/* =========================================================
   Academic Homepage — sidebar layout, plain typography
   ========================================================= */

:root {
  --bg: #fafafa;              /* warm off-white page bg */
  --fg: #555;                 /* body text — softer dark gray */
  --fg-strong: #222;          /* headings, strong, name */
  --fg-muted: #888;
  --fg-faint: #aaa;
  --accent: #1976D2;          /* Material Blue 700 — lively academic */
  --accent-soft: #6AA3DA;
  --accent-hover: #125EA8;
  --gold: #B8860B;            /* highlight: prestigious awards */
  --red:  #C0392B;            /* highlight: best-paper, etc.  */
  --border: #e5e5e5;
  --surface: #f1f1f1;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 2px 8px rgba(0,0,0,.08);
  --max-w: 1080px;
  --sidebar-w: 260px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: Georgia, "Times New Roman", "Songti SC", serif;
  --mono: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #13141a;
    --fg: #c0c0c0;
    --fg-strong: #e6e6e6;
    --fg-muted: #888;
    --fg-faint: #666;
    --accent: #64B5F6;
    --accent-soft: #90C7F8;
    --accent-hover: #90CAF9;
    --gold: #D4AF37;
    --red:  #E06060;
    --border: #2a2b35;
    --surface: #1c1d26;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
    --shadow-md: 0 2px 8px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

strong { color: var(--fg-strong); font-weight: 600; }
em { font-style: italic; color: var(--fg-strong); }
sup { font-size: .75em; }

::selection { background: var(--accent); color: #fff; }

/* ========== LAYOUT ========== */
.layout {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 2rem;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: 4rem;
  align-items: start;
}

/* ========== SIDEBAR ========== */
.sidebar {
  position: sticky;
  top: 3rem;
  text-align: left;
}

.sidebar__photo {
  display: block;
  width: 100%;
  max-width: 220px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;                 /* circular avatar */
  box-shadow: var(--shadow-md);
  background: var(--border);
  margin-bottom: 1.25rem;
}

.sidebar__name {
  margin: 0 0 .25rem;
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--fg-strong);
  line-height: 1.2;
}

.sidebar__role {
  margin: 0 0 .25rem;
  color: var(--fg);
  font-size: 1rem;
}

.sidebar__affil {
  margin: 0 0 1.25rem;
  color: var(--fg-muted);
  font-size: .92rem;
  line-height: 1.5;
}
.sidebar__affil strong {
  color: var(--accent);
  font-weight: 600;
}

.sidebar__links {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: .93rem;
}
.sidebar__links li {
  display: flex;
  align-items: baseline;
  padding: .25rem 0;
  color: var(--fg);
}
.sidebar__links li i {
  width: 1.4em;
  text-align: center;
  color: var(--fg-muted);
  margin-right: .55rem;
  font-size: .95em;
  flex-shrink: 0;
}
.sidebar__links a {
  color: var(--fg);
}
.sidebar__links a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ========== MAIN ========== */
.main { min-width: 0; }

.main section {
  margin-bottom: 2.25rem;
}

/* The signature L-shape: accent left + soft bottom */
.main h2 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--fg-strong);
  margin: 0 0 1rem;
  padding: 0 0 .5rem .75rem;
  border-left: 2px solid var(--accent);
  border-bottom: 1px solid var(--border);
  letter-spacing: .01em;
}

.main h3 {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--fg-strong);
  margin: 1.25rem 0 .65rem;
  letter-spacing: .01em;
}

.main p { margin: 0 0 .9rem; }

.note {
  color: var(--fg-muted);
  font-size: .85rem;
  margin-top: -.3rem !important;
  margin-bottom: 1rem !important;
}

.muted {
  color: var(--fg-muted);
  font-size: .92rem;
}

/* Highlight utility classes (use in News / Awards) */
.highlight-gold { color: var(--gold); font-weight: 700; }
.highlight-red  { color: var(--red);  font-weight: 700; }

/* ========== ENTRIES (Education / Awards / News) ========== */
.entries {
  list-style: none;
  padding: 0;
  margin: 0;
}
.entries li {
  padding: .35rem 0;
  font-size: .98rem;
  line-height: 1.6;
  color: var(--fg);
}
.entries li strong { color: var(--fg-strong); }
.entries .period {
  color: var(--fg-muted);
  font-size: .88rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.entries .period::before {
  content: " · ";
  color: var(--fg-faint);
  margin: 0 .15rem;
}
.entries--tight li { padding: .18rem 0; }

.entries--with-logo li {
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  padding: .55rem 0;
}
.entries__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex-shrink: 0;
  margin-top: .15rem;
}
.entries__content {
  flex: 1;
  min-width: 0;
}

/* ========== PUBLICATIONS ========== */
.pubs {
  list-style: none;
  padding: 0;
  margin: 0;
}
.pubs li {
  margin-bottom: 1rem;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid transparent;
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
  transition: border-left-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.pubs li:hover {
  border-left-color: var(--accent);
  box-shadow: var(--shadow-md);
}
.pubs__title {
  font-weight: 600;
  color: var(--fg-strong);
  margin-bottom: .15rem;
}
.pubs__title a {
  color: var(--fg-strong);
  text-decoration: none;
}
.pubs__title a:hover {
  color: var(--accent);
  text-decoration: none;
}
.pubs__meta {
  font-size: .95rem;
  color: var(--fg);
  margin-bottom: .15rem;
}
.pubs__venue {
  font-size: .95rem;
  color: var(--fg-strong);
  font-weight: 500;
  margin-bottom: .15rem;
}
.pubs__links {
  font-size: .88rem;
  color: var(--fg-muted);
}
.pubs__links a { color: var(--accent); }

/* ========== FOOTER ========== */
.footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: .85rem;
  color: var(--fg-faint);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 820px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 2rem 1.25rem;
  }
  .sidebar {
    position: static;
    text-align: center;
  }
  .sidebar__photo {
    margin-left: auto;
    margin-right: auto;
    max-width: 160px;
  }
  .sidebar__links li { justify-content: center; }
  .sidebar__links {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .entries li {
    font-size: .95rem;
  }
}

@media (max-width: 600px) {
  .layout {
    padding: 1.75rem 1rem;
    gap: 2rem;
  }
  .sidebar__photo {
    max-width: 140px;
  }
  .sidebar__name {
    font-size: 1.4rem;
  }
  .sidebar__name span { display: inline-block; }   /* keep 李让 inline-clean */

  .main h2 {
    font-size: 1.2rem;
    padding-bottom: .35rem;
  }
  .main h3 {
    font-size: .95rem;
    margin: 1rem 0 .55rem;
  }
  .main section { margin-bottom: 1.75rem; }

  /* Publications cards: tighter padding, slightly smaller text */
  .pubs li {
    padding: 12px 14px;
    margin-bottom: .85rem;
  }
  .pubs__title { font-size: .98rem; }
  .pubs__meta,
  .pubs__venue { font-size: .9rem; }
  .pubs__links {
    font-size: .85rem;
    line-height: 1.85;
  }

  /* Education entries with logos */
  .entries__logo { width: 34px; height: 34px; }
  .entries--with-logo li { gap: .7rem; }
}

@media (max-width: 480px) {
  .entries .period {
    display: block;
    margin-top: .1rem;
    font-size: .82rem;
  }
  .entries .period::before { content: ""; margin: 0; }

  /* prevent very long unbroken strings (like long URLs) from overflowing cards */
  .pubs__title a,
  .pubs__meta,
  .pubs__links { word-break: break-word; }
}