.pl,.pl-curr-list,.pl-curr-h,.pl-finished{--pl-bg:#fff;--pl-bg2:#f6f7f9;--pl-card:#fff;--pl-ink:#17191e;--pl-2:#3a3f4a;--pl-3:#5b6270;--pl-line:#e2e4e9;--pl-line2:#cfd3da;--pl-accent:#1849b8;--pl-accent-ink:#fff;--pl-soft:#eef3ff;--pl-ok:#0a6344;--pl-ok-soft:#e8f6ef;--pl-bad:#a3242a;--pl-bad-soft:#fcf0f1;--pl-shadow:0 -6px 24px -12px #10182840}:root[data-theme=dark] .pl,:root[data-theme=dark] .pl-curr-list,:root[data-theme=dark] .pl-curr-h,:root[data-theme=dark] .pl-finished{--pl-bg:#0a0a0a;--pl-bg2:#141619;--pl-card:#111214;--pl-ink:#f2f3f5;--pl-2:#c6cad2;--pl-3:#a3abb8;--pl-line:#26292f;--pl-line2:#343842;--pl-accent:#8fb0ff;--pl-accent-ink:#0b0d10;--pl-soft:#111a33;--pl-ok:#5fd3a2;--pl-ok-soft:#0f2a20;--pl-bad:#ff9a9a;--pl-bad-soft:#2d1416;--pl-shadow:0 -6px 24px -12px #000c}:root[data-surface=portal][data-theme=dark] .pl{--pl-bg:#0d0f12}.cx>.cx-sec.pl-sec{padding-top:40px;padding-bottom:0}@media (width<=640px){.cx>.cx-sec.pl-sec{padding-top:20px}}.pl{max-width:1240px;color:var(--pl-2);margin:0 auto 80px}.pl .sr-only,.pl-curr-list .sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.pl a{color:var(--pl-accent)}.pl svg{flex:none;width:18px;height:18px}.pl :focus-visible{outline:2px solid var(--pl-accent);outline-offset:2px}.pl-head{border-bottom:1px solid var(--pl-line);padding-bottom:20px}.pl-head-top{flex-wrap:wrap;align-items:center;gap:10px 20px;display:flex}.pl-back{align-items:center;gap:6px;min-height:44px;font-size:15px;font-weight:600;text-decoration:none;display:inline-flex}.pl-back:hover{text-decoration:underline}.pl-course{color:var(--pl-2);flex:260px;margin:0;font-size:15px}.pl-code{background:var(--pl-soft);color:var(--pl-accent);border-radius:6px;margin-right:6px;padding:2px 8px;font-size:14px;font-weight:700;display:inline-block}.pl-prog{align-items:center;gap:10px;min-width:200px;display:flex}progress.pl-prog-bar{-webkit-appearance:none;appearance:none;background:var(--pl-line);width:140px;height:8px;color:var(--pl-accent);border:0;border-radius:999px;overflow:hidden}progress.pl-prog-bar::-webkit-progress-bar{background:var(--pl-line);border-radius:999px}progress.pl-prog-bar::-webkit-progress-value{background:var(--pl-accent);border-radius:999px}progress.pl-prog-bar::-moz-progress-bar{background:var(--pl-accent);border-radius:999px}.pl-prog-l{color:var(--pl-2);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:14px;font-weight:600}.pl-k{color:var(--pl-accent);margin:14px 0 0;font-size:15px;font-weight:600}.pl .pl-h1,.cx .pl .pl-h1{letter-spacing:-.02em;color:var(--pl-ink);margin:4px 0 0;font-size:clamp(28px,2.4vw + 14px,40px);font-weight:650;line-height:1.15}.pl-device{color:var(--pl-2);margin:10px 0 0;font-size:15px}.pl-grid{grid-template-columns:minmax(0,1fr);gap:20px;margin-top:20px;display:grid}.pl-side{border:1px solid var(--pl-line);background:var(--pl-bg2);border-radius:12px}.pl-side-sum{cursor:pointer;min-height:48px;color:var(--pl-ink);align-items:center;gap:10px;padding:0 14px;font-size:16px;font-weight:700;list-style:none;display:flex}.pl-side-sum::-webkit-details-marker{display:none}.pl-side-t{flex:1}.pl-side-c{color:var(--pl-3);font-size:14px;font-weight:600}.pl-side-chev{transition:transform .15s;display:inline-flex}.pl-side[open] .pl-side-chev{transform:rotate(180deg)}.pl-side-nav{padding:0 6px 8px}@media (width>=960px){.pl-grid{grid-template-columns:300px minmax(0,1fr);align-items:start;gap:36px}.pl-grid:has(>.pl-side:not([open])){grid-template-columns:200px minmax(0,1fr)}.pl-side{max-height:calc(100vh - 120px);position:sticky;top:16px;overflow:auto}}@media (prefers-reduced-motion:reduce){.pl-side-chev{transition:none}}.pl-curr-list{gap:2px;margin:0;padding:0;list-style:none;display:grid}.pl-row a{color:var(--pl-ink);border-radius:8px;grid-template-columns:28px minmax(0,1fr);gap:10px;padding:10px 8px;text-decoration:none;display:grid}.pl-row a:hover{background:var(--pl-card)}.pl-row a:focus-visible{outline:2px solid var(--pl-accent);outline-offset:-2px}.pl-row.is-current a{background:var(--pl-soft);box-shadow:inset 3px 0 0 var(--pl-accent)}.pl-row-n{border:1.5px solid var(--pl-line2);width:26px;height:26px;color:var(--pl-3);font-variant-numeric:tabular-nums;border-radius:50%;place-items:center;font-size:14px;font-weight:700;display:inline-grid}.pl-row-tick{display:none}.pl-row-tick svg{width:15px;height:15px}.pl-row.is-done .pl-row-n{background:var(--pl-ok);border-color:var(--pl-ok);color:var(--pl-bg)}.pl-row.is-done .pl-row-num{display:none}.pl-row.is-done .pl-row-tick{display:inline-flex}.pl-row-body{gap:3px;min-width:0;display:grid}.pl-row-t{font-size:15px;font-weight:600;line-height:1.35}.pl-row.is-current .pl-row-t{color:var(--pl-accent)}.pl-row-x{color:var(--pl-2);font-size:15px;line-height:1.5}.pl-row-m{color:var(--pl-3);flex-wrap:wrap;gap:2px 12px;font-size:14px;display:flex}.pl-row-m>span:empty{display:none}.pl-row-form{align-items:center;gap:5px;display:inline-flex}.pl-row-form svg{width:14px;height:14px}.pl-row-state{color:var(--pl-ok);font-weight:600}.pl-curr-list.is-full{border-top:1px solid var(--pl-line);gap:0}.pl-curr-list.is-full .pl-row{border-bottom:1px solid var(--pl-line)}.pl-curr-list.is-full .pl-row a{grid-template-columns:36px minmax(0,1fr);gap:14px;padding:16px 8px}.pl-curr-list.is-full .pl-row-n{width:32px;height:32px;font-size:15px}.pl-curr-list.is-full .pl-row-t{color:var(--pl-accent);font-size:17px}.pl-curr-h{color:var(--pl-ink);margin:32px 0 12px;font-size:20px}.pl-main{min-width:0;max-width:900px}.pl-media{margin:0}.pl-frame{aspect-ratio:16/9;background:#000;border-radius:14px;overflow:hidden}.pl-frame video{object-fit:contain;background:#000;width:100%;height:100%;display:block}.pl-media-cap{color:var(--pl-3);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px;margin-top:10px;font-size:14px;line-height:1.5;display:flex}.pl-media-cap>span:first-child{flex:320px}.pl-watch{flex-wrap:wrap;align-items:center;gap:10px;display:inline-flex}.pl-watch-state{color:var(--pl-3);font-weight:600}.pl-watch-state.is-done{color:var(--pl-ok)}.pl-sim .lesson-exercise{margin-top:0}.pl-poster{aspect-ratio:16/9;background:radial-gradient(120% 90% at 85% 10%,#1d3f8f 0%,#101826 60%);border-radius:14px;position:relative;overflow:hidden}.pl-poster-code{letter-spacing:-.05em;color:#ffffff14;font-size:clamp(90px,16vw,220px);font-weight:800;line-height:1;position:absolute;top:2%;right:4%}.pl-poster