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lab, red, red)){html[data-theme=dark] .lesson-section-badge--video{border-color:color-mix(in srgb, var(--color-negative) 25%, transparent)}}.lesson-video{max-width:var(--step-measure);margin:0 auto;padding:2rem 1rem}.lesson-video__title{color:var(--color-txt);letter-spacing:-.3px;margin:.875rem 0 1.25rem;font-size:1.5rem;font-weight:800;line-height:1.3}.lesson-video__player{border:1px solid var(--color-border-subtle);width:100%;box-shadow:0 1px 3px var(--color-shade), 0 4px 16px var(--color-shade);background:#000;border-radius:16px;display:block}@supports (color:color-mix(in lab, red, red)){.lesson-video__player{box-shadow:0 1px 3px color-mix(in srgb, var(--color-shade) 11%, transparent), 0 4px 16px color-mix(in srgb, var(--color-shade) 6%, transparent)}}.lesson-video__duration{font-family:var(--font-mono);color:var(--color-muted);margin:.75rem 0 0;font-size:.8125rem}.lesson-nav-footer{z-index:30;background:linear-gradient(to top, var(--color-bg) 80%, transparent);-webkit-backdrop-filter:blur(12px);border-top:1px solid #1d12260a;padding:.75rem 0;position:fixed;bottom:0;left:0;right:0}@supports (color:color-mix(in lab, red, red)){.lesson-nav-footer{border-top:1px solid color-mix(in srgb, var(--color-txt) 4%, transparent)}}html[data-theme=dark] .lesson-nav-footer{background:linear-gradient(to top, var(--color-bg) 80%, transparent)}.lesson-btn--primary{background:var(--color-accent);color:var(--color-accent-text);font-family:var(--font-sans);cursor:pointer;box-shadow:0 2px 8px var(--color-shade), inset 0 1px 0 #ffffff24;border:none;border-radius:14px;justify-content:center;align-items:center;padding:.9375rem 1.75rem;font-size:.9375rem;font-weight:600;transition:transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .3s;display:flex}@supports (color:color-mix(in lab, red, red)){.lesson-btn--primary{box-shadow:0 2px 8px color-mix(in srgb, var(--color-shade) 56%, transparent), inset 0 1px 0 color-mix(in srgb, var(--color-accent-text) 14%, transparent)}}.lesson-btn--primary:hover{box-shadow:0 6px 20px var(--color-shade), inset 0 1px 0 #ffffff2e;transform:translateY(-2px)}@supports (color:color-mix(in lab, red, red)){.lesson-btn--primary:hover{box-shadow:0 6px 20px color-mix(in srgb, var(--color-shade) 89%, transparent), inset 0 1px 0 color-mix(in srgb, var(--color-accent-text) 18%, transparent)}}.lesson-btn--primary:active{box-shadow:0 1px 4px var(--color-shade);transform:translateY(0)}@supports (color:color-mix(in lab, red, red)){.lesson-btn--primary:active{box-shadow:0 1px 4px color-mix(in srgb, var(--color-shade) 44%, transparent)}}.lesson-btn--muted{background:#1d122614;border:none;border-radius:11px;justify-content:center;align-items:center;padding:.875rem 1.5rem;display:flex}@supports (color:color-mix(in lab, red, red)){.lesson-btn--muted{background:color-mix(in srgb, var(--color-txt) 8%, 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flashSlideIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.section-audio-spinner{border:2px solid var(--color-border-subtle);border-top-color:var(--color-accent);border-radius:50%;width:1.25rem;height:1.25rem;animation:.6s linear infinite sectionAudioSpin}:root{--color-section-audio-active:#575bf0}html[data-theme=dark]{--color-section-audio-active:#818cf8}.skeleton-shimmer{background:linear-gradient(90deg,#1d12260a 25%,#1d122614 50%,#1d12260a 75%)}@supports (color:color-mix(in lab, red, red)){.skeleton-shimmer{background:linear-gradient(90deg, color-mix(in