/* ============================================================
   Causal-Adapter — Redesigned v2
   Palette: Black/white hero, warm amber accent, cool grey surfaces
   Fonts:  DM Serif Display (titles), DM Sans (body)
   ============================================================ */

:root {
  --c-black:      #111111;
  --c-dark:       #1e1e1e;
  --c-grey-800:   #333333;
  --c-grey-600:   #555555;
  --c-grey-400:   #888888;
  --c-grey-200:   #d4d4d4;
  --c-grey-100:   #ebebeb;
  --c-surface:    #f6f6f4;
  --c-surface-alt:#eeeee9;
  --c-white:      #ffffff;
  --c-amber:      #d4853a;
  --c-amber-dark: #b5702e;
  --c-amber-light:#e8a35c;
  --c-amber-pale: #faf0e4;
  --c-teal:       #2a7c7c;
  --c-green:      #22c55e;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.04);
  --shadow-md:  0 4px 14px rgba(0,0,0,.07);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.10);
  --radius:     10px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --ease:       cubic-bezier(.4,0,.2,1);

  --font-title: 'DM Serif Display', Georgia, 'Times New Roman', serif;
  --font-body:  'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:  'JetBrains Mono', 'SF Mono', monospace;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  color: var(--c-dark);
  background: var(--c-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  margin: 0;
  overflow-x: hidden;
}

a { color: var(--c-amber-dark); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--c-amber); }

img { max-width: 100%; height: auto; }

/* ---- Section tag ---- */
.section-tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-amber);
  background: var(--c-amber-pale);
  padding: .3rem .9rem;
  border-radius: 100px;
  margin-bottom: .8rem;
}

/* ================================================================
   HERO — Clean white, black text, serif title
   ================================================================ */
.hero-section {
  padding: 5rem 1.5rem 2.5rem;
  text-align: center;
  background: var(--c-white);
  border-bottom: 1px solid var(--c-grey-100);
}

.hero-section .hero-eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-grey-400);
  margin-bottom: .8rem;
}

.hero-section h1 {
  font-family: var(--font-title);
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  font-weight: 400; /* DM Serif Display is already bold-ish */
  line-height: 1.25;
  color: var(--c-black);
  margin: 0 auto .5rem;
  max-width: 1100px;
}

.hero-section h1 .accent {
  color: var(--c-amber);
}

.hero-section h1 .title-sep {
  color: var(--c-grey-200);
}

.hero-subtitle {
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--c-grey-600);
  max-width: 640px;
  margin: 0 auto 1.8rem;
  line-height: 1.55;
  font-style: italic;
}

/* Authors */
.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .2rem .55rem;
  font-size: .92rem;
  margin-bottom: .5rem;
}
.authors a { color: var(--c-grey-800); font-weight: 500; }
.authors a:hover { color: var(--c-amber); }
.authors sup { font-size: .6em; margin-left: 1px; color: var(--c-amber); }

.affiliations {
  font-size: .82rem;
  color: var(--c-grey-400);
  margin-bottom: .3rem;
}
.affiliations sup { color: var(--c-amber); }

.equal-note {
  font-size: .76rem;
  color: var(--c-grey-400);
  font-style: italic;
}

/* Link pills */
.link-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .5rem;
  margin-top: 1.5rem;
}
.link-pills a {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1.1rem;
  font-size: .85rem;
  font-weight: 600;
  color: var(--c-dark);
  background: var(--c-white);
  border: 1.5px solid var(--c-grey-200);
  border-radius: 100px;
  transition: all .25s var(--ease);
}
.link-pills a:hover {
  background: var(--c-black);
  border-color: var(--c-black);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
}
.link-pills a i { font-size: .95rem; }

/* ================================================================
   TEASER — smaller image, balanced layout
   ================================================================ */
.teaser-section {
  padding: 3rem 2rem 2.5rem;
  background: var(--c-white);
}

.teaser-card {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: stretch;
  gap: 2.5rem;
}

