.jf-classroom{margin:16px 0 24px;background:#fbf9f4;border:1px solid #ded8c8;border-radius:22px;overflow:hidden;color:#293c32}.jf-classroom>[hidden],.jf-classroom [hidden]{display:none!important}.jf-classroom>.jf-guide-entry{padding:20px 24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap;cursor:pointer;list-style:none}.jf-classroom>.jf-guide-entry strong{font-size:21px;color:#314c3c}.jf-classroom>.jf-guide-entry span{font-size:14px;color:#76624a}.jf-classroom>.jf-guide-entry::after{content:'열어보기 ＋';margin-left:auto;font-size:13px;color:#536550}.jf-classroom[open]>.jf-guide-entry::after{content:'접어두기 −'}.jf-classroom .jf-school-index{padding:30px clamp(16px,4vw,44px) 38px}.jf-classroom .jf-school-lead{max-width:780px;margin-bottom:30px}.jf-classroom .jf-school-lead>p:first-child,.jf-classroom .jf-series-label{font-size:12px;font-weight:750;letter-spacing:.12em;color:#85603f}.jf-classroom .jf-school-lead h2{font-family:Batang,serif;font-size:clamp(27px,3vw,40px);font-weight:500;line-height:1.4;margin:10px 0 14px}.jf-classroom .jf-school-lead p{line-height:1.8;color:#586456}.jf-classroom .jf-series-head{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap;margin:34px 0 17px}.jf-classroom .jf-series-head h3{font-size:23px;margin:0}.jf-classroom .jf-series-head p{font-size:14px;color:#687264;margin:0}.jf-classroom .jf-school-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.jf-classroom button.jf-topic-card{display:flex;flex-direction:column;text-align:left;border:1px solid #ded6c6;padding:0;border-radius:16px;background:#fffdfa;color:#304234;overflow:hidden;cursor:pointer;min-width:0;box-shadow:0 3px 12px #45331908;transition:transform .15s,box-shadow .15s}.jf-classroom button.jf-topic-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px #45331915}.jf-classroom .jf-topic-card img{width:100%;height:148px;object-fit:cover;display:block;background:#ece6da}.jf-classroom .jf-topic-card>span{padding:18px;display:flex;flex-direction:column;gap:9px;flex:1}.jf-classroom .jf-topic-card small{font-size:12px;letter-spacing:.06em;color:#8a684a}.jf-classroom .jf-topic-card strong{font-size:19px;line-height:1.45;font-weight:650;word-break:keep-all}.jf-classroom .jf-topic-card em{font-size:14px;font-style:normal;color:#6b7569;line-height:1.65}.jf-classroom .jf-topic-card b{font-size:13px;color:#4b6c51;margin-top:auto;padding-top:8px}.jf-classroom .jf-library-tools{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.jf-classroom .jf-library-tools button,.jf-classroom .jf-reader-toolbar button{font-size:14px;background:#edf0e7;color:#36543d;border:1px solid #ced5c4;border-radius:24px;padding:10px 16px;cursor:pointer;white-space:normal;line-height:1.5}.jf-classroom .jf-reader-toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:#f0eee5;border-bottom:1px solid #ddd8c8;padding:16px 22px}.jf-classroom .jf-reader-toolbar strong{font-size:17px;font-weight:600;line-height:1.5}.jf-classroom [data-classroom-reader]{scroll-margin-top:100px;outline:none;padding-bottom:24px}.jf-classroom [data-classroom-status]{margin:10px 24px;line-height:1.6;color:#75603f}.jf-classroom .jf-foundation-fragment .jf-guide-body{padding:0}.jf-classroom .jf-foundation-fragment .jf-guide-section{margin:0;border:0}.jf-classroom .jf-foundation-fragment .jf-guide-lesson-body{padding-top:12px}.jf-classroom .jf-foundation-fragment .jf-guide-lesson-summary{padding:22px}.jf-classroom .jf-foundation-fragment .jf-guide-lesson{background:#fffdf8}.jf-classroom .jf-mh{padding-top:20px}.jf-classroom .jf-mh__chapter{padding-top:0}.jf-classroom .jf-mh__directory,.jf-classroom .jf-mh__footer{margin-top:0}.jf-classroom .jf-mh__playlist button[data-guide-play]{background:#3e5a46;color:#fff;border-color:#3e5a46;cursor:pointer;font-size:14px}.jf-classroom .jf-history-link{display:block;margin-top:8px;font-size:13px;color:#3e6248}.jf-classroom .jf-history-recording{display:block;font-size:12px;line-height:1.6;color:#64715e;margin-top:8px}.jf-classroom :focus-visible{outline:3px solid #a77741;outline-offset:4px}.jf-classroom .jf-school-note{font-size:12px;color:#747b6c;line-height:1.7;margin-top:26px}
.jf-classroom .jf-series-doors{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0 34px}.jf-classroom .jf-series-doors button{padding:22px;text-align:left;border-radius:16px;background:linear-gradient(110deg,#314637e8,#31463785),url('classical-history/images/violin-480.webp') center/cover;color:#fffcf1;border:0;cursor:pointer;line-height:1.6}.jf-classroom .jf-series-doors button+button{background-image:linear-gradient(110deg,#513928ed,#51392885),url('classical-history/images/romantic-hall-480.webp')}.jf-classroom .jf-series-doors small,.jf-classroom .jf-series-doors span{display:block;font-size:12px;color:#ead9b8}.jf-classroom .jf-series-doors strong{display:block;font-size:clamp(17px,2.2vw,25px);font-family:Batang,serif;margin:9px 0 13px;line-height:1.5}.jf-classroom #jf-course-one,.jf-classroom #jf-course-two{scroll-margin-top:105px}.jf-classroom [data-classroom-reader]>.jf-guide-connection-note{display:grid;gap:7px;padding:16px 22px;margin:0 0 18px;border:0;background:#edf1e8;font-size:14px;line-height:1.7}.jf-classroom [data-classroom-reader]>.jf-guide-connection-note strong{color:#3c5643}.jf-classroom [data-classroom-reader]>.jf-guide-connection-note span{color:#556451}
.jf-classroom .jf-series-doors button{display:block}.jf-classroom .jf-school-index{scroll-margin-top:100px}.jf-classroom [hidden] *::after,.jf-classroom [hidden] *::before{content:none!important}
@media(max-width:850px){.jf-classroom .jf-school-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.jf-classroom .jf-topic-card img{height:132px}}
@media(max-width:480px){.jf-classroom>.jf-guide-entry{padding:17px;gap:6px}.jf-classroom>.jf-guide-entry strong{font-size:20px}.jf-classroom>.jf-guide-entry span{font-size:12px}.jf-classroom>.jf-guide-entry::after{font-size:12px}.jf-classroom .jf-school-index{padding:22px 13px}.jf-classroom .jf-school-grid{gap:10px}.jf-classroom .jf-topic-card img{height:110px}.jf-classroom .jf-topic-card>span{padding:13px;gap:7px}.jf-classroom .jf-topic-card strong{font-size:16px}.jf-classroom .jf-topic-card em{font-size:12px}.jf-classroom .jf-topic-card small{font-size:10px}.jf-classroom .jf-series-head h3{font-size:20px}.jf-classroom .jf-reader-toolbar{padding:12px;gap:10px}.jf-classroom .jf-reader-toolbar strong{font-size:15px;flex:1}.jf-classroom .jf-mh__chapter-grid{display:block}.jf-classroom .jf-mh__playlist{margin-top:22px}.jf-classroom .jf-mh__hero-note{color:#f4ddb9}.jf-classroom .jf-mh__search input,.jf-classroom .jf-mh__search select{min-width:0;max-width:100%}}
@media(max-width:340px){.jf-classroom .jf-school-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){.jf-classroom button.jf-topic-card{transition:none}}

/* JF4288: classroom-only wrapping, native swipe strip and uncropped images. */
.jf-classroom .jf-school-index,.jf-classroom .jf-school-grid{min-width:0;max-width:100%;box-sizing:border-box}
