100%; }
.card__hue {
  position: absolute; top: 14px; left: 14px;
  width: 10px; height: 10px;
  border-radius: 50%;
  box-shadow: 0 0 14px currentColor;
}
.card__body { padding: 18px 20px 22px; }
.card__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 21px;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.card__dim {
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--ink-3);
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 12px;
}
.card__dim strong { color: var(--ink); font-weight: 600; font-size: 14px; }
.card__desc { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-2); }

.card__expand {
  display: none;
  padding: 0 20px 20px;
  font-size: 13.5px; line-height: 1.6; color: var(--ink-2);
  border-top: 1px dashed var(--rule);
  margin-top: 4px; padding-top: 16px;
}
.card.is-open .card__expand { display: block; }
.card__expand p { margin: 0; }
.card__expand p + p { margin-top: 10px; }
.card__expand .mono { display: inline-block; padding: 2px 6px; background: var(--bg-warm); border-radius: 4px; }
.card__expand-eq {
  background: var(--bg-warm);
  padding: 10px 14px;
  margin: 10px 0;
  border-radius: 6px;
  font-family: var(--ff-mono);
  font-size: 13px;
  text-align: center;
}

/* ----------------------------------------------------------
   nature cards
---------------------------------------------------------- */
.section--nature { background: var(--bg-deep); max-width: none; }
.section--nature > * { max-width: var(--col-bleed); margin-left: auto; margin-right: auto; }

.nature {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.ncard {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--rule);
  display: flex; flex-direction: column;
  transition: transform 240ms;
}
.ncard:hover { transform: translateY(-3px); }
.ncard__img {
  aspect-ratio: 4/3;
  position: relative;
  overflow: hidden;
  background: var(--bg-warm);
}
.ncard__img canvas { width: 100%; height: 100%; display: block; }
.ncard__tag {
  position: absolute; top: 12px; left: 12px;
  background: rgba(20,20,30,0.78);
  color: #f4eedf;
  font-family: var(--ff-mono);
  font-size: 11px;
  padding: 5px 9px;
  border-radius: 99px;
  letter-spacing: 0.04em;
}
.ncard__body { padding: 18px 20px 22px; }
.ncard__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 19px;
  margin: 0 0 6px;
}
.ncard__dim {
  font-family: var(--ff-mono);
  font-size: 12px; color: var(--ink-3);
  margin-bottom: 10px;
}
.ncard__dim strong { color: var(--violet); font-weight: 600; font-size: 13px; }
.ncard__txt { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-2); }

/* ----------------------------------------------------------
   footer
---------------------------------------------------------- */
.foot {
  background: #14131a;
  color: #e6dfd0;
  padding: 80px clamp(24px, 5vw, 80px) 40px;
  font-size: 15px;
}
.foot__top {
  max-width: var(--col-bleed);
  margin: 0 auto 56px;
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 48px; flex-wrap: wrap;
}
.foot__brand { display: flex; align-items: center; gap: 14px; }
.foot__name {
  font-family: var(--ff-display);
  font-size: 22px;
  font-weight: 500;
  margin: 0;
}
.foot__tag {
  margin: 2px 0 0;
  font-family: var(--ff-display);
  font-style: italic;
  font-size: 15px;
  color: rgba(230,223,208,0.6);
}
.foot__credit {
  margin: 0;
  max-width: 460px;
  font-size: 14px;
  color: rgba(230,223,208,0.6);
  line-height: 1.55;
}

.foot__grid {
  max-width: var(--col-bleed);
  margin: 0 auto 56px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 36px;
  border-top: 1px solid rgba(230,223,208,0.12);
  border-bottom: 1px solid rgba(230,223,208,0.12);
  padding: 40px 0;
}
.foot__col-title { margin: 0 0 14px; color: rgba(230,223,208,0.45); }
.foot__list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; font-size: 14px; color: rgba(230,223,208,0.85); }
.foot__list em { font-family: var(--ff-display); font-style: italic; }
.foot__link {
  color: rgba(230,223,208,0.85);
  border-bottom: 1px solid rgba(230,223,208,0.15);
  padding-bottom: 1px;
  transition: border-color 160ms, color 160ms;
}
.foot__link:hover { border-bottom-color: var(--cyan); color: #fff; }

