:root {
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #555;
  --link: #0b3d91;        /* dark blue */
  --journal: #8b1a1a;     /* dark red */
  --rule: #e2e2e2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #dcdcdc;
    --bg: #16181c;
    --muted: #9aa0a6;
    --link: #7fa8e0;      /* lighter blue for contrast on dark bg */
    --journal: #e39a9a;   /* lighter red for contrast on dark bg */
    --rule: #303338;
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1rem;
  font-size: 1rem;
}

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

/* Header / nav */
header { border-bottom: 1px solid var(--rule); margin-bottom: 2rem; }
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding: 1rem 0;
}
nav a { color: var(--link); }

/* Headings */
h1 { font-size: 1.6rem; line-height: 1.3; margin: 0 0 1rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 0.75rem; }
.section-head {
  font-size: calc(1.2rem + 2px);
  text-decoration: underline;
}
.cjk { font-weight: 400; color: var(--muted); font-size: 1.2rem; }

/* Homepage */
.portrait {
  float: right;
  width: 220px;
  max-width: 40%;
  height: auto;
  margin: 0.2rem 0 1rem 1.5rem;
  border-radius: 4px;
}
.bio p { margin: 0 0 1rem; }
ul.links {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}
.email { color: var(--muted); }

/* Publications */
ul.pub-list, ul.course-list, ul.session-list { list-style: none; padding: 0; margin: 0; }
.pub, .course, .session { margin: 0 0 1.4rem; }
.pub-authors, .pub-venue, .course-meta { color: var(--muted); }
.pub-journal { color: var(--journal); font-style: italic; }
.pub-links { margin-left: 5ch; }              /* ~5-character gap after the venue */
.pub-links a { margin-right: 0.75rem; }
.pub-links a:last-child { margin-right: 0; }
.pub-links-standalone { margin-left: 0; margin-top: 0.15rem; }  /* working papers: own line */
.pub-note { color: var(--muted); font-size: 0.92rem; }
.pub-abstract { margin-top: 0.35rem; }
.pub-abstract summary { color: var(--link); cursor: pointer; }
.pub-abstract p { margin: 0.5rem 0 0; color: var(--muted); }

/* Teaching */
.course { margin: 0 0 0.5rem; }
.course-title { font-weight: 600; }
.course-level, .course-meta { color: var(--muted); }
.course-materials { margin: 0.25rem 0 0 1rem; padding: 0; }

/* SIDE workshop */
.side-organizers { color: var(--muted); }
.session-date { font-weight: 600; }

/* Footer */
footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding: 1rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Print */
@media print {
  body { max-width: none; color: #000; background: #fff; }
  header, footer, nav { display: none; }
  a { color: #000; text-decoration: underline; }
}