
/* ========================================================================
   Marcelo Manucci — Refined editorial aesthetic
   Three variants switchable via data-variant on <body>:
     A — Editorial Silencioso (ivory, serif/sans, very restrained)
     B — Estructural Académico (paper-white, denser grid, mono-led)
     C — Contemporáneo Editorial (warm bone, larger type, dramatic rule)
   ======================================================================== */

:root {
  /* ---- Shared scale ---- */
  --fs-label:    0.72rem;
  --fs-body:     1.0625rem;
  --fs-small:    0.9rem;
  --lh-body:     1.75;

  --max-prose:   680px;
  --max-wide:    1040px;
  --page-pad-x:  clamp(1.5rem, 5vw, 4rem);

  --ease:        cubic-bezier(0.2, 0.6, 0.2, 1);

  /* ---- Variant A: Editorial Silencioso (default) ---- */
  --ivory:        #F5F2EC;
  --ivory-deep:   #EDE8DE;
  --ink:          #1B1F2A;
  --ink-soft:     #3A3F4D;
  --ink-muted:    #7A7F8C;
  --rule:         #D9D4C8;
  --rule-faint:   #E6E1D6;
  --blue:         #2A3B55;   /* desaturated, restrained */
  --accent:       #9B3A31;   /* desaturated earth red */
  --accent-soft:  rgba(155, 58, 49, 0.5);

  --font-sans: "Instrument Sans", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --font-serif:"Instrument Serif", Georgia, serif;
}

/* --------- Variant B: Estructural Académico (paper, denser) --------- */
body[data-variant="B"] {
  --ivory:        #F4F2ED;
  --ivory-deep:   #EAE7E0;
  --ink:          #141821;
  --ink-soft:     #2E3340;
  --ink-muted:    #767C8A;
  --rule:         #CFC9BD;
  --rule-faint:   #E2DDD1;
  --blue:         #1F2F48;
  --accent:       #8C2E26;
}

/* --------- Variant C: Contemporáneo Editorial (warm bone, larger) --------- */
body[data-variant="C"] {
  --ivory:        #EDEAE2;     /* warmer, deeper bone */
  --ivory-deep:   #E3DFD3;
  --ink:          #101218;
  --ink-soft:     #33384A;
  --ink-muted:    #6E7482;
  --rule:         #C9C3B4;
  --rule-faint:   #D8D3C4;
  --blue:         #1F3A4D;    /* petrol blue */
  --accent:       #A23A30;
}

/* ---------------- Reset ---------------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: var(--lh-body);
  color: var(--ink-soft);
  background: var(--ivory);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  letter-spacing: -0.003em;
}

img { max-width: 100%; display: block; }

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s var(--ease), opacity 0.3s var(--ease);
}

::selection { background: var(--accent); color: var(--ivory); }

/* ---------------- Type ---------------- */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.4rem, 5.2vw, 4rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(1.55rem, 2.4vw, 2rem);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.022em;
  color: var(--ink);
  margin-bottom: 2.5rem;
}

.prose h2 {
  margin-bottom: 2.75rem;
}
.prose h2 em {
  color: var(--blue);
  font-style: normal;
}
body[data-variant="C"] .prose h2 em {
  color: var(--blue);
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 500;
}

.band h2 {
  margin-bottom: 2.5rem;
}

h3 {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: -0.01em;
}

p { margin-bottom: 1.4em; color: var(--ink-soft); text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

.label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 2rem;
  display: inline-block;
}
.label .dot {
  color: var(--accent);
  margin: 0 0.55em;
  opacity: 0.9;
  font-size: 0.85em;
  vertical-align: middle;
}

/* Variant B: labels even more technical */
body[data-variant="B"] .label {
  font-size: 0.68rem;
  letter-spacing: 0.18em;
}

/* Variant C: mixes serif italic into a few accents (OFF by default — per user request) */
body[data-variant="C"] h1 em,
body[data-variant="C"] h2 em {
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 400;
  color: var(--blue);
  letter-spacing: -0.02em;
}

/* ---------------- Layout primitives ---------------- */
.prose {
  max-width: var(--max-prose);
  margin: 0 auto;
}

