:root {
  /* Palette anchored on the RuNNer logo navy (#00355f).
     A slightly lifted navy on top settles to deep ink at the bottom. */
  --bg: #0c4a7a;
  --bg-mid: #00355f;
  --bg-deep: #001a30;
  --bg-card: #052a4a;
  --accent: #f9d3c5;
  --accent-2: #c8a2ff;
  --accent-3: #a8d4a0;
  --logo-navy: #00355f;
  --text: #ecebff;
  --text-soft: rgba(236, 235, 255, 0.78);
  --text-dim: rgba(236, 235, 255, 0.52);
  --card: rgba(255, 255, 255, 0.055);
  --card-strong: rgba(255, 255, 255, 0.095);
  --hairline: rgba(255, 255, 255, 0.12);
  --hairline-strong: rgba(255, 255, 255, 0.22);
  --code-bg: rgba(15, 16, 40, 0.55);
  font-family: 'Manrope', system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background:
    radial-gradient(1200px 700px at 78% -8%, color-mix(in oklab, var(--accent-2) 14%, transparent), transparent 60%),
    radial-gradient(900px 600px at -10% 18%, color-mix(in oklab, var(--accent) 10%, transparent), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-mid) 38%, var(--bg-deep) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

code, pre, .mono { font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace; }

.page { max-width: 100%; overflow-x: clip; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 40px;
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(0, 26, 48, 0.85), rgba(0, 26, 48, 0.55));
  border-bottom: 1px solid var(--hairline);
}
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.logo-img {
  height: 40px; width: auto; display: block;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.25));
}
.logo-text { font-weight: 700; font-size: 22px; letter-spacing: -0.01em; color: var(--text); }
.logo-accent { color: var(--accent); }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  color: var(--text-soft); text-decoration: none; font-size: 14px; font-weight: 500;
  transition: color .2s;
}
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; gap: 10px; align-items: center; }
.nav-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: 999px; font-size: 13px; font-weight: 600;
  text-decoration: none; color: var(--bg-deep); background: var(--accent);
  border: 1px solid transparent; transition: transform .2s, background .2s;
}
.nav-pill:hover { transform: translateY(-1px); }
.nav-pill.ghost {
  background: transparent; color: var(--text); border-color: var(--hairline-strong);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 90px 40px 110px;
  display: grid; place-items: center;
  text-align: left;
}
.hero-inner { max-width: 1100px; width: 100%; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent);
  padding: 6px 14px; border-radius: 999px;
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 28%, transparent);
  text-decoration: none;
  transition: transform .2s, background .2s;
}
.eyebrow:hover { transform: translateY(-1px); background: color-mix(in oklab, var(--accent) 18%, transparent); }
.eyebrow-arrow { opacity: 0.7; }
.eyebrow-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 30%, transparent);
}
.hero h1 {
  font-size: clamp(36px, 7vw, 92px); line-height: 1.02; letter-spacing: -0.025em;
  margin: 22px 0 16px; font-weight: 700;
  text-wrap: balance;
  overflow-wrap: break-word;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--accent), var(--accent-2) 60%, var(--accent-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead {
  font-size: clamp(16px, 1.4vw, 20px); color: var(--text-soft); max-width: 680px;
  margin: 0 0 30px; text-wrap: pretty;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px; border-radius: 999px; font-weight: 600; font-size: 15px;
  text-decoration: none; transition: transform .2s, background .2s;
}
.btn.primary { background: var(--accent); color: var(--bg-deep); }
.btn.primary:hover { transform: translateY(-1px); }
.btn.ghost {
  background: transparent; color: var(--text); border: 1px solid var(--hairline-strong);
}
.btn.ghost:hover { background: var(--card); }
.hero-meta {
  margin-top: 64px;
  display: grid; grid-template-columns: repeat(3, max-content); gap: 56px;
}
.hero-meta > div { display: flex; flex-direction: column; gap: 4px; }
.meta-num { font-size: 28px; font-weight: 700; color: var(--text); }
.meta-lbl { font-size: 12px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; }
.hero-scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 10px;
  font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--text-dim);
}