img{object-fit:cover;opacity:.22;filter:grayscale(.4);width:100%;height:100%;position:absolute;inset:0}.pl-poster-in{color:#fff;background:linear-gradient(#0a0e1859,#0a0e18eb);align-content:end;gap:8px;padding:clamp(16px,4vw,36px);display:grid;position:absolute;inset:0}.pl-chip{color:#1a1d24;background:#fff;border-radius:999px;justify-self:start;align-items:center;gap:6px;padding:4px 10px;font-size:14px;font-weight:700;display:inline-flex}.pl-chip svg{width:15px;height:15px}.pl .pl-poster-t{letter-spacing:-.015em;color:#fff;margin:0;font-size:clamp(22px,2.4vw + 10px,36px);font-weight:700;line-height:1.15}.pl-poster-m{color:#e3e7ef;max-width:60ch;margin:0;font-size:15px}.pl-warm:empty{display:none}.pl-warm{margin-top:16px}.pl-sum{color:var(--pl-2);max-width:70ch;margin:20px 0 0;font-size:17px;line-height:1.55}.pl-tabs{border-bottom:1px solid var(--pl-line);gap:4px;margin-top:24px;display:flex;overflow-x:auto}.pl-tabs[hidden]{display:none}.pl-tabs [role=tab]{min-height:46px;color:var(--pl-2);font:inherit;cursor:pointer;white-space:nowrap;background:0 0;border:0;border-bottom:3px solid #0000;padding:0 16px;font-size:16px;font-weight:600}.pl-tabs [role=tab][aria-selected=true]{color:var(--pl-ink);border-bottom-color:var(--pl-accent)}.pl-tabs [role=tab]:hover{color:var(--pl-ink)}.pl-tabs [role=tab]:focus-visible{outline-offset:-3px}.pl-panel{margin-top:28px}.pl-panel[hidden]{display:none}.pl-panel:focus-visible{outline:2px solid var(--pl-accent);outline-offset:6px;border-radius:4px}.pl .pl-panel-h{color:var(--pl-ink);margin:0 0 16px;font-size:24px}.pl.is-tabbed .pl-panel-h{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.pl.is-tabbed .pl-panel{margin-top:20px}.pl-step+.pl-step{border-top:1px solid var(--pl-line);margin-top:36px;padding-top:28px}.pl-steps.is-stepped .pl-step+.pl-step{border-top:0;margin-top:0;padding-top:0}.pl-step[hidden]{display:none}.pl-step-k{letter-spacing:.02em;color:var(--pl-3);text-transform:uppercase;margin:0;font-size:14px;font-weight:700}.pl .pl-step h3{color:var(--pl-ink);margin:6px 0 12px;font-size:clamp(21px,1.4vw + 12px,26px);line-height:1.25}.pl-step h3:focus{outline:none}.pl-prose{color:var(--pl-ink);font-size:18px;line-height:1.65}.pl-prose p,.pl-prose ul,.pl-prose ol,.pl-prose blockquote{max-width:68ch;margin:0 0 16px}.pl-prose li{margin:6px 0}.pl .pl-prose h4{color:var(--pl-ink);margin:24px 0 8px;font-size:19px}.pl-prose code{overflow-wrap:anywhere;font-size:max(14px,.9em)}.pl-prose blockquote{border-left:4px solid var(--pl-line2);background:var(--pl-bg2);border-radius:0 10px 10px 0;padding:12px 18px}.pl-prose blockquote p:last-child{margin-bottom:0}.pl-prose blockquote.pl-pull{border-left-color:var(--pl-accent);background:var(--pl-soft);font-size:20px;font-weight:600;line-height:1.5}.pl-prose blockquote.pl-pull strong{letter-spacing:.04em;text-transform:uppercase;color:var(--pl-accent);font-size:14px;display:block}.pl-steps-nav{border-top:1px solid var(--pl-line);flex-wrap:wrap;align-items:center;gap:10px 14px;margin-top:24px;padding-top:16px;display:flex}.pl-steps-nav[hidden]{display:none}.pl-steps-count{color:var(--pl-2);font-variant-numeric:tabular-nums;font-size:15px;font-weight:700}.pl-link{min-height:44px;color:var(--pl-accent);font:inherit;cursor:pointer;background:0 