.wide {
  max-width: var(--max-wide);
  margin: 0 auto;
}

/* ---------------- Navigation ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--ivory) 85%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.nav.is-scrolled {
  background: var(--blue);
  border-bottom-color: var(--blue);
}
.nav.is-scrolled .nav-logo,
.nav.is-scrolled .nav-links a,
.nav.is-scrolled .nav-links a.active {
  color: color-mix(in oklab, var(--ivory) 88%, transparent);
}
.nav.is-scrolled .nav-links a:hover,
.nav.is-scrolled .nav-links a.active {
  color: var(--ivory);
}

.nav-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 1.35rem var(--page-pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: 2.25rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  position: relative;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 400;
  color: var(--ink-muted);
  letter-spacing: 0.005em;
  padding: 0.25rem 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-links a.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

/* ---------------- HERO ---------------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: 8rem var(--page-pad-x) 6rem;
  overflow: hidden;
  background: var(--ivory);
}

.hero-mark {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.hero-mark svg {
  position: absolute;
  right: -6%;
  top: 50%;
  transform: translateY(-50%);
  height: 140%;
  width: auto;
  color: var(--ink);
  opacity: 0.045;
}
.hero-mark svg path {
  stroke: currentColor;
  stroke-width: 1.4;
  fill: none;
  vector-effect: non-scaling-stroke;
}

/* Variant C: mark slightly more present, warmer */
body[data-variant="C"] .hero-mark svg {
  right: -10%;
  height: 160%;
  opacity: 0.06;
  color: var(--blue);
}
body[data-variant="C"] .hero-mark svg path { stroke-width: 1.1; }

/* Variant B: even quieter, more to edge */
body[data-variant="B"] .hero-mark svg {
  right: 0;
  height: 110%;
  opacity: 0.035;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-wide);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.hero-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.hero-top .hero-meta-right { text-align: right; }
.hero-top .hero-meta-right span { color: var(--ink); }

.hero-body {
  max-width: 940px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 2.25rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}
.hero-eyebrow .bullet {
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.hero h1 {
  color: var(--ink);
  max-width: 18ch;
  margin-bottom: 2rem;
}

/* Variant A — quiet treatment of H1 with a final accented glyph */
body[data-variant="A"] .hero h1 .accent {
  color: var(--accent);
  font-style: normal;
}

/* Variant B — H1 denser, set in full caps accent number */
body[data-variant="B"] .hero h1 {
  font-weight: 500;
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  letter-spacing: -0.028em;
}

/* Variant C — editorial, larger, italic accent */
body[data-variant="C"] .hero h1 {
  font-size: clamp(2.8rem, 6.4vw, 5rem);
  line-height: 1.0;
  letter-spacing: -0.04em;
  font-weight: 400;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 48ch;
  font-weight: 400;
  letter-spacing: -0.005em;
  margin-top: 2rem;
  padding-top: 2rem;
  position: relative;
}
.hero-subtitle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 1px;
  background: var(--accent);
}

body[data-variant="B"] .hero-subtitle {
  font-family: var(--font-sans);
  max-width: 52ch;
}
body[data-variant="C"] .hero-subtitle {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: clamp(1.15rem, 1.55vw, 1.35rem);
  line-height: 1.5;
  max-width: 48ch;
  color: var(--blue);
}

/* ---------------- Sections ---------------- */
.section {
  padding: clamp(5rem, 10vw, 9rem) var(--page-pad-x);
  position: relative;
}

.section--tight { padding-top: clamp(4rem, 7vw, 6rem); padding-bottom: clamp(4rem, 7vw, 6rem); }

.section--alt {
  background: var(--ivory-deep);
}

.section-head {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2.5rem;
  align-items: baseline;
  max-width: var(--max-prose);
  margin: 0 auto 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule-faint);
}
.section-head .section-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 0.25rem;
}
.section-head .section-wordmark {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  text-transform: lowercase;
  font-weight: 500;
  color: var(--blue);
  padding-top: 0;
}

/* ---------------- Transition band (between dark hero and body) - now a quiet band of ivory-deep ---------------- */
.band {
  background: var(--ivory-deep);
  padding: clamp(4.5rem, 7vw, 7rem) var(--page-pad-x);
  border-top: 1px solid var(--rule-faint);
  border-bottom: 1px solid var(--rule-faint);
}