.teaser-card .teaser-img {
  flex: 0 0 35%;
  max-width: 340px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  align-self: flex-start;
  display: block;
}

.teaser-card .teaser-text {
  flex: 1;
  font-size: 1rem;
  color: var(--c-grey-600);
  line-height: 1.75;
  overflow-y: auto;
  /* max-height set by JS to match image height */
}

.teaser-card .teaser-text strong {
  color: var(--c-dark);
}

@media (max-width: 768px) {
  .teaser-card { flex-direction: column; }
  .teaser-card .teaser-img { flex: none; width: 80%; max-width: none; margin: 0 auto; }
}

/* ================================================================
   HIGHLIGHTS (kept)
   ================================================================ */
.highlights-section {
  padding: 3rem 2rem 3.5rem;
  background: var(--c-surface);
}

.highlights-inner {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.highlights-inner h2 {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--c-black);
  margin-bottom: 1rem;
}

.highlights-tagline {
  font-size: 1rem;
  color: var(--c-grey-600);
  font-style: italic;
  margin-bottom: 1.5rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  text-align: left;
  margin-bottom: 1.8rem;
}

.highlight-card {
  background: var(--c-white);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.highlight-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.highlight-card .hc-icon {
  font-size: 1.2rem;
  margin-bottom: .35rem;
  color: var(--c-amber);
}
.highlight-card h4 {
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 700;
  color: var(--c-dark);
  margin: 0 0 .25rem;
}
.highlight-card p {
  font-size: .84rem;
  color: var(--c-grey-600);
  margin: 0;
  line-height: 1.5;
}

/* Abstract toggle */
.abstract-toggle {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem 1.1rem;
  font-size: .85rem;
  font-weight: 600;
  color: var(--c-dark);
  background: var(--c-white);
  border: 1.5px solid var(--c-grey-200);
  border-radius: 100px;
  cursor: pointer;
  transition: all .25s var(--ease);
  font-family: var(--font-body);
}
.abstract-toggle:hover {
  background: var(--c-dark);
  color: #fff;
  border-color: var(--c-dark);
}

.full-abstract {
  display: none;
  max-width: 780px;
  margin: 1.2rem auto 0;
  text-align: justify;
  font-size: .92rem;
  color: var(--c-grey-600);
  line-height: 1.75;
  padding: 1.2rem 1.5rem;
  background: var(--c-white);
  border-radius: var(--radius);
  border-left: 3px solid var(--c-amber);
}
.full-abstract.show { display: block; }

/* ================================================================
   DEMO — Interactive sliders with SVG causal graphs
   ================================================================ */
.demo-section {
  padding: 3.5rem 2rem;
  background: var(--c-white);
}

.demo-section h2 {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--c-black);
  text-align: center;
  margin-bottom: .5rem;
}

.demo-section .demo-subtitle {
  text-align: center;
  color: var(--c-grey-400);
  font-size: .92rem;
  max-width: 660px;
  margin: 0 auto 2rem;
}

.demo-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 1.2rem;
  max-width: 1100px;
  margin: 0 auto 2rem;
  align-items: stretch;
}

.demo-illustration {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: .5rem;
}

/* Causal graph cards (SVG) */
.causal-graph-card {
  width: 100%;
  max-width: 260px;
  background: var(--c-surface);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius-lg);
  padding: 1rem 1rem .8rem;
  text-align: center;
}
.cg-title {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--c-dark);
  margin-bottom: .5rem;
}
.cg-svg {
  width: 100%;
  max-width: 200px;
  margin: 0 auto;
  display: block;
}
.cg-node {
  fill: var(--c-white);
  stroke: var(--c-grey-200);
  stroke-width: 2;
}
.cg-node-accent {
  fill: var(--c-amber-pale);
  stroke: var(--c-amber);
  stroke-width: 2.5;
}
.cg-label {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  fill: var(--c-dark);
  text-anchor: middle;
  dominant-baseline: middle;
}
.cg-edge {
  stroke: var(--c-grey-400);
  stroke-width: 1.5;
  fill: none;
}
.cg-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .2rem .8rem;
  margin-top: .5rem;
  font-size: .68rem;
  color: var(--c-grey-400);
}
.cg-legend strong {
  color: var(--c-grey-600);
}