0;border:0;margin-left:auto;padding:0 4px;font-size:15px;font-weight:600;text-decoration:underline}.pl-sources{border-top:1px solid var(--pl-line);color:var(--pl-2);margin-top:36px;padding-top:16px;font-size:14px;line-height:1.5}.pl .pl-sources h3{letter-spacing:.04em;text-transform:uppercase;color:var(--pl-3);margin:0 0 8px;font-size:14px}.pl-sources ul,.pl-sources ol{gap:4px;margin:0;padding-left:20px;display:grid}.pl-try{border:1px solid var(--pl-line2);background:var(--pl-card);border-radius:12px;max-width:68ch;margin:20px 0;padding:16px 18px}.pl-try fieldset{border:0;min-width:0;margin:0;padding:0}.pl-try legend{color:var(--pl-ink);padding:0;font-size:17px;font-weight:600;line-height:1.45}.pl-try-k{background:var(--pl-soft);color:var(--pl-accent);border-radius:6px;margin-right:6px;padding:2px 8px;font-size:14px;font-weight:700;display:inline-block}.pl-try-opts{gap:8px;margin-top:12px;display:grid}.pl-try-opt,.pl-opt{box-sizing:border-box;border:1px solid var(--pl-line2);background:var(--pl-bg);min-height:44px;color:var(--pl-ink);cursor:pointer;border-radius:10px;align-items:flex-start;gap:10px;padding:10px 12px;font-size:16px;line-height:1.45;display:flex}.pl-try-opt input,.pl-opt input{accent-color:var(--pl-accent);flex:none;margin-top:4px}.pl-try-opt:hover,.pl-opt:hover{border-color:var(--pl-accent)}.pl-try-opt.is-right,.pl-opt.is-right{border-color:var(--pl-ok);box-shadow:inset 4px 0 0 var(--pl-ok);background:var(--pl-ok-soft)}.pl-try-opt.is-wrong,.pl-opt.is-wrong{border-color:var(--pl-bad);box-shadow:inset 4px 0 0 var(--pl-bad);background:var(--pl-bad-soft)}.pl-try-fb{margin:10px 0 0;font-size:15px;font-weight:600;line-height:1.5}.pl-try-fb:empty{display:none}.pl-try-fb.is-right{color:var(--pl-ok)}.pl-try-fb.is-wrong{color:var(--pl-bad)}.pl-try-why{margin-top:8px;font-size:15px}.pl-try-why summary{cursor:pointer;min-height:44px;color:var(--pl-accent);align-items:center;font-weight:600;display:inline-flex}.pl-try-why p{color:var(--pl-2);margin:4px 0 0}.pl-try.is-answered .pl-try-why{display:none}.pl-task{background:var(--pl-soft);border:1px solid var(--pl-line);border-radius:14px;padding:20px 22px}.pl-task-k{color:var(--pl-accent);align-items:center;gap:8px;margin:0 0 10px;font-size:15px;font-weight:700;display:flex}.pl-checklist{gap:8px;max-width:70ch;margin:8px 0 0;padding:0;list-style:none;display:grid}.pl-checklist li{background:var(--pl-card);border:1px solid var(--pl-line);border-radius:10px;align-items:flex-start;gap:12px;padding:12px 14px;display:flex}.pl-checklist input{width:20px;height:20px;accent-color:var(--pl-ok);flex:none;margin-top:3px}.pl-checklist label{color:var(--pl-ink);cursor:pointer;font-size:17px;line-height:1.5}.pl-checklist input:checked+label{color:var(--pl-2);text-decoration:line-through;text-decoration-color:var(--pl-3)}.pl-task-count{color:var(--pl-2);margin:12px 0 0;font-size:15px;font-weight:600}.pl-task-count:empty{display:none}.pl-quiz-lead{color:var(--pl-2);margin:0;font-size:16px}.pl-q{border:0;min-width:0;margin:20px 0 0;padding:0}.pl-q legend{color:var(--pl-ink);padding:0;font-size:17px;font-weight:600;line-height:1.5}.pl-opts{gap:8px;max-width:70ch;margin-top:10px;display:grid}.pl-fb{color:var(--pl-2);margin:10px 