.band-inner {
  max-width: var(--max-prose);
  margin: 0 auto;
}

.band h2 {
  font-size: clamp(1.4rem, 2.1vw, 1.8rem);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin-bottom: 2.75rem;
}

body[data-variant="C"] .band h2 em {
  color: var(--blue);
  font-style: normal;
  font-family: var(--font-sans);
}

/* ---------------- Editorial numbered list (replaces card-finding) ---------------- */
.findings {
  max-width: var(--max-prose);
  margin: 3.5rem auto 0;
  list-style: none;
}

.finding {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 2.5rem;
  padding: 2.75rem 0;
  border-top: 1px solid var(--rule-faint);
  align-items: baseline;
}
.finding:last-child { border-bottom: 1px solid var(--rule-faint); }

.finding:hover .finding-num { color: var(--accent); }
.finding .finding-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  padding-top: 0.45rem;
  transition: color 0.3s var(--ease);
  white-space: nowrap;
}

.finding-body h3 {
  margin-bottom: 0.85rem;
  font-size: 1.1rem;
  color: var(--ink);
}

.finding-body p {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
  max-width: 56ch;
}

/* Variant B — tighter, more technical */
body[data-variant="B"] .finding {
  padding: 2rem 0;
  grid-template-columns: 90px 1fr;
  gap: 1.75rem;
}
body[data-variant="B"] .finding-body p { font-size: 0.94rem; }

/* Variant C — roomier, display number in blue petrol */
body[data-variant="C"] .finding {
  padding: 3.5rem 0;
  grid-template-columns: 120px 1fr;
}
body[data-variant="C"] .finding-num {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--blue);
  padding-top: 0.45rem;
  line-height: 1.3;
}

/* ---------------- Lab block (centered intro) ---------------- */
.lab {
  text-align: left;
  max-width: var(--max-prose);
  margin: 0 auto;
}
.lab h2 { margin-bottom: 2.5rem; }
.lab p { color: var(--ink-soft); max-width: 60ch; margin: 0; }

/* Variant C: lab h2 — same sans, blue petrol */
body[data-variant="C"] .lab h2 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-style: normal;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
  color: var(--blue);
}
body[data-variant="C"] .lab h2 em {
  color: var(--blue);
  font-family: var(--font-sans);
  font-style: normal;
}

/* ---------------- Bridge + nav cards (editorial links) ---------------- */
.nav-cards {
  max-width: var(--max-prose);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--rule-faint);
  border-bottom: 1px solid var(--rule-faint);
}

.nav-card {
  padding: 2.75rem 2rem 2.75rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  border-right: 1px solid var(--rule-faint);
  transition: background 0.3s var(--ease);
  cursor: pointer;
  position: relative;
}
.nav-card:last-child { border-right: none; padding-right: 0; padding-left: 2rem; }
.nav-card:hover { background: color-mix(in oklab, var(--accent) 4%, transparent); }

.nav-card .nav-card-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.nav-card h3 {
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.nav-card p {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 36ch;
}
.nav-card .nav-card-link {
  margin-top: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.nav-card .nav-card-link svg {
  width: 14px; height: 14px;
  transition: transform 0.35s var(--ease);
}
.nav-card:hover .nav-card-link svg { transform: translateX(4px); }

/* Variant C — nav card headings in blue petrol, sans */
body[data-variant="C"] .nav-card h3 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-style: normal;
  letter-spacing: -0.02em;
  color: var(--blue);
}

/* ---------------- Thesis section ---------------- */
.thesis {
  position: relative;
  overflow: hidden;
}

/* Butterfly watermark between findings 01 and 02 — same config as hero-mark */
.findings-mark {
  position: relative;
  display: block;
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--rule-faint);
  height: clamp(180px, 26vw, 320px);
  overflow: hidden;
  pointer-events: none;
}
.findings-mark svg {
  position: absolute;
  right: -8%;
  top: 50%;
  transform: translateY(-50%);
  width: 55%;
  height: auto;
  color: var(--ink);
  opacity: 0.055;
  fill: currentColor;
  display: block;
}
body[data-variant="C"] .findings-mark svg {
  right: -8%;
  width: 60%;
  opacity: 0.08;
  color: var(--blue);
}
body[data-variant="B"] .findings-mark svg {
  right: -2%;
  width: 45%;
  opacity: 0.04;
}

