@font-face{font-family:Jakarta;src:url('/static/assets/library-v2/plus-jakarta-sans.ttf') format('truetype');font-weight:200 800;font-display:swap}
:root{--blue:#2357df;--blue-dark:#1642b8;--ink:#1b2943;--muted:#59677d;--canvas:#f5f7fb;--surface:#fff;--line:#e3e8f1;--soft-blue:#eaf0ff;--orange:#bd5416;--green:#157050;--sidebar:232px;--radius:18px;--plyr-color-main:var(--blue);--ease:cubic-bezier(.2,.8,.2,1)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--canvas);color:var(--ink);font-family:Jakarta,system-ui,sans-serif;font-size:15px;line-height:1.6}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.48}a{color:inherit;text-decoration:none}button{color:inherit}img{max-width:100%;height:auto}button,a,input{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--blue);outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{text-wrap:balance}button{border:0;background:none}svg.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;vertical-align:middle}.icon-defs{position:absolute;width:0;height:0;overflow:hidden}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;clip:rect(0,0,0,0);overflow:hidden;white-space:nowrap}.skip{position:fixed;top:10px;left:250px;transform:translateY(-150%);z-index:1200;background:var(--blue);color:white;padding:12px 20px;border-radius:10px}.skip:focus{transform:none}
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6px);background:repeating-linear-gradient(90deg,#ddd 0 1px,#fff 1px 3px);transform:rotateY(90deg);transform-origin:left}.cover-fallback{padding:15px;background:#234783;color:white;display:flex;flex-direction:column;justify-content:space-between;min-width:0;width:100%;height:100%}.cover-fallback small{font-size:8px;letter-spacing:.7px}.cover-fallback>span{font-size:12px;font-weight:700}.book-meta{padding:21px 20px 20px;min-width:0}.solution-badge{display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-size:10px;font-weight:600;margin-bottom:10px}.solution-badge .icon{width:13px;height:13px}.solution-badge.available{color:var(--green)}.book-title{font-size:15px;line-height:1.55;letter-spacing:-.35px;font-weight:700;text-wrap:pretty;overflow-wrap:anywhere}.book-subject{font-size:11px;color:var(--muted);margin-top:5px}.book-counts{display:flex;align-items:center;flex-wrap:wrap;gap:8px 14px;font-size:10px;color:var(--muted);margin-top:15px}.book-counts>span{display:flex;align-items:center;gap:5px}.book-counts .icon{width:13px;height:13px}.book-progress-label{display:flex;justify-content:space-between;font-size:9px;color:var(--muted);margin:18px 0 6px}.book-progress-label b{color:var(--blue);font-weight:600}.cover-progress{background:#edf1f8;border-radius:10px;height:4px;overflow:hidden}.cover-progress i{display:block;height:100%;background:var(--blue);border-radius:10px}.book-action{display:flex;align-items:center;justify-content:space-between;color:var(--blue);background:var(--soft-blue);width:100%;font-size:12px;font-weight:650;min-height:44px;border-radius:8px;padding:10px 14px;margin-top:20px;transition:color .2s,background .2s}.book-action:hover{color:white;background:var(--blue)}.book-action .icon{width:16px;height:16px}.shelf-grid.single{grid-template-columns:1fr}.single .book-card{display:grid;grid-template-columns:248px 1fr;max-width:none}.single .book-stage{height:100%;min-height:280px}.single .book-open{width:154px;height:212px}.single .book-meta{padding:27px 32px}.single .book-title{font-size:20px;line-height:1.45;max-width:650px}.single .book-counts{font-size:11px}.single .book-action{max-width:220px}.single .book-progress-label,.single .cover-progress{max-width:560px}.empty{grid-column:1/-1;display:flex;flex-direction:column;gap:14px;align-items:center;justify-content:center;min-height:180px;padding:24px;color:var(--muted);font-size:13px;text-align:center;background:white;border:1px