:root {
  --bg: #fdfdfc;
  --surface: #f5f4f1;
  --text: #1c1b19;
  --muted: #6a675f;
  --faint: #dbd8d1;
  --accent: #7a4b2a;
  --measure: 68ch;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161513;
    --surface: #201f1c;
    --text: #e8e6e1;
    --muted: #9c988e;
    --faint: #35332e;
    --accent: #d19a6a;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--faint);
  margin-bottom: 3rem;
}

.masthead .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}

.brand {
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.94rem;
}

nav a:hover, nav a[aria-current="page"] { color: var(--text); }
nav a[aria-current="page"] { font-weight: 600; }

/* ---------- headings ---------- */

h1 {
  font-family: var(--serif);
  font-size: 2.4rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

h2 {
  font-size: 1.28rem;
  letter-spacing: -0.01em;
  margin: 3.5rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--faint);
}

h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.35;
  margin: 0 0 0.6rem;
}

.page-title { margin-bottom: 2rem; }
.page-title h1 { font-size: 1.9rem; }
.page-title p { color: var(--muted); margin: 0; }

/* ---------- hero ---------- */

/* Narrow first: photo above the name. */
.hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.hero-text { min-width: 0; }

.hero-photo {
  width: 110px;
  height: 110px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--surface);
}

/* Wider: float the photo so a long tagline wraps beside it and then reclaims
   the full measure, instead of running down a column the photo narrowed. */
@media (min-width: 34.0625rem) {
  .hero { display: block; }
  .hero::after { content: ""; display: table; clear: both; }

  .hero-photo {
    float: right;
    width: 150px;
    height: 150px;
    margin: 0 0 1rem 2rem;
  }
}

.name-zh {
  font-size: 0.62em;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-left: 0.15em;
  white-space: nowrap;
}

.hero .role { color: var(--muted); margin: 0 0 1.25rem; }

.hero .tagline {
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.5;
  margin: 0;
}

/* ---------- questions ---------- */

.question {
  margin: 0 0 2.5rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--faint);
}

.question:hover { border-left-color: var(--accent); }
.question h3 { color: var(--text); }
.question > p { margin: 0 0 0.9rem; }

.pub-refs { list-style: none; margin: 0; padding: 0; }

.pub-ref {
  font-size: 0.92rem;
  line-height: 1.45;
  margin-bottom: 0.4rem;
  padding-left: 1rem;
  text-indent: -1rem;
}

.pub-ref::before { content: "→ "; color: var(--muted); }
.pub-ref-meta { color: var(--muted); display: block; }

/* ---------- topics & publications ---------- */

.topic-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--surface);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.topic-nav a { text-decoration: none; font-size: 0.94rem; }
.topic-nav a:hover { text-decoration: underline; }

.count {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}

.topic-blurb { color: var(--muted); margin: 0 0 1.25rem; font-size: 0.96rem; }

.pubs { list-style: none; margin: 0; padding: 0; }

.pub { margin-bottom: 1.5rem; scroll-margin-top: 1.5rem; }
.pub:target { background: var(--surface); border-radius: 4px; padding: 0.6rem 0.8rem; margin-left: -0.8rem; }

.pub-title { font-weight: 600; line-height: 1.4; }
.pub-authors { color: var(--muted); font-size: 0.93rem; }
.pub-authors strong { color: var(--text); font-weight: 600; }

.pub-meta {
  font-size: 0.9rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem 0.5rem;
}

.pub-meta .venue { font-style: italic; }
.pub-meta .ref { font-variant-numeric: tabular-nums; }
.pub-meta .links { margin-left: auto; white-space: nowrap; }
.pub-meta .sep { margin: 0 0.4rem; color: var(--faint); }

/* ---------- software, news, contact ---------- */

.software { margin-bottom: 2rem; }
.software h3 { font-family: var(--font); font-size: 1rem; font-weight: 600; }
.software p { margin: 0 0 0.4rem; }
.accompanies { font-size: 0.9rem; color: var(--muted); }

.news { list-style: none; margin: 0; padding: 0; }

.news li {
  display: flex;
  gap: 1rem;
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.news-date {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  flex: 0 0 3.2rem;
}

.contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.error { color: var(--accent); }

/* ---------- footer ---------- */

footer {
  margin-top: 5rem;
  border-top: 1px solid var(--faint);
  padding: 1.5rem 0 3rem;
  font-size: 0.88rem;
  color: var(--muted);
}

footer a { color: var(--muted); }

/* ---------- narrow screens ---------- */

@media (max-width: 34rem) {
  body { font-size: 16px; }
  h1 { font-size: 1.9rem; }
  .masthead .wrap { flex-direction: column; align-items: flex-start; }
  .pub-meta .links { margin-left: 0; width: 100%; }
}