:root {
  color-scheme: light;
  --navy: #101d45;
  --blue: #315fdc;
  --mint: #58dbc0;
  --ink: #17213d;
  --muted: #66718b;
  --line: #dbe2ef;
  --paper: #f4f7fc;
  --white: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--blue); }

.topbar {
  background: var(--navy);
  color: var(--white);
  padding: 1rem 1.25rem;
}

.nav {
  width: min(100%, 980px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--white);
  font-size: 1.12rem;
  font-weight: 760;
  text-decoration: none;
}

.links { display: flex; flex-wrap: wrap; gap: .8rem 1.2rem; }
.links a { color: #dfe8ff; text-decoration: none; }
.links a:hover, .links a:focus { color: var(--mint); }

main {
  width: min(calc(100% - 2rem), 880px);
  margin: 2rem auto 4rem;
}

.hero {
  background: linear-gradient(140deg, var(--navy), #263e83);
  color: var(--white);
  padding: clamp(2rem, 7vw, 4.5rem);
  border-radius: 28px;
  box-shadow: 0 24px 55px rgba(16, 29, 69, .16);
}

.eyebrow {
  color: var(--mint);
  font-size: .84rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

h1 { margin: .4rem 0 .8rem; font-size: clamp(2rem, 6vw, 3.6rem); line-height: 1.08; }
h2 { margin: 2.2rem 0 .55rem; color: var(--navy); line-height: 1.25; }
p { margin: .5rem 0 1rem; }

.card {
  margin-top: 1.25rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.5rem;
}

.card h2:first-child { margin-top: 0; }
.notice { border-left: 5px solid var(--mint); }
.button {
  display: inline-block;
  margin-top: .5rem;
  padding: .75rem 1rem;
  border-radius: 12px;
  background: var(--blue);
  color: var(--white);
  font-weight: 700;
  text-decoration: none;
}

.meta { color: var(--muted); font-size: .92rem; }
ol, ul { padding-left: 1.4rem; }
footer { width: min(calc(100% - 2rem), 880px); margin: 0 auto 2rem; color: var(--muted); }

@media (max-width: 680px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .links { gap: .5rem 1rem; }
  main { margin-top: 1rem; }
  .hero, .card { border-radius: 18px; }
}