/* ---------- Generations (scroll-pinned) ---------- */
.gens-wrap {
  position: relative;
  height: 600vh;
  background:
    radial-gradient(60% 50% at 50% 30%, color-mix(in oklab, var(--accent-2) 8%, transparent), transparent 70%);
}
.gens {
  position: sticky; top: 0;
  height: 100vh;
  overflow: hidden;
}
.gens-sticky { width: 100%; height: 100%; }
.gens-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: stretch;
  width: 100%; height: 100%;
  padding: 60px 56px 60px;
}

.gens-scene {
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.scene-frame {
  position: relative;
  width: min(100%, calc(100vh - 140px));
  aspect-ratio: 1 / 1;
  border-radius: 28px;
  background:
    radial-gradient(80% 60% at 50% 30%, rgba(255,255,255,0.04), transparent 70%),
    linear-gradient(180deg, rgba(255,255,255,0.025), rgba(0,0,0,0.18));
  border: 1px solid var(--hairline);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.04);
}
.scene-frame::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(72% 60% at 50% 50%, black, transparent 88%);
  pointer-events: none;
}
.scene-chrome {
  position: absolute; left: 18px; right: 18px; top: 18px; bottom: 18px;
  display: flex; flex-direction: column; justify-content: space-between;
  pointer-events: none;
}
.scene-tag { display: flex; align-items: center; gap: 10px; }
.tag-pill {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 600;
  padding: 6px 10px; border-radius: 6px;
  background: rgba(0,0,0,0.5); border: 1px solid var(--hairline);
  color: var(--text);
}
.tag-pill.phase-2G { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 40%, transparent); }
.tag-pill.phase-3G { color: var(--accent-3); border-color: color-mix(in oklab, var(--accent-3) 40%, transparent); }
.tag-pill.phase-4G { color: var(--accent-2); border-color: color-mix(in oklab, var(--accent-2) 40%, transparent); }
.tag-progress {
  font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-dim);
}
.scene-caption {
  align-self: flex-start;
  font-size: 13px; color: var(--text-soft);
  background: rgba(0,0,0,0.5); border: 1px solid var(--hairline);
  padding: 8px 14px; border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  max-width: 90%;
  transition: opacity .3s;
}

/* ---------- Legends (overlay on scene) ---------- */
.legend {
  position: absolute;
  background: rgba(8, 7, 24, 0.65);
  backdrop-filter: blur(6px);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 11.5px;
  color: var(--text-soft);
  font-family: 'JetBrains Mono', monospace;
  pointer-events: none;
  z-index: 2;
  transition: opacity 0.3s;
}
.legend .legend-title {
  font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px; font-weight: 600;
}
.legend.top-right { top: 18px; right: 18px; min-width: 110px; }
.legend.bottom-right { bottom: 18px; right: 18px; max-width: 380px; }

/* atoms (top-right initial state) */
.legend-atoms { transition: opacity 0.35s; }
.legend-atoms .legend-row {
  display: flex; align-items: center; gap: 8px;
  padding: 0;
  line-height: 1.4;
  color: var(--text);
}
.legend-atoms .dot,
.legend-bar  .dot {
  width: 11px; height: 11px; border-radius: 50%;
  box-shadow: inset 0 -2px 3px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.08);
}

/* color bar (top-right after charges) */
.legend-bar {
  position: absolute; top: 10px; left: 12px; right: 12px;
  transition: opacity 0.35s;
}
.legend-bar .bar-wrap {
  display: grid; grid-template-columns: auto 1fr auto; gap: 6px; align-items: center;
  margin-top: 2px;
}
.legend-bar .bar-grad {
  height: 10px; border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
}
.legend-bar .bar-tick { font-size: 10.5px; color: var(--text); font-weight: 600; }
.legend-bar .bar-mid { font-size: 9.5px; color: var(--text-dim); text-align: center; margin-top: 2px; }

/* active concepts list (bottom-right) — 2 column grid so it covers less of the scene */
.active-list {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px 14px;
}
.active-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 0;
  transition: opacity 0.35s, color 0.35s;
  font-size: 11px;
  line-height: 1.4;
}
.active-list li.on { color: var(--text); }
.active-list .dot {
  width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.08);
}

