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:root{--bg:#0a0e16;--surface-1:#111725;--surface-2:#161d2e;--surface-3:#1c2538;--border:#232c40;--border-strong:#303a52;--text:#e7ecf3;--muted:#9aa7bd;--subtle:#6b7890;--accent:#38bdf8;--accent-2:#6366f1;--accent-ink:#fff;--grad-accent:linear-gradient(135deg, var(--accent), var(--accent-2));--good:#34d399;--bad:#f87171;--focus-ring:#7dd3fc;--radius:14px;--radius-sm:10px;--radius-pill:999px;--shadow-1:0 1px 2px #0006;--shadow-2:0 12px 34px #0006;--glow-accent:0 0 0 1px color-mix(in srgb, var(--accent) 22%, transparent), 0 16px 50px color-mix(in srgb, var(--accent) 12%, transparent);--measure:66ch;--fs-body:1.0625rem;--fs-small:.875rem;--fs-h1:2.25rem;--fs-h2:1.5rem;--fs-h3:1.2rem;--font-body:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-head:var(--font-display), var(--font-body)}*{box-sizing:border-box}body{background:radial-gradient(1100px 520px at 50% -260px, color-mix(in srgb, var(--accent) 9%, transparent), transparent 70%), 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50ms;display:inline-flex}.btn:hover{background:var(--surface-2);border-color:var(--border-strong);text-decoration:none}.btn:active{transform:translateY(1px)}.btn-accent{background:var(--grad-accent);color:var(--accent-ink);box-shadow:var(--glow-accent);border:0}.btn-accent:hover{filter:brightness(1.08);background:var(--grad-accent)}.callout,.section-card{border:1px solid var(--border);background:var(--surface-1);border-radius:var(--radius);box-shadow:var(--shadow-1);margin:18px 0;padding:18px 20px;position:relative}.callout ul{margin:8px 0 0;padding-left:20px}.section-head{align-items:flex-start;gap:12px;margin-bottom:6px;display:flex}.section-head:not(:has(.section-title)){align-items:center}.section-head:not(:has(.section-title)) .eyebrow{margin-bottom:0}.section-head-text{min-width:0}.section-title{margin:0}.section-icon{background:color-mix(in srgb, var(--accent) 15%, var(--surface-2));width:38px;height:38px;color:var(--accent);border:1px solid color-mix(in srgb, var(--accent) 32%, transparent);border-radius:10px;flex:none;place-items:center;display:grid}.section-icon svg{width:20px;height:20px}.tint-indigo{--accent:#818cf8}.tint-good{--accent:var(--good)}.tint-amber{--accent:#fbbf24}.callout-takeaways{border-color:color-mix(in srgb, var(--good) 40%, var(--border));background:color-mix(in srgb, var(--good) 8%, var(--surface-1))}.key-terms{margin:10px 0 0}.key-term{border-top:1px solid var(--border);padding:8px 0}.key-term:first-child{border-top:0}.key-term dt{font-weight:600}.key-term dd{color:var(--muted);margin:2px 0 0}.card-list{margin:16px 0;padding:0;list-style:none}.card-list li{border:1px solid var(--border);background:var(--surface-1);border-radius:var(--radius);box-shadow:var(--shadow-1);margin-bottom:12px;padding:16px 18px;transition:border-color .15s,background .15s}.card-list li:hover{border-color:var(--border-strong);background:var(--surface-2)}.card-list li.row-done{border-color:color-mix(in srgb, var(--good) 45%, var(--border))}.card-list li.row-next{border-color:color-mix(in srgb, var(--accent) 50%, var(--border));box-shadow:0 0 0 1px color-mix(in srgb, var(--accent) 25%, transparent)}.check{width:1.4em;color:var(--good);display:inline-block}.breadcrumb{color:var(--muted);margin-bottom:10px;font-size:14px}.lesson-title-row{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.lesson-meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:14px;margin:8px 0 20px;font-size:14px;display:flex}.lesson-meta .meter{background:var(--border);border-radius:var(--radius-pill);flex:1;min-width:120px;max-width:240px;height:6px;overflow:hidden}.lesson-meta .meter>span{background:var(--grad-accent);height:100%;display:block}.badge{border:1px