- BaseLayout:字体三轨统持、viewport-fit=cover、theme-color 双套、skip-link - Header:≤4 项导航纪律 + sticky 毛玻璃 + aria-current;搜索 icon 占位待 T8 - Footer:ICP 备案链接(法定保留)+ built-from 具名槽位待 T7 - ThemeScript:head 内联先于首帧,手选 > 系统偏好,防白闪 验证: pnpm astro build exit 0;dist/index.html 含 ICP 文案与跳到正文链 Spec: 2026-10-24_add-blog-skeleton Co-authored-by: GLM-5.3