:root {
  --bg: #f3eee4;
  --bg-deep: #e8e0d0;
  --ink: #1a1612;
  --ink-soft: #5a5248;
  --card: #fffcf7;
  --cardinal: #8c1515;
  --cardinal-deep: #5c0c0c;
  --line: rgba(140, 21, 21, 0.35);
  --shadow: 0 18px 40px rgba(40, 24, 12, 0.1);
  --radius: 18px;
  --serif: "Cormorant Garamond", "Palatino Linotype", Palatino, serif;
  --sans: "Source Sans 3", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(140, 21, 21, 0.12), transparent 55%),
    radial-gradient(900px 500px at 10% 20%, rgba(90, 70, 40, 0.08), transparent 50%),
    linear-gradient(180deg, #f7f2e8 0%, var(--bg) 40%, #ebe4d6 100%);
  min-height: 100vh;
  line-height: 1.5;
}

a {
  color: var(--cardinal);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--cardinal-deep);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.5rem, 6vw, 4.5rem) 1.25rem 2.5rem;
  text-align: center;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 42rem;
  margin: 0 auto;
}

.hero-glow {
  position: absolute;
  inset: auto 50% -40% auto;
  width: 70vmin;
  height: 70vmin;
  transform: translateX(50%);
  background: radial-gradient(circle, rgba(140, 21, 21, 0.18), transparent 65%);
  pointer-events: none;
  filter: blur(10px);
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.eyebrow a {
  color: var(--ink-soft);
  text-decoration: none;
}

.eyebrow a:hover {
  color: var(--cardinal);
}

.hero h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.8rem, 8vw, 4.6rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--cardinal-deep);
}

.lede {
  margin: 1rem auto 0;
  max-width: 34rem;
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2.6vw, 1.45rem);
  font-style: italic;
  color: var(--ink-soft);
}

.hero-meta {
  margin: 1.25rem 0 0;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.tree-wrap {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
  padding: 0.5rem 1.1rem 4rem;
}

.gen-dual .dual-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}

.dual-col {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.path-label {
  margin: 0;
  text-align: center;
  font-family: var(--serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--cardinal-deep);
}

.gen-dual .node {
  grid-template-columns: 72px 1fr;
  gap: 0.75rem;
  padding: 0.85rem 0.9rem;
}

.gen-dual .portrait {
  width: 72px;
  height: 72px;
}

.gen-dual .node-body h2 {
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
}

.split-lines {
  position: relative;
  height: 36px;
  margin: 0.35rem auto -0.2rem;
  max-width: 70%;
}

.split-lines::before,
.split-lines::after {
  content: "";
  position: absolute;
  bottom: 0;
  width: 50%;
  height: 100%;
  border-color: var(--line);
  border-style: solid;
}

.split-lines::before {
  left: 0;
  border-width: 2px 2px 0 0;
  border-radius: 0 18px 0 0;
}

.split-lines::after {
  right: 0;
  border-width: 2px 0 0 2px;
  border-radius: 18px 0 0 0;
}

.node.root {
  max-width: 560px;
  margin-inline: auto;
}

.era-bridge {
  position: relative;
  z-index: 1;
  text-align: center;
  margin: 1.25rem 0 0.25rem;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 1.05rem;
  font-style: italic;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.era-bridge span {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: rgba(255, 250, 245, 0.85);
  border-radius: 999px;
  border: 1px dashed var(--line);
}

.full-lineage {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin: 1.25rem auto 0.5rem;
  padding: 0.85rem 1.15rem 1rem;
  background: rgba(255, 252, 248, 0.92);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 8px 28px rgba(40, 20, 10, 0.06);
}

.full-lineage summary {
  cursor: pointer;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--cardinal-deep);
  list-style: none;
}

.full-lineage summary::-webkit-details-marker {
  display: none;
}

.full-lineage summary::after {
  content: " ▾";
  font-size: 0.85em;
  color: var(--ink-soft);
}

.full-lineage:not([open]) summary::after {
  content: " ▸";
}

.lineage-ol {
  margin: 0.85rem 0 0.5rem;
  padding-left: 1.25rem;
  color: var(--ink);
  font-size: 0.92rem;
  line-height: 1.55;
}

.lineage-ol li {
  margin: 0.2rem 0;
}

.lineage-ol .yr {
  color: var(--ink-soft);
  font-size: 0.88em;
}

.lineage-ol em {
  color: var(--ink-soft);
  font-size: 0.88em;
  font-style: italic;
}

.lineage-note {
  margin: 0.65rem 0 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.45;
}