/* progress rail next to the scene */
.rail {
  position: absolute; left: -36px; top: 8%; bottom: 8%;
  width: 28px;
}
.rail-track {
  position: absolute; left: 13px; top: 0; bottom: 0; width: 2px;
  background: var(--hairline);
}
.rail-fill {
  position: absolute; top: 0; left: 0; width: 100%;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}
.rail-stop {
  position: absolute; left: 0; transform: translateY(-50%);
  display: flex; align-items: center; gap: 10px;
  font-size: 10px; font-family: 'JetBrains Mono', monospace;
  color: var(--text-dim); letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color .2s;
}
.rail-stop .rail-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--bg-deep); border: 1.5px solid var(--hairline-strong);
  margin-left: 8px;
  transition: all .25s;
}
.rail-stop.hit { color: var(--text); }
.rail-stop.hit .rail-dot {
  background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 25%, transparent);
}

/* ---------- Gen cards (collapsible — active expands) ---------- */
.gens-text {
  display: flex; flex-direction: column; justify-content: center;
  gap: 14px;
}
.gen-card {
  padding: 18px 22px 18px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--hairline);
  transition: all 0.5s cubic-bezier(.4,0,.2,1);
  opacity: 0.4;
  filter: saturate(0.5);
}
.gen-card.active {
  background: var(--card-strong);
  border-color: var(--hairline-strong);
  opacity: 1; filter: none;
  box-shadow: 0 18px 50px rgba(0,0,0,0.32);
}
.gen-card header {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 0;
  transition: margin-bottom .4s;
}
.gen-card.active header { margin-bottom: 14px; }
.gen-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 17px; font-weight: 700;
  padding: 7px 11px;
  border-radius: 10px;
  background: color-mix(in oklab, var(--accent) 14%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in oklab, var(--accent) 30%, transparent);
}
.gen-card.active:nth-of-type(2) .gen-num {
  background: color-mix(in oklab, var(--accent-3) 14%, transparent);
  color: var(--accent-3);
  border-color: color-mix(in oklab, var(--accent-3) 30%, transparent);
}
.gen-card.active:nth-of-type(3) .gen-num {
  background: color-mix(in oklab, var(--accent-2) 14%, transparent);
  color: var(--accent-2);
  border-color: color-mix(in oklab, var(--accent-2) 30%, transparent);
}
.gen-card h3 { margin: 0; font-size: 21px; font-weight: 700; letter-spacing: -0.01em; }
.gen-sub { margin: 2px 0 0; font-size: 13px; color: var(--text-soft); }

.gen-body {
  max-height: 0; opacity: 0; overflow: hidden;
  transition: max-height 0.55s cubic-bezier(.4,0,.2,1), opacity 0.4s;
}
.gen-card.active .gen-body { max-height: 320px; opacity: 1; }

.gen-card ul { list-style: none; padding: 0; margin: 0 0 14px; }
.gen-card li {
  position: relative;
  padding: 4px 0 4px 18px;
  font-size: 14px; color: var(--text-soft);
  text-wrap: pretty;
}
.gen-card li::before {
  content: ''; position: absolute; left: 0; top: 12px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.gen-card:nth-of-type(2) li::before { background: var(--accent-3); }
.gen-card:nth-of-type(3) li::before { background: var(--accent-2); }

.gen-eq {
  padding: 12px 16px;
  background: var(--code-bg);
  border-radius: 10px;
  color: var(--text);
  border: 1px solid var(--hairline);
  text-align: center;
  overflow-x: auto;
}
.gen-eq .katex { font-size: 1.05em; color: var(--text); }
.gen-eq .katex .mathdefault, .gen-eq .katex .mord { color: var(--text); }

/* ---------- Sections ---------- */
.section-head {
  max-width: 720px; margin: 0 auto 56px; text-align: center; padding: 0 24px;
}
.kicker {
  display: inline-block; margin-bottom: 14px;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
}
.section-head h2 {
  margin: 0 0 14px;
  font-size: clamp(32px, 4vw, 52px); line-height: 1.05; letter-spacing: -0.02em;
  font-weight: 700;
  text-wrap: balance;
}
.section-head p {
  margin: 0; color: var(--text-soft); font-size: 17px;
  text-wrap: pretty;
}

