:root {
  color-scheme: light dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0d1220;
  color: #e9eefb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #192848 0, #0d1220 48rem);
}

main {
  width: min(760px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4rem 0;
}

header, section, nav, footer {
  background: rgba(19, 27, 48, 0.88);
  border: 1px solid #2d3d62;
  border-radius: 18px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2.4rem, 8vw, 4.5rem); margin: .2rem 0 .75rem; }
h2 { margin-top: 0; color: #b9d1ff; }
p, li { line-height: 1.65; }
.lead { font-size: 1.15rem; color: #cbd8f3; }
.eyebrow { color: #86b6ff; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
a { color: #8fc2ff; }
nav { display: flex; flex-wrap: wrap; gap: 1rem; }
footer { color: #aebbd5; }

@media (prefers-color-scheme: light) {
  :root { background: #f5f7fc; color: #18233a; }
  body { background: linear-gradient(#e9f0ff, #f8faff); }
  header, section, nav, footer { background: rgba(255,255,255,.92); border-color: #d8e1f2; }
  h2 { color: #294d88; }
  .lead { color: #40506e; }
  .eyebrow, a { color: #145bb8; }
  footer { color: #52617c; }
}