@font-face{font-family:Paperlogy;src:url('/learn-fonts/Paperlogy-Regular.woff') format('woff');font-style:normal;font-weight:400;font-display:swap}
@font-face{font-family:Paperlogy;src:url('/learn-fonts/Paperlogy-SemiBold.woff') format('woff');font-style:normal;font-weight:600;font-display:swap}
:root{font-family:Paperlogy,'Apple SD Gothic Neo','Malgun Gothic',sans-serif;font-size:17px;line-height:1.6;font-synthesis:none;color:var(--ink);background:var(--canvas);--blue:#005EFE;--brand-hover:#004ED8;--brand-active:#0044BF;--brand-soft:#EAF2FF;--brand-border:#B8D2FF;--focus:rgba(0,94,254,.24);--canvas:#FFF;--surface:#F7F7F8;--surface-strong:#EFEFF1;--ink:#171719;--secondary:#5F6168;--muted:#85878D;--line:#E2E3E6;--line-strong:#C9CBD0;--success:#16803C;--warning:#B86100;--danger:#C93532;--scrim:rgba(23,23,25,.7);--player:#101114}
*{box-sizing:border-box}body{margin:0}a,button,input,select{touch-action:manipulation}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-width:44px;min-height:44px;padding:12px 16px;border:1px solid var(--line-strong);border-radius:12px;background:var(--canvas);color:var(--ink);font-size:16px;line-height:20px;font-weight:600;cursor:pointer}button:hover:not(:disabled){background:var(--surface);border-color:var(--blue)}button:active:not(:disabled){background:var(--surface-strong)}button:disabled{opacity:.45;cursor:default}.primary,button.primary{background:var(--blue);border-color:var(--blue);color:var(--canvas)}button.primary:hover:not(:disabled){background:var(--brand-hover)}button.primary:active:not(:disabled){background:var(--brand-active)}:is(button,a,input,select):focus-visible{outline:3px solid var(--blue);outline-offset:3px;box-shadow:0 0 0 6px var(--focus)}[hidden]{display:none!important}strong,b,h1,h2,h3{font-weight:600}small{font-size:14px}img{max-width:100%}
.material-symbols-rounded{font-family:'Material Symbols Rounded';font-weight:400;font-style:normal;font-size:24px;line-height:1;letter-spacing:normal;text-transform:none;display:inline-block;white-space:nowrap;word-wrap:normal;direction:ltr;font-feature-settings:'liga';-webkit-font-smoothing:antialiased;font-variation-settings:'FILL' 0,'wght' 400,'GRAD' 0,'opsz' 24}.icon{flex-shrink:0;width:24px;height:24px}.icon-small{font-size:20px;width:20px;height:20px;font-variation-settings:'FILL' 0,'wght' 400,'GRAD' 0,'opsz' 20}
.page-shell,#main,footer{width:min(100%,1200px);margin-inline:auto;padding-inline:24px}.header{border-bottom:1px solid var(--line);background:var(--canvas)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:24px}.brand{display:flex;align-items:center;gap:12px;font-size:24px;line-height:1.3;font-weight:600;white-space:nowrap}.brand small{display:block;font-size:14px;letter-spacing:1px;color:var(--secondary);margin-top:4px;font-weight:400}.logo{display:grid;place-items:center;background:var(--blue);width:48px;height:48px;border-radius:12px;color:var(--canvas);font-size:36px}.header nav{display:flex;align-items:center;gap:24px;font-size:16px;font-weight:600;min-width:0}.header nav>a{display:flex;align-items:center;min-height:44px;color:var(--secondary);white-space:nowrap}.header nav>a.active{color:var(--blue)}#account{min-width:0}.account-button{font-size:14px;overflow-wrap:anywhere}.skip{position:absolute;left:-10000px}.skip:focus{left:16px;top:16px;z-index:100;background:var(--canvas);padding:12px}#main{padding-block:32px 64px;min-height:75vh}
