:root {
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --text: #1f2937;
  --muted: #6b7280;
  --bg: #ffffff;
  --card: #f9fafb;
  --border: #e5e7eb;
  --maxw: 1080px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Navbar */
.nav {
  border-bottom: 1px solid var(--border);
  background: #fff;
}
.nav {
  position: sticky; top: 0; z-index: 10;
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.5rem;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.nav-links { display: flex; gap: 1.4rem; }
.nav-links a { color: var(--muted); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-links a.active { color: var(--accent); }

/* Container */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

/* Hero */
.hero {
  display: grid; grid-template-columns: 1fr 240px; gap: 3rem;
  align-items: center; padding: 3rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: 2.8rem; margin: 0 0 0.3rem; letter-spacing: -0.02em; }
.hero .subtitle { color: var(--muted); font-size: 1.1rem; margin-bottom: 1.2rem; }
.hero .bio { color: var(--text); max-width: 640px; }
.hero img { width: 100%; border-radius: 16px; box-shadow: 0 16px 40px rgba(0,0,0,0.10); }
.badges { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.2rem 0; }
.badge {
  background: var(--accent-soft); color: var(--accent);
  padding: 0.3rem 0.7rem; border-radius: 6px;
  font-size: 0.8rem; font-weight: 500;
  display: inline-block;
}
.links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.2rem; }
.links a {
  display: inline-block; padding: 0.5rem 1rem;
  background: var(--accent); color: #fff; border-radius: 8px;
  font-size: 0.85rem; font-weight: 500;
}
.links a:hover { background: #4338ca; text-decoration: none; }
.links a.secondary { background: var(--accent-soft); color: var(--accent); }

/* Section */
section { padding: 2.5rem 0; }
section h2 {
  font-size: 1.6rem; margin: 0 0 1.2rem;
  padding-bottom: 0.5rem; border-bottom: 2px solid var(--accent-soft);
}

/* Cards */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.3rem 1.5rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.06); }
.card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

/* Articles */
.article {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.3rem; margin-bottom: 1rem;
  background: var(--card); border-radius: 0 10px 10px 0;
}
.article .meta { color: var(--muted); font-size: 0.8rem; margin-bottom: 0.3rem; }
.article h4 { margin: 0 0 0.3rem; font-size: 1.05rem; }
.article .authors { color: var(--muted); font-size: 0.85rem; font-style: italic; margin-bottom: 0.5rem; }
.article a { font-size: 0.85rem; }

/* Footer */
footer {
  margin-top: 3rem; padding: 2rem 0;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.85rem; text-align: center;
}

/* TOC */
.toc { list-style: none; padding: 0; margin: 0; position: sticky; top: 80px; }
.toc li { margin-bottom: 0.4rem; }
.toc a { color: var(--muted); font-size: 0.9rem; }
.toc a:hover { color: var(--accent); }

/* Publications list */
.pub-list { list-style: none; padding: 0; }
.pub-list li {
  padding: 1rem 0; border-bottom: 1px solid var(--border);
}
.pub-list li:last-child { border-bottom: none; }
.pub-list .title { font-weight: 600; }
.pub-list .meta { color: var(--muted); font-size: 0.85rem; margin-top: 0.3rem; }

/* Responsive */
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; }
  .hero img { max-width: 200px; margin: 0 auto; display: block; }
  .hero h1 { font-size: 2rem; }
  .nav-links { gap: 0.8rem; font-size: 0.85rem; }
}