:root {
  --bg: #e8e5e1;
  --surface: #f6f3ef;
  --surface-strong: #fcfbf9;
  --text: #201b16;
  --muted: #62574d;
  --line: #c9beb2;
  --accent: #0d5c63;
  --accent-strong: #07454a;
  --highlight: #d6b276;
  --radius: 20px;
  --shadow: 0 16px 40px rgba(37, 30, 23, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Source Serif 4", Georgia, serif;
  color: var(--text);
  background: radial-gradient(circle at 8% 4%, #f2ece4 0, #e8e5e1 42%) fixed;
  line-height: 1.45;
}

.background-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 90% 12%, rgba(214, 178, 118, 0.25), transparent 35%),
    radial-gradient(circle at 2% 95%, rgba(13, 92, 99, 0.16), transparent 40%);
  z-index: -1;
}

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

.site-header,
main,
.site-footer {
  width: min(1100px, calc(100vw - 2.5rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  justify-content: space-between;
  padding: 1.2rem 0;
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  z-index: 10;
}

.brand,
.site-nav,
.menu-toggle,
.btn,
.paper-meta,
.eyebrow {
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.site-nav {
  display: flex;
  gap: 0.2rem;
  background: color-mix(in oklab, var(--surface-strong), transparent 8%);
  border: 1px solid color-mix(in oklab, var(--line), white 20%);
  border-radius: 999px;
  padding: 0.3rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  font-size: 0.94rem;
  transition: all 180ms ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--surface-strong);
  background: var(--accent);
}

.menu-toggle {
  display: none;
}

.hero {
  padding: 3.2rem 0 1.8rem;
  animation: rise 600ms ease-out;
}

.hero.slim {
  padding-bottom: 0.7rem;
}

#publications {
  scroll-margin-top: 86px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-size: 0.8rem;
  margin: 0;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin: 0.35rem 0 0.8rem;
}

h2 {
  font-size: clamp(1.25rem, 2.3vw, 1.8rem);
  margin-top: 0;
}

h3 {
  font-size: 1.15rem;
  margin: 0 0 0.45rem;
}

.lead {
  width: min(70ch, 100%);
  font-size: 1.1rem;
  color: #352f29;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
  font-weight: 600;
  transition: transform 160ms ease, background 160ms ease;
}

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

.btn-primary {
  color: var(--surface-strong);
  background: linear-gradient(145deg, var(--accent), var(--accent-strong));
}

.btn-ghost {
  color: var(--accent-strong);
  background: color-mix(in oklab, var(--surface-strong), var(--highlight) 16%);
  border: 1px solid color-mix(in oklab, var(--line), white 20%);
}

.panel {
  background: color-mix(in oklab, var(--surface), white 35%);
  border: 1px solid color-mix(in oklab, var(--line), white 18%);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1.2rem, 2.2vw, 1.8rem);
  margin: 1rem 0;
  animation: rise 700ms ease-out;
}

.grid-2 {
  display: grid;
  gap: 1.3rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.key-points {
  padding-left: 1.1rem;
  margin: 0;
}

.key-points li {
  margin-bottom: 0.4rem;
}

.paper-list {
  display: grid;
  gap: 0.9rem;
  margin: 1rem 0 2.3rem;
}

.paper-list.compact {
  margin-bottom: 0;
}

.paper-card {
  background: color-mix(in oklab, var(--surface-strong), transparent 12%);
  border: 1px solid color-mix(in oklab, var(--line), white 12%);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.paper-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(24, 17, 12, 0.08);
}

.paper-meta {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.4rem;
}

.paper-card h2,
.paper-card h3 {
  margin-bottom: 0.45rem;
}

.paper-card p {
  margin: 0.35rem 0;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.paper-links a {
  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
  font-size: 0.9rem;
  text-decoration-thickness: 2px;
}

.bibtex-panel,
.abstract-panel {
  display: none;
  margin-top: 0.6rem;
  border: 1px solid color-mix(in oklab, var(--line), white 8%);
  background: color-mix(in oklab, var(--surface-strong), black 2%);
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
}

.bibtex-panel.open,
.abstract-panel.open {
  display: block;
}

.bibtex-code {
  margin: 0;
  white-space: pre-wrap;
  font-size: 0.82rem;
  line-height: 1.35;
  font-family: "Courier New", Courier, monospace;
}

.abstract-text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.5;
  color: #2a241f;
}

.paper-note {
  color: var(--muted);
  font-style: italic;
}

.variant-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 0.5rem;
}

.ab-panel p {
  margin: 0.5rem 0;
}

.ab-router {
  margin-top: 4rem;
  text-align: center;
}

.timeline {
  display: grid;
  gap: 1.1rem;
  margin-bottom: 2rem;
}

.timeline-year {
  background: color-mix(in oklab, var(--surface-strong), transparent 8%);
  border: 1px solid color-mix(in oklab, var(--line), white 12%);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.timeline-year h2 {
  margin: 0 0 0.65rem;
}

.timeline-list {
  display: grid;
  gap: 0.7rem;
}

.timeline-item {
  position: relative;
  border-left: 4px solid color-mix(in oklab, var(--accent), white 25%);
  padding: 0.1rem 0.9rem 0.6rem 140px;
  min-height: 96px;
  background: color-mix(in oklab, var(--surface-strong), transparent 18%);
  border-radius: 10px;
}

.paper-thumb {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  width: 112px;
  height: 84px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid color-mix(in oklab, var(--line), white 16%);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.timeline-item h3 {
  margin: 0.1rem 0 0.35rem;
}

.timeline-item p {
  margin: 0.3rem 0;
}

.variant-b {
  --accent: #7a2e1f;
  --accent-strong: #5a2016;
  --highlight: #e1c17d;
  --line: #d8c7be;
  background: radial-gradient(circle at 4% 6%, #fff3e9 0, #f6efea 42%) fixed;
}

.legal p {
  margin: 0.55rem 0;
}

.site-footer {
  padding: 1.4rem 0 2rem;
  color: var(--muted);
  border-top: 1px solid color-mix(in oklab, var(--line), white 20%);
  margin-top: 1.4rem;
}

.site-footer p {
  margin: 0.3rem 0;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 820px) {
  .site-header {
    position: relative;
    align-items: flex-start;
    flex-wrap: wrap;
    padding-bottom: 0.5rem;
  }

  .menu-toggle {
    display: inline-flex;
    border: 1px solid var(--line);
    background: var(--surface-strong);
    color: var(--text);
    border-radius: 10px;
    padding: 0.4rem 0.65rem;
    cursor: pointer;
  }

  .site-nav {
    width: 100%;
    display: none;
    flex-direction: column;
    border-radius: 14px;
  }

  .site-nav.open {
    display: flex;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .lead {
    font-size: 1.03rem;
  }

  .timeline-item {
    padding-left: 0.9rem;
    min-height: 0;
  }

  .paper-thumb {
    position: static;
    transform: none;
    width: min(156px, 100%);
    height: auto;
    aspect-ratio: 4 / 3;
    margin-bottom: 0.35rem;
  }
}