:root {
  --bg: #f6f4ef;
  --ink: #1a1a1a;
  --muted: #5d5a55;
  --accent: #b5622f;
  --rule: #d7d2c9;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--ink);
  background: radial-gradient(900px 400px at 20% -10%, #f2e8dc 0%, transparent 60%),
              radial-gradient(900px 400px at 90% 10%, #e7f0ee 0%, transparent 55%),
              var(--bg);
}

.site-header {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 22px 8px;
  display: grid;
  gap: 10px;
  border-bottom: 1px solid var(--rule);
}

.brand {
  font-family: "Source Serif 4", serif;
  font-size: 30px;
  font-weight: 700;
}

.tagline {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-size: 12px;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.top-nav a {
  text-decoration: none;
  color: var(--ink);
  font-size: 14px;
}

.top-nav a:hover { color: var(--accent); }

.layout {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 22px 70px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 26px;
}

.toc {
  position: sticky;
  top: 20px;
  align-self: start;
  display: grid;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.toc-title {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 6px;
}

.toc a {
  text-decoration: none;
  color: var(--muted);
}

.toc a:hover { color: var(--accent); }

.content {
  font-family: "Source Serif 4", serif;
  font-size: 18px;
  line-height: 1.7;
}

.hero h1 {
  font-size: 36px;
  line-height: 1.15;
  margin: 0 0 10px;
}

.hero p { color: var(--muted); }

.keyword-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 12px 0 14px;
  font-size: 13px;
  font-family: "IBM Plex Sans", sans-serif;
}

.keyword-row span {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 4px 8px;
  border-radius: 999px;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 14px;
  font-family: "IBM Plex Sans", sans-serif;
}

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

h2 {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 18px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 36px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 6px;
}

.plain-list {
  padding-left: 18px;
  margin: 10px 0 0;
}

.papers {
  padding-left: 18px;
  margin: 10px 0 0;
  display: grid;
  gap: 12px;
}

.paper-title {
  font-weight: 700;
  display: block;
}

.paper-authors, .paper-journal {
  color: var(--muted);
  display: block;
  font-size: 15px;
}

.footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 22px 28px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 13px;
}

a { color: var(--accent); }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .toc { position: static; grid-template-columns: repeat(3, minmax(0,1fr)); }
}

@media (max-width: 640px) {
  .toc { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .hero h1 { font-size: 30px; }
}