/* =========================================================
   Top navigation — static white bar, hairline below
========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.8rem var(--gutter);
  max-width: var(--max);
  margin-inline: auto;
}
.nav__brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.nav__brand:hover { color: var(--accent); }
.nav__links {
  display: flex;
  gap: 0.25rem 1.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav__links a {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--ink-3);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1.5px solid transparent;
}
.nav__links a:hover { color: var(--ink); }
.nav__links a.is-active { color: var(--ink); border-bottom-color: var(--accent); }

@media (max-width: 640px) {
  /* On narrow screens the link row wraps to several lines; keep the bar in normal
     flow so it does not eat the viewport or cover anchored section headings. */
  .nav { position: static; }
  .nav__inner { flex-direction: column; align-items: flex-start; gap: 0.4rem; padding-bottom: 0.6rem; }
  .nav__links { justify-content: flex-start; gap: 0.1rem 1rem; }
  .nav__links a { font-size: 0.82rem; }
}

/* =========================================================
   Masthead — portrait + name + affiliation + contacts
========================================================= */
.masthead {
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--rule);
}
.masthead__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}
@media (min-width: 720px) {
  .masthead__grid { grid-template-columns: 200px 1fr; gap: 3rem; }
}
.masthead__portrait {
  width: 200px;
  max-width: 100%;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--rule);
}
.masthead__portrait img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.masthead__affil-line {
  font-family: var(--font-sans);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
}
.masthead__affil-line svg { width: 18px; height: 16px; display: block; }
.masthead__name {
  font-size: var(--fs-name);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin-bottom: 0.9rem;
}
.masthead__role {
  font-size: 1.2rem;
  color: var(--ink);
  margin-bottom: 0.35rem;
}
.masthead__affil {
  color: var(--ink-2);
  line-height: 1.55;
  margin-bottom: 1.5rem;
}
.masthead__affil span { display: block; }

.masthead__contacts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule);
  max-width: 560px;
}
.contact {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--ink-2);
  text-decoration: none;
}
.contact svg { width: 15px; height: 15px; color: var(--ink-3); flex-shrink: 0; }
.contact:hover { color: var(--accent); }
.contact:hover svg { color: var(--accent); }
.contact__label { color: var(--ink-3); }

/* =========================================================
   About
========================================================= */
.about__bio { max-width: var(--measure); }
.about__bio p { margin-bottom: 1.1rem; }
.about__bio p:last-child { margin-bottom: 0; }

.metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin-top: 2rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  max-width: 640px;
}
@media (min-width: 560px) { .metrics { grid-template-columns: repeat(4, 1fr); } }
.metric {
  padding: 1rem 1.25rem 1rem 0;
}
.metric + .metric { border-left: 1px solid var(--rule); padding-left: 1.25rem; }
@media (max-width: 559px) {
  .metric:nth-child(3) { border-left: none; padding-left: 0; }
  .metric:nth-child(n+3) { border-top: 1px solid var(--rule); }
}
.metric__value {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.metric__label {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--font-sans);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* =========================================================
   Research interests — numbered two-column list
========================================================= */
.interest-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 3rem;
  counter-reset: interest;
}
@media (min-width: 720px) { .interest-list { grid-template-columns: 1fr 1fr; } }
.interest-item {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: 0.75rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
}
.interest-item__num {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  font-weight: 600;
  color: var(--accent);
  padding-top: 0.3rem;
  font-variant-numeric: tabular-nums;
}
.interest-item__label {
  font-weight: 600;
  color: var(--ink);
  font-size: 1.05rem;
}
.interest-item__brief {
  color: var(--ink-3);
  font-size: var(--fs-small);
  margin-top: 0.15rem;
  line-height: 1.5;
}

/* =========================================================
   Education & experience — year gutter list
========================================================= */
.col-head {
  font-family: var(--font-sans);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 0.5rem;
  margin-bottom: 0.25rem;
  border-bottom: 1px solid var(--rule);
}
.entry-list { display: grid; }
.entry {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
}
.entry__year {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  font-weight: 500;
  color: var(--ink-3);
  padding-top: 0.25rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.entry__title { font-weight: 600; color: var(--ink); }
.entry__sub { color: var(--ink-3); font-size: var(--fs-small); margin-top: 0.1rem; }

