@keyframes lesson-rise-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes lesson-view-transition-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes lesson-view-transition-out{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-6px)}}@keyframes lesson-rise-in-loud{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes lesson-flip-to-back{0%{transform:rotateY(0)}to{transform:rotateY(180deg)}}@keyframes lesson-flip-to-front{0%{transform:rotateY(180deg)}to{transform:rotateY(0)}}@keyframes lesson-toast-pulse{0%{opacity:1;transform:scale(1)}40%{opacity:1;transform:scale(1.05)}to{opacity:1;transform:scale(1)}}@keyframes lesson-glow-breath{0%,to{opacity:.85}50%{opacity:1}}@keyframes lesson-dd-shake{0%,to{transform:translate(0)}15%{transform:translate(-6px)}30%{transform:translate(5px)}45%{transform:translate(-4px)}60%{transform:translate(3px)}75%{transform:translate(-2px)}}@keyframes lesson-widget-rise{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:no-preference){::view-transition-old(lesson-content){animation:lesson-view-transition-out .22s var(--ease-in-out) both}::view-transition-new(lesson-content){animation:lesson-view-transition-in .28s var(--ease-in-out) both}.lesson-surface .av-qz-opt{transition:border-color var(--duration-base) var(--ease-out), background-color var(--duration-base) var(--ease-out)}.lesson-surface [data-mounted=false]{opacity:0}.lesson-surface [data-mounted=true]{animation:lesson-rise-in var(--duration-slow) var(--ease-out) both}.lesson-surface .av-callout[data-observe=true]:not(.is-revealed){opacity:0;transform:translateY(12px)}.lesson-surface .av-callout.is-revealed{opacity:1;transition:opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);transform:translateY(0)}.lesson-surface .av-flashcard-card{transition:transform var(--duration-base) var(--ease-out), box-shadow var(--duration-base) var(--ease-out), border-color var(--duration-base) var(--ease-out)}.lesson-surface .av-dd-chip{transition:border-color var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out), box-shadow var(--duration-base) var(--ease-out)}.lesson-surface .av-dd-chip:hover{box-shadow:0 2px 6px var(--lesson-purple-accent);transform:translateY(-1px)}@supports (color:color-mix(in lab, red, red)){.lesson-surface .av-dd-chip:hover{box-shadow:0 2px 6px color-mix(in srgb, var(--lesson-purple-accent) 14%, transparent)}}.lesson-surface .av-dd-slot{transition:border-color var(--duration-base) var(--ease-out), background-color var(--duration-base) var(--ease-out)}.lesson-surface .av-dd-slot.is-target{border-color:var(--lesson-purple-accent);background:var(--lesson-purple-accent)}@supports (color:color-mix(in lab, red, red)){.lesson-surface .av-dd-slot.is-target{background:color-mix(in srgb, var(--lesson-purple-accent) 30%, transparent)}}.lesson-surface .av-dd-slot.is-ok,.lesson-surface .av-dd-slot.is-no{transition:border-color var(--duration-slow) var(--ease-out)}.lesson-surface .av-cbcopy{transition:color var(--duration-base) var(--ease-out), transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out)}.lesson-surface .av-cbcopy.done{animation:lesson-toast-pulse var(--duration-slow) var(--ease-out)}.lesson-surface .av-qz:focus-within:before{animation:lesson-glow-breath 3s var(--ease-in-out) infinite}.lesson-surface .av-dd-slot.is-flash-no{animation:lesson-dd-shake .48s var(--ease-out) both}.lesson-surface .av-qz[data-rise-pending=true],.lesson-surface .av-flashcard[data-rise-pending=true],.lesson-surface .av-dd[data-rise-pending=true]{opacity:0;transform:translateY(8px)}.lesson-surface .av-qz[data-rise=true],.lesson-surface .av-flashcard[data-rise=true],.lesson-surface .av-dd[data-rise=true]{animation:lesson-widget-rise var(--duration-base) var(--ease-out) both}.lesson-surface .av-qz[data-stagger="1"],.lesson-surface .av-flashcard[data-stagger="1"],.lesson-surface .av-dd[data-stagger="1"]{animation-delay:80ms}.lesson-surface .av-qz[data-stagger="2"],.lesson-surface .av-flashcard[data-stagger="2"],.lesson-surface .av-dd[data-stagger="2"]{animation-delay:.16s}.lesson-surface .av-qz[data-stagger="3"],.lesson-surface .av-flashcard[data-stagger="3"],.lesson-surface .av-dd[data-stagger="3"]{animation-delay:.24s}}@media (hover:hover) and (prefers-reduced-motion:no-preference){.lesson-surface .av-qz-go:not(:disabled),.lesson-surface .av-dd-go:not(:disabled){transition:transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out)}.lesson-surface .av-qz-go:not(:disabled):hover,.lesson-surface .av-dd-go:not(:disabled):hover,.lesson-surface .av-cbcopy:hover{box-shadow:0 2px 8px var(--lesson-purple-accent);transform:translateY(-1px)}@supports (color:color-mix(in lab, red, red)){.lesson-surface .av-qz-go:not(:disabled):hover,.lesson-surface .av-dd-go:not(:disabled):hover,.lesson-surface .av-cbcopy:hover{box-shadow:0 2px 8px color-mix(in srgb, var(--lesson-purple-accent) 14%, transparent)}}}@media (prefers-reduced-motion:reduce){::view-transition-old(lesson-content){animation-duration:.001ms!important;transform:none!important}::view-transition-new(lesson-content){animation-duration:.001ms!important;transform:none!important}.lesson-surface .av-callout,.lesson-surface .av-callout.is-revealed{opacity:1;transition:none;transform:none}.lesson-surface .av-qz-opt{transition:none}.lesson-surface .av-flashcard-card{perspective:none;transition:none;transform:none!important}.lesson-surface .av-flashcard-front,.lesson-surface .av-flashcard-back{backface-visibility:visible;display:none;position:static;transform:none}.lesson-surface .av-flashcard-card:not(.is-flipped) .av-flashcard-front,.lesson-surface .av-flashcard-card.is-flipped .av-flashcard-back{display:block}.lesson-surface .av-flashcard-track{scroll-behavior:auto}.lesson-surface .av-dd-chip:hover{box-shadow:none;transform:none}.lesson-surface .av-dd-chip,.lesson-surface .av-dd-slot,.lesson-surface .av-dd-slot.is-ok,.lesson-surface .av-dd-slot.is-no{transition:none}.lesson-surface .av-cbcopy.done,.lesson-surface .av-qz:focus-within:before{animation:none}.lesson-surface .av-qz-go,.lesson-surface .av-dd-go,.lesson-surface .av-cbcopy{transition:none}.lesson-surface .av-qz-go:hover,.lesson-surface .av-dd-go:hover,.lesson-surface .av-cbcopy:hover{box-shadow:none;transform:none}.lesson-surface [data-mounted=false]{opacity:1}.lesson-surface [data-mounted=true],.lesson-surface .av-dd-slot.is-flash-no{animation:none}.lesson-surface .av-qz[data-rise-pending=true],.lesson-surface .av-flashcard[data-rise-pending=true],.lesson-surface .av-dd[data-rise-pending=true],.lesson-surface .av-qz[data-rise=true],.lesson-surface .av-flashcard[data-rise=true],.lesson-surface .av-dd[data-rise=true]{opacity:1;animation:none;transform:none}}.lesson-surface{--lesson-text-primary:var(--color-body);--lesson-text-secondary:var(--color-muted);--lesson-text-highlight:var(--color-display);--lesson-text-placeholder:var(--color-muted);--lesson-bg-primary:var(--color-ink);--lesson-bg-secondary:var(--color-raised);--lesson-bg-card:var(--color-surface);--lesson-bg-disabled:var(--color-raised)}@supports (color:color-mix(in lab, red, red)){.lesson-surface{--lesson-bg-disabled:color-mix(in srgb, var(--color-raised) 70%, var(--color-ink))}}.lesson-surface{--lesson-border-primary:var(--color-graphite);--lesson-border-secondary:var(--color-graphite)}@supports (color:color-mix(in lab, red, red)){.lesson-surface{--lesson-border-secondary:color-mix(in srgb, var(--color-graphite) 70%, var(--color-muted))}}.lesson-surface{--lesson-purple-border:var(--color-display)}@supports (color:color-mix(in lab, red, red)){.lesson-surface{--lesson-purple-border:color-mix(in srgb, var(--color-display) 28%, var(--color-graphite))}}.lesson-surface{--lesson-purple-accent:var(--color-display);--lesson-callout-info-border:var(--color-body)}@supports (color:color-mix(in lab, red, red)){.lesson-surface{--lesson-callout-info-border:color-mix(in srgb, var(--color-body) 