:root{color-scheme:dark;font-family:Arial,Helvetica,sans-serif;background:#07151d;color:#edf6f4;font-synthesis:none;--muted:#b6ccd3;--accent:#9ce4d9;--line:#304955;--gold:#f1d09a}
*{box-sizing:border-box}html{scroll-padding-top:22px}body{margin:0}a{color:var(--accent);text-underline-offset:4px}button,input{font:inherit}button,a,input,video{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,video:focus-visible{outline:3px solid var(--gold);outline-offset:5px}a:hover{color:#d4fff5}.skip-link{position:absolute;z-index:5;top:10px;left:10px;background:#effbf7;color:#092a31;padding:14px;transform:translateY(-160%)}.skip-link:focus{transform:none}.site-header{max-width:1600px;margin:auto;padding:25px 4%;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line)}.brand{font-weight:700;font-size:22px;letter-spacing:.5px;color:var(--accent)}main{max-width:1520px;margin:auto;padding:32px 4% 44px}.intro{max-width:910px;margin-bottom:28px}.eyebrow{font-size:12px;letter-spacing:2.4px;color:var(--accent);margin:0 0 12px}h1{font-size:clamp(32px,4.2vw,56px);letter-spacing:-1.5px;line-height:1.13;margin:0 0 16px}h2{font-size:24px;line-height:1.3;margin:0}h3{font-size:20px;line-height:1.5;margin:0 0 12px}.lede{font-size:18px;line-height:1.65;color:#c9dce0;margin:0}.lesson-meta{display:flex;align-items:center;flex-wrap:wrap;gap:10px 22px;color:#a4bdc7;font-size:13px;line-height:1.5;margin-top:20px}.lesson-meta span+span:before{content:"·";margin-right:22px;color:#88a5b1}.film-figure{margin:0}.film-figure video{display:block;width:100%;aspect-ratio:16/9;object-fit:contain;background:#02090d;border:1px solid var(--line);border-radius:12px}.film-figure figcaption{font-size:13px;color:var(--muted);line-height:1.6;margin-top:13px;max-width:1050px}.player-tools{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:10px}.caption-toggle{display:flex;align-items:center;gap:10px;min-height:44px;font-size:14px;cursor:pointer;flex-shrink:0}.caption-toggle input{width:19px;height:19px;accent-color:var(--accent);cursor:pointer}.small{font-size:13px;color:var(--muted);line-height:1.6;margin:0}.status{font-size:14px;color:#d7e9ed;line-height:1.55;min-height:22px;margin:7px 0 0}.status[data-state=unavailable]{color:var(--gold)}.chapters{margin-top:30px;padding-top:25px;border-top:1px solid var(--line)}.section-heading{display:flex;align-items:baseline;justify-content:space-between;gap:18px;margin-bottom:10px}.section-heading>span,.section-heading>a{font-size:13px;color:var(--muted)}.chapters ol{padding:0;list-style:none;margin:18px 0 0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.chapters button{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:12px;width:100%;height:100%;align-items:center;text-align:left;background:#102733;border:1px solid #38545f;color:#e3f0ef;border-radius:9px;padding:16px 14px;cursor:pointer;min-height:80px}.chapters button:hover:not(:disabled){background:#193c48;border-color:#75bab8}.chapters button[aria-current=true]{background:#153b42;border-color:var(--accent);box-shadow:inset 3px 0 0 var(--accent)}.chapters button:disabled{cursor:default}.chapters button:disabled .chapter-time{color:#819ba6}.chapter-number{font-size:12px;letter-spacing:1px;color:var(--accent)}.chapter-title{font-size:14px;font-weight:600;line-height:1.5}.chapter-time{font-size:12px;color:#b4ccd5;font-variant-numeric:tabular-nums;white-space:nowrap}.transcript{max-width:870px;margin:42px auto 0}.transcript-intro{font-size:15px;color:var(--muted);line-height:1.6;margin:12px 0 30px}.transcript-section{margin:0 0 30px;scroll-margin-top:24px}.transcript-section p{font-size:17px;line-height:1.85;color:#ccdee3;margin:0}.section-number{font-size:12px;vertical-align:middle;color:var(--accent);margin-right:8px;letter-spacing:1px}.transcript-time{display:inline-block;font-size:13px;white-space:nowrap;font-weight:400;color:#a7c1cb;margin-left:7px;font-variant-numeric:tabular-nums}.model-note{max-width:870px;margin:38px auto 0;background:#0d2430;border-left:3px solid #8bd5cc;border-radius:0 8px 8px 0;padding:22px 25px}.model-note h2{font-size:17px}.model-note p{font-size:14px;line-height:1.75;color:var(--muted);margin:10px 0 0}footer{max-width:1400px;margin:auto;padding:22px 4% 32px;border-top:1px solid #28414b;font-size:12px;color:#9bb6c2}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}
