:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5b6475;
  --line: #d9deea;
  --panel: #ffffff;
  --accent: #334155;
  --accent-soft: #eef2f7;
}

* { box-sizing: border-box; }
html { background: #f5f7fa; }
body {
  margin: 0;
  color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.shell {
  width: min(720px, calc(100% - 36px));
  margin: 7rem auto;
  padding: 3rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 12px 36px rgba(23, 32, 51, .07);
}
.eyebrow {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1 { margin: 0 0 1rem; font-size: clamp(2rem, 5vw, 3rem); line-height: 1.12; letter-spacing: -.03em; }
h2 { margin: 2.3rem 0 .65rem; color: var(--accent); font-size: 1.15rem; line-height: 1.3; }
p { margin: .75rem 0; }
.lead { max-width: 55ch; color: var(--muted); font-size: 1.15rem; }
.muted { color: var(--muted); font-size: .92rem; }
a { color: #1d4ed8; }
.links { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2.4rem; }
.links a {
  padding: .7rem 1rem;
  color: var(--ink);
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 650;
  text-decoration: none;
}
.links a:hover, .links a:focus-visible { border-color: var(--accent); }
footer { margin-top: 3rem; padding-top: 1rem; color: var(--muted); border-top: 1px solid var(--line); font-size: .88rem; }
.prose h1 { margin-bottom: .2rem; }
.back { margin-top: 3rem; }
@media (max-width: 600px) {
  .shell { width: min(100% - 24px, 720px); margin: 1.5rem auto; padding: 1.5rem; }
}