@font-face{font-family:'Course Sans';src:url('/NotoSansKR.woff') format('woff');font-style:normal;font-weight:100 900;font-display:swap}
:root{font-family:'Course Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;--ink:#212529;--green:#425abd;--lime:#eef1fb;--line:#e9ecef;--muted:#868e96;color:var(--ink);background:#fff;letter-spacing:-.025em;font-synthesis:none}
body,.catalog-page{background:#fff;color:#212529;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;letter-spacing:inherit}h1,h2,h3,strong,b{letter-spacing:-.035em}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid #4962ce;outline-offset:3px}a{transition:color .15s}a:hover{color:#425abd}.offer-strip,.catalog-offer{min-height:44px;padding:10px 20px;background:#eef1fb;color:#43588f;font-size:13px;gap:12px;letter-spacing:-.02em}.offer-strip span,.catalog-page .offer-strip span{border-color:#c5cee9;font-weight:600}.offer-strip b{font-weight:600}.offer-strip i{display:none}.nav-shell,.nav-shell .nav{background:#fff;border-color:#f1f3f5}.nav-shell{border-bottom:1px solid #f1f3f5}.nav,.catalog-page .nav{max-width:1200px;height:68px;margin:0 auto;gap:35px}.wordmark,.nav-shell .wordmark,.catalog-page .wordmark{font-family:inherit;color:#425abd;font-size:22px;font-weight:750;letter-spacing:-.05em;gap:9px;white-space:nowrap}.brand-icon{width:27px;height:27px;stroke-width:2;flex-shrink:0}.brand-symbol{display:none}.nav-links{flex:1;gap:28px;font-size:15px;font-weight:600}.nav-links>a:first-child,.nav-links .nav-courses{display:block;color:#343a40;font-weight:600}.nav-links .nav-buy{margin-left:auto;border:1px solid #dee2e6;border-radius:5px;padding:9px 14px;font-size:14px;font-weight:500;color:#495057}.nav-links .nav-buy:hover{border-color:#4962ce;color:#425abd}.store-main,.footer{max-width:1200px;margin-left:auto;margin-right:auto}.button{min-height:44px;border-radius:5px;font-size:14px;padding:11px 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p{font-size:13px;line-height:1.8;color:#73819e}.catalog-promo>a{margin-top:auto;align-self:flex-start;background:#fff;border:1px solid #c8d1ee;border-radius:5px;font-size:13px;font-weight:650;color:#425abd;padding:9px 13px}.lecture-card{background:#fff;min-width:0}.lecture-cover{aspect-ratio:16/10;border:0;border-radius:6px;box-shadow:none;display:flex;align-items:center}.lecture-cover:hover{filter:none;box-shadow:0 3px 12px #1b252817}.cover-reading{background:#273653;color:white}.cover-math{background:#f8eee4;color:#795d40}.cover-english{background:#eaf0fa;color:#405778}.thumbnail-content{position:relative;padding:24px 20px;z-index:1;display:flex;flex-direction:column;gap:7px}.thumbnail-series{font-size:12px;font-weight:500;letter-spacing:-.02em;opacity:.7}.thumbnail-content>strong{font-size:32px;line-height:1.25;font-weight:780;letter-spacing:-.055em}.cover-reading 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@media(max-width:1280px){.nav,.catalog-page .nav,.store-main,.footer{margin-left:32px;margin-right:32px}.catalog-grid{gap:16px}.catalog-promo{padding:25px 20px}.catalog-promo h2{font-size:26px}.thumbnail-content{padding:20px 18px}.thumbnail-content>strong{font-size:30px}.thumbnail-mark{right:10px}.lecture-card h3{font-size:15px}}
@media(max-width:1000px){.catalog-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.catalog-promo{grid-column:1/-1;min-height:0;max-height:none;display:grid;grid-template-columns:1fr auto;gap:6px 24px;padding:20px 24px}.promo-label{grid-column:1}.catalog-promo h2{grid-column:1;font-size:22px;line-height:1.5;margin:0}.catalog-promo h2 br{display:none}.catalog-promo h2 br::after{content:' '}.catalog-promo h2 em{margin-left:5px}.catalog-promo p{display:none}.catalog-promo>a{grid-column:2;grid-row:1/3;margin:0;align-self:center}.lecture-cover{aspect-ratio:16/11}.thumbnail-mark svg{width:52px;height:52px}}