.foot__bottom {
  max-width: var(--col-bleed);
  margin: 0 auto;
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 40px; flex-wrap: wrap;
}
.foot__quote {
  font-family: var(--ff-display);
  font-size: 18px;
  font-style: italic;
  line-height: 1.5;
  max-width: 540px;
  margin: 0;
  color: rgba(230,223,208,0.85);
}
.foot__quote em { font-style: italic; }
.foot__copy { margin: 0; }

/* ----------------------------------------------------------
   reveal on scroll
---------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 700ms, transform 700ms cubic-bezier(.2,.7,.3,1); }
.reveal.is-in { opacity: 1; transform: translateY(0); }

/* prevent layout shift for canvases */
canvas { background-color: transparent; }

/* ============================================================
   HERO — concept-map variant (overrides for first-page-as-map)
============================================================ */
.hero--map {
  height: auto;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto auto;
  padding: 18px 0 22px;
}
.hero--map .hero__canvas { opacity: 0.55; filter: saturate(1.05) blur(0.3px); }
.hero__veil--map {
  background:
    radial-gradient(ellipse at 50% 50%, rgba(12,10,20,0.25), rgba(12,10,20,0.55) 60%, rgba(12,10,20,0.8) 100%);
}

.hero__head {
  position: relative; z-index: 3;
  max-width: var(--col-bleed);
  margin: 0 auto;
  width: 100%;
  padding: 18px clamp(24px, 5vw, 80px) 4px;
  text-align: left;
}
.hero__title--compact {
  font-size: clamp(30px, 4.6vw, 60px);
  margin: 12px 0 8px;
  line-height: 1.0;
}
.hero__title--compact em {
  font-family: var(--ff-display);
  font-style: italic;
  font-weight: 500;
  background: linear-gradient(90deg, #ffd9a8 0%, #f6c5ff 50%, #b8f1ff 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero--map .hero__sub { margin: 0; font-size: clamp(15px, 1.5vw, 19px); }

.hero__map-wrap {
  position: relative; z-index: 3;
  width: 100%;
  max-width: var(--col-bleed);
  margin: 0 auto;
  padding: 4px clamp(24px, 5vw, 80px);
  display: flex; flex-direction: column;
}
.hero__map {
  width: 100%;
  height: clamp(380px, 64vh, 720px);
  background: transparent;
  cursor: grab;
  touch-action: none;
}
.hero__map:active { cursor: grabbing; }
.hero__foot {
  position: relative; z-index: 3;
  max-width: var(--col-bleed);
  margin: 0 auto; width: 100%;
  padding: 8px clamp(24px, 5vw, 80px) 12px;
  display: flex; align-items: center; gap: 14px; justify-content: center;
  color: rgba(244, 238, 223, 0.7);
}
.mono--light { color: rgba(244, 238, 223, 0.55) !important; }

.hero__map-wrap .map__legend {
  position: relative;
  display: flex; gap: 22px;
  margin-top: 8px; padding: 0 4px;
  font-size: 11px;
  color: rgba(244, 238, 223, 0.6);
}
.hero__map-wrap .map__legend-item { display: inline-flex; align-items: center; gap: 7px; }
.hero__map-wrap .map__swatch { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.hero__map-wrap .map__swatch--core   { background: linear-gradient(135deg, var(--cyan), var(--violet)); }
.hero__map-wrap .map__swatch--active { background: var(--violet); }
.hero__map-wrap .map__swatch--lock   { background: rgba(244,238,223,0.35); }
.hero__map-wrap .map__legend-hint { margin-left: auto; font-style: italic; }

