.ssp{--ssp-ink:#171A21;--ssp-body:#3D4358;--ssp-muted:#5A6078;--ssp-line:#D5D9EC;--ssp-navy:#060D87;--ssp-gold:#F4B142;width:100%;background:#fff;border:1px solid var(--ssp-line);box-shadow:0 14px 34px rgba(6,13,135,.16);color:var(--ssp-ink);text-align:left;font-size:14px;line-height:1.35;letter-spacing:0;color-scheme:light}.ssp,.ssp *,.ssp :after,.ssp :before{box-sizing:border-box}.ssp [hidden]{display:none!important}.ssp-stage{position:relative;aspect-ratio:16/9;overflow:hidden}.ssp-stage,.ssp-video{width:100%;background:#fff}.ssp-video{display:block;height:100%;object-fit:cover;cursor:pointer}.ssp-video:focus-visible{outline:3px solid var(--ssp-gold);outline-offset:-3px}.ssp button{font-family:inherit}.ssp-sound{position:absolute;right:10px;bottom:14px;height:44px;min-width:44px;padding:0 12px;display:flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:10px;background:var(--ssp-ink);color:#fff;font-size:14px;font-weight:600;line-height:1;cursor:pointer}.ssp[data-keep-credit=true] .ssp-sound{top:10px;bottom:auto}.ssp-cta svg,.ssp-play svg,.ssp-replay svg,.ssp-sound svg{flex:none;display:block}.ssp-play{position:absolute;left:50%;top:50%;width:60px;height:60px;margin:-30px 0 0 -30px;display:flex;align-items:center;justify-content:center;border:0;border-radius:12px;background:var(--ssp-ink);color:#fff;cursor:pointer}.ssp-cta:focus-visible,.ssp-play:focus-visible,.ssp-replay:focus-visible,.ssp-sound:focus-visible,.ssp-switch button:focus-visible{outline:3px solid var(--ssp-gold);outline-offset:2px}.ssp-bar{position:absolute;left:0;bottom:0;height:4px;width:0;background:var(--ssp-gold);pointer-events:none}.ssp-end{inset:0;padding:14px 16px 16px;background:rgba(6,13,135,.95);flex-direction:column;justify-content:flex-end;gap:6px}.ssp-end,.ssp-replay{position:absolute;color:#fff;display:flex}.ssp-replay{top:8px;right:8px;width:44px;height:44px;align-items:center;justify-content:center;border:0;border-radius:10px;background:rgba(255,255,255,.14);cursor:pointer}.ssp .ssp-end-title{margin:0;padding-right:52px;font-family:var(--ssp-display,inherit);font-size:21px;font-weight:700;line-height:1.1;letter-spacing:-.02em;color:#fff}.ssp .ssp-end-sub{margin:0;font-size:13px;line-height:1.35;color:#D9DCF7}.ssp a.ssp-cta{margin-top:6px;height:48px;align-items:center;gap:8px;border-radius:10px;background:var(--ssp-gold);color:var(--ssp-ink);font-size:16px;font-weight:700;text-decoration:none}.ssp a.ssp-cta,.ssp-caps{display:flex;justify-content:center}.ssp-caps{height:98px;padding:10px 16px;background:var(--ssp-navy);color:#fff;flex-direction:column;gap:3px;text-align:center;overflow:hidden}.ssp .ssp-cap1{margin:0;font-size:15px;line-height:1.35;font-weight:600;color:#fff}.ssp[data-captions=both] .ssp-cap1,.ssp[data-captions=zh] .ssp-cap1{font-size:16px}.ssp .ssp-cap2{margin:0;font-size:13px;line-height:1.35;color:#D9DCF7}.ssp-meta{padding:10px 10px 10px 16px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 12px}.ssp .ssp-topic{flex:1 1 150px;min-width:0;margin:0;font-size:13.5px;line-height:1.35;color:var(--ssp-body)}.ssp-topic b{font-weight:700}.ssp [data-paper=CHEM191]{color:#98481F}.ssp [data-paper=HUBS191]{color:#9B3A70}.ssp [data-paper=CELS191]{color:#0F6E82}.ssp [data-paper=PHSI191]{color:#1E5AA8}.ssp-switch{flex:none;display:flex;gap:2px;padding:2px;border:1px solid var(--ssp-line);border-radius:10px;background:#fff}.ssp-switch button{height:44px;min-width:46px;padding:0 8px;border:0;border-radius:8px;cursor:pointer;font-size:14px;font-weight:500;background:transparent;color:#4A5068}.ssp-switch button[aria-pressed=true]{background:#E3E7FB;color:var(--ssp-navy);font-weight:700}.ssp-by{margin:0 16px;padding:10px 0 13px;border-top:1px solid #e6e8f2;display:flex;flex-direction:column;gap:2px}.ssp .ssp-who{margin:0;font-size:14px;line-height:1.35;color:var(--ssp-body)}.ssp-who b{font-weight:700;color:var(--ssp-ink)}.ssp .ssp-teaches{margin:0;font-size:12.5px;line-height:1.4;color:var(--ssp-muted)}.ssp-sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.ssp-poster{color:#171A21;text-decoration:none;text-align:left}.ssp-poster,.ssp-poster-frame{position:relative;display:block;background:#fff}.ssp-poster-frame{aspect-ratio:16/9;overflow:hidden}.ssp-poster-frame img{display:block;width:100%;height:100%;object-fit:cover}.ssp-poster-mark{position:absolute;left:50%;top:50%;width:52px;height:52px;margin:-26px 0 0 -26px;display:flex;align-items:center;justify-content:center;border-radius:12px;background:#171A21;color:#fff}.ssp-poster-line{display:block;padding:9px 12px;font-size:13.5px;line-height:1.35;color:#171A21}.ssp-poster-line b{font-weight:700}.ssp-poster-by{display:block;margin:0 12px;padding:9px 0 11px;border-top:1px solid #e6e8f2}.ssp-poster-by span{display:block}.ssp-poster-who{font-size:14px;line-height:1.35;color:#3D4358}.ssp-poster-who b{font-weight:700;color:#171A21}.ssp-poster-teaches{margin-top:2px;font-size:12.5px;line-height:1.4;color:#5A6078}.ssp-poster [data-paper=CHEM191]{color:#98481F}.ssp-poster [data-paper=HUBS191]{color:#9B3A70}