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.pt{overflow:hidden;font-family:var(--font-head);font-size:14px;font-weight:600;text-overflow:ellipsis;white-space:nowrap}.fqs .lesson-end-prev{grid-column:1;justify-self:start}.fqs .lesson-end-toggle{grid-column:2;justify-self:center}.fqs .lesson-end-next{grid-column:3;justify-self:end;text-align:right}.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:oklch(.9 .005 210);color:oklch(.2 .012 240);font-family:var(--font-mono,ui-monospace,"SF Mono",Menlo,monospace);font-size:12.5px;padding:10px 18px;border-radius:8px;z-index:100;opacity:0}@media (prefers-reduced-motion:no-preference){.toast{transition:opacity .18s ease,transform .18s ease}}.toast.show{opacity:1;transform:translateX(-50%) translateY(-4px)}@media (max-width:1080px){.fqs .lesson-grid{grid-template-columns:1fr;gap:0}.fqs .side{display:none}}@media (max-width:760px){.fqs .nav-links .nav-link.hide-m{display:none}.fqs .wrap{padding:0 18px}.fqs .lesson-shell{padding-top:24px;padding-bottom:48px}.fqs .meta-row{grid-template-columns:1fr;gap:4px}.fqs .lesson-end{grid-template-columns:1fr;justify-items:stretch}.fqs .lesson-end-next,.fqs .lesson-end-prev,.fqs .lesson-end-toggle{grid-column:1;justify-self:stretch}.fqs .lesson-end-next{text-align:left}.fqs .ai-copy,.fqs .diagram-cols{grid-template-columns:1fr}}.fqs .lesson-preview-body{position:relative}.fqs .lesson-preview-body>div:first-child{mask-image:linear-gradient(180deg,black 78%,transparent);-webkit-mask-image:linear-gradient(180deg,black 78%,transparent)}.fqs .lesson-preview-fade{position:absolute;left:0;right:0;bottom:0;height:180px;background:linear-gradient(to bottom,transparent,var(--bg));pointer-events:none}.fqs .lesson-paywall{margin:10px 0 0;padding:28px;border:1px solid var(--hairline);border-radius:14px;background:var(--surface)}.fqs .lesson-paywall-icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:10px;background:var(--accent-soft);color:var(--accent-strong);margin-bottom:14px}.fqs .lesson-paywall-toc{margin:4px 0 22px}.fqs .lesson-paywall-toc ul{list-style:none;margin:0;padding:0;display:grid;gap:7px}.fqs .lesson-paywall-toc li{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:14.5px}.fqs .lesson-paywall-toc li svg{color:var(--fg-2);opacity:.6;flex-shrink:0}.fqs .lesson-paywall-actions{display:flex;flex-wrap:wrap;gap:10px}