/* tooltip on dark hero — use light variant */
.hero__map-wrap .map__tooltip {
  position: fixed;
  background: rgba(255, 250, 240, 0.96);
  color: #1a1a1f;
  font-size: 13px; line-height: 1.45;
  padding: 12px 16px;
  border-radius: 10px;
  max-width: 280px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(-100% - 12px));
  transition: opacity 140ms;
  z-index: 30;
  box-shadow: 0 20px 50px -10px rgba(0,0,0,0.5);
  border: 1px solid rgba(0,0,0,0.08);
}
.hero__map-wrap .map__tooltip::after {
  content: ''; position: absolute; left: 50%; bottom: -5px;
  width: 10px; height: 10px;
  background: rgba(255, 250, 240, 0.96);
  transform: translateX(-50%) rotate(45deg);
}
.hero__map-wrap .map__tooltip.is-visible { opacity: 1; }
.map__tooltip-title { display: block; font-family: var(--ff-body); font-weight: 600; margin-bottom: 3px; }
.map__tooltip-desc  { display: block; color: #6a6a76; font-size: 12px; }
.map__tooltip-cta   { display: block; margin-top: 4px; font-family: var(--ff-mono); font-size: 10px; color: var(--violet-deep); letter-spacing: 0.05em; text-transform: uppercase; }

@media (max-width: 760px) {
  .hero__map { height: 540px; }
  .hero__map-wrap .map__legend { flex-wrap: wrap; gap: 12px; }
  .hero__map-wrap .map__legend-hint { display: none; }
}

/* ============================================================
   MODAL — Sistemas Complejos explainer
============================================================ */
.modal {
  position: fixed; inset: 0;
  z-index: 200;
  display: none;
  align-items: center; justify-content: center;
  padding: 24px;
}
.modal.is-open { display: flex; }
.modal__backdrop {
  position: absolute; inset: 0;
  background: rgba(12, 10, 20, 0.62);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.modal__panel {
  position: relative;
  background: var(--bg-card);
  color: var(--ink);
  max-width: 760px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  border-radius: 16px;
  border: 1px solid var(--rule);
  padding: 38px clamp(24px, 4vw, 48px);
  box-shadow: 0 40px 80px -20px rgba(0,0,0,0.6);
  animation: modalIn 280ms cubic-bezier(.2,.7,.3,1);
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}
.modal__close {
  position: absolute; top: 14px; right: 16px;
  width: 36px; height: 36px;
  border: 1px solid var(--rule);
  background: var(--bg);
  border-radius: 99px;
  font-size: 22px; line-height: 1;
  color: var(--ink-2);
  display: grid; place-items: center;
  transition: border-color 160ms, color 160ms;
}
.modal__close:hover { border-color: var(--ink); color: var(--ink); }

.modal__kicker { margin: 0 0 8px; }
.modal__title {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  line-height: 1.05;
}
.modal__title em {
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.modal__lede {
  font-family: var(--ff-display);
  font-size: 20px; line-height: 1.45;
  color: var(--ink);
  margin: 0 0 28px;
}
.modal__lede em { font-family: var(--ff-display); }
.modal__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}
.modal__cell .mono--dim { margin: 0 0 10px; display: block; }
.modal__list { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 14.5px; line-height: 1.55; }
.modal__list li { margin-bottom: 5px; }
.modal__list li::marker { color: var(--violet); }

.modal__why {
  border-top: 1px solid var(--rule-soft);
  padding-top: 22px;
}
.modal__why-title {
  font-family: var(--ff-display);
  font-size: 20px;
  font-weight: 500;
  margin: 0 0 10px;
}
.modal__why p { margin: 0; color: var(--ink-2); font-size: 15.5px; line-height: 1.6; }
.modal__why p + p { margin-top: 14px; }
.modal__why-paths a {
  font-family: var(--ff-mono);
  font-size: 13px;
  color: var(--violet-deep);
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-right: 18px;
  border-bottom: 1px solid currentColor;
  white-space: nowrap;
}
.modal__why-paths a:hover { color: var(--ink); }

@media (max-width: 600px) {
  .modal__grid { grid-template-columns: 1fr; gap: 22px; }
  .modal__panel { padding: 28px 22px; }
}

