:root {
  --bg: #f5f7fb;
  --bg-elev: #ffffff;
  --ink: #111827;
  --muted: #4b5563;
  --faint: #6b7280;
  --line: rgba(17, 24, 39, 0.08);
  --line-strong: rgba(17, 24, 39, 0.14);
  --accent: #1e3a8a;
  --accent-soft: #dbeafe;
  --shadow: 0 1px 2px rgba(17, 24, 39, 0.04), 0 18px 40px rgba(17, 24, 39, 0.06);
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Outfit", "Avenir Next", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 1120px;
  --blue: #1e3a8a;
  --sky: #0c4a6e;
  --teal: #134e4a;
  --violet: #4c1d95;
  --peach: #7c2d12;
  --green: #14532d;
  --rose: #881337;
  --gold: #78350f;
  --fnd: var(--blue);
  --att: var(--sky);
  --lin: var(--teal);
  --moe: var(--violet);
  --blk: var(--peach);
  --ifc: var(--green);
  --cmp: var(--rose);
  --syn: var(--gold);
}

[data-theme="dark"] {
  --bg: #0c1220;
  --bg-elev: #141b2d;
  --ink: #f8fafc;
  --muted: #cbd5e1;
  --faint: #94a3b8;
  --line: rgba(248, 250, 252, 0.1);
  --line-strong: rgba(248, 250, 252, 0.16);
  --accent: #93c5fd;
  --accent-soft: rgba(147, 197, 253, 0.12);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(880px 420px at -8% -12%, rgba(219, 234, 254, 0.95), transparent 58%),
    radial-gradient(720px 380px at 108% -8%, rgba(254, 243, 199, 0.7), transparent 52%),
    radial-gradient(640px 320px at 70% 8%, rgba(255, 228, 230, 0.45), transparent 50%),
    var(--bg);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

[data-theme="dark"] body {
  background:
    radial-gradient(880px 420px at -8% -12%, rgba(30, 58, 138, 0.35), transparent 58%),
    radial-gradient(720px 380px at 108% -8%, rgba(120, 53, 15, 0.22), transparent 52%),
    var(--bg);
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { opacity: 0.78; }

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 1rem 1.25rem;
  min-height: 3.4rem;
}

.brand {
  color: inherit;
  font-weight: 560;
  letter-spacing: -0.03em;
  text-decoration: none;
  white-space: nowrap;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1rem;
  margin-left: auto;
  font-size: 0.9rem;
}

.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a.active { color: var(--ink); }

.icon-btn {
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--ink);
  cursor: pointer;
}

.hero { padding: 3.4rem 0 0.6rem; }

.kicker {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 560;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  max-width: 22ch;
  margin: 0.7rem 0 0.95rem;
  font-family: var(--serif);
  font-size: clamp(2.1rem, 4.6vw, 3.7rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.lede {
  max-width: 40rem;
  margin: 0 0 1.35rem;
  color: var(--muted);
  font-size: 1.12rem;
  line-height: 1.55;
}

.spectrum {
  width: min(22rem, 100%);
  height: 4px;
  margin: 0 0 1.35rem;
  border-radius: 99px;
  background: linear-gradient(90deg, #93c5fd 0%, #6ee7b7 34%, #fda4af 67%, #fcd34d 100%);
}

.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.28rem 0.8rem;
  max-width: 52rem;
  margin: 0 0 0.45rem;
  font-size: 0.98rem;
}

.authors span { white-space: nowrap; }

.authors sup, .affils sup, .notes sup {
  margin-left: 0.04em;
  color: var(--accent);
  font-size: 0.68em;
}

.affils, .notes {
  max-width: 54rem;
  margin: 0.12rem 0;
  color: var(--faint);
  font-size: 0.86rem;
  line-height: 1.55;
}

.notes { margin-top: 0.4rem; color: var(--muted); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.35rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.92rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--ink);
  font-size: 0.92rem;
  text-decoration: none;
}

.btn.primary {
  background: var(--ink);
  border-color: var(--ink);
  color: #f8fafc;
}

.btn:hover { opacity: 1; transform: translateY(-1px); }

section { padding: 2.7rem 0; scroll-margin-top: 4.2rem; }
.sec-head { max-width: 44rem; margin-bottom: 1.1rem; }

.section-label {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}

h2 {
  margin: 0 0 0.5rem;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 2.4vw, 2.15rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.sec-lead { margin: 0; color: var(--muted); }

.abstract { display: grid; gap: 0.9rem; max-width: 46rem; }
.abstract p { margin: 0; }
.abstract p:first-child {
  font-family: var(--serif);
  font-size: 1.28rem;
  line-height: 1.38;
  letter-spacing: -0.02em;
}

.figure {
  margin: 0;
  overflow: hidden;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 1.15rem;
  box-shadow: var(--shadow);
}

.figure img { width: 100%; background: #fff; }
.figure.scroll { max-height: 70vh; overflow: auto; }

figcaption {
  padding: 0.85rem 1.05rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

figcaption strong { margin-right: 0.3rem; color: var(--ink); font-weight: 560; }

.grid-2, .grid-4, .grid-chapters, .grid-3 { display: grid; gap: 0.75rem; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-chapters { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.mt { margin-top: 0.9rem; }

.card, .dir, .close-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem 1.05rem 1.1rem;
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.02);
}

.dir {
  background: var(--wash, var(--bg-elev));
  border-top: 3px solid var(--chip, var(--accent));
}

.wash-blue { --chip: var(--blue); --wash: #eff6ff; }
.wash-green { --chip: var(--green); --wash: #ecfdf5; }
.wash-rose { --chip: var(--rose); --wash: #fff1f2; }
.wash-gold { --chip: var(--gold); --wash: #fffbeb; }

[data-theme="dark"] .wash-blue,
[data-theme="dark"] .wash-green,
[data-theme="dark"] .wash-rose,
[data-theme="dark"] .wash-gold { --wash: var(--bg-elev); }

.idx {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.card h3, .dir h3, .close-card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.18rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.card p, .dir p, .close-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.chapter {
  display: grid;
  grid-template-columns: 4px 1fr;
  gap: 0.85rem;
  align-items: stretch;
  padding: 0.95rem 1rem;
}

.chapter .bar {
  border-radius: 99px;
  background: var(--chip);
}

.table-wrap {
  overflow-x: auto;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }

th, td {
  padding: 0.78rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: color-mix(in srgb, var(--bg) 70%, white);
  color: var(--faint);
  font-size: 0.72rem;
  font-weight: 560;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

td.dir-cell {
  width: 11.5rem;
  background: var(--wash, var(--accent-soft));
  color: var(--ink);
  font-weight: 560;
}

tr:last-child td { border-bottom: 0; }

.cite-box {
  position: relative;
  overflow-x: auto;
  padding: 1.15rem 1.15rem 1.25rem;
  border-radius: 1rem;
  background: #111827;
  color: #f8fafc;
}

.cite-box pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  white-space: pre;
}

.copy {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  padding: 0.25rem 0.7rem;
  border: 1px solid rgba(248, 250, 252, 0.22);
  border-radius: 999px;
  background: transparent;
  color: inherit;
  font-family: var(--sans);
  cursor: pointer;
}

.links { margin: 1rem 0 0; color: var(--muted); }

footer {
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.88rem;
}

@media (max-width: 900px) {
  .nav { display: none; }
  .grid-2, .grid-4, .grid-chapters, .grid-3 { grid-template-columns: 1fr; }
  .hero { padding-top: 2.2rem; }
  h1 { max-width: none; }
  td.dir-cell { width: auto; }
}