/* ---------------- Footer ---------------- */
footer {
  background: var(--blue);
  color: color-mix(in oklab, var(--ivory) 80%, transparent);
  padding: clamp(4rem, 7vw, 6rem) var(--page-pad-x) 2.5rem;
  margin-top: 0;
}

.footer-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-col { display: flex; flex-direction: column; gap: 0.7rem; }

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ivory);
  margin: 0 0 0.9rem;
  opacity: 0.7;
}

.footer-col a {
  font-size: 0.88rem;
  color: color-mix(in oklab, var(--ivory) 65%, transparent);
  transition: color 0.3s var(--ease);
}
.footer-col a:hover { color: var(--ivory); }
.footer-col--nolabel h4 { visibility: hidden; }

.footer-social-row { display: flex; gap: 1rem; margin-top: 0.25rem; }
.footer-social { padding: 4px 0; opacity: 0.65; }
.footer-social:hover { opacity: 1; }
.footer-social svg { width: 18px; height: 18px; fill: currentColor; display: block; }

.footer-bottom {
  max-width: var(--max-wide);
  margin: 2rem auto 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: color-mix(in oklab, var(--ivory) 45%, transparent);
  text-transform: uppercase;
}

/* ---------------- Fade-in ---------------- */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 1.1s var(--ease), transform 1.1s var(--ease);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
}

/* ---------------- Tweaks panel ---------------- */
.tweaks-panel {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  background: var(--ivory);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 1.25rem 1.25rem 1rem;
  min-width: 240px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  display: none;
  font-family: var(--font-sans);
}
.tweaks-panel.is-visible { display: block; }
.tweaks-panel h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
  margin-bottom: 1rem;
}
.tweaks-options { display: flex; flex-direction: column; gap: 0.4rem; }
.tweaks-opt {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--ink-soft);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
  text-align: left;
  background: transparent;
  width: 100%;
}
.tweaks-opt:hover { background: var(--ivory-deep); }
.tweaks-opt.is-active {
  border-color: var(--rule);
  background: var(--ivory-deep);
  color: var(--ink);
}
.tweaks-opt .tw-letter {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  flex-shrink: 0;
  padding-top: 2px;
}
.tweaks-opt .tw-name { font-weight: 500; display: block; line-height: 1.2; }
.tweaks-opt .tw-desc { font-size: 0.75rem; color: var(--ink-muted); display: block; line-height: 1.35; margin-top: 2px; }

/* ---------------- Mobile nav toggle (hamburger) ---------------- */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  position: relative;
  color: var(--ink);
  z-index: 60;
}
.nav-toggle-bar {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease), top 0.3s var(--ease);
}
.nav-toggle-bar:nth-child(1) { top: 16px; }
.nav-toggle-bar:nth-child(2) { top: 22px; }
.nav-toggle-bar:nth-child(3) { top: 28px; }
.nav-toggle.is-open .nav-toggle-bar:nth-child(1) { top: 22px; transform: rotate(45deg); }
.nav-toggle.is-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.is-open .nav-toggle-bar:nth-child(3) { top: 22px; transform: rotate(-45deg); }
.nav.is-scrolled .nav-toggle { color: var(--ivory); }
/* When menu is open, toggle always on the navy panel → force ivory */
.nav-toggle.is-open { color: var(--ivory); }

/* ---------------- Responsive ---------------- */

/* Tablet + small laptop */
@media (max-width: 960px) {
  :root { --page-pad-x: 1.75rem; }
  .section-head { grid-template-columns: 1fr; gap: 0.75rem; }
  .finding { grid-template-columns: 1fr; gap: 0.5rem; padding: 2rem 0; }
  .nav-cards { grid-template-columns: 1fr; }
  .nav-card, .nav-card:last-child { border-right: none; border-bottom: 1px solid var(--rule-faint); padding: 2rem 0; }
  .nav-card:last-child { border-bottom: none; }
  .footer-inner { grid-template-columns: repeat(2, 1fr); column-gap: 2rem; row-gap: 2.5rem; }
}

/* Tablet portrait / large phone */
@media (max-width: 720px) {
  :root { --page-pad-x: 1.5rem; }