.jf-classroom button.jf-topic-card,.jf-classroom .jf-series-doors button{box-sizing:border-box;min-width:0;max-width:100%;white-space:normal!important;text-overflow:clip;align-items:stretch;justify-content:flex-start;height:auto}
.jf-classroom button.jf-topic-card>span{box-sizing:border-box;width:100%;min-width:0;max-width:100%;align-items:stretch;text-align:left}
.jf-classroom button.jf-topic-card :is(small,strong,em,b),.jf-classroom .jf-series-doors :is(small,strong,span){box-sizing:border-box;min-width:0;max-width:100%;width:auto;white-space:normal!important;overflow:visible;text-overflow:clip;overflow-wrap:anywhere;word-break:normal;-webkit-line-clamp:unset;line-clamp:unset;text-align:left;flex-shrink:0}
.jf-classroom button.jf-topic-card img{height:auto!important;aspect-ratio:auto!important;object-fit:contain!important;width:100%;max-height:none}
.jf-classroom .jf-series-doors{grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;min-width:0;max-width:100%;box-sizing:border-box}
.jf-classroom .jf-series-doors button{padding:0;background:#314637;overflow:hidden;display:flex;flex-direction:column;border:1px solid #ded6c6}
.jf-classroom .jf-series-doors button+button{background:#513928}
.jf-classroom .jf-series-doors .jf-series-art{display:block;width:100%;height:190px;object-fit:contain!important;aspect-ratio:auto;background:#eae5da;flex:none}
.jf-classroom .jf-series-doors .jf-series-copy{display:block;padding:20px;width:100%;box-sizing:border-box}
.jf-classroom .jf-series-swipe-hint{display:none;color:#65715f;font-size:13px;line-height:1.6;margin:-22px 0 30px}
/* Retain comparative instrument frames; contain preserves their designed scale. */
.jf-classroom.jf-classic-guide img{object-fit:contain!important;object-position:center!important}
.jf-classroom.jf-classic-guide .jf-guide-lesson-media img,.jf-classroom.jf-classic-guide .jf-guide-lesson-media--wide img,.jf-classroom.jf-classic-guide .jf-guide-scene img{height:auto!important;aspect-ratio:auto!important;max-height:none!important}
.jf-classroom.jf-classic-guide .jf-guide-lesson-media{align-items:center}
.jf-classroom.jf-classic-guide .jf-guide-hero__art{height:auto!important}
.jf-classroom.jf-classic-guide .jf-guide-hero__art img{height:auto!important;max-height:none!important}
.jf-classroom .jf-mh .jf-mh__hero,.jf-classroom .jf-mh .jf-mh__chapter-banner{display:flex;flex-direction:column;align-items:stretch;min-height:0;isolation:auto}
.jf-classroom .jf-mh .jf-mh__hero:after,.jf-classroom .jf-mh .jf-mh__chapter-banner:after{display:none}
.jf-classroom .jf-mh img.jf-mh__hero-image,.jf-classroom .jf-mh img.jf-mh__chapter-image{position:static;inset:auto;z-index:auto;width:100%;height:auto;aspect-ratio:auto}
.jf-classroom .jf-mh .jf-mh__hero-inner,.jf-classroom .jf-mh .jf-mh__chapter-banner-copy{width:100%;max-width:none;box-sizing:border-box}
.jf-classroom .jf-mh .jf-mh__context-gallery img,.jf-classroom .jf-mh .jf-mh__era-card img{height:auto!important;aspect-ratio:auto!important}
@media(max-width:700px){
 .jf-classroom .jf-series-doors{display:flex;flex-flow:row nowrap!important;justify-content:flex-start;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scroll-padding-inline:0;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;gap:14px;padding:0 0 12px;margin-bottom:27px;scrollbar-width:thin;scrollbar-color:#947f60 #e8e3d8}
 .jf-classroom .jf-series-doors button{flex:0 0 90%;width:90%;max-width:90%;min-width:0;scroll-snap-align:start;scroll-snap-stop:always}
 .jf-classroom .jf-series-doors .jf-series-art{height:190px}
 .jf-classroom .jf-series-doors strong{font-size:22px}
 .jf-classroom .jf-series-swipe-hint{display:block}