@media(max-width:760px){.nav,.catalog-page .nav,.store-main,.footer{margin-left:20px;margin-right:20px}.nav,.catalog-page .nav{height:62px;gap:20px}.wordmark,.nav-shell .wordmark,.catalog-page .wordmark{font-size:19px;gap:6px}.brand-icon{width:22px;height:22px}.nav-links{gap:12px}.nav-links .nav-courses{display:none}.nav-links .nav-buy{font-size:12px;padding:8px 10px}.offer-strip,.catalog-offer{font-size:11px;min-height:40px;gap:7px;padding:9px 12px}.offer-strip span,.catalog-page .offer-strip span{padding-right:7px}.catalog-main{padding:23px 0 28px;min-height:calc(100vh - 194px)}.catalog-top{display:flex;margin-bottom:12px}.catalog-search{width:100%;padding-left:16px;min-height:43px}.catalog-search input{font-size:13px}.catalog-search button{width:32px;height:32px}.catalog-categories{justify-content:flex-start;gap:14px;margin-bottom:23px}.catalog-categories button{min-width:58px;padding:15px 10px 12px;font-size:12px;flex:initial;gap:7px}.catalog-categories button svg{width:21px;height:21px}.catalog-results-heading{align-items:center;margin-bottom:15px;gap:9px}.catalog-results-heading h2{font-size:16px;padding:0}.catalog-results-heading h2 span{font-size:12px;margin-left:4px}.catalog-status-filters{gap:0}.catalog-status-filters button{font-size:11px;padding:5px 7px}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 14px}.catalog-promo{padding:19px;gap:4px 13px;border-radius:5px}.promo-label{font-size:11px}.catalog-promo h2{font-size:18px;line-height:1.6;word-break:keep-all}.catalog-promo h2 br:first-of-type{display:block}.catalog-promo h2 em{margin-left:4px}.catalog-promo>a{font-size:11px;padding:8px 9px}.lecture-cover{aspect-ratio:16/11;border-radius:5px}.thumbnail-content{padding:18px 13px;gap:4px}.thumbnail-series{font-size:10px}.thumbnail-content>strong{font-size:27px;line-height:1.3}.thumbnail-caption{font-size:9px;max-width:113px;margin-top:5px;line-height:1.5}.thumbnail-mark{right:5px;bottom:15px}.thumbnail-mark svg{width:38px;height:38px}.cover-reading .thumbnail-mark{right:6px;bottom:20px}.cover-badge,.cover-badge.coming{top:6px;right:6px;font-size:9px;padding:2px 5px}.thumbnail-duration{bottom:6px;right:6px;font-size:9px;padding:1px 4px}.lecture-card h3{font-size:14px;line-height:1.6;word-break:keep-all}.lecture-card-content{padding-top:10px}.lecture-series{font-size:12px;margin-top:4px}.lecture-meta{font-size:11px;margin-top:4px;line-height:1.7}.lecture-price{display:block;margin-top:8px}.lecture-price strong,.lecture-price strong.upcoming-price{font-size:15px}.lecture-price>span{display:block;font-size:11px;margin-top:3px;line-height:1.7}.lecture-card-bottom{align-items:flex-start;flex-direction:column;gap:5px;margin-top:9px}.lecture-chip,.upcoming-chip{font-size:9px;padding:3px 5px}.lecture-action{font-size:12px}.catalog-footnote{font-size:11px;line-height:1.8;margin-top:24px}.footer{min-height:80px;gap:13px 19px;padding:24px 0;flex-wrap:wrap}.footer .wordmark{font-size:15px;width:100%}.footer>a:not(.wordmark),.footer>a:last-child{font-size:12px;width:auto}.footer>a:nth-child(2){margin-left:0}.back-link{font-size:12px;margin:21px 0}}
@media(prefers-reduced-motion:reduce){a{transition:none}}

/* Shared learning and account screens. */