h1,h2,h3,p{margin-top:0;overflow-wrap:anywhere}h1{font-size:clamp(32px,3.5vw,40px);line-height:1.2;letter-spacing:-.8px;margin-bottom:16px}h2{font-size:clamp(24px,2.5vw,30px);line-height:1.3;letter-spacing:-.4px;margin-bottom:16px}h3{font-size:20px;line-height:1.5;margin-bottom:12px}p{line-height:1.6}.muted,.sub{color:var(--secondary)}.sub{font-size:14px;line-height:1.5}.eyebrow{font-size:14px;font-weight:600;letter-spacing:1px;color:var(--blue);margin-bottom:12px}.home-intro{margin:32px 0 24px}.profile-panel{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px;border:1px solid var(--brand-border);border-radius:24px;background:var(--brand-soft);margin-bottom:32px}.profile-copy{min-width:0}.profile-copy strong{display:block;font-size:20px;line-height:1.5;margin-bottom:4px;overflow-wrap:anywhere}.profile-copy p{font-size:14px;color:var(--secondary);margin:0}.profile-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.profile-chip{display:flex;align-items:center;gap:8px;font-size:14px}.profile-chip.active{color:var(--blue);border-color:var(--blue);background:var(--canvas)}.avatar{font-size:24px;line-height:1;flex-shrink:0}.category-tabs{display:flex;gap:8px;overflow-x:auto;padding:4px 4px 12px;scrollbar-width:thin}.category-tabs button{white-space:nowrap;flex-shrink:0;border-radius:9999px;padding-inline:20px;background:var(--surface);border-color:var(--line);font-size:14px}.category-tabs button[aria-pressed=true]{background:var(--blue);color:var(--canvas);border-color:var(--blue)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:32px 0 16px;flex-wrap:wrap}.section-head h1,.section-head h2{margin:0}
.programs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.card{display:flex;flex-direction:column;padding:20px;border:1px solid var(--line);background:var(--canvas);border-radius:20px;min-width:0;transition:border-color .15s}.card:hover{border-color:var(--blue)}.cover{aspect-ratio:16/10;position:relative;background:var(--surface-strong);overflow:hidden;border-radius:12px}.cover img{display:block;width:100%;height:100%;object-fit:cover}.badge{display:inline-flex;align-items:center;padding:4px 8px;border-radius:8px;background:var(--brand-soft);color:var(--brand-active);font-size:14px;font-weight:600;line-height:20px}.cover .badge{position:absolute;left:8px;top:8px;z-index:1;background:var(--canvas);color:var(--blue)}.card-copy{display:flex;flex-direction:column;flex:1;margin-top:16px}.english{font-size:14px;line-height:20px;color:var(--secondary);margin-bottom:8px;overflow-wrap:anywhere}.card-copy h3{margin-bottom:16px}.card-foot{display:flex;flex-direction:column;gap:4px;font-size:14px;line-height:20px;color:var(--secondary);margin-top:auto}.card-foot span:last-child{color:var(--blue)}.shelf{margin-top:40px}.shelf-note{font-size:14px;color:var(--secondary);margin:8px 0 0;line-height:20px}.video-rail{display:grid;grid-auto-flow:column;grid-auto-columns:calc((100% - 48px)/4);gap:16px;overflow-x:auto;scroll-snap-type:x proximity;padding:4px 4px 16px;scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent}.video-tile{display:flex;flex-direction:column;justify-content:flex-start;align-items:stretch;gap:0;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--canvas);text-align:left;font-weight:400;min-width:0;scroll-snap-align:start;transition:border-color .15s}.video-tile.selected{border-color:var(--blue);background:var(--brand-soft)}.tile-image{display:grid;place-items:center;position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:12px;background:var(--surface-strong)}.tile-image img{display:block;width:100%;height:100%;object-fit:cover;grid-area:1/1}.tile-play{grid-area:1/1;z-index:2;width:44px;height:44px;display:grid;place-items:center;border-radius:9999px;color:var(--canvas);background:var(--scrim);opacity:0;transition:opacity .15s}.video-tile:hover .tile-play,.video-tile:focus-visible .tile-play{opacity:1}.tile-time{position:absolute;bottom:8px;right:8px;padding:4px;background:var(--scrim);color:var(--canvas);font-size:14px;line-height:18px;border-radius:4px;z-index:2}.watch-label{position:absolute;top:8px;left:8px;z-index:2;display:flex;align-items:center;gap:4px;padding:4px 8px;background:var(--brand-active);color:var(--canvas);font-size:14px;line-height:20px;font-weight:600;border-radius:8px}.watch-label.complete{background:var(--success)}.watch-bar{position:absolute;bottom:0;left:0;right:0;height:4px;background:var(--line-strong);z-index:3;overflow:hidden}.watch-bar i{height:100%;display:block;background:var(--blue)}.watch-bar.complete i{background:var(--success)}.tile-info{margin-top:12px;display:block;min-width:0}.tile-info strong{font-size:16px;line-height:25px;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;overflow-wrap:anywhere;font-weight:600}.tile-info em{font-style:normal;color:var(--secondary);font-weight:400}.tile-info small{display:block;font-size:14px;color:var(--secondary);line-height:20px;margin-top:8px;overflow-wrap:anywhere}
.breadcrumbs{display:flex;gap:12px;font-size:14px;align-items:center;flex-wrap:wrap;margin-bottom:24px;color:var(--secondary)}.breadcrumbs a{color:var(--blue);font-weight:600;display:inline-flex;align-items:center;min-height:44px}.course-control{padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:20px;margin:24px 0}.course-control label{display:block;font-size:16px;font-weight:600;margin-bottom:12px}select{max-width:100%;min-height:44px;padding:12px;border-radius:12px;border:1px solid var(--line-strong);background:var(--canvas);color:var(--ink);font-size:16px}.course-control select{width:100%}.level-tabs{display:flex;gap:8px;margin-bottom:20px;overflow-x:auto;padding:4px}.level-tab{flex:1 0 96px;display:flex;flex-direction:column;gap:8px;justify-content:center;padding:12px;background:var(--canvas)}.level-tab strong{display:grid;place-items:center;font-size:24px;line-height:1;width:44px;height:44px;background:var(--brand-soft);color:var(--blue);border-radius:12px}.level-tab[aria-current=true]{border-color:var(--blue);background:var(--brand-soft);color:var(--brand-active)}.level-tab[aria-current=true] strong{background:var(--blue);color:var(--canvas)}.level-tab span{font-size:14px;white-space:nowrap}.viewer-layout{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:24px;align-items:start}.player-column{min-width:0}.language{display:flex;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:4px;margin-bottom:16px;gap:4px}.language button{flex:1;background:transparent;border:0}.language button[aria-pressed=true]{background:var(--blue);color:var(--canvas)}.player-box{aspect-ratio:16/9;background:var(--player);color:var(--canvas);border:1px solid var(--line);border-radius:20px;overflow:hidden;position:relative;display:grid;place-items:center;min-width:0;min-height:200px}.player-box iframe{width:100%;height:100%;position:absolute;inset:0;border:0}.player-empty{text-align:center;padding:24px;max-width:500px}.player-empty strong{display:block;font-size:22px;line-height:28px;margin-bottom:12px}.player-empty p{font-size:14px;line-height:20px;color:var(--line)}.play-start{min-width:144px}.play-status{font-size:14px;color:var(--secondary);padding-block:12px;line-height:20px;min-height:44px}.play-status.error{color:var(--danger)}.title-row{display:flex;gap:16px;align-items:start;justify-content:space-between;margin:16px 0;flex-wrap:wrap}.title-row>div{min-width:0;flex:1 1 180px}.title-row h2{margin:0 0 8px}.navigation{display:flex;align-items:center;justify-content:space-between;gap:8px;padding-block:20px;border-top:1px