body {
    font-family: "Noto Sans JP", sans-serif;
    margin: 0;
    padding: 0;
    background: #f9fafb;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 30px 20px;
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

h2 {
    font-size: 16px;
    color: #666;
    margin-bottom: 30px;
}

.btn-area {
    text-align: center;
    margin-bottom: 40px;
}

.btn {
    padding: 12px 24px;
    margin: 10px;
    background: #2563eb;
    color: white;
    border-radius: 6px;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    transition: 0.2s;
}
.btn:hover {
    background: #1d4ed8;
}

/* 共通フッター */
.footer {
    margin-top: auto;
    background: #f1f5f9;
    padding: 20px 10px;
    text-align: center;
    font-size: 13px;
    color: #555;
    border-top: 1px solid #e2e8f0;
}