.tree-rail {
  position: absolute;
  top: 0;
  bottom: 3rem;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(
    180deg,
    transparent,
    var(--line) 4%,
    var(--line) 92%,
    transparent
  );
  z-index: 0;
}

.gen {
  position: relative;
  z-index: 1;
  margin: 0 0 1.75rem;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.gen.in-view {
  opacity: 1;
  transform: none;
}

.gen-label {
  text-align: center;
  margin: 0 0 1rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.gen-fork .fork {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: stretch;
}

.merge-lines {
  position: relative;
  height: 36px;
  margin: 0.35rem auto -0.4rem;
  max-width: 70%;
}

.merge-lines::before,
.merge-lines::after {
  content: "";
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  border-color: var(--line);
  border-style: solid;
}

.merge-lines::before {
  left: 0;
  border-width: 0 2px 2px 0;
  border-radius: 0 0 18px 0;
}

.merge-lines::after {
  right: 0;
  border-width: 0 0 2px 2px;
  border-radius: 0 0 0 18px;
}

.node {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1rem 1.15rem 1.1rem;
  background: var(--card);
  border: 1px solid rgba(90, 70, 40, 0.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.node:hover,
.node:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 22px 48px rgba(40, 24, 12, 0.14);
  border-color: rgba(140, 21, 21, 0.28);
  outline: none;
}

.node.famous {
  background:
    linear-gradient(135deg, rgba(140, 21, 21, 0.05), transparent 42%),
    var(--card);
}

.node.highlight {
  border-color: rgba(140, 21, 21, 0.4);
  box-shadow: 0 20px 50px rgba(140, 21, 21, 0.14);
}

.node.self {
  background:
    linear-gradient(160deg, rgba(140, 21, 21, 0.12), transparent 50%),
    #fff;
  border: 1.5px solid rgba(140, 21, 21, 0.45);
  grid-template-columns: 108px 1fr;
}

.portrait {
  width: 92px;
  height: 92px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-deep);
  box-shadow: inset 0 0 0 3px #fff, 0 0 0 1px rgba(140, 21, 21, 0.25);
}

.node.self .portrait {
  width: 108px;
  height: 108px;
  box-shadow: inset 0 0 0 3px #fff, 0 0 0 2px var(--cardinal);
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.portrait-initials {
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #5c0c0c, #8c1515);
  color: #f7f2e8;
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.node-body h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--ink);
}

.node-body .years,
.node-body .role,
.node-body .place {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.node-body .nobel {
  color: var(--cardinal);
  font-weight: 600;
}

.node-body .role {
  color: var(--cardinal-deep);
  font-weight: 500;
}

.node-body .blurb,
.node-body .links {
  display: none;
  margin: 0.65rem 0 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.node.open .blurb,
.node.open .links,
.node:focus-within .blurb,
.node:focus-within .links {
  display: block;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

.gen-fork .node {
  grid-template-columns: 1fr;
  text-align: center;
  justify-items: center;
}

.gen-fork .portrait {
  width: 84px;
  height: 84px;
}

.chain-strip {
  position: sticky;
  bottom: 0;
  z-index: 5;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(243, 238, 228, 0.88);
  border-top: 1px solid rgba(90, 70, 40, 0.15);
  padding: 0.55rem 0.75rem;
}

.chain-strip ol {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 960px;
  margin-inline: auto;
  font-family: var(--serif);
  font-size: clamp(0.78rem, 1.8vw, 0.95rem);
  color: var(--ink-soft);
}

.chain-strip li:not(:last-child)::after {
  content: "→";
  margin-left: 0.35rem;
  margin-right: 0.15rem;
  color: rgba(140, 21, 21, 0.55);
  font-style: normal;
}

.chain-strip .you {
  color: var(--cardinal);
  font-weight: 700;
}

.page-foot {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 5.5rem;
  text-align: center;
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.page-foot p {
  margin: 0 0 0.75rem;
}

@media (max-width: 640px) {
  .tree-rail {
    left: 1.35rem;
    transform: none;
  }

  .node {
    grid-template-columns: 72px 1fr;
    gap: 0.75rem;
    padding: 0.85rem 0.9rem;
  }

  .portrait,
  .node.self .portrait {
    width: 72px;
    height: 72px;
  }

  .gen-fork .fork,
  .gen-dual .dual-cols {
    grid-template-columns: 1fr;
  }

  .merge-lines,
  .split-lines {
    display: none;
  }

  .chain-strip {
    display: none;
  }

  .page-foot {
    padding-bottom: 2rem;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}