:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: #f5f8ff;
  color: #10204a;
}

body {
  margin: 0;
}

main {
  box-sizing: border-box;
  max-width: 760px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 64px 24px;
}

.mascot {
  width: 112px;
  height: 112px;
  border-radius: 24px;
}

h1 {
  margin: 24px 0 8px;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.08;
}

h2 {
  margin-top: 2rem;
}

p, li {
  font-size: 1.05rem;
}

.lead {
  color: #47608f;
  font-size: 1.2rem;
}

.card {
  margin-top: 2rem;
  padding: 20px 24px;
  border: 1px solid #cbd7f0;
  border-radius: 20px;
  background: #ffffff;
}

a {
  color: #0b57d0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 2rem;
}

@media (prefers-color-scheme: dark) {
  :root { background: #0c1324; color: #eef3ff; }
  .lead { color: #afc1e8; }
  .card { background: #151f35; border-color: #31415f; }
  a { color: #8ab4ff; }
}