:root {
  --bg: #0c0f13;
  --surface: #171c22;
  --line: #262d35;
  --ink: #f3f5f7;
  --ink-2: #adb7c0;
  --ink-3: #8794a0;
  --accent: #3e9cdb;
  --wrap: 720px;
  --pad: 22px;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.55;
  min-height: 100vh;
}

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

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

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
.site-header .wrap, .site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 13px;
}
.brand:hover { text-decoration: none; }
.mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  display: grid;
  place-items: center;
  font-family: "Times New Roman", Times, serif;
  font-size: 14px;
  color: var(--accent);
}
.nav { display: flex; gap: 18px; font-size: 15px; }

.hero { padding: 48px 0 24px; }
.hero h1 {
  font-family: "Times New Roman", Times, serif;
  font-size: 34px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.lede { margin-top: 12px; color: var(--ink-2); max-width: 38em; }
.updated { margin-top: 10px; color: var(--ink-3); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; }

.prose { padding: 8px 0 72px; }
.prose h2 {
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 32px 0 10px;
}
.prose p, .prose li { color: var(--ink-2); }
.prose p + p { margin-top: 12px; }
.prose ul { margin: 10px 0 0 1.2em; }
.prose li { margin: 6px 0; }
.prose strong { color: var(--ink); font-weight: 600; }

details {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 10px 0;
  background: var(--surface);
}
summary { cursor: pointer; color: var(--ink); font-weight: 500; }
details p, details ul { margin-top: 10px; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 40px;
  color: var(--ink-3);
  font-size: 14px;
}
.footer-links { display: flex; gap: 16px; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}
.links a {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 16px;
  color: var(--ink);
  background: var(--surface);
}
.links a:hover { border-color: var(--accent); text-decoration: none; }