@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&display=swap');

/* Purple palette carried over from the original Hyperspace theme */
:root {
  --purple-deep: #312450;   /* old sidebar */
  --purple-dark: #541887;   /* old heading color */
  --purple: #5e42a6;        /* old gradient start */
  --pink: #b74e91;          /* old gradient end */
  --purple-light: #ece6f6;
  --lavender: #f6f2fb;
  --cream: #fdfcff;
  --text: #24212b;
  --muted: #5d586a;
  --border: #e2dcec;
  --max-width: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "DM Sans", Arial, sans-serif;
  color: var(--text);
  background: var(--cream);
  font-size: 17px;
  line-height: 1.45;
}

.top-bar {
  height: 8px;
  background: linear-gradient(90deg, var(--purple-deep), var(--purple) 55%, var(--pink));
}

.site-header {
  background: var(--cream);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 68px;
  padding: 0 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-name {
  color: var(--purple-dark);
  text-decoration: none;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .03em;
}

.nav-links { display: flex; gap: 8px; }

.tab-button {
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 10px 18px;
  border-radius: 7px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.tab-button:hover { background: var(--purple-light); }
.tab-button.active { background: var(--purple-deep); color: #fff; }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 42px 30px 65px;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Profile */
.intro {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 52px;
  align-items: start;
  margin-bottom: 58px;
}

.profile-photo {
  width: 260px;
  height: 325px;
  object-fit: cover;
  border-radius: 2px;
  box-shadow: 10px 10px 0 var(--purple-light);
}

.intro-text { max-width: 760px; }

h1 {
  margin: 0 0 12px;
  color: var(--purple-dark);
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -.02em;
}

.position { margin: 0 0 21px; font-size: 20px; line-height: 1.3; }
.links { margin: 0 0 22px; }

a {
  color: var(--purple);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: var(--pink); }

/* Research */
.research h2,
.page-section > h2 {
  color: var(--purple-dark);
  font-size: 28px;
  margin: 0 0 22px;
  line-height: 1.2;
}

.paper { margin-bottom: 34px; }

.paper h3 {
  font-size: 18px;
  line-height: 1.28;
  margin: 0 0 2px;
  font-weight: 700;
}
.paper h3 a { color: var(--text); text-decoration: none; }
.paper h3 a:hover { color: var(--purple-dark); text-decoration: underline; }

.paper p { margin: 0; }
.paper p a { color: var(--text); text-decoration: none; }
.paper p a:hover { color: var(--purple-dark); }

.citation { font-style: italic; }
.paper p.citation a { color: var(--purple); font-style: italic; }
.paper p.citation a:hover { color: var(--pink); }

.paper-title-row {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: 5px;
  align-items: start;
}
.paper-title-row + p,
.paper-title-row ~ p { margin-left: 27px; }

.abstract-toggle {
  border: 0;
  background: transparent;
  color: var(--purple-dark);
  width: 22px;
  height: 25px;
  padding: 0;
  cursor: pointer;
  font-size: 27px;
  line-height: 21px;
}
.arrow { display: inline-block; transition: transform .18s ease; }
.abstract-toggle[aria-expanded="true"] .arrow { transform: rotate(90deg); }

.abstract {
  margin: 10px 0 0 27px;
  padding: 11px 15px;
  border-left: 3px solid var(--pink);
  background: var(--lavender);
  color: #39343f;
  font-size: 15.5px;
  line-height: 1.5;
}
.abstract p { margin: 0; }
.abstract strong { color: var(--purple-dark); }

/* Teaching */
.page-section { max-width: 850px; }
.page-section > h3 {
  color: var(--purple-dark);
  margin-top: 38px;
  font-size: 23px;
}

.course {
  border-left: 5px solid var(--pink);
  background: white;
  padding: 15px 20px;
  margin: 18px 0;
  box-shadow: 0 2px 10px rgba(49, 36, 80, .07);
}
.course.ta { border-left-color: var(--purple); }

.course h4 { color: var(--purple-dark); font-size: 19px; margin: 0 0 5px; }
.course p { margin: 0; }
.course .meta { color: var(--muted); }
.course ul { margin: 6px 0 0; padding-left: 20px; }

footer {
  border-top: 1px solid var(--border);
  padding: 22px 30px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .nav { padding: 15px 20px; flex-direction: column; align-items: flex-start; gap: 11px; }
  .nav-links { width: 100%; }
  .tab-button { flex: 1; }
  main { padding: 32px 20px 50px; }
  .intro { grid-template-columns: 1fr; gap: 28px; margin-bottom: 48px; }
  .profile-photo { width: min(100%, 260px); }
  h1 { font-size: 30px; }
  .position { font-size: 18px; }
  .research h2, .page-section > h2 { font-size: 25px; }
}

/* Co-authors sit on the title line, in regular weight */
.paper h3 .coauthors { font-weight: 400; }
.paper h3 .coauthors a { font-weight: 400; }

.paper p.citation a.pdf-link { font-style: normal; font-weight: 600; text-decoration: none; }
.paper p.citation a.pdf-link:hover { text-decoration: underline; }