/* ===========================================================================
   Julian Terstegge — personal academic website
   Minimal single-column layout (inspired by fuzhiyu.me)
   =========================================================================== */

:root {
  --ink:    #1c1c1c;   /* body text            */
  --navy:   #00274c;   /* Michigan navy — name & headings */
  --link:   #11539e;   /* links                */
  --link-h: #00274c;   /* link hover           */
  --muted:  #6f6f6f;   /* secondary text       */
  --rule:   #e7e7e7;   /* hairline rules       */
  --maize:  #ffcb05;   /* Michigan maize accent */
  --maxw:   760px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0 auto;
  max-width: var(--maxw);
  padding: 2.2rem 1.25rem 4rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
               Arial, "Helvetica Neue", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease, color .15s ease;
}
a:hover { color: var(--link-h); border-bottom-color: currentColor; }

/* ---- Site header / navigation ------------------------------------------- */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .4rem 1rem;
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--navy);
}
.site-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: .2px;
  color: var(--navy);
  border-bottom: none;
}
.site-title:hover { color: var(--navy); border-bottom: none; }

.site-nav { display: flex; gap: 1.4rem; font-size: 1.02rem; }
.site-nav a { color: var(--muted); border-bottom: none; padding-bottom: 2px; }
.site-nav a:hover { color: var(--navy); border-bottom: none; }
.site-nav a.active {
  color: var(--navy);
  font-weight: 600;
  border-bottom: 2px solid var(--maize);
}

/* ---- Home: profile block ------------------------------------------------ */
.profile {
  display: flex;
  gap: 1.8rem;
  align-items: flex-start;
  margin-bottom: 2.2rem;
}
.profile img {
  width: 190px;
  border-radius: 6px;
  flex-shrink: 0;
}
.profile h1 {
  margin: .1rem 0 .15rem;
  font-size: 1.9rem;
  color: var(--navy);
  line-height: 1.15;
}
.profile .subtitle { margin: 0; color: var(--ink); font-weight: 600; }
.profile .affil { margin: .1rem 0 .9rem; color: var(--muted); }
.profile p.bio { margin: .6rem 0 0; }

/* inline quick-links row */
.quicklinks {
  margin-top: 1rem;
  font-size: .97rem;
  line-height: 1.9;
}
.quicklinks a { white-space: nowrap; }
.quicklinks .sep { color: var(--rule); margin: 0 .55rem; }

/* ---- Section headings --------------------------------------------------- */
section { margin-top: 2.6rem; }
h2 {
  font-size: 1.18rem;
  color: var(--navy);
  margin: 0 0 1rem;
  padding-bottom: .35rem;
  border-bottom: 1px solid var(--rule);
}

/* ---- Publication list --------------------------------------------------- */
.pub-list { list-style: none; margin: 0; padding: 0; }
.pub-list > li { margin-bottom: 1.5rem; }
.pub-title { font-weight: 600; color: var(--ink); }
.pub-meta  { color: var(--muted); font-size: .96rem; }
.pub-meta em { font-style: italic; }
.pub-links { font-size: .92rem; margin-top: .15rem; }
.pub-links a { white-space: nowrap; }
.pub-links .sep { color: var(--rule); margin: 0 .5rem; }

/* Abstract toggle — styled to match the .pub-links links */
.abstract-toggle {
  font: inherit;
  color: var(--link);
  background: none;
  border: 0;
  border-bottom: 1px solid transparent;
  padding: 0;
  cursor: pointer;
  vertical-align: baseline;
  white-space: nowrap;
}
.abstract-toggle:hover { color: var(--link-h); border-bottom-color: currentColor; }

/* Collapsible abstract panel */
.abstract {
  display: none;
  margin-top: .6rem;
  padding: .65rem .85rem;
  background: #f6f7f9;
  border-left: 3px solid var(--navy);
  border-radius: 0 4px 4px 0;
  font-size: .95rem;
  line-height: 1.62;
  color: var(--ink);
  max-width: 64ch;
}
.abstract.open { display: block; }
.abstract p { margin: 0; }

/* ---- Discussions list --------------------------------------------------- */
.discussion-intro { color: var(--muted); margin: -.4rem 0 1.8rem; }
.discussion-list {
  list-style: none;
  counter-reset: disc;
  margin: 0;
  padding: 0;
}
.discussion-list > li {
  position: relative;
  counter-increment: disc;
  padding-left: 2.4rem;
  margin-bottom: 1.7rem;
}
.discussion-list > li::before {
  content: counter(disc) ".";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}
.disc-paper   { font-weight: 600; color: var(--ink); }
.disc-authors { color: var(--ink); }
.disc-venue   { color: var(--muted); font-style: italic; }
.disc-links   { margin-top: .15rem; font-size: .95rem; }

/* ---- Footer ------------------------------------------------------------- */
.site-footer {
  margin-top: 3.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: .88rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .4rem;
}

/* ---- Responsive --------------------------------------------------------- */
@media (max-width: 560px) {
  body { font-size: 16px; padding-top: 1.6rem; }
  .profile { flex-direction: column; align-items: center; text-align: center; }
  .profile img { width: 150px; }
  .quicklinks { text-align: center; }
  .site-header { justify-content: center; text-align: center; }
}