solid var(--border);border-radius:var(--radius-pill);color:var(--muted);align-items:center;gap:5px;padding:3px 11px;font-size:13px;font-weight:600;display:inline-flex}.badge-passed{border-color:color-mix(in srgb, var(--accent) 50%, transparent);color:var(--accent)}.badge-mastered{border-color:color-mix(in srgb, var(--good) 55%, transparent);color:var(--good)}.nav-row{justify-content:space-between;gap:10px;margin-top:36px;display:flex}.nav-row .spacer{flex:1}.lesson-video-stage{flex-direction:column;gap:14px;display:flex}.video-stage{width:100%;position:relative}:-webkit-any(.video-stage:fullscreen,.video-stage:-webkit-full-screen){background:#000;flex-direction:column;display:flex}:is(.video-stage:fullscreen,.video-stage:fullscreen){background:#000;flex-direction:column;display:flex}:-webkit-any(.video-stage:fullscreen .video-wrap,.video-stage:-webkit-full-screen .video-wrap){min-height:0;aspect-ratio:unset;box-shadow:none;border:0;border-radius:0;flex:1}:is(.video-stage:fullscreen .video-wrap,.video-stage:fullscreen .video-wrap){min-height:0;aspect-ratio:unset;box-shadow:none;border:0;border-radius:0;flex:1}.video-wrap{aspect-ratio:16/9;border-radius:var(--radius);border:1px solid var(--border);width:100%;box-shadow:var(--glow-accent);background:#000;position:relative;overflow:hidden}.video-wrap iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.video-wrap mux-player,.video-wrap .yt-host{width:100%;height:100%;position:absolute;inset:0}.video-footer{flex-direction:column;gap:10px;display:flex}.video-sidebar{align-items:start;gap:14px;display:grid}@media (min-width:768px){.video-sidebar:has(.video-chapters):has(.transcript){grid-template-columns:minmax(240px,320px) minmax(0,1fr)}.video-sidebar:not(:has(.video-chapters)) .transcript{max-width:66ch}}.video-sidebar .transcript{width:100%;min-width:0}.video-panel-head{font-family:var(--font-head);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 10px;font-size:.72rem;font-weight:700}.video-chapters{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface-1);box-shadow:var(--shadow-1);margin:0;padding:14px 16px}.video-chapters ol{flex-direction:column;gap:4px;margin:0;padding:0;list-style:none;display:flex}.video-chapters button{text-align:left;background:var(--surface-1);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;min-height:44px;color:inherit;cursor:pointer;align-items:center;gap:12px;padding:8px 12px;line-height:1.35;display:flex}.video-chapters button:hover{border-color:var(--accent)}.video-chapters button.is-active{border-color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, var(--surface-1))}.video-chapter-time{font-variant-numeric:tabular-nums;width:5ch;color:var(--muted);text-align:right;line-height:inherit;flex:none}.video-resume{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-1);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin:0;padding:12px 14px;display:flex}.video-resume-actions{gap:8px;display:flex}.transcript{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface-1);box-shadow:var(--shadow-1);padding:14px 16px}.transcript-cues{max-height:min(21vh,210px);margin:0;padding:4px;list-style:none;overflow-y:auto}.transcript-cues li{margin:0}.transcript-cues button{text-align:left;width:100%;color:inherit;cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:12px;padding:7px 8px;line-height:1.45;display:flex}.transcript-cues button:hover{background:var(--surface-2)}.transcript-cues button.is-active{background:color-mix(in srgb, var(--accent) 16%, transparent);box-shadow:inset 2px 0 0 var(--accent)}.transcript-time{font-variant-numeric:tabular-nums;width:5ch;color:var(--muted);text-align:right;line-height:inherit;flex:none}.video-check-overlay{z-index:10;background:#00000094;justify-content:center;align-items:center;padding:clamp(12px,3vw,24px);display:flex;position:absolute;inset:0}.video-check-overlay-panel{border:1px