/* ============================================================
   Clean single-accent theme — restrained, mostly neutral
   ============================================================ */
:root {
  --bg: #ffffff;
  --fg: #1f2430;
  --muted: #5e6573;
  --faint: #99a0ad;
  --line: #ebedf1;
  --card: #ffffff;

  --accent: #4f5bd5;        /* one calm indigo accent */
  --accent-dark: #3a45b0;
  --accent-soft: #eef0fb;

  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --maxw: 940px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 2px; }

/* ===== Header / nav ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { font-size: 1.05rem; font-weight: 700; color: var(--fg); letter-spacing: -0.01em; }
.nav-links { display: flex; gap: 24px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--muted); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-links a.current { color: var(--accent); }
.nav-toggle { display: none; background: none; border: none; font-size: 1.3rem; cursor: pointer; color: var(--fg); }

/* ===== Layout ===== */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 28px 20px; }

/* Single-page sections */
section[id] { scroll-margin-top: 76px; }
section + section { margin-top: 8px; }
.lead { margin-top: 2px; }
.see-all { margin-top: 16px; font-size: 0.92rem; color: var(--muted); }

.page-title {
  font-size: 2.1rem; font-weight: 700; letter-spacing: -0.02em;
  margin: 30px 0 10px;
}
h2 {
  font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em;
  margin: 44px 0 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
h3 { font-size: 1.08rem; font-weight: 600; margin: 20px 0 6px; }
p { margin: 0 0 15px; }

/* ===== Home hero ===== */
.hero { display: flex; gap: 36px; align-items: flex-start; padding: 28px 0 8px; }
.hero-photo img {
  width: 144px; height: 200px; object-fit: cover;
  border-radius: 10px; border: 1px solid var(--line);
}
.hero-text h1 { font-size: 2.3rem; font-weight: 700; letter-spacing: -0.03em; margin: 0 0 8px; line-height: 1.08; }
.hero-text .role { margin: 0 0 12px; }
.hero-text .role b { font-weight: 600; }
.affil { color: var(--muted); font-size: 0.92rem; margin: 0 0 14px; }
.affil a { color: var(--muted); }
.affil a:hover { color: var(--accent); }

.profile-links {
  display: flex; flex-wrap: wrap; gap: 8px;
  list-style: none; margin: 12px 0 0; padding: 0;
}
.profile-links a {
  display: inline-block; padding: 5px 14px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.85rem; font-weight: 600;
}
.profile-links a:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* ===== Lists ===== */
ul.tight { margin: 0 0 14px; padding-left: 20px; }
ul.tight li { margin-bottom: 5px; }
ul.tight li::marker { color: var(--faint); }

/* Interests — vertical list, one topic per row */
.interests { display: flex; flex-direction: column; list-style: none; margin: 4px 0 8px; padding: 0; }
.interests li {
  position: relative; padding: 4px 0 4px 20px;
  font-size: 0.96rem; font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.interests li:last-child { border-bottom: none; }
.interests li::before {
  content: ""; position: absolute; left: 2px; top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}

/* News */
.news { list-style: none; margin: 0; padding: 0; }
.news li { padding: 14px 0; border-bottom: 1px solid var(--line); display: flex; gap: 20px; }
.news li:last-child { border-bottom: none; }
.news .date {
  flex: none; min-width: 100px; color: var(--accent);
  font-size: 0.8rem; font-weight: 600; padding-top: 2px;
}
.news .what { margin: 0; }

/* ===== Research ===== */
.research-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 4px; }
.research-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 22px 22px 20px;
}
.rc-icon {
  width: 44px; height: 44px; border-radius: 11px;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 14px;
}
.rc-icon svg { width: 24px; height: 24px; }
.research-card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.research-card > p { margin: 0 0 12px; font-size: 0.95rem; color: var(--muted); }
.research-card > p b { color: var(--fg); font-weight: 600; }
.research-card ul.tight { margin: 0; font-size: 0.92rem; }
.research-card ul.tight li { margin-bottom: 7px; }
.research-card ul.tight li:last-child { margin-bottom: 0; }

/* ===== People ===== */
.people-group { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.person {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px;
}
.person .name { font-weight: 600; }
.person .meta { color: var(--muted); font-size: 0.87rem; margin-top: 3px; }
.person .meta .after { color: var(--accent); }
.person .meta a { color: var(--muted); }
.person .meta a:hover { color: var(--accent); }

/* ===== Publications ===== */
.pub-list { margin: 0; padding: 0; list-style: none; counter-reset: pub; }
.pub-list li {
  position: relative; padding: 13px 0 13px 34px;
  border-bottom: 1px solid var(--line);
}
.pub-list li:last-child { border-bottom: none; }
.pub-list li::before {
  counter-increment: pub; content: counter(pub);
  position: absolute; left: 0; top: 15px;
  width: 22px; height: 22px; line-height: 22px; text-align: center;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 6px; font-size: 0.76rem; font-weight: 700;
}
.pub-list i { color: var(--muted); }
.pub-list .me { color: var(--fg); font-weight: 700; }
.taglink {
  font-size: 0.78rem; font-weight: 600;
  margin-left: 5px; padding: 1px 9px; border-radius: 6px;
  background: var(--accent-soft); color: var(--accent);
}
.taglink:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* ===== Teaching ===== */
.teach-block { margin-bottom: 18px; }
.teach-block .inst { font-weight: 600; }

/* ===== Footer ===== */
.site-footer {
  max-width: var(--maxw); margin: 44px auto 0;
  padding: 24px 28px 50px; border-top: 1px solid var(--line);
  color: var(--faint); font-size: 0.82rem;
}

/* ===== Mobile ===== */
@media (max-width: 660px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 6px 28px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links li { padding: 8px 0; }
  .hero { flex-direction: column; gap: 20px; padding-top: 44px; }
  .research-grid { grid-template-columns: 1fr; }
  .people-group { grid-template-columns: 1fr; }
  .news li { flex-direction: column; gap: 3px; }
}