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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #333;
  background: #fff;
  margin: 0;
  line-height: 1.65;
  font-size: 15px;
}

a {
  color: #1a5f9e;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ── Navigation ─────────────────────────────────────── */

nav {
  border-bottom: 1px solid #e0e0e0;
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

nav .nav-name {
  font-weight: 600;
  color: #1a1a1a;
  margin-right: auto;
  font-size: 1rem;
}

nav a {
  font-weight: 500;
  color: #555;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

nav a:hover,
nav a.active {
  color: #1a5f9e;
  text-decoration: none;
}

/* ── Container ───────────────────────────────────────── */

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

/* ── Index page ──────────────────────────────────────── */

.profile {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  margin-top: 1rem;
}

.profile img {
  width: 240px;
  flex-shrink: 0;
  border-radius: 4px;
  display: block;
}

.profile-info h1 {
  margin: 0 0 0.15rem;
  font-size: 1.75rem;
  font-weight: 600;
  color: #1a1a1a;
}

.profile-info .title-dept {
  margin: 0 0 1.5rem;
  color: #555;
  line-height: 1.6;
}

.profile-info .title-dept a {
  color: #1a5f9e;
}

.profile-info h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #888;
  margin: 0 0 0.5rem;
  border: none;
}

address {
  font-style: normal;
  color: #444;
  line-height: 1.75;
  font-size: 0.9rem;
}

address a {
  color: #1a5f9e;
}

/* ── Research page ───────────────────────────────────── */

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: #1a1a1a;
  margin: 0 0 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid #1a5f9e;
}

section {
  margin-bottom: 3rem;
}

section h2 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #1a5f9e;
  border-bottom: 1px solid #c5ddf4;
  padding-bottom: 0.5rem;
  margin: 0 0 1.5rem;
}

article.paper {
  margin-bottom: 1.6rem;
  padding-left: 1rem;
  border-left: 3px solid #b8d4ec;
}

article.paper h3 {
  margin: 0 0 0.2rem;
  font-size: 0.97rem;
  font-weight: 500;
  line-height: 1.4;
}

article.paper h3 a {
  color: #123f6b;
}

article.paper h3 a:hover {
  text-decoration: underline;
}

.authors {
  margin: 0 0 0.2rem;
  color: #666;
  font-size: 0.88rem;
}

.venue {
  margin: 0 0 0.45rem;
  font-size: 0.88rem;
  color: #444;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.82rem;
}

.links a {
  color: #1a5f9e;
  border: 1px solid #b8d4ec;
  padding: 0.1rem 0.55rem;
  border-radius: 3px;
  white-space: nowrap;
}

.links a:hover {
  background: #eaf4ff;
  text-decoration: none;
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 640px) {
  nav {
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    padding: 0.75rem 1rem;
  }

  nav .nav-name {
    width: 100%;
    margin-right: 0;
  }

  .container {
    padding: 1.5rem 1rem;
  }

  .profile {
    flex-direction: column;
    gap: 1.5rem;
  }

  .profile img {
    width: 100%;
    max-width: 320px;
  }
}