.course{max-width:1200px;margin:0 auto 52px}.course>.back-link{margin:25px 0}.course-heading{margin:0 0 22px;gap:20px}.course-heading h1{font-size:26px;letter-spacing:-.035em;line-height:1.5;font-weight:700}.course-heading p{font-size:13px;color:#868e96;margin-top:7px}.course-heading p span{border-color:#dee2e6;margin-left:10px;padding-left:10px}.status{font-size:12px;color:#425abd;background:#eef1fb;padding:6px 10px;border-radius:4px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;align-items:start;gap:24px;margin:0}.course .player-shell{background:#111;border:1px solid #212529;border-radius:5px}.video-state{color:#dee2e6;font-size:13px;padding:14px 18px}.player-bar{padding:16px 0;gap:20px;min-height:74px}.player-bar p{font-size:13px;color:#868e96;line-height:1.7}#play-button{min-height:40px;min-width:100px;border-radius:5px;font-size:13px;font-weight:650;background:#4962ce;padding:9px 16px}#play-button:hover:not(:disabled){background:#3b52b5}.transcript-panel{margin:0;border:1px solid #e9ecef;border-radius:5px;background:#fff}.transcript-panel>summary{color:#343a40;font-size:14px;font-weight:650;padding:16px 18px}.transcript-panel[open]>summary{border-color:#e9ecef}.transcript-body{height:414px;background:#fff}.transcript-header{height:49px;padding:0 16px}.transcript-header h2{font-size:13px;font-weight:500;color:#868e96}.transcript-help{font-size:11px;color:#868e96;margin:0 16px 12px;line-height:1.7}#follow-button{border-color:#c8d1ee;background:#eef1fb;color:#425abd;font-size:11px;font-weight:500;padding:6px 8px;border-radius:4px}#follow-button[aria-pressed=false]{color:#868e96;border-color:#dee2e6;background:#fff}#transcript-scroll{top:76px;scrollbar-color:#ced4da transparent;padding:0 8px 12px}#transcript-scroll:focus-visible{outline-color:#4962ce}#transcript-status{color:#868e96;font-size:13px}.cue{grid-template-columns:34px minmax(0,1fr);font-size:14px;line-height:1.85;padding:12px 9px;gap:7px;color:#6b7278;font-weight:400;border-left-width:2px;border-radius:3px;letter-spacing:-.025em}.cue time{font-size:10px;line-height:2.6;color:#adb5bd}.cue:hover{color:#343a40;background:#f8f9fa}.cue[aria-current=true]{color:#30479f;background:#eef1fb;border-left-color:#4962ce;font-weight:550}.cue[aria-current=true] time{color:#425abd}.course .analytics-privacy{color:#adb5bd;font-size:11px;margin:4px 0 24px}.price-row{border-color:#e9ecef;padding-top:22px;margin-bottom:0;gap:20px}.price-main{font-size:14px;gap:12px;color:#495057}.price-main strong{font-size:24px;color:#425abd;font-weight:700}.later{color:#868e96;font-size:13px;margin-left:0}.later b{color:#495057}.price-notes{color:#868e96;font-size:12px;line-height:1.8}
.notification-main{max-width:1000px}.notification-layout{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:65px;margin:15px 0 64px}.notification-intro{padding:25px 0 0}.notification-intro h1{font-size:30px;font-weight:700;letter-spacing:-.035em;line-height:1.5}.notification-intro>p:not(.eyebrow){font-size:14px;line-height:1.9;color:#868e96;margin-top:18px;word-break:keep-all}.coupon-steps{margin-top:27px}.coupon-steps li{gap:12px;padding:15px 0}.coupon-steps li>span{border:0;border-radius:4px;background:#eef1fb;color:#425abd;min-width:28px;height:28px;font-size:11px;font-weight:600}.coupon-steps strong{font-size:14px;font-weight:600;color:#495057}.coupon-steps p{font-size:12px;color:#868e96;line-height:1.8;margin-top:5px}.upcoming-list>div{padding:16px 0;gap:12px;border-color:#e9ecef}.upcoming-list span{color:#adb5bd;font-size:11px}.upcoming-list strong{font-size:14px;font-weight:500;color:#495057}.upcoming-list b{color:#868e96;background:#f1f3f5;border-radius:3px;padding:3px 6px;font-size:10px}.notification-intro .notification-intro-note{color:#868e96;font-size:12px!important}.notification-card{padding:28px;border-color:#e9ecef;border-radius:6px;box-shadow:0 