:root {
  --accent: #10553f;
  --accent-soft: #e8f1ed;
  --ink: #1a1a18;
  --ink-2: #4a4a45;
  --ink-3: #75756e;
  --rule: #e2e2dc;
  --rule-strong: #c9c9c1;
  --page: #ffffff;
  --panel: #f7f7f4;
  --maxw: 760px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    "Apple SD Gothic Neo", "Malgun Gothic", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- header ---------- */

.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--page);
}

.head-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 24px;
}

.brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand span { color: var(--accent); }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-left: auto;
}

.nav a {
  font-size: 14px;
  color: var(--ink-2);
  padding-bottom: 2px;
}
.nav a:hover { color: var(--ink); text-decoration: none; }
.nav a.on {
  color: var(--ink);
  border-bottom: 2px solid var(--accent);
}

/* ---------- layout ---------- */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 24px 72px;
}

h1 {
  font-size: 30px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

h2 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 44px 0 12px;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 32px 0 8px;
}

p { margin: 0 0 16px; }

.lede {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 32px;
}

.sub {
  font-size: 15px;
  color: var(--ink-3);
  margin: 0 0 28px;
}

.rule { border: 0; border-top: 1px solid var(--rule); margin: 40px 0; }

.muted { color: var(--ink-3); }
.small { font-size: 14px; }

/* ---------- hero ---------- */

.hero { margin-bottom: 8px; }

.mission {
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink);
  border-left: 3px solid var(--accent);
  padding: 2px 0 2px 18px;
  margin: 0 0 32px;
}

.pi-row {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.pi-photo {
  width: 190px;
  height: 242px;
  border-radius: 6px;
  background: var(--panel);
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--ink-3);
  text-align: center;
  padding: 10px;
  flex: none;
  object-fit: cover;
}

.pi-body { flex: 1 1 320px; min-width: 0; }

/* ---------- fact list (education, appointments) ---------- */

dl.facts { margin: 14px 0 0; }
dl.facts dt {
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 14px 0 3px;
}
dl.facts dt:first-child { margin-top: 0; }
dl.facts dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-2);
  padding: 2px 0;
}
dl.facts dd .yr {
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
dl.facts dd b { color: var(--ink); font-weight: 600; }

/* ---------- cards ---------- */

.cards { display: flex; flex-direction: column; gap: 14px; }

.card {
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 18px 20px;
  background: var(--page);
}

.card h3 { margin: 0 0 8px; font-size: 17px; }
.card h3 a { color: var(--ink); }
.card p { font-size: 15px; color: var(--ink-2); margin: 0 0 10px; }
.card .more { font-size: 14px; }

/* ---------- metrics ---------- */

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 0 0 20px;
}

.metric {
  background: var(--panel);
  border-radius: 8px;
  padding: 14px 16px;
}
.metric .label { font-size: 13px; color: var(--ink-3); margin: 0 0 2px; }
.metric .value { font-size: 26px; font-weight: 600; margin: 0; letter-spacing: -0.02em; }

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 36px; }

.btn {
  display: inline-block;
  font-size: 14px;
  border: 1px solid var(--rule-strong);
  border-radius: 7px;
  padding: 7px 13px;
  color: var(--ink);
}
.btn:hover { background: var(--panel); text-decoration: none; }

/* ---------- year chart ---------- */

.chart-label { font-size: 13px; color: var(--ink-3); margin: 0 0 8px; }

.chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 92px;
  margin-bottom: 6px;
}
.chart .col { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; height: 100%; }
.chart .bar { background: var(--accent); opacity: 0.75; border-radius: 3px 3px 0 0; min-height: 3px; }
.chart .col:last-child .bar { opacity: 1; }

.chart-x { display: flex; gap: 8px; margin-bottom: 40px; }
.chart-x span { flex: 1; text-align: center; font-size: 11px; color: var(--ink-3); }

/* ---------- publications ---------- */

.year-head {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 4px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}

ol.pubs { list-style: none; margin: 0; padding: 0; }

ol.pubs li {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink-2);
  padding: 13px 0;
  border-bottom: 1px solid var(--rule);
}
ol.pubs li:last-child { border-bottom: 0; }

