/* Minimal al-folio-style theme. */

:root {
  --bg: #ffffff;
  --text: #000000;
  --muted: #6c757d;
  --accent: #00356b;
  --rule: #e6e6e6;
  --nav-bg: rgba(255, 255, 255, 0.96);
  --btn-border: #c8c8c8;
  --oral: #b54708;
  --oral-bg: #fdecd9;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1c1c1d;
    --text: #e8e8e8;
    --muted: #9aa0a6;
    --accent: #7fb2e5;
    --rule: #3a3a3c;
    --nav-bg: rgba(28, 28, 29, 0.96);
    --btn-border: #555;
    --oral: #f5a35c;
    --oral-bg: #3a2614;
  }
}
:root[data-theme="dark"] {
  --bg: #1c1c1d;
  --text: #e8e8e8;
  --muted: #9aa0a6;
  --accent: #7fb2e5;
  --rule: #3a3a3c;
  --nav-bg: rgba(28, 28, 29, 0.96);
  --btn-border: #555;
  --oral: #f5a35c;
  --oral-bg: #3a2614;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  transition: background 0.2s, color 0.2s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
b, strong { font-weight: 600; }

.container { max-width: 930px; margin: 0 auto; padding: 0 16px; }

/* Nav */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(6px);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.social a { color: var(--text); font-size: 1.3rem; margin-right: 14px; }
.social a:hover { color: var(--accent); text-decoration: none; }
.nav-links { list-style: none; display: flex; align-items: center; gap: 4px; margin: 0; padding: 0; }
.nav-links a { color: var(--text); padding: 6px 10px; font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
#theme-toggle {
  background: none; border: 0; color: var(--text); cursor: pointer;
  font-size: 1.05rem; padding: 6px 8px;
}
#theme-toggle:hover { color: var(--accent); }

main.container { padding-top: 88px; padding-bottom: 40px; }
section { margin-bottom: 40px; }

/* Header */
.name { font-size: 2.5rem; font-weight: 400; letter-spacing: -0.02em; margin: 0; line-height: 1.2; }
.name b { font-weight: 700; }
.name .zh { font-size: 1.6rem; color: var(--muted); font-weight: 300; }
.tagline { color: var(--muted); margin: 4px 0 24px; }

.profile { float: right; width: 210px; margin: 0 0 16px 32px; text-align: center; }
.profile img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 50%; box-shadow: 0 2px 6px rgba(0,0,0,0.18); display: block; }
.more-info { font-size: 0.85rem; color: var(--muted); margin-top: 10px; line-height: 1.5; }
/* Topics, grouped by research thread. */
.tags { font-size: 0.92rem; line-height: 1.8; margin: -10px 0 26px; }
.tags .sep { color: var(--rule); margin: 0 10px; }
.cv-link { clear: both; }

/* Headings */
h2 {
  font-weight: 600; font-size: 1.45rem; letter-spacing: -0.01em;
  color: var(--accent);
  margin: 36px 0 14px; padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}
h3 { font-weight: 600; font-size: 1.15rem; margin: 22px 0 6px; }
h3.year { color: var(--muted); font-weight: 400; }
/* Research threads: heading on the left, papers on the right. */
.thread-block { display: grid; grid-template-columns: 230px 1fr; gap: 28px; padding: 22px 0; border-top: 1px solid var(--rule); }
.thread-block:first-of-type { border-top: 0; padding-top: 4px; }
.thread-side { position: sticky; top: 72px; align-self: start; }
.thread-side h3 { margin: 0 0 6px; font-size: 1.05rem; }
.thread { color: var(--muted); font-size: 0.95rem; margin: 0; }
.thread-block ol.bib li:first-child { padding-top: 0; }
.note { font-size: 0.85rem; color: var(--muted); font-weight: 300; }

/* News / timeline tables */
table.news { border-collapse: collapse; width: 100%; }
table.news th {
  text-align: left; vertical-align: top; white-space: nowrap;
  font-weight: 600; width: 96px; padding: 5px 16px 5px 0;
}
table.news td { padding: 5px 0; }
.sub { color: var(--muted); font-size: 0.92rem; }

/* Publications */
ol.bib { list-style: none; padding: 0; margin: 0; }
ol.bib li { padding: 10px 0; border-bottom: 1px dashed var(--rule); }
ol.bib li:last-child { border-bottom: 0; }
.bib .title { font-weight: 600; }
.bib .title a { color: var(--text); }
.bib .title a:hover { color: var(--accent); }
.bib .author, .bib .summary { font-size: 0.95rem; }
.bib .summary { color: var(--muted); }
.bib .venue { font-size: 0.92rem; }
.oral {
  color: var(--oral); background: var(--oral-bg); font-weight: 600; font-size: 0.78em;
  padding: 1px 7px; border-radius: 10px; margin-left: 4px;
}
.more { color: var(--accent); cursor: pointer; border-bottom: 1px dotted var(--accent); }
.links { margin-top: 4px; }
.btn {
  display: inline-block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.03em;
  color: var(--text); border: 1px solid var(--btn-border); border-radius: 3px;
  padding: 1px 8px; margin-right: 6px;
}
.btn:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

footer {
  border-top: 1px solid var(--rule);
  color: var(--muted); font-size: 0.85rem; text-align: center; padding: 18px 0;
}

/* Phone */
@media (max-width: 640px) {
  .nav-links li:not(:nth-last-child(-n+2)) { display: none; }
  .profile { float: none; width: auto; margin: 0 auto 16px; }
  .profile img { width: 170px; margin: 0 auto; }
  .name { font-size: 2rem; }
  table.news th { width: 72px; padding-right: 10px; }
  .thread-block { grid-template-columns: 1fr; gap: 10px; }
  .thread-side { position: static; }
}