.lesson-content{font-family:Space Grotesk,system-ui,sans-serif;font-size:18px;line-height:1.7;color:#f4f7fb}.lesson-content header.masthead{border-bottom:1px solid #343647;padding-bottom:1.5rem;margin-bottom:2rem}.lesson-content .kicker{font-family:JetBrains Mono,ui-monospace,monospace;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:#20c7f3;margin:0 0 .5rem}.lesson-content h1{font-family:Space Grotesk,system-ui,sans-serif;font-size:1.8rem;line-height:1.15;font-weight:700;margin:0 0 .5rem;color:#f4f7fb}.lesson-content .subtitle{color:#a0a6b8;font-size:1.05rem;margin:0}.lesson-content h2{font-family:Space Grotesk,system-ui,sans-serif;font-size:1.3rem;font-weight:700;margin:2.25rem 0 .75rem;color:#f4f7fb}.lesson-content h3{font-family:Space Grotesk,system-ui,sans-serif;font-size:1.05rem;font-weight:700;margin:1.5rem 0 .5rem;color:#f4f7fb}.lesson-content p{margin:0 0 1.1rem;color:#f4f7fb}.lesson-content a{color:#20c7f3;text-decoration:none;border-bottom:1px solid transparent;transition:border-color .15s ease}.lesson-content a:hover{border-bottom-color:#20c7f3}.lesson-content strong{color:#f4f7fb}.lesson-content em{color:#c4cad8}.lesson-content code,.lesson-content pre{font-family:JetBrains Mono,ui-monospace,monospace;font-size:.88em}.lesson-content code{background:#23242d;color:#20c7f3;padding:.1em .4em;border-radius:4px;border:1px solid #343647}.lesson-content pre{background:#161619;border:1px solid #343647;padding:1rem 1.25rem;border-radius:8px;overflow-x:auto;line-height:1.6;color:#f4f7fb}.lesson-content pre code{background:none;padding:0;border:none;color:inherit}.lesson-content blockquote{margin:1.5rem 0;padding:.5rem 0 .5rem 1.25rem;border-left:3px solid #20c7f3;color:#a0a6b8;font-style:italic}.lesson-content ul,.lesson-content ol{padding-left:1.25rem;color:#f4f7fb}.lesson-content li{margin-bottom:.4rem}.lesson-content li::marker{color:#20c7f3}.lesson-content .diagram{background:#fbf9f4;border:1px solid #343647;border-radius:8px;padding:1.25rem;margin:1.5rem 0;text-align:center}.lesson-content .diagram svg{max-width:100%;height:auto}.lesson-content aside.callout{background:#23242d;border:1px solid #343647;border-left:3px solid #20c7f3;border-radius:8px;padding:1rem 1.25rem;margin:1.5rem 0;font-size:.96rem;color:#c4cad8}.lesson-content aside.callout .label{font-family:JetBrains Mono,ui-monospace,monospace;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#20c7f3;display:block;margin-bottom:.4rem}.lesson-content aside.callout a{color:#20c7f3}.lesson-content details{margin:1rem 0;padding:.75rem 1rem;background:#23242d;border:1px solid #343647;border-radius:8px;cursor:pointer;color:#f4f7fb}.lesson-content details summary{font-weight:600;color:#20c7f3;font-family:JetBrains Mono,ui-monospace,monospace;font-size:.9rem}.lesson-content details[open] summary{margin-bottom:.5rem}.lesson-content details p{color:#c4cad8;font-size:.95rem}.lesson-content .quiz{margin:1.5rem 0;padding:1.25rem;background:#23242d;border:1px solid #343647;border-radius:8px}.lesson-content .quiz .q{font-weight:600;margin:0 0 .75rem;color:#f4f7fb;font-size:1rem}.lesson-content .quiz .options{display:flex;flex-direction:column;gap:.5rem}.lesson-content .quiz button{text-align:left;padding:.6rem .85rem;background:#1c1c22;border:1px solid #343647;border-radius:6px;cursor:pointer;font-family:Space Grotesk,system-ui,sans-serif;font-size:.95rem;color:#c4cad8;transition:border-color .15s ease,background .15s ease,color .15s ease}.lesson-content .quiz button:hover{border-color:#20c7f3;color:#f4f7fb}.lesson-content .quiz button.correct{background:#20c7f31f;border-color:#20c7f3;color:#f4f7fb}.lesson-content .quiz button.wrong{background:#e71d3626;border-color:#e71d36;color:#f4f7fb}.lesson-content .quiz .feedback{margin-top:.75rem;font-size:.92rem;color:#a0a6b8;min-height:1.2em}.lesson-content .quiz .feedback strong{color:#20c7f3}.lesson-content .prompt{background:linear-gradient(135deg,#20c7f314,#70a7ed0d);border:1px solid #343647;border-left:3px solid #20c7f3;border-radius:8px;padding:1.25rem 1.5rem;margin:2rem 0 0;font-size:.96rem;color:#f4f7fb}.lesson-content .prompt .label{font-family:JetBrains Mono,ui-monospace,monospace;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#20c7f3;display:block;margin-bottom:.4rem}.lesson-content footer.foot{margin-top:2.5rem;padding-top:1.25rem;border-top:1px solid #343647;font-size:.9rem;color:#a0a6b8}.lesson-content footer.foot a{color:#a0a6b8;border-bottom:1px dotted #a0a6b8}