*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'DM Sans', sans-serif; color: #1a1a1a; background: #fff; }

/* All content constrained to the same width */
.vc { max-width: 900px; margin: 0 auto; padding: 0 44px; }

/* Offset anchor targets below the sticky nav */
section { scroll-margin-top: 66px; }

/* ── NAV ──────────────────────────────────────── */
#site-nav {
  background: #fff;
  border-bottom: 1px solid #dde1e8;
  position: sticky;
  top: 0;
  z-index: 100;
}
#site-nav .vc {
  height: 58px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-name {
  font-size: 18px;
  font-weight: 600;
  color: #0f1729;
  text-decoration: none;
}
.nav-name:hover { color: #1479FB; }
#site-nav ul { display: flex; gap: 22px; list-style: none; }
#site-nav ul a {
  color: #555;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
#site-nav ul a:hover { color: #0f1729; }
.nav-lab {
  font-size: 12px !important;
  font-weight: 700 !important;
  letter-spacing: 1px !important;
  color: #fff !important;
  background: #1479FB;
  padding: 5px 11px !important;
  border-radius: 4px;
  text-transform: none !important;
}
.nav-lab:hover { background: #0d68e0; color: #fff !important; }

/* ── HERO (About) ─────────────────────────────── */
#about { background: #0f1729; }
#about .vc {
  padding-top: 64px;
  padding-bottom: 64px;
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 52px;
  align-items: center;
}
.hero-text h1 {
  font-size: 44px;
  font-weight: 700;
  color: #fff;
  line-height: 1.05;
  margin-bottom: 10px;
}
.hero-pos { font-size: 15px; color: #A5B2C9; margin-bottom: 22px; }
.hero-text p {
  font-size: 15px;
  line-height: 1.75;
  color: #E3E7EE;
  margin-bottom: 12px;
}
.hero-text a { color: #73cbf2; text-decoration: none; }
.hero-text a:hover { text-decoration: underline; }
.hero-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}
.hero-links a {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 6px 14px;
  border-radius: 4px;
}
.hero-links a:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.65);
}
#about img {
  width: 100%;
  border-radius: 5px;
  display: block;
}

/* ── BODY SECTIONS ───────────────────────────── */
.body-sec .vc {
  padding-top: 52px;
  padding-bottom: 52px;
  border-bottom: 1px solid #e8ecf4;
}
.body-sec:last-of-type .vc { border-bottom: none; }
.sec-title {
  font-size: 24px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #0f1729;
  margin-bottom: 6px;
}
.sec-rule {
  width: 44px;
  height: 3px;
  background: #1479FB;
  border-radius: 2px;
  margin-bottom: 28px;
}
.body-sec p {
  font-size: 15px;
  line-height: 1.75;
  color: #444;
  margin-bottom: 12px;
}
.body-sec a { color: #1479FB; text-decoration: none; }
.body-sec a:hover { text-decoration: underline; }

/* ── APPLY BOX ───────────────────────────────── */
.apply-box {
  background: #DCF2FC;
  border-radius: 6px;
  padding: 20px 24px;
}
.apply-box p { margin: 0; color: #0f1729; }

/* ── RESEARCH CARDS ──────────────────────────── */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.research-card {
  border: 1px solid #dde4f0;
  border-top: 3px solid #1479FB;
  border-radius: 5px;
  overflow: hidden;
}
.research-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}
.rc-body { padding: 18px 20px; }
.research-card h4 {
  font-size: 15px;
  font-weight: 600;
  color: #0f1729;
  margin-bottom: 8px;
  line-height: 1.4;
}
.research-card p {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
  margin: 0;
}
.research-sub-title {
  font-size: 18px;
  font-weight: 700;
  color: #0f1729;
  margin-top: 40px;
  margin-bottom: 16px;
}
.research-sub-title:first-of-type { margin-top: 0; }

/* ── PUBLICATIONS ────────────────────────────── */
.pub {
  padding: 13px 0;
  border-bottom: 1px solid #e8ecf4;
  font-size: 14px;
  line-height: 1.7;
  color: #444;
}
.pub:last-of-type { border-bottom: none; }
.pub-venue {
  display: block;
  font-size: 11px;
  color: #aaa;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 3px;
}
.pub a { color: #444; text-decoration: underline; }
.pub a:hover { color: #1479FB; }
.award {
  display: block;
  width: fit-content;
  font-size: 11px;
  font-weight: 600;
  background: #DCF2FC;
  color: #003459;
  padding: 2px 7px;
  border-radius: 3px;
  margin-top: 5px;
  white-space: nowrap;
}

/* ── TEACHING ────────────────────────────────── */
.course {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
  padding: 20px 0;
  border-bottom: 1px solid #e8ecf4;
  align-items: start;
}
.course:last-child { border-bottom: none; }
.course img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 5px;
  display: block;
}
.course h4 {
  font-size: 14px;
  font-weight: 600;
  color: #0f1729;
  margin-bottom: 6px;
}
.course p { font-size: 13px; color: #777; margin: 0; line-height: 1.55; }

/* ── PEOPLE ──────────────────────────────────── */
.people-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.people-group h4 {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: #A5B2C9;
  margin-bottom: 12px;
}
.people-group ul { list-style: none; }
.people-group li {
  font-size: 15px;
  color: #333;
  padding: 10px 0;
  border-bottom: 1px solid #e8ecf4;
}
.people-group li:last-child { border-bottom: none; }
.advisee-role {
  font-size: 11px;
  color: #A5B2C9;
  font-weight: 400;
  margin-left: 6px;
}

/* ── FOOTER ──────────────────────────────────── */
footer {
  text-align: center;
  padding: 24px 0;
  font-size: 13px;
  color: #A5B2C9;
  background: #0f1729;
}

/* ── VIDEO ───────────────────────────────────── */
.video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: 0 auto;
  border-radius: 6px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.10);
  overflow: hidden;
}
.video-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

/* ── HAMBURGER TOGGLE ────────────────────────── */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: #0f1729;
  padding: 4px 6px;
  line-height: 1;
}
.nav-toggle:hover { color: #1479FB; }

/* ── RESPONSIVE ──────────────────────────────── */
@media (max-width: 800px) {
  #about .vc {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 48px;
    padding-bottom: 48px;
  }
  #about img { max-width: 200px; }
  .hero-text h1 { font-size: 34px; }
  .research-grid { grid-template-columns: 1fr; }
  .people-cols { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 700px) {
  .nav-toggle { display: block; }
  #site-nav ul {
    display: none;
    position: absolute;
    top: 58px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 6px 0;
    background: #fff;
    border-bottom: 1px solid #dde1e8;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    z-index: 99;
  }
  #site-nav ul.open { display: flex; }
  #site-nav ul li { width: 100%; }
  #site-nav ul a {
    display: block;
    padding: 11px 24px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  .nav-lab {
    background: none !important;
    color: #1479FB !important;
    border-radius: 0 !important;
    padding: 11px 24px !important;
    font-size: 14px !important;
    letter-spacing: 0.5px !important;
  }
  .nav-lab:hover { background: none !important; color: #0d68e0 !important; text-decoration: underline; }
}
@media (max-width: 560px) {
  .vc { padding: 0 20px; }
  section { scroll-margin-top: 58px; }
  .research-grid { grid-template-columns: 1fr; }
}