.lrn-app{--lrn-accent: var(--lrn-brand);--lrn-max: 1120px;--lrn-gutter: 16px;--lrn-header-h: 64px;min-block-size:100vh;min-block-size:100dvh;background:var(--surface);color:var(--text);font-family:var(--font-body);font-size:1rem;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}@media(prefers-color-scheme:dark){.lrn-app{--lrn-accent: var(--lrn-accent-dark)}}@media(min-width:640px){.lrn-app{--lrn-gutter: 24px}}html,body{margin:0;background:var(--surface)}*,*:before,*:after{box-sizing:border-box}.lrn-app img{max-inline-size:100%;display:block}.lrn-app a{color:inherit}.lrn-app :focus-visible{outline:3px solid var(--action);outline-offset:2px;border-radius:6px}.lrn-main:focus{outline:none}.lrn-sr{position:absolute;inline-size:1px;block-size:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}.lrn-skip{position:absolute;inset-inline-start:12px;inset-block-start:-60px;z-index:100;padding:10px 16px;border-radius:var(--r-sm);background:var(--primary);color:var(--on-primary)!important;font-weight:600;text-decoration:none}.lrn-skip:focus{inset-block-start:12px}.lrn-preview{padding:6px var(--lrn-gutter);background:var(--warn-bg);color:var(--warn);font-size:var(--t-xs);font-weight:600;text-align:center}.lrn-h1,.lrn-h2,.lrn-h3,.lrn-h4,.lrn-hero__title,.lrn-card__title{font-family:var(--font-head);color:var(--text);letter-spacing:-.01em}.lrn-h1{font-size:clamp(1.6rem,1.2rem + 1.6vw,2.25rem);line-height:1.2;font-weight:700;margin:0 0 12px}.lrn-h2{font-size:1.3rem;line-height:1.3;font-weight:600;margin:0 0 14px;display:flex;align-items:center;gap:8px}.lrn-h3{font-size:1.1rem;font-weight:600;margin:0 0 12px}.lrn-h4{font-size:1rem;font-weight:600;margin:16px 0 8px}.lrn-muted{color:var(--text-2)}.lrn-small{font-size:var(--t-sm);margin:8px 0 0}.lrn-center{text-align:center}.lrn-count{font-family:var(--font-body);font-size:var(--t-sm);font-weight:600;color:var(--text-2);background:var(--card);border:1px solid var(--line);border-radius:999px;padding:0 8px}.lrn-header{position:sticky;inset-block-start:0;z-index:30;background:color-mix(in srgb,var(--surface) 82%,transparent);backdrop-filter:saturate(1.4) blur(16px);-webkit-backdrop-filter:saturate(1.4) blur(16px);border-block-end:1px solid var(--line)}.lrn-header__inner{max-inline-size:var(--lrn-max);margin:0 auto;padding:0 var(--lrn-gutter);block-size:var(--lrn-header-h);display:flex;align-items:center;justify-content:space-between;gap:16px}.lrn-brandmark{display:flex;align-items:center;text-decoration:none;min-block-size:44px;min-inline-size:0}.lrn-brandmark__logo{max-block-size:40px;max-inline-size:180px;object-fit:contain}.lrn-brandmark__name{font-family:var(--font-head);font-weight:700;font-size:1.15rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lrn-header__nav{display:flex;align-items:center;gap:6px;flex-shrink:0}.lrn-navlink{display:inline-flex;align-items:center;gap:6px;min-block-size:44px;padding:0 12px;border-radius:var(--r-btn);text-decoration:none;font-weight:600;color:var(--text)}.lrn-navlink:hover{background:color-mix(in srgb,var(--text) 6%,transparent)}.lrn-navlink--icon{inline-size:44px;justify-content:center;padding:0}.lrn-navlink--solid{box-shadow:var(--btn-sec-shadow);background:var(--btn-sec-bg)}.lrn-page{max-inline-size:var(--lrn-max);margin:0 auto;padding:28px var(--lrn-gutter) 72px}.lrn-narrow{max-inline-size:460px}.lrn-section{margin-block:36px}.lrn-section:first-child{margin-block-start:0}.lrn-empty{text-align:center;padding-block:48px;display:grid;justify-items:center;gap:12px}.lrn-crumbs{font-size:var(--t-sm);margin-block-end:16px;color:var(--text-2)}.lrn-crumbs a{text-decoration:none}.lrn-crumbs