/* ============================================================
   BRANCH INTRO — banner between rama sections
============================================================ */
.branch-intro {
  background: linear-gradient(180deg, #14131a 0%, #1d1c25 100%);
  color: #f4eedf;
  padding: 80px clamp(24px, 5vw, 80px);
  position: relative;
}
.branch-intro::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(124,58,237,0.15), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(15,181,196,0.10), transparent 50%);
  pointer-events: none;
}
.branch-intro--violet::before {
  background:
    radial-gradient(circle at 30% 30%, rgba(124,58,237,0.20), transparent 55%),
    radial-gradient(circle at 75% 75%, rgba(230,57,144,0.12), transparent 55%);
}
.branch-intro--cyan::before {
  background:
    radial-gradient(circle at 30% 30%, rgba(15,181,196,0.20), transparent 55%),
    radial-gradient(circle at 75% 75%, rgba(234,126,58,0.10), transparent 55%);
}
.branch-intro__inner {
  position: relative;
  max-width: var(--col-bleed);
  margin: 0 auto;
}
.branch-intro__kicker {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid rgba(244,238,223,0.18);
  border-radius: 99px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(244,238,223,0.7);
  margin-bottom: 24px;
}
.branch-intro__title {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(40px, 6vw, 80px);
  line-height: 1.0;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
  max-width: 14ch;
  text-wrap: balance;
}
.branch-intro__sub {
  font-family: var(--ff-display);
  font-style: italic;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.45;
  color: rgba(244,238,223,0.75);
  max-width: 640px;
  margin: 0 0 28px;
}
.branch-intro__list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 10px;
}
.branch-intro__list a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid rgba(244,238,223,0.18);
  border-radius: 99px;
  font-size: 13px;
  color: rgba(244,238,223,0.85);
  transition: background 160ms, border-color 160ms, color 160ms;
}
.branch-intro__list a:hover {
  background: rgba(244,238,223,0.08);
  border-color: rgba(244,238,223,0.45);
  color: #fff;
}

/* ============================================================
   PROSE sub-headers
============================================================ */
.prose__sub {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 40px 0 16px;
  color: var(--ink);
}

/* "why" grid — 3 cells of motivation copy */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 28px 0 36px;
  max-width: var(--col-wide);
}
.why-grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.why {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.why p { margin: 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.55; }
.why p + p { margin-top: 8px; }
.why .mono--dim { margin: 0 0 8px; }

/* ============================================================
   SUB-SECTIONS inside a major section
============================================================ */
.section__sub {
  margin-top: 72px;
  padding-top: 8px;
}
.section__sub--feature {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 32px clamp(20px, 3vw, 38px);
  box-shadow: var(--shadow);
}
.section__sub-title {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 8px 0 24px;
  max-width: 18ch;
}

/* ============================================================
   MULTIFRACTAL — section background tint
============================================================ */
.section--multifractal {
  background: var(--bg-warm);
  max-width: none;
}
.section--multifractal > * {
  max-width: var(--col-bleed);
  margin-left: auto; margin-right: auto;
}
.embed__frame--tall { aspect-ratio: 16/10; }
@media (max-width: 720px) {
  .embed__frame--tall { aspect-ratio: 3/4; }
}

/* ============================================================
   TDA CARDS — simplicial primer
============================================================ */
.tda-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 36px 0;
  max-width: var(--col-wide);
}
.tda-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex; flex-direction: column;
  gap: 10px;
}
.tda-card__num { color: var(--violet); font-weight: 600; }
.tda-card__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 20px;
  margin: 0;
  line-height: 1.15;
}
.tda-card__viz {
  aspect-ratio: 1.6/1;
  background: var(--bg-warm);
  border-radius: 6px;
  display: grid; place-items: center;
  padding: 6px;
}
.tda-card__viz svg { width: 100%; height: 100%; }
.tda-card__txt { margin: 0; color: var(--ink-2); font-size: 14px; line-height: 1.55; }

.section--tda {
  background: var(--bg);
}
.embed__frame--tda { aspect-ratio: 16/9; }
@media (max-width: 760px) {
  .embed__frame--tda { aspect-ratio: 4/5; }
}

/* ============================================================
   NETWORK SECTION — types, metrics, WS, cases
============================================================ */
.section--net {
  background: var(--bg);
}

/* Tipos de redes */
.net-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 8px 0 16px;
}
.nt-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex; flex-direction: column;
}
.nt-card__viz {
  aspect-ratio: 1.2/1;
  background: #07060d;
  position: relative;
}
.nt-card__viz svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.nt-card__body { padding: 16px 18px 20px; }
.nt-card__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 19px;
  margin: 0 0 4px;
}
.nt-card__meta {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--ink-4);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin: 0 0 10px;
}
.nt-card__txt { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-2); }

