/* 首次打开（还没有任何历史记录）时显示在历史区的介绍；有记录后由 seo-intro.js 隐藏 */
#seoIntro { flex: 1 1 auto; min-height: 0; padding: 14px 16px 12px; color: var(--text); overflow-y: auto; max-height: 100%; box-sizing: border-box; }
#seoIntro h1 { margin: 0 0 6px; font-size: 20px; line-height: 1.25; color: var(--primary); font-weight: 700; }
#seoIntro p { margin: 0 0 8px; font-size: 13.5px; line-height: 1.5; color: var(--text); opacity: 0.85; }
#seoIntro p.seo-lead { font-size: 15px; font-weight: 600; opacity: 1; }
#seoIntro ul { margin: 0 0 8px; padding-inline-start: 18px; font-size: 13px; line-height: 1.5; opacity: 0.85; }
#seoIntro li { margin-bottom: 3px; }
#seoIntro .seo-links { font-size: 13px; opacity: 1; }
#seoIntro a { color: var(--primary); text-decoration: none; }
#seoIntro[hidden] { display: none !important; }

#seoIntro .seo-languages { font-size: 13px; line-height: 1.6; margin-block: 8px; }
#seoIntro .seo-languages summary { cursor: pointer; color: var(--primary); }
#seoIntro .seo-languages nav { display: flex; flex-wrap: wrap; gap: 5px 12px; margin-top: 8px; }
#seoIntro a:hover { text-decoration: underline; }
#seoIntro a:focus-visible, #seoIntro summary:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }