.learning-task-page{--task-sidebar-width: 264px;--workbook-section-space: clamp(var(--s-7), 8vw, var(--s-8));max-width:calc(var(--page-max) + var(--task-sidebar-width) + var(--s-2));padding-top:0;padding-bottom:var(--s-8);background:var(--c-bg-2);word-break:keep-all}.learning-task-page [hidden]{display:none!important}.learning-task-mobile-picker{display:none}.learning-task-shell{display:grid;grid-template-columns:var(--task-sidebar-width) var(--s-2) minmax(0,1fr);min-height:min(840px,82vh);overflow:hidden;border-bottom:var(--border-strong);background:var(--c-bg)}.learning-task-sidebar{min-width:0;max-height:min(840px,82vh);overflow-y:auto;border-right:var(--border-strong);background:var(--c-bg-2);scrollbar-gutter:stable}.learning-task-sidebar-head{position:sticky;z-index:var(--z-raised);top:0;display:grid;gap:var(--s-2);padding:var(--s-6) var(--s-5) var(--s-5);border-bottom:var(--border-strong);background:var(--c-bg-2)}.learning-task-sidebar-head label,.learning-task-mobile-picker label{color:var(--c-ink);font-size:var(--fs-xs);font-weight:var(--w-semibold)}.learning-task-sidebar-head input,.learning-task-mobile-picker select{width:100%;min-height:44px;padding:var(--s-2) var(--s-3);border:var(--border-strong);border-radius:0;background:var(--c-bg);color:var(--c-ink);font:inherit}.learning-task-sidebar-head p{color:var(--c-ink-3);font-size:var(--fs-2xs);font-variant-numeric:lining-nums}.learning-task-group{padding:var(--s-5)}.learning-task-group+.learning-task-group{border-top:var(--border)}.learning-task-group h2{display:grid;grid-template-columns:18px minmax(0,1fr);gap:var(--s-2);align-items:center;margin-bottom:var(--s-3);font-family:var(--f-body);font-size:var(--fs-sm);font-weight:var(--w-semibold);letter-spacing:var(--ls-ko)}.learning-task-group h2:before{width:18px;height:2px;background:var(--c-accent);content:""}.learning-task-group h2>span{grid-column:2}.learning-task-group h2 small{grid-column:2;color:var(--c-ink-3);font-size:var(--fs-2xs);font-weight:var(--w-regular)}.learning-task-group ol{border-top:var(--border-strong);list-style:none}.learning-task-group li{border-bottom:var(--border)}.learning-task-group a{display:grid;grid-template-columns:30px minmax(0,1fr);gap:var(--s-2);padding:var(--s-3) 0;color:var(--c-ink-2);transition:color var(--t) var(--ease),padding var(--t) var(--ease)}.learning-task-group a:hover,.learning-task-group a.is-selected{padding-left:var(--s-2);color:var(--c-ink);opacity:1}.learning-task-group a.is-selected{box-shadow:inset 2px 0 0 var(--c-accent)}.learning-task-group a.is-selected .learning-task-number{color:var(--c-accent-text);font-weight:var(--w-semibold)}.learning-task-number{padding-top:2px;color:var(--c-ink-3);font-family:var(--f-body);font-size:var(--fs-2xs);letter-spacing:var(--ls-ko);font-variant-numeric:tabular-nums}.learning-task-link-copy{display:grid;gap:var(--s-1)}.learning-task-link-copy strong{font-size:var(--fs-sm);font-weight:var(--w-medium);line-height:var(--lh-tight)}.learning-task-link-copy>span{color:var(--c-ink-3);font-size:var(--fs-2xs)}.learning-task-resize{position:relative;width:var(--s-2);cursor:col-resize;touch-action:none}.learning-task-resize:after{position:absolute;top:0;bottom:0;left:calc(50% - 1px);width:1px;background:transparent;content:""}.learning-task-resize:hover:after,.learning-task-resize:focus-visible:after{background:var(--c-accent)}.learning-task-reader{min-width:0;max-height:min(840px,82vh);overflow-y:auto;padding:clamp(var(--s-7),7vw,var(--s-8)) clamp(var(--s-5),6vw,var(--s-8)) var(--s-8);background:var(--c-bg);scroll-behavior:smooth}.learning-task-reader-head{max-width:var(--read-editorial);margin-bottom:var(--workbook-section-space);padding-bottom:var(--s-6);border-bottom:var(--border-strong)}.learning-task-reader-meta{display:flex;align-items:center;gap:var(--s-2);margin-bottom:var(--s-5);color:var(--c-ink-3);font-size:var(--fs-xs);letter-spacing:var(--ls-ko)}.learning-task-reader-meta:before{width:18px;height:2px;background:var(--c-accent);content:""}.learning-task-reader-head