 .jf-classroom .jf-school-grid{grid-template-columns:minmax(0,1fr);gap:18px}
 .jf-classroom button.jf-topic-card>span{padding:19px;gap:10px}
 .jf-classroom button.jf-topic-card strong{font-size:20px;line-height:1.55}
 .jf-classroom button.jf-topic-card em{font-size:15px;line-height:1.7}
 .jf-classroom button.jf-topic-card small{font-size:12px}
 .jf-classroom button.jf-topic-card b{font-size:14px}
 .jf-classroom.jf-classic-guide .jf-guide-lesson-media img{width:min(100%,380px)!important;margin-inline:auto}
}

/* JF4289: matched artwork frames with soft edges, no cropping. */
.jf-classroom .jf-series-doors button,.jf-classroom .jf-series-doors button+button{background:#ede9df;color:#304234;border-color:#ded8c9}
.jf-classroom .jf-series-doors .jf-series-art{height:230px!important;width:min(100%,230px)!important;margin:12px auto 0;background:transparent;object-fit:contain!important;-webkit-mask-image:radial-gradient(ellipse 72% 76% at 50% 46%,#000 40%,transparent 94%);mask-image:radial-gradient(ellipse 72% 76% at 50% 46%,#000 40%,transparent 94%)}
.jf-classroom .jf-series-doors button:first-child .jf-series-art{-webkit-mask-image:none;mask-image:none}
.jf-classroom .jf-series-doors .jf-series-copy{padding:8px 22px 24px;background:transparent;flex:1}
.jf-classroom .jf-series-doors small,.jf-classroom .jf-series-doors span{color:#756044}
.jf-classroom .jf-series-doors strong{color:#304234}
.jf-classroom .jf-image-credit{padding:16px 22px;margin:12px 0 0;border-top:1px solid #ded8c9;font-size:12px;color:#6c7467;line-height:1.7}
.jf-classroom .jf-mh .jf-mh__instrument-glossary{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.jf-classroom .jf-mh .jf-mh__instrument-glossary>span{grid-column:1/-1}
.jf-classroom .jf-mh .jf-mh__instrument-glossary>div{display:flex;flex-direction:column;gap:8px;min-width:0}
.jf-classroom .jf-mh .jf-mh__instrument-glossary img{width:100%;height:140px;object-fit:contain!important;background:#f5f1e7;border-radius:12px}

/* JF4313: compact, equal square thumbnails for the classroom topic index only. */
.jf-classroom .jf-school-grid{align-items:stretch}
.jf-classroom .jf-school-grid>button.jf-topic-card{height:100%;align-items:stretch}
.jf-classroom .jf-school-grid>button.jf-topic-card>img{
 box-sizing:border-box;display:block;width:180px!important;height:180px!important;
 min-width:0;max-width:calc(100% - 36px);max-height:none;aspect-ratio:1/1!important;
 object-fit:contain!important;object-position:center!important;flex:0 0 auto;
 margin:18px auto 0;padding:7px;border-radius:12px;background:#f3efe6;
}
.jf-classroom .jf-school-grid>button.jf-topic-card>span{flex:1;min-height:0}
.jf-classroom .jf-school-grid>button.jf-topic-card>span>b{margin-top:auto}
@media(max-width:700px){
 .jf-classroom .jf-school-grid>button.jf-topic-card>img{width:144px!important;height:144px!important;margin-top:16px}
}

/* JF4314: full-card-width square artwork, not small thumbnails. */
.jf-classroom .jf-school-grid>button.jf-topic-card>img{
 width:100%!important;height:auto!important;max-width:100%!important;
 aspect-ratio:1/1!important;object-fit:contain!important;object-position:center!important;
 margin:0!important;padding:0!important;border-radius:0!important;flex:0 0 auto;
 background:#f3efe6;
}

/* JF4315: fill the two landscape index artworks without letterboxing. */
.jf-classroom .jf-school-grid>button.jf-topic-card:is([data-topic="mh-era-early-romantic"],[data-topic="mh-era-modern"])>img{
 object-fit:cover!important;object-position:center!important;
}