45%, var(--color-graphite))}}.lesson-surface{--lesson-callout-ok-border:var(--color-verified);--lesson-callout-warn-border:var(--color-stale)}@supports (color:color-mix(in lab, red, red)){.lesson-surface{--lesson-callout-warn-border:color-mix(in srgb, var(--color-stale) 55%, var(--color-muted))}}.lesson-surface{--lesson-callout-error-border:var(--color-stale);--lesson-icon-success:var(--color-verified);--lesson-icon-info:var(--color-body);--lesson-icon-error:var(--color-stale);color:var(--lesson-text-primary)}:root[data-theme=light] .lesson-surface{--lesson-text-primary:var(--color-body);--lesson-text-secondary:var(--color-muted);--lesson-text-highlight:var(--color-display);--lesson-text-placeholder:var(--color-muted);--lesson-bg-primary:var(--color-ink);--lesson-bg-secondary:var(--color-raised);--lesson-bg-card:var(--color-surface);--lesson-bg-disabled:var(--color-raised)}@supports (color:color-mix(in lab, red, red)){:root[data-theme=light] .lesson-surface{--lesson-bg-disabled:color-mix(in srgb, var(--color-raised) 80%, var(--color-ink))}}:root[data-theme=light] .lesson-surface{--lesson-border-primary:var(--color-graphite);--lesson-border-secondary:var(--color-graphite)}@supports (color:color-mix(in lab, red, red)){:root[data-theme=light] .lesson-surface{--lesson-border-secondary:color-mix(in srgb, var(--color-graphite) 75%, var(--color-muted))}}:root[data-theme=light] .lesson-surface{--lesson-purple-border:var(--color-display)}@supports (color:color-mix(in lab, red, red)){:root[data-theme=light] .lesson-surface{--lesson-purple-border:color-mix(in srgb, var(--color-display) 18%, var(--color-graphite))}}:root[data-theme=light] .lesson-surface{--lesson-purple-accent:var(--color-display);--lesson-callout-info-border:var(--color-body)}@supports (color:color-mix(in lab, red, red)){:root[data-theme=light] .lesson-surface{--lesson-callout-info-border:color-mix(in srgb, var(--color-body) 35%, var(--color-graphite))}}:root[data-theme=light] .lesson-surface{--lesson-callout-ok-border:var(--color-verified);--lesson-callout-warn-border:var(--color-stale)}@supports (color:color-mix(in lab, red, red)){:root[data-theme=light] .lesson-surface{--lesson-callout-warn-border:color-mix(in srgb, var(--color-stale) 50%, var(--color-muted))}}:root[data-theme=light] .lesson-surface{--lesson-callout-error-border:var(--color-stale);--lesson-icon-success:var(--color-verified);--lesson-icon-info:var(--color-body);--lesson-icon-error:var(--color-stale)}.lesson-surface h1,.lesson-surface h2,.lesson-surface h3{color:var(--lesson-text-highlight)}.lesson-surface p,.lesson-surface li{color:var(--lesson-text-primary)}.lesson-surface .av-dek{color:var(--lesson-text-secondary)}.lesson-surface :not(pre)>code{color:var(--lesson-text-highlight);background:var(--lesson-bg-secondary)}@media (hover:hover) and (prefers-reduced-motion:no-preference){.lesson-surface :not(pre)>code{transition:background-color var(--duration-fast) var(--ease-out)}.lesson-surface :not(pre)>code:hover{background-color:var(--lesson-purple-accent)}@supports (color:color-mix(in lab, red, red)){.lesson-surface :not(pre)>code:hover{background-color:color-mix(in srgb, var(--lesson-purple-accent) 8%, var(--lesson-bg-secondary))}}}.lesson-surface .av-co{border-left-color:var(--lesson-border-secondary);background:var(--lesson-bg-card);color:var(--lesson-text-secondary)}.lesson-surface table{border-color:var(--lesson-border-primary)}.lesson-surface th{color:var(--lesson-text-secondary);border-bottom-color:var(--lesson-border-primary)}.lesson-surface td{border-bottom-color:var(--lesson-border-primary)}.lesson-surface .av-qz{isolation:isolate;background:var(--lesson-bg-card);border-color:var(--lesson-purple-border);position:relative}.lesson-surface .av-qz:before{content:"";z-index:0;pointer-events:none;background:radial-gradient(ellipse 80% 55% at 50% 0%, var(--lesson-purple-accent), transparent 70%);position:absolute;inset:0}@supports (color:color-mix(in