@font-face{font-family:Pretendard;src:url('../design-preview/PretendardVariable.woff2')}*{box-sizing:border-box}body{margin:0;background:#fff;color:#24272c;font:15px/1.65 Pretendard,sans-serif;letter-spacing:0}button,input,select,textarea{font:inherit}button,a,input,textarea{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}button{border:1px solid #dce0e5;border-radius:4px;background:white;padding:9px 16px;font-weight:600;color:inherit;display:inline-flex;align-items:center;justify-content:center;gap:8px}button:hover{background:#f3f5f8}a:hover{color:#245ddd}button:disabled{opacity:.4;cursor:default}i{display:inline-flex;align-items:center}i svg{width:19px;height:19px}.primary{background:#245ddd;border-color:#245ddd;color:white}.primary:hover{background:#1e4ebc;color:white}.preview-band{background:#23272c;color:#fff;padding:7px max(24px,calc((100% - 1200px)/2));display:flex;gap:20px;justify-content:space-between;font-size:10px;font-weight:650}.preview-band span{color:#c5cbd3;font-weight:400}header{max-width:1248px;padding:22px 24px;margin:auto;display:flex;gap:48px;align-items:center;border-bottom:1px solid #e7e9ed}.brand{font-size:23px;font-weight:850;line-height:1.1}.brand span{display:block;font-size:9px;font-weight:600;color:#727b87;margin-top:7px}nav{display:flex;gap:30px;align-self:stretch;align-items:center;font-size:14px;font-weight:650}nav a.active{color:#245ddd}.account{margin-left:auto;border:0;font-size:12px;padding:8px 0}.account i{border:1px solid #e1e5ea;border-radius:50%;padding:6px}main{max-width:1248px;margin:auto;padding:40px 24px 70px;min-height:70vh}h1,h2,h3,h4,p{margin:0}h1{font-size:32px;line-height:1.35;font-weight:750}h2{font-size:23px;line-height:1.4}h3{font-size:19px;line-height:1.5}small,.muted{color:#687381}.eyebrow{font-size:11px;font-weight:700;color:#687381;margin-bottom:10px}.lead{color:#697382;margin-top:12px;font-size:15px}.intro-line{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:32px}.intro-line .link{font-size:13px;color:#245ddd;display:flex;gap:8px;align-items:center;white-space:nowrap}.catalog-tools{display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid #e4e7ec;margin-bottom:28px}.tabs{display:flex;gap:25px}.tabs button{border:0;border-radius:0;border-bottom:2px solid transparent;background:transparent;padding:14px 0;font-size:14px;color:#77808c}.tabs button.active{color:#24272c;border-color:#24272c}.search{display:flex;align-items:center;gap:9px;padding:8px 0}.search input{border:0;background:none;width:200px;outline-offset:4px;font-size:13px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.product{min-width:0;display:block}.cover{aspect-ratio:1.65;position:relative;overflow:hidden;border-radius:5px;background:#eef1f4}.cover img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .25s}.product:hover img{transform:scale(1.025)}.cover .cover-tag{position:absolute;left:14px;top:14px;font-size:10px;background:white;padding:4px 8px;color:#272d34;border-radius:3px;font-weight:700}.product .type{margin:17px 0 5px;font-size:11px;color:#566371;font-weight:600}.product h3{color:#24272c}.product .desc{color:#6c7581;font-size:13px;margin-top:8px;min-height:42px}.meta{font-size:12px;color:#74808e;margin-top:14px;display:flex;gap:12px;flex-wrap:wrap}.price{display:flex;gap:8px;align-items:center;border-top:1px solid #e7e9ed;padding-top:14px;margin-top:17px;color:#24272c;font-size:20px;font-weight:750}.price small{font-size:11px;font-weight:400}.tag{display:inline-flex;font-size:11px;line-height:1.5;padding:3px 7px;border-radius:3px;background:#f0f4fb;color:#45608b}.tag.green{background:#edf5f1;color:#387360}.catalog-bottom{display:flex;align-items:center;gap:30px;padding:28px 0;border-top:1px solid #e0e5eb;margin-top:45px}.catalog-bottom>div{flex:1}.catalog-bottom h3{font-size:17px}.catalog-bottom p{color:#737c86;font-size:13px;margin-top:5px}.catalog-bottom>a{color:#245ddd;font-size:13px;font-weight:650}.empty{padding:70px 