dashed #c9d3e4;border-radius:16px}.empty button{min-height:44px;padding:10px 20px;color:var(--blue);background:var(--soft-blue);border-radius:8px;font-weight:600}.loading-dot{height:20px;width:20px;border:2px solid #cdd9f7;border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite}.continue-section{padding-top:32px;scroll-margin-top:95px}.section-hint{font-size:10px;color:var(--muted)}.continue-card{display:flex;align-items:center;gap:20px;width:100%;text-align:left;background:white;border:1px solid var(--line);padding:16px 22px;border-radius:14px;min-height:116px;transition:border-color .2s}.continue-card:hover{border-color:#b7caf5}.continue-card img{width:52px;height:75px;object-fit:cover;border-radius:3px}.continue-text{min-width:0;flex:1}.continue-text small{font-size:9px;color:var(--blue);font-weight:700;letter-spacing:.8px}.continue-text b{display:block;font-size:13px;line-height:1.6;margin:3px 0;overflow-wrap:anywhere}.continue-text>span{font-size:10px;color:var(--muted)}.continue-action{display:flex;align-items:center;gap:15px;font-size:11px;white-space:nowrap;color:var(--blue);font-weight:650}.continue-action .icon{width:18px}
.how{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:22px;border-top:1px solid var(--line);margin-top:42px;padding:30px 0;scroll-margin-top:100px}.how-intro h2{font-size:17px;letter-spacing:-.5px;line-height:1.6}.how-step{display:flex;gap:12px;align-items:center}.how-step>span{display:flex;align-items:center;justify-content:center;height:30px;width:30px;border:1px solid #ccd8ef;border-radius:8px;color:var(--blue);font-size:10px;font-weight:700;flex-shrink:0}.how-step h3{font-size:12px;font-weight:650}.how-step p{font-size:10px;color:var(--muted);margin-top:3px}.footer{margin-left:var(--sidebar);width:calc(100% - var(--sidebar));border-top:1px solid var(--line);padding-top:20px;padding-bottom:22px;color:var(--muted);font-size:10px;display:flex;align-items:center;justify-content:space-between}.mobile-nav{display:none}.back{min-height:44px;display:inline-flex;gap:10px;align-items:center;font-size:12px;font-weight:600;color:var(--muted);padding:0;margin-bottom:22px}.back .icon{width:18px}.detail-head{border:1px solid var(--line);border-radius:18px;background:white;padding:28px;display:flex;align-items:center;gap:28px;margin-bottom:25px}.detail-cover{width:90px;height:126px;object-fit:cover;border-radius:3px;box-shadow:4px 8px 12px #1b294312;transform:rotate(-3deg);flex-shrink:0}.detail-head>div{min-width:0}.detail-head h2{font-size:23px;line-height:1.45;font-weight:750;letter-spacing:-.8px;overflow-wrap:anywhere;max-width:700px}.detail-stats{display:flex;gap:12px 18px;align-items:center;flex-wrap:wrap;margin-top:14px;font-size:11px;color:var(--muted)}.detail-stats>span{display:flex;gap:5px;align-items:center}.detail-stats .icon{width:14px;height:14px}.pdf-link{font-size:11px;color:var(--blue);font-weight:650;padding:5px 10px;background:var(--soft-blue);border-radius:5px}.detail-tools{display:flex;align-items:center;gap:20px;margin-bottom:16px}.only-ready,.auto-next{display:flex;gap:9px;align-items:center;font-size:11px;min-height:44px;color:var(--muted);flex-shrink:0;cursor:pointer}input[type=checkbox]{width:17px;height:17px;accent-color:var(--blue);margin:0;cursor:pointer}.search-results{display:grid;gap:8px;margin-bottom:18px;font-size:12px;color:var(--muted)}.search-hit{min-height:48px;background:var(--soft-blue);color:var(--blue);text-align:left;padding:10px 16px;border-radius:8px;font-size:12px}.guide{font-size:11px;color:var(--muted);margin-bottom:18px}.konu{border:1px solid var(--line);border-radius:14px;background:white;margin-bottom:14px;overflow:hidden}.konu-h{width:100%;display:flex;align-items:center;gap:16px;text-align:left;min-height:88px;padding:20px 