* { box-sizing: border-box; }
    body { font-family: "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", "Osaka", "MS P Gothic", "ＭＳ Ｐゴシック", Verdana, sans-serif; background: #e7e5e6; color: #333; line-height: 1.6; margin: 0; }
    a { color: #38b7ee; text-decoration: none; }
    header, footer, .main-container { max-width: 1000px; margin: 0 auto; padding: 20px; }
    .main-header { background: #fff; padding: 20px; border-bottom: 5px solid #38b7ee; }
    .logo-placeholder { font-size: 24px; font-weight: bold; color: #38b7ee; text-transform: uppercase; }
    nav ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 15px; }
    .featured-box { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin: 20px 0; }
    .article-card { background: #fff; padding: 15px; border-radius: 4px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
    .image-placeholder { width: 100%; height: 160px; background: #ddd; display: flex; align-items: center; justify-content: center; color: #999; margin-bottom: 10px; }
    footer { background: #333; color: #fff; text-align: center; padding: 40px; margin-top: 40px; }
    @media (max-width: 768px) { .featured-box { grid-template-columns: 1fr; } }