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span{background:var(--c-brand);border-radius:inherit;height:100%;transition:width var(--dur-slow)var(--ease);display:block}.meter-text{font-size:var(--fs-sm);color:var(--c-text-2);font-variant-numeric:tabular-nums;font-weight:600}.tracks{gap:var(--sp-8);scroll-margin-top:var(--anchor-offset);flex-direction:column;display:flex}.track{gap:var(--sp-5);display:grid}.track-head{gap:var(--sp-2);flex-direction:column;display:flex}.track-head h2{font-size:var(--fs-xl);font-weight:800}.course-row{gap:var(--sp-4);padding:var(--sp-5)var(--sp-2);border-top:1px solid var(--c-border);color:var(--c-text);transition:background-color var(--dur)var(--ease);grid-template-columns:auto 1fr auto;align-items:start;text-decoration:none;display:grid}.course-rows li:last-child .course-row{border-bottom:1px solid var(--c-border)}.course-row:hover{box-shadow:var(--shadow-rest);background:var(--c-surface-2)}.course-row:active{background:var(--c-surface-3)}.course-row:hover 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var(--c-border);max-width:var(--list-max)}.lesson-list a{padding-block:var(--sp-4)}.lesson-name{font-weight:600;line-height:1.35}.lesson-meta{align-items:center;gap:var(--sp-3);font-size:var(--fs-sm);color:var(--c-text-2);white-space:nowrap;display:inline-flex}.tag{align-items:center;gap:var(--sp-1);padding:var(--sp-half)var(--sp-2);border-radius:var(--r-pill);background:var(--c-surface-2);color:var(--c-ink);font-weight:600;display:inline-flex}.lesson-head{gap:var(--sp-3);padding-block:var(--sp-5)var(--sp-6);flex-direction:column;display:flex}.lesson-count{align-items:center;gap:var(--sp-2);font-size:var(--fs-sm);color:var(--c-text-2);font-weight:600;display:inline-flex}.lesson-grid{gap:var(--sp-6);display:grid}.lesson-video video{width:100%;max-width:var(--phone-w);aspect-ratio:9/16;width:auto;height:var(--video-h);object-fit:cover;background:var(--c-text);border-radius:var(--r-lg);margin-inline:auto;display:block}.lesson-main{gap:var(--sp-7);min-width:0;max-width:var(--measure);flex-direction:column;display:flex}.prose{font-size:var(--fs-md);line-height:1.7}.prose>*+*{margin-top:var(--sp-4)}.prose h2{font-size:var(--fs-lg);margin-top:var(--sp-6);font-weight:700}.prose ul,.prose ol{padding-left:var(--sp-5)}.prose li+li{margin-top:var(--sp-2)}.prose li::marker{color:var(--c-ink);font-weight:700}.prose strong{font-weight:700}.takeaways{background:var(--c-surface-2);border-radius:var(--r-lg);padding:var(--sp-5)}.takeaways h2,.quiz h2{font-size:var(--fs-lg);font-weight:700}.takeaways ul{margin:var(--sp-4)0 0;gap:var(--sp-3);padding:0;list-style:none;display:grid}.takeaways li{gap:var(--sp-3);align-items:flex-start;display:flex}.takeaways li svg{margin-top:var(--nudge);color:var(--c-ink)}.quiz{gap:var(--sp-5);flex-direction:column;display:flex}.quiz-q{border:1px solid var(--c-border);border-radius:var(--r-lg);padding:var(--sp-5);gap:var(--sp-2);background:var(--c-surface);margin:0;display:grid}.quiz-q legend{float:left;width:100%;margin-bottom:var(--sp-3);padding:0;font-weight:700}.quiz-opt{align-items:center;gap:var(--sp-3);min-height:var(--hit-lg);padding:var(--sp-2)var(--sp-4);border:1px solid var(--c-border);border-radius:var(--r-md);cursor:pointer;transition:background-color var(--dur)var(--ease),border-color var(--dur)var(--ease);display:flex}.quiz-opt:hover{background:var(--c-surface-2);border-color:var(--c-border-strong)}.quiz-opt:not(.right):not(.wrong):has(input:checked){border-color:var(--c-ink);background:var(--c-surface-2)}.quiz-opt:has(input:focus-visible){outline:var(--focus-w)solid var(--c-focus);outline-offset:var(--sp-half)}.quiz-opt input{accent-color:var(--c-ink);width:var(--check);height:var(--check);margin:0}.quiz-opt>span{flex:1}.quiz-opt.right{border-color:var(--c-success);background:var(--c-success-bg);color:var(--c-success);font-weight:600}.quiz-opt.wrong{border-color:var(--c-error);background:var(--c-error-bg);color:var(--c-error);font-weight:600}.quiz-q:disabled .quiz-opt{cursor:default}.quiz-foot{align-items:center;gap:var(--sp-3)var(--sp-4);flex-wrap:wrap;display:flex}.quiz-msg{align-items:center;gap:var(--sp-2);font-weight:600;display:inline-flex}.quiz-msg.ok{color:var(--c-success)}.quiz-msg.bad{color:var(--c-error)}.pager{gap:var(--sp-3);padding-top:var(--sp-6);border-top:1px solid var(--c-border);display:grid}.pager a{gap:var(--sp-1);padding:var(--sp-4);border:1px solid var(--c-border);border-radius:var(--r-md);color:var(--c-text);transition:background-color var(--dur)var(--ease),border-color var(--dur)var(--ease);flex-direction:column;text-decoration:none;display:flex}.pager a:hover{box-shadow:var(--shadow-rest);background:var(--c-surface-2);border-color:var(--c-border-strong)}.pager a:active{background:var(--c-surface-3)}.pager small{font-size:var(--fs-sm);color:var(--c-text-2)}.pager a span{align-items:center;gap:var(--sp-1);font-weight:700;display:inline-flex}.pager-next{text-align:right;align-items:flex-end}.pager a.pager-next{background:var(--c-ink);border-color:var(--c-ink);color:var(--c-on-ink)}.pager a.pager-next small{color:var(--c-on-ink)}.pager a.pager-next:hover{background:var(--c-ink-hover);border-color:var(--c-ink-hover)}.pager a.pager-next:active{background:var(--c-ink-active)}@media (min-width:640px){.wrap{padding-inline:var(--sp-5)}.hide-sm{display:inline-flex}.footer-row{flex-direction:row;justify-content:space-between}.glossary-grid{column-gap:var(--sp-6);grid-template-columns:1fr 1fr}.pager{grid-template-columns:1fr 1fr}.lesson-list a,.start-list a{grid-template-columns:auto 1fr auto auto}.lesson-list .lesson-meta,.start-list .start-min,.start-list .status-done,.lesson-list .status-done{grid-area:auto}}@media (min-width:960px){.hero{padding-block:var(--sp-8)var(--sp-9);grid-template-columns:1.15fr 1fr;align-items:center}.track{grid-template-columns:var(--rail)1fr;gap:var(--sp-7);align-items:start}.track-head{top:var(--sticky-top);position:sticky}.glossary{grid-template-columns:var(--rail)1fr;gap:var(--sp-7);align-items:start}.glossary .track-head{position:static}.lesson-grid.has-video{grid-template-columns:minmax(0,var(--measure))var(--rail);gap:var(--sp-8);align-items:start}.lesson-grid.has-video .lesson-video video{border-radius:var(--phone-r);border:var(--phone-bezel)solid var(--c-text);width:100%;height:auto;box-shadow:var(--shadow-lift)}.lesson-grid.has-video .lesson-video{top:var(--sticky-top);order:2;position:sticky}}