/* ===== 基本タイポグラフィ ===== */ body { font-family: "Inter", "Roboto", "Helvetica Neue", Arial, sans-serif; font-size: 16.5px; line-height: 1.8; color: #2b2b2b; background-color: #ffffff; margin: 0; padding: 0; } /* ===== コンテンツコンテナ ===== */ .article-container { max-width: 860px; margin: 0 auto; padding: 40px 24px; } /* ===== 見出し ===== */ h1 { font-size: 34px; line-height: 1.3; font-weight: 700; margin...