/* 实验室 / 幻灯片页面外壳：这些页面用 Tailwind 排版，这里只调和站点页头页脚与其配色。 */
body.lab-shell { background: #f8fafc; font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif; }
body.lab-shell .site-header { background: rgba(248, 250, 252, .88); border-bottom-color: #e2e8f0; }
body.lab-shell .site-main { padding-top: var(--header-h); min-height: 100vh; }
body.lab-shell .site-footer { margin-top: 40px; border-top-color: #e2e8f0; background: #f1f5f9; }
body.lab-shell .site-nav > a { color: #475569; }
body.lab-shell .site-nav > a:hover { background: #e2e8f0; color: #0f172a; }
body.lab-shell .site-nav > a.active { color: #0f172a; }
body.lab-shell .nav-tutor { background: #fff; border-color: #e2e8f0; }
body.lab-shell.slides-page .site-footer { display: none; }
body.lab-shell.slides-page .slides-wrap { padding-top: calc(var(--header-h) + 1rem); }