body {
    font-family: 'Yu Gothic', 'Meiryo', sans-serif;
    background: #f8f9fa;
    color: #222;
    margin: 0;
    padding: 0;
}
header {
    background: #003366;
    color: #fff;
    padding: 20px 0 10px 0;
    text-align: center;
}
header h1 {
    margin: 0 0 10px 0;
    font-size: 2.2em;
    letter-spacing: 2px;
}
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 30px;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    transition: color 0.2s;
}
nav ul li a:hover {
    color: #ffcc00;
}
main {
    max-width: 900px;
    margin: 30px auto;
    background: #fff;
    padding: 30px 25px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}
h2 {
    color: #003366;
    border-left: 5px solid #ffcc00;
    padding-left: 10px;
    margin-top: 0;
}
footer {
    background: #003366;
    color: #fff;
    text-align: center;
    padding: 15px 0;
    margin-top: 40px;
}
.btn {
    display: inline-block;
    background: #003366;
    color: #fff;
    padding: 10px 22px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 10px;
    transition: background 0.2s;
}
.btn:hover {
    background: #ffcc00;
    color: #003366;
}
dl dt {
    font-weight: bold;
    margin-top: 18px;
}
dl dd {
    margin-left: 0;
    margin-bottom: 10px;
}