srgb, var(--color-txt) 4%, transparent) 25%, color-mix(in srgb, var(--color-txt) 8%, transparent) 50%, color-mix(in srgb, var(--color-txt) 4%, transparent) 75%)}}.skeleton-shimmer{background-size:200% 100%;animation:1.8s ease-in-out infinite skeletonShimmer}@keyframes skeletonShimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-spinner{border:2px solid #1d122614;width:1.125rem;height:1.125rem}@supports (color:color-mix(in lab, red, red)){.skeleton-spinner{border:2px solid color-mix(in srgb, var(--color-txt) 8%, transparent)}}.skeleton-spinner{border-top-color:var(--color-accent);border-radius:50%;animation:.7s linear infinite sectionAudioSpin}.lesson-summary-point{animation:.4s both lessonFadeIn}@keyframes lessonCheckBounce{0%{opacity:0;transform:scale(0)}50%{transform:scale(1.2)}to{opacity:1;transform:scale(1)}}@keyframes lessonXpGlow{0%{box-shadow:0 0 0 0 color-mix(in srgb, var(--color-highlight) 40%, transparent)}50%{box-shadow:0 0 20px 4px color-mix(in srgb, var(--color-highlight) 20%, transparent)}to{box-shadow:0 0 0 0 color-mix(in srgb, var(--color-highlight) 0%, transparent)}}@keyframes lessonLevelPulse{0%{opacity:0;transform:scale(0)}60%{transform:scale(1.15)}to{opacity:1;transform:scale(1)}}.lesson-completion-screen{justify-content:center;align-items:center;min-height:20rem;padding:3rem 1rem;animation:.5s both lessonFadeIn;display:flex}.lesson-completion-inner{text-align:center;max-width:24rem}.lesson-completion-check{background:var(--color-progress-bar);width:5rem;height:5rem;color:var(--color-accent-text);border-radius:50%;justify-content:center;align-items:center;margin-bottom:1.5rem;animation:.5s cubic-bezier(.34,1.56,.64,1) both lessonCheckBounce;display:inline-flex}.lesson-completion-heading{font-family:var(--font-sans);color:var(--color-txt);margin:0 0 .5rem;font-size:1.5rem;font-weight:700;animation:.4s .2s both lessonFadeIn}.lesson-completion-sub{color:var(--color-sub);margin:0 0 1.25rem;font-size:.9375rem;animation:.4s .35s both lessonFadeIn}.lesson-completion-xp{margin-bottom:1rem;animation:.4s .4s both lessonFadeIn}.lesson-completion-xp-badge{font-family:var(--font-mono);color:var(--color-signal-text);background:var(--color-highlight);font-size:1.125rem;font-weight:700;display:inline-block}@supports (color:color-mix(in lab, red, red)){.lesson-completion-xp-badge{background:color-mix(in srgb, var(--color-highlight) 8%, transparent)}}.lesson-completion-xp-badge{border:1px solid var(--color-highlight)}@supports (color:color-mix(in lab, red, red)){.lesson-completion-xp-badge{border:1px solid color-mix(in srgb, var(--color-highlight) 20%, transparent)}}.lesson-completion-xp-badge{border-radius:12px;padding:.5rem 1.25rem;animation:1.5s .6s lessonXpGlow}.lesson-completion-level{margin-bottom:1rem;animation:.6s cubic-bezier(.34,1.56,.64,1) .5s both lessonLevelPulse}.lesson-completion-level-label{font-family:var(--font-mono);color:var(--color-signal-text);letter-spacing:2px;text-transform:uppercase;margin-bottom:.25rem;font-size:.625rem;font-weight:600;display:block}.lesson-completion-level-number{font-family:var(--font-mono);color:var(--color-txt);text-shadow:0 0 40px var(--color-highlight);font-size:3rem;font-weight:700;line-height:1;display:block}@supports (color:color-mix(in lab, red, red)){.lesson-completion-level-number{text-shadow:0 0 40px color-mix(in srgb, var(--color-highlight) 30%, transparent)}}.lesson-completion-streak{align-items:center;gap:.375rem;margin-bottom:1.25rem;animation:.4s .55s both