2px 8px #21252903}.notification-card h2,.notification-card #notification-receipt h2{font-size:21px;letter-spacing:-.035em;font-weight:700;line-height:1.5}.notification-preparing{margin:16px 0 25px;background:#f8f9fa;color:#868e96;padding:12px 14px;font-size:12px;line-height:1.8;border-radius:4px}#notification-form legend,.notification-label{font-size:13px;font-weight:600;color:#343a40;margin-bottom:10px}#notification-feedback,#notification-phone,#notification-cancel-link{background:#fff;border-color:#dee2e6;border-radius:4px;color:#343a40;font-size:14px;padding:11px 12px;line-height:1.7}#notification-feedback::placeholder,#notification-phone::placeholder{color:#adb5bd}.required-label{color:#425abd;font-size:11px}.feedback-help{color:#868e96;font-size:12px;line-height:1.8;margin:8px 0 25px}.notification-options label{background:#fff;border-color:#dee2e6;padding:11px 12px;border-radius:4px}.notification-options label:has(input:checked){border-color:#4962ce;background:#f5f7ff}.notification-card .notification-options label{font-size:13px}.notification-options input,.notification-consent input{accent-color:#4962ce;width:15px;height:15px;margin-right:5px}.notification-phone-note{font-size:12px;color:#868e96;margin-top:8px}.notification-consent{margin:23px 0}.notification-consent label{font-size:12px;color:#495057;line-height:1.85}.notification-consent p{color:#868e96;font-size:11px;line-height:1.85;margin-top:8px}.notification-consent input{margin-top:4px}#notification-message,#copy-message,#cancel-notification-message{color:#425abd;font-size:12px}.notification-check{width:38px;height:38px;background:#eef1fb;color:#425abd;font-size:22px;margin-bottom:16px}.issued-coupon{border:1px solid #c8d1ee;background:#f1f4fd;padding:21px;border-radius:5px;margin-top:22px}.issued-coupon-label{font-size:11px;color:#425abd;letter-spacing:0}.issued-coupon strong{font-size:20px;color:#425abd;font-weight:650;letter-spacing:-.035em}.issued-coupon .notification-label{color:#6b7278}.issued-coupon>p{font-size:12px;color:#868e96;line-height:1.8}#notification-coupon-code{color:#343a40;border-color:#c8d1ee}.coupon-actions button{border-color:#c8d1ee;color:#425abd}.coupon-actions button:hover{background:#eef1fb}#coupon-message{color:#425abd}#notification-receipt-text,#notification-cancel-panel>p,#notification-link-note{color:#868e96;font-size:12px;line-height:1.9}.notification-card #notification-cancel-link{font-size:11px}.notification-card .button.pale:not(:disabled){background:#f8f9fa;color:#495057;border-color:#dee2e6}
.purchase-heading .eyebrow{display:none}.purchase-heading h1{font-size:27px;font-weight:700;letter-spacing:-.035em}.purchase-layout{gap:28px;margin-top:24px;grid-template-columns:minmax(0,1.75fr) minmax(330px,1fr)}.course-detail,.order-card{border-color:#e9ecef;border-radius:6px}.course-detail-copy{padding:27px}.course-detail h2{font-size:23px;font-weight:700;letter-spacing:-.035em}.course-detail-copy>p{color:#868e96;font-size:14px;line-height:1.9}.hero-tags{gap:6px}.hero-tags span{background:#f1f3f5;border:0;border-radius:3px;color:#6b7278;padding:5px 8px;font-size:11px}.lesson-includes{padding:20px 0;margin:23px 0 4px;border-color:#e9ecef}.lesson-includes b,.lesson-includes time,.lesson-includes>p{color:#868e96}.lesson-includes>div{font-size:13px;color:#495057}.lesson-includes>p{font-size:12px}.order-card{padding:25px}.order-card h2{font-size:21px;font-weight:650;letter-spacing:-.035em}.order-card .eyebrow{color:#868e96;font-size:12px;margin-bottom:10px}.offer-callout{background:#eef1fb;border:0;padding:16px;border-radius:4px;margin:22px 