.features { padding: 140px 40px 80px; }
.feature-grid {
  max-width: 1240px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature {
  padding: 28px;
  border-radius: 22px;
  background: var(--card);
  border: 1px solid var(--hairline);
  transition: transform .25s, border-color .25s, background .25s;
  position: relative;
  overflow: hidden;
}
.feature::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(50% 40% at 50% 0%, var(--accent), transparent 70%);
  opacity: 0.08; pointer-events: none;
}
.feature.lmp::before { background: radial-gradient(50% 40% at 50% 0%, var(--accent-3), transparent 70%); }
.feature.py::before  { background: radial-gradient(50% 40% at 50% 0%, var(--accent-2), transparent 70%); }
.feature:hover { transform: translateY(-4px); border-color: var(--hairline-strong); background: var(--card-strong); }
.feature-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: grid; place-items: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--hairline);
  margin-bottom: 18px;
  color: var(--accent);
}
.feature.lmp .feature-icon { color: var(--accent-3); }
.feature.py  .feature-icon { color: var(--accent-2); }
.feature h3 { margin: 0 0 10px; font-size: 22px; letter-spacing: -0.01em; }
.feature p { margin: 0 0 18px; color: var(--text-soft); font-size: 14px; }
.feature pre {
  background: var(--code-bg);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 12.5px; line-height: 1.55;
  margin: 0 0 18px; overflow-x: auto;
  color: #ece8ff;
}
.feature pre code { white-space: pre; }
.feature-cta {
  font-size: 13px; font-weight: 600; color: var(--accent); text-decoration: none;
}
.feature.lmp .feature-cta { color: var(--accent-3); }
.feature.py  .feature-cta { color: var(--accent-2); }

/* ---------- Cite ---------- */
.cite { padding: 80px 40px 100px; }
.cite-list {
  list-style: none; padding: 0; margin: 0 auto; max-width: 820px;
  display: flex; flex-direction: column; gap: 18px;
}
.cite-list li {
  display: grid; grid-template-columns: 64px 1fr; gap: 20px; align-items: start;
  padding: 22px 26px; border-radius: 16px;
  background: var(--card); border: 1px solid var(--hairline);
}
.cite-gen {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px; font-weight: 700; color: var(--accent);
  padding: 8px 0; text-align: center;
  border-radius: 10px;
  background: color-mix(in oklab, var(--accent) 12%, transparent);
}
.cite-list li:nth-child(2) .cite-gen {
  color: var(--accent-3); background: color-mix(in oklab, var(--accent-3) 12%, transparent);
}
.cite-list li:nth-child(3) .cite-gen {
  color: var(--accent-2); background: color-mix(in oklab, var(--accent-2) 12%, transparent);
}
.cite-list p { margin: 0; color: var(--text-soft); font-size: 15px; line-height: 1.55; }
.cite-list p em { color: var(--text); font-style: italic; }
.cite-doi {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 10px;
  white-space: nowrap;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px; font-weight: 600; letter-spacing: 0.04em;
  padding: 5px 10px 5px 8px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 28%, transparent);
  transition: transform .2s, background .2s, color .2s;
}
.cite-list li:nth-child(2) .cite-doi {
  color: var(--accent-3);
  background: color-mix(in oklab, var(--accent-3) 12%, transparent);
  border-color: color-mix(in oklab, var(--accent-3) 28%, transparent);
}
.cite-list li:nth-child(3) .cite-doi {
  color: var(--accent-2);
  background: color-mix(in oklab, var(--accent-2) 12%, transparent);
  border-color: color-mix(in oklab, var(--accent-2) 28%, transparent);
}
.cite-doi:hover { transform: translateY(-1px); }
.cite-doi-tag {
  font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 2px 6px; border-radius: 4px;
  background: rgba(255,255,255,0.08);
  color: var(--text);
}

/* ---------- Footer ---------- */
.footer {
  padding: 60px 40px 30px;
  border-top: 1px solid var(--hairline);
  background: rgba(0,0,0,0.2);
}
.footer-grid {
  max-width: 1240px; margin: 0 auto;
  display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 48px;
}
.footer h4 {
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em;
  margin: 0 0 14px; color: var(--text-dim);
}
.footer a {
  display: block; color: var(--text-soft); text-decoration: none;
  font-size: 14px; padding: 4px 0;
}
.footer a:hover { color: var(--text); }
.footer-tag { color: var(--text-soft); font-size: 14px; max-width: 280px; margin: 10px 0 0; }
.footer-base {
  max-width: 1240px; margin: 40px auto 0;
  display: flex; justify-content: space-between;
  padding-top: 24px; border-top: 1px solid var(--hairline);
  color: var(--text-dim); font-size: 12px; font-family: 'JetBrains Mono', monospace;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .gens-grid { grid-template-columns: 1fr; padding: 60px 24px; }
  .gens-text { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }

  /* keep the progress rail inside the visible area; labels stay visible but smaller */
  .rail { left: 6px; width: auto; right: auto; }
  .rail-track { left: 6px; }
  .rail-stop .rail-dot { margin-left: 2px; }
  .rail-label {
    font-size: 9.5px;
    color: var(--text-dim);
    text-shadow: 0 0 6px rgba(0,0,0,0.6);
  }
}

@media (max-width: 720px) {
  /* --- nav --- */
  .nav { padding: 12px 18px; }
  .logo-img { height: 32px; }
  .nav-pill { padding: 7px 12px; font-size: 12px; }
  .nav-pill.ghost { display: none; }

  /* --- hero text reflow --- */
  .hero { padding: 56px 20px 90px; }
  .hero h1 {
    font-size: clamp(30px, 9vw, 44px);
    line-height: 1.08;
    margin: 16px 0 14px;
    overflow-wrap: break-word;
    word-break: normal;
    hyphens: auto;
    text-wrap: balance;
  }
  /* the hard <br/> in the hero h1 forces a bad break on phones — neutralise it */
  .hero h1 br { display: none; }
  .lead { font-size: 15px; }
  .hero-meta { gap: 28px; margin-top: 40px; grid-template-columns: repeat(3, 1fr); }
  .meta-num { font-size: 22px; }
  .meta-lbl { font-size: 10px; }
  .hero-scroll-hint { display: none; }

  /* --- scene-frame: pin to top, let the bottom-right legend sit below the box --- */
  .gens-grid {
    /* leave space for the sticky nav (~58px) */
    padding: 80px 16px 24px;
    align-items: stretch;
  }
  .gens-scene {
    /* stack the scene + mobile legend vertically and center the pair */
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
  }
  /* on phones, the rail labels would overlap the scene; drop them. */
  .rail-label { display: none; }
  .scene-frame {
    width: 100%;
    max-width: min(100%, calc(100vh - 320px));
    margin: 0 auto;
    overflow: visible;
  }
  /* clip the inner grid background but allow the legend to overflow */
  .scene-frame::before {
    border-radius: 28px;
    overflow: hidden;
  }
  /* hide the desktop in-frame bottom-right legend on mobile */
  .scene-frame > .legend.bottom-right.desktop-only { display: none; }
  /* mobile-only legend rendered after the scene-frame */
  .legend.bottom-right.mobile-only {
    position: relative;
    inset: auto;
    margin: 0 auto;
    width: 100%;
    max-width: min(100%, calc(100vh - 320px));
  }
  .active-list { grid-template-columns: 1fr 1fr; gap: 4px 12px; font-size: 11px; }

  /* --- features --- */
  .features { padding: 80px 20px 40px; }
  .feature { padding: 22px; }

  /* --- cite --- */
  .cite { padding: 60px 20px 80px; }
  .cite-list li { padding: 18px 18px; grid-template-columns: 52px 1fr; gap: 14px; }
  .cite-gen { font-size: 15px; }
  .cite-list p { font-size: 14px; overflow-wrap: anywhere; word-break: break-word; }
  /* DOI pills: the identifier is long, so let it wrap onto two lines instead
     of bleeding out of the card. */
  .cite-doi {
    white-space: normal;
    overflow-wrap: anywhere;
    word-break: break-all;
    font-size: 10.5px;
    padding: 5px 10px 5px 8px;
    line-height: 1.5;
    max-width: 100%;
  }
  .cite-doi-tag { flex-shrink: 0; }

  /* --- footer --- */
  .footer { padding: 48px 20px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-base { flex-direction: column; gap: 6px; align-items: flex-start; }
}

/* hide mobile-only legend at desktop sizes */
@media (min-width: 721px) {
  .legend.bottom-right.mobile-only { display: none; }
}

/* very narrow screens: drop the top-right Atoms / charge-bar legend entirely
   so the scene has room to breathe. */
@media (max-width: 520px) {
  .legend.top-right { display: none; }
}