/* ---------- Tokens ---------- */
:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --fg: #1c1f24;
  --muted: #5d6673;
  --border: #e5e7eb;
  --accent: #2b59c3;
  --accent-soft: #e8eefb;
  --header-bg: rgba(255, 255, 255, 0.82);
  --radius: 10px;
  --maxw: 760px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --surface: #171a20;
    --fg: #e6e8eb;
    --muted: #9aa3ae;
    --border: #262a31;
    --accent: #7ea2ff;
    --accent-soft: #1b2440;
    --header-bg: rgba(15, 17, 21, 0.82);
    color-scheme: dark;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
}
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
  flex-wrap: wrap;
}

.brand {
  color: var(--fg);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }

.site-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.925rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 6px;
}
.site-nav a:hover { color: var(--fg); background: var(--surface); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--fg); }

/* ---------- Hero (home) ---------- */
.hero {
  display: flex;
  align-items: center;
  gap: 36px;
  padding: 56px 0 24px;
}

.hero-photo {
  width: 176px;
  height: 176px;
  flex-shrink: 0;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.hero h1 {
  margin: 0;
  font-size: 2.1rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
  font-weight: 700;
}

.hero-role {
  margin: 6px 0 0;
  font-size: 1.1rem;
  color: var(--fg);
}

.hero-affil {
  margin: 2px 0 0;
  color: var(--muted);
}

.hero .social { margin-top: 18px; }

.hero .social a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.hero .social a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ---------- Social list ---------- */
.social {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.social a { color: var(--muted); }
.social a:hover { color: var(--accent); text-decoration: none; }

/* ---------- Page header ---------- */
.page-header {
  padding: 56px 0 8px;
}
.page-header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: -0.025em;
  line-height: 1.2;
}
.page-subtitle, .page-meta {
  margin: 8px 0 0;
  color: var(--muted);
}

/* ---------- Prose ---------- */
.prose { padding-bottom: 8px; }

.prose h1,
.prose h2 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 48px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.prose h3 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin: 32px 0 2px;
}

.prose h3 + p {
  margin-top: 0;
  color: var(--muted);
  font-size: 0.925rem;
}

.prose p { margin: 0 0 16px; }

.prose ul { padding-left: 1.2em; margin: 8px 0 16px; }
.prose li { margin: 4px 0; }
.prose li::marker { color: var(--muted); }

.prose strong { font-weight: 600; }

.prose hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }

.more { margin-top: 16px; font-weight: 500; }

/* ---------- Publications ---------- */
.pubs {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.pub:last-child { border-bottom: 0; }

.pub-venue {
  align-self: start;
  justify-self: start;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 6px;
  color: var(--accent);
  background: var(--accent-soft);
  white-space: nowrap;
}
.pub-venue.is-preprint { color: var(--muted); background: var(--surface); }

.pub-title {
  color: var(--fg);
  font-weight: 600;
  line-height: 1.45;
}
.pub-title:hover { color: var(--accent); }

.pub-authors, .pub-note {
  margin-top: 4px;
  font-size: 0.9rem;
  color: var(--muted);
}
.pub-authors strong { color: var(--fg); font-weight: 600; }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 72px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  padding-bottom: 32px;
}
.site-footer .social { gap: 14px; font-size: 1.05rem; }

/* ---------- 404 ---------- */
.not-found { text-align: center; padding: 72px 0 0; }
.not-found h1 { font-size: 2rem; letter-spacing: -0.02em; margin: 0 0 8px; }
.not-found p { color: var(--muted); }

/* ---------- Small screens ---------- */
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .header-inner { padding-top: 10px; padding-bottom: 10px; }
  .site-nav { margin-left: -8px; gap: 0; }
  .site-nav a { padding: 4px 8px; font-size: 0.875rem; }
  .hero { flex-direction: column; align-items: flex-start; gap: 20px; padding-top: 36px; }
  .hero-photo { width: 120px; height: 120px; }
  .hero h1 { font-size: 1.75rem; }
  .page-header { padding-top: 36px; }
  .pub { grid-template-columns: 1fr; gap: 8px; }
  .footer-inner { flex-direction: column-reverse; align-items: flex-start; }
}