solid var(--line);margin-top:24px}.navigation span{font-size:14px;color:var(--secondary);text-align:center}.navigation button{flex-shrink:0}.auto-next,.filter-choice{display:flex;align-items:center;gap:12px;font-size:14px;color:var(--secondary);line-height:20px;min-height:44px}.auto-next input,.filter-choice input{width:24px;height:24px;accent-color:var(--blue);flex-shrink:0;margin:0}.auto-next{margin-top:8px}.queue{background:var(--surface);border:1px solid var(--line);border-radius:20px;overflow:hidden;min-width:0}.queue-head{padding:20px;border-bottom:1px solid var(--line)}.queue-head h3{margin:0 0 12px}.queue-head p{font-size:14px;line-height:20px;color:var(--secondary)}.search{width:100%;min-width:0;min-height:44px;padding:12px;background:var(--canvas);color:inherit;border:1px solid var(--line-strong);border-radius:12px;font-size:16px}.queue-list{display:grid;grid-template-columns:minmax(0,1fr);gap:16px;padding:20px;max-height:840px;overflow:auto;overscroll-behavior:contain}.queue-list .empty{grid-column:1/-1}.more{display:flex;width:calc(100% - 40px);margin:20px;font-size:16px}.record-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.record-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:24px 0}.stats{display:flex;gap:8px;flex-wrap:wrap}.stats span{font-size:14px;background:var(--surface);padding:12px;border:1px solid var(--line);border-radius:12px}.stats strong{color:var(--blue);margin-left:8px}.record{display:flex;align-items:center;gap:16px;background:var(--brand-soft);border:1px solid var(--brand-border);padding:20px;border-radius:20px}.record>span:last-child{min-width:0;overflow-wrap:anywhere}.record strong{display:block;font-size:18px;line-height:29px}.record small{display:block;font-size:14px;line-height:20px;margin-top:8px;color:var(--secondary)}.stamp{width:80px;height:80px;border:2px dashed var(--blue);color:var(--brand-active);border-radius:9999px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:4px;font-size:14px;line-height:20px;font-weight:600;flex-shrink:0;background:var(--canvas)}.stamp b{display:flex;align-items:center;justify-content:center}.stamp.done{color:var(--success);border-color:var(--success)}
.text-button{background:transparent;border:0;color:var(--blue);font-size:14px;padding:12px;min-height:44px}.empty{padding:24px;border:1px dashed var(--line-strong);border-radius:20px;line-height:1.6;color:var(--secondary);text-align:center;grid-column:1/-1;overflow-wrap:anywhere}.loading{padding:48px 16px;text-align:center;color:var(--secondary)}.catalog-meta,.lang-note{font-size:14px;color:var(--secondary);line-height:20px;margin-top:24px}.note{background:var(--surface);border:1px solid var(--line-strong);color:var(--warning);padding:16px;border-radius:16px;font-size:14px;line-height:20px}.field-help{font-size:14px;color:var(--secondary);line-height:20px;margin:12px 0}.filter-choice{margin-top:16px}.form-columns{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}.form-columns select{width:100%;margin-top:12px}#notice:not(:empty){position:sticky;top:0;z-index:20;background:var(--brand-soft);color:var(--brand-active);padding:16px;font-size:14px;line-height:20px;text-align:center;border-bottom:1px solid var(--brand-border);overflow-wrap:anywhere}footer{padding-block:24px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-top:1px solid var(--line);font-size:14px;line-height:20px;color:var(--secondary)}footer>a{display:flex;align-items:center;min-height:44px;font-weight:600;white-space:nowrap}footer .text-button{flex-shrink:0}
