/* Chapters extension layer - visual locked from V1.2.0. Keep empty unless needed. */
.chapter-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:12px}.lesson h2{font-size:28px;margin:0 0 8px}.lesson h3{margin-top:22px}.lesson p{line-height:1.6}.lesson-list{display:grid;gap:10px;margin:14px 0}.lesson-item{border:1px solid #d8dde3;border-radius:8px;padding:13px;background:#fff}.lesson-item b{color:#111}.command-block{background:#0b0b0b;color:#fff;border-radius:7px;padding:14px;margin:12px 0;font-family:Menlo,Consolas,monospace;white-space:pre-wrap}.run-row{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0 18px}.callout{border-left:5px solid var(--red);background:#fff7f7;padding:14px;border-radius:6px;margin:14px 0}.okbox{border-left:5px solid var(--green);background:#f3fff6;padding:14px;border-radius:6px;margin:14px 0}.chapter-actions{display:flex;justify-content:space-between;gap:12px;margin-top:24px}.small-terminal{min-height:260px}.module-open{display:block;text-decoration:none;color:inherit}.module-open:hover .module{filter:brightness(1.08)}
@media(max-width:1100px){.chapter-layout{grid-template-columns:1fr}}