/* =========================================================
   Publications
========================================================= */
.pub-controls {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1.25rem;
}
.pub-search, .pub-filter {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.5rem 0.75rem;
  transition: border-color var(--dur) var(--ease);
}
.pub-search { flex: 1 1 240px; }
.pub-search::placeholder { color: var(--ink-4); }
.pub-search:focus, .pub-filter:focus { outline: none; border-color: var(--ink); }
.pub-filter { cursor: pointer; }
.pub-count {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--ink-3);
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}

.pub-list {
  display: grid;
  border-top: 1px solid var(--rule);
}
.pub-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.pub-item__year {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  font-weight: 500;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.pub-item__main { min-width: 0; }
.pub-item__title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
  margin: 0 0 0.2rem;
}
.pub-item__meta {
  font-size: var(--fs-small);
  color: var(--ink-3);
  line-height: 1.5;
}
.pub-item__venue { font-style: italic; }
.pub-item__cites {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--ink-3);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.pub-item__cites strong { color: var(--ink); font-weight: 600; }
@media (max-width: 560px) {
  .pub-item { grid-template-columns: 3rem 1fr; }
  .pub-item__cites { grid-column: 2; }
}

.pub-empty { padding: 2.5rem 0; color: var(--ink-3); text-align: center; }

.pub-more {
  margin-top: 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--ink);
  border-radius: 3px;
  padding: 0.5rem 1.1rem;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.pub-more:hover { background: var(--ink); color: #fff; }
.pub-more[hidden] { display: none; }

.pub-note {
  margin-top: 1.25rem;
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--ink-4);
}

/* =========================================================
   Courses & awards
========================================================= */
.course {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
}
.course__code {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.course__title { font-weight: 600; color: var(--ink); margin: 0.1rem 0; }
.course__sem { font-size: var(--fs-small); color: var(--ink-3); }

.award {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.award__year {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  font-weight: 500;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.award__title { color: var(--ink-2); font-size: var(--fs-small); line-height: 1.5; }

/* =========================================================
   Highlighted project — panel with scarlet left rule
========================================================= */
.project {
  background: var(--bg-panel);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 1.75rem 2rem;
  max-width: 820px;
}
.project__badge {
  font-family: var(--font-sans);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.6rem;
}
.project__title {
  font-size: clamp(1.2rem, 2vw, 1.4rem);
  line-height: 1.35;
  margin-bottom: 0.8rem;
}
.project__body { color: var(--ink-2); margin: 0; }
@media (max-width: 560px) { .project { padding: 1.25rem 1.25rem; } }

/* =========================================================
   Service / memberships — grouped lists
========================================================= */
.svc-group { margin-bottom: 1.6rem; }
.svc-group:last-child { margin-bottom: 0; }
.svc-group__label {
  font-family: var(--font-sans);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
}
.svc-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}
.svc-group li {
  position: relative;
  padding-left: 1rem;
  font-size: var(--fs-small);
  line-height: 1.5;
  color: var(--ink-2);
}
.svc-group li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--ink-4);
}

/* =========================================================
   Students
========================================================= */
.student-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 3rem;
  border-top: 1px solid var(--rule);
  max-width: 820px;
}
@media (min-width: 640px) { .student-list { grid-template-columns: 1fr 1fr; } }
.student {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.25rem 1rem;
  align-items: baseline;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--rule);
}
.student__name { font-weight: 600; color: var(--ink); }
.student__year {
  grid-column: 1;
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--ink-3);
}
.student__link {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  font-weight: 500;
  color: var(--ink-3);
  text-decoration: none;
  white-space: nowrap;
}
.student__link:hover { color: var(--accent); }

/* =========================================================
   Footer
========================================================= */
.footer {
  margin-top: var(--section-gap);
  padding: 1.75rem var(--gutter) 2.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--ink-3);
}
.footer__inner {
  max-width: var(--max);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
}
.footer p { margin: 0; }
.footer a { color: var(--ink-3); text-decoration-color: var(--rule-strong); }
.footer a:hover { color: var(--accent); }