body {
  margin: 0;
  background: #eaf4ff;
  color: #12305a;
  font-family: "Hiragino Maru Gothic ProN", system-ui, sans-serif;
  line-height: 1.8;
}
main { max-width: 680px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 26px; }
h2 { font-size: 18px; margin-top: 28px; }
a { color: #1f6fd1; }
button {
  padding: 10px 22px;
  border: 0;
  border-radius: 999px;
  background: #ff7a45;
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
button:disabled { background: #9fb3cf; cursor: default; }
.note { font-size: 13px; opacity: 0.8; }