0;text-align:center;color:#687381;grid-column:1/-1}.breadcrumb{display:flex;gap:8px;color:#87909b;font-size:12px;margin-bottom:25px}.detail-grid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:48px;align-items:start}.detail-photo{width:100%;aspect-ratio:1.7;object-fit:cover;border-radius:5px;display:block}.detail-copy{margin-top:30px;border-top:1px solid #e4e7eb;padding-top:30px}.detail-copy h2{margin-bottom:18px}.detail-copy p{font-size:14px;color:#65717e;line-height:1.9}.points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:24px}.points strong{display:block;font-size:14px}.points p{font-size:13px;margin-top:7px}.buy-panel{position:sticky;top:24px}.buy-panel h1{font-size:27px;margin-top:14px}.buy-panel .price{font-size:28px;padding-top:22px;margin-top:24px}.buy-panel>button,.buy-panel>a.primary{width:100%;margin-top:16px;padding:13px;display:flex;justify-content:center;border-radius:4px}.buy-panel dl{display:grid;grid-template-columns:85px 1fr;gap:10px;font-size:13px;border-top:1px solid #e4e7eb;border-bottom:1px solid #e4e7eb;padding:20px 0;margin:22px 0 0}.buy-panel dt{color:#84909d}.buy-panel dd{margin:0}.notice{font-size:12px;color:#7a8490;line-height:1.8;margin-top:17px}.curriculum{margin-top:16px}.curriculum details{border-bottom:1px solid #e4e7eb;padding:16px 0}.curriculum summary{cursor:pointer;font-weight:600;font-size:14px}.curriculum p{padding:12px 0 0 18px;font-size:13px}.progress{height:4px;background:#e9edf2;border-radius:3px;overflow:hidden;margin:18px 0 8px}.progress>span{display:block;background:#245ddd;height:100%}.library-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.library-item{display:grid;grid-template-columns:155px minmax(0,1fr);gap:22px;border-top:1px solid #e2e6ec;padding:26px 0}.library-item>img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:4px}.library-item h3{margin:8px 0;font-size:17px}.library-item a{display:inline-flex;gap:8px;color:#245ddd;font-size:13px;font-weight:650;margin-top:12px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px}.player{aspect-ratio:16/9;background:#20252b;position:relative;border-radius:5px;overflow:hidden;color:white}.player>img{width:100%;height:100%;object-fit:cover;filter:brightness(.5)}.player-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px}.player-overlay button{border:1px solid #ffffff66;color:white;background:#20252bcc}.player-overlay p{font-size:12px;color:#d8dce2}.player-label{position:absolute;top:18px;left:20px;font-size:11px}.lesson-title{margin:22px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}.lesson-title h1{font-size:23px}.lesson-title p{font-size:12px;color:#77828f;margin-bottom:5px}.lesson-panel{padding:22px 0}.lesson-panel p{font-size:14px;color:#647180;line-height:1.9}.lesson-sidebar{border-left:1px solid #e4e7ed;padding-left:24px}.lesson-sidebar h2{font-size:18px}.lesson-list{margin-top:24px}.lesson-row{display:flex;width:100%;text-align:left;justify-content:flex-start;border:0;border-radius:4px;padding:13px 10px;gap:12px;margin-bottom:5px;font-size:13px;font-weight:500;background:transparent}.lesson-row.active{background:#edf3ff;color:#245ddd}.lesson-row>span:first-child{font-size:11px;color:#788696;width:22px;flex-shrink:0}.lesson-row small{display:block;font-size:11px;margin-top:4px}.file-row{display:flex;align-items:center;justify-content:space-between;padding:18px 0;border-bottom:1px solid #e2e6ed;gap:20px}.file-row strong{display:block;font-size:14px}.file-row small{font-size:12px}.notes{width:100%;min-height:180px;resize:vertical;border:1px solid #dce1e8;border-radius:4px;padding:16px;margin-bottom:10px;font:inherit;line-height:1.8}.reader-tools{display:flex;gap:10px;align-items:center;justify-content:space-between;border-bottom:1px solid #e3e6ea;padding:0 0 18px;flex-wrap:wrap}.reader-tools>div{display:flex;gap:10px;align-items:center}.reader-tools button{padding:6px 12px}.reader{background:#f0f2f5;padding:28px;overflow:auto;margin-top:20px;max-height:75vh}.paper{position:relative;background:white;max-width:690px;margin:auto;padding:55px 