/* Design tokens. Change --accent and the whole site follows. */
:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5f6672;
  --faint: #8b919c;
  --rule: #e6e8ec;
  --accent: #2f5d8f;
  --accent-soft: #eef3f9;
  --banner-bg: #fdf6e3;
  --banner-fg: #7a5c14;
  --banner-rule: #ecd9a6;
  --measure: 44rem;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e4e6ea;
    --muted: #a2a9b5;
    --faint: #7c838f;
    --rule: #272b32;
    --accent: #86b3e0;
    --accent-soft: #1b2430;
    --banner-bg: #241f13;
    --banner-fg: #d9c184;
    --banner-rule: #3d3524;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 10;
  background: var(--bg);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover { border-bottom-color: currentColor; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---- Banner ---- */
.banner {
  background: var(--banner-bg);
  color: var(--banner-fg);
  border-bottom: 1px solid var(--banner-rule);
  font-size: 0.86rem;
  letter-spacing: 0.01em;
  text-align: center;
  padding: 0.55rem 1.25rem;
}

/* ---- Shell ---- */
.site-header,
main,
.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 2.5rem;
  padding-bottom: 1.5rem;
}

.site-title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.site-title:hover { border-bottom-color: var(--rule); }

.site-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.94rem;
}
.site-nav a { color: var(--muted); }
.site-nav a[aria-current="page"] {
  color: var(--fg);
  border-bottom-color: var(--accent);
}

main { padding-bottom: 4rem; }

/* ---- Typography ---- */
h1, h2, h3 {
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 600;
}
h1 {
  font-size: 1.9rem;
  margin: 1rem 0 0.5rem;
}
h2 {
  font-size: 1.2rem;
  margin: 2.75rem 0 0.9rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
}
h3 {
  font-size: 1.02rem;
  margin: 1.75rem 0 0.5rem;
}
p { margin: 0 0 1.1rem; }

.lede {
  font-size: 1.08rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.intro {
  font-size: 1.12rem;
  line-height: 1.6;
}

.namenote {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: -0.4rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ---- Publication + patent lists ---- */
.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.pub-list li {
  margin: 0 0 1.4rem;
}
.pub-title {
  display: block;
  font-weight: 550;
  color: var(--fg);
  line-height: 1.4;
}
.pub-authors {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.15rem;
}
.pub-authors .me {
  color: var(--fg);
  font-weight: 600;
}
.pub-meta {
  display: block;
  font-size: 0.86rem;
  color: var(--faint);
  margin-top: 0.2rem;
}
.pub-meta .venue { color: var(--muted); }
.pub-meta a { font-size: 0.86rem; }
.sep { padding: 0 0.4rem; color: var(--rule); }

.year-group {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0 1rem;
  margin-top: 1.4rem;
}
/* The list already ends in a paragraph gap; don't stack another one on top. */
.year-group .pub-list li:last-child { margin-bottom: 0.5rem; }
.year-label {
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  color: var(--faint);
  padding-top: 0.2rem;
  position: sticky;
  top: 1rem;
  align-self: start;
}

@media (max-width: 34rem) {
  .year-group {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .year-label {
    position: static;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 0.25rem;
  }
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--accent-soft);
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  vertical-align: 0.08em;
  margin-left: 0.35rem;
}

.patent-numbers {
  display: block;
  font-size: 0.86rem;
  color: var(--faint);
  margin-top: 0.2rem;
  font-variant-numeric: tabular-nums;
}
.patent-numbers .num { color: var(--muted); }
.patent-numbers a.num { color: var(--accent); }
.patent-numbers a.pdf {
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  vertical-align: 0.06em;
}

.summary {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0.25rem 0 1.5rem;
}

/* ---- Research themes ---- */
.theme-span {
  display: block;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--faint);
  margin: -0.5rem 0 0.9rem;
}

.theme-items {
  margin: 1.25rem 0 0;
  border-top: 1px solid var(--rule);
  padding-top: 0.75rem;
}
.theme-items > summary {
  cursor: pointer;
  font-size: 0.86rem;
  color: var(--accent);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.theme-items > summary::-webkit-details-marker { display: none; }
.theme-items > summary::before {
  content: "▸";
  font-size: 0.7em;
  transition: transform 0.15s ease;
}
.theme-items[open] > summary::before { transform: rotate(90deg); }
.theme-items > summary:hover { text-decoration: underline; }
.theme-items > summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
.theme-items .pub-list { margin-top: 1rem; }

/* ---- CV / service lists ---- */
.cv-list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}
.cv-list li { margin: 0 0 1.1rem; }
.cv-list.plain li { margin-bottom: 0.7rem; }

.cv-what {
  display: block;
  font-weight: 550;
  color: var(--fg);
  line-height: 1.4;
}
.cv-where {
  display: block;
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: 0.1rem;
}
.cv-note {
  display: block;
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 0.3rem;
}

h3 + .cv-list { margin-top: 0.75rem; }

.tag.award {
  color: var(--accent);
  background: var(--accent-soft);
}

.items-subhead {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding-top: 1.5rem;
  padding-bottom: 3rem;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}
.colophon {
  font-size: 0.82rem;
  color: var(--faint);
  margin: 0;
}