:root{color-scheme:light;--kids-paper: #fff9ed;--kids-paper-deep: #f8edda;--kids-surface: #ffffff;--kids-sky: #a9ddf5;--kids-sky-strong: #52add8;--kids-leaf: #66c89a;--kids-leaf-strong: #278966;--kids-mango: #ffc857;--kids-mango-strong: #e69a16;--kids-coral: #ff7a6e;--kids-coral-strong: #d84f4b;--kids-ink: #29435c;--kids-muted: #64788b;--kids-line: #dde7e8;--kids-shadow: 0 18px 50px rgba(41, 67, 92, .12);--kids-shadow-small: 0 8px 22px rgba(41, 67, 92, .1);--kids-radius-xl: 32px;--kids-radius-lg: 24px;--kids-radius-md: 18px;--kids-page-width: 1180px;--kids-font: "Nunito", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif}*{box-sizing:border-box}html{min-width:320px;background:var(--kids-paper);scroll-behavior:smooth}body{margin:0;min-width:320px;min-height:100vh;color:var(--kids-ink);background:radial-gradient(circle at 10% 8%,rgba(255,200,87,.2) 0 7%,transparent 7.2%),radial-gradient(circle at 92% 18%,rgba(169,221,245,.25) 0 9%,transparent 9.2%),var(--kids-paper);font-family:var(--kids-font);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}button,input{font:inherit}button,a{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button{color:inherit}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.fox-mascot{height:auto}:focus-visible{outline:4px solid rgba(41,67,92,.24);outline-offset:3px}.app-shell{min-height:100vh;padding-bottom:calc(86px + env(safe-area-inset-bottom))}.app-shell--immersive{padding-bottom:0}.site-header{width:min(calc(100% - 32px),var(--kids-page-width));height:82px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.brand-mark{display:inline-flex;align-items:center;gap:11px;min-height:52px}.brand-mark__seal{width:46px;height:46px;display:grid;place-items:center;color:var(--kids-ink);background:var(--kids-mango);border:3px solid var(--kids-ink);border-radius:16px 19px 15px 20px;transform:rotate(-3deg);box-shadow:3px 4px 0 var(--kids-ink)}.brand-mark>span:last-child{display:grid;line-height:1.06}.brand-mark strong{font-size:19px;letter-spacing:.03em}.brand-mark small{margin-top:5px;color:var(--kids-muted);font-size:10px;font-weight:900;letter-spacing:.15em}.page{width:min(calc(100% - 32px),var(--kids-page-width));margin:0 auto}.eyebrow{display:inline-flex;align-items:center;gap:7px;color:var(--kids-leaf-strong);font-size:14px;font-weight:900;letter-spacing:.04em}.section-block{margin-top:52px}.section-heading{margin-bottom:19px;display:flex;align-items:end;justify-content:space-between;gap:20px}.section-heading h2{margin:4px 0 0;font-size:clamp(25px,3vw,34px);line-height:1.2}.text-link{min-height:48px;display:inline-flex;align-items:center;gap:5px;color:var(--kids-coral-strong);font-weight:900}.hero-island{min-height:310px;padding:clamp(28px,5vw,56px);display:grid;grid-template-columns:1.2fr .8fr;align-items:center;overflow:hidden;position:relative;background:linear-gradient(135deg,#d8f0fb 0%,var(--kids-sky) 100%);border:3px solid rgba(41,67,92,.12);border-radius:42px 34px 46px 30px;box-shadow:var(--kids-shadow)}.hero-island:before,.hero-island:after{content:"";position:absolute;border-radius:50%;background:#ffffff80}.hero-island:before{width:130px;height:42px;top:24px;left:48%}.hero-island:after{width:210px;height:68px;bottom:-35px;right:24%}.hero-island__copy{position:relative;z-index:2;max-width:610px}.hero-island h1{margin:12px 0 8px;font-size:clamp(38px,6vw,64px);line-height:1.05;letter-spacing:-.035em}.hero-island p{max-width:610px;margin:0;color:#3e6079;font-size:clamp(16px,1.8vw,20px);font-weight:700}.hero-island__mascot{align-self:end;justify-self:end;width:min(31vw,300px);position:relative;z-index:1;margin-bottom:-58px}.hero-island__mascot .fox-mascot{width:100%}.speech-note{position:absolute;z-index:2;top:4%;left:-16%;padding:9px 15px;background:#fff;border:2px solid var(--kids-ink);border-radius:18px 18px 4px;font-size:17px;font-weight:900;transform:rotate(-5deg)}.hero-actions{margin-top:24px;display:flex;flex-wrap:wrap;gap:12px}.hero-actions a{min-height:52px;padding:12px 20px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:17px;font-weight:900;transition:transform .18s ease,box-shadow .18s ease}.hero-actions a:hover{transform:translateY(-2px)}.hero-primary{color:#fff;background:var(--kids-coral);box-shadow:0 5px 0 var(--kids-coral-strong)}.hero-secondary{background:#ffffffdb;border:2px solid rgba(41,67,92,.14);box-shadow:0 4px #29435c1f}.hero-proof{margin-top:20px;display:flex;flex-wrap:wrap;gap:8px}.hero-proof span{padding:5px 10px;color:#315b72;background:#ffffff94;border-radius:999px;font-size:12px;font-weight:900}.learning-loop .section-heading{align-items:start}.learning-loop .section-heading p{max-width:650px;margin:8px 0 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rotate(-.25deg);box-shadow:var(--kids-shadow)}.portal-card--audio{background:#dff4ed}.portal-card--video{background:#ffe5dd}.portal-card__copy{position:relative;z-index:2}.portal-card__icon{width:48px;height:48px;display:grid;place-items:center;background:#fffc;border-radius:16px}.portal-card