.pubs .t { color: var(--ink); }
.pubs .j { font-style: italic; }
.pubs b { color: var(--ink); font-weight: 600; }

.tag {
  display: inline-block;
  font-size: 11.5px;
  line-height: 1.5;
  border-radius: 4px;
  padding: 1px 7px;
  margin-left: 5px;
  white-space: nowrap;
  vertical-align: 1px;
}
.tag.first { background: var(--accent-soft); color: #0b3d2c; }
.tag.corr { background: #f0ecdf; color: #5a4a1c; }

/* ---------- key papers ---------- */

ul.keypapers { list-style: none; margin: 14px 0 0; padding: 0; }
ul.keypapers li {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-2);
  padding: 9px 0 9px 15px;
  border-left: 2px solid var(--rule);
}
ul.keypapers li em { color: var(--ink); font-style: italic; }

/* ---------- data panel ---------- */

.panel {
  background: var(--panel);
  border-radius: 10px;
  padding: 20px 22px;
  margin: 36px 0 0;
}
.panel h3 { margin: 0 0 4px; font-size: 16px; }
.panel p { font-size: 14.5px; color: var(--ink-2); margin: 0 0 12px; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 12.5px;
  background: var(--page);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 3px 9px;
  color: var(--ink-2);
}

/* ---------- definition rows ---------- */

dl.info { margin: 0; }
dl.info div {
  display: flex;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
}
dl.info dt { flex: 0 0 116px; color: var(--ink-3); margin: 0; }
dl.info dd { margin: 0; flex: 1; min-width: 0; }

/* ---------- placeholder ---------- */

.placeholder {
  border: 1px dashed var(--rule-strong);
  border-radius: 10px;
  padding: 26px 22px;
  text-align: center;
  color: var(--ink-3);
  font-size: 15px;
  background: var(--panel);
}

/* ---------- people ---------- */

.person {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}
.person .avatar {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600; flex: none;
}
.person .name { font-size: 15.5px; font-weight: 600; margin: 0; }
.person .role { font-size: 14px; color: var(--ink-3); margin: 0 0 4px; }
.person .note { font-size: 14px; color: var(--ink-2); margin: 0; }

/* ---------- footer ---------- */

.site-foot {
  border-top: 1px solid var(--rule);
  margin-top: 40px;
}
.foot-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px 24px 40px;
  font-size: 13.5px;
  color: var(--ink-3);
}
.foot-inner p { margin: 0 0 4px; }

/* ---------- responsive ---------- */

@media (max-width: 620px) {
  h1 { font-size: 26px; }
  .lede { font-size: 17px; }
  .mission { font-size: 17px; }
  main { padding: 36px 20px 56px; }
  .head-inner { padding: 16px 20px; }
  .nav { margin-left: 0; gap: 14px; }
  dl.info div { flex-direction: column; gap: 2px; }
  dl.info dt { flex: none; }
  .chart-x span { font-size: 10px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #6cc3a3;
    --accent-soft: #14352a;
    --ink: #edece7;
    --ink-2: #b8b7b0;
    --ink-3: #8c8b84;
    --rule: #2e2e2b;
    --rule-strong: #43433f;
    --page: #171715;
    --panel: #201f1d;
  }
  .brand { color: var(--ink); }
  .tag.first { background: #14352a; color: #9fdcc2; }
  .tag.corr { background: #33301f; color: #dbc98a; }
}

/* ---------- research figure (home) ---------- */

.figure { margin: 4px 0 0; }

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 10px;
}

.pillar {
  border: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
  border-radius: 0 0 8px 8px;
  padding: 15px 16px 16px;
  display: block;
  color: inherit;
  min-width: 0;
}
.pillar:hover { background: var(--panel); text-decoration: none; }

.pillar .n {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  display: block;
  margin-bottom: 5px;
}
.pillar h4 {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 7px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.pillar p {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
}