a:hover{text-decoration:underline}.lrn-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-block-size:var(--btn-h);padding:0 20px;border:0;border-radius:var(--r-btn);font:600 1rem/1.2 var(--font-body);text-decoration:none;cursor:pointer;transition:transform var(--dur-press) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out),filter var(--dur-fast);-webkit-tap-highlight-color:transparent}.lrn-btn:active:not(:disabled){transform:translateY(1px)}.lrn-btn:disabled{opacity:.55;cursor:not-allowed}.lrn-btn[aria-busy=true]{cursor:progress}.lrn-btn--primary{background-color:var(--lrn-brand);background-image:linear-gradient(180deg,#ffffff29,#fff0 55%,#0000001f);color:var(--lrn-on-brand)!important;box-shadow:0 0 0 1px color-mix(in srgb,var(--lrn-brand) 78%,#000),inset 0 1px #ffffff3d,inset 0 -2px #00000047,0 1px 2px #0003,0 4px 10px -3px #0000004d}.lrn-btn--primary:hover:not(:disabled){filter:brightness(1.08)}.lrn-btn--primary:active:not(:disabled){box-shadow:0 0 0 1px color-mix(in srgb,var(--lrn-brand) 78%,#000),inset 0 2px 4px #0000004d}@media(prefers-color-scheme:dark){.lrn-btn--primary{box-shadow:0 0 0 1px #ffffff38,inset 0 1px #ffffff38,inset 0 -2px #0000004d,0 1px 2px #0006}}.lrn-btn--secondary{background:var(--btn-sec-bg);color:var(--text)!important;box-shadow:var(--btn-sec-shadow)}.lrn-btn--secondary:hover:not(:disabled){background:var(--btn-sec-press)}.lrn-btn--secondary:active:not(:disabled){box-shadow:var(--btn-sec-shadow-press)}.lrn-btn--sm{min-block-size:38px;padding:0 14px;font-size:var(--t-md)}.lrn-btn--lg{min-block-size:50px;font-size:1.05rem}.lrn-btn--xl{min-block-size:56px;font-size:1.1rem;padding:0 24px}.lrn-btn--block{inline-size:100%}.lrn-iconbtn{inline-size:44px;block-size:44px;display:inline-grid;place-items:center;flex-shrink:0;border:0;border-radius:50%;background:transparent;color:var(--text);cursor:pointer}.lrn-iconbtn:hover{background:color-mix(in srgb,var(--text) 8%,transparent)}.lrn-badge{display:inline-flex;align-items:center;gap:4px;padding:2px 10px;border-radius:999px;font-size:var(--t-xs);font-weight:700;line-height:1.6;background:color-mix(in srgb,var(--text) 7%,transparent);color:var(--text)}.lrn-badge--ok{background:var(--ok-bg);color:var(--ok)}.lrn-badge--warn{background:var(--warn-bg);color:var(--warn)}.lrn-badge--info{background:var(--info-bg);color:var(--info)}.lrn-alert{margin:12px 0;padding:12px 14px;border-radius:var(--r-sm);font-size:var(--t-md);line-height:1.5;display:flex;gap:8px;align-items:flex-start;background:color-mix(in srgb,var(--text) 5%,var(--card));color:var(--text);border:1px solid var(--line)}.lrn-alert--error{background:var(--danger-bg);color:var(--danger);border-color:transparent}.lrn-alert--ok{background:var(--ok-bg);color:var(--ok);border-color:transparent}.lrn-alert--warn{background:var(--warn-bg);color:var(--warn);border-color:transparent}.lrn-loading{display:flex;align-items:center;justify-content:center;gap:10px;padding:56px 16px;color:var(--text-2)}.lrn-spinner{inline-size:20px;block-size:20px;border-radius:50%;border:2.5px solid var(--line);border-block-start-color:var(--text);animation:lrn-spin .8s linear infinite}@keyframes lrn-spin{to{transform:rotate(360deg)}}.lrn-icon{flex-shrink:0}.lrn-progress{block-size:8px;border-radius:999px;overflow:hidden;inline-size:100%;background:color-mix(in srgb,var(--text) 10%,transparent)}.lrn-progress--sm{block-size:6px}.lrn-progress__fill{display:block;block-size:100%;border-radius:inherit;background:var(--lrn-accent);transition:inline-size var(--dur-slow) var(--ease-out)}.lrn-meter{display:grid;gap:8px;margin-block-end:16px}.lrn-meter__nums{display:flex;justify-content:space-between;font-size:var(--t-sm);color:var(--text-2)}.lrn-meter__nums