:root{--blue:#4d79f6;--violet:#5139ee;--mint:#55e9a2;--paper:#f8f7f2;--ink:#182033;--muted:#596375;--line:#dcdfe4;--deep-blue:#304eb8;--radius:24px;font-family:"Avenir Next","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0}a{color:inherit;text-decoration:none}button{font:inherit}img{display:block;max-width:100%;height:auto}button,a{-webkit-tap-highlight-color:transparent}button:not(:disabled),a{touch-action:manipulation}[hidden]{display:none!important}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--violet);outline-offset:5px}p{line-height:1.8}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-weight:650}h2{font-size:clamp(30px,3.5vw,44px);letter-spacing:-1.5px;line-height:1.35}h3{font-size:22px;line-height:1.5}section[id]{scroll-margin-top:16px}.container{width:min(1160px,calc(100% - 96px));margin-inline:auto}.skip-link{position:fixed;top:-100px;left:20px;background:white;padding:12px 20px;z-index:10}.skip-link:focus{top:12px}
.site-header{position:sticky;top:0;z-index:5;background:var(--paper);border-bottom:1px solid #e6e7e5}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:88px}.brand{display:inline-flex;align-items:center;gap:10px;font-size:23px;font-weight:700;letter-spacing:-.5px;white-space:nowrap}.brand img{width:48px;height:48px;object-fit:contain}.brand-cn{font-weight:550;font-size:19px}.site-header nav{display:flex;gap:32px;font-size:15px;color:#3f495b}.site-header nav a{padding:13px 0}.site-header nav a:hover,.text-link:hover,.footer-top>a:last-child:hover{text-decoration:underline;text-underline-offset:5px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:54px;padding:14px 26px;border:0;border-radius:14px;background:var(--deep-blue);color:#fff;font-size:16px;font-weight:600;line-height:1.5;text-align:center}.button:hover:not(:disabled){background:#253e98}.button-small{min-height:44px;padding:11px 21px;font-size:14px;border-radius:12px}
.hero{display:grid;grid-template-columns:1.07fr 1fr;gap:20px;align-items:center;padding-block:66px 74px;min-height:660px}.intro-line{display:flex;align-items:center;gap:10px;font-size:15px;margin-bottom:26px;color:#43516c}.hello-dot{width:9px;height:9px;background:#308855;border-radius:50%;box-shadow:0 0 0 5px #55e9a229}.hero h1{font-size:clamp(40px,4.8vw,64px);letter-spacing:-2.8px;line-height:1.3}.hero-description{margin-top:26px;font-size:18px;color:var(--muted)}.hero-actions{display:flex;gap:26px;align-items:center;margin-top:34px}.text-link{font-size:15px;font-weight:550;white-space:nowrap}.text-link span{margin-left:4px}.hero-note{font-size:12px;color:var(--muted);margin-top:19px;max-width:410px}.hero-art{position:relative;min-height:510px}.mark-character{position:absolute;top:45px;left:50%;width:440px;max-width:110%;transform:translateX(-50%)}.greeting{position:absolute;z-index:2;top:1px;left:22px;padding:16px 24px;background:white;border:1px solid #e5e7ed;border-radius:24px 24px 24px 5px;display:flex;align-items:center;gap:20px;font-size:25px;box-shadow:0 8px 22px #18203308}.greeting-wave{display:flex;gap:4px;align-items:center;height:28px}.greeting-wave i{width:4px;height:12px;background:#338355;border-radius:4px}.greeting-wave i:nth-child(2),.greeting-wave i:nth-child(4){height:20px}.greeting-wave i:nth-child(3){height:28px}.picture-peek{position:absolute;right:-6px;bottom:48px;width:176px;padding:7px;background:white;border:1px solid #e0e7dd;border-radius:18px;box-shadow:0 12px 24px #1820330c;transform:rotate(5deg)}.picture-peek img{border-radius:12px;width:100%;aspect-ratio:512/341;object-fit:cover}.picture-peek span{display:block;font-size:14px;font-weight:600;padding:9px 5px 4px;text-align:center}.art-caption{position:absolute;bottom:0;left:0;width:100%;text-align:center;font-size:11px;color:var(--muted)}
