body {
    margin: 0;
    font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
    background: #f7f9fc;
    color: #333;
}

header {
    background: white;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 22px;
    color: #0066cc;
    margin: 0;
    font-weight: 600;
}

nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.hero {
    padding: 80px 20px;
    text-align: center;
    background: linear-gradient(135deg, #e7f2ff, #ffffff);
}

.hero h2 {
    font-size: 32px;
    margin-bottom: 10px;
    color: #004a99;
}

.hero p {
    font-size: 18px;
    color: #666;
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 14px 28px;
    background: #0066cc;
    color: white;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
}

.section {
    padding: 60px 20px;
    max-width: 1100px;
    margin: auto;
    text-align: center;
}

.section h3 {
    font-size: 28px;
    margin-bottom: 40px;
    color: #004a99;
}

.cards {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 30px;
}

.card {
    width: 300px;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.08);
    text-align: left;
}

.card h4 {
    margin-top: 0;
    color: #0066cc;
}

footer {
    text-align: center;
    padding: 20px;
    background: #f0f4f8;
    margin-top: 40px;
    font-size: 14px;
}