:root {
  --bg: #f6faf9;
  --bg-soft: #edf5f3;
  --paper: #fbfefe;
  --ink: #233645;
  --ink-soft: #516674;
  --muted: #6c828f;
  --line: rgba(62, 102, 113, 0.12);
  --accent: #6f8f98;
  --accent-soft: #91b1ad;
  --accent-deep: #587985;
  --max: 1120px;
  --radius-xl: 28px;
  --radius-lg: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 5%, rgba(193, 225, 221, 0.18), transparent 28%),
    radial-gradient(circle at 100% 8%, rgba(198, 219, 232, 0.18), transparent 30%),
    linear-gradient(180deg, #f9fcfc 0%, #f3f8f7 100%);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.72;
  letter-spacing: -0.01em;
}

img { display: block; max-width: 100%; }

a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  width: min(var(--max), calc(100% - 44px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 252, 251, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 72px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.brand {
  color: var(--ink);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.nav-links a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--accent-deep);
  text-decoration: none;
}

.hero {
  padding: 70px 0 34px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr);
  gap: 62px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  max-width: 680px;
  font-size: clamp(2.95rem, 6vw, 4.75rem);
  font-weight: 650;
  letter-spacing: -0.05em;
}

h1 span {
  color: var(--accent);
  font-weight: 500;
}

h2 {
  font-size: clamp(1.85rem, 3vw, 2.45rem);
  font-weight: 600;
  letter-spacing: -0.03em;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 22px 0 22px;
  color: var(--ink-soft);
  font-size: 1.18rem;
  line-height: 1.52;
}

.lead {
  margin: 0;
  max-width: 700px;
  color: var(--muted);
  font-size: 1.03rem;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.92rem;
  font-weight: 550;
  transition: all 0.16s ease;
}

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

.button.primary {
  background: #dbeceb;
  color: var(--ink);
  border-color: rgba(111, 143, 152, 0.12);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.68);
  color: var(--ink-soft);
  border-color: var(--line);
}

.button.compact {
  margin-top: 20px;
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.portrait {
  width: 100%;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}

.hero-note {
  padding: 20px 22px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.hero-note p { margin: 0; }

.section {
  margin: 26px 0;
  padding: 48px 0;
  border-top: 1px solid var(--line);
}

.soft-section {
  background: linear-gradient(180deg, rgba(238, 246, 244, 0.4), rgba(243, 249, 248, 0.3));
  border-radius: var(--radius-xl);
  border: 1px solid rgba(111, 143, 152, 0.08);
  padding: 48px 0;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(210px, 0.32fr) minmax(0, 1fr);
  gap: 46px;
}

.section-body p {
  color: var(--muted);
}

.large-text {
  margin-top: 0;
  color: var(--ink-soft);
  font-size: 1.12rem;
  line-height: 1.7;
}

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

.section-heading-wide p:last-child {
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.card,
.paper-card,
.featured-paper,
.contact-card {
  background: rgba(255,255,255,0.68);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.card { padding: 22px; }
.card p, .card li { color: var(--muted); }
.card ul { margin: 12px 0 0; padding-left: 1.1rem; }

.featured-paper {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 14px;
  padding: 28px;
  margin-bottom: 18px;
}

.paper-index {
  color: var(--accent);
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.05em;
}

.paper-index.small {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.paper-meta {
  margin-bottom: 8px;
  color: var(--accent-deep);
  font-size: 0.9rem;
  font-weight: 500;
}

.featured-paper p, .paper-card p {
  color: var(--muted);
  margin-bottom: 0;
}

.paper-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.paper-card { padding: 22px; }
.paper-card h3, .featured-paper h3 { margin-bottom: 10px; }

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

.publication-list li {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.publication-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.pub-year {
  color: var(--accent);
  font-weight: 600;
}

.timeline {
  display: grid;
  gap: 2px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.timeline-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.timeline-date {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.92rem;
}

.timeline-item p {
  margin: 8px 0 0;
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.tag-row span {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  background: rgba(255,255,255,0.64);
  font-size: 0.9rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 34px;
  align-items: start;
}

.contact-grid p {
  color: var(--muted);
  max-width: 660px;
}

.contact-card { padding: 24px; }

.contact-card p { margin: 0 0 18px; }
.contact-card p:last-child { margin-bottom: 0; }

.contact-card span {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-weight: 600;
}

.footer {
  padding: 10px 0 34px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 980px) {
  .hero-grid,
  .section-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .card-grid,
  .paper-grid {
    grid-template-columns: 1fr;
  }

  .featured-paper {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(100% - 28px, var(--max));
  }

  .nav {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 0;
  }

  .nav-links { gap: 12px; }

  .hero { padding-top: 44px; }

  h1 {
    font-size: clamp(2.6rem, 14vw, 3.8rem);
  }

  .publication-list li,
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .footer-inner {
    flex-direction: column;
  }
}