@import url('https://fonts.googleapis.com/css2?family=Gowun+Batang:wght@400;700&family=Noto+Sans+KR:wght@400;500;600;700;800&display=swap');
.classroom-content{--ink:#263b3b;--navy:#173d3e;--paper:#f7f5ef;--muted:#61716b;--line:#dce1d8;--accent:#cc6c32;font-family:'Noto Sans KR',sans-serif;color:var(--ink);background:var(--paper);font-size:16px}.classroom-content *{box-sizing:border-box}.classroom-content{margin:0}.classroom-content button,.classroom-content select,.classroom-content input{font:inherit}.classroom-content a{color:inherit}.classroom-content button,.classroom-content a,.classroom-content input,.classroom-content select{touch-action:manipulation}.classroom-content button{cursor:pointer;color:inherit;background:white;border:1px solid var(--line);border-radius:10px;min-height:44px;padding:9px 16px}.classroom-content button:disabled{opacity:.35;cursor:default}.classroom-content button:hover:not(:disabled){border-color:var(--accent)}.classroom-content button:focus-visible,.classroom-content a:focus-visible,.classroom-content input:focus-visible,.classroom-content select:focus-visible,.classroom-content 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.book{background:white;border:1px solid var(--line);border-radius:18px;overflow:hidden}.classroom-content .cover-button{width:100%;padding:0;border:0;border-radius:0;position:relative;display:block;overflow:hidden}.classroom-content .cover-button img{width:100%;height:auto;aspect-ratio:1.5;object-fit:cover;display:block;transition:transform .5s}.classroom-content .cover-button:hover img{transform:scale(1.035)}.classroom-content .cover-play{position:absolute;bottom:15px;right:15px;width:42px;height:42px;border-radius:50%;background:#ffffffed;display:grid;place-items:center;font-size:.85rem}.classroom-content .book-.classroom-content{padding:24px}.classroom-content .book-tag{font-size:.75rem;color:#62746b}.classroom-content .book h2{font-family:'Gowun Batang',serif;font-size:1.6rem;line-height:1.5;margin:10px 0 16px;min-height:2.8em}.classroom-content .book p{font-size:.8rem;line-height:1.8;color:var(--muted)}.classroom-content .book p span{white-space:nowrap}.classroom-content 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.story-title>span{font-variant-numeric:tabular-nums;white-space:nowrap;font-size:.8rem;color:var(--muted)}.classroom-content .screen{overflow:hidden;border-radius:15px;background:#172b2c;box-shadow:0 10px 40px #193c3b12}.classroom-content .image-shell{position:relative;overflow:hidden;aspect-ratio:16/8.6;background:#e6dfcc;max-height:52vh}.classroom-content .image-shell>img{width:100%;height:100%;object-fit:cover;display:block;transform:scale(1.015)}.classroom-content .image-shell.is-playing>img{animation:gentle-pan 32s ease-in-out forwards}.classroom-content .scene-label{position:absolute;top:15px;left:18px;padding:7px 11px;background:#fffaf0ed;color:#37453e;border-radius:7px;font-size:.75rem;backdrop-filter:blur(8px)}.classroom-content .picture-note{position:absolute;bottom:16px;left:20px;max-width:calc(100% - 40px);padding:9px 14px;background:#fffaf2f0;border-radius:8px;color:#39473e;font-size:.9rem;font-weight:600;line-height:1.6;box-shadow:0 2px 14px #00000010}.classroom-content .picture-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:70px;height:70px;min-height:70px;border-radius:50%;background:#fffdf2e6;color:var(--navy);border:1px solid #ffffff77;font-size:1.5rem;padding:0 0 0 5px;box-shadow:0 5px 25px #0002}.classroom-content .caption-panel{min-height:104px;padding:17px 7%;display:flex;align-items:center;justify-content:center;text-align:center;color:#fffef8;background:#172b2c}.classroom-content .caption-panel p{font-size:1.3rem;line-height:1.65;margin:0;max-width:820px;letter-spacing:-.015em}.classroom-content .track-line{height:10px;position:relative;display:flex;align-items:center;background:#172b2c}.classroom-content .track-line input{width:100%;margin:0;height:8px;accent-color:#eba269;cursor:pointer}.classroom-content .controls{padding:15px 5px 8px}.classroom-content .transport{display:flex;align-items:center;justify-content:center;gap:12px}.classroom-content .transport 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0}.classroom-content .lesson-details .text-control{background:transparent;border-color:transparent;font-size:.8rem;padding-left:0}.classroom-content .quiz-panel{background:white;border:1px solid var(--line);padding:28px;border-radius:16px;margin-top:22px}.classroom-content .quiz-panel h2{font-size:1.15rem;line-height:1.7}.classroom-content .choices{display:grid;grid-template-columns:1fr 1fr;gap:12px}.classroom-content .choices button{display:flex;align-items:flex-start;text-align:left;gap:12px;line-height:1.8;font-size:.9rem}.classroom-content .choices button>span{background:#edf1e7;border-radius:50%;padding:0 8px}.classroom-content .choices button[aria-pressed=true]{background:#eef4e9;border-color:#6a8d5e}.classroom-content .answer{background:#fff2dc;padding:18px;border-radius:10px;margin-top:18px;font-size:.9rem;line-height:1.9}.classroom-content .answer.correct{background:#edf4e7}.classroom-content .answer p{margin-bottom:0}.classroom-content .urgent{font-size:.75rem;line-height:1.8;background:#fff0db;border-left:3px solid #b97338;padding:8px 12px;margin:0 0 12px}.classroom-content .ending{max-width:780px;width:92vw;margin:35px auto 50px;text-align:center}.classroom-content .ending>img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;border-radius:18px;margin:22px 0}.classroom-content .ending h1{font-family:'Gowun Batang',serif;font-size:2rem}.classroom-content .ending p{line-height:1.9;font-size:1.1rem}.classroom-content .ending>div{display:flex;justify-content:center;gap:15px;flex-wrap:wrap;margin-top:25px}.classroom-content .primary-link{display:inline-flex;align-items:center;text-decoration:none;background:var(--navy);color:white;border-radius:10px;padding:12px 20px}.classroom-content .ending details{padding:25px 0;line-height:2}.classroom-content .ending summary{cursor:pointer}.classroom-content .ending details button{display:block;margin:12px auto}html.large-captions .classroom-content .caption-panel p{font-size:1.65rem}html.large-captions .classroom-content .caption-panel{min-height:130px}@keyframes gentle-pan{from{transform:scale(1.015)}to{transform:scale(1.055)}}@media(prefers-reduced-motion:reduce){.classroom-content *,.classroom-content *:before,.classroom-content *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media(max-width:850px){.classroom-content .books{gap:15px}.classroom-content .book-.classroom-content{padding:18px}.classroom-content .book h2{font-size:1.35rem}.classroom-content .book p span{display:block}.classroom-content .cinema{width:94vw}.classroom-content .chapters{grid-template-columns:repeat(3,1fr)}.classroom-content .image-shell{max-height:48vh}.classroom-content .preferences{gap:15px}.classroom-content .shelf-heading h1 br{display:block}}
@media(max-width:560px){.classroom-content .site-header{height:55px;padding:0 5vw}.classroom-content .brand-sub{display:none}.classroom-content .brand-mark{width:28px;height:28px;font-size:1.1rem}.classroom-content .site-header>a:last-child{font-size:.65rem}.classroom-content .shelf{padding:28px 5vw}.classroom-content .shelf-heading h1{font-size:2rem}.classroom-content .books{grid-template-columns:1fr;gap:22px}.classroom-content .book h2{font-size:1.6rem;min-height:0}.classroom-content .book-.classroom-content{padding:20px}.classroom-content .book p span{display:inline}.classroom-content .book-start{margin-top:16px}.classroom-content .book-tag{font-size:.75rem}.classroom-content .cover-button img{aspect-ratio:1.7}.classroom-content .site-footer{display:block;font-size:.65rem}.classroom-content .site-footer span{display:block;margin:3px 0}.classroom-content .cinema{width:94vw;margin-top:10px}.classroom-content .story-header{gap:10px;font-size:.65rem}.classroom-content .story-header>span{max-width:130px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.classroom-content .story-title{margin:8px 2px 12px;gap:12px}.classroom-content .story-title h1{font-size:1.25rem}.classroom-content .story-title>span{font-size:.7rem}.classroom-content .screen{border-radius:10px}.classroom-content .image-shell{aspect-ratio:16/10;max-height:none}.classroom-content .scene-label{top:10px;left:10px;font-size:.65rem;padding:5px 8px}.classroom-content .picture-note{bottom:10px;left:10px;max-width:calc(100% - 20px);font-size:.7rem;padding:6px 9px}.classroom-content .picture-play{width:54px;height:54px;min-height:54px;font-size:1.1rem}.classroom-content .caption-panel{min-height:128px;padding:13px 17px}.classroom-content .caption-panel p{font-size:1.03rem;line-height:1.8}html.large-captions .classroom-content .caption-panel p{font-size:1.3rem}html.large-captions .classroom-content .caption-panel{min-height:158px}.classroom-content .controls{padding:11px 3px 5px}.classroom-content .transport{gap:6px}.classroom-content .transport button{padding:8px 12px;font-size:.75rem}.classroom-content .transport .main-play{min-width:114px;min-height:44px;font-size:.9rem}.classroom-content .transport #rewind{font-size:.7rem}.classroom-content .play-info{font-size:.65rem;gap:10px;margin:10px 0 12px}.classroom-content .play-info #clock{white-space:nowrap}.classroom-content .preferences{gap:10px}.classroom-content .preferences label{gap:5px}.classroom-content .preferences select{font-size:.7rem;max-width:138px;padding:5px}.classroom-content .preferences button{font-size:.7rem;padding:5px 8px}.classroom-content .narrator-label{font-size:.6rem}.classroom-content .chapters{gap:6px;margin-top:18px}.classroom-content .chapters button{font-size:.65rem;padding:9px}.classroom-content .quiz-panel{padding:18px}.classroom-content .choices{grid-template-columns:1fr}.classroom-content .urgent{font-size:.65rem;padding:7px 10px}.classroom-content .lesson-details{margin-top:18px}.classroom-content .ending h1{font-size:1.6rem}.classroom-content .ending p{font-size:1rem}}