solid color-mix(in srgb, var(--accent) 35%, var(--border));border-left:3px solid var(--accent);border-radius:var(--radius-sm);background:var(--surface-1);width:min(100%,42rem);max-height:90%;box-shadow:var(--shadow-2);padding:14px 16px;overflow-y:auto}.video-check-overlay-panel .inline-check{box-shadow:none;margin:0}.inline-check{border:1px solid color-mix(in srgb, var(--accent) 35%, var(--border));background:color-mix(in srgb, var(--accent) 7%, var(--surface-1));border-radius:var(--radius);box-shadow:var(--shadow-1);margin:22px 0;padding:18px 20px}.inline-check-title{margin-bottom:10px;display:block}.inline-check-item+.inline-check-item{border-top:1px solid var(--border);margin-top:18px;padding-top:18px}.inline-check-prompt{margin:0 0 10px;font-weight:500}.inline-check-options{flex-direction:column;gap:8px;display:flex}.teach-back{border:1px solid var(--border);background:var(--surface-1);border-radius:var(--radius);box-shadow:var(--shadow-1);margin:22px 0;padding:18px 20px}.teach-back-prompt{margin:6px 0 10px}.teach-back-input{background:var(--bg);width:100%;color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);font:inherit;resize:vertical;padding:11px 13px}.teach-back-input:focus{border-color:var(--accent)}.assess{border:1px solid color-mix(in srgb, var(--good) 45%, var(--border));background:color-mix(in srgb, var(--good) 7%, var(--surface-1));border-radius:var(--radius);box-shadow:var(--shadow-1);margin:30px 0;padding:20px 22px}.assess h2{margin:0 0 4px}.flashcard{border:1px solid var(--border);background:var(--surface-1);border-radius:var(--radius);text-align:center;white-space:pre-wrap;min-height:120px;box-shadow:var(--shadow-1);justify-content:center;align-items:center;padding:28px 20px;font-size:19px;display:flex}.flashcard-back{background:var(--surface-2);margin-top:10px}.rating-row{gap:8px;margin-top:14px;display:flex}.rating-row .btn{flex-direction:column;flex:1;align-items:center;gap:2px;display:flex}.rating-interval{color:var(--muted);font-size:12px}.review-progress{background:var(--border);border-radius:var(--radius-pill);height:6px;margin:4px 0 8px;overflow:hidden}.review-progress>span{background:var(--grad-accent);height:100%;transition:width .2s;display:block}.progress{background:var(--border);border-radius:var(--radius-pill);height:8px;margin:10px 0;overflow:hidden}.progress>span{background:var(--grad-accent);height:100%;transition:width .2s;display:block}.quiz-option{text-align:left;border:1px solid var(--border);background:var(--surface-1);color:var(--text);border-radius:var(--radius-sm);cursor:pointer;min-height:44px;padding:12px 14px;font-size:15px}.quiz-option:hover{border-color:var(--border-strong)}.quiz-option.is-selected{border-color:var(--accent);background:color-mix(in srgb, var(--accent) 10%, var(--surface-1))}.quiz-option.is-correct{border-color:var(--good);background:color-mix(in srgb, var(--good) 18%, var(--surface-1))}.quiz-option.is-wrong{border-color:var(--bad);background:color-mix(in srgb, var(--bad) 18%, var(--surface-1))}.quiz-feedback{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-2);margin-top:14px;padding:12px 14px}.review-banner{border:1px solid color-mix(in srgb, var(--accent) 40%, var(--border));background:color-mix(in srgb, var(--accent) 12%, var(--surface-1));border-radius:var(--radius);color:var(--text);box-shadow:var(--shadow-1);justify-content:space-between;align-items:center;margin:8px 0 24px;padding:16px 18px;display:flex}.review-banner:hover{border-color:var(--accent);text-decoration:none}.module-title{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:30px 