:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ink: #17213d;
  --muted: #58637d;
  --paper: #fffdf7;
  --card: #ffffff;
  --indigo: #23266f;
  --mint: #47dfbb;
  --coral: #ff807d;
  --line: rgba(35, 38, 111, 0.14);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 0%, rgba(71, 223, 187, 0.18), transparent 28rem),
    var(--paper);
  color: var(--ink);
  line-height: 1.6;
}
header {
  background: var(--indigo);
  color: white;
  padding: 1rem 1.25rem;
}
nav {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: auto;
  max-width: 880px;
}
.brand { color: white; font-size: 1.2rem; font-weight: 800; text-decoration: none; }
.navlinks { display: flex; flex-wrap: wrap; gap: 1rem; }
.navlinks a { color: #c9fff2; font-weight: 650; }
main { margin: auto; max-width: 880px; padding: 3rem 1.25rem 5rem; }
.eyebrow {
  color: var(--indigo);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .09em;
  text-transform: uppercase;
}
h1 { font-size: clamp(2rem, 7vw, 3.6rem); line-height: 1.05; margin: .4rem 0 1rem; }
h2 { color: var(--indigo); font-size: 1.35rem; margin-top: 2rem; }
h3 { margin-bottom: .25rem; }
p, li { max-width: 72ch; }
.lede { color: var(--muted); font-size: 1.12rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 18px 50px rgba(35, 38, 111, 0.08);
  margin: 1.5rem 0;
  padding: 1.25rem;
}
.callout { border-left: 5px solid var(--mint); }
.warning { border-left: 5px solid var(--coral); }
a { color: var(--indigo); }
.button {
  background: var(--indigo);
  border-radius: 999px;
  color: white;
  display: inline-block;
  font-weight: 750;
  margin: .5rem 0;
  padding: .75rem 1.1rem;
  text-decoration: none;
}
.meta { color: var(--muted); font-size: .9rem; }
footer { border-top: 1px solid var(--line); color: var(--muted); padding-top: 1.5rem; }
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f4f7ff;
    --muted: #bac4df;
    --paper: #10142d;
    --card: #191e3d;
    --indigo: #8ff2da;
    --line: rgba(201, 255, 242, 0.18);
  }
  header { background: #090c23; }
  .button { background: #47dfbb; color: #10142d; }
}