:root {
  --bg: #fcfbf8;
  --ink: #1f1f1d;
  --muted: #6b6a66;
  --rule: #e3e1db;
  --accent: #7a1f2b;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { font-size: 17px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  transition: text-decoration-color .15s;
}
a:hover { text-decoration-color: var(--accent); }

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
header {
  padding: 40px 0 28px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px 24px;
  border-bottom: 1px solid var(--rule);
}
.site-name {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .01em;
  text-decoration: none;
}
nav { font-family: var(--sans); font-size: .88rem; }
nav a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--muted);
}
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }
nav a.lang {
  padding-left: 20px;
  border-left: 1px solid var(--rule);
}
nav a[aria-current="page"] {
  border-bottom: 1.5px solid var(--accent);
  padding-bottom: 2px;
}

main { padding: 48px 0 40px; }

h1 {
  font-size: 1.9rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -.01em;
  margin: 0 0 6px;
}
.subtitle {
  font-family: var(--sans);
  font-size: .92rem;
  color: var(--muted);
  margin: 0 0 32px;
}
.subtitle a { color: var(--muted); }

h2 {
  font-family: var(--sans);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 44px 0 16px;
}
h2:first-of-type { margin-top: 0; }

p { margin: 0 0 1.1em; }

/* about layout */
.intro {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 40px;
  align-items: start;
}
.intro img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 2px;
}
@media (max-width: 640px) {
  .intro { grid-template-columns: 1fr; }
  .intro img { width: 160px; order: -1; }
  html { font-size: 16px; }
}

/* contact */
.contact {
  font-family: var(--sans);
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.9;
}
.contact a { color: var(--ink); }

/* publications */
.pubs { list-style: none; padding: 0; margin: 0; }
.pubs li {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}
.pubs li:last-child { border-bottom: none; }
.pub-title { display: block; }
.pub-meta {
  display: block;
  font-family: var(--sans);
  font-size: .86rem;
  color: var(--muted);
  margin-top: 2px;
}
.pub-meta a { color: var(--muted); }
.pub-meta em { font-style: italic; }
.me { font-weight: 600; }

.note {
  font-family: var(--sans);
  font-size: .85rem;
  color: var(--muted);
}

footer {
  border-top: 1px solid var(--rule);
  padding: 24px 0 40px;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--muted);
}

/* Chinese page */
body.zh {
  font-family: "Source Serif 4", "Noto Serif TC", "PingFang TC", "Songti TC", serif;
  line-height: 1.85;
  letter-spacing: .01em;
}
body.zh h1 { font-weight: 500; }
body.zh .contact, body.zh nav, body.zh .subtitle, body.zh h2, body.zh footer {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Segoe UI", Helvetica, Arial, sans-serif;
}