24px}.kn{height:38px;width:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:var(--soft-blue);color:var(--blue);font-size:14px;font-weight:700;flex-shrink:0}.kt{flex:1;min-width:0}.kt b{display:block;font-size:14px;font-weight:650}.kt small{display:block;color:var(--muted);font-size:10px;margin-top:5px}.kar{display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--muted);transition:transform .22s}.kar .icon{width:17px;height:17px}.konu.open>.konu-h>.kar,.test.open>.test-h>.kar{transform:rotate(90deg)}.konu-body,.test-body{display:none}.konu.open>.konu-body,.test.open>.test-body{display:block;animation:view-in .22s var(--ease)}.konu-body{padding:0 24px 20px}.test{border:1px solid var(--line);border-radius:10px;margin-top:10px;overflow:hidden}.test-h{width:100%;min-height:60px;padding:13px 16px;display:flex;align-items:center;gap:12px;background:#fafbfe;text-align:left}.test-h>span:first-child{font-size:12px;font-weight:650}.test-h small{font-size:10px;color:var(--muted);flex:1}.qlist{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:16px}.q{display:flex;align-items:center;gap:10px;text-align:left;min-height:66px;border:1px solid var(--line);border-radius:9px;padding:11px;transition:border-color .2s,background .2s}.q:hover{background:var(--soft-blue);border-color:#b8caf1}.q .no{display:flex;justify-content:center;align-items:center;flex-shrink:0;border-radius:7px;background:var(--soft-blue);color:var(--blue);font-size:12px;font-weight:700;width:30px;height:30px}.q .txt{min-width:0;flex:1}.q b{font-size:11px;font-weight:600;display:block}.q small{font-size:9px;color:var(--muted);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:3px}.q .play .icon{width:17px;height:17px;color:var(--blue)}.q.soon{background:#f8f9fc}.q.soon .no{background:#edf0f5;color:var(--muted)}.q.soon .play .icon{color:var(--muted)}
.body-modal{overflow:hidden}.vmodal{position:fixed;inset:0;background:#111b32c7;backdrop-filter:blur(7px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:24px;overflow:auto;animation:scrim-in .22s ease-out}.vplayer{width:1180px;max-width:100%;max-height:calc(100dvh - 48px);overflow:auto;background:white;border-radius:20px;box-shadow:0 30px 100px #050a203d;animation:dialog-in .32s var(--ease)}.vbar{display:flex;justify-content:space-between;align-items:center;padding:23px 28px;gap:18px;background:#f7f9fd;border-bottom:1px solid var(--line)}.vbar>div{min-width:0}.vbar .eyebrow{color:var(--blue);font-size:9px;margin-bottom:6px}.vbar h2{font-size:17px;font-weight:700;letter-spacing:-.4px;line-height:1.5}.vbar p{font-size:10px;color:var(--muted);margin-top:3px;overflow-wrap:anywhere}.vx{height:44px;width:44px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;background:white;flex-shrink:0;transition:background .2s}.vx:hover{background:var(--soft-blue)}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px;padding:24px}.video-column{min-width:0}.vscreen{position:relative;background:#111a2d;aspect-ratio:16/9;border-radius:12px;overflow:hidden}#vplyrKap{width:100%;height:100%}#vplyrKap video{width:100%;height:100%}#vplyrKap>.plyr{width:100%;height:100%}.plyr__video-wrapper{height:100%}.plyr__video-embed{height:100%;padding-bottom:0}.vsoon,.video-error{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:white;padding:24px;background:#111a2d}.pending-symbol{margin-bottom:12px;background:#ffffff15;padding:12px;border-radius:14px}.pending-symbol .icon{width:30px;height:30px}.vsoon h3{font-size:18px}.vsoon p,.video-error p{font-size:12px;color:#c6d2e8;margin:8px 0 18px;max-width:400px}.video-error button{background:var(--blue);color:white;border-radius:8px;padding:10px 16px;min-height:44px}.vnav{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:16px 0}.vbtn{display:flex;align-items:center;gap:8px;min-height:44px;padding:9px 14px;font-size:11px;font-weight:600;border:1px solid