lab, red, red)){.lesson-surface .av-qz:before{background:radial-gradient(ellipse 80% 55% at 50% 0%, color-mix(in srgb, var(--lesson-purple-accent) 16%, transparent), transparent 70%)}}.lesson-surface .av-qz>*{z-index:1;position:relative}@media (prefers-reduced-motion:no-preference){.lesson-surface .av-qz:before{opacity:.82;transition:opacity var(--duration-fast) var(--ease-out)}.lesson-surface .av-qz:hover:before,.lesson-surface .av-qz:focus-within:before{opacity:1}.lesson-surface .av-qz-opt{transition:border-color var(--duration-base) var(--ease-out), background-color var(--duration-base) var(--ease-out)}}.lesson-surface .av-qz-hd{color:var(--lesson-text-secondary);border-bottom-color:var(--lesson-border-primary)}.lesson-surface .av-qz-q{color:var(--lesson-text-highlight)}.lesson-surface .av-qz-code,.lesson-surface .av-qz-opt{background:var(--lesson-bg-primary);border-color:var(--lesson-border-primary);color:var(--lesson-text-primary)}.lesson-surface .av-qz-opt:hover{border-color:var(--lesson-border-secondary)}.lesson-surface .av-qz-opt.ok{border-color:var(--lesson-callout-ok-border);background:var(--lesson-icon-success)}@supports (color:color-mix(in lab, red, red)){.lesson-surface .av-qz-opt.ok{background:color-mix(in srgb, var(--lesson-icon-success) 9%, var(--lesson-bg-primary))}}.lesson-surface .av-qz-opt.no{border-color:var(--lesson-callout-error-border);background:var(--lesson-icon-error)}@supports (color:color-mix(in lab, red, red)){.lesson-surface .av-qz-opt.no{background:color-mix(in srgb, var(--lesson-icon-error) 9%, var(--lesson-bg-primary))}}.lesson-surface .av-qz-lt{color:var(--lesson-text-placeholder)}.lesson-surface .av-qz-verdict.ok{color:var(--lesson-icon-success)}.lesson-surface .av-qz-verdict.no{color:var(--lesson-icon-error)}.lesson-surface .av-qz-ex{border-top-color:var(--lesson-border-primary);color:var(--lesson-text-secondary)}.lesson-surface .av-qz-ex b{color:var(--lesson-text-highlight)}.lesson-surface .av-qz-go{background:var(--lesson-bg-secondary);border-color:var(--lesson-border-primary);color:var(--lesson-text-highlight)}.lesson-surface .av-qz-go:disabled{background:var(--lesson-bg-disabled);color:var(--lesson-text-placeholder)}.lesson-surface .av-qz-ft{border-top:1px solid var(--lesson-border-primary);grid-template-columns:auto 1fr auto;align-items:center;gap:.6rem;margin-top:.9rem;padding-top:.75rem;display:grid}.lesson-surface .av-qz-reset{background:var(--lesson-bg-secondary);border:1px solid var(--lesson-border-primary);width:2rem;height:2rem;color:var(--lesson-text-highlight);border-radius:var(--radius-sm);cursor:pointer;justify-content:center;align-items:center;display:inline-flex}.lesson-surface .av-qz-reset:disabled{background:var(--lesson-bg-disabled);color:var(--lesson-text-placeholder);cursor:not-allowed}.lesson-surface .av-qz-pag{justify-self:center;align-items:center;gap:.4rem;display:inline-flex}.lesson-surface .av-qz-arrow{background:var(--lesson-bg-secondary);border:1px solid var(--lesson-border-primary);width:2rem;height:2rem;color:var(--lesson-text-highlight);border-radius:var(--radius-sm);cursor:pointer;justify-content:center;align-items:center;display:inline-flex}.lesson-surface .av-qz-arrow:disabled{background:var(--lesson-bg-disabled);color:var(--lesson-text-placeholder);cursor:not-allowed}.lesson-surface .av-qz-counter{font-family:var(--font-mono);letter-spacing:.08em;color:var(--lesson-text-secondary);text-align:center;min-width:3rem;font-size:.75rem}.lesson-surface .av-qz-go.av-qz-finish{border-color:var(--lesson-border-secondary)}.av-flashcard{background:var(--lesson-bg-card);border:1px solid var(--lesson-border-primary);border-radius:var(--radius-md);margin:1.8rem 0;padding:.85rem .9rem 1rem}.av-flashcard-hd{font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--lesson-text-secondary);justify-content:space-between;gap:.75rem;margin-bottom:.75rem;font-size:.72rem;display:flex}.av-flashcard-flip-hint{font-family:var(--font-mono);letter-spacing:.08em;text-transform:lowercase;color:var(--color-display);margin-top:.85rem;font-size:.7rem;display:block}@supports (color:color-mix(in lab, red, red)){.av-flashcard-flip-hint{color:color-mix(in srgb, var(--color-display) 65%, transparent)}}.av-flashcard-swipe-hint{font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;color:var(--lesson-text-secondary);text-align:center;margin:.55rem 0 0;font-size:.66rem}@media (min-width:901px){.av-flashcard-swipe-hint{display:none}}.av-flashcard-nav{justify-content:flex-end;gap:.4rem;margin-bottom:.65rem;display:flex}.av-flashcard-arrow{font-family:var(--font-mono);background:var(--lesson-bg-secondary);border:1px solid var(--lesson-border-primary);width:2rem;height:2rem;color:var(--lesson-text-highlight);border-radius:var(--radius-sm);cursor:pointer;font-size:1.1rem;line-height:1}.av-flashcard-arrow:disabled{background:var(--lesson-bg-disabled);color:var(--lesson-text-placeholder);cursor:not-allowed}.av-flashcard-track{scroll-snap-type:x 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var(--lesson-purple-accent);outline-offset:2px;border-color:var(--lesson-purple-accent)}}.av-flashcard-card.is-flipped{border-color:var(--lesson-purple-accent);background-color:var(--lesson-purple-accent)}@supports (color:color-mix(in lab, red, red)){.av-flashcard-card.is-flipped{background-color:color-mix(in srgb, var(--lesson-purple-accent) 6%, var(--lesson-bg-primary))}}.av-flashcard-front,.av-flashcard-back{color:var(--lesson-text-primary)}.av-flashcard-card:not(.is-flipped) .av-flashcard-back,.av-flashcard-card.is-flipped .av-flashcard-front{display:none}.av-flashcard-card.is-flipped .av-flashcard-back{color:var(--color-display)}@media (max-width:1000px){.av-flashcard-nav{display:none}.av-flashcard-track{scroll-snap-type:none;flex-direction:column;gap:.75rem;overflow-x:visible}.av-flashcard-card{flex:none;width:100%;min-height:0}.lesson-surface .av-flashcard-back{position:static;inset:auto;transform:none}.lesson-surface .av-flashcard-front,.lesson-surface .av-flashcard-back{backface-visibility:visible}}@media (max-width:480px){.av-flashcard-hd{flex-wrap:wrap;gap:.4rem .6rem}.av-flashcard-hd>span:nth-child(2){flex:auto;min-width:0}.av-flashcard-hd>span:nth-child(3){flex:none;font-size:.68rem}}.av-callout{background:var(--lesson-bg-card);border:1px solid var(--lesson-border-primary);border-radius:var(--radius-md);border-left-width:4px;margin:1.3rem 0;padding:.9rem 1.1rem .9rem 1.25rem;position:relative}.av-callout-title{color:var(--lesson-text-highlight);margin:0 0 .35rem;font-weight:600}.av-callout-body{color:var(--lesson-text-secondary);margin:0}.av-callout-body code{color:var(--lesson-text-highlight);background:var(--lesson-bg-secondary)}.av-callout:before{content:"";background:var(--lesson-icon-info);border-radius:999px;width:.45rem;height:.45rem;position:absolute;top:1.05rem;right:1rem}.av-callout--info{border-left-color:var(--lesson-callout-info-border)}.av-callout--success{border-left-color:var(--lesson-callout-ok-border)}.av-callout--success:before{background:var(--lesson-icon-success)}.av-callout--warn{border-left-color:var(--lesson-callout-warn-border)}.av-callout--error{border-left-color:var(--lesson-callout-error-border)}.av-callout--error:before{background:var(--lesson-icon-error)}.av-dd{background:var(--lesson-bg-card);border:1px solid var(--lesson-border-primary);border-radius:var(--radius-md);margin:1.8rem 0;padding:.85rem .9rem 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.av-scrim{display:block}.av-view>.av-main{min-height:0;padding:1.5rem 1.25rem 4rem}.av-view>.av-rail{display:none}.av-mbar{display:block}.av-pnav{grid-template-columns:1fr}.av-pnav a.nx{text-align:left}.av-inner h1{font-size:clamp(1.55rem,7vw,2rem)}}@media (prefers-reduced-motion:reduce){.av-pbar rect{animation:none;transform:none}.av-tk,.av-tk .av-tk-l,.av-pnav a{transition:none}.av-pnav a:hover{box-shadow:none;transform:none}}