/* Readable controls and essential guidance on narrow screens. */
.classroom-content .site-header>a:last-child,.classroom-content .eyebrow,.classroom-content .book-tag,.classroom-content .book-.classroom-content p,.classroom-content .scene-label,.classroom-content .picture-note,.classroom-content .play-info,.classroom-content .preferences label,.classroom-content .preferences select,.classroom-content .preferences button,.classroom-content .chapters button,.classroom-content .urgent{font-size:max(.875rem,14px)}
.classroom-content .brand-sub,.classroom-content .narrator-label,.classroom-content .site-footer{font-size:max(.75rem,12px)}
.classroom-content .preferences{flex-wrap:wrap}.classroom-content .preferences select,.classroom-content .preferences button{min-height:44px}.classroom-content .play-info{flex-wrap:wrap}.classroom-content .scene-label,.classroom-content .picture-note{line-height:1.5}.classroom-content .urgent{line-height:1.7}
@media(max-width:640px){.classroom-content .transport{flex-wrap:wrap}.classroom-content .transport button,.classroom-content .transport #rewind{font-size:.875rem}.classroom-content .preferences select{max-width:100%}.classroom-content .chapters{grid-template-columns:repeat(2,minmax(0,1fr))}.classroom-content .site-header{height:auto;min-height:68px;padding-top:10px;padding-bottom:10px;flex-wrap:wrap}.classroom-content .site-footer{flex-wrap:wrap}.classroom-content .picture-note{font-size:.875rem}.classroom-content .caption-panel p{font-size:1.125rem}}
.classroom-content .library-tools{display:flex;gap:20px;align-items:end;flex-wrap:wrap;margin:28px 0 12px}.classroom-content .library-tools label{display:flex;flex-direction:column;gap:9px;font-size:.8rem;color:var(--muted);flex:1;min-width:180px}.classroom-content .library-tools select,.classroom-content .library-tools input{color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;min-height:48px;width:100%;font-size:.9rem}.classroom-content .result-count{font-size:.8rem;color:var(--muted);margin:17px 0}.classroom-content .empty-stories{grid-column:1/-1;padding:40px 10px;text-align:center}.classroom-content .cover-button img{aspect-ratio:16/9}.classroom-content .chapters{grid-template-columns:repeat(auto-fit,minmax(110px,1fr))}@media(max-width:600px){.classroom-content .chapters{grid-template-columns:repeat(2,minmax(0,1fr))}.classroom-content .library-tools{gap:14px}.classroom-content .library-tools label{min-width:100%}}

