.product-demo{--demo-ink:#172b3c;--demo-muted:#576779;--demo-blue:#2f7cf6;--demo-line:#dfe5ed;--demo-paper:#f6f8fb;color:var(--demo-ink);border:1px solid var(--demo-line);isolation:isolate;text-align:left;background:#fff;border-radius:16px;min-width:0;font-family:Figtree,ui-sans-serif,system-ui,sans-serif;overflow:hidden}.product-demo *,.product-demo :before,.product-demo :after{box-sizing:border-box}.safari-frame-bar{color:#66666d;background:linear-gradient(#f7f7f8,#ededf0);border-bottom:1px solid #d9d9df;grid-template-columns:minmax(0,1fr) minmax(180px,1.75fr) minmax(0,1fr);align-items:center;gap:18px;height:48px;padding:0 15px;font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,Arial,sans-serif;display:grid}.safari-frame-leading{align-items:center;gap:12px;display:flex}.safari-traffic-lights{align-items:center;gap:6px;padding-right:4px;display:flex}.safari-traffic-lights i{background:#ff5f57;border:1px solid #0000000d;border-radius:50%;width:10px;height:10px}.safari-traffic-lights i:nth-child(2){background:#febc2e}.safari-traffic-lights i:nth-child(3){background:#28c840}.safari-navigation-controls{gap:9px;display:flex}.safari-navigation-controls svg:last-child{color:#babac0}.safari-address-field{background:#ffffffb8;border:1px solid #d9d9df;border-radius:7px;grid-template-columns:16px minmax(0,1fr) 12px;align-items:center;gap:5px;min-width:0;height:29px;padding:0 8px;display:grid;box-shadow:inset 0 1px 2px #00000003}.safari-reader-control{letter-spacing:-.04em;font-size:10px}.safari-address{color:#55555c;white-space:nowrap;justify-content:center;align-items:center;gap:5px;font-size:11px;display:flex;overflow:hidden}.safari-address span{text-overflow:ellipsis;overflow:hidden}.safari-address svg{color:#77777e;flex-shrink:0}.safari-frame-trailing{justify-content:flex-end;align-items:center;gap:12px;display:flex}.study-loop-editorial{max-width:40ch;margin-top:28px}.study-loop-editorial>p{color:var(--color-muted);font-size:15px;line-height:1.85}.study-loop-editorial strong{color:var(--color-fg);margin-bottom:4px;font-size:16px;font-weight:600;display:block}.study-loop-start-link{min-height:44px;color:var(--color-fg);align-items:center;gap:10px;margin-top:18px;font-size:14px;font-weight:600;display:inline-flex}.study-loop-start-link>svg{color:var(--color-primary)}.study-loop-start-link:hover{text-underline-offset:4px;text-decoration:underline}.study-loop-start-link:focus-visible{outline:2px solid var(--color-primary);outline-offset:5px;border-radius:4px}.product-demo button{cursor:pointer}.product-demo button:focus-visible{outline:2px solid var(--demo-blue);outline-offset:-3px}.product-playback{border-top:1px solid var(--demo-line);background:#fff;justify-content:space-between;align-items:center;gap:8px;min-height:66px;padding:8px 10px 11px;display:flex;position:relative}.product-chapters{flex:1;align-items:center;gap:2px;min-width:0;display:flex}.product-chapters button{min-height:44px;color:var(--demo-muted);white-space:nowrap;border-radius:8px;justify-content:center;align-items:center;gap:7px;padding:8px 10px;font-size:12px;font-weight:600;transition:color .18s,background .18s;display:inline-flex}.product-chapters button:hover{background:var(--demo-paper);color:var(--demo-ink)}.product-chapters button[aria-pressed=true]{color:#215fbc;background:#eaf2ff}.product-playback-actions{align-items:center;display:flex}.product-playback-actions button{width:44px;height:44px;color:var(--demo-muted);border-radius:8px;place-items:center;display:grid}.product-playback-actions button:hover{background:var(--demo-paper);color:var(--demo-ink)}.product-playback-actions button:disabled{cursor:default;opacity:.45}.product-playback-track{background:#edf1f6;height:3px;position:absolute;bottom:0;left:0;right:0;overflow:hidden}.product-playback-track