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auto;overflow:visible;overscroll-behavior:auto;padding-bottom:var(--di-space-6)}.learning-page[data-presentation-mode=video] .lesson-progression{position:sticky;bottom:0;z-index:2}@media(min-width:1024px){.learning-page[data-presentation-mode=video] .lesson-stage{height:100%;overflow:hidden}.learning-page[data-presentation-mode=video] .lesson-stage__scroll{flex:1 1 auto;overflow-y:auto;overscroll-behavior:contain}.learning-page[data-presentation-mode=video] .lesson-progression{position:static}}.lesson-stage--reading,.lesson-stage--locked,.lesson-stage--video-and-reading{height:auto;overflow:visible}.lesson-stage--reading .lesson-stage__scroll,.lesson-stage--locked .lesson-stage__scroll,.lesson-stage--video-and-reading .lesson-stage__scroll{flex:0 0 auto;overflow:visible;padding-bottom:var(--di-space-8)}.lesson-stage--reading .lesson-progression,.lesson-stage--locked .lesson-progression,.lesson-stage--video-and-reading .lesson-progression{position:sticky;bottom:0;z-index:2}.lesson-stage--reading .lesson-stage__content,.lesson-stage--video-and-reading .lesson-stage__content{max-width:var(--di-measure-narrow)}.lesson-stage--locked .lesson-stage__scroll{max-width:40rem}.lesson-stage__video{width:100%;max-width:100%;aspect-ratio:16 / 9;height:auto}.lesson-stage__video :global(.video-lesson),.lesson-stage__video :global(.video-lesson__player),.lesson-stage__video :global(mux-player){width:100%;max-width:100%;border:none;border-radius:0;box-shadow:none;aspect-ratio:16 / 9;height:auto}@media(min-width:1024px){.lesson-stage__video{max-width:56rem;max-height:min(56.25vw,calc(100dvh - 15.5rem))}.lesson-stage__video :global(.video-lesson),.lesson-stage__video :global(.video-lesson__player),.lesson-stage__video :global(mux-player){max-height:inherit}}.lesson-stage__summary{margin:0;max-width:var(--di-measure-narrow);font-size:var(--di-text-body-size);line-height:var(--di-text-body-line);color:var(--di-color-text-secondary)}.lesson-stage__content{max-width:var(--di-measure-narrow);color:var(--di-color-text)}.lesson-stage__block h2{margin:0 0 var(--di-space-2);font-size:var(--di-text-h4-size);line-height:var(--di-text-h4-line)}.lesson-stage__block{max-width:var(--di-measure-narrow)}.lesson-progression{flex:0 0 auto;display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:var(--di-space-3);padding:var(--di-space-2) var(--di-gutter);padding-bottom:max(var(--di-space-2),env(safe-area-inset-bottom));border-top:var(--di-border-width) solid var(--di-color-border);background-color:var(--di-color-surface)}.lesson-progression__item{display:flex;flex-direction:column;gap:0;min-width:0}.lesson-progression__item--next{text-align:right;align-items:flex-end}.lesson-progression__label{font-size:var(--di-text-caption-size);color:var(--di-color-text-muted);font-weight:var(--di-font-weight-medium)}.lesson-progression__link{color:var(--di-color-action-primary);font-weight:var(--di-font-weight-semibold);font-size:var(--di-text-body-sm-size);text-decoration:none;min-height:var(--di-touch-min);display:inline-flex;align-items:center;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-progression__link:hover{color:var(--di-color-action-primary-hover);text-decoration:underline}.lesson-progression__disabled{color:var(--di-color-text-muted);font-weight:var(--di-font-weight-medium);font-size:var(--di-text-body-sm-size);min-height:var(--di-touch-min);display:inline-flex;align-items:center;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-progression__reason{margin:0;font-size:var(--di-text-caption-size);color:var(--di-color-text-muted);max-width:14rem}.lesson-progression__complete{display:flex;justify-content:center;align-items:center}@media(max-width:639px){.lesson-progression{display:flex;flex-direction:column;align-items:stretch;gap:var(--di-space-3);padding-bottom:max(var(--di-space-3),env(safe-area-inset-bottom))}.lesson-progression__item--next{text-align:left;align-items:flex-start}.lesson-progression__link,.lesson-progression__disabled{white-space:normal;overflow:visible;text-overflow:unset;align-items:flex-start}.lesson-progression__reason{max-width:none}.lesson-progression__complete{justify-content:stretch}.lesson-progression__complete :global(.lesson-progress-controls),.lesson-progression__complete :global(button){width:100%}}.learning-header__sr-status{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.learning-page--navigating .lesson-stage__scroll{opacity:.72}.learning-page--navigating [data-nav-pending]{outline:2px solid var(--di-color-action-primary);outline-offset:2px}.learning-page--navigating .curriculum-rail__lesson--current{opacity:.45}.learning-page--navigating .curriculum-rail__lesson--pending-nav{box-shadow:none}.lesson-stage__skeleton{display:flex;flex-direction:column;gap:var(--di-space-3);padding:var(--di-space-4) 0}.lesson-stage__skeleton-line{height:.75rem;max-width:28rem;background-color:var(--di-color-border);border-radius:var(--di-radius-sm)}.lesson-stage__skeleton-media{width:100%;max-width:100%;aspect-ratio:16 / 9;height:auto;background-color:var(--di-color-border)}@media(min-width:1024px){.lesson-stage__skeleton-media{max-width:56rem;max-height:calc(100dvh - 