/* Demo cards */
.demo-card {
  background: var(--c-surface);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius-lg);
  padding: 1rem 1.2rem 0.8rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  transition: box-shadow .3s var(--ease);
}
.demo-card:hover {
  box-shadow: var(--shadow-md);
}

.demo-card .demo-question {
  font-size: .86rem;
  color: var(--c-grey-600);
  text-align: center;
  margin-bottom: .8rem;
  min-height: 2.4em;
  line-height: 1.45;
}
.demo-card .demo-question .hl {
  background: var(--c-amber-pale);
  color: var(--c-amber-dark);
  font-weight: 600;
  padding: .1rem .4rem;
  border-radius: 5px;
}

.demo-card .demo-preview {
  width: 100%;
  max-width: 180px;
  aspect-ratio: 1/1;
  object-fit: contain;
  border-radius: var(--radius);
  margin-bottom: .6rem;
}

/* Slider */
.demo-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 5px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-grey-200) 0%, var(--c-amber) 100%);
  outline: none;
  opacity: .85;
  transition: opacity .2s;
}
.demo-slider:hover { opacity: 1; }
.demo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--c-white);
  border: 2.5px solid var(--c-amber);
  cursor: pointer;
  box-shadow: 0 1px 5px rgba(0,0,0,.12);
  transition: transform .15s;
}
.demo-slider::-webkit-slider-thumb:hover { transform: scale(1.15); }
.demo-slider::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--c-white);
  border: 2.5px solid var(--c-amber);
  cursor: pointer;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: .2rem;
  font-size: .7rem;
  color: var(--c-grey-400);
}

@media (max-width: 900px) {
  .demo-row {
    grid-template-columns: 1fr;
    max-width: 420px;
  }
}

/* ================================================================
   INSIGHTS — Motivation & Comparison (Tabbed)
   ================================================================ */
.insights-section {
  padding: 3rem 2rem 3.5rem;
  background: var(--c-surface);
}

.insights-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.insights-inner h2 {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--c-black);
  margin-bottom: 1.2rem;
}

/* Tabs */
.insight-tabs {
  display: flex;
  justify-content: center;
  gap: .5rem;
  margin-bottom: 1.5rem;
}
.insight-tab {
  font-family: var(--font-body);
  font-size: .88rem;
  font-weight: 600;
  padding: .5rem 1.3rem;
  border: 1.5px solid var(--c-grey-200);
  border-radius: 100px;
  background: var(--c-white);
  color: var(--c-grey-600);
  cursor: pointer;
  transition: all .25s var(--ease);
}
.insight-tab:hover {
  border-color: var(--c-grey-400);
  color: var(--c-dark);
}
.insight-tab.active {
  background: var(--c-dark);
  border-color: var(--c-dark);
  color: #fff;
}

/* Panels */
.insight-panel { display: none; }
.insight-panel.active { display: block; }

.insight-split {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  text-align: left;
}

.insight-figure {
  background: var(--c-white);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.insight-figure img {
  width: 100%;
  display: block;
}

.insight-explain {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.insight-point {
  background: var(--c-white);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  transition: box-shadow .3s var(--ease);
}
.insight-point:hover {
  box-shadow: var(--shadow-md);
}

.insight-point-tag {
  display: inline-block;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--c-amber);
  background: var(--c-amber-pale);
  padding: .15rem .55rem;
  border-radius: 4px;
  margin-bottom: .35rem;
}

.insight-point h4 {
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 700;
  color: var(--c-dark);
  margin: 0 0 .2rem;
}