/* Métricas */
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 12px 0 28px;
}
.metric {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px 22px 22px;
  display: flex; flex-direction: column;
  gap: 12px;
}
.metric__head { display: flex; align-items: center; gap: 12px; }
.metric__icon {
  width: 38px; height: 38px;
  border-radius: 8px;
  display: grid; place-items: center;
  flex-shrink: 0;
  background: var(--bg-warm);
}
.metric__icon svg { width: 22px; height: 22px; }
.metric__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 19px;
  margin: 0;
}
.metric__formula {
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--ink-3);
  background: var(--bg-warm);
  padding: 6px 10px;
  border-radius: 6px;
  align-self: flex-start;
}
.metric__txt {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
}
.metric__use {
  font-size: 12.5px;
  color: var(--ink-3);
  font-style: italic;
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--rule-soft);
}

/* Watts–Strogatz widget */
.ws {
  background: var(--bg);
  border-radius: 12px;
  padding: 18px 0 0;
  margin-top: 12px;
}
.ws__head {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 24px;
  margin-bottom: 20px; flex-wrap: wrap;
}
.ws__title {
  font-family: var(--ff-display);
  font-size: 22px; font-weight: 500;
  margin: 0 0 4px;
}
.ws__sub { margin: 0; }
.ws__readout { display: flex; gap: 24px; }
.ws__stat { display: flex; flex-direction: column; gap: 2px; min-width: 70px; }
.ws__stat .mono--big { font-size: 1.5rem; }

.ws__panels {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 16px;
  margin-bottom: 16px;
}
.ws__panel {
  background: #fbf9f6;
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  aspect-ratio: 1.05/1;
  overflow: hidden;
  position: relative;
}
.ws__panel svg, .ws__panel canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%; display: block;
}

.ws__controls {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
  padding: 6px 0;
}
.ws__controls input[type=range] {
  flex: 1; min-width: 200px;
  accent-color: var(--cyan);
  height: 22px;
}
.ws__caption { margin-top: 12px; font-size: 12px; line-height: 1.55; }

@media (max-width: 760px) {
  .ws__panels { grid-template-columns: 1fr; }
  .ws__readout { gap: 18px; width: 100%; }
}

/* Cases */
.cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}
.case {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px 22px;
  display: flex; flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
}
.case__strip {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 4px;
}
.case__tag {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.case__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 19px;
  margin: 0;
  line-height: 1.15;
}
.case__txt { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-2); }
.case__metric {
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--ink-4);
  letter-spacing: 0.04em;
  margin: 4px 0 0;
}

/* ============================================================
   HERO — full-bleed concept-map variant for index.html
============================================================ */
.hero--full {
  height: 100vh;
  min-height: 700px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 14px 0 16px;
  overflow: hidden;
}
.hero--full .hero__map {
  height: 100%;
  min-height: 0;
}
.hero--full .hero__map-wrap {
  flex: 1;
  min-height: 0;
  display: flex; flex-direction: column;
}
.hero__hint {
  margin: 6px 0 0;
  font-size: 12px;
  font-style: italic;
}

@media (max-width: 760px) {
  .hero--full {
    height: auto;
    min-height: 100vh;
  }
  .hero--full .hero__map { height: 480px; }
}

/* ============================================================
   BRANCH HERO — header at the top of each branch page
============================================================ */
.branch-hero {
  background: linear-gradient(180deg, #14131a 0%, #1d1c25 100%);
  color: #f4eedf;
  padding: 100px clamp(24px, 5vw, 80px) 70px;
  position: relative;
  overflow: hidden;
}
.branch-hero::before {
  content: '';
  position: absolute; inset: 0;
  pointer-events: none;
}
.branch-hero--fractal::before {
  background:
    radial-gradient(circle at 78% 22%, rgba(234,126,58,0.22), transparent 55%),
    radial-gradient(circle at 18% 78%, rgba(124,58,237,0.10), transparent 55%);
}
.branch-hero--tda::before {
  background:
    radial-gradient(circle at 78% 22%, rgba(124,58,237,0.28), transparent 55%),
    radial-gradient(circle at 18% 78%, rgba(230,57,144,0.12), transparent 55%);
}
.branch-hero--net::before {
  background:
    radial-gradient(circle at 78% 22%, rgba(15,181,196,0.26), transparent 55%),
    radial-gradient(circle at 18% 78%, rgba(234,126,58,0.10), transparent 55%);
}
.branch-hero__inner {
  position: relative;
  max-width: var(--col-bleed);
  margin: 0 auto;
}
.branch-hero__crumb {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px;
  color: rgba(244,238,223,0.55);
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}
.branch-hero__crumb a {
  color: rgba(244,238,223,0.85);
  border-bottom: 1px solid rgba(244,238,223,0.25);
  transition: border-color 160ms, color 160ms;
}
.branch-hero__crumb a:hover { color: #fff; border-bottom-color: #fff; }