var(--line);border-radius:8px;background:white;transition:background .2s}.vbtn:hover:not(:disabled){background:var(--soft-blue);color:var(--blue)}.vbtn .icon{width:16px;height:16px}#vcount{font-size:11px;white-space:nowrap;color:var(--muted)}.vstrip{display:flex;gap:7px;overflow-x:auto;overscroll-behavior-x:contain;padding:4px 0 10px;scrollbar-width:thin}.vchip{height:44px;min-width:44px;border:1px solid var(--line);background:white;border-radius:8px;color:var(--muted);font-size:12px;font-weight:600;flex-shrink:0}.vchip.on{color:white;background:var(--blue);border-color:var(--blue)}.vchip.soon{border-style:dashed}.auto-next{margin-top:8px;font-size:10px}.question-column{min-width:0}#questionDetails{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:white}.question-open{width:100%;min-height:52px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;color:var(--blue);font-size:12px;font-weight:700;background:var(--soft-blue);transition:background .2s}.question-open:hover{background:#dde7fe}.question-open>span{display:flex;align-items:center;gap:10px}.question-open .icon{width:17px;height:17px}.question-thumbnail{width:100%;display:block;background:white;padding:18px;min-height:120px;cursor:zoom-in}.question-thumbnail img{display:block;width:100%;height:220px;object-fit:contain}.question-thumbnail:hover{background:#fafbfe}.question-caption{display:block;font-size:9px;color:var(--muted);text-align:center;padding:0 10px 15px}#questionImageError{padding:20px;font-size:11px;color:var(--muted)}.study-tip{margin-top:20px;background:#f7f9fd;padding:18px;border-radius:12px}.study-tip .note-icon{float:left;width:30px;height:30px;margin:0 10px 0 0}.study-tip .icon{width:16px;height:16px}.study-tip b{font-size:12px;line-height:30px;font-weight:700}.study-tip p{clear:both;color:var(--muted);font-size:10px;line-height:1.85;margin-top:10px}
.question-popup{border:1px solid #d9e1ef;padding:0;border-radius:20px;width:min(1100px,calc(100vw - 64px));height:min(900px,calc(100dvh - 64px));max-width:none;max-height:none;overflow:hidden;background:white;color:var(--ink);box-shadow:0 35px 120px #00000045}.question-popup[open]{animation:dialog-in .28s var(--ease)}.question-popup::backdrop{background:#101c39a8;backdrop-filter:blur(6px);animation:scrim-in .22s ease-out}.question-popup.closing{animation:dialog-out .17s ease-in both}.question-popup.closing::backdrop{animation:scrim-out .17s ease-in both}.question-popup-panel{height:100%;display:grid;grid-template-rows:auto auto minmax(0,1fr) auto}.question-popup-header{padding:22px 28px 18px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line)}.question-popup-header>div{min-width:0}.question-popup-header .eyebrow{font-size:9px;margin-bottom:4px;color:var(--blue)}.question-popup-header h2{font-size:17px;line-height:1.55;letter-spacing:-.4px;overflow-wrap:anywhere}.icon-button{width:44px;height:44px;border-radius:9px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;flex-shrink:0;background:white;transition:background .18s,color .18s}.icon-button:hover:not(:disabled){background:var(--soft-blue);color:var(--blue)}.question-zoom-toolbar{display:flex;justify-content:space-between;align-items:center;padding:10px 28px;gap:14px}.question-zoom-toolbar p{font-size:11px;color:var(--muted)}.zoom-controls{display:flex;align-items:center;gap:6px;flex-shrink:0}.zoom-controls>span{width:48px;text-align:center;font-size:11px;font-weight:600;user-select:none}.zoom-controls .icon-button{width:44px;height:44px}.zoom-controls .icon{width:17px;height:17px}.fit-button{font-size:11px;font-weight:600;min-height:44px;padding:8px 13px;color:var(--blue);border-radius:8px;background:var(--soft-blue);margin-left:4px}.question-popup-stage{overflow:auto;overscroll-behavior:contain;display:flex;min-height:0;background:#eff2f7;padding:24px;scrollbar-width:thin}.question-popup-stage.zoomed{cursor:grab}.question-popup-stage.dragging{cursor:grabbing;user-select:none}.question-popup-canvas{margin:auto;flex-shrink:0;border-radius:3px;box-shadow:0 