i{background:var(--demo-blue);transform-origin:0;width:100%;height:100%;display:block;transform:scaleX(0)}.product-cursor{z-index:9;pointer-events:none;opacity:0;width:18px;height:22px;position:absolute;top:0;left:0}.product-cursor-body{transform-origin:2px 2px;filter:drop-shadow(0 1px 1px #172b3c30);display:block}.product-cursor-pulse{border:1px solid var(--demo-blue);opacity:0;background:#2f7cf618;border-radius:50%;width:20px;height:20px;position:absolute;top:-9px;left:-9px}.product-demo[data-running=true] .product-cursor{will-change:transform}.product-demo[data-static=true] .product-cursor{display:none}.product-answer-letter{color:#43576b;border:1px solid #cbd5e1;border-radius:50%;flex-shrink:0;place-items:center;width:25px;height:25px;font-size:11px;font-weight:600;display:grid}.product-faux-button{background:var(--demo-blue);color:#fff;white-space:nowrap;border-radius:8px;justify-content:center;align-items:center;gap:8px;min-height:36px;padding:8px 14px;font-size:12px;font-weight:600;display:inline-flex}.product-faux-secondary{border:1px solid var(--demo-line);min-height:36px;color:var(--demo-ink);white-space:nowrap;background:#fff;border-radius:8px;justify-content:center;align-items:center;gap:7px;padding:8px 12px;font-size:12px;font-weight:600;display:inline-flex}.product-question-actions{align-items:center;gap:8px;display:flex}.product-question-count{color:var(--demo-muted);white-space:nowrap;margin-left:auto;font-size:11px}.product-question-label{color:var(--demo-muted);justify-content:space-between;align-items:center;gap:8px;font-size:11px;display:flex}.product-question-label>span:first-child{background:var(--demo-ink);color:#fff;border-radius:6px;place-items:center;width:24px;height:24px;font-weight:600;display:grid}.product-question-label>span:last-child{align-items:center;gap:6px;display:inline-flex}.study-app-stage{background:var(--demo-paper);grid-template-columns:48px minmax(0,1fr);height:490px;display:grid;position:relative}.product-mini-rail{color:#cde5f4;background:#226087;flex-direction:column;align-items:center;gap:23px;padding:17px 0;display:flex}.product-mini-brand{color:#fff;background:#ffffff20;border-radius:8px;place-items:center;width:27px;height:27px;margin-bottom:7px;font-size:17px;font-weight:700;display:grid}.product-mini-active{color:#fff;background:#ffffff20;border-radius:8px;place-items:center;width:32px;height:32px;display:grid}.product-mini-avatar{margin-top:auto}.study-views{min-width:0;position:relative;overflow:hidden}.study-scene{pointer-events:none;animation-duration:var(--demo-duration);animation-timing-function:linear;animation-iteration-count:infinite;animation-play-state:paused;position:absolute;inset:0}.product-view-heading{border-bottom:1px solid var(--demo-line);background:#fff;justify-content:space-between;align-items:center;gap:12px;height:47px;padding:0 19px;display:flex}.product-view-heading>span:first-child{font-size:13px;font-weight:650}.product-view-detail{color:var(--demo-muted);align-items:center;gap:5px;font-size:10px;display:flex}.study-scene-practice{animation-name:study-view-practice}.study-scene-review{opacity:0;animation-name:study-view-review}.study-scene-plan{opacity:0;animation-name:study-view-plan}.study-scene-retry{opacity:0;animation-name:study-view-retry}@keyframes study-view-practice{0%,22%,to{opacity:1}25%,96%{opacity:0}}@keyframes study-view-review{0%,22%,50%,to{opacity:0}25%,47%{opacity:1}}@keyframes study-view-plan{0%,47%,75%,to{opacity:0}50%,72%{opacity:1}}@keyframes study-view-retry{0%,72%,to{opacity:0}75%,96%{opacity:1}}.study-question{border:1px solid var(--demo-line);background:#fff;border-radius:12px;margin:17px;padding:17px}.study-question h3{margin-top:13px;font-size:14px;font-weight:600;line-height:1.5}.study-equation{justify-content:center;align-items:center;gap:4px;padding:12px 0 16px;font-family:"Source Serif 