.about-section{background:#e9f2ed;border-block:1px solid #d7e7dc}.about-inner{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding-block:48px}.about-inner h2{font-size:34px}.about-inner p{font-size:15px;color:#45594e}.about-inner p+p{margin-top:10px}.section{padding-block:96px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:40px;margin-bottom:36px}.section-kicker{font-size:14px;margin-bottom:16px;color:var(--muted)}.section-heading>p{font-size:16px;color:var(--muted);padding-bottom:5px}.scene-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.scene img{width:100%;height:auto;aspect-ratio:512/341;object-fit:contain;background:#e9eee8;border-radius:20px}.scene figcaption{padding:18px 3px 0}.scene figcaption>span{font-size:14px;color:var(--muted)}.scene figcaption p{font-size:25px;line-height:1.4;font-weight:600;letter-spacing:-.7px;margin-top:6px}.section-note{font-size:12px;color:var(--muted);margin-top:20px;line-height:1.8}.practice-panel{display:grid;grid-template-columns:.88fr 1.12fr;gap:72px;margin-top:64px;padding:44px;background:white;border:1px solid var(--line);border-radius:var(--radius)}.practice-intro h3{font-size:28px;letter-spacing:-.7px}.practice-intro>p{margin-top:16px;color:var(--muted);font-size:15px}.practice-intro .section-note{font-size:12px}.step-buttons{display:flex;flex-wrap:wrap;gap:6px;padding-bottom:18px;border-bottom:1px solid var(--line)}.step-buttons button{flex:1;min-height:44px;padding:10px 11px;border:0;border-radius:10px;color:#48556c;background:#f1f3f8;font-size:14px;cursor:pointer;white-space:nowrap}.step-buttons button[aria-pressed="true"]{background:var(--deep-blue);color:white}.step-content{padding-top:26px}.step-content>span{font-size:13px;color:var(--muted)}#step-example{font-size:42px;letter-spacing:-1.5px;font-weight:600;line-height:1.4;margin-top:8px}#step-description{font-size:15px;color:var(--muted);margin-top:12px;min-height:55px}
.parents-section{background:#e9edfa;padding-block:76px}.parents-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:90px}.parents-lead{font-size:16px;margin-top:24px;color:#4e5e7a}.parent-points{display:grid;gap:28px}.parent-points article{display:flex;gap:22px}.point-symbol{flex:0 0 44px;width:44px;height:44px;background:#fff;border-radius:50%;font-size:28px;display:flex;align-items:center;justify-content:center;color:var(--deep-blue)}.parent-points h3{font-size:20px;margin:2px 0 6px}.parent-points p{font-size:15px;color:#4e5e7a}.download-heading{text-align:center}.download-heading>img{margin:0 auto 20px;width:80px;height:80px}.download-heading p{margin-top:16px;color:var(--muted)}.download-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:38px;align-items:stretch}.download-card{padding:30px;background:white;border:1px solid var(--line);border-radius:20px;display:flex;flex-direction:column;align-items:flex-start}.platform{font-size:15px;font-weight:600;color:var(--deep-blue);margin-bottom:20px}.download-card h3{font-size:21px}.download-card>p{font-size:14px;color:var(--muted);margin-block:10px 25px}.download-card .button{width:100%;margin-top:auto;font-size:14px;overflow-wrap:anywhere}.pending{background:#eef0f4;color:#667085;cursor:default}.miniapp-card{background:#edf8f1;border-color:#cee8d5}.miniapp-card .platform{color:#286b47}.miniapp-qr{margin:0 auto;width:160px;height:160px;object-fit:contain;border-radius:12px}.download-card .miniapp-note{font-size:11px;margin:12px 0 0;width:100%;text-align:center}.download-note{text-align:center;font-size:13px;color:var(--muted);margin-top:28px}.faq-section{padding-bottom:90px;display:grid;grid-template-columns:1fr 1.7fr;gap:60px}.faq-section h2{font-size:28px;line-height:1.5}.faq-list{border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line)}summary{font-size:16px;padding:22px 30px 22px 0;cursor:pointer;position:relative;list-style:none;line-height:1.6}summary::-webkit-details-marker{display:none}summary:after{content:"+";position:absolute;right:2px;top:20px;color:var(--deep-blue);font-size:22px}details[open] summary:after{content:"−"}details p{font-size:14px;color:var(--muted);padding:0 24px 24px 0;max-width:640px}.site-footer{background:#eeefeb;border-top:1px solid #dcded8;padding:34px 0 28px}.footer-top{display:flex;align-items:center;justify-content:space-between;gap:24px}.footer-top .brand{font-size:19px}.footer-top .brand img{width:40px;height:40px}.footer-top p{font-size:14px;color:var(--muted)}.footer-top>a:last-child{font-size:14px}.footer-bottom{display:flex;flex-wrap:wrap;gap:12px 22px;border-top:1px solid #d5d9d3;margin-top:26px;padding-top:20px;font-size:12px;color:#596375}.footer-bottom a:hover{text-decoration:underline}.footer-bottom span{overflow-wrap:anywhere}
.greeting{appearance:none;color:var(--ink);font-weight:400;text-align:left;cursor:pointer}.greeting:hover{border-color:#9eb4f5}.greeting[aria-pressed="true"]{background:#edf8f1;border-color:#a8c8b3}.greeting[aria-pressed="true"] .greeting-wave i{background:#286b47}
