.oa_wrap { max-width: 900px; margin: 0 auto; padding: 8px 16px 40px; }
.oa_intro { color: #555; margin: 0 0 16px; }
.oa_search_bar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 14px; }
.oa_search_input { flex: 1 1 260px; padding: 10px 14px; border: 1px solid #ccc; border-radius: 6px; font-size: 1em; }
.oa_status { color: #666; font-size: .9em; }
.oa_letters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.oa_letter { display: inline-block; min-width: 32px; padding: 4px 8px; text-align: center; border: 1px solid #ccd; border-radius: 4px; text-decoration: none; }
.oa_letter:hover { background: #eef3f8; }
.oa_group { margin-bottom: 22px; }
.oa_group_letter { margin: 0 0 8px; padding-bottom: 4px; border-bottom: 2px solid #1a5f9c; color: #1a5f9c; font-size: 1.4em; }
.oa_list { list-style: none; margin: 0; padding: 0; columns: 2 280px; column-gap: 32px; }
.oa_item { break-inside: avoid; padding: 3px 0; }
.oa_count { color: #888; font-size: .85em; margin-left: 6px; }
.oa_noresults { color: #a15c00; }
.oa_back { margin-bottom: 8px; }
.oa_affiliation { color: #555; font-size: 1.05em; margin-top: -4px; }
.oa_articles_title { margin-top: 24px; }
.oa_articles { padding-left: 22px; }
.oa_article { margin-bottom: 14px; }
.oa_article_meta { color: #777; font-size: .9em; margin-top: 2px; }