h2{max-width:820px;margin-bottom:var(--s-4);font-family:var(--f-body);font-size:clamp(var(--fs-3xl),4vw,52px);font-weight:var(--w-semibold);line-height:1.08;letter-spacing:-.045em;text-wrap:balance}.learning-task-reader-head>p:not(.learning-task-reader-meta){max-width:760px;margin-bottom:var(--s-4);color:var(--c-ink-2);font-size:var(--fs-md);line-height:var(--lh-relaxed)}.learning-task-reader-head a{color:var(--c-accent-text);font-size:var(--fs-xs);text-decoration:underline;text-underline-offset:var(--s-1)}.learning-task-body{max-width:var(--read-editorial)}.learning-task-chapter+.learning-task-chapter{margin-top:var(--workbook-section-space);padding-top:var(--workbook-section-space);border-top:var(--border)}.learning-task-chapter>h3{display:flex;align-items:center;gap:var(--s-2);margin-bottom:var(--s-6);color:var(--c-ink-3);font-family:var(--f-body);font-size:var(--fs-xs);font-weight:var(--w-medium);letter-spacing:var(--ls-ko)}.learning-task-chapter>h3:before{width:18px;height:2px;background:var(--c-accent);content:""}.learning-task-body .lesson-figure,.learning-task-body .lesson-callout,.learning-task-body .try-item,.learning-task-body .atom-detail-glossary{border-radius:0;box-shadow:none}.learning-task-body .lesson-callout{border-left:0;background:var(--c-bg-2)}.learning-task-body .try-item{border-color:var(--c-line);background:var(--c-bg-2)}.learning-task-body .try-copy{border-radius:0;background:var(--c-ink);color:var(--c-bg)}.learning-task-loading,.learning-task-error,.learning-task-empty,.learning-task-noscript{padding:var(--s-5);color:var(--c-ink-2);font-size:var(--fs-sm)}@media(max-width:760px){.learning-task-page{padding-inline:var(--gut)}.learning-task-mobile-picker{position:sticky;z-index:var(--z-sticky);top:0;display:grid;gap:var(--s-1);margin-bottom:0;padding:var(--s-4);border-bottom:var(--border-strong);background:var(--c-bg-2)}.learning-task-shell{display:flex;min-height:0;overflow:visible;border-bottom:0;background:transparent;flex-direction:column}.learning-task-reader{order:1;max-height:none;padding:var(--s-7) var(--s-4) var(--s-8);overflow:visible;border-bottom:var(--border-strong)}.learning-task-reader-head{margin-bottom:var(--s-7)}.learning-task-reader-head h2{font-size:var(--fs-3xl)}.learning-task-sidebar{order:2;max-height:none;overflow:visible;border-right:0;border-bottom:var(--border-strong)}.learning-task-sidebar-head{position:static;padding:var(--s-6) var(--s-4) var(--s-5)}.learning-task-group{padding:var(--s-5) var(--s-4)}.learning-task-resize{display:none}}.learn-landing{--landing-section-space: clamp(var(--s-7), 8vw, var(--s-8));word-break:keep-all}.learn-landing .learn-landing-label{color:var(--c-ink-3);font-family:var(--f-mono);font-size:var(--fs-2xs);letter-spacing:.12em;text-transform:uppercase}.learn-landing .learn-landing-label i{color:var(--c-accent-text);font-family:var(--f-display-serif);font-size:var(--fs-sm);letter-spacing:0;text-transform:none}.learn-landing-button{display:inline-flex;align-items:center;min-height:44px;padding:0 var(--s-3);border:1px solid var(--c-accent);border-radius:var(--r-btn);color:var(--c-accent-text);font-size:var(--fs-xs);font-weight:var(--w-medium);letter-spacing:var(--ls-ko);text-decoration:none;transition:background-color var(--t) var(--ease),color var(--t) var(--ease)}.learn-landing-button:focus-visible,.learn-landing-course:focus-visible,.learn-landing-task:focus-visible{outline:2px solid var(--c-accent);outline-offset:3px}@media(hover:hover)and (pointer:fine){.learn-landing-button:hover{background:var(--c-accent);color:var(--c-bg);opacity:1}}.learn-landing-hero{padding-block:var(--s-8) var(--s-7)}.learn-landing-hero .learn-landing-title{display:grid;gap:var(--s-3);margin:0 0 var(--s-5)}.learn-landing-hero .learn-landing-display{color:var(--c-accent-text);font-family:var(--f-display-serif);font-size:var(--fs-display-en);font-style:italic;font-weight:var(--w-regular);letter-spacing:-.015em;line-height:1}.learn-landing-hero .learn-landing-title-ko{color:var(--c-ink);font-family:var(--f-body);font-size:var(--fs-lg);font-weight:var(--w-semibold);letter-spacing:var(--ls-ko);line-height:1.4}.learn-landing-hero p:last-child{max-width:var(--read-ko);margin:0;color:var(--c-ink-2);font-size:var(--fs-base);line-height:var(--lh-normal)}.learn-landing-head{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--s-3);margin-bottom:var(--s-5);padding-bottom:var(--s-3);border-bottom:var(--border)}.learn-landing-head h2{margin:var(--s-2) 0 0;font-family:var(--f-body);font-size:var(--fs-section-title);font-weight:var(--w-semibold);letter-spacing:-.01em}.learn-landing-rail{display:grid;grid-auto-columns:calc((100% - 2 * var(--s-4)) / 3.3);grid-auto-flow:column;gap:var(--s-4);overflow-x:auto;padding-bottom:var(--s-1);scroll-snap-type:x mandatory;scrollbar-width:none}.learn-landing-rail::-webkit-scrollbar{display:none}.learn-landing-course{display:block;color:var(--c-ink);scroll-snap-align:start;text-decoration:none}.learn-landing-course img{display:block;width:100%;aspect-ratio:16 / 9;margin-bottom:var(--s-3);object-fit:cover;background:var(--c-bg-2)}.learn-landing-course-meta{margin:0 0 var(--s-1);color:var(--c-ink-3);font-size:var(--fs-2xs)}.learn-landing-course h3{margin:0 0 var(--s-2);font-family:var(--f-body);font-size:var(--fs-item-title);font-weight:var(--w-semibold);line-height:1.45}.learn-landing-course p:not(.learn-landing-course-meta){display:-webkit-box;margin:0 0 var(--s-2);overflow:hidden;color:var(--c-ink-2);font-size:var(--fs-sm);line-height:1.65;-webkit-box-orient:vertical;-webkit-line-clamp:3}.learn-landing-more{color:var(--c-accent-text);font-size:var(--fs-2xs);font-weight:var(--w-medium)}.learn-landing-progress{position:relative;height:1px;margin-top:var(--s-5);background:var(--c-line)}.learn-landing-progress span{position:absolute;top:-1px;left:0;width:30%;height:3px;background:var(--c-accent)}.learn-landing-tasks{padding-block:var(--landing-section-space)}.learn-landing-tasks .learn-landing-head{display:block;text-align:center}.learn-landing-task-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--s-4);margin:0 0 var(--s-6);padding:0;list-style:none}.learn-landing-task{display:block;color:var(--c-ink);text-decoration:none}.learn-landing-task-number{display:block;color:var(--c-accent);font-family:var(--f-number-display);font-size:var(--fs-index-number);font-variant-numeric:lining-nums;line-height:.9}.learn-landing-task h3{min-height:2.9em;margin:var(--s-2) 0 var(--s-3);font-family:var(--f-body);font-size:var(--fs-base);font-weight:var(--w-semibold);line-height:1.45}.learn-landing-tile{position:relative;overflow:hidden;aspect-ratio:4 / 3;background:var(--c-bg-2)}.learn-landing-tile img{display:block;width:100%;height:100%;object-fit:contain}.learn-landing-tile-detail{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:space-between;padding:var(--s-3);background:var(--c-accent-tint);opacity:0;transition:opacity var(--t) var(--ease)}.learn-landing-tile-detail p{margin:0;color:var(--c-ink);font-size:var(--fs-sm);line-height:1.65}.learn-landing-task:focus-visible .learn-landing-tile-detail{opacity:1}@media(hover:hover)and (pointer:fine){.learn-landing-task:hover .learn-landing-tile-detail{opacity:1}}.learn-landing-center{text-align:center}.learn-landing-all-head{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-4);padding:var(--s-7) 0 var(--s-5)}.learn-landing-all-head h2{margin:var(--s-2) 0 var(--s-2);font-family:var(--f-body);font-size:var(--fs-section-title);font-weight:var(--w-semibold)}.learn-landing-all-head p{margin:0;color:var(--c-ink-2);font-size:var(--fs-base)}.learn-landing-tools{display:flex;flex-wrap:wrap;gap:var(--s-2)}@media(max-width:760px){.learn-landing-hero{padding-block:var(--s-7) var(--s-6)}.learn-landing-rail{grid-auto-columns:78%}.learn-landing-task-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(prefers-reduced-motion:reduce){.learn-landing-button,.learn-landing-tile-detail{transition:none}}