/* ===== Theme tokens ===== */
:root {
  --bg: #ffffff;
  --bg-gradient-top: #eef1fb;
  --bg-gradient-mid: #f7f8fd;
  --text: #1f2328;
  --text-soft: #6b7280;
  --text-faint: #9aa1ab;
  --accent: #2f6df0;
  --accent-soft: #3b82f6;
  --line: #e7e9ee;
  --card: #ffffff;
  --card-hover: #f7f8fb;
  --serif: "EB Garamond", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
  --bg: #0e1116;
  --bg-gradient-top: #14182260;
  --bg-gradient-mid: #0e1116;
  --text: #e6e8eb;
  --text-soft: #9aa3af;
  --text-faint: #6b7480;
  --accent: #6ea0ff;
  --accent-soft: #8ab4ff;
  --line: #232934;
  --card: #161b22;
  --card-hover: #1c222b;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(180deg, var(--bg-gradient-top) 0%, var(--bg-gradient-mid) 280px, var(--bg) 520px);
  color: var(--text);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}

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

/* ===== Top navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 16px 6vw;
  backdrop-filter: saturate(160%) blur(10px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background-color .25s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }

.nav .brand {
  font-family: var(--serif);
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: .2px;
}
.nav .divider { color: var(--text-faint); margin: 0 4px; }

.nav .links {
  display: flex;
  gap: 18px;
  font-family: var(--sans);
  font-size: .92rem;
}
.nav .links a { color: var(--text-soft); }
.nav .links a:hover { color: var(--accent); text-decoration: none; }
.nav .links a.active { color: var(--accent); }

.nav .spacer { flex: 1; }

.nav .icons { display: flex; align-items: center; gap: 14px; }
.nav .icons a, .nav .icons button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-soft);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.nav .icons a:hover, .nav .icons button:hover { color: var(--accent); }
.nav .icons svg { width: 19px; height: 19px; }

/* ===== Layout ===== */
.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 56px 28px 80px;
}

/* ===== Hero ===== */
.hero { display: flex; gap: 22px; align-items: center; }
.hero img.avatar {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 6px 22px rgba(20, 30, 60, .14);
  flex-shrink: 0;
}
.hero .who h1 {
  margin: 0 0 4px;
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: .3px;
}
.hero .who .role { margin: 0; color: var(--text-soft); font-size: 1.02rem; }

.bio { margin-top: 26px; text-align: justify; }
.bio p { margin: 0 0 16px; }
.bio .hl { color: var(--accent); font-style: italic; font-weight: 600; }
.bio b { font-weight: 600; }

.location {
  margin-top: 14px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--text-faint);
  font-size: .95rem;
  display: flex;
  align-items: center;
  gap: 7px;
}
.location svg { width: 15px; height: 15px; }

/* ===== Contact row ===== */
.contact {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin: 30px 0 8px;
  font-family: var(--sans);
  font-size: .92rem;
}
.contact .item { display: inline-flex; align-items: center; gap: 8px; color: var(--text); }
.contact .item svg { width: 17px; height: 17px; color: var(--text-soft); }
.contact a.item:hover, .contact button.item:hover { color: var(--accent); text-decoration: none; }
.contact button.item { background: none; border: none; cursor: pointer; font: inherit; }
.contact .copy-btn {
  background: none; border: none; cursor: pointer; color: var(--text-faint);
  display: inline-flex; padding: 2px;
}
.contact .copy-btn:hover { color: var(--accent); }
.contact .copy-btn svg { width: 14px; height: 14px; }

/* ===== Sections ===== */
.section { margin-top: 48px; }
.section > h2 {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 0 0 18px;
  letter-spacing: .3px;
}

/* Publications */
.pub {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  margin-bottom: 14px;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.pub:hover { background: var(--card-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(20,30,60,.08); }
.pub .venue {
  display: inline-block;
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .4px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 3px 9px;
  border-radius: 999px;
  margin-bottom: 8px;
}
.pub .title { font-weight: 600; font-size: 1.08rem; line-height: 1.4; }
.pub .authors { color: var(--text-soft); font-size: .98rem; margin-top: 3px; }
.pub .authors .me { color: var(--text); font-weight: 600; }
.pub .meta { color: var(--text-faint); font-size: .92rem; font-style: italic; margin-top: 2px; }
.pub .tags { margin-top: 9px; font-family: var(--sans); font-size: .85rem; display: flex; gap: 10px; flex-wrap: wrap; }
.pub .tags a {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border: 1px solid var(--line); border-radius: 7px; color: var(--text-soft);
}
.pub .tags a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* Generic timeline-ish entries (education / honors / projects) */
.entry { margin-bottom: 18px; }
.entry .row { display: flex; justify-content: space-between; gap: 16px; align-items: baseline; }
.entry .org { font-weight: 600; }
.entry .date { color: var(--text-faint); font-size: .9rem; font-family: var(--sans); white-space: nowrap; }
.entry .desc { color: var(--text-soft); font-size: .98rem; margin-top: 2px; }
.entry .desc .award { color: var(--text); font-weight: 600; }

/* Project cards */
.project {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  margin-bottom: 18px;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.project:hover { background: var(--card-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(20,30,60,.08); }
a.project, a.project:hover, a.project * { text-decoration: none; }
.project h3 { margin: 0 0 4px; font-size: 1.18rem; font-weight: 600; }
.project .sub { color: var(--text-faint); font-family: var(--sans); font-size: .85rem; margin-bottom: 10px; }
.project p { margin: 0 0 8px; }

.back-link {
  font-family: var(--sans);
  font-size: .92rem;
  color: var(--text-soft);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.back-link svg { width: 15px; height: 15px; }

/* Footer */
.footer {
  margin-top: 64px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--text-faint);
  font-family: var(--sans);
  font-size: .85rem;
}

/* Toast for copy */
.toast {
  position: fixed;
  bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg);
  padding: 9px 18px; border-radius: 999px; font-family: var(--sans); font-size: .85rem;
  opacity: 0; pointer-events: none; transition: opacity .25s ease, transform .25s ease;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Responsive */
@media (max-width: 640px) {
  body { font-size: 17px; }
  .nav { padding: 14px 18px; gap: 12px; }
  .nav .links { display: none; }
  .hero { flex-direction: row; }
  .hero img.avatar { width: 78px; height: 78px; }
  .hero .who h1 { font-size: 1.5rem; }
  .contact { gap: 18px; }
}