@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap");

:root {
  --navy: #1e3a8a;
  --navy-dark: #172554;
  --text: #1f2937;
  --muted: #6b7280;
  --bg: #f9fafb;
  --card: #ffffff;
  --border: #e5e7eb;
  --soft-blue: #eff6ff;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius: 22px;
  --max-width: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(30, 58, 138, 0.06), transparent 34rem),
    var(--bg);
  line-height: 1.65;
}
a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--navy-dark); }
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(249, 250, 251, 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.navbar {
  max-width: var(--max-width); margin: 0 auto; padding: 1rem 1.25rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.brand { font-weight: 800; color: var(--navy); letter-spacing: -0.03em; }
.nav-links { display: flex; gap: 0.5rem; }
.nav-links a { padding: 0.55rem 0.9rem; border-radius: 999px; font-weight: 650; color: var(--text); }
.nav-links a.active, .nav-links a:hover { background: var(--navy); color: white; }
main { max-width: var(--max-width); margin: 0 auto; padding: 4.5rem 1.25rem; }
.page-header { margin-bottom: 2.5rem; max-width: 850px; }
.eyebrow { color: var(--navy); font-weight: 800; text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; margin: 0 0 0.55rem; }
h1 { font-size: clamp(2.4rem, 6vw, 5rem); line-height: 1.02; letter-spacing: -0.065em; margin: 0.35rem 0 1rem; }
h2 { color: var(--navy); letter-spacing: -0.04em; font-size: 1.55rem; margin-top: 0; }
p { margin-top: 0; }
.card { background: rgba(255, 255, 255, 0.94); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem; padding: 0.85rem 1.1rem; border-radius: 999px; background: var(--navy); color: white; font-weight: 800; border: 1px solid var(--navy); }
.btn:hover { background: var(--navy-dark); color: white; }
.btn.secondary { background: white; color: var(--navy); }
.btn.secondary:hover { background: var(--soft-blue); }
.hero-grid { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 3rem; align-items: center; min-height: calc(100vh - 145px); }
.portrait-shell { padding: 1rem; }
.portrait-frame { position: relative; overflow: hidden; border-radius: 30px; background: white; }
.profile-image { width: 100%; height: min(72vh, 680px); object-fit: cover; object-position: center 28%; display: block; filter: saturate(0.98) contrast(1.02); }
.portrait-caption { position: absolute; left: 1.1rem; bottom: 1.1rem; right: 1.1rem; padding: 0.9rem 1rem; border-radius: 18px; color: white; background: linear-gradient(135deg, rgba(23, 37, 84, 0.82), rgba(30, 58, 138, 0.72)); backdrop-filter: blur(10px); font-weight: 700; }
.hero-content { padding: 1rem 0; }
.title-line { color: var(--muted); font-size: 1.08rem; margin-bottom: 1.25rem; }
.title-line span { display: block; }
.bio { font-size: 1.06rem; max-width: 700px; }
.badge-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.badge { display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.7rem 0.95rem; border-radius: 999px; background: white; border: 1px solid var(--border); font-weight: 800; box-shadow: 0 8px 20px rgba(15, 23, 42, 0.05); }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin-top: 2rem; }
.stat { padding: 1rem; }
.stat strong { display: block; color: var(--navy); font-size: 1.4rem; line-height: 1; }
.stat span { color: var(--muted); font-size: 0.9rem; }
.cv-actions { margin-bottom: 1.5rem; display: flex; gap: 0.75rem; flex-wrap: wrap; }
.pdf-frame { width: 100%; height: 78vh; border: 0; border-radius: calc(var(--radius) - 8px); background: white; }
.pdf-container { overflow: hidden; padding: 0.75rem; }
.publication-year { margin-top: 3rem; }
.publication-list { display: grid; gap: 1rem; }
.publication { padding: 1.4rem; }
.pub-title { font-weight: 850; color: var(--text); margin-bottom: 0.35rem; font-size: 1.03rem; letter-spacing: -0.015em; }
.pub-authors { color: var(--text); margin-bottom: 0.25rem; }
.pub-venue { color: var(--muted); font-style: italic; margin-bottom: 1rem; }
.pub-actions { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-bottom: 1rem; }
.mini-btn { display: inline-flex; padding: 0.45rem 0.7rem; border-radius: 999px; border: 1px solid var(--border); background: #f8fafc; font-weight: 800; font-size: 0.85rem; }
.paper-preview { border: 1px solid var(--border); border-radius: 16px; overflow: hidden; background: white; }
.paper-preview summary { cursor: pointer; padding: 0.85rem 1rem; font-weight: 850; color: var(--navy); background: linear-gradient(180deg, #ffffff, #f8fafc); }
.paper-preview iframe { width: 100%; height: min(72vh, 760px); border: 0; display: block; background: #f8fafc; }
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.contact-card { padding: 1.5rem; }
.contact-label { color: var(--navy); font-weight: 850; margin-bottom: 0.3rem; }
.contact-value { color: var(--text); }
.footer-note { margin-top: 3rem; color: var(--muted); font-size: 0.92rem; }
@media (max-width: 880px) {
  .navbar { align-items: flex-start; flex-direction: column; }
  .nav-links { width: 100%; overflow-x: auto; padding-bottom: 0.25rem; }
  main { padding-top: 2.5rem; }
  .hero-grid, .contact-grid { grid-template-columns: 1fr; min-height: auto; }
  .profile-image { height: 58vh; }
  .stats-grid { grid-template-columns: 1fr; }
  .pdf-frame { height: 68vh; }
  .paper-preview iframe { height: 520px; }
}
@media (max-width: 520px) {
  .profile-image { height: 430px; }
  .nav-links a { padding: 0.5rem 0.75rem; }
  h1 { font-size: 2.55rem; }
}