:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Yu Gothic", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f5f7f9;
  color: #20252c;
  line-height: 1.8;
}

header {
  background: #fff;
  border-bottom: 1px solid #e3e6ea;
  padding: 1rem max(1.25rem, calc((100% - 850px) / 2));
  font-weight: 700;
}

main {
  max-width: 850px;
  margin: 3rem auto;
  padding: 0 1.25rem;
}

article {
  background: #fff;
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid #e3e6ea;
  border-radius: 14px;
}

.eyebrow {
  color: #526477;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

h1 {
  line-height: 1.4;
  font-size: clamp(1.55rem, 5vw, 2.25rem);
  margin: 0.5rem 0 1.5rem;
}

p {
  margin: 0 0 1.2rem;
}

.notice {
  background: #ecf5f8;
  border-left: 4px solid #25789b;
  padding: 1rem 1.2rem;
  border-radius: 4px;
}

footer {
  max-width: 850px;
  margin: 2rem auto;
  padding: 0 1.25rem;
  color: #65707b;
  font-size: 0.85rem;
}