body {
  font-family: "Meiryo", Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #333;
}

header, footer {
  background-color: #004080;
  color: white;
  padding: 1rem;
  text-align: center;
}

main {
  padding: 1rem;
  max-width: 800px;
  margin: auto;
}

.section {
  margin-bottom: 1.5rem;
  background: #fff;
  padding: 1rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

iframe {
  width: 100%;
  height: 250px;
  border: 0;
}

a {
  color: #004080;
}

.highlight {
  color: red;
  font-weight: bold;
}

@media (max-width: 600px) {
  body {
    font-size: 0.95rem;
  }
}