.lesson-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:55px}.lesson-toc{position:sticky;top:110px;display:flex;flex-direction:column;align-self:start;padding:20px;border:1px solid var(--line);border-radius:10px;font-size:12px}.lesson-toc strong{margin-bottom:12px}.lesson-toc a{padding:10px 0;color:var(--muted)}.lesson-toc a:hover{text-decoration:underline}.lesson-content{min-width:0}.lesson-content>section{margin-bottom:50px;scroll-margin-top:110px}.lesson-content>.inline-banner{margin-top:0}.lesson-content code{font-family:ui-monospace,Consolas,monospace;font-size:.9em;overflow-wrap:anywhere}.lesson-content p code,.lesson-content li code{background:var(--tint);padding:2px 5px;border-radius:4px}.lesson-definitions dt{margin-top:20px;font-weight:650}.lesson-definitions dd{margin:8px 0 0;color:var(--muted);font-size:14px}.lesson-playground{border:1px solid var(--line);border-radius:12px;overflow:hidden;padding:22px;background:white}.editor-label-row{display:flex;justify-content:space-between;gap:15px;font-size:12px;margin-bottom:10px}.editor-label-row label{font-weight:650}.editor-label-row span{color:var(--muted)}.lesson-playground textarea{width:100%;min-height:360px;resize:vertical;display:block;border:1px solid #60816e;border-radius:7px;background:var(--green);color:#eef5e6;padding:18px;font:13px/1.8 ui-monospace,Consolas,monospace;white-space:pre;tab-size:2;overflow:auto}.preview-label{font-size:12px;font-weight:650;padding:16px 0 10px}.lesson-playground iframe{width:100%;height:400px;border:1px solid var(--line);background:white;border-radius:7px}.lesson-status{font-size:12px;margin-top:15px;min-height:20px}.lesson-source{margin:25px 0 15px;border:1px solid var(--line);border-radius:8px;padding:15px}.lesson-source summary{cursor:pointer;font-size:14px;font-weight:600}.lesson-source pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px;line-height:1.65}.lesson-content .inline-banner h2{font-size:28px;margin-bottom:15px}.lesson-content .related-links{margin-bottom:0}
@media(max-width:900px){.lesson-layout{grid-template-columns:1fr;gap:20px}.lesson-toc{position:static;display:flex;flex-direction:row;flex-wrap:wrap;gap:0 20px}.lesson-toc strong{width:100%}.lesson-content>section{margin-bottom:35px}}
@media(max-width:650px){.lesson-playground{padding:15px}.editor-label-row{flex-direction:column;gap:3px}.lesson-playground textarea{font-size:16px;padding:12px}.lesson-playground iframe{height:430px}.lesson-playground .button-row{flex-direction:column}.lesson-toc{gap:0 15px}.lesson-source pre{font-size:12px}}

.lesson-code{white-space:pre-wrap;overflow-wrap:anywhere;padding:18px;background:var(--tint);border:1px solid var(--line);border-radius:8px;font-size:13px;line-height:1.7}