:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1c2226;
  --muted: #5d676d;
  --faint: #8a9399;
  --rule: #e4e1da;
  --accent: #1f5a6b;
  --accent-soft: #e6eff1;
  --badge: #8a4b12;
  --badge-soft: #f6ece1;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181b;
    --surface: #1b2024;
    --text: #e6e8e9;
    --muted: #a3acb1;
    --faint: #7b858b;
    --rule: #2c3337;
    --accent: #7fc0d0;
    --accent-soft: #1e3138;
    --badge: #e0a86f;
    --badge-soft: #33271c;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}

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

.wrap { max-width: 780px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; padding-top: 22px; padding-bottom: 18px;
}
.site-name {
  font-family: var(--serif); font-size: 22px; font-weight: 600;
  color: var(--text); letter-spacing: -0.01em;
}
.site-name:hover { text-decoration: none; }
nav { display: flex; gap: 22px; flex-wrap: wrap; }
nav a { color: var(--muted); font-size: 15px; }
nav a:hover { color: var(--text); text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

main { padding: 48px 0 64px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 6px; }
h2 {
  font-size: 13px; font-family: var(--sans); text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); font-weight: 600;
  margin: 52px 0 18px; padding-bottom: 8px; border-bottom: 1px solid var(--rule);
}
h2:first-child { margin-top: 0; }

/* Home */
.intro { display: grid; grid-template-columns: 1fr 200px; gap: 40px; align-items: start; }
.intro img {
  width: 200px; height: 240px; object-fit: cover; border-radius: 4px;
  filter: grayscale(100%); background: var(--rule);
}
.lede { font-size: 18px; color: var(--muted); margin: 0 0 28px; }
.roles { list-style: none; padding: 0; margin: 0 0 28px; }
.roles li { padding: 7px 0; border-top: 1px solid var(--rule); display: grid; grid-template-columns: 150px 1fr; gap: 12px; }
.roles li:last-child { border-bottom: 1px solid var(--rule); }
.roles .role { color: var(--muted); font-size: 14px; padding-top: 1px; }
.roles + .previously { margin: -14px 0 28px; font-size: 14px; color: var(--muted); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }.btn {
  display: inline-block; padding: 8px 16px; border-radius: 4px; font-size: 14px;
  font-weight: 500; border: 1px solid var(--accent);
}
.btn.primary { background: var(--accent); color: var(--bg); }
.btn:hover { text-decoration: none; opacity: 0.88; }

/* Papers */
.paper { margin: 0 0 26px; }
.paper .title { font-family: var(--serif); font-size: 18px; font-weight: 600; line-height: 1.35; }
.paper .title a { color: var(--text); }
.paper .title a:hover { color: var(--accent); }
.paper .authors { color: var(--muted); font-size: 15px; }
.paper .venue { font-style: italic; font-size: 15px; }
.paper .year { color: var(--faint); font-weight: 400; font-family: var(--sans); font-size: 15px; }
.links { margin-top: 4px; font-size: 14px; }
.links a + a::before { content: "·"; color: var(--faint); margin: 0 8px; display: inline-block; }
.badge {
  display: inline-block; font-family: var(--sans); font-size: 12px; font-weight: 600;
  padding: 1px 8px; border-radius: 10px; margin-left: 6px; vertical-align: 2px;
  background: var(--badge-soft); color: var(--badge); letter-spacing: 0.02em;
}
.badge.neutral { background: var(--accent-soft); color: var(--accent); }

/* Software */
.project { display: grid; grid-template-columns: 1fr 220px; gap: 32px; margin-bottom: 12px; }
.project img { width: 100%; border: 1px solid var(--rule); border-radius: 4px; background: var(--surface); }
.project h3 { font-size: 24px; margin: 0 0 4px; }
.project .sub { color: var(--muted); margin: 0 0 14px; }
.project p { margin: 0 0 12px; }
.note { font-size: 14px; color: var(--muted); }

footer { border-top: 1px solid var(--rule); padding: 22px 0 40px; font-size: 12px; color: var(--faint); }

@media (max-width: 640px) {
  main { padding-top: 32px; }
  h1 { font-size: 28px; }
  .intro { grid-template-columns: 1fr; gap: 24px; }
  .intro img { order: -1; width: 140px; height: 168px; }
  .roles li { grid-template-columns: 1fr; gap: 0; }
  .project { grid-template-columns: 1fr; gap: 16px; }
  .project img { max-width: 320px; }
}