5px 24px #152b5412;background:white}.question-popup-canvas img{display:block;max-width:none;height:auto;user-select:none}#questionPopupError{margin:auto;color:var(--muted);font-size:12px;text-align:center}.question-popup-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 28px;border-top:1px solid var(--line);background:white}.question-popup-footer>span{font-size:10px;color:var(--muted)}kbd{font:inherit;background:var(--canvas);border:1px solid var(--line);padding:2px 5px;border-radius:4px;margin-right:4px}.question-popup-footer .primary{font-size:11px;flex-shrink:0}
@keyframes hero-float{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-7px) rotate(1deg)}}@keyframes view-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}@keyframes dialog-in{from{opacity:0;transform:translateY(18px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes dialog-out{from{opacity:1;transform:translateY(0) scale(1)}to{opacity:0;transform:translateY(8px) scale(.985)}}@keyframes scrim-in{from{opacity:0}to{opacity:1}}@keyframes scrim-out{to{opacity:0}}@keyframes spin{to{transform:rotate(360deg)}}
@media(min-width:1700px){.hero{min-height:340px}.hero-copy{padding-top:38px}.hero h2{font-size:42px}.hero p{font-size:14px}.hero-art{width:102%}.hero-tag{font-size:10px}.hero-copy .primary{font-size:13px}.book-card .book-stage{height:285px}.book-open{width:154px;height:212px}}
@media(max-width:1200px){:root{--sidebar:210px}.sidebar{padding:26px 14px 18px}.shell{padding:0 28px}.hero-copy{padding-left:26px}.hero h2{font-size:31px}.hero-scene .hero-art{width:118%}.hero{min-height:290px}.shelf-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat-item{padding:14px 16px;gap:10px}.stat-item strong{font-size:21px}.exam-stat strong{font-size:11px}.stat-item div>span{font-size:9px}.workspace-badge{display:none}.how{grid-template-columns:1fr 1fr 1fr}.how-intro{grid-column:1/-1}.single .book-card{grid-template-columns:215px 1fr}.single .book-meta{padding:25px}.single .book-title{font-size:17px}.study-layout{grid-template-columns:minmax(0,1fr) 235px;gap:18px;padding:20px}.qlist{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:960px){:root{--sidebar:0px}.sidebar{display:none}.top{height:66px}.workspace{padding-top:26px}.shell{padding:0 30px}.hero{grid-template-columns:1fr 1fr}.hero h2{font-size:34px}.hero-copy{padding:30px}.hero-stats{grid-template-columns:1fr 1fr 1.2fr}.exam-stat strong{font-size:12px}.footer{padding-bottom:100px}.mobile-nav{display:flex;position:fixed;inset:auto 0 0;z-index:30;align-items:center;justify-content:center;gap:24px;padding:8px 20px calc(8px + env(safe-area-inset-bottom));background:#fffffff5;backdrop-filter:blur(15px);border-top:1px solid var(--line);box-shadow:0 -4px 20px #12234503}.mobile-nav button{display:flex;flex-direction:column;gap:4px;align-items:center;justify-content:center;min-width:100px;min-height:48px;color:var(--muted);font-size:9px;font-weight:600;border-radius:9px;padding:5px 10px}.mobile-nav .selected{background:var(--soft-blue);color:var(--blue)}.mobile-nav .icon{width:20px;height:20px}.skip{left:16px}.study-layout{grid-template-columns:minmax(0,1fr) 235px}.vbar{padding:20px}.vmodal{padding:16px}.vplayer{max-height:calc(100dvh - 32px)}}
