:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-soft: #f4f7fb;
  --ink: #172033;
  --muted: #5d6878;
  --line: #d9e0ea;
  --accent: #1d4f7a;
  --accent-dark: #133755;
  --accent-soft: #e7f0f8;
  --shadow: 0 16px 40px rgba(23, 32, 51, 0.08);
  --radius: 18px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(231, 240, 248, 0.72) 0, rgba(248, 249, 251, 0) 360px),
    var(--bg);
  color: var(--ink);
  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);
  text-decoration: none;
}

a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(248, 249, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.nav,
main,
.site-footer {
  width: min(1080px, calc(100% - 48px));
  margin: 0 auto;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0;
}

.brand {
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 0.94rem;
}

.nav-links a {
  color: var(--muted);
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  align-items: start;
  gap: clamp(28px, 5vw, 64px);
  padding: 78px 0 52px;
}

.hero-content {
  animation: fadeUp 0.7s ease both;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  line-height: 1.15;
}

h1,
h2 {
  font-family: Georgia, "Times New Roman", serif;
}

h1 {
  max-width: 780px;
  font-size: clamp(2.8rem, 7vw, 5.1rem);
  font-weight: 700;
  letter-spacing: -0.045em;
}

h2 {
  font-size: clamp(1.85rem, 3.6vw, 2.7rem);
  font-weight: 700;
  letter-spacing: -0.028em;
}

h3 {
  font-size: 1.06rem;
  letter-spacing: -0.01em;
}

.lead {
  max-width: 760px;
  margin: 26px 0 0;
  color: #394656;
  font-size: clamp(1.08rem, 1.8vw, 1.28rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button,
.toggle-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.button {
  padding: 0 18px;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--surface);
}

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

.button:hover,
.toggle-button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.profile-card {
  position: relative;
  padding: 28px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: fadeUp 0.8s ease 90ms both;
}

.profile-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: var(--accent);
}

.profile-card h2 {
  margin-bottom: 22px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 1.14rem;
}

dl,
dd {
  margin: 0;
}

.profile-card dl {
  display: grid;
  gap: 20px;
}

.profile-card dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.profile-card dd {
  color: var(--ink);
  font-weight: 620;
}

.section {
  padding: 48px 0;
  border-top: 1px solid var(--line);
  animation: fadeUp 0.7s ease both;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.section-heading.with-action {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  margin: 14px 0 0;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 34px;
  color: #394656;
  font-size: 1.02rem;
}

.two-column p {
  margin: 0;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.research-grid article,
.clean-list li,
.timeline article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 26px rgba(23, 32, 51, 0.045);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.research-grid article:hover,
.clean-list li:hover,
.timeline article:hover,
.publication-list li:hover {
  transform: translateY(-2px);
  border-color: rgba(29, 79, 122, 0.28);
  box-shadow: var(--shadow);
}

.research-grid article {
  padding: 22px;
}

.research-grid p {
  margin: 12px 0 0;
  color: var(--muted);
}

.current-work {
  margin-top: 18px;
  padding: 22px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-soft) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.current-work h3 {
  margin-bottom: 12px;
}

.current-work ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 1.2rem;
  color: #394656;
}

.publication-toggle {
  display: inline-flex;
  padding: 4px;
  background: var(--accent-soft);
  border: 1px solid #c9ddeb;
  border-radius: 999px;
}

.toggle-button {
  min-height: 38px;
  padding: 0 16px;
  border: 0;
  color: var(--accent-dark);
  background: transparent;
}

.toggle-button.active {
  background: var(--surface);
  color: var(--accent-dark);
  box-shadow: 0 5px 16px rgba(23, 32, 51, 0.12);
}

.publication-panel {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 220ms ease, transform 220ms ease;
}

.publication-panel.active {
  opacity: 1;
  transform: translateY(0);
}

.publication-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.publication-list li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.paper-year {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.03em;
}

.paper-title,
.paper-authors,
.paper-venue {
  display: block;
}

.paper-title {
  color: var(--ink);
  font-weight: 800;
  line-height: 1.38;
}

.paper-authors {
  margin-top: 7px;
  color: #3f4c5c;
}

.paper-venue {
  margin-top: 5px;
  color: var(--accent);
  font-weight: 750;
}

.note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.split-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 42px;
}

.clean-list {
  display: grid;
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.clean-list li {
  padding: 16px 18px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.timeline article {
  padding: 22px;
}

.timeline span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 800;
}

.timeline p {
  margin: 10px 0 0;
  color: var(--muted);
}

.site-footer {
  padding: 28px 0 42px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 0.92rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 900px) {
  .hero,
  .two-column,
  .research-grid,
  .split-section,
  .timeline {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 48px 0 36px;
  }

  .section-heading.with-action {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .nav,
  main,
  .site-footer {
    width: min(100% - 28px, 1080px);
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav-links {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  h1 {
    font-size: clamp(2.35rem, 15vw, 3.4rem);
  }

  .profile-card,
  .research-grid article,
  .publication-list li,
  .clean-list li,
  .timeline article {
    border-radius: 14px;
  }

  .publication-toggle {
    width: 100%;
  }

  .toggle-button {
    flex: 1;
  }

  .publication-list li {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px;
  }

  .paper-year {
    font-size: 0.9rem;
  }

  .hero-actions,
  .site-footer {
    flex-direction: column;
  }
}