4",Georgia,serif;font-size:30px;line-height:1.25;display:flex}.study-equation>span{color:#7c8997}.study-math-choices{grid-template-columns:1fr 1fr;gap:8px;display:grid}.study-math-choice{border:1px solid var(--demo-line);background:#fff;border-radius:8px;align-items:center;gap:10px;padding:9px 10px;font-size:14px;display:flex}.study-answer-check{opacity:0;margin-left:auto}.study-question .product-question-actions{margin-top:16px}.study-question-feedback{opacity:0;border-radius:8px;align-items:flex-start;gap:9px;margin-top:12px;padding:9px 10px;font-size:11px;line-height:1.5;display:flex}.study-question-feedback>span{padding-top:2px}.study-question-feedback strong,.study-question-feedback div>span{display:block}.study-question-feedback div>span{margin-top:2px}.study-feedback-wrong{color:#873644;animation:study-wrong-feedback var(--demo-duration) linear infinite paused;background:#fff0f1}.study-feedback-right{color:#216044;animation:study-right-feedback var(--demo-duration) linear infinite paused;background:#eaf7ef}.study-wrong-choice{animation:study-wrong-choice var(--demo-duration) linear infinite paused}.study-wrong-choice .study-answer-check{animation:study-wrong-feedback var(--demo-duration) linear infinite paused}.study-right-choice{animation:study-right-choice var(--demo-duration) linear infinite paused}.study-right-choice .study-answer-check{animation:study-right-feedback var(--demo-duration) linear infinite paused}@keyframes study-wrong-choice{0%,9%,to{background:#fff;border-color:#dfe5ed}10%,15%{background:#eaf2ff;border-color:#2f7cf6}16%,24%{background:#fff0f1;border-color:#e1a6ad}25%,98%{background:#fff;border-color:#dfe5ed}}@keyframes study-wrong-feedback{0%,15%,26%,to{opacity:0}16%,24%{opacity:1}}@keyframes study-right-choice{0%,83%,to{background:#fff;border-color:#dfe5ed}84%,89%{background:#eaf2ff;border-color:#2f7cf6}90%,97%{background:#eaf7ef;border-color:#80baa0}}@keyframes study-right-feedback{0%,89%,to{opacity:0}90%,97%{opacity:1}}.study-review-content,.study-plan-content{padding:25px 22px}.study-review-title{align-items:center;gap:12px;display:flex}.study-review-title span,.study-plan-title>div>span{color:var(--demo-muted);font-size:11px;font-weight:500}.study-review-title h3,.study-plan-title h3{letter-spacing:-.025em;margin-top:4px;font-size:21px;font-weight:650;line-height:1.25}.study-review-content>p{color:var(--demo-muted);margin-top:18px;font-size:13px;line-height:1.7}.study-solution{white-space:nowrap;justify-content:space-between;align-items:center;gap:7px;margin:24px 0;font-family:"Source Serif 4",Georgia,serif;font-size:17px;display:flex}.study-solution svg{color:#91a0b1;flex-shrink:0}.study-solution strong{color:#1e64bd}.study-review-rule{background:#eaf2ff;border-radius:12px;padding:17px}.study-review-rule>span{color:#2860a5;align-items:center;gap:7px;font-size:11px;font-weight:650;display:flex}.study-review-rule h4{margin-top:9px;font-size:14px;font-weight:600}.study-review-rule p{color:#426182;margin-top:5px;font-size:12px;line-height:1.65}.study-next-link{border-top:1px solid var(--demo-line);color:#2466c5;justify-content:space-between;align-items:center;margin-top:22px;padding-top:16px;font-size:12px;font-weight:650;display:flex}.study-review-content>.study-review-footer{color:var(--demo-muted);align-items:center;gap:7px;margin-top:14px;font-size:11px;display:flex}.study-plan-title{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.study-plan-title h3{font-size:18px}.study-plan-update{color:#26704c;white-space:nowrap;align-items:center;gap:4px;padding-top:3px;font-size:10px;display:flex}.study-week{grid-template-columns:repeat(7,1fr);gap:5px;margin-top:20px;display:grid}.study-week>span{color:var(--demo-muted);text-align:center;border:1px solid var(--demo-line);background:#fff;border-radius:8px;padding:9px 2px;font-size:10px}.study-week