dialog{border:1px solid var(--line);border-radius:24px;background:var(--canvas);color:var(--ink);padding:24px;width:min(560px,calc(100% - 32px));max-height:calc(100vh - 32px);max-height:calc(100dvh - 32px);overflow-y:auto;overscroll-behavior:contain;box-shadow:0 24px 80px rgba(23,23,25,.24)}dialog::backdrop{background:var(--scrim)}dialog h2{font-size:24px;line-height:1.3;margin-bottom:16px;padding-right:48px}dialog p{font-size:16px;color:var(--secondary)}#dialog-content{position:relative;min-width:0}.dialog-close{position:absolute;right:0;top:0;display:grid;place-items:center;width:44px;height:44px;padding:8px;background:var(--surface);border:0}.dialog-actions{display:flex;gap:12px;justify-content:flex-end;flex-wrap:wrap;margin-top:24px}.dialog-actions button{flex:1;min-width:100px}.form-label{display:block;font-size:16px;font-weight:600;margin:20px 0 8px}.form-input{display:block;width:100%;min-width:0;min-height:48px;padding:12px;border:1px solid var(--line-strong);border-radius:12px;background:var(--canvas);color:var(--ink);font-size:16px;line-height:24px}.form-input::placeholder{color:var(--secondary);font-size:14px}.avatars{display:flex;gap:8px;flex-wrap:wrap}.avatars button{padding:8px;font-size:24px;width:48px;height:48px}.avatars button[aria-pressed=true]{border-color:var(--blue);background:var(--brand-soft)}.form-error{color:var(--danger);font-size:14px;line-height:20px;margin-top:16px;overflow-wrap:anywhere}.profile-row{display:flex;gap:12px;align-items:center;margin-top:12px}.profile-row>button:first-child{flex:1;display:flex;align-items:center;justify-content:flex-start;gap:12px;text-align:left}.profile-row>button{min-width:0;overflow-wrap:anywhere}.profile-row-actions{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end;flex-shrink:0}.profile-program-link{margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}.auth-links{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:16px;flex-wrap:wrap}.legacy-login{border-top:1px solid var(--line);margin-top:16px;text-align:center;padding-top:20px;color:var(--secondary);font-size:14px}.account-details{display:grid;grid-template-columns:100px minmax(0,1fr);gap:16px;font-size:14px;line-height:20px;padding:20px;background:var(--surface);border-radius:20px}.account-details dt{color:var(--secondary)}.account-details dd{margin:0;overflow-wrap:anywhere}.recovery-output{font-family:monospace;font-size:16px;letter-spacing:0}.password-field{display:grid;grid-template-columns:minmax(0,1fr) 48px;align-items:center}.password-field>.form-input{grid-area:1/1/2/3;padding-right:52px}.password-toggle{grid-area:1/2;justify-self:center;z-index:1;display:grid;place-items:center;width:44px;height:44px;padding:8px;border:0;background:transparent}.password-toggle[aria-pressed=true] .icon{font-variation-settings:'FILL' 1,'wght' 400,'GRAD' 0,'opsz' 24;color:var(--blue)}
.program-settings-tools{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.program-settings-tools button{font-size:14px}.program-settings-list{display:grid;gap:12px}.program-setting-row{display:grid;grid-template-columns:24px minmax(0,1fr) auto;align-items:center;gap:12px;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.program-order-number{font-size:16px;font-weight:600;color:var(--secondary);text-align:center}.program-setting-choice{display:flex;align-items:center;gap:12px;min-width:0;min-height:44px;cursor:pointer}.program-setting-choice img{width:56px;aspect-ratio:16/9;object-fit:cover;border-radius:8px}.program-setting-choice>span{flex:1;min-width:0;overflow-wrap:anywhere}.program-setting-choice strong{display:block;font-size:16px;line-height:25px}.program-setting-choice small{display:block;color:var(--secondary);font-size:14px;line-height:20px}.program-setting-choice input{width:24px;height:24px;flex-shrink:0;accent-color:var(--blue);margin:0}.program-order-buttons{display:flex;flex-direction:column;gap:4px}.program-order-buttons button{font-size:14px;padding:12px;min-height:44px}#program-settings-error .text-button{display:flex;margin-top:8px}