lessonFadeIn;display:inline-flex}.lesson-completion-streak-flame{font-size:1.25rem}.lesson-completion-streak-count{font-family:var(--font-mono);color:var(--color-sub);font-size:.875rem;font-weight:600}.lesson-completion-actions{flex-direction:column;align-items:center;gap:.625rem;margin-top:.5rem;animation:.4s .6s both lessonFadeIn;display:flex}.lesson-completion-btn{font-family:var(--font-sans);border-radius:11px;justify-content:center;align-items:center;gap:.375rem;width:100%;max-width:20rem;padding:.875rem 2rem;font-size:.9375rem;font-weight:600;text-decoration:none;transition:transform .2s,box-shadow 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(prefers-reduced-motion:reduce){.lesson-section{will-change:auto!important;transition:none!important}.lesson-section--exit-left,.lesson-section--exit-right,.lesson-section--enter-left,.lesson-section--enter-right{opacity:1!important;transform:none!important}.lesson-waveform-bar{animation:none!important;transform:scaleY(.5)!important}.lesson-btn--shake{animation:none!important}.animate-fade-in,.animate-bounce-once,.lesson-summary-point,.lesson-completion-screen,.lesson-completion-check,.lesson-completion-heading,.lesson-completion-sub,.lesson-completion-btn,.lesson-completion-xp,.lesson-completion-xp-badge,.lesson-completion-level,.lesson-completion-streak,.lesson-completion-actions{opacity:1!important;animation:none!important}}.lesson-hud{z-index:30;background:linear-gradient(to bottom, var(--color-bg) 90%, transparent);-webkit-backdrop-filter:blur(12px);max-width:48rem;margin:0 auto;padding:.625rem 1rem .5rem;position:sticky;top:0}.lesson-hud-progress{align-items:center;gap:3px;height:10px;margin-bottom:.375rem;display:flex}.lesson-hud-progress .lesson-progress-segment{height:10px;box-shadow:inset 0 1px 2px var(--color-shade);border-radius:5px}@supports (color:color-mix(in lab, red, red)){.lesson-hud-progress .lesson-progress-segment{box-shadow:inset 0 1px 2px color-mix(in srgb, var(--color-shade) 22%, transparent)}}.lesson-hud-stats{align-items:center;gap:.625rem;display:flex}.lesson-hud-hearts{background:var(--color-negative);border-radius:20px;align-items:center;gap:3px;padding:.25rem .625rem;display:flex}@supports (color:color-mix(in lab, red, red)){.lesson-hud-hearts{background:color-mix(in srgb, var(--color-negative) 8%, transparent)}}.lesson-hud-hearts{color:var(--color-negative);font-size:.8125rem;font-weight:700}.lesson-hud-hearts.shake,.lesson-hud-hearts.lesson-hearts--shake{animation:.4s lessonShake}.lesson-hud-hearts.lesson-hearts--critical{animation:1s infinite timer-pulse}.lesson-hud-streak{background:linear-gradient(135deg, var(--color-highlight), var(--color-highlight));border-radius:20px;align-items:center;gap:3px;padding:.25rem .625rem;display:flex}@supports (color:color-mix(in lab, red, red)){.lesson-hud-streak{background:linear-gradient(135deg, color-mix(in srgb, var(--color-highlight) 16%, transparent), color-mix(in srgb, var(--color-highlight) 16%, transparent))}}.lesson-hud-streak{color:var(--color-warning);font-size:.8125rem;font-weight:700}.lesson-hud-streak-fire{animation:1s infinite lesson-wiggle;display:inline-block}@keyframes lesson-wiggle{0%,to{transform:rotate(0)}25%{transform:rotate(-8deg)}75%{transform:rotate(8deg)}}.lesson-hud-xp{background:#1d122614;border-radius:20px;align-items:center;gap:.375rem;padding:.25rem .375rem .25rem .625rem;display:flex}@supports (color:color-mix(in lab, red, red)){.lesson-hud-xp{background:color-mix(in srgb, var(--color-txt) 8%, transparent)}}.lesson-hud-xp{border:1px