:root {
  color-scheme: light;
  --bg: #f6f3ee;
  --bg-soft: #fffaf2;
  --text: #1f2933;
  --muted: #65717e;
  --line: #e5ddd0;
  --accent: #1d4ed8;
  --accent-dark: #173f9b;
  --card: rgba(255, 255, 255, 0.78);
  --shadow: 0 24px 70px rgba(31, 41, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(29, 78, 216, 0.12), transparent 34rem),
    linear-gradient(135deg, #f9f5ed 0%, var(--bg) 48%, #eef3ff 100%);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(229, 221, 208, 0.75);
  background: rgba(246, 243, 238, 0.82);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0;
}

.brand {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.nav-links a:hover,
.contact-links a:hover,
.language-toggle:hover {
  color: var(--accent);
}

.language-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  padding: 7px 12px;
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 88px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - 72px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: clamp(3.6rem, 10vw, 8.4rem);
  line-height: 0.9;
  letter-spacing: -0.09em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.02;
  letter-spacing: -0.06em;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.05rem;
}

.hero-subtitle {
  max-width: 740px;
  color: var(--muted);
  font-size: clamp(1.12rem, 2vw, 1.45rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border-radius: 999px;
  padding: 0 22px;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 14px 28px rgba(29, 78, 216, 0.28);
}

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

.button.secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
}

.profile-card,
.stats-section article,
.research-grid article,
.timeline article,
.publication-card,
.contact-section {
  border: 1px solid rgba(229, 221, 208, 0.9);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.profile-card {
  border-radius: 34px;
  padding: 32px;
}

.stats-section {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 0;
}

.stats-section article {
  border-radius: 26px;
  padding: 24px;
}

.stats-section strong {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-dark);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.06em;
}

.stats-section span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.avatar {
  display: grid;
  width: 96px;
  height: 96px;
  margin-bottom: 26px;
  place-items: center;
  border-radius: 28px;
  background: linear-gradient(135deg, #1d4ed8, #7c3aed);
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.06em;
}

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

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tag-list span,
.publication-tag {
  border: 1px solid rgba(29, 78, 216, 0.16);
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.08);
  color: var(--accent-dark);
  padding: 6px 10px;
  font-size: 0.78rem;
  font-weight: 800;
}

.split-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 42px;
  align-items: start;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.research-grid article {
  border-radius: 26px;
  padding: 26px;
}

.research-grid p,
.timeline p,
.publication-meta,
.publication-authors,
.contact-section p,
.footer {
  color: var(--muted);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.timeline article {
  border-radius: 26px;
  padding: 26px;
}

.timeline span {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.search-label {
  width: min(100%, 340px);
}

input[type="search"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  font: inherit;
  outline: none;
  padding: 14px 18px;
}

input[type="search"]:focus {
  border-color: rgba(29, 78, 216, 0.5);
  box-shadow: 0 0 0 4px rgba(29, 78, 216, 0.12);
}

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

.publication-card {
  display: grid;
  gap: 12px;
  border-radius: 26px;
  padding: 24px;
}

.publication-card h3 {
  margin-bottom: 0;
  font-size: 1.16rem;
}

.publication-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.92rem;
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.publication-links a {
  color: var(--accent);
  font-weight: 800;
}

.contact-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border-radius: 34px;
  padding: 42px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-weight: 800;
}

.footer {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0 40px;
  font-size: 0.92rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .hero,
  .split-section,
  .stats-section,
  .timeline,
  .research-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 68px;
  }

  .section {
    padding: 64px 0;
  }

  .section-heading,
  .contact-section {
    align-items: stretch;
    flex-direction: column;
  }
}