* {
  box-sizing: border-box;
}

body {
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  line-height: 1.8;
  color: #2c3e50;
  background: linear-gradient(160deg, #f7f8fc 0%, #eef1f6 50%, #e8ecf2 100%);
  min-height: 100vh;
  margin: 0;
  padding: 2.5rem 1.25rem;
}

main {
  max-width: 40rem;
  margin: 0 auto;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #1a1d2e;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #3d4f5f;
  margin: 0 0 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid rgba(92, 124, 153, 0.2);
}

.lead {
  color: #5c6d7e;
  font-size: 0.95rem;
  margin: 0 0 1.75rem;
}

section {
  background: #fff;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(26, 29, 46, 0.06);
  border: 1px solid rgba(92, 124, 153, 0.08);
}

section p {
  margin: 0 0 0.5rem;
  font-size: 0.9375rem;
}

section p:last-child {
  margin-bottom: 0;
}

a {
  color: #4a7c9e;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

a:hover {
  color: #2d5a7b;
  text-decoration: underline;
}

a[href^="mailto:"] {
  word-break: break-all;
}

.footer {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(92, 124, 153, 0.15);
  font-size: 0.875rem;
  color: #6b7c8d;
}

.footer a {
  color: #5c7c99;
}