0 10px;font-size:14px}.streak-strip{align-items:center;gap:12px;padding:14px 4px;display:flex}.streak-flame{font-size:24px;line-height:1}.muted{color:var(--muted)}.lesson-footer{border-top:1px solid var(--border);flex-direction:column;align-items:flex-start;gap:12px;margin-top:44px;padding-top:22px;display:flex}.legal-line{font-size:var(--fs-small);color:var(--subtle);margin:0}:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px;border-radius:4px}:focus:not(:focus-visible){outline:none}.skip-link{z-index:100;position:absolute;top:0;left:-9999px}.skip-link:focus{background:var(--surface-2);color:var(--text);border:1px solid var(--accent);border-radius:var(--radius-sm);padding:10px 14px;top:8px;left:8px}.lesson-completion-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}@media (max-width:600px){:root{--fs-h1:1.9rem}.container{padding:18px 14px 72px}.nav-row{flex-direction:column-reverse}.nav-row .btn{width:100%}.nav-row .spacer{display:none}.rating-row{flex-wrap:wrap}}[data-slot=smooth-corners][data-state=pending]{opacity:0}[data-slot=smooth-corners][data-state=ready]{opacity:1;transition:opacity 80ms}.home-stat-chips>div{min-width:0}.home-page{min-height:calc(100vh - 57px);position:relative}.home-atmosphere{pointer-events:none;background:radial-gradient(ellipse 90% 55% at 8% -5%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 58%), radial-gradient(ellipse 55% 45% at 92% 8%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 52%), radial-gradient(ellipse 70% 40% at 50% 100%, color-mix(in srgb, var(--accent-2) 6%, transparent), transparent);z-index:0;position:absolute;inset:0}.home-container{z-index:1;max-width:1080px;padding-bottom:48px;position:relative}.topbar-glass{background:color-mix(in srgb, var(--bg) 65%, transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom-color:color-mix(in srgb, var(--border) 80%, transparent)}.topbar-brand,.topbar-back{color:var(--text);font-weight:700;text-decoration:none}.topbar-user{align-items:center;gap:10px;display:inline-flex}.topbar-avatar{object-fit:cover;border-radius:50%;width:32px;height:32px}.topbar-avatar-fallback{background:var(--surface-2);border:1px solid var(--border);justify-content:center;align-items:center;font-size:14px;font-weight:700;display:inline-flex}.topbar-username{font-size:14px}.topbar-chevron{width:14px;height:14px;color:var(--subtle);flex-shrink:0}.topbar-logout{gap:6px}.topbar-logout-icon{width:15px;height:15px}.btn-ghost-sm{min-height:36px;padding:6px 12px;font-size:.875rem}.btn-cta{transition:transform .35s,filter .35s,opacity .35s}.btn-cta:hover{transition-delay:60ms}.home-hero{margin:32px 0 24px}.home-hero-eyebrow{margin-bottom:10px}.home-hero-title{letter-spacing:-.02em;max-width:18ch;margin:0;font-size:clamp(1.85rem,4.5vw,2.5rem);line-height:1.12}.home-hero-sub{max-width:36ch;margin:12px 0 0;font-size:1.02rem;line-height:1.5}.home-stat-chips{grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:24px;display:grid}@media (max-width:720px){.home-stat-chips{grid-template-columns:1fr}}.stat-chip{background:color-mix(in srgb, var(--surface-1) 88%, transparent);border:1px solid color-mix(in srgb, var(--border) 90%, transparent);min-height:60px;box-shadow:var(--shadow-1);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);flex-direction:row;align-items:center;gap:12px;padding:14px 16px;transition:transform .12s,border-color .15s,box-shadow .15s;display:flex}.stat-chip:hover{border-color:var(--border-strong)}.stat-chip-icon-well{border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:42px;height:42px;display:inline-flex}.stat-chip-icon-well svg{width:20px;height:20px}.stat-chip-icon-well-cyan{color:var(--accent);background:color-mix(in srgb, var(--accent) 