:root {
  --bg: #0e0f11;
  --bg-2: #16181b;
  --surface: #1a1c20;
  --surface-2: #22252a;
  --line: #2a2d33;
  --line-2: #383c44;
  --fg: #edeef0;
  --fg-2: #c0c2c8;
  --fg-3: #868a93;
  --fg-4: #55585f;
  --accent: #d97a3a;
  --accent-ink: #0e0f11;
  --accent-soft: rgba(217, 122, 58, 0.13);
  --accent-line: rgba(217, 122, 58, 0.35);
  --f-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --f-mono: 'JetBrains Mono', ui-monospace, monospace;
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg-2);
  background: var(--bg);
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01', 'cv11';
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-brand { display: flex; align-items: center; gap: 10px; }
.site-brand .mark {
  width: 22px;
  height: 22px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 13px;
  letter-spacing: -0.01em;
}
.site-brand .wordmark { font-weight: 700; font-size: 16px; color: var(--fg); letter-spacing: -0.01em; }
.site-brand .accent { color: var(--accent); }
.site-nav { display: flex; gap: 20px; }
.site-nav a {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-3);
  padding: 6px 2px;
}
.site-nav a:hover { color: var(--fg-2); }
.site-nav a[aria-current="page"] { color: var(--fg); }

/* Layout */
main.article, main.research-index {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}
main.research-index { max-width: 960px; }

/* Article page */
.breadcrumb {
  font-size: 12px;
  color: var(--fg-4);
  margin-bottom: 32px;
  font-weight: 500;
}
.breadcrumb a { color: var(--fg-3); }
.breadcrumb a:hover { color: var(--fg-2); }
.category {
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 12px;
}
main.article h1 {
  font-size: 34px;
  line-height: 1.15;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  text-wrap: balance;
}
.meta {
  font-size: 13px;
  color: var(--fg-3);
  margin: 0 0 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}
.meta time, .meta .updated { font-family: var(--f-mono); font-size: 12px; }

.body { font-size: 16px; line-height: 1.7; color: var(--fg-2); }
.body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.015em;
  margin: 44px 0 14px;
  line-height: 1.3;
}
.body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  margin: 32px 0 10px;
}
.body p { margin: 14px 0; }
.body a {
  color: var(--fg);
  border-bottom: 1px solid var(--line-2);
  transition: border-color 0.12s;
}
.body a:hover { border-bottom-color: var(--accent); }
.body ul, .body ol { padding-left: 22px; margin: 14px 0; }
.body li { margin: 6px 0; }
.body strong { color: var(--fg); font-weight: 600; }

/* Sources block */
.sources {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.sources h2 {
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 12px;
}
.sources ol { padding-left: 20px; font-size: 14px; }
.sources li { margin: 4px 0; color: var(--fg-3); }
.sources a { color: var(--fg-2); border-bottom: 1px solid var(--line); }
.sources a:hover { color: var(--accent); border-bottom-color: var(--accent-line); }

/* Related reading */
.related {
  margin-top: 40px;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}
.related h2 {
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 12px;
}
.related ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.related a {
  display: block;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--fg-2);
  font-size: 14px;
  font-weight: 500;
  transition: border-color 0.12s, color 0.12s;
}
.related a:hover { border-color: var(--accent-line); color: var(--fg); }

/* Research index page */
.index-hero { margin-bottom: 56px; }
.index-hero .eyebrow {
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 12px;
}
.index-hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1.15;
  text-wrap: balance;
  max-width: 20ch;
}
.index-hero .intro {
  font-size: 16px;
  color: var(--fg-2);
  line-height: 1.6;
  max-width: 56ch;
  margin: 0;
}
.research-index section { margin-bottom: 48px; }
.research-index section > h2 {
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.article-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; }
@media (min-width: 720px) { .article-list { grid-template-columns: 1fr 1fr; } }
.article-list li { background: var(--bg); }
.article-list a {
  display: block;
  padding: 20px;
  color: var(--fg);
  height: 100%;
  transition: background 0.12s;
}
.article-list a:hover { background: var(--surface); }
.article-list h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin: 0 0 6px;
  line-height: 1.3;
}
.article-list .desc {
  font-size: 14px;
  color: var(--fg-3);
  margin: 0 0 12px;
  line-height: 1.5;
}
.article-list .meta {
  font-size: 12px;
  color: var(--fg-4);
  padding: 0;
  border: 0;
  margin: 0;
  font-variant-numeric: tabular-nums;
}
.article-list .meta time { font-family: var(--f-mono); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--fg-3);
  margin-top: 80px;
  gap: 20px;
  flex-wrap: wrap;
}
.site-footer a { color: var(--fg-3); border-bottom: 1px solid var(--line); }
.site-footer a:hover { color: var(--fg-2); }

@media (max-width: 640px) {
  main.article, main.research-index { padding: 32px 20px 64px; }
  main.article h1 { font-size: 28px; }
  .index-hero h1 { font-size: 28px; }
  .body h2 { font-size: 20px; margin-top: 36px; }
}