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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    width: 90%;
    margin: 0 auto;
    max-width: 1200px;
}

header {
    background: #c0392b; /* 赤いテーマカラー */
    color: #fff;
    padding: 1rem 0;
}

header h1 {
    text-align: center;
}

header nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 10px;
}

header nav ul li {
    margin: 0 15px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

header nav ul li a:hover {
    text-decoration: underline;
}

main {
    padding: 2rem 0;
}

article {
    background: #fff;
    padding: 2rem;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    margin: 1rem 0;
}

article h2 {
    margin-bottom: 1rem;
    font-size: 2rem;
}

article .meta {
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

article h3 {
    margin-top: 1.5rem;
    font-size: 1.5rem;
}

article p {
    margin-bottom: 1rem;
}

footer {
    background: #c0392b; /* 赤いテーマカラー */
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    header nav ul {
        flex-direction: column;
    }

    header nav ul li {
        margin: 10px 0;
    }
    
    article {
        padding: 1rem;
    }
}