14%, var(--surface-2));box-shadow:0 0 20px color-mix(in srgb, var(--accent) 25%, 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var(--surface-2))}.home-status-strip-text{flex-direction:column;gap:2px;min-width:0;display:flex}.home-status-strip-title{color:var(--text);font-size:.9rem;font-weight:700}.home-status-strip-sub{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;font-size:.82rem;overflow:hidden}.course-page{padding-top:24px;padding-bottom:48px}.course-hero{background:linear-gradient(160deg,#0c1424 0%,#121a2e 55%,#0a0f18 100%);align-items:flex-end;min-height:clamp(240px,38vw,420px);margin-bottom:0;display:flex;position:relative;overflow:hidden}.course-hero-media{position:absolute;inset:0}.course-hero-media .course-card-v2-cover-fallback{height:100%;position:absolute;inset:0}.course-hero-img{object-fit:cover;object-position:center 35%}.course-hero-scrim{pointer-events:none;background:linear-gradient(180deg, color-mix(in srgb, var(--bg) 25%, transparent) 0%, transparent 35%, color-mix(in srgb, var(--bg) 55%, transparent) 68%, color-mix(in srgb, var(--bg) 92%, transparent) 100%), linear-gradient(90deg, color-mix(in srgb, var(--bg) 40%, transparent) 0%, transparent 55%);position:absolute;inset:0}.course-hero-content{z-index:1;width:100%;padding-top:clamp(120px,22vw,200px);padding-bottom:clamp(28px,5vw,44px);position:relative}.course-hero-content h1{letter-spacing:-.02em;max-width:16ch;text-shadow:0 2px 24px color-mix(in srgb, var(--bg) 75%, transparent);margin:0 0 10px;font-size:clamp(2rem,5vw,2.75rem);line-height:1.08}.course-hero-tagline{max-width:48ch;color:color-mix(in srgb, var(--text) 88%, var(--muted));text-shadow:0 1px 12px color-mix(in srgb, var(--bg) 80%, transparent);margin:0;font-size:clamp(1rem,2.2vw,1.12rem);line-height:1.5}.course-continue-wrap{margin:0 0 28px}.course-continue-pill{color:var(--text);background:color-mix(in srgb, var(--accent) 12%, var(--surface-2));border:1px solid color-mix(in srgb, var(--accent) 35%, var(--border));align-items:center;gap:8px;padding:10px 16px;font-size:.9rem;text-decoration:none;transition:border-color 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18px;text-decoration:none;transition:background .15s;display:flex}.lesson-module-row-link:hover{background:color-mix(in srgb, var(--surface-2) 80%, transparent)}.lesson-module-row-link:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.lesson-module-row-next .lesson-module-row-link{background:color-mix(in srgb, var(--accent) 6%, transparent);box-shadow:inset 3px 0 0 var(--accent)}.lesson-module-row-next .lesson-module-row-link:hover{background:color-mix(in srgb, var(--accent) 10%, transparent)}.lesson-module-row-done .lesson-module-title{color:color-mix(in srgb, var(--text) 88%, var(--muted))}.lesson-module-title{flex:1;min-width:0;font-weight:500}.lesson-module-icon{flex-shrink:0}.lesson-module-icon-passed{color:var(--good)}.lesson-module-icon-mastered{color:color-mix(in srgb, var(--accent) 70%, 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0;font-size:.9rem}.course-progress-segmented{border-radius:var(--radius-pill);background:var(--surface-3);gap:2px;height:10px;display:flex;overflow:hidden}.course-progress-segmented-endowed:before{content:"";background:color-mix(in srgb, var(--accent) 25%, transparent);border-radius:var(--radius-pill);width:10%;height:10px;position:absolute}.course-progress-segmented{position:relative}.course-progress-seg-passed{background:var(--grad-accent);min-width:0}.course-progress-seg-checked{background:color-mix(in srgb, var(--muted) 40%, var(--surface-2));min-width:0}.course-progress-seg-remaining{background:0 0;min-width:0}.course-progress-caption{margin:10px 0 0;font-size:.88rem}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}