:root {
  --background: #f8f7f2;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #5b6773;
  --line: #d8d3c7;
  --accent: #123b5d;
  --accent-soft: #e8eef2;
  --max-width: 960px;
  --shadow: 0 10px 30px rgba(24, 39, 58, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(18, 59, 93, 0.05), transparent 220px),
    var(--background);
  line-height: 1.7;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(248, 247, 242, 0.9);
  border-bottom: 1px solid rgba(216, 211, 199, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
}

.site-title {
  display: inline-block;
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text);
}

.site-subtitle {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.98rem;
}

.section {
  padding: 5rem 0;
}

.hero {
  padding-top: 6rem;
}

.hero-grid,
.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.9fr);
  gap: 2.5rem;
}

.hero h1,
.section h2 {
  margin: 0;
  line-height: 1.2;
}

.lead {
  max-width: 62ch;
  margin-top: 0;
  font-size: 1.08rem;
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.9rem;
  font-weight: 700;
}

.profile-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.profile-card {
  padding: 1.5rem;
  align-self: start;
}

.portrait-frame {
  width: 240px;
  height: 240px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 12px 32px rgba(24, 39, 58, 0.12);
  background: var(--accent-soft);
}

.portrait-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center 24%;
}

.profile-card h2,
.paper h3 {
  margin-top: 0;
}

.profile-summary {
  margin-bottom: 1rem;
  text-align: center;
}

.profile-name {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
}

.profile-title {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.profile-university {
  margin: 0.85rem 0 0;
  color: var(--text);
  font-size: 1rem;
}

.profile-affiliation {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list-compact {
  margin-top: 1.2rem;
}

.contact-list li {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}

.contact-list li:last-child {
  border-bottom: 0;
}

.contact-list span:first-child {
  color: var(--muted);
}

.contact-list-compact li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0;
}

.contact-icon {
  width: 1rem;
  min-width: 1rem;
  height: 1rem;
  flex: 0 0 1rem;
  color: var(--muted);
  line-height: 0;
}

.contact-icon svg {
  display: block;
  width: 1rem;
  min-width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 3rem;
  margin-top: 3rem;
}

.hero-interests {
  min-width: 0;
}

.interest-heading {
  margin: 0 0 0.75rem;
  font-size: 1.18rem;
  color: var(--text);
  font-weight: 700;
}

.interest-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.interest-list li {
  padding: 0.3rem 0;
  font-size: 1.08rem;
  color: var(--muted);
}

.cv-heading {
  margin-top: 1.4rem;
}

.section-heading h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.section-content {
  display: grid;
  gap: 1rem;
}

.research-layout {
  display: block;
}

.research-heading {
  margin-bottom: 1.75rem;
}

.research-list {
  display: block;
}

.research-subsection h2 {
  margin: 0 0 1rem;
  font-size: 1.45rem;
  line-height: 1.25;
}

.research-subsection-gap {
  margin-top: 2.5rem;
}

.research-item + .research-item {
  margin-top: 1.75rem;
}

.research-item h3 {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.45;
}

.paper-meta {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.research-item p:last-child {
  margin-bottom: 0;
}

.research-note {
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 760px) {
  .header-inner,
  .hero-grid,
  .section-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid > :first-child {
    order: 2;
  }

  .hero-grid > .profile-card {
    order: 1;
  }

  .site-nav {
    gap: 1rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .hero {
    padding-top: 4rem;
  }

  .contact-list li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .contact-list-compact li {
    gap: 0.75rem;
  }

  .hero-meta {
    gap: 2.25rem;
  }
}