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14px}.step-hint{font-size:12px}.addend-group .ball{width:30px;height:30px;font-size:12px}.addend-group{gap:4px;padding:6px}.takeaway-slot{width:30px;height:30px}#scenePractice .addend-label{font-size:11px}.choice-btn{font-size:20px;padding:12px 0}.practice-choices{gap:6px}}@media (max-height: 500px) and (orientation: landscape){.top-bar{padding:4px 0;font-size:11px}.scene{padding:8px}.menu-card{width:170px;min-height:180px}.menu-card-icon{height:36px}.menu-equation{font-size:18px;height:30px;gap:2px}.menu-equation .op{font-size:15px}.menu-card-title{font-size:20px}.example-title{font-size:18px;margin-bottom:4px}.equation{padding:6px 14px;margin:4px 0}.step-hint{margin-top:4px}.mascot{bottom:50px;font-size:28px}#controls{padding:4px 8px}}#sceneSubIntro .song-title{margin-bottom:12px}.sub-concept{display:flex;flex-direction:column;align-items:center;gap:6px;margin-bottom:14px}.sub-concept-text{font-size:22px;font-weight:700;color:var(--blue);font-family:YouYuan,幼圆,KaiTi,楷体,Microsoft 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cubic-bezier(.34,1.56,.64,1)}.sub-demo-balls{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;width:100%}.sub-demo-ball{animation:popIn .4s cubic-bezier(.34,1.56,.64,1)}.sub-demo-ball.fly-away,.ball.fly-away{animation:flyAway .55s ease-in forwards}.sub-demo-ball.flown{animation:none;width:0!important;min-width:0!important;height:0!important;margin:0;padding:0;opacity:0;overflow:hidden;border:none;pointer-events:none;flex:0 0 0}@keyframes flyAway{0%{transform:translateY(0) scale(1);opacity:1}to{transform:translateY(-60px) scale(.3) rotate(180deg);opacity:0}}#sceneSubExample .example-stage,#sceneSubPractice .practice-stage{gap:10px}.remain-expr{display:flex;align-items:center;justify-content:center;gap:12px;flex:0 0 auto}#sceneSubExample .extras-group{flex-wrap:nowrap;max-width:none;justify-content:center}.takeaway-zone{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;padding:10px 12px;background:#e8a33d14;border:2px dashed var(--orange);border-radius:12px;min-height:60px;transition:box-shadow .3s ease,border-color .3s ease}.takeaway-zone.glow{border-color:var(--red);box-shadow:0 0 14px #e8a33d80}.takeaway-slot{width:54px;height:54px;flex:0 0 auto}.takeaway-slot .ball{width:100%!important;height:100%!important;font-size:0!important}#sceneSubBasicIntro{gap:18px}#sceneSubBasicIntro .song-title{margin-bottom:0}#sceneSubBasicIntro .sub-concept{margin-bottom:0;gap:10px}#sceneSubBasicIntro .sub-concept-emoji{font-size:42px;letter-spacing:10px;margin-bottom:4px}#sceneSubBasicIntro .sub-demo-area{gap:22px}#sceneSubBasicIntro .sub-demo-row{gap:16px}#sceneSubBasicIntro .sub-demo-eq{margin-bottom:4px}#sceneSubBasicIntro .step-hint{margin-top:4px}#sceneSubBasicExample .ball.fly-away{animation:flyAway .6s ease-in forwards}#sceneSubBasicExample .ball-group,#sceneSubBasicPractice .ball-group{margin:0 auto;background:#ffffff80;padding:16px}.sub-demo-label{font-size:14px;font-weight:700;margin-top:8px;margin-bottom:4px}.sub-concept-flow{display:flex;align-items:center;justify-content:center;gap:10px}.sub-concept-flow .flow-word{font-size:16px;font-weight:700;color:var(--ink);background:#ffffffeb;border:1px solid var(--line);padding:4px 12px;border-radius:8px;white-space:nowrap}.sub-concept-flow .concept-arrow{color:var(--ink-soft)}#sceneSubIntro .ten-frame{margin:4px auto}@media (min-width: 641px) and (max-width: 1100px) and (min-height: 550px){.scene{padding:22px}.top-bar{padding:12px 0 10px;font-size:14px}.ball{width:62px;height:62px;font-size:26px}.ten-frame .ball,.ten-frame .slot{width:56px;height:56px;font-size:24px}.ten-frame{gap:10px;padding:16px}.ball-group{gap:10px}.pair-ball{width:52px;height:52px;font-size:22px}.pair-row{font-size:24px;gap:14px}.pair-row .song-lyric{font-size:20px}#sceneIntro .pairs-container{gap:14px}.equation{font-size:48px;padding:14px 