:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  color: #18253a;
  background: #f6f1e8;
}

* { box-sizing: border-box; }

body { margin: 0; }

main {
  width: min(860px, calc(100% - 32px));
  margin: 32px auto;
  padding: 32px;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 8px 28px rgba(24, 37, 58, 0.09);
}

h1, h2 { color: #164d86; }
h1 { margin-top: 0; line-height: 1.2; }
h2 { margin-top: 30px; font-size: 1.15rem; }
a { color: #164d86; }
.meta, .note { color: #5c6675; }
.notice {
  padding: 14px 16px;
  border-left: 4px solid #e5ad23;
  background: #fff9e8;
}
.button {
  display: inline-block;
  margin: 8px 0;
  padding: 11px 16px;
  border-radius: 9px;
  background: #164d86;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}
footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid #dde3ea;
  color: #5c6675;
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  main { margin: 0; width: 100%; min-height: 100vh; padding: 24px 20px; border-radius: 0; }
}