.branch-hero__title {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: clamp(48px, 8vw, 102px);
  line-height: 0.96;
  letter-spacing: -0.025em;
  margin: 0 0 24px;
  text-wrap: balance;
}
.branch-hero__title em {
  font-family: var(--ff-display);
  font-style: italic;
  font-weight: 500;
}
.branch-hero--fractal .branch-hero__title em {
  background: linear-gradient(90deg, #ffd9a8 0%, #ea7e3a 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.branch-hero--tda .branch-hero__title em {
  background: linear-gradient(90deg, #c4b5fd 0%, #7c3aed 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.branch-hero--net .branch-hero__title em {
  background: linear-gradient(90deg, #67e8f9 0%, #0fb5c4 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

.branch-hero__sub {
  font-family: var(--ff-display);
  font-style: italic;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.45;
  color: rgba(244,238,223,0.75);
  max-width: 640px;
  margin: 0 0 36px;
}
.branch-hero__toc {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 10px;
  border-top: 1px solid rgba(244,238,223,0.12);
  padding-top: 28px;
}
.branch-hero__toc a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px;
  border: 1px solid rgba(244,238,223,0.18);
  border-radius: 99px;
  font-size: 13.5px;
  color: rgba(244,238,223,0.88);
  transition: background 160ms, border-color 160ms, color 160ms;
}
.branch-hero__toc a:hover {
  background: rgba(244,238,223,0.08);
  border-color: rgba(244,238,223,0.45);
  color: #fff;
}
.branch-hero__toc .mono {
  color: rgba(244,238,223,0.45);
  font-size: 11px;
}

/* ============================================================
   BRANCH NEXT — cards at the end of each branch page
============================================================ */
.branch-next {
  background: var(--bg-warm);
  padding: 70px clamp(24px, 5vw, 80px) 90px;
}
.branch-next__inner {
  max-width: var(--col-bleed);
  margin: 0 auto;
}
.branch-next__inner > .mono--dim {
  margin: 0 0 18px;
}
.branch-next__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.branch-next__card {
  display: flex; flex-direction: column; gap: 6px;
  padding: 26px 26px 28px;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  transition: transform 220ms cubic-bezier(.2,.7,.3,1), box-shadow 220ms, border-color 220ms;
}
.branch-next__card::after {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 100%; height: 4px;
  background: var(--ink-4);
}
.branch-next__card--orange::after { background: linear-gradient(90deg, #ffd9a8, #ea7e3a); }
.branch-next__card--violet::after { background: linear-gradient(90deg, #c4b5fd, #7c3aed); }
.branch-next__card--cyan::after   { background: linear-gradient(90deg, #67e8f9, #0fb5c4); }
.branch-next__card--home::after   { background: linear-gradient(90deg, #ea7e3a, #7c3aed, #0fb5c4); }

.branch-next__card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--ink-4);
}
.branch-next__card .mono {
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.branch-next__name {
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: 24px;
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: -0.015em;
}
.branch-next__sub {
  font-size: 14px;
  color: var(--ink-3);
  margin-top: 4px;
}

/* keep section--multifractal / section--tda from spanning full-bleed
   because they're inside <main>, not the top-level page anymore */
.section--multifractal { background: transparent; }
.section--tda          { background: transparent; }
.section--nature       { background: transparent; }
.section--map          { background: transparent; }

/* selection */
::selection { background: var(--violet); color: #fff; }