13.5rem)}}@media(prefers-reduced-motion:reduce){.learning-page--navigating .lesson-stage__scroll{opacity:1}}.lesson-nav{display:none}.locked-lesson-state{max-width:36rem;padding:var(--di-space-4) 0}.locked-lesson-state__title{margin:0 0 var(--di-space-3);font-family:var(--di-font-display);font-size:var(--di-text-h3-size);line-height:var(--di-text-h3-line)}.locked-lesson-state__body{margin:0;color:var(--di-color-text-secondary);line-height:var(--di-text-body-line)}.learning-page :global(.commercial-lock){max-width:36rem;margin:var(--di-space-2) 0;padding:var(--di-space-4) 0;border-top:var(--di-border-width) solid var(--di-color-border);border-bottom:var(--di-border-width) solid var(--di-color-border)}.learning-page :global(.commercial-lock h2){font-family:var(--di-font-display);font-size:var(--di-text-h3-size);line-height:var(--di-text-h3-line);margin:0 0 var(--di-space-3)}.learning-page :global(.commercial-lock__cta){min-height:var(--di-touch-min);padding:var(--di-space-3) var(--di-space-5);border-radius:var(--di-radius-md);background-color:var(--di-color-action-primary);color:var(--di-color-on-primary);font-family:var(--di-font-body);font-size:var(--di-text-button-size);font-weight:var(--di-font-weight-semibold)}.learning-page :global(.trial-banner){margin:0;padding:var(--di-space-2) 0;border-bottom:var(--di-border-width) solid var(--di-color-border);font-size:var(--di-text-body-sm-size);color:var(--di-color-text-secondary)}.course-contents-drawer__trigger{appearance:none;min-height:var(--di-touch-min);padding:var(--di-space-2) var(--di-space-4);border:var(--di-border-width) solid var(--di-color-border-strong);border-radius:var(--di-radius-md);background-color:var(--di-color-surface);color:var(--di-color-text);font-family:var(--di-font-body);font-size:var(--di-text-label-size);font-weight:var(--di-font-weight-semibold);cursor:pointer}.course-contents-drawer__overlay{position:fixed;inset:0;z-index:calc(var(--di-z-header) + 10);background-color:var(--di-overlay);display:flex;justify-content:flex-end}.course-contents-drawer__panel{width:min(100%,22rem);max-width:100%;height:100%;background-color:var(--di-color-surface);padding:var(--di-space-4);padding-bottom:max(var(--di-space-4),env(safe-area-inset-bottom));padding-top:max(var(--di-space-4),env(safe-area-inset-top));overflow-y:auto;box-shadow:var(--di-shadow-md);transform:translate(0);transition:transform var(--di-motion-base) var(--di-motion-ease)}.course-contents-drawer__header{display:flex;align-items:center;justify-content:space-between;gap:var(--di-space-3);margin-bottom:var(--di-space-4)}.course-contents-drawer__title{margin:0;font-size:var(--di-text-h5-size);font-weight:var(--di-font-weight-semibold)}.course-contents-drawer__close{appearance:none;min-height:var(--di-touch-min);min-width:var(--di-touch-min);border:var(--di-border-width) solid var(--di-color-border);border-radius:var(--di-radius-md);background:transparent;color:var(--di-color-text);font-family:var(--di-font-body);font-size:var(--di-text-label-size);cursor:pointer}.lesson-progress-controls{display:flex;flex-direction:column;align-items:flex-start;gap:var(--di-space-3)}.lesson-progress-controls--compact{align-items:center;gap:var(--di-space-1)}.lesson-progress-controls__status{margin:0;font-size:var(--di-text-body-sm-size);color:var(--di-color-text-secondary)}.lesson-progress-controls__status--completed{color:var(--di-color-success)}.lesson-progress-controls__status-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.lesson-progress-controls__button{min-height:var(--di-touch-min);padding:var(--di-space-2) var(--di-space-4);border-radius:var(--di-radius-md);border:var(--di-border-width-strong) solid var(--di-color-border-strong);background-color:transparent;color:var(--di-color-action-secondary);font-family:var(--di-font-body);font-size:var(--di-text-button-size);font-weight:var(--di-font-weight-semibold);cursor:pointer;white-space:nowrap}.lesson-progress-controls__button:hover:not(:disabled){border-color:var(--di-color-action-secondary);background-color:var(--di-color-surface)}.lesson-progress-controls__button--completed{border-color:transparent;color:var(--di-color-success);cursor:default}.lesson-progress-controls__button:disabled:not(.lesson-progress-controls__button--completed){opacity:.55;cursor:not-allowed}.lesson-progress-controls__error{margin:0;font-size:var(--di-text-caption-size);color:var(--di-color-text-secondary);text-align:center;max-width:12rem}.lesson-progress-controls__continue{margin:0;font-size:var(--di-text-caption-size);color:var(--di-color-text-muted);text-align:center}.secure-mux-player{position:relative;width:100%;max-width:100%}.secure-mux-player__sr-status{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.secure-mux-player__retry{appearance:none;align-self:flex-start;min-height:var(--di-touch-min);padding:var(--di-space-2) var(--di-space-4);border:var(--di-border-width) solid var(--di-color-border-strong);border-radius:var(--di-radius-md);background-color:var(--di-color-surface);color:var(--di-color-text);font-family:var(--di-font-body);font-size:var(--di-text-label-size);font-weight:var(--di-font-weight-semibold);cursor:pointer}@media(prefers-reduced-motion:reduce){.course-contents-drawer__panel{transition:none}}