0 0;font-size:15px;line-height:1.5}.pl-fb.is-right strong{color:var(--pl-ok)}.pl-fb.is-wrong strong{color:var(--pl-bad)}.pl-result{background:var(--pl-soft);color:var(--pl-ink);border-radius:10px;margin:16px 0 0;padding:12px 14px;font-size:16px}.pl-actions{flex-wrap:wrap;align-items:center;gap:12px 16px;margin-top:20px;display:flex}.pl-best{color:var(--pl-2);font-size:15px}.pl-answers{color:var(--pl-2);margin-top:18px;font-size:15px}.pl-answers summary{cursor:pointer;min-height:44px;color:var(--pl-accent);align-items:center;font-weight:600;display:inline-flex}.pl-note{color:var(--pl-2);margin:0 0 12px;font-size:15px}.pl-cues{gap:10px;max-width:72ch;margin:0;padding:0;list-style:none;display:grid}.pl-cues li{color:var(--pl-ink);grid-template-columns:64px minmax(0,1fr);align-items:baseline;gap:12px;font-size:17px;line-height:1.55;display:grid}span.pl-cue-t,button.pl-cue-t{color:var(--pl-accent);font-variant-numeric:tabular-nums;font-size:14px;font-weight:700}button.pl-cue-t{border:1px solid var(--pl-line2);cursor:pointer;background:0 0;border-radius:6px;min-height:32px;padding:0 8px;font-family:inherit}.pl-finished{background:var(--pl-ok-soft,#e8f6ef);color:var(--pl-ink,#17191e);border-radius:10px;margin:20px 0 0;padding:12px 14px;font-size:16px;font-weight:600}.pl-finished[hidden]{display:none}.pl-btn{border:1px solid var(--pl-line2);background:var(--pl-card);min-height:44px;color:var(--pl-ink);font:inherit;cursor:pointer;white-space:nowrap;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-size:15px;font-weight:600;line-height:1;text-decoration:none;display:inline-flex}.pl a.pl-btn{color:var(--pl-ink)}.pl-btn:hover{border-color:var(--pl-accent)}.pl-btn:disabled{opacity:.55;cursor:default}.pl-btn-p,.pl a.pl-btn-p{background:var(--pl-accent);border-color:var(--pl-accent);color:var(--pl-accent-ink)}.pl-btn-p:hover{filter:brightness(1.08)}.pl-btn-done.is-done{background:var(--pl-ok-soft);border-color:var(--pl-ok);color:var(--pl-ok);cursor:default}html:has(.pl-bar){scroll-padding-bottom:96px}.pl-bar{z-index:20;background:var(--pl-bg);border-top:1px solid var(--pl-line);box-shadow:var(--pl-shadow);margin-top:48px;padding:12px 0;position:sticky;bottom:0}.pl-bar-in{grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;display:grid}.pl-bar-side.is-end{justify-self:end}.pl-bar-mid{align-items:center;gap:12px;display:flex}.pl-bar-mid form{margin:0}.pl-bar-link{align-items:center;gap:4px;min-height:44px;font-size:15px;font-weight:600;text-decoration:none;display:inline-flex}.pl-bar-link:hover{text-decoration:underline}.pl-done-status{color:var(--pl-ok);font-size:14px;font-weight:600}.pl-done-status:empty{display:none}.pl-done-on{font-weight:400}@media (width<=640px){.pl-bar{padding:10px 0}.pl-bar-in{grid-template-columns:auto 1fr auto;gap:8px}.pl-bar-mid{justify-content:center}.pl-bar-lt{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.pl-bar-link{justify-content:center;min-width:44px}.pl-bar-link svg{width:22px;height:22px}.pl-btn{padding:0 14px}.pl-done-on,.pl-done-status{display:none}.pl-prose{font-size:17px}.pl-task{padding:16px 14px}.pl-prog{min-width:0}progress.pl-prog-bar{width:96px}}