.insight-point p {
  font-size: .84rem;
  color: var(--c-grey-600);
  margin: 0;
  line-height: 1.5;
}

@media (max-width: 768px) {
  .insight-split { flex-direction: column; }
  .insight-explain { grid-template-columns: 1fr; }
}

/* ================================================================
   METHOD — Three-stage pipeline
   ================================================================ */
.method-section {
  padding: 3rem 2rem 3.5rem;
  background: var(--c-white);
}

.method-section h2 {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--c-black);
  text-align: center;
  margin-bottom: .3rem;
}

.method-subtitle {
  text-align: center;
  color: var(--c-grey-400);
  font-size: .92rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.method-figure-wrap {
  max-width: 1000px;
  margin: 0 auto 2rem;
  background: var(--c-surface);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  position: relative;
}
.method-figure-wrap .method-fig {
  width: 100%;
  display: block;
}

/* Method highlight overlays */
.method-highlight {
  position: absolute;
  border: 3px solid var(--c-amber);
  background: rgba(212, 133, 58, 0.10);
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity .35s var(--ease);
  pointer-events: none;
}
.method-highlight.active {
  opacity: 1;
}

/* Three stages */
.method-stages {
  display: flex;
  align-items: flex-start;
  gap: 0;
  max-width: 1060px;
  margin: 0 auto 1.5rem;
}

.method-stage {
  flex: 1;
  background: var(--c-surface);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius-lg);
  padding: 1.2rem 1.3rem;
  position: relative;
  cursor: default;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.method-stage:hover {
  border-color: var(--c-amber);
  box-shadow: var(--shadow-md);
}

/* Hover hint badge */
.method-stage[data-highlight]::after {
  content: '⬆ hover to highlight';
  display: block;
  margin-top: .75rem;
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-align: center;
  color: var(--c-amber);
  opacity: .7;
  transition: opacity .2s var(--ease);
}
.method-stage[data-highlight]:hover::after {
  opacity: 0;
}

.stage-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--c-amber);
  color: #fff;
  font-family: var(--font-title);
  font-size: .95rem;
  margin-bottom: .6rem;
}

.stage-content h4 {
  font-family: var(--font-body);
  font-size: .92rem;
  font-weight: 700;
  color: var(--c-dark);
  margin: 0 0 .3rem;
}

.stage-content p {
  font-size: .82rem;
  color: var(--c-grey-600);
  margin: 0;
  line-height: 1.55;
}

.stage-connector {
  flex: 0 0 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-grey-200);
  font-size: 1.2rem;
  padding-top: 2rem;
}

.method-inference {
  text-align: center;
  font-size: .9rem;
  color: var(--c-grey-600);
  max-width: 780px;
  margin: 0 auto;
  line-height: 1.6;
}
.method-inference strong {
  color: var(--c-dark);
}

@media (max-width: 768px) {
  .method-stages { flex-direction: column; gap: .8rem; }
  .stage-connector { transform: rotate(90deg); padding-top: 0; }
}

/* ================================================================
   RESULTS — Experiment cards
   ================================================================ */
.results-section {
  padding: 3rem 2rem 3.5rem;
  background: var(--c-surface);
}

.results-inner {
  max-width: 1060px;
  margin: 0 auto;
  text-align: center;
}

.results-inner h2 {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--c-black);
  margin-bottom: .5rem;
}

.results-subtitle {
  font-size: .92rem;
  color: var(--c-grey-400);
  margin-bottom: 2rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
  text-align: left;
  margin-bottom: 1.5rem;
}

.result-card {
  background: var(--c-white);
  border: 1px solid var(--c-grey-100);
  border-radius: var(--radius-lg);
  padding: 1.3rem 1.4rem;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.result-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.result-dataset {
  font-family: var(--font-body);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c-amber);
  margin-bottom: .6rem;
}