/* Homepage brand and completion navigation */
.classroom-content .brand-logo{display:block;width:240px;height:auto;max-width:100%}.classroom-content .ending-actions{display:flex;justify-content:center;align-items:stretch;gap:12px;flex-wrap:wrap;margin:24px 0}.classroom-content .ending-actions .primary-link{justify-content:center;min-height:48px;font-weight:700}.classroom-content .ending-actions button{min-height:48px}.classroom-content .ending h1{margin:14px 0}.classroom-content .ending>img{margin-top:28px}@media(max-width:560px){.classroom-content .site-header{height:auto;min-height:64px;gap:12px;padding:12px 4vw}.classroom-content .brand-logo{width:190px}.classroom-content .brand{min-width:0}.classroom-content .site-header>a:last-child{max-width:95px;font-size:12px;line-height:1.5;flex-shrink:0}.classroom-content .ending-actions{flex-direction:column}.classroom-content .ending-actions>*{width:100%}.classroom-content .ending{margin-top:24px}}

.classroom-content .library-tools{display:grid;grid-template-columns:1fr 1fr 1.4fr;gap:1rem}.classroom-content .picture-note{max-width:calc(100% - 2rem);white-space:normal;overflow-wrap:anywhere;line-height:1.45}.classroom-content .lesson-details li p{font-size:.9rem;line-height:1.6;color:#435266;margin:.35rem 0}.classroom-content .lesson-details a{overflow-wrap:anywhere}@media(max-width:700px){.classroom-content .library-tools{grid-template-columns:1fr 1fr}.classroom-content .library-tools label:last-child{grid-column:1/-1}.classroom-content .picture-note{font-size:.9rem}}@media(max-width:380px){.classroom-content .library-tools{grid-template-columns:1fr}.classroom-content .library-tools label:last-child{grid-column:auto}}

.classroom-content .site-header>a:last-child{white-space:nowrap}@media(max-width:560px){.classroom-content .site-header>a:last-child{max-width:none}}

/* Fit complete artwork into a viewport-height constrained stage. */
.classroom-content .image-shell{width:100%;background:#eee8dc}.classroom-content .image-shell>img{object-fit:contain;transform:none}.classroom-content .image-shell.is-playing>img{animation:none}@media(max-width:560px){.classroom-content .image-shell{aspect-ratio:16/9}}

.classroom-content .volume-controls{display:flex;align-items:center;flex-wrap:wrap;gap:10px;width:100%;padding:12px 0;border-top:1px solid var(--line)}.classroom-content .volume-controls label{font-size:.85rem}.classroom-content .volume-controls input{width:clamp(100px,25vw,240px);min-width:0;min-height:44px;accent-color:var(--navy);flex:1 1 100px;max-width:240px}.classroom-content .volume-controls output{min-width:4em;font-size:.85rem;font-variant-numeric:tabular-nums}.classroom-content .volume-controls small{flex-basis:100%;font-size:.75rem;color:var(--muted);line-height:1.6}.classroom-content .volume-controls button{min-width:88px}@media(max-width:380px){.classroom-content .volume-controls{gap:8px}.classroom-content .volume-controls button{padding-inline:10px;min-width:80px}.classroom-content .volume-controls output{min-width:3.5em}}

.classroom-content .format-nav{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0}.classroom-content .format-nav>*{padding:12px 18px;border:1px solid #a7b8b7;border-radius:24px;color:#173e3a;font-weight:700}.classroom-content .format-nav span{background:#173e3a;color:white}.classroom-content .longform-entry{display:flex;gap:24px;align-items:center;justify-content:space-between;padding:24px;margin-bottom:26px;background:#e9f0ec;border-radius:18px}.classroom-content .longform-entry strong{font-size:1.2rem}.classroom-content .longform-entry p{line-height:1.7;margin:8px 0 0}.classroom-content .longform-entry a{white-space:nowrap;padding:12px 18px;border-radius:12px;background:#173e3a;color:white;font-weight:700}@media(max-width:640px){.classroom-content .longform-entry{align-items:flex-start;flex-direction:column;padding:20px}.classroom-content .format-nav{font-size:15px}}