.ann-lesson{--al-accent:var(--accent);--al-muted:var(--muted);--al-panel:var(--nb-panel);color:var(--nb-fg);background:transparent;border:0;border-radius:0;padding:0;margin:24px 0;min-width:0}
.ann-lesson *{box-sizing:border-box}.ann-lesson [hidden]{display:none!important}
.ann-lesson h2{font-size:clamp(24px,4vw,36px);line-height:1.15;margin:8px 0 16px}.ann-lesson h3{font-size:19px;margin:0 0 10px}
.ann-lesson p{line-height:1.7;max-width:78ch}.ann-lesson .al-kicker{color:var(--al-accent);letter-spacing:.08em;font-size:12px;font-weight:700}
.al-intro,.al-caption{color:var(--al-muted)}.al-caption{font-size:13px;margin:8px 0}.al-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:20px 0}
.ann-lesson button,.ann-lesson select{font:inherit;min-height:44px;border-radius:9px;padding:8px 12px;border:1px solid var(--line);background:transparent;color:inherit;cursor:pointer}
.ann-lesson button[aria-pressed=true],.ann-lesson button.al-primary{background:var(--nb-selected);border-color:var(--al-accent)}.ann-lesson button:disabled{opacity:.45;cursor:default}
.ann-lesson :focus-visible{outline:2px solid var(--al-accent);outline-offset:3px}.ann-lesson label{display:flex;align-items:center;gap:8px;font-size:14px}
.al-sections{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:18px}.al-sections button{font-size:13px;flex:1 0 auto}
.al-explanation{background:transparent;border-radius:0;padding:0;min-width:0}.al-explanation p{margin:7px 0 16px}.al-explanation b{color:var(--al-accent)}
.al-equation{font-family:ui-monospace,monospace;font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--nb-panel);padding:14px;border-left:3px solid var(--al-accent);border-radius:5px;line-height:1.7}
.al-graphs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:18px 0}.al-graphs figure{margin:0;padding:15px;background:var(--al-panel);border-radius:14px;min-width:0}.al-graphs figcaption{font-size:15px;font-weight:700;margin-bottom:8px}.al-graphs svg{display:block;width:100%;height:auto;overflow:visible}
.al-graphs text{fill:var(--muted);font:12px system-ui}.al-graphs .al-axis{stroke:var(--muted);stroke-width:1}.al-graphs .al-loss{fill:none;stroke:var(--accent);stroke-width:2.5}.al-graphs .al-dot{fill:var(--nb-fg);stroke:var(--nb-bg);stroke-width:2}
.al-scrub{display:grid;grid-template-columns:auto minmax(80px,1fr) auto;gap:12px;align-items:center;margin:18px 0}.al-scrub input{width:100%;accent-color:var(--al-accent);min-height:44px}.al-scrub output{font-variant-numeric:tabular-nums;font-size:13px}
.al-network{width:100%;max-height:150px}.al-network text{fill:var(--nb-fg);font:14px system-ui}.al-network line{stroke:#4a738a;stroke-width:2}.al-network circle{fill:var(--nb-panel);stroke:var(--accent);stroke-width:2}.al-network .al-focus{fill:var(--nb-selected);stroke:var(--accent);stroke-width:3}
.al-details{border-top:1px solid var(--line);padding-top:16px;margin-top:16px}.al-details summary{cursor:pointer;min-height:44px;line-height:1.6}.al-details pre{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7;color:var(--nb-fg);font-size:13px}.al-notice{border-left:3px solid #ffca80;padding-left:14px;color:var(--muted);font-size:14px}
@media(max-width:600px){.al-graphs{grid-template-columns:minmax(0,1fr)}.al-explanation{padding:0}.al-sections{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.al-sections button{min-width:0;font-size:12px}.al-scrub{grid-template-columns:1fr auto}.al-scrub label{grid-column:1/-1}.al-controls button{flex:1 1 auto}}
@media(prefers-reduced-motion:reduce){.ann-lesson *{scroll-behavior:auto!important;animation:none!important;transition:none!important}}