strong{color:var(--text);font-size:1rem}.lrn-meter__pct{font-weight:700;color:var(--text)}.lrn-hero{position:relative;isolation:isolate;overflow:hidden;padding:56px var(--lrn-gutter) 48px;background:radial-gradient(120% 90% at 100% 0%,color-mix(in srgb,var(--lrn-accent) 12%,transparent),transparent 60%),var(--card);border-block-end:1px solid var(--line)}.lrn-hero__inner{max-inline-size:var(--lrn-max);margin:0 auto;display:grid;gap:12px;justify-items:start}.lrn-hero__logo{max-block-size:72px;max-inline-size:220px;object-fit:contain;margin-block-end:8px}.lrn-hero__title{font-size:clamp(2rem,1.3rem + 3vw,3.25rem);line-height:1.1;font-weight:700;margin:0;max-inline-size:18ch}.lrn-hero__sub{font-size:clamp(1.05rem,1rem + .4vw,1.3rem);color:var(--text-2);margin:0;max-inline-size:40ch}.lrn-hero--cover{min-block-size:min(62vh,520px);display:flex;align-items:flex-end;padding-block:96px 48px}.lrn-hero--cover .lrn-hero__inner{inline-size:100%}.lrn-hero__bg{position:absolute;inset:0;inline-size:100%;block-size:100%;object-fit:cover;z-index:-2;max-inline-size:none!important}.lrn-hero--cover:after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(0deg,#000000b8,#00000059 55%,#0000001a)}.lrn-hero--cover .lrn-hero__title,.lrn-hero--cover .lrn-hero__sub{color:#fff}.lrn-hero--cover .lrn-hero__sub{color:#ffffffe0}.lrn-grid{list-style:none;margin:0;padding:0;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr))}.lrn-grid>li{display:flex}.lrn-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-soft)}.lrn-card--pad{padding:24px}.lrn-card--pad>:last-child{margin-block-end:0}.lrn-card--course{inline-size:100%;overflow:hidden;display:flex;flex-direction:column;text-decoration:none;transition:transform var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out)}a.lrn-card--course:hover{transform:translateY(-2px);box-shadow:var(--sh-raised)}.lrn-card--course.is-closed{opacity:.75}.lrn-card__media{display:block;aspect-ratio:16 / 9;background:color-mix(in srgb,var(--lrn-accent) 10%,var(--card));overflow:hidden}.lrn-card__media img{inline-size:100%;block-size:100%;object-fit:cover}.lrn-card__placeholder{display:grid;place-items:center;block-size:100%;font:700 3rem/1 var(--font-head);color:color-mix(in srgb,var(--lrn-accent) 55%,var(--text-2))}.lrn-card__body{padding:16px 18px 20px;display:grid;gap:6px;align-content:start;flex:1}.lrn-card__badges{display:flex;flex-wrap:wrap;gap:6px;min-block-size:0}.lrn-card__title{font-size:1.15rem;font-weight:600;line-height:1.3;margin:2px 0 0}.lrn-card__title a{text-decoration:none}.lrn-card__title a:hover{text-decoration:underline}.lrn-card__by{margin:0;color:var(--text-2);font-size:var(--t-md)}.lrn-card__meta{margin:0;color:var(--text-2);font-size:var(--t-sm)}.lrn-card__progress{display:flex;align-items:center;gap:10px;margin-block-start:6px}.lrn-card__pct{font-size:var(--t-sm);font-weight:700;color:var(--text);white-space:nowrap}.lrn-card__cta{justify-self:start;margin-block-start:8px}.lrn-course__layout{display:grid;gap:24px;grid-template-areas:"head" "aside" "main"}.lrn-course__head{grid-area:head}.lrn-course__main{grid-area:main;min-inline-size:0}.lrn-course__aside{grid-area:aside}@media(min-width:960px){.lrn-course__layout{grid-template-columns:minmax(0,1fr) 360px;column-gap:48px;grid-template-areas:"head aside" "main aside";grid-template-rows:auto 1fr}.lrn-course__aside>*{position:sticky;inset-block-start:calc(var(--lrn-header-h) + 24px)}}.lrn-course__image{inline-size:100%;aspect-ratio:16 / 9;object-fit:cover;border-radius:var(--r-lg);margin-block-end:20px}.lrn-course__head .lrn-card__badges{margin-block-end:10px}.lrn-course__by{margin:0 0 8px;font-size:1.05rem;color:var(--text-2)}.lrn-course__meta{display:flex;flex-wrap:wrap;gap:16px;margin:0;color:var(--text-2);font-size:var(--t-md)}.lrn-course__meta span{display:inline-flex;align-items:center;gap:6px}.lrn-action{display:grid;gap:12px}.lrn-action .lrn-h3,.lrn-action .lrn-meter{margin:0}.lrn-details{margin-block:24px;padding:14px 18px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--card)}.lrn-details summary{cursor:pointer;font-weight:600;min-block-size:32px}.lrn-outline{display:grid;gap:16px}.lrn-outline__empty{padding:12px 4px}.lrn-chapter{background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}.lrn-chapter__head{margin:0;font:inherit}.lrn-chapter__head--static,.lrn-chapter__toggle{display:flex;align-items:center;gap:10px;inline-size:100%;padding:14px 16px;font-family:var(--font-head);font-weight:600;font-size:1rem;color:var(--text);background:color-mix(in srgb,var(--text) 3%,var(--card));border:0;border-block-end:1px solid var(--line);text-align:start}.lrn-chapter__toggle{cursor:pointer;min-block-size:48px}.lrn-chapter__title{flex:1;min-inline-size:0}.lrn-chapter__count{font-family:var(--font-body);font-size:var(--t-sm);font-weight:600;color:var(--text-2)}.lrn-chapter__chev{transition:transform var(--dur-fast) var(--ease-out);color:var(--text-2)}.lrn-chapter__chev:not(.is-open){transform:rotate(90deg)}.lrn-chapter__list{list-style:none;margin:0;padding:6px;display:grid;gap:2px}.lrn-row{display:flex;align-items:center;gap:12px;padding:10px;min-block-size:52px;border-radius:var(--r-sm);text-decoration:none;color:var(--text);position:relative}.lrn-row:hover{background:color-mix(in srgb,var(--text) 5%,transparent)}.lrn-row.is-current{background:color-mix(in srgb,var(--lrn-accent) 12%,var(--card))}.lrn-row.is-current:before{content:"";position:absolute;inset-inline-start:0;inset-block:10px;inline-size:3px;border-radius:3px;background:var(--lrn-accent)}.lrn-row__state{inline-size:30px;block-size:30px;border-radius:50%;flex-shrink:0;display:grid;place-items:center;border:1.5px solid var(--line);color:var(--text-2);background:var(--card)}.lrn-row__state--done{background:var(--lrn-accent);border-color:var(--lrn-accent);color:var(--lrn-on-brand)}@media(prefers-color-scheme:dark){.lrn-row__state--done{color:#111}}.lrn-row__state--locked{border-style:dashed;color:var(--text-3)}.lrn-row__main{flex:1;min-inline-size:0;display:grid;gap:2px}.lrn-row__title{font-weight:600;line-height:1.35}.lrn-row--locked .lrn-row__title{color:var(--text-2)}.lrn-row__sub{display:flex;flex-wrap:wrap;gap:4px 10px;font-size:var(--t-xs);color:var(--text-2)}.lrn-row__why{color:var(--text-2)}.lrn-row__dur{font-size:var(--t-sm);color:var(--text-2);white-space:nowrap}.lrn-player{max-inline-size:1320px;margin:0 auto;padding:0 var(--lrn-gutter) 72px}@media(min-width:960px){.lrn-player{display:grid;grid-template-columns:340px minmax(0,1fr);gap:36px;padding-block-start:24px}}.lrn-side{display:block}.lrn-side[hidden]{display:none}@media(min-width:960px){.lrn-side{position:sticky;inset-block-start:calc(var(--lrn-header-h) + 16px);max-block-size:calc(100vh - var(--lrn-header-h) - 32px);overflow-y:auto;overscroll-behavior:contain;padding-inline-end:4px}}@media(max-width:959.98px){.lrn-side{position:fixed;inset-block:0;inset-inline-start:0;z-index:60;inline-size:min(92vw,380px);overflow-y:auto;overscroll-behavior:contain;background:var(--surface);box-shadow:var(--sh-raised);padding:12px 12px 32px;animation:lrn-sheet-in var(--dur-slow) var(--ease-sheet)}}@keyframes lrn-sheet-in{0%{transform:translate(100%)}to{transform:none}}.lrn-backdrop{position:fixed;inset:0;z-index:55;background:#00000073;animation:lrn-fade var(--dur-fast) ease-out}@keyframes lrn-fade{0%{opacity:0}}.lrn-side__inner{display:grid;gap:14px}.lrn-side__head{display:flex;align-items:center;justify-content:space-between;gap:8px}.lrn-side__course{font-family:var(--font-head);font-weight:700;font-size:1.1rem;text-decoration:none;line-height:1.3}.lrn-side__course:hover{text-decoration:underline}.lrn-meter--side{background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);padding:12px 14px;margin:0}.lrn-search{position:relative}.lrn-search .lrn-icon{position:absolute;inset-inline-start:12px;inset-block-start:50%;transform:translateY(-50%);color:var(--text-3);pointer-events:none}.lrn-search .lrn-input{padding-inline-start:40px}.lrn-player__bar{position:sticky;inset-block-start:var(--lrn-header-h);z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;margin-inline:calc(var(--lrn-gutter) * -1);padding:10px var(--lrn-gutter);background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-block-end:1px solid var(--line)}.lrn-player__barpct{font-size:var(--t-sm);color:var(--text-2);font-weight:600}.lrn-player__main{min-inline-size:0}.lrn-lesson{padding-block-start:20px}@media(min-width:960px){.lrn-lesson{padding-block-start:0}}.lrn-lesson__head{margin-block-end:20px;display:grid;gap:4px;justify-items:start}.lrn-lesson__head .lrn-h1{margin:0}.lrn-lesson__chapter{margin:0;font-size:var(--t-sm);font-weight:600;color:var(--text-2)}.lrn-stage{position:relative;margin-block-end:20px}.lrn-video{position:relative;aspect-ratio:16 / 9;background:#000;border-radius:var(--r-md);overflow:hidden;box-shadow:var(--sh-raised)}@media(max-width:639.98px){.lrn-video{margin-inline:calc(var(--lrn-gutter) * -1);border-radius:0}}.lrn-video iframe,.lrn-embed iframe{position:absolute;inset:0;inline-size:100%;block-size:100%;border:0}.lrn-embed{position:relative;aspect-ratio:16 / 10;border-radius:var(--r-md);overflow:hidden;border:1px solid var(--line);background:var(--card)}@media(max-width:639.98px){.lrn-embed{aspect-ratio:3 / 4}}.lrn-audio{display:grid;gap:16px;justify-items:center;padding:24px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg)}.lrn-audio__cover{inline-size:min(100%,320px);aspect-ratio:1;object-fit:cover;border-radius:var(--r-md);box-shadow:var(--sh-raised)}.lrn-audio audio{inline-size:100%}.lrn-pdf{display:grid;gap:12px}.lrn-pdf__frame{inline-size:100%;block-size:80vh;border:1px solid var(--line);border-radius:var(--r-md);background:var(--card)}.lrn-pdf__phone{display:grid;justify-items:center;gap:10px;text-align:center;padding:28px 20px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);color:var(--text-2)}.lrn-pdf__phone p{margin:0;overflow-wrap:anywhere}.lrn-pdf__actions{display:flex;flex-wrap:wrap;gap:10px}.lrn-countdown{position:absolute;inset:0;z-index:2;border-radius:var(--r-md);display:grid;place-content:center;justify-items:center;gap:6px;text-align:center;padding:16px;background:#0a0a0ad1;color:#fff;animation:lrn-fade var(--dur-fast) ease-out}.lrn-countdown__label{margin:0;font-size:var(--t-sm);color:#fffc}.lrn-countdown__title{margin:0 0 10px;font:600 1.2rem/1.3 var(--font-head)}.lrn-countdown__actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}.lrn-done-row{display:flex;justify-content:flex-end;margin-block:-4px 20px}.lrn-lock{display:flex;gap:16px;align-items:flex-start;padding:24px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg)}.lrn-lock__icon{inline-size:56px;block-size:56px;border-radius:50%;flex-shrink:0;display:grid;place-items:center;background:color-mix(in srgb,var(--text) 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