  /* Nav → hamburger */
  .nav-toggle { display: block; }
  .nav-inner { padding: 1.1rem var(--page-pad-x); }
  .nav-logo { font-size: 0.9rem; white-space: nowrap; }
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    background: #F5F2EC;
    background-color: var(--ivory);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0;
    padding: 5rem 1.75rem 2rem;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease);
    pointer-events: none;
    list-style: none;
    margin: 0;
    z-index: 55;
    overflow-y: auto;
  }
  .nav-links.is-open {
    transform: translateX(0);
    pointer-events: auto;
  }
  body[data-variant="B"] .nav-links { background: #F4F2ED; background-color: var(--ivory); }
  body[data-variant="C"] .nav-links { background: #EDEAE2; background-color: var(--ivory); }
  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--rule-faint);
  }
  .nav-links a {
    display: block;
    padding: 1.15rem 0;
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--ink);
    letter-spacing: -0.01em;
  }
  .nav-links a.active::before { display: none; }
  .nav-links a.active { color: var(--accent); }
  /* When scrolled-on-blue, menu overlay stays ivory (readable) */
  .nav.is-scrolled .nav-links { background: var(--ivory); }
  .nav.is-scrolled .nav-links a { color: var(--ink); }
  .nav.is-scrolled .nav-links a.active { color: var(--accent); }

  body.nav-open { overflow: hidden; }

  /* Hero */
  .hero {
    min-height: auto;
    padding: 7rem var(--page-pad-x) 4rem;
  }
  .hero h1 { font-size: clamp(2.25rem, 10vw, 3.2rem); line-height: 1.05; }
  .hero-subtitle { font-size: 1.05rem; }
  .hero-top { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .hero-top .hero-meta-right { text-align: left; }
  .hero-eyebrow { font-size: 0.66rem; flex-wrap: wrap; }

  /* GLOBAL: all side-label grids collapse to stacked (label above content) on mobile */
  .section-head,
  .finding,
  body[data-variant="B"] .finding,
  body[data-variant="C"] .finding,
  .trajectory > li,
  body[data-variant="C"] .trajectory > li,
  .properties,
  .regimes,
  .duo,
  .bio-split,
  .bio-meta,
  .credentials,
  .teaching-grid,
  .book-entry {
    grid-template-columns: 1fr !important;
    gap: 0.6rem;
  }
  .trajectory > li,
  .finding { padding: 1.75rem 0; }
  .traj-label,
  .finding-num,
  .prop-label,
  .regime-num,
  .duo-label,
  .section-num,
  .book-year { display: block; margin-bottom: 0.25rem; }
  .traj-label br { display: none; }

  /* Footer — 2 cols clean */
  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
    padding: 3.5rem var(--page-pad-x) 2rem;
    column-gap: 1.5rem;
    row-gap: 2.25rem;
  }
  .footer-col h4 { font-size: 0.62rem; }
  .footer-col a { font-size: 0.9rem; padding: 0.15rem 0; }
  .footer-bottom {
    padding: 1.5rem var(--page-pad-x) 2rem;
    font-size: 0.75rem;
  }

  /* Section paddings */
  section { padding-left: var(--page-pad-x); padding-right: var(--page-pad-x); }
  h2 { font-size: clamp(1.6rem, 6vw, 2.2rem); }
}

/* Small phone */
@media (max-width: 380px) {
  :root { --page-pad-x: 1.25rem; }

  .hero { padding-top: 6rem; padding-bottom: 3rem; }
  .hero h1 { font-size: clamp(2rem, 11vw, 2.75rem); }
  .hero-subtitle { font-size: 0.98rem; line-height: 1.5; }

  /* Footer: keep 2 cols even on small phones (user prefers grid over long list) */
  .footer-inner {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 1.25rem;
    row-gap: 2rem;
    padding: 3rem var(--page-pad-x) 1.75rem;
  }
  .footer-col h4 { font-size: 0.6rem; }
  .footer-col a { font-size: 0.82rem; }
  .footer-col--nolabel h4 { display: none; }
  .footer-bottom {
    flex-direction: column;
    gap: 0.4rem;
    align-items: flex-start;
  }

  /* Tighter body copy */
  p { font-size: 1rem; line-height: 1.6; }
}
