:root {
  --ink: #1b2430;
  --ink-soft: #4a5568;
  --paper: #fbfaf8;
  --paper-raised: #ffffff;
  --line: #e4e1da;
  --accent: #8a3b2e;
  --accent-soft: #f4ece7;
  --max-width: 780px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
}

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / Nav ---------- */
header.site-header {
  border-bottom: 1px solid var(--line);
  padding: 28px 0 20px;
}

.site-header .wrap {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
}

.site-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.site-title:hover { text-decoration: none; }

nav.site-nav a {
  color: var(--ink-soft);
  margin-left: 20px;
  font-size: 0.95rem;
  font-weight: 500;
}

nav.site-nav a:first-child { margin-left: 0; }

nav.site-nav a.active,
nav.site-nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 48px 0 8px;
}

.hero h1 {
  font-size: 2.1rem;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}

.hero .role {
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin-bottom: 18px;
}

.hero p.lede {
  font-size: 1.05rem;
  color: var(--ink);
  max-width: 68ch;
}

.links-row {
  margin: 18px 0 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 0.95rem;
}

/* ---------- Stat cards ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin: 34px 0;
}

.stat {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
}

.stat .num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
  line-height: 1.2;
}

.stat .label {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ---------- Sections ---------- */
section.block {
  margin: 44px 0;
}

section.block h2 {
  font-size: 1.3rem;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}

section.block .section-sub {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin-bottom: 20px;
}

/* ---------- Cards (projects/publications) ---------- */
.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 16px;
}

.card h3 {
  margin: 0 0 4px;
  font-size: 1.08rem;
}

.card .meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.card p { margin: 0 0 8px; }
.card p:last-child { margin-bottom: 0; }

.tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  margin: 0 6px 6px 0;
}

/* ---------- Timeline ---------- */
.timeline-item {
  border-left: 2px solid var(--line);
  padding-left: 20px;
  margin-bottom: 26px;
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline-item h3 {
  margin: 0 0 2px;
  font-size: 1.05rem;
}

.timeline-item .meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

/* ---------- Lists ---------- */
ul.plain, ol.plain {
  padding-left: 1.2em;
  margin: 0 0 8px;
}

ul.plain li, ol.plain li { margin-bottom: 6px; }

/* ---------- Details / collapsible ---------- */
details.legacy {
  margin-top: 8px;
  border-top: 1px dashed var(--line);
  padding-top: 14px;
}

details.legacy summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

details.legacy .card { margin-top: 14px; }

/* ---------- Footer ---------- */
footer.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 60px;
  padding: 24px 0 60px;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

@media (max-width: 560px) {
  .hero h1 { font-size: 1.7rem; }
  nav.site-nav a { margin-left: 14px; font-size: 0.88rem; }
}