:root{--lc-bg:#1c1c22;--lc-bg-elevated:#23242d;--lc-border:#343647;--lc-text:#f4f7fb;--lc-text-muted:#a0a6b8;--lc-text-soft:#c4cad8;--lc-accent:#20c7f3;--lc-danger:#e71d36}.lesson-content{color:var(--lc-text);font-family:Space Grotesk,system-ui,sans-serif;font-size:18px;line-height:1.7}.lesson-content h2{color:var(--lc-text);margin:2.25rem 0 .75rem;font-family:Space Grotesk,system-ui,sans-serif;font-size:1.3rem;font-weight:700}.lesson-content h3{color:var(--lc-text);margin:1.5rem 0 .5rem;font-family:Space Grotesk,system-ui,sans-serif;font-size:1.05rem;font-weight:700}.lesson-content p{color:var(--lc-text);margin:0 0 1.1rem}.lesson-content a{color:var(--lc-accent);text-underline-offset:2px;text-decoration:underline #20c7f373;transition:text-decoration-color .15s}.lesson-content a:hover{text-decoration-color:var(--lc-accent)}.lesson-content strong{color:var(--lc-text)}.lesson-content em{color:var(--lc-text-soft)}.lesson-content code,.lesson-content pre{font-family:JetBrains 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0;padding:1rem 1.25rem;font-size:.96rem}.lesson-content aside.callout .label{letter-spacing:.16em;text-transform:uppercase;color:var(--lc-accent);margin-bottom:.4rem;font-family:JetBrains Mono,ui-monospace,monospace;font-size:11px;display:block}.lesson-content aside.callout a{color:var(--lc-accent)}.lesson-content details{background:var(--lc-bg-elevated);border:1px solid var(--lc-border);cursor:pointer;color:var(--lc-text);border-radius:8px;margin:1rem 0;padding:.75rem 1rem}.lesson-content details summary{color:var(--lc-accent);font-family:JetBrains Mono,ui-monospace,monospace;font-size:.9rem;font-weight:600}.lesson-content details[open] summary{margin-bottom:.5rem}.lesson-content details p{color:var(--lc-text-soft);font-size:.95rem}.lesson-content .quiz{background:var(--lc-bg-elevated);border:1px solid var(--lc-border);border-radius:8px;margin:1.5rem 0;padding:1.25rem}.lesson-content .quiz .q{color:var(--lc-text);margin:0 0 .75rem;font-size:1rem;font-weight:600}.lesson-content .quiz 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