:root {
  --bg: #f6f4ef;
  --surface: #fffdf8;
  --text: #1f2933;
  --muted: #52606d;
  --line: #d8d2c6;
  --accent: #8c4a2f;
  --accent-soft: #f4ece8;
  --maxw: 960px;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Source Serif 4", Georgia, Cambria, "Times New Roman", serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, #fff 0%, transparent 50%),
    radial-gradient(circle at 90% 0%, #f1e8dc 0%, transparent 45%),
    var(--bg);
  line-height: 1.6;
}

a {
  color: var(--accent);
}

.container {
  width: min(92%, var(--maxw));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 80%, white 20%);
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.2rem 0.1rem;
  border-bottom: 2px solid transparent;
}

.nav a[aria-current="page"] {
  color: var(--text);
  border-color: var(--accent);
}

main {
  padding: 3.2rem 0 4.5rem;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 4vw, 2.6rem);
  box-shadow: 0 8px 35px rgba(30, 41, 59, 0.06);
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 0.75rem;
  font-weight: 600;
}

h1 {
  font-size: clamp(2rem, 3.8vw, 2.9rem);
}

h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  margin-top: 2.3rem;
}

p {
  margin: 0 0 0.95rem;
  color: var(--text);
}

.muted {
  color: var(--muted);
}

.pill {
  display: inline-block;
  font-size: 0.88rem;
  letter-spacing: 0.01em;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid #e9d7cf;
  border-radius: 999px;
  padding: 0.28rem 0.68rem;
  margin-bottom: 0.9rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.2rem;
  margin-top: 1.7rem;
}

.card {
  grid-column: span 12;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
}

.card h3 {
  font-size: 1.12rem;
}

ul.clean {
  list-style: none;
  margin: 0;
  padding: 0;
}

ul.clean li {
  padding: 0.58rem 0;
  border-bottom: 1px solid var(--line);
}

ul.clean li:last-child {
  border-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.1rem 0 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (min-width: 760px) {
  .card.span-6 {
    grid-column: span 6;
  }

  .card.span-4 {
    grid-column: span 4;
  }
}

.paper-title {
  display: block;
  font-weight: 300;
  font-size: 1.1rem;
}

.paper-coauthor {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.paper-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  column-gap: 1.6rem;
  row-gap: 0.45rem;
  margin: 0.55rem 0 0;
  padding: 0;
  list-style: none;
}

ul.clean .paper-meta li {
  display: flex;
  align-items: center;
  padding: 0;
  border-bottom: 0;
}

.paper-meta em {
  color: var(--muted);
  font-size: 0.9rem;
}

.abstract-toggle {
  display: inline-block;
}

.abstract-toggle summary {
  list-style: none;
  display: inline-block;
  cursor: pointer;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.abstract-toggle summary:hover {
  color: var(--accent);
}

.abstract-toggle summary::-webkit-details-marker {
  display: none;
}

.abstract-toggle[open] summary {
  margin-bottom: 0.55rem;
  color: var(--accent);
}

.abstract-panel {
  max-width: 44rem;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fcfaf5;
}

.abstract-panel p {
  margin: 0;
  color: var(--muted);
}