@media(max-width:720px){.shell{padding:0 20px}.top{height:62px}.breadcrumb{font-size:11px;gap:9px}.breadcrumb-divider,.breadcrumb b{display:none}.breadcrumb>.icon{height:19px;width:19px}.help-link span{display:none}.help-link{width:44px;justify-content:center}.workspace{padding-top:24px}.workspace-heading{margin-bottom:20px}.workspace-heading h1{font-size:25px}.workspace-heading .eyebrow{font-size:9px}.workspace-heading p{font-size:11px;max-width:270px}.hero{grid-template-columns:1fr;min-height:0}.hero-copy{padding:26px 24px 0}.hero h2{font-size:33px;letter-spacing:-1.3px}.hero p{font-size:12px;margin:12px 0 16px}.hero-tag{font-size:9px;margin-bottom:14px}.hero-scene{height:225px;justify-content:flex-end}.hero-art{width:340px!important;right:-12px;max-width:none;position:absolute;bottom:-18px}.scene-caption{bottom:19px;right:20px;font-size:9px}.hero-stats{grid-template-columns:1fr 1fr;margin-top:12px;min-height:72px}.stat-item{padding:14px 16px;gap:10px}.stat-item strong{font-size:22px}.stat-item div>span{font-size:9px}.stat-icon{height:34px;width:34px;border-radius:9px}.stat-item+.stat-item:before{top:19px;height:28px}.exam-stat{grid-column:1/-1;border-top:1px solid var(--line);min-height:48px;padding:9px 16px;gap:10px}.exam-stat:before{display:none}.exam-stat>.stat-icon{width:26px;height:26px;border-radius:7px}.exam-stat .icon{width:15px;height:15px}.exam-stat>div{display:flex;align-items:center;justify-content:space-between;gap:15px;flex:1}.exam-stat strong{font-size:11px;letter-spacing:0}.exam-stat div>span{font-size:9px}.section-top h2{font-size:20px}.section-top p{font-size:11px;max-width:245px}.toolbar{gap:8px}.search{padding:0 12px;gap:8px}.search input{font-size:12px}.saved-filter{font-size:0;width:48px;padding:10px;flex-shrink:0}.saved-filter .icon{width:20px;height:20px}.chips{gap:7px;margin-bottom:18px}.chip{padding:8px 11px;font-size:11px;gap:7px;min-height:44px}.shelf-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.book-stage{height:207px;padding-top:25px}.book-open{width:110px;height:154px}.book-category{font-size:8px;left:10px;top:12px;padding:3px 6px}.save-book{height:44px;width:44px;top:4px;right:4px;background:transparent;border:0}.save-book .icon{width:17px;height:17px}.book-meta{padding:15px 13px}.book-title{font-size:12px;letter-spacing:0;line-height:1.65}.solution-badge{font-size:8px;gap:3px;margin-bottom:7px}.solution-badge .icon{width:11px;height:11px}.book-counts{font-size:9px;gap:5px;margin-top:10px}.book-counts span{width:100%}.book-progress-label{font-size:8px;margin-top:12px}.book-action{font-size:10px;padding:9px 10px;gap:5px;margin-top:15px}.single .book-card{grid-template-columns:1fr}.single .book-stage{height:265px;min-height:0}.single .book-open{height:204px;width:148px}.single .book-category{left:18px;top:18px;font-size:10px}.single .save-book{right:10px;top:9px;background:white;border:1px solid var(--line)}.single .book-meta{padding:21px 22px}.single .book-title{font-size:17px;line-height:1.6}.single .solution-badge{font-size:10px}.single .book-counts{font-size:11px;gap:9px 16px}.single .book-counts span{width:auto}.single .book-action{max-width:none;font-size:12px}.single .book-progress-label{font-size:10px}.library,.continue-section{padding-top:27px}.how{gap:22px 18px;grid-template-columns:1fr;border-top:1px solid var(--line);margin-top:30px;padding-top:25px}.how-intro{grid-column:1}.how-intro h2{font-size:17px}.how-step>span{width:32px;height:32px}.how-step h3{font-size:12px}.how-step p{font-size:11px}.footer{flex-direction:column;gap:6px;align-items:flex-start;font-size:9px;padding-top:18px}.mobile-nav{gap:9px;padding-left:8px;padding-right:8px}.mobile-nav button{flex:1;min-width:0;max-width:150px;font-size:9px}.continue-card{padding:15px;gap:12px;align-items:flex-start}.continue-text b{font-size:11px}.continue-card img{width:42px;height:60px}.continue-action{font-size:0;gap:0;margin-top:20px}.continue-action .icon{width:20px;font-size:12px}.section-hint{font-size:9px;max-width:100px;text-align:right}.detail-head{padding:20px;gap:18px;align-items:flex-start}.detail-cover{width:62px;height:88px}.detail-head h2{font-size:16px;letter-spacing:-.4px}.detail-head .eyebrow{font-size:8px;letter-spacing:1px}.detail-stats{font-size:10px;gap:8px;margin-top:10px}.detail-tools{flex-wrap:wrap;gap:8px}.detail-tools .search{flex-basis:100%}.only-ready{font-size:11px}.konu-h{padding:17px 16px;gap:12px;min-height:84px}.kn{width:32px;height:32px;font-size:12px;border-radius:8px}.kt b{font-size:12px}.kt small{font-size:9px}.konu-body{padding:0 12px 12px}.test-h{padding:12px;gap:8px}.test-h small{font-size:9px}.qlist{grid-template-columns:1fr;padding:12px;gap:8px}.q{min-height:66px}.q b{font-size:12px}.q small{font-size:10px}.guide{font-size:10px}.vmodal{padding:8px;align-items:center}.vplayer{border-radius:15px;max-height:calc(100dvh - 16px)}.vbar{padding:18px;gap:10px}.vbar h2{font-size:14px}.vbar p{font-size:9px}.vbar .eyebrow{font-size:8px}.vx{border-radius:8px}.study-layout{grid-template-columns:1fr;padding:16px;gap:18px}.vscreen{border-radius:8px}.vnav{gap:8px;margin:12px 0}.vbtn{font-size:10px;padding:8px 10px;gap:5px}.vbtn .icon{width:14px;height:14px}.vchip{font-size:11px}.question-column{grid-row:1}.question-thumbnail,.question-caption,.study-tip{display:none}.question-open{min-height:48px;font-size:12px;padding:10px 14px}.auto-next{font-size:10px}.vsoon h3{font-size:14px}.vsoon p{font-size:10px;margin:6px 0 12px}.pending-symbol{padding:8px;margin-bottom:6px}.pending-symbol .icon{width:20px;height:20px}.vsoon .primary{font-size:10px;padding:8px 12px;gap:6px}.question-popup{width:calc(100vw - 16px);height:calc(100dvh - 24px);border-radius:16px}.question-popup-header{padding:17px 16px;gap:10px}.question-popup-header h2{font-size:13px}.question-popup-header .eyebrow{font-size:8px}.question-zoom-toolbar{padding:9px 13px;justify-content:center}.question-zoom-toolbar p{display:none}.question-popup-stage{padding:16px}.question-popup-footer{padding:12px 14px;gap:8px}.question-popup-footer>span{font-size:8px;max-width:160px}.question-popup-footer .primary{font-size:10px;padding:8px 12px;gap:7px}.question-popup-header .icon-button{width:44px;height:44px}}
@media(max-width:360px){.shell{padding:0 14px}.hero-copy{padding:24px 20px 0}.hero h2{font-size:30px}.hero-art{width:310px!important}.exam-stat>div{gap:8px}.exam-stat strong{font-size:10px}.exam-stat div>span{font-size:8px}.stat-item{padding:12px}.single .book-meta{padding:18px}.vbtn{font-size:9px;padding:8px}.vbar{padding:15px}.question-popup-footer>span{display:none}.question-popup-footer{justify-content:flex-end}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.hero-art{transform:none}.book-open{transform:rotateY(-9deg)}}

#shareQuestion[hidden]{display:none}
#shareQuestion{white-space:nowrap}
@media(max-width:720px){.vnav{flex-wrap:wrap}.vnav #shareQuestion{margin-left:auto}}

/* Larger solution window; retain touch controls and the question sidebar. */
.vmodal{padding:12px}
.vplayer{width:min(1600px,calc(100vw - 24px));max-height:calc(100dvh - 24px);overscroll-behavior:contain;scroll-padding-top:110px}
.vbar{position:sticky;top:0;z-index:3;padding:16px 20px}
.study-layout{grid-template-columns:minmax(0,1fr) 240px;gap:18px;padding:16px}
#vplyrKap video{object-fit:contain}
@media(min-width:721px) and (max-width:960px){.study-layout{grid-template-columns:minmax(0,1fr) 200px;gap:14px;padding:14px}}
@media(max-width:720px){
 .vmodal{padding:0}
 .vplayer{width:100%;max-height:100dvh;border-radius:0;scroll-padding-top:100px}
 .vbar{padding:calc(12px + env(safe-area-inset-top,0px)) max(12px,env(safe-area-inset-right,0px)) 12px max(12px,env(safe-area-inset-left,0px))}
 .study-layout{grid-template-columns:minmax(0,1fr);padding:12px 0 calc(12px + env(safe-area-inset-bottom,0px));gap:12px}
 .vscreen{border-radius:0}
 .question-column{margin:0 12px}
 .vnav{margin:12px max(12px,env(safe-area-inset-right,0px)) 12px max(12px,env(safe-area-inset-left,0px))}
 .vstrip{margin:0 12px}
 .auto-next{margin:8px 12px 0}
}