b{color:var(--demo-ink);margin-top:4px;font-size:12px;display:block}.study-week>.is-today{color:#2466c5;background:#eaf2ff;border-color:#9ec4fa}.study-plan-task{background:#fff;border:1px solid #9ec4fa;border-radius:12px;margin-top:18px;padding:17px}.study-plan-task>div{align-items:center;gap:12px;display:flex}.study-task-icon{color:#2466c5;background:#eaf2ff;border-radius:10px;flex-shrink:0;place-items:center;width:39px;height:39px;display:grid}.study-next-up{color:#2466c5;font-size:10px;font-weight:650}.study-plan-task h4{letter-spacing:-.02em;margin:3px 0;font-size:17px;font-weight:650}.study-plan-task p{color:var(--demo-muted);font-size:11px}.study-plan-reason{align-items:flex-start;gap:7px;margin-top:14px;line-height:1.65;display:flex}.study-plan-reason svg{color:#2466c5;flex-shrink:0;margin-top:1px}.study-plan-task>.product-faux-button{margin-top:15px}.study-plan-later{color:var(--demo-muted);align-items:center;gap:8px;padding:14px 2px;font-size:12px;display:flex}.study-plan-later>span:last-child{margin-left:auto;font-size:11px}.legacy-reading-demo{--demo-blue:#2f7df4}.legacy-reading-demo .taro-showcase-window{position:relative}.legacy-reading-demo .taro-showcase-progress{animation:none;transform:scaleX(0)}.legacy-reading-demo *{animation-play-state:paused}.legacy-preview-pause{width:44px;height:44px;color:var(--color-muted);cursor:pointer;border-radius:8px;place-items:center;margin-top:-6px;margin-bottom:3px;margin-left:auto;display:grid}.legacy-preview-pause:hover{background:var(--color-bg);color:var(--color-fg)}.legacy-preview-pause:focus-visible{outline:2px solid var(--color-primary);outline-offset:-3px}.legacy-preview-pause:disabled{opacity:.45;cursor:default}.product-demo[data-static=true] *{transition:none!important;animation-play-state:paused!important}.product-demo[data-static=true] .study-scene{opacity:0!important}.product-demo[data-static=true][data-chapter="0"] .study-scene-practice,.product-demo[data-static=true][data-chapter="1"] .study-scene-review,.product-demo[data-static=true][data-chapter="2"] .study-scene-plan,.product-demo[data-static=true][data-chapter="3"] .study-scene-retry{opacity:1!important}.product-demo[data-static=true][data-chapter="3"] .study-right-choice{background:#eaf7ef!important;border-color:#80baa0!important}.product-demo[data-static=true][data-chapter="3"] .study-feedback-right{opacity:1!important}.product-demo[data-static=true] .product-playback-track i{transform:scaleX(.25)}.product-demo[data-static=true][data-chapter="1"] .product-playback-track i{transform:scaleX(.5)}.product-demo[data-static=true][data-chapter="2"] .product-playback-track i{transform:scaleX(.75)}.product-demo[data-static=true][data-chapter="3"] .product-playback-track i{transform:scaleX(1)}@media (width<=560px){.safari-frame-bar{grid-template-columns:minmax(0,1fr) minmax(120px,1.75fr) minmax(0,1fr);gap:12px;padding-inline:12px}.safari-frame-leading{gap:10px}.safari-traffic-lights{gap:5px;padding-right:0}.safari-traffic-lights i{width:8px;height:8px}.safari-navigation-controls,.safari-tab-overview{display:none}.safari-frame-trailing{gap:9px}.study-app-stage{grid-template-columns:38px minmax(0,1fr);height:505px}.product-mini-rail{gap:22px}.product-mini-brand{width:23px;height:25px;font-size:15px}.product-view-heading{height:45px;padding-inline:13px}.product-view-detail{font-size:9px}.study-question{margin:12px;padding:13px}.study-equation{padding:12px 0;font-size:28px}.study-math-choice{gap:7px;padding:9px 7px}.product-faux-button,.product-faux-secondary{padding-inline:10px;font-size:11px}.product-question-count{font-size:10px}.study-review-content,.study-plan-content{padding:23px 15px}.study-review-title h3{font-size:19px}.study-solution{gap:3px;font-size:14px}.study-solution svg{width:13px}.study-plan-title 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