solid var(--color-border-subtle)}.lesson-hud-xp-track{background:var(--color-border-subtle);border-radius:5px;width:4.5rem;height:10px;position:relative;overflow:hidden}.lesson-hud-xp-fill{background:linear-gradient(90deg, var(--color-highlight), var(--color-negative));border-radius:5px;height:100%;transition:width .8s cubic-bezier(.4,0,.2,1);position:relative}.lesson-hud-xp-fill:after{content:"";background:linear-gradient(180deg, var(--color-hi), transparent);position:absolute;inset:0}@supports (color:color-mix(in lab, red, red)){.lesson-hud-xp-fill:after{background:linear-gradient(180deg, color-mix(in srgb, var(--color-hi) 40%, transparent), transparent)}}.lesson-hud-xp-fill:after{border-radius:5px}.lesson-hud-xp-fill.pulse,.lesson-xp--pulse .lesson-hud-xp-fill{animation:.6s xp-bar-pulse}@keyframes xp-bar-pulse{0%,to{filter:brightness()}50%{filter:brightness(1.5)}}.lesson-hud-xp-level{background:var(--color-accent);width:1.625rem;height:1.625rem;color:var(--color-accent-text);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.6875rem;font-weight:800;display:flex}.quiz-timer{background:linear-gradient(135deg, #6a2ea029, var(--color-highlight));border-radius:20px;align-items:center;gap:.375rem;padding:.375rem .75rem;display:flex}@supports (color:color-mix(in lab, red, red)){.quiz-timer{background:linear-gradient(135deg, color-mix(in srgb, var(--color-accent) 16%, transparent), color-mix(in srgb, var(--color-highlight) 16%, transparent))}}.quiz-timer{color:var(--color-negative);flex-shrink:0;font-size:.875rem;font-weight:700;transition:all .3s}.quiz-timer svg{color:var(--color-negative)}.quiz-timer.urgent{color:var(--color-negative);background:linear-gradient(135deg, var(--color-negative), var(--color-negative));animation:1s infinite timer-pulse}@supports (color:color-mix(in lab, red, red)){.quiz-timer.urgent{background:linear-gradient(135deg, color-mix(in srgb, var(--color-negative) 16%, transparent), color-mix(in srgb, var(--color-negative) 16%, transparent))}}.quiz-timer.urgent svg{color:var(--color-negative)}@keyframes timer-pulse{0%,to{opacity:1}50%{opacity:.5}}.quiz-bonus-tag{background:linear-gradient(135deg, var(--color-highlight), var(--color-highlight));border-radius:8px;align-items:center;gap:.25rem;padding:.25rem .625rem;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.quiz-bonus-tag{background:linear-gradient(135deg, color-mix(in srgb, var(--color-highlight) 14%, transparent), color-mix(in srgb, var(--color-highlight) 14%, transparent))}}.quiz-bonus-tag{font-family:var(--font-mono);color:var(--color-warning);font-size:.6875rem;font-weight:700;animation:2s infinite bonus-glow}@keyframes bonus-glow{0%,to{box-shadow:0 0 0 0 color-mix(in srgb, var(--color-highlight) 30%, transparent)}50%{box-shadow:0 0 0 6px color-mix(in srgb, var(--color-highlight) 0%, transparent)}}.quiz-bonus-tag.earned{background:linear-gradient(135deg, var(--color-positive), var(--color-positive))}@supports (color:color-mix(in lab, red, red)){.quiz-bonus-tag.earned{background:linear-gradient(135deg, color-mix(in srgb, var(--color-positive) 14%, transparent), color-mix(in srgb, var(--color-positive) 24%, transparent))}}.quiz-bonus-tag.earned{color:var(--color-positive);animation:none}.quiz-bonus-tag.missed{opacity:.4;text-decoration:line-through;animation:none}.lesson-section-badge--challenge{background:linear-gradient(135deg,#6a2ea029,#6a2ea029)}@supports (color:color-mix(in lab, red, red)){.lesson-section-badge--challenge{background:linear-gradient(135deg, color-mix(in