body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f6f8fa;
  color: #1f2933;
  line-height: 1.6;
}

header {
  background: #0a2a43;
  color: #ffffff;
  padding: 3rem 1.5rem;
  text-align: center;
}

header h1 {
  margin-bottom: 0.5rem;
  font-size: 2.4rem;
}

.subtitle {
  max-width: 700px;
  margin: 0 auto;
  opacity: 0.9;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  background: #ffffff;
}

section {
  margin-bottom: 2.5rem;
}

h2 {
  color: #0a2a43;
  margin-bottom: 0.5rem;
}

ul {
  padding-left: 1.2rem;
}

li {
  margin-bottom: 0.4rem;
}

.hint {
  font-size: 0.9rem;
  color: #5a6b7b;
}

.contact {
  background: #eef4f8;
  padding: 1.5rem;
  border-left: 4px solid #1780b6;
}

a {
  color: #1780b6;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

hr {
  margin: 3rem 0;
  border: none;
  border-top: 1px solid #dce3ea;
}

footer {
  text-align: center;
  font-size: 0.85rem;
  color: #6b7280;
  padding: 2rem 1rem;
}