0;color:#425abd}.offer-callout span{font-size:11px;color:#425abd}.offer-callout strong{font-size:17px;font-weight:650;letter-spacing:-.03em;color:#30479f}.offer-callout p{font-size:12px;color:#6a7da8;line-height:1.8}.price-breakdown{color:#495057}.price-breakdown dt{color:#868e96;font-size:13px}.price-breakdown .order-price{font-size:30px;letter-spacing:-.035em;color:#212529}.order-note,.no-charge{color:#868e96;font-size:12px;line-height:1.8}.no-charge{border-color:#e9ecef;font-size:11px}.notify-order-link{color:#425abd;font-size:12px}.course-detail-cover{aspect-ratio:16/9;background:#273653;color:#fff;display:flex;flex-direction:column;justify-content:center;padding:8%}.course-detail-cover>span{font-size:14px;color:#b9c6df;margin-bottom:12px}.course-detail-cover>strong{font-size:44px;color:#c4d0ff;line-height:1.3;font-weight:750;letter-spacing:-.045em}.course-detail-cover>p{font-size:15px;color:#b9c6df;margin-top:18px}
.analytics-heading h1{font-size:27px;letter-spacing:-.035em;font-weight:700}.analytics-heading h1+p{font-size:13px;margin-top:9px;color:#868e96}.analytics-heading h1+p span{color:#adb5bd}.analytics-controls select{border-color:#dee2e6;min-height:38px;padding:8px 11px}#analytics-status{color:#868e96}.analytics-metrics article,.analytics-chart-card,.analytics-exit-card,.admin-login{border-color:#e9ecef;border-radius:5px}.analytics-metrics p{color:#868e96}.analytics-metrics strong{color:#212529;font-weight:650;font-size:28px;letter-spacing:-.035em}.analytics-metrics small{color:#868e96}.analytics-card-heading h2{font-size:20px;letter-spacing:-.035em;font-weight:650}.analytics-card-heading .eyebrow,.analytics-reading .eyebrow{display:none}.analytics-card-heading h2+p{color:#868e96}.analytics-live{background:#eef1fb;border-color:#eef1fb;color:#425abd;font-size:11px;border-radius:4px}.analytics-empty{color:#868e96}.analytics-exits li{border-color:#e9ecef}.analytics-exits .exit-rank,.analytics-exits li>span:last-child{color:#868e96}.analytics-reading{background:#f8f9fa;border-color:#e9ecef;border-radius:5px}.analytics-reading h2{font-size:20px;font-weight:650;letter-spacing:-.035em}.analytics-reading>p:not(.eyebrow){color:#868e96;line-height:1.9}.analytics-table-details summary{color:#495057}.analytics-table-wrap th,.analytics-table-wrap td{border-color:#e9ecef}.analytics-table-wrap th{color:#495057;background:#f8f9fa}.analytics-table-wrap td{color:#868e96}.admin-login input{border-color:#dee2e6}
@media(max-width:1280px){.course{margin-left:32px;margin-right:32px}}
@media(max-width:1100px){.lesson-layout{grid-template-columns:minmax(0,1fr) 300px;gap:18px}.transcript-body{height:365px}.notification-layout{gap:40px}.notification-intro h1{font-size:27px}}
@media(max-width:760px){.nav-links>a:first-child{display:none}}
@media(max-width:900px){.lesson-layout{display:block}.transcript-panel{margin-top:3px}.transcript-body{height:335px}.course .analytics-privacy{margin-top:16px}.notification-layout{gap:28px}}
@media(max-width:760px){.course{margin:0 20px 35px}.course>.back-link{margin:21px 0}.course-heading{margin-bottom:18px;padding:0}.course-heading h1{font-size:22px;line-height:1.5}.course-heading p{font-size:12px}.status{margin-top:12px;font-size:11px;padding:5px 8px}.player-bar{padding:14px 0;gap:15px;align-items:center}.player-bar p{font-size:12px}#play-button{font-size:12px;min-width:88px;min-height:38px;padding:9px 12px}.transcript-panel>summary{font-size:13px;padding:14px 15px}.transcript-body{height:310px}.transcript-header{padding:0 14px}.transcript-help{margin-left:14px;margin-right:14px}.cue{font-size:14px;line-height:1.85;padding:11px 