/* Art belongs to the frame. No selectors recolour or move mathematical SVG content. */
.art-polished{--art-wash:#edf3e6;--art-pencil:#b5c6a6;--art-sticker:#f5edd0}
.art-polished[data-art-theme=apricot]{--art-wash:#fbede2;--art-pencil:#d3b9a2;--art-sticker:#fff0d8}
.art-polished[data-art-theme=lilac]{--art-wash:#f0eaf7;--art-pencil:#c3b6d3;--art-sticker:#eee6f6}
.art-polished[data-art-theme=sky]{--art-wash:#eaf2f5;--art-pencil:#b4cad0;--art-sticker:#e4efee}
.art-polished[data-art-theme=rose]{--art-wash:#f8edf0;--art-pencil:#d5bcc7;--art-sticker:#f7e5e9}
.art-polished #lessonScreen .board{box-shadow:0 3px #e9dfcc,0 0 0 3px #fffdf4}
.art-polished #lessonScreen .board-head{background-color:#fffdf6;background-image:linear-gradient(110deg,var(--art-wash),#fffdf6 65%);border-bottom-color:var(--art-pencil)}
.art-polished .board-head #stageLabel{color:#816b4d;vertical-align:middle}
.art-polished .board-head #stageLabel:before{display:none}
.art-topic-sticker{display:inline-flex;width:28px;height:28px;align-items:center;justify-content:center;vertical-align:middle;margin:0 7px 2px 0;padding:3px;border:1px solid #cfbea366;border-radius:9px 7px 10px 7px;background:var(--art-sticker);box-shadow:1px 2px 0 #d1c3ad33;pointer-events:none;user-select:none}
.art-topic-sticker>.art-topic-icon{display:block;width:100%;height:100%;max-width:none;flex:none;color:#756978}
.art-polished .board-head h2{font-family:"Yuanti SC","PingFang SC","Microsoft YaHei",sans-serif;font-weight:650}
.art-polished #lessonScreen #steps button.active{border-radius:10px 8px 11px 8px;box-shadow:inset 3px 0 #d8b36855}
.art-polished #lessonScreen #explanation:not(.success){color:#65634e;background-image:linear-gradient(100deg,#f2f2df,#f7f6e9)}
.art-polished #lessonScreen .transport #play{border-radius:10px 8px 10px 8px}
@container mathapp (max-height:520px){
 .art-topic-sticker{width:14px;height:14px;padding:0;margin:0 5px 0 0;border-radius:6px 5px 7px 5px;box-shadow:1px 1px 0 #d1c3ad33}
 .art-polished #lessonScreen .board{box-shadow:0 2px #e9dfcc,0 0 0 1px #fffdf4}
}
@media(prefers-reduced-motion:reduce){.art-topic-sticker,.art-topic-sticker *{animation:none!important;transition:none!important}}