@media(max-width:1023px){.programs{grid-template-columns:repeat(3,minmax(0,1fr))}.video-rail{grid-auto-columns:calc((100% - 32px)/3)}.record-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.viewer-layout{grid-template-columns:minmax(0,1fr)}.queue-list{grid-template-columns:repeat(3,minmax(0,1fr));max-height:720px}.profile-panel{align-items:flex-start;flex-direction:column}.header-inner{gap:16px}.header nav{gap:16px}}
@media(max-width:767px){:root{font-size:16px}.page-shell,#main,footer{padding-inline:16px}.header-inner{flex-direction:column;align-items:flex-start;padding-block:16px;gap:16px}.header nav{width:100%;gap:16px;flex-wrap:wrap}.header nav>a{font-size:14px}#account{margin-left:auto}.account-button{max-width:180px}.brand{font-size:24px}#main{padding-block:24px 48px}.profile-panel{padding:16px}.programs{grid-template-columns:repeat(2,minmax(0,1fr))}.card{padding:16px}.video-rail{grid-auto-columns:calc((100% - 16px)/2)}.record-grid,.queue-list{grid-template-columns:repeat(2,minmax(0,1fr))}.queue-head,.queue-list{padding:16px}.course-control{padding:16px}.more{width:calc(100% - 32px);margin:16px}.section-head{align-items:flex-start;margin-top:24px}.shelf{margin-top:32px}.video-tile{padding:16px}.record{padding:16px}footer{flex-wrap:wrap;gap:16px}footer span{order:3;flex-basis:100%}footer .text-button{margin-left:auto}dialog{padding:16px}.program-setting-choice img{display:none}.profile-row{align-items:stretch;flex-direction:column}.profile-row-actions{justify-content:flex-end}.profile-row-actions button{flex:1}.program-setting-row{grid-template-columns:24px minmax(0,1fr)}.program-order-buttons{grid-column:2;flex-direction:row;gap:8px}.program-order-buttons button{flex:1}.program-settings-tools button{flex:1}.player-empty{padding:16px}.player-empty strong{font-size:20px;line-height:30px}}
@media(max-width:550px){.programs{display:grid;grid-auto-flow:column;grid-template-columns:none;grid-auto-columns:80%;overflow-x:auto;scroll-snap-type:x proximity;padding:4px 4px 16px;scrollbar-width:thin}.card{scroll-snap-align:start}.video-rail{grid-auto-columns:84%}.profile-actions{width:100%}.profile-chip{flex:1;min-width:112px}.title-row h2{font-size:24px}.navigation button{padding-inline:12px}.queue-list .tile-info strong,.record-grid .tile-info strong{font-size:14px;line-height:20px}.queue-list,.record-grid{gap:12px}.queue-list .video-tile,.record-grid .video-tile{padding:16px}.queue-list .watch-label,.record-grid .watch-label{left:4px;top:4px;padding:4px}.watch-label .icon-small{display:none}.tile-time{right:4px;bottom:8px}.player-box:has(.player-empty){aspect-ratio:auto;min-height:220px}.form-columns{gap:12px}.account-details{grid-template-columns:minmax(0,1fr);gap:8px;padding:16px}.account-details dd{margin-bottom:8px}.program-settings-tools button{flex:1 1 100px}}
@media(max-width:380px){.header nav{gap:8px}.account-button{max-width:116px;padding-inline:8px}.record-grid,.queue-list{grid-template-columns:minmax(0,1fr)}.programs{grid-auto-columns:88%}.form-columns{grid-template-columns:minmax(0,1fr)}.program-setting-row{padding:16px;gap:8px}.program-order-buttons{grid-column:1/-1}.navigation{flex-wrap:wrap}.navigation span{order:3;width:100%}.navigation button{flex:1}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}