:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --text: #132238;
  --muted: #5f6f89;
  --line: #dce3ee;
  --card: #ffffff;
  --accent: #1f5eff;
  --accent-dark: #143fb0;
  --accent-soft: #eaf0ff;
  --gold: #b7791f;
  --shadow: 0 18px 45px rgba(19, 34, 56, 0.09);
  --radius: 22px;
  --maxw: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

.container {
  width: min(100% - 40px, var(--maxw));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--text);
  color: #ffffff;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
  font-size: 0.95rem;
  padding: 9px 12px;
  border-radius: 999px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-dark);
  background: var(--accent-soft);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 999px;
  padding: 10px 14px;
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
}

.hero {
  padding: 92px 0 72px;
  background:
    radial-gradient(circle at top right, rgba(31, 94, 255, 0.12), transparent 34%),
    linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 36px;
  align-items: center;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.2rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}

.lead {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--muted);
  max-width: 780px;
  margin: 24px 0 0;
}

.narrow {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 800;
}

.hero-card,
.callout,
.card,
.list-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
}

.hero-card h2,
.card h2,
.card h3,
.list-item h2 {
  margin-top: 0;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.clean-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.clean-list li {
  padding-left: 28px;
  position: relative;
  color: var(--muted);
}

.clean-list li::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  position: absolute;
  left: 0;
  top: 0.65em;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
  background: #ffffff;
}

.button.primary {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.button.primary:hover {
  background: var(--accent-dark);
  color: #ffffff;
}

.button.ghost {
  background: transparent;
}

.page-hero {
  padding: 74px 0 54px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}

.section {
  padding: 66px 0;
}

.section.tinted {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 24px;
}

.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  margin-top: 0;
  letter-spacing: -0.05em;
  line-height: 1.1;
}

.two-column {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 36px;
  align-items: start;
}

.callout {
  padding: 24px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
}

.callout h3 {
  margin-top: 0;
}

.mini-links,
.item-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.mini-links a,
.item-links a,
.card a {
  font-weight: 800;
}

.card-grid {
  display: grid;
  gap: 18px;
}

.card-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  padding: 24px;
}

.card-label,
.date {
  margin: 0 0 10px;
  color: var(--gold);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
}

.list {
  display: grid;
  gap: 18px;
}

.list-item {
  padding: 24px;
}

.list-item p {
  color: var(--muted);
}

.toolbar {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
  max-width: 540px;
}

.toolbar label {
  font-weight: 800;
}

input[type="search"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  font: inherit;
  color: var(--text);
  background: #ffffff;
}

code {
  background: var(--accent-soft);
  color: var(--accent-dark);
  padding: 0.15em 0.35em;
  border-radius: 0.45em;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  background: var(--bg-soft);
  color: var(--muted);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-grid p {
  margin: 0;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    padding: 16px 0;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 74px;
    left: 20px;
    right: 20px;
    padding: 14px;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    align-items: stretch;
  }

  .nav-links.open {
    display: grid;
  }

  .nav-links a {
    padding: 12px;
  }

  .hero-grid,
  .two-column,
  .card-grid.two,
  .card-grid.three {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 64px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(2.7rem, 16vw, 4.6rem);
  }
}

/* Publications page */
.publications-hero {
  background:
    radial-gradient(circle at 10% 0%, rgba(183, 121, 31, 0.16), transparent 32%),
    radial-gradient(circle at 92% 10%, rgba(31, 94, 255, 0.14), transparent 34%),
    var(--bg-soft);
}

.pub-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 12px;
  margin-top: 30px;
  max-width: 820px;
}

.pub-stats div {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 12px 28px rgba(19, 34, 56, 0.06);
}

.pub-stats strong {
  display: block;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--accent-dark);
}

.pub-stats span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.publication-controls {
  padding-bottom: 24px;
}

.publications-toolbar {
  max-width: 720px;
}

.filter-row,
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-row {
  margin-top: 18px;
}

.filter-button {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-weight: 800;
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
}

.filter-button:hover,
.filter-button.active {
  background: var(--text);
  border-color: var(--text);
  color: #ffffff;
}

.legend {
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.marker {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.marker.journal,
.pub-tag.journal {
  --tag-bg: #eaf0ff;
  --tag-fg: #143fb0;
  --tag-border: #c7d5ff;
}

.marker.conference,
.pub-tag.conference {
  --tag-bg: #eafaf3;
  --tag-fg: #11633d;
  --tag-border: #bce8d2;
}

.marker.under-review,
.pub-tag.under-review {
  --tag-bg: #fff4df;
  --tag-fg: #8a5200;
  --tag-border: #f4d49d;
}

.marker.book,
.pub-tag.book {
  --tag-bg: #f3eefe;
  --tag-fg: #5a31a6;
  --tag-border: #d8caf6;
}

.marker.princeton,
.pub-tag.princeton {
  --tag-bg: #f7efe4;
  --tag-fg: #8b4b00;
  --tag-border: #ead3b6;
}

.marker.journal { background: #143fb0; }
.marker.conference { background: #11633d; }
.marker.under-review { background: #b7791f; }
.marker.book { background: #5a31a6; }
.marker.princeton { background: #e77500; }

.publication-years {
  padding-top: 28px;
}

.year-group {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.year-group > h2 {
  position: sticky;
  top: 96px;
  align-self: start;
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--accent-dark);
}

.publication-list {
  display: grid;
  gap: 16px;
}

.publication-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 14px 34px rgba(19, 34, 56, 0.07);
}

.publication-card h3 {
  margin: 0;
  font-size: clamp(1.12rem, 2.2vw, 1.42rem);
  line-height: 1.24;
  letter-spacing: -0.035em;
}

.publication-card p {
  margin: 9px 0 0;
}

.publication-card .authors {
  color: var(--text);
}

.publication-card .venue,
.publication-card .note {
  color: var(--muted);
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.pub-links a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  text-decoration: none;
  font-weight: 850;
  padding: 6px 11px;
}

.pub-links a:hover {
  background: var(--accent);
  color: #ffffff;
}

.pub-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.pub-tag {
  background: var(--tag-bg);
  color: var(--tag-fg);
  border: 1px solid var(--tag-border);
  border-radius: 999px;
  padding: 5px 9px;
  font-size: 0.78rem;
  font-weight: 850;
}

.empty-state {
  padding: 28px;
  border-radius: 18px;
  border: 1px dashed var(--line);
  color: var(--muted);
  text-align: center;
  background: var(--bg-soft);
}

@media (max-width: 860px) {
  .pub-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .year-group {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .year-group > h2 {
    position: static;
  }
}

@media (max-width: 520px) {
  .pub-stats {
    grid-template-columns: 1fr;
  }

  .publication-card {
    padding: 18px;
  }
}