body {
  font-family: "Segoe UI", "Hiragino Sans", "Meiryo", sans-serif;
  background: #f8f9fa;
  color: #222;
  margin: 0;
  padding: 0;
}
header {
  background: #2d3e50;
  color: #fff;
  padding: 2rem 1rem 1.2rem 1rem;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
h1 {
  margin: 0 0 0.5em 0;
  font-size: 2.2em;
  letter-spacing: 0.05em;
}
main {
  max-width: 600px;
  margin: 2.5rem auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
  padding: 2.5rem 2rem 2rem 2rem;
}
h2 {
  font-size: 1.3em;
  margin-top: 0;
  color: #2d3e50;
  border-left: 4px solid #4e8cff;
  padding-left: 0.5em;
  margin-bottom: 1em;
}
ul {
  padding-left: 1.2em;
}
li {
  margin-bottom: 1em;
  font-size: 1.1em;
}
a {
  color: #4e8cff;
  text-decoration: none;
  border-bottom: 1px dotted #4e8cff;
  transition: border 0.2s;
}
a:hover {
  border-bottom: 2px solid #4e8cff;
  color: #1a5dcc;
}
.note {
  margin-top: 2em;
  color: #666;
  font-size: 0.98em;
}