50px;min-height:700px;border:1px solid #e1e5e9}.paper .page-no{font-size:11px;color:#828c97;display:flex;justify-content:space-between;margin-bottom:35px}.paper h2{font-size:27px;margin-bottom:25px}.paper p{font-size:15px;line-height:2;color:#596470;margin-bottom:24px}.paper img{width:100%;aspect-ratio:1.8;object-fit:cover;margin-bottom:25px}.watermark{border-top:1px solid #e4e7eb;padding-top:18px;font-size:10px;color:#8b949e;margin-top:40px}.page-controls{display:flex;gap:15px;align-items:center;justify-content:center;margin-top:20px}.reader-layout{max-width:900px;margin:auto}.zoomed .paper{max-width:none;width:900px}.offline-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:30px}.offline-grid img{width:100%;aspect-ratio:1.9;object-fit:cover;border-radius:4px}.offline-grid h2{margin:16px 0 8px}.offline-grid p{font-size:14px;color:#6c7683}.offline-grid a{display:inline-block;font-size:14px;color:#245ddd;margin-top:20px}footer{border-top:1px solid #e6e9ed;max-width:1200px;margin:auto;padding:24px 0;display:flex;gap:24px;font-size:12px;color:#8a939e}footer strong{color:#4d5661}footer>span:last-child{margin-left:auto}dialog{width:430px;max-width:calc(100% - 40px);border:1px solid #dce1e8;border-radius:8px;padding:24px}dialog::backdrop{background:#17202b66}.dialog-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.dialog-head button{font-size:22px;border:0;padding:0 8px}#dialogBody p{font-size:14px;color:#64707e;margin:12px 0}#dialogBody button{margin-top:12px;width:100%}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#242a32;color:white;padding:12px 20px;border-radius:5px;max-width:90%;font-size:13px;z-index:30;display:none}:focus-visible{outline:2px solid #245ddd;outline-offset:4px}
@media(max-width:800px){header{gap:18px;flex-wrap:wrap;padding:18px 20px}.brand{font-size:20px}.account{margin-left:auto}nav{order:3;width:100%;gap:24px;font-size:13px}.preview-band{padding:7px 20px}.preview-band>span{font-size:9px}main{padding:28px 20px 45px}h1{font-size:27px}.intro-line{display:block}.intro-line .link{margin-top:18px}.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:25px 16px}.product h3{font-size:17px}.catalog-tools{align-items:stretch;flex-direction:column;gap:0}.search{order:-1;border-bottom:1px solid #eef0f3}.search input{width:100%;padding:6px 0}.tabs{gap:24px}.tabs button{font-size:13px}.cover-tag{font-size:9px}.detail-grid,.lesson-layout{grid-template-columns:1fr;gap:28px}.buy-panel{position:static;grid-row:1}.buy-panel h1{font-size:27px}.detail-photo{aspect-ratio:1.6}.points{grid-template-columns:1fr;gap:18px}.library-grid{grid-template-columns:1fr;gap:0}.lesson-sidebar{border:0;border-top:1px solid #e4e7ed;padding:24px 0 0}.lesson-title{align-items:flex-start}.lesson-title h1{font-size:19px}.lesson-title button{font-size:12px;padding:7px 10px;white-space:nowrap}.player-overlay{gap:8px}.player-overlay button{padding:7px 12px;font-size:13px}.player-label{top:10px;left:12px}.catalog-bottom{gap:20px}.catalog-bottom>i{display:none}.catalog-bottom>a{white-space:nowrap}.reader{padding:12px}.paper{padding:26px 22px;min-height:600px}.paper h2{font-size:22px}.reader-tools h1{font-size:19px}.paper p{font-size:14px}.offline-grid{grid-template-columns:1fr}footer{margin:0 20px;flex-wrap:wrap;gap:12px}footer>span:last-child{margin-left:0;width:100%}.file-row{gap:12px}.file-row button{font-size:12px;padding:8px 10px}.product .desc{min-height:0}.product .meta{gap:4px 8px}.price{font-size:18px;flex-wrap:wrap}}
@media(max-width:480px){.grid{grid-template-columns:1fr}.cover{aspect-ratio:1.8}.product .desc{min-height:0}.product .price{margin-top:12px}.library-item{grid-template-columns:100px minmax(0,1fr);gap:16px}.library-item h3{font-size:16px}.library-item>img{aspect-ratio:.8}.cover .cover-tag{top:12px;left:12px}.preview-band{font-size:9px;gap:8px}.reader-tools>div{flex-wrap:wrap}nav{justify-content:space-between;gap:12px}}