.video-shell{background:#02090d;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.brand{text-decoration:none}
.site-links{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px;font-size:14px;line-height:1.5}
.site-links a{min-height:44px;display:inline-flex;align-items:center}
@media(max-width:620px){.site-header{flex-wrap:wrap}.site-links{flex-basis:100%;gap:10px 22px;font-size:13px}}
.film-figure video{aspect-ratio:16/10.5;object-position:center top;border:0;border-radius:0}
.caption-band{min-height:82px;padding:12px 20px;display:grid;place-items:center;background:#051017;border-top:1px solid #1d3440}
.caption-band p{margin:0;color:#fff;font:18px/1.35 Arial,Helvetica,sans-serif;white-space:pre-line;text-align:center;max-width:100%}
.fullscreen-toggle{min-height:44px;padding:9px 15px;color:var(--accent);background:#102733;border:1px solid #46616b;border-radius:7px;cursor:pointer}
.fullscreen-toggle:hover{background:#193c48}
#loading-progress{display:block;width:min(100%,28rem);height:8px;margin:12px 0 16px;accent-color:var(--accent)}
.retry-video{min-height:44px;padding:10px 16px;margin:8px 0;color:var(--accent);background:#102733;border:1px solid #46616b;border-radius:7px;cursor:pointer}
.retry-video:hover{background:#193c48}
.fullscreen-exit{display:none}
.player-tools>.small{margin-left:auto}
.video-shell:fullscreen{position:relative;width:100vw;height:100vh;display:flex;flex-direction:column;background:#02090d;border:0;border-radius:0}
.video-shell:fullscreen .fullscreen-exit{display:block;position:absolute;top:16px;right:16px;z-index:2;padding:12px 16px;font:16px Arial,sans-serif;color:#e9faf4;background:#102733;border:1px solid #46616b;border-radius:7px;cursor:pointer}
.video-shell:fullscreen video{height:calc(100vh - 124px)!important;min-height:0;width:100%;aspect-ratio:auto;object-fit:contain;object-position:center top;flex:1}
.video-shell:fullscreen .caption-band{height:124px;min-height:124px;flex:none;padding:12px 36px}
.video-shell:fullscreen .caption-band p{font-size:clamp(16px,2.64vw,36px);line-height:1.3}
.film-figure video::-webkit-media-controls-fullscreen-button{display:none}
@media(max-width:560px){.caption-band{min-height:98px;padding:12px}.caption-band p{font-size:16px}.player-tools>.small{flex-basis:100%;margin-top:5px}.video-shell:fullscreen .caption-band p{font-size:clamp(16px,3vw,36px)}}
@media(min-width:1600px){main{padding-left:40px;padding-right:40px}}
@media(max-width:900px){.chapters ol{grid-template-columns:repeat(2,minmax(0,1fr))}.player-tools{align-items:flex-start;justify-content:flex-start;flex-wrap:wrap;gap:0 20px}.player-tools>.small{max-width:530px}.section-heading>span{display:none}}
@media(max-width:560px){.site-header{padding:19px 5%;gap:14px}.brand{font-size:19px}main{padding:26px 5% 32px}h1{letter-spacing:-1px}h2{font-size:22px}.lede{font-size:16px}.lesson-meta{gap:9px 15px}.lesson-meta span+span:before{margin-right:15px}.film-figure video{border-radius:7px}.chapters{margin-top:24px;padding-top:22px}.chapters ol{grid-template-columns:1fr;gap:8px}.chapters button{min-height:64px;padding:12px 14px}.chapter-title{font-size:14px}.section-heading{align-items:center}.section-heading>a{font-size:12px}.transcript{margin-top:32px}.transcript-section p{font-size:16px;line-height:1.85}h3{font-size:18px}.model-note{padding:20px}.film-figure figcaption{font-size:12px}.player-tools>.small{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media(max-height:500px) and (orientation:landscape){.video-shell:fullscreen video{height:calc(100vh - 88px)!important;max-width:calc((100vh - 152px) * 16 / 9);align-self:center}.video-shell:fullscreen .caption-band{height:88px;min-height:88px;padding:12px 24px}}