@media(min-width:1400px){.hero{min-height:720px}.hero-art{transform:scale(1.04)}}
@media(max-width:1000px){.container{width:calc(100% - 56px)}.hero{gap:0;padding-block:44px 60px;min-height:600px}.hero h1{font-size:48px}.hero-description{font-size:16px}.hero-actions{gap:16px;flex-wrap:wrap}.hero-art{min-height:460px}.mark-character{width:380px;top:55px}.greeting{font-size:21px;left:8px;padding:14px 18px;gap:14px;top:14px}.picture-peek{width:140px;right:0;bottom:42px}.practice-panel{padding:30px;gap:32px}.parents-layout{gap:40px}.download-card{padding:24px}.download-card h3{font-size:18px}.scene figcaption p{font-size:22px}.site-header nav{gap:22px}.about-inner{gap:35px}.about-inner h2{font-size:29px}}
@media(max-width:760px){html{scroll-padding-top:84px}.container{width:calc(100% - 40px)}.header-inner{min-height:76px;gap:14px}.brand{font-size:21px;gap:7px}.brand img{width:40px;height:40px}.brand-cn{font-size:17px}.site-header nav{display:none}.button-small{padding-inline:16px}.hero{grid-template-columns:1fr;padding-block:38px 40px;gap:30px}.intro-line{font-size:13px;margin-bottom:22px}.hero h1{font-size:clamp(38px,8.5vw,58px);letter-spacing:-1.7px}.hero-description{font-size:16px;margin-top:22px}.hero-actions{margin-top:26px;gap:20px}.hero-actions .button{font-size:15px;padding-inline:20px}.text-link{font-size:14px}.hero-note{font-size:11px;margin-top:16px}.hero-art{width:min(420px,100%);margin-inline:auto;min-height:440px}.mark-character{width:365px;top:48px;max-width:115%}.greeting{top:3px;left:12px}.picture-peek{right:4px;bottom:40px;width:142px}.about-inner{grid-template-columns:1fr;gap:18px;padding-block:32px}.about-inner h2{font-size:28px}.section{padding-block:56px}.section-heading{display:block;margin-bottom:28px}.section-heading>p{margin-top:20px;font-size:14px}.section-kicker{font-size:13px;margin-bottom:12px}h2{font-size:32px;letter-spacing:-1px}.scene-grid{gap:28px;grid-template-columns:1fr}.scene{display:grid;grid-template-columns:1.2fr 1fr;align-items:center;gap:18px}.scene img{border-radius:14px}.scene figcaption{padding:0}.scene figcaption>span{font-size:12px}.scene figcaption p{font-size:clamp(17px,4.5vw,23px);letter-spacing:-.4px}.section-note{font-size:11px}.practice-panel{grid-template-columns:1fr;gap:26px;padding:26px 22px;margin-top:38px;border-radius:20px}.practice-intro h3{font-size:26px}.practice-intro h3 br{display:none}.practice-intro>p{font-size:14px;margin-top:12px}.practice-intro .section-note{font-size:11px}.step-buttons button{font-size:12px;padding-inline:8px}.step-content{padding-top:20px}#step-example{font-size:36px}#step-description{font-size:14px;min-height:76px}.parents-section{padding-block:50px}.parents-layout{grid-template-columns:1fr;gap:32px}.parents-layout h2 br{display:none}.parents-lead{font-size:15px;margin-top:18px}.parents-lead br{display:none}.parent-points{gap:24px}.parent-points article{gap:16px}.parent-points h3{font-size:18px}.parent-points p{font-size:14px}.download-heading h2{font-size:28px}.download-heading>img{width:64px;height:64px;margin-bottom:20px}.download-heading p{font-size:14px}.download-grid{grid-template-columns:1fr;gap:14px;margin-top:28px}.download-card{padding:24px}.download-card h3{font-size:22px}.platform{margin-bottom:10px}.download-card>p{margin-block:8px 20px}.download-card .button{font-size:15px}.download-note{font-size:12px;margin-top:22px}.faq-section{display:block;padding-bottom:56px}.faq-section h2{font-size:26px;margin-bottom:22px}summary{font-size:15px;padding-block:18px}.footer-top{flex-wrap:wrap;gap:14px}.footer-top p{order:3;width:100%;font-size:13px}.footer-top .brand{font-size:18px}.footer-bottom{font-size:11px;margin-top:22px;padding-top:18px}.site-footer{padding-block:28px}.desktop-break{display:none}}
@media(max-width:360px){.container{width:calc(100% - 32px)}.hero-actions{gap:16px}.hero-actions .button{padding-inline:16px;font-size:14px}.text-link{font-size:13px}.hero-art{min-height:410px}.mark-character{width:335px}.picture-peek{width:125px;bottom:40px}.greeting{left:0}.step-buttons{gap:4px}.step-buttons button{padding-inline:5px}.practice-panel{padding-inline:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}