@import url('https://fonts.googleapis.com/css2?family=Newsreader:opsz,wght@6..72,400;6..72,500&family=Inter:wght@400;500&display=swap');

:root {
  --text-primary: #1a1a18;
  --text-secondary: #5f5e5a;
  --border: #e4e2db;
  --bg: #ffffff;
  --max-w: 640px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 6rem;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0 1.5rem;
  border-bottom: 0.5px solid var(--border);
  margin-bottom: 2.5rem;
}

nav .brand {
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-primary);
}

nav .links {
  display: flex;
  gap: 24px;
}

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

nav .links a.active,
nav .links a:hover {
  color: var(--text-primary);
  font-weight: 500;
}

h1 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 38px;
  line-height: 1.25;
  margin: 0 0 2rem;
  max-width: 520px;
}

.lede {
  font-size: 17px;
  line-height: 1.7;
  margin: 0 0 2.5rem;
  max-width: 520px;
}

section {
  border-top: 0.5px solid var(--border);
  padding-top: 2rem;
  margin-bottom: 2.5rem;
}

section p {
  color: var(--text-secondary);
  margin: 0 0 1.25rem;
}

section p:last-child { margin-bottom: 0; }

.pillars {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.pillars h3, .join h3 {
  font-size: 16px;
  font-weight: 500;
  margin: 0 0 0.5rem;
}

.pillars p, .join p {
  font-size: 15px;
  color: var(--text-secondary);
  margin: 0;
}

footer {
  border-top: 0.5px solid var(--border);
  padding-top: 2rem;
  margin-top: 3rem;
  font-size: 13px;
  color: var(--text-secondary);
}

.placeholder {
  color: var(--text-secondary);
  font-size: 16px;
}

/* Research listing */
.post-item {
  display: block;
  padding: 1.25rem 0;
  border-top: 0.5px solid var(--border);
  text-decoration: none;
  color: inherit;
}

.post-item:first-of-type { border-top: none; }

.post-item .post-title {
  font-size: 17px;
  font-weight: 500;
  margin: 0 0 0.35rem;
  color: var(--text-primary);
}

.post-item .post-meta {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
}

/* Article page */
article h1 { font-size: 32px; }

.article-meta {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0 0 2rem;
}

article h2 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 22px;
  margin: 2.5rem 0 1rem;
}

article p {
  color: var(--text-primary);
  margin: 0 0 1.25rem;
}

article ul.toc {
  list-style: none;
  padding: 0;
  margin: 0 0 2.5rem;
  border-top: 0.5px solid var(--border);
  border-bottom: 0.5px solid var(--border);
  padding: 1.25rem 0;
}

article ul.toc li { margin-bottom: 0.4rem; }
article ul.toc a { color: var(--text-secondary); font-size: 14px; text-decoration: none; }
article ul.toc a:hover { color: var(--text-primary); }

article .refs {
  font-size: 15px;
  color: var(--text-secondary);
}

article .refs li { margin-bottom: 0.75rem; }

article pre {
  background: #faf9f6;
  border: 0.5px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  font-size: 13px;
  overflow-x: auto;
}

@media (max-width: 480px) {
  h1 { font-size: 30px; }
  nav .links { gap: 14px; }
}