.base {
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 15px 18px 16px;
}
.base .t {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 3px;
}
.base .d {
  font-size: 13px;
  color: var(--ink-2);
  margin: 0 0 10px;
}
.base .chips .chip { background: var(--page); }

@media (max-width: 620px) {
  .pillars { grid-template-columns: 1fr; }
  .pillar { border-radius: 0 0 8px 8px; }
}

/* ---------- networks ---------- */

ul.networks { list-style: none; margin: 16px 0 0; padding: 0; }

ul.networks li {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--rule);
}
ul.networks li:last-child { border-bottom: 0; }

ul.networks .abbr {
  flex: 0 0 148px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}
ul.networks .body { flex: 1; min-width: 0; }
ul.networks .body .full {
  font-size: 14px;
  color: var(--ink-2);
  margin: 0 0 2px;
  line-height: 1.5;
}
ul.networks .body .meta {
  font-size: 13px;
  color: var(--ink-3);
  margin: 0;
}
ul.networks .role {
  color: var(--accent);
  font-weight: 600;
}

@media (max-width: 620px) {
  ul.networks li { flex-direction: column; gap: 3px; }
  ul.networks .abbr { flex: none; }
}

/* ---------- update stamp ---------- */

.stamp {
  font-size: 13px;
  color: var(--ink-3);
  margin: -24px 0 34px;
}
.stamp::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
  margin-right: 7px;
  vertical-align: 1px;
}

/* ---------- people ---------- */

.person .avatar {
  width: 64px; height: 64px; border-radius: 50%;
  object-fit: cover;
  flex: none;
}
div.avatar {
  background: var(--accent-soft);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600;
  letter-spacing: 0.02em;
}
.person .ko { font-weight: 400; color: var(--ink-3); font-size: 14px; }

ul.alumni { list-style: none; margin: 14px 0 0; padding: 0; }
ul.alumni li {
  font-size: 14.5px;
  color: var(--ink-2);
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
}
ul.alumni li:last-child { border-bottom: 0; }
ul.alumni b { color: var(--ink); font-weight: 600; }
ul.alumni .yr {
  display: inline-block;
  width: 48px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* ---------- people grid ---------- */

h2 .count {
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-3);
  vertical-align: 3px;
  margin-left: 4px;
}

.grouphead {
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 28px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}
.grouphead .n {
  text-transform: none;
  letter-spacing: 0;
  margin-left: 4px;
}

.peoplegrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 20px;
}

.person.compact {
  padding: 10px 0;
  border-bottom: 0;
  gap: 12px;
  align-items: center;
}
.person.compact .avatar { width: 42px; height: 42px; font-size: 13px; }
.person.compact .name { font-size: 15px; }
.person.compact .role { font-size: 13px; margin: 1px 0 0; }
.person.compact .note { font-size: 13px; margin: 2px 0 0; }

div.avatar.ko { font-size: 13px; letter-spacing: -0.02em; }
.person.compact div.avatar.ko { font-size: 12px; }

@media (max-width: 620px) {
  .peoplegrid { grid-template-columns: 1fr; }
}

.person .since {
  font-size: 12.5px;
  font-weight: 400;
  color: var(--ink-3);
  margin-left: 6px;
  white-space: nowrap;
}

.person .star {
  color: var(--accent);
  font-weight: 600;
  margin-left: 1px;
}
.footnote {
  font-size: 13px;
  color: var(--ink-3);
  margin: 20px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}
.footnote .star { color: var(--accent); font-weight: 600; margin-right: 4px; }

/* ---------- training roadmap ---------- */

.roadmap { margin: 18px 0 0; }

.roadmap .stage {
  position: relative;
  padding: 0 0 22px 26px;
  border-left: 2px solid var(--rule);
}
.roadmap .stage:last-child { border-left-color: transparent; padding-bottom: 0; }

.roadmap .stage::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.roadmap .yr {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
  line-height: 1.2;
}
.roadmap .lbl {
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 3px 0 8px;
}
.roadmap ul { margin: 0; padding-left: 18px; }
.roadmap li {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-2);
  margin-bottom: 4px;
}