* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Meiryo', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.8;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.content {
    background-color: #fff;
    padding: 50px 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header {
    text-align: center;
    padding-bottom: 30px;
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 28px;
    font-weight: 600;
    color: #2c3e50;
}

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

.message p {
    font-size: 16px;
    color: #555;
    margin-bottom: 15px;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .content {
        padding: 30px 20px;
    }
    
    .header h1 {
        font-size: 22px;
    }
    
    .message p {
        font-size: 14px;
    }
}