32px;gap:12px}.big-op,.answer-box{font-size:42px}.sub-demo-eq{font-size:34px;padding:10px 26px}.menu-card{width:min(250px,29%);min-height:300px;gap:16px}.menu-card-icon{height:72px}.menu-equation{font-size:38px;height:56px;gap:4px}.menu-equation .op{font-size:30px}.menu-card-title{font-size:26px;letter-spacing:1px}.menu-card-desc{font-size:17px}.ctrl-icon{width:58px;height:58px;font-size:26px}.dot{width:54px;height:54px;font-size:22px}.progress-dots{gap:14px}#controls{gap:20px;padding:12px 20px}.song-title{font-size:40px}.practice-title{font-size:38px}#sceneSummary .summary-title,#sceneSubSummary .summary-title,#sceneSubBasicSummary .summary-title{font-size:40px}#sceneSummary .song-full,#sceneSubSummary .song-full,#sceneSubBasicSummary .song-full{font-size:22px;padding:20px 32px}.example-title{font-size:36px}.step-hint{font-size:22px;padding:10px 26px}.practice-feedback{font-size:24px}.choice-btn{font-size:40px;padding:24px 0}.practice-choices{gap:14px;margin:16px auto}.addend-group 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infinite}.menu-card.subject-chinese{background:linear-gradient(150deg,#ff8a5c,#e4573d)}.menu-card.subject-math{background:linear-gradient(150deg,#64a9e8,#4a8fc9)}.menu-card.subject-english{background:linear-gradient(150deg,#7cbf6f,#5fa05a)}#sceneSubject{gap:14px;overflow-y:auto;padding-bottom:12px}.subject-top{display:flex;flex-direction:column;align-items:center;gap:4px;position:relative;width:100%}.subject-back{position:absolute;left:12px;top:2px;display:flex;align-items:center;gap:4px;font-size:16px;color:var(--ink-soft);background:#ffffffe6;border:1.5px solid var(--line);border-radius:999px;padding:8px 16px 8px 10px;cursor:pointer;font-family:inherit;transition:all .2s ease}.subject-back:hover{transform:translate(-3px);color:var(--ink)}.subject-emoji-big{font-size:56px;line-height:1}.subject-name{font-size:32px;font-weight:900;color:var(--ink);font-family:YouYuan,幼圆,KaiTi,楷体,Microsoft YaHei,sans-serif;letter-spacing:4px}.subject-tagline{font-size:14px;color:var(--ink-soft);letter-spacing:2px}.subject-lessons{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,320px));gap:16px;width:100%;max-width:720px;justify-content:center}.lesson-card.subject-chinese:before{background:#e4573d}.lesson-card.subject-math:before{background:#4a8fc9}.lesson-card.subject-english:before{background:#5fa05a}.lesson-emoji{font-size:40px;line-height:1;flex-shrink:0}.lesson-text{flex:1;min-width:0}.lesson-title{font-size:19px;font-weight:800;color:var(--ink);font-family:YouYuan,幼圆,KaiTi,楷体,Microsoft YaHei,sans-serif}.lesson-desc{font-size:13px;color:var(--ink-soft);margin-top:3px}.lesson-badge{flex-shrink:0;font-size:12px;color:#fff;background:var(--orange);border-radius:999px;padding:4px 12px;font-weight:700}.lesson-card.subject-chinese .lesson-badge{background:#e4573d}.lesson-card.subject-math .lesson-badge{background:#4a8fc9}.lesson-card.subject-english .lesson-badge{background:#5fa05a}#sceneLessonIntro{gap:18px}.intro-title{font-size:30px;font-weight:900;color:var(--ink);font-family:YouYuan,幼圆,KaiTi,楷体,Microsoft YaHei,sans-serif;letter-spacing:2px;text-align:center}#sceneLessonIntro .pairs-container{display:flex;flex-direction:column;gap:10px;align-items:center}.pair-emoji{font-size:30px}.pair-dot{width:12px;height:12px;border-radius:50%;flex-shrink:0;background:var(--orange);box-shadow:0 2px #7a5a3726}.pair-row:nth-child(4n+2) .pair-dot{background:var(--blue)}.pair-row:nth-child(4n+3) .pair-dot{background:var(--green)}.pair-row:nth-child(4n) .pair-dot{background:var(--pink)}.intro-go{font-size:22px;font-weight:700;color:var(--green);animation:popIn .6s cubic-bezier(.34,1.56,.64,1);margin-top:8px}#sceneLessonSummary .summary-title{font-size:30px;font-weight:700;color:var(--ink);margin-bottom:14px;font-family:YouYuan,幼圆,KaiTi,楷体,Microsoft 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