.lesson-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-top:6px}.pill-week{border-color:var(--accent);color:var(--accent)}.lesson-steps-count{color:var(--text-faint);font-size:12px}.lesson-landing{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:start}.lesson-landing-copy h1{margin:8px 0 10px;font-size:30px;line-height:1.15}.lesson-landing-lead{color:var(--text-dim);font-size:16px;line-height:1.6;margin:0 0 18px}.lesson-landing-actions{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}.lesson-outline{list-style:none;margin:0;padding:0;counter-reset:lesson-step}.lesson-outline li{display:grid;grid-template-columns:24px minmax(0,1fr);gap:10px;padding:10px 0;border-top:1px solid var(--line)}.lesson-outline li:before{counter-increment:lesson-step;content:counter(lesson-step);display:grid;place-items:center;width:22px;height:22px;border:1px solid var(--line-strong);border-radius:50%;color:var(--text-faint);font-size:11px;font-variant-numeric:tabular-nums}.lesson-outline-title{font-weight:600}.lesson-outline-check{display:block;margin-top:2px;color:var(--text-faint);font-size:12px}.lesson-empty{text-align:center;max-width:560px;margin-inline:auto;color:var(--text-dim);padding:14px 0}.lesson-demo{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(240px,.75fr);gap:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--bg-panel)}.lesson-demo-stage{position:relative;min-width:0;background:var(--canvas-bg)}.lesson-demo-bar{display:flex;align-items:center;gap:8px;padding:8px 12px;border-bottom:1px solid var(--line);font-size:12px;color:var(--text-dim)}.lesson-demo-readout{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:11px;color:var(--text-faint)}.lesson-demo-panel{display:flex;flex-direction:column;gap:10px;padding:14px;border-left:1px solid var(--line);background:var(--bg-raised);font-size:13px;line-height:1.5}.lesson-demo-step{display:flex;flex-direction:column;gap:6px}.lesson-demo-step-head{display:flex;align-items:center;gap:8px;font-weight:600}.lesson-demo-n{display:grid;place-items:center;width:20px;height:20px;border:1px solid var(--line-strong);border-radius:50%;font-size:11px;font-variant-numeric:tabular-nums;color:var(--text-faint)}.lesson-demo-step.done .lesson-demo-n{border-color:var(--ok, #8ee0a1);color:var(--ok, #8ee0a1)}.lesson-demo-body{color:var(--text-dim);margin:0}.lesson-demo-result{min-height:18px;font-size:12px}.lesson-demo-result.pass{color:var(--ok, #8ee0a1)}.lesson-demo-result.fail{color:var(--danger-fg, #ff9a95)}.lesson-demo-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}.lesson-demo-foot{color:var(--text-faint);font-size:11px}@media(max-width:900px){.lesson-landing,.lesson-demo{grid-template-columns:minmax(0,1fr)}.lesson-demo-panel{border-left:0;border-top:1px solid var(--line)}}.lesson-demo [hidden],.lesson-mine[hidden]{display:none!important}.lesson-landing-copy .lesson-steps-count{display:block;margin:0 0 22px}.lesson-landing-copy .section-title{margin:0 0 6px;font-size:18px}.lesson-demo-left{display:flex;flex-direction:column;min-width:0;background:var(--canvas-bg)}.lesson-demo-left .lesson-demo-stage{flex:1 1 auto}.lesson-demo-panel label.lesson-demo-body{display:flex;align-items:flex-start;gap:8px;cursor:pointer}