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summary{margin-bottom:18px}.lesson-pagination{border-top:1px solid var(--line);grid-template-columns:1fr 1fr;gap:16px;margin-top:45px;padding-top:25px;display:grid}.lesson-pagination a{border:1px solid var(--line);border-radius:9px;flex-direction:column;gap:8px;min-width:0;padding:16px 18px;display:flex}.lesson-pagination a:hover{background:#1b2a22;border-color:#60856d}.lesson-pagination span{color:var(--muted);font-size:11px}.lesson-pagination strong{font-size:13px;font-weight:500;line-height:1.5}.next-lesson{text-align:right}.reader-toc{padding-top:38px}.reader-toc .eyebrow{margin-bottom:17px;font-size:10px}.reader-toc a{color:#99acad;margin:0 0 12px;font-size:11px;line-height:1.65;display:block}.reader-toc a:hover{color:var(--accent)}.reader-toc .toc-level-3{padding-left:12px;font-size:10px}.reader-toc .toc-level-4{padding-left:20px;font-size:10px}.reader-toc .toc-top{border-top:1px solid var(--line);color:#c3d4ce;margin-top:25px;padding-top:17px}.mobile-course-nav{display:none}@media (width>=1440px){.reader-shell{grid-template-columns:270px minmax(0,1fr) 200px;gap:48px;padding:0 48px}}@media (width<=1199px){.reader-shell{grid-template-columns:235px minmax(0,1fr);gap:28px;padding:0 28px}.reader-toc{display:none}.site-footer{margin:0 28px}.course-intro{gap:35px}}@media (width<=767px){.site-header{height:77px;padding:0 20px}.brand-symbol{width:35px;height:35px;font-size:19px}.brand strong{font-size:13px}.brand{gap:9px;font-size:10px}.header-link{font-size:12px}.header-link span{margin-left:6px}.catalog-shell,.program-shell{padding:0 20px 50px}.catalog-intro{padding:43px 0}.catalog-intro h1{margin:21px 0;font-size:39px}.intro-text{font-size:15px}.intro-meta{gap:10px 18px;font-size:11px}.course-cards,.program-modules{grid-template-columns:1fr;gap:17px}.course-card{padding:23px}.course-card h3{font-size:24px}.card-top{margin-bottom:25px}.section-heading h2{font-size:20px}.section-heading>span{font-size:11px}.site-footer{flex-direction:column;gap:5px;margin:0 20px;padding:24px 0;font-size:11px}.program-shell{padding-top:22px}.course-intro{grid-template-columns:1fr;gap:25px;padding:28px 0 35px}.course-intro h1{font-size:35px}.start-panel{grid-template-columns:45px 1fr;align-items:center;gap:15px;padding:20px;display:grid}.start-panel .course-icon{width:45px;height:45px;font-size:25px}.start-panel .primary-button,.start-panel .panel-note{grid-column:1/-1}.start-panel .panel-note{text-align:center}.program-title{margin-top:30px}.module-heading{min-height:80px;padding:18px 20px}.program-lessons a{padding:12px 20px}.reader-shell{padding:0 20px;display:block}.reader-sidebar{display:none}.mobile-course-nav{border-bottom:1px solid var(--line);padding:15px 0;font-size:12px;display:block}.mobile-course-nav>summary{cursor:pointer;color:var(--accent);justify-content:space-between;list-style:none;display:flex}.mobile-course-nav[open]>summary{padding-bottom:18px}.mobile-course-nav nav{max-height:60vh;overflow:auto}.lesson-main{padding-top:22px}.breadcrumbs{gap:8px;margin-bottom:25px;font-size:10px}.lesson-heading h1{font-size:32px}.lesson-heading{margin-bottom:25px;padding-bottom:23px}.lesson-body{font-size:14px;line-height:1.9}.lesson-body .lead{font-size:16px}.lesson-body h2{margin-top:32px;font-size:21px}.lesson-body pre{padding:17px 15px}.lesson-body pre code{font-size:11px}.lesson-body th,.lesson-body td{padding:9px 10px;font-size:11px}.lesson-body blockquote{padding:15px;font-size:13px}.lesson-pagination{gap:10px}.lesson-pagination a{padding:13px 12px}.lesson-pagination strong{font-size:12px}.lesson-pagination span,.eyebrow{font-size:10px}.course-home{padding-left:0}.lesson-link{padding:9px 10px;font-size:13px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}.lesson-body img{border-radius:8px;max-width:100%;height:auto;margin:24px 0;display:block}.lesson-body [align=center]{text-align:center}.lesson-body [align=right]{text-align:right}.nav-module{cursor:pointer;list-style:revert;padding-right:4px}.nav-group:not([open]){padding-bottom:8px}.reader-toc a.is-active{color:var(--accent);border-left:2px solid var(--accent);padding-left:8px;font-weight:600}.lesson-body .num{color:#efc37a}.code-block{min-width:0;margin:22px 0}.code-toolbar{background:#17201e;border:1px solid #2a3939;border-bottom:0;border-radius:9px 9px 0 0;flex-wrap:wrap;align-items:center;gap:10px;padding:9px 12px;font-size:11px;display:flex}.code-toolbar button,.mobile-nav-close{cursor:pointer;color:var(--accent);background:0 0;border:1px solid #45624e;border-radius:5px;padding:5px 9px}.code-toolbar button[aria-pressed=true]{background:#304c39}.code-status{color:var(--muted)}.lesson-body .code-block pre{border-radius:0 0 9px 9px;margin:0}.lesson-body pre.code-wrap code{white-space:pre-wrap;overflow-wrap:anywhere}.mobile-nav-close{display:none}@media (width<=767px){.reader-enhanced .mobile-nav-close{margin-bottom:18px;display:block}.reader-enhanced .mobile-course-nav[open]:before{content:"";z-index:59;background:#0009;position:fixed;inset:0}.reader-enhanced .mobile-course-nav[open] .mobile-nav-panel{background:var(--surface);border-right:1px solid var(--line);z-index:60;width:min(90vw,420px);height:100dvh;padding:24px 20px;position:fixed;top:0;left:0;overflow:auto}.reader-enhanced .mobile-course-nav nav{max-height:none;overflow:visible}.reader-enhanced .drawer-open{overflow:hidden}.code-toolbar{gap:8px;font-size:11px}}.header-nav{align-items:center;gap:26px;display:flex}.about-shell{max-width:1240px;margin:auto;padding:28px 48px 88px}.about-intro{border-bottom:1px solid var(--line);max-width:900px;padding:42px 0 48px}.about-intro h1{letter-spacing:-.04em;margin:20px 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