/* Three stationery types follow the source series, across subjects and languages. */
.ac-simple[data-note-series="main"],.ac-simple [data-note-series="main"]{--series-paper:url('/assets/ai-learning/series-papers-v1/main-v2.webp');--series-edge:#f6cc68;--series-badge:#fff0b6}
.ac-simple[data-note-series="module"],.ac-simple [data-note-series="module"]{--series-paper:url('/assets/ai-learning/series-papers-v1/module.webp');--series-edge:#b9dfcc;--series-badge:#e1f5e8}
.ac-simple[data-note-series="focus"],.ac-simple [data-note-series="focus"]{--series-paper:url('/assets/ai-learning/cute-v1/bear-note-v3.webp');--series-edge:#d6c2e6;--series-badge:#eee1fa}
.ac-simple .ac-organized-topics,.ac-simple .ac-question-grid{align-items:start}
.ac-simple .ac-paper-legend{display:flex;flex-wrap:wrap;gap:8px 18px;margin:12px 6px 18px;color:#4b3021;font-size:14px}
.ac-simple .ac-paper-legend>span{display:inline-flex;align-items:center;gap:9px;min-height:58px}
.ac-simple .ac-mini-book{display:inline-grid;place-items:center;flex:none;width:56px;height:62px;perspective:360px;vertical-align:middle}
.ac-simple .ac-book-sprite{display:block;width:100%;height:100%;object-fit:contain;transform-origin:30% 80%;transform:rotate(-5deg);filter:drop-shadow(0 3px 2px #52322322);pointer-events:none}
.ac-simple .ac-paper-legend>span:hover .ac-book-sprite,.ac-simple :is(.ac-topic-open,.ail-sticker-open):is(:hover,:focus-visible) .ac-book-sprite,.ac-simple .ac-reading-book:is(:hover,:focus-visible) .ac-book-sprite{animation:ac-mini-book-hop .65s ease both}
.ac-simple :is(.ac-topic-open,.ail-sticker-open,.ac-paper-legend>span):active .ac-book-sprite{animation:none;transform:translateY(3px) rotate(5deg) scale(.93)}
.ac-simple .ac-label-node[data-note-series],.ac-simple .ail-sticker[data-note-series]{padding:164px 30px 84px}
.ac-simple .ac-topic-open,.ac-simple .ail-sticker-open{position:static}
.ac-simple .ac-label-node[data-note-series]::before,.ac-simple .ail-sticker[data-note-series]::before,.ac-simple[data-note-series] .ac-reading::before{
 border:80px solid var(--series-edge);
 border-image:var(--series-paper) 288 fill / 80px / 0 stretch;
 background:#fffaf0;background-clip:padding-box;
}
.ac-simple [data-note-series] .ac-paper-series{
 position:absolute;left:0;top:-26px;z-index:2;display:block;width:150px;max-width:none;
 margin:0;padding:0;border:0;border-radius:0;
 background:none;color:#4b3021;font:800 18px/1.4 "Noto Sans SC",sans-serif;white-space:normal;
}
.ac-simple .ac-paper-series .ac-mini-book{width:150px;height:164px}
.ac-simple [data-note-series] .ac-paper-series>span:last-child{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;padding:0;border:0;background:none;font:inherit}
.ac-simple .ac-series-bundle{display:grid;gap:18px;min-width:0;position:relative;align-content:start}
.ac-simple .ac-series-bundle>.ac-shelf-tools{margin-bottom:0}
.ac-simple[data-note-series] .ac-reading{padding:74px 40px 88px}
.ac-simple .ac-reading-top{display:flex;align-items:center;gap:8px;min-width:0}
.ac-simple .ac-reading-top .ail-card-progress{flex:1;margin-right:0}
.ac-simple .ac-reading-book{position:absolute;left:-10px;top:-44px;z-index:2;display:grid;place-items:center;width:148px;height:156px;min-height:0;border:0;background:none;padding:0;cursor:pointer}
.ac-simple .ac-reading-book .ac-mini-book{width:100%;height:100%}
.ac-simple .ac-reading-book:focus-visible{outline:3px solid #775236;outline-offset:3px;border-radius:10px}
.ac-simple .ac-reading-book.is-book-flipping .ac-book-sprite{animation:ac-mini-book-turn .6s ease both}
@keyframes ac-mini-book-hop{0%,100%{transform:rotate(-5deg)}40%{transform:translateY(-7px) rotateY(-20deg) rotate(-10deg)}70%{transform:translateY(-2px) rotateY(10deg) rotate(3deg)}}
@keyframes ac-mini-book-turn{0%,100%{transform:rotate(-5deg)}45%{transform:translateY(-4px) rotateY(-38deg) rotate(-10deg)}75%{transform:rotateY(16deg) rotate(3deg)}}
@media(max-width:599px){
 .ac-simple .ac-paper-legend{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;text-align:center;font-size:13px}
 .ac-simple .ac-paper-legend>span{flex-direction:column;gap:0;min-width:0}
 .ac-simple [data-note-series] .ac-paper-series{top:-24px;width:128px}
 .ac-simple .ac-paper-series .ac-mini-book{width:128px;height:144px}
 .ac-simple .ac-label-node[data-note-series],.ac-simple .ail-sticker[data-note-series]{padding:148px 28px 82px}
 .ac-simple[data-note-series] .ac-reading{padding:72px 27px 86px}
 .ac-simple .ac-reading-book{left:-6px;top:-32px;width:112px;height:124px}
}
@media(max-width:359px){
 .ac-simple [data-note-series] .ac-paper-series{top:-20px;width:112px}
 .ac-simple .ac-paper-series .ac-mini-book{width:112px;height:128px}
 .ac-simple .ac-label-node[data-note-series],.ac-simple .ail-sticker[data-note-series]{padding-top:132px}
 .ac-simple .ac-reading-book{top:-26px;width:96px;height:108px}
}
@media(prefers-reduced-motion:reduce){.ac-simple .ac-book-sprite{animation:none!important;transform:none!important}}