body {
    font-family: 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f7fa;
    color: #333;
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}
header {
    text-align: center;
    padding: 50px 0;
    background: #007bff;
    color: white;
}
header h1 {
    font-size: 3em;
    margin-bottom: 10px;
}
header p {
    font-size: 1.2em;
}
section {
    background: white;
    margin: 20px 0;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.activities {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.activity {
    flex: 1 1 300px;
    margin: 20px;
    text-align: center;
}
.activity i {
    font-size: 3em;
    color: #667eea;
    margin-bottom: 20px;
}
.join-us {
    text-align: center;
    background: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
}
.btn {
    display: inline-block;
    padding: 15px 30px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
}
.btn:hover {
    background: #5a6fd8;
}
footer {
    text-align: center;
    padding: 20px;
    color: white;
}