srgb, var(--color-accent) 16%, transparent), color-mix(in srgb, var(--color-accent) 16%, transparent))}}.lesson-section-badge--challenge{color:var(--color-negative)}html[data-theme=dark] .lesson-section-badge--challenge{background:#6a2ea026}@supports (color:color-mix(in lab, red, red)){html[data-theme=dark] .lesson-section-badge--challenge{background:color-mix(in srgb, var(--color-accent) 15%, transparent)}}html[data-theme=dark] .lesson-section-badge--challenge{color:var(--color-negative)}.quiz-modal-backdrop{z-index:9990;background:#1d122699;position:fixed;inset:0}@supports (color:color-mix(in lab, red, red)){.quiz-modal-backdrop{background:color-mix(in srgb, var(--color-txt) 60%, transparent)}}.quiz-modal-backdrop{opacity:0;justify-content:center;align-items:center;padding:1rem;transition:opacity .3s;display:flex}.quiz-modal-backdrop.quiz-modal--visible{opacity:1}.quiz-modal-card{background:var(--color-card);border-left:4px solid var(--color-accent);width:100%;max-width:32rem;max-height:90vh;box-shadow:0 25px 50px var(--color-shade), 0 0 0 1px #6a2ea01a;border-radius:20px;padding:1.75rem;overflow-y:auto}@supports (color:color-mix(in lab, red, red)){.quiz-modal-card{box-shadow:0 25px 50px var(--color-shade), 0 0 0 1px color-mix(in srgb, var(--color-accent) 10%, transparent)}}.quiz-modal-card{opacity:0;transition:transform .4s cubic-bezier(.22,1,.36,1),opacity .4s;transform:translateY(2rem)scale(.96)}.quiz-modal--visible .quiz-modal-card{opacity:1;transform:translateY(0)scale(1)}.quiz-modal--exit .quiz-modal-card{opacity:0;transform:translateY(2rem)scale(.96)}.quiz-question>p{color:var(--color-txt);margin-bottom:0}.quiz-question>p+p{margin-top:.625rem}.quiz-modal-continue{width:100%;font-family:var(--font-sans);color:var(--color-accent-text);background:var(--color-accent);cursor:pointer;border:none;border-radius:12px;justify-content:center;align-items:center;gap:.5rem;padding:.875rem 1.5rem;font-size:.9375rem;font-weight:700;transition:all .2s;display:flex;box-shadow:0 2px 8px #6a2ea04d}@supports (color:color-mix(in lab, red, red)){.quiz-modal-continue{box-shadow:0 2px 8px color-mix(in srgb, var(--color-accent) 30%, transparent)}}.quiz-modal-continue:hover{transform:translateY(-1px);box-shadow:0 4px 16px #6a2ea066}@supports (color:color-mix(in lab, red, red)){.quiz-modal-continue:hover{box-shadow:0 4px 16px color-mix(in srgb, var(--color-accent) 40%, 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(max-width:640px){.quiz-modal-card{max-height:85vh;margin:.5rem;padding:1.25rem}}.lesson-particles{pointer-events:none;z-index:0;position:fixed;inset:0;overflow:hidden}.lesson-particle{opacity:0;border-radius:50%;animation:linear infinite lesson-float-particle;position:absolute}@keyframes lesson-float-particle{0%{opacity:0;transform:translateY(100vh)scale(0)}10%{opacity:.3}90%{opacity:.3}to{opacity:0;transform:translateY(-10vh)scale(1)}}.lesson-companion{z-index:25;cursor:pointer;filter:drop-shadow(0 4px 12px var(--color-shade));transition:transform .3s cubic-bezier(.34,1.56,.64,1);position:fixed;bottom:5.5rem;right:1.25rem}@supports (color:color-mix(in lab, red, red)){.lesson-companion{filter:drop-shadow(0 4px 12px color-mix(in srgb, var(--color-shade) 44%, transparent))}}.lesson-companion:hover{transform:scale(1.1)rotate(-5deg)}.lesson-companion-body{background:linear-gradient(135deg, var(--color-accent-soft), #ded1ea);border-radius:50%;width:3.5rem;height:3.5rem}@supports 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