/* Wandong (Jim) Sun — personal homepage
   Layout inspired by jonbarron.info (with permission per its footer),
   with additions: highlights video grid, news list, star badges. */

:root {
  --text: #1f1f1f;
  --muted: #555;
  --link: #1367a7;
  --accent-bg: #ffffd0;      /* Barron-style highlight yellow */
  --rule: #e5e5e5;
  --badge-bg: #f2f2f2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #ffffff;
  color: var(--text);
  font-family: "Helvetica Neue", Helvetica, Arial, "Segoe UI", sans-serif;
  font-size: 15.5px;
  line-height: 1.55;
}

.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

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

/* ---------- header ---------- */

.header {
  display: flex;
  gap: 28px;
  align-items: center;
  padding: 12px 0 8px;
}

.header-text { flex: 1 1 auto; }

.name {
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 2px;
}
.name .zh {
  margin-left: 10px;
}

.tagline {
  color: var(--muted);
  margin: 0 0 14px;
  font-size: 15px;
}

.bio p { margin: 0 0 10px; }

.jobmarket {
  font-style: italic;
}

.links {
  margin-top: 14px;
  font-size: 15px;
}
.links a { white-space: nowrap; }
.links .wechat { white-space: nowrap; }
.links .sep { color: #bbb; padding: 0 6px; }

.portrait {
  flex: 0 0 172px;
}
.portrait img, .portrait svg {
  width: 172px;
  height: 172px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

/* ---------- sections ---------- */

section { margin-top: 34px; }

h2 {
  font-size: 21px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}

/* ---------- highlights ---------- */

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
@media (max-width: 700px) {
  .highlights-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 420px) {
  .highlights-grid { grid-template-columns: 1fr; }
}
.highlight-card {
  display: block;
  color: inherit;
}
.highlight-card video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
  background: #000;
  display: block;
}
.highlight-card figcaption {
  font-size: 13.5px;
  color: var(--muted);
  margin-top: 6px;
  text-align: center;
}
.highlight-card:hover figcaption { color: var(--link); }
.highlights-note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 10px;
  text-align: center;
}

/* ---------- news ---------- */

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.news-list li {
  padding: 3px 0;
  display: flex;
  gap: 10px;
}
.news-date {
  flex: 0 0 74px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.tag-new {
  background: #c62828;
  color: #fff;
  font-size: 10.5px;
  font-weight: 700;
  border-radius: 3px;
  padding: 1px 5px;
  margin-left: 6px;
  vertical-align: 2px;
  letter-spacing: 0.5px;
}

/* ---------- publications ---------- */

.pub {
  display: flex;
  gap: 18px;
  padding: 14px 12px;
  border-radius: 8px;
  margin: 0 -12px;
}
.pub.selected { background: var(--accent-bg); }

.pub-thumb {
  flex: 0 0 190px;
  align-self: center;
}
.pub-thumb video, .pub-thumb img, .pub-thumb svg {
  width: 190px;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 6px;
  background: #f0f0f0;
  display: block;
}

.pub-body { flex: 1 1 auto; }

.pub-title {
  font-weight: 700;
  font-size: 16px;
}
.pub-authors { margin: 2px 0; }
.pub-authors .me { font-weight: 700; }

.pub-venue { margin: 2px 0; }
.venue-badge {
  background: var(--badge-bg);
  border-radius: 4px;
  padding: 1px 7px;
  font-size: 13.5px;
  font-weight: 600;
}
.award {
  color: #b3261e;
  font-weight: 600;
  font-size: 13.5px;
  margin-left: 6px;
}

.pub-links { font-size: 14px; margin: 4px 0 6px; }
.pub-links .sep { color: #bbb; padding: 0 4px; }

.pub-tldr {
  font-size: 14px;
  color: var(--muted);
  margin: 4px 0 0;
}

.legend {
  font-size: 13px;
  color: var(--muted);
  margin: 4px 0 12px;
}
.legend .hl {
  background: var(--accent-bg);
  padding: 0 4px;
  border-radius: 3px;
}

/* bibtex toggle */
.bib-toggle {
  cursor: pointer;
  color: var(--link);
}
.bibtex {
  display: none;
  background: #f7f7f7;
  border: 1px solid var(--rule);
  border-radius: 6px;
  font-size: 12.5px;
  padding: 10px 12px;
  margin-top: 8px;
  overflow-x: auto;
  white-space: pre;
}
.bibtex.open { display: block; }

/* compact list for co-authored papers */
.pub-compact {
  margin: 0;
  padding-left: 18px;
}
.pub-compact li { margin-bottom: 10px; font-size: 14.5px; }
.pub-compact .me { font-weight: 700; }

/* ---------- milestones ---------- */

.milestone-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.milestone-list li { margin-bottom: 14px; }
.milestone-list strong { font-size: 15.5px; }
.ms-date {
  color: var(--muted);
  font-size: 13px;
  margin-left: 8px;
  font-variant-numeric: tabular-nums;
}
.ms-desc { font-size: 14.5px; color: var(--muted); }

/* ---------- software ---------- */

.sw {
  display: flex;
  gap: 14px;
  align-items: baseline;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.sw-name { font-weight: 700; font-size: 16px; white-space: nowrap; }
.sw-badges img { vertical-align: middle; }
.sw-desc { flex: 1 1 100%; margin: 2px 0 0; font-size: 14.5px; }

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

footer {
  margin-top: 48px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .header { flex-direction: column-reverse; text-align: center; }
  .portrait { flex-basis: auto; }
  .pub { flex-direction: column; }
  .pub-thumb, .pub-thumb video, .pub-thumb img { width: 100%; flex-basis: auto; }
  .news-list li { flex-direction: column; gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .highlight-card video { display: none; }
}