:root {
  color-scheme: light;
  --navy: #162d66;
  --blue: #1970c1;
  --orange: #ef6c00;
  --ink: #172033;
  --muted: #5f697d;
  --line: #dfe5ef;
  --surface: #ffffff;
  --background: #f4f6fa;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--navy), #1c438d 70%, var(--blue));
  color: #fff;
}

.hero::after {
  position: absolute;
  right: -5rem;
  bottom: -8rem;
  width: 20rem;
  height: 20rem;
  border: 3rem solid rgb(255 255 255 / 8%);
  border-radius: 50%;
  content: "";
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 4.5rem 1.25rem 4rem;
}

.hero--compact .hero__inner { padding-block: 3rem; }

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.4rem);
  letter-spacing: .02em;
  line-height: 1.2;
}

.eyebrow {
  margin: 0 0 .7rem;
  color: #dceaff;
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.brand {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.brand__mark {
  display: grid;
  width: 4.2rem;
  height: 4.2rem;
  border: 2px solid rgb(255 255 255 / 60%);
  border-radius: 1.25rem;
  background: rgb(255 255 255 / 12%);
  font-size: 2.1rem;
  place-items: center;
}

.brand p { margin: .2rem 0 0; color: #dceaff; }

.lead { max-width: 34rem; margin: 1.5rem 0 0; font-size: 1.08rem; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

section {
  margin: 1rem 0;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: 0 8px 24px rgb(22 45 102 / 5%);
}

h2 { margin: 0 0 .75rem; color: var(--navy); font-size: 1.25rem; }

section p:last-child { margin-bottom: 0; }

details { padding: .8rem 0; border-top: 1px solid var(--line); }
details:first-of-type { border-top: 0; }
details p { margin: .6rem 0 0; color: var(--muted); }
summary { cursor: pointer; font-weight: 700; }

.button {
  display: inline-block;
  padding: .7rem 1rem;
  border-radius: .7rem;
  background: var(--orange);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.button:focus-visible,
.button:hover { background: #d65f00; }

.note, .updated { color: var(--muted); font-size: .9rem; }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.25rem;
  padding: 1rem .4rem;
}

footer {
  padding: 0 1rem 2rem;
  color: var(--muted);
  font-size: .8rem;
  text-align: center;
}

@media (max-width: 480px) {
  .hero__inner { padding-top: 3.5rem; }
  .brand__mark { width: 3.5rem; height: 3.5rem; border-radius: 1rem; font-size: 1.8rem; }
  section { padding: 1.15rem; }
}

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