400 — 所有內文與表格內容--font-weight-normal

500 — 按鈕、卡片標題、表單標籤、選中的分頁--font-weight-medium

700 — MaiGPT 側欄品牌標題（僅此一處）--font-weight-bold

Selected menu items, active tabs and the current breadcrumb are tinted — the source explicitly removed their bold weight.