.result-metric-row {
  display: flex;
  gap: 1.2rem;
  margin-bottom: .6rem;
}

.result-metric {
  display: flex;
  flex-direction: column;
}

.result-value {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--c-dark);
  line-height: 1.1;
}

.result-label {
  font-size: .7rem;
  color: var(--c-grey-400);
  font-weight: 500;
}

.result-detail {
  font-size: .82rem;
  color: var(--c-grey-600);
  margin: 0;
  line-height: 1.5;
}

.results-note {
  font-size: .78rem;
  color: var(--c-grey-400);
}
.results-note strong {
  color: var(--c-grey-600);
}

/* ================================================================
   BIBTEX
   ================================================================ */
.bibtex-section {
  padding: 2.5rem 2rem;
  background: var(--c-white);
}

.bibtex-section h2 {
  font-family: var(--font-title);
  font-size: 1.3rem;
  color: var(--c-black);
  margin-bottom: 0;
}

.bibtex-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.bibtex-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: .75rem;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .4rem .9rem;
  font-family: var(--font-body);
  font-size: .8rem;
  font-weight: 600;
  color: var(--c-dark);
  background: var(--c-white);
  border: 1.5px solid var(--c-grey-200);
  border-radius: 100px;
  cursor: pointer;
  transition: all .25s var(--ease);
}
.copy-btn:hover { background: var(--c-dark); color: #fff; border-color: var(--c-dark); }
.copy-btn.copied { background: var(--c-green); border-color: var(--c-green); color: #fff; }

pre.bibtex-code {
  background: var(--c-surface) !important;
  border: 1px solid var(--c-grey-100) !important;
  border-radius: var(--radius) !important;
  padding: 1.1rem 1.3rem !important;
  font-size: .82rem !important;
  line-height: 1.6 !important;
  overflow-x: auto;
  color: var(--c-dark) !important;
  font-family: var(--font-mono) !important;
}

/* ================================================================
   FOOTER — Clean white, matching hero
   ================================================================ */
.site-footer {
  padding: 2rem 2rem;
  background: var(--c-white);
  border-top: 1px solid var(--c-grey-100);
  text-align: center;
}

.footer-inner {
  max-width: 700px;
  margin: 0 auto;
}

.footer-title {
  font-family: var(--font-title);
  font-size: 1.15rem;
  color: var(--c-black);
  margin-bottom: .4rem;
}

.site-footer p {
  font-size: .85rem;
  color: var(--c-grey-600);
  margin: 0 0 .3rem;
  line-height: 1.5;
}

.site-footer a {
  color: var(--c-amber-dark);
  font-weight: 500;
}
.site-footer a:hover { color: var(--c-amber); }

.footer-credit {
  font-size: .75rem !important;
  color: var(--c-grey-400) !important;
  margin-top: .5rem !important;
}

/* ================================================================
   SCROLL-TO-TOP
   ================================================================ */
.scroll-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 42px; height: 42px;
  background: var(--c-dark);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all .3s var(--ease);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  box-shadow: var(--shadow-md);
}
.scroll-to-top:hover { background: var(--c-amber); transform: translateY(-2px); }
.scroll-to-top.visible { opacity: 1; visibility: visible; }

/* ================================================================
   ANIMATIONS
   ================================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .55s var(--ease) both; }
.stagger > *:nth-child(1) { animation-delay: .04s; }
.stagger > *:nth-child(2) { animation-delay: .08s; }
.stagger > *:nth-child(3) { animation-delay: .12s; }
.stagger > *:nth-child(4) { animation-delay: .16s; }
.stagger > *:nth-child(5) { animation-delay: .2s; }
.stagger > *:nth-child(6) { animation-delay: .24s; }

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 600px) {
  .hero-section { padding: 3rem 1rem 2rem; }
  .hero-section h1 { font-size: 1.7rem; }
  .authors { font-size: .82rem; }
  .link-pills a { padding: .4rem .8rem; font-size: .8rem; }
  .highlight-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .insight-tabs { flex-direction: column; align-items: center; }
}