9px;grid-template-columns:33px minmax(0,1fr)}.price-row{margin:0;padding-top:20px;display:block}.price-main{font-size:13px;gap:10px}.price-main strong{font-size:22px}.price-notes{font-size:12px;margin-top:12px;text-align:left}.course .analytics-privacy{font-size:10px;margin-bottom:20px}.notification-layout{display:block;margin:6px 0 40px}.notification-intro{padding:0}.notification-intro h1{font-size:26px;line-height:1.5}.notification-intro h1 br{display:none}.notification-intro>p:not(.eyebrow){font-size:13px;line-height:1.9;margin-top:13px}.notification-intro .notification-intro-note{font-size:11px!important}.notification-card{padding:23px 19px;margin-top:24px;box-shadow:none}.notification-card h2,.notification-card #notification-receipt h2{font-size:20px}.notification-preparing{font-size:12px;padding:12px}.notification-consent p{font-size:11px;line-height:1.9}.notification-consent label{font-size:12px}.notification-options label{padding:11px 8px}.notification-card .notification-options label{font-size:13px}#notification-feedback,#notification-phone{font-size:14px}.notification-card .button{font-size:13px}.issued-coupon{padding:19px 14px}.issued-coupon strong{font-size:18px}#notification-coupon-code{font-size:12px}.purchase-heading h1{font-size:24px}.purchase-layout{display:flex;gap:23px;margin-top:22px}.course-detail-copy{padding:21px}.course-detail h2{font-size:21px}.course-detail-copy>p{font-size:13px}.course-detail-cover>strong{font-size:36px}.course-detail-cover>span{font-size:12px}.course-detail-cover>p{font-size:12px}.order-card{padding:22px}.order-card h2{font-size:20px}.analytics-heading h1{font-size:24px}.analytics-controls{margin-top:20px}.analytics-metrics strong{font-size:24px}.analytics-card-heading h2,.analytics-reading h2{font-size:19px}.analytics-live{font-size:10px;padding:6px 8px}}

/* Brand accents: ink navy with a muted blue action color. */
.nav-shell .wordmark,.catalog-page .wordmark{color:#273653}.nav-shell .brand-icon{color:#4962ce}.lecture-card h3 a:hover{color:#425abd}
.footer .footer-contact{white-space:nowrap}.footer .footer-contact:hover{color:#425abd}@media(max-width:900px){.footer{flex-wrap:wrap}.footer>a.footer-contact{flex-basis:100%;margin-top:3px;text-align:right}}@media(max-width:760px){.footer>a.footer-contact{text-align:left;margin-top:1px}}

/* Give the lesson the available screen width while keeping the transcript optional. */
.watch-page .nav,.watch-page .footer,.watch-page .course{width:calc(100% - 64px);max-width:1760px;margin-left:auto;margin-right:auto}
.watch-page .course>.back-link{margin:20px 0 14px}
.watch-page .course-heading{margin-bottom:18px}
.watch-page .lesson-layout{container-type:inline-size;grid-template-columns:minmax(0,1fr) 320px;gap:24px}
.watch-page .transcript-panel>summary{font-size:13px}
.watch-page .lesson-layout:has(.transcript-panel:not([open])){grid-template-columns:minmax(0,1fr);gap:0}
.watch-page .transcript-panel:not([open]){justify-self:end;width:max-content;max-width:100%;margin:0 0 16px auto}
@media(min-width:1101px){
  .watch-page .transcript-panel[open]{align-self:start;margin:0}
  .watch-page .transcript-body{height:calc(56.25cqw - 247px);min-height:260px}
}
@media(max-width:1100px){
  .watch-page .lesson-layout{display:block}
  .watch-page .transcript-panel[open]{margin:0 0 20px}
  .watch-page .transcript-body{height:340px}
}
@media(max-width:760px){
  .watch-page .nav,.watch-page .footer,.watch-page .course{width:calc(100% - 32px)}
  .watch-page .course>.back-link{margin:18px 0 12px}
  .watch-page .transcript-body{height:310px}
}
