:root {
  color-scheme: light;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #10233f;
  background: #f5f1e8;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  line-height: 1.65;
  background:
    radial-gradient(circle at top right, rgba(54, 111, 168, .16), transparent 34rem),
    #f5f1e8;
}
main { width: min(780px, calc(100% - 32px)); margin: 0 auto; padding: 52px 0 72px; }
header { margin-bottom: 34px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #10233f; font-weight: 850; text-decoration: none; }
.mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: #173f6f; color: #fff; box-shadow: inset 0 0 0 2px rgba(255,255,255,.18); }
h1 { margin: 30px 0 10px; font-size: clamp(36px, 7vw, 56px); line-height: 1.03; letter-spacing: -.035em; }
h2 { margin: 32px 0 8px; font-size: 21px; letter-spacing: -.01em; }
h3 { margin: 0 0 6px; font-size: 18px; }
p, li { color: #40516a; }
.meta { margin: 0; color: #6c7788; }
.panel { padding: 30px; border: 1px solid rgba(16,35,63,.16); border-radius: 20px; background: rgba(255,255,255,.92); box-shadow: 0 18px 50px rgba(16,35,63,.09); }
.hero-copy { max-width: 640px; font-size: 18px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 28px; }
.card { display: block; padding: 20px; border: 1px solid rgba(16,35,63,.14); border-radius: 16px; background: #fff; color: #10233f; text-decoration: none; transition: transform .16s ease, box-shadow .16s ease; }
.card:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(16,35,63,.09); }
.card p { margin: 0; font-size: 14px; }
.notice { margin-top: 24px; padding: 16px 18px; border-left: 4px solid #c94a45; border-radius: 10px; background: #fff8f4; }
a { color: #135ea5; }
nav { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 40px; padding-top: 24px; border-top: 1px solid #d9dde3; }
nav a { color: #40516a; font-weight: 750; }
ul { padding-left: 22px; }
@media (max-width: 640px) {
  main { padding-top: 32px; }
  .panel { padding: 22px; border-radius: 16px; }
  .grid { grid-template-columns: 1fr; }
}