small{display:block;margin-top:13px;color:var(--kids-muted);font-weight:800}.portal-card h2{margin:1px 0 6px;font-size:clamp(27px,3.5vw,39px);line-height:1.1}.portal-card p{max-width:220px;margin:0;color:var(--kids-muted);font-weight:700}.portal-card__action{min-height:48px;margin-top:12px;display:inline-flex;align-items:center;gap:6px;font-weight:900}.portal-card>img{align-self:end;justify-self:end;width:min(24vw,240px);margin:0 -20px -28px 0}.book-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.book-card{min-width:0}.book-card__button{width:100%;padding:0;text-align:left;background:var(--kids-surface);border:2px solid var(--kids-line);border-radius:var(--kids-radius-lg);overflow:hidden;box-shadow:var(--kids-shadow-small);cursor:pointer;transition:transform .18s ease,box-shadow .18s ease}.book-card__button:hover{transform:translateY(-4px);box-shadow:var(--kids-shadow)}.book-card__button:disabled{cursor:wait;opacity:.72}.book-card__cover{height:170px;position:relative;overflow:hidden;background:var(--kids-paper-deep)}.book-card__cover img{width:100%;height:100%;object-fit:cover}.level-ribbon{position:absolute;top:12px;left:12px;padding:5px 10px;color:var(--kids-ink);background:var(--kids-mango);border-radius:999px;font-size:12px;font-weight:900;box-shadow:0 2px #29435c33}.round-play{position:absolute;right:12px;bottom:12px;width:42px;height:42px;display:grid;place-items:center;color:#fff;background:var(--kids-coral);border-radius:50%;box-shadow:0 4px 0 var(--kids-coral-strong)}.book-card__body{padding:16px}.book-card 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0;font-size:clamp(35px,5vw,52px);line-height:1.05}.page-titlebar p{margin:0;color:var(--kids-muted);font-weight:700}.page-titlebar .fox-mascot{width:230px;margin-bottom:-64px}.back-button{width:50px;height:50px;display:grid;place-items:center;flex:0 0 auto;background:#fff;border:2px solid var(--kids-line);border-radius:17px;box-shadow:0 4px 0 var(--kids-line)}.catalog-content{margin-top:28px}.level-tabs{padding:6px;display:inline-flex;max-width:100%;gap:5px;overflow-x:auto;background:#fff;border:2px solid var(--kids-line);border-radius:20px}.level-tabs button{min-width:64px;min-height:48px;padding:8px 17px;background:transparent;border:0;border-radius:15px;font-weight:900;cursor:pointer}.level-tabs button.active{color:var(--kids-ink);background:var(--kids-mango);box-shadow:inset 0 -3px #29435c1f}.result-count{margin:14px 2px 18px;color:var(--kids-muted);font-weight:700}.catalog-pagination{margin:28px 0 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var(--kids-mango-strong)}.player-page{width:min(calc(100% - 32px),1240px);margin:0 auto;padding:22px 0 40px}.player-header{min-height:70px;margin-bottom:18px;display:grid;grid-template-columns:52px 1fr auto;align-items:center;gap:15px}.player-header small{color:var(--kids-muted);font-weight:800}.player-header h1{margin:0;font-size:clamp(20px,3vw,29px);line-height:1.25}.player-header__type{min-height:44px;padding:8px 14px;display:inline-flex;align-items:center;gap:7px;background:#fff;border:2px solid var(--kids-line);border-radius:999px;font-weight:900}.audio-stage{min-height:520px;padding:clamp(18px,4vw,38px);display:grid;grid-template-columns:minmax(280px,.9fr) minmax(340px,1.1fr);align-items:center;gap:clamp(25px,5vw,64px);background:linear-gradient(145deg,#dff4ed,#eef9f5);border:3px solid rgba(41,67,92,.12);border-radius:38px;box-shadow:var(--kids-shadow)}.audio-stage__art{min-height:380px;position:relative;display:grid;place-items:center;overflow:hidden;background:#fff;border-radius:30px 24px 34px}.audio-stage__art>img:first-child{width:100%;height:100%;position:absolute;inset:0;object-fit:cover}.audio-stage__art .fox-mascot{width:min(75%,330px);position:relative;margin-bottom:-88px;filter:drop-shadow(0 12px 9px rgba(41,67,92,.15))}.audio-stage__lesson{min-width:0}.subtitle-bubble{margin:16px 0 20px;padding:clamp(20px,3vw,32px);text-align:center;background:#fff;border:3px solid var(--kids-ink);border-radius:28px 28px 9px;box-shadow:7px 8px #29435c1f}.subtitle-bubble p{margin:0;color:var(--kids-ink);font-size:clamp(22px,3.3vw,35px);font-weight:900;line-height:1.3}.subtitle-bubble small{display:block;margin-top:11px;color:var(--kids-muted);font-size:clamp(15px,2vw,19px);font-weight:700}.subtitle-bubble 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input{width:100%;height:28px;accent-color:var(--kids-coral);cursor:pointer}.transport__buttons{margin-top:13px;display:grid;grid-template-columns:repeat(5,54px);align-items:center;justify-content:center;gap:clamp(6px,2vw,16px)}.icon-button,.play-button{display:grid;place-items:center;border:0;cursor:pointer}.icon-button{width:52px;height:52px;color:var(--kids-ink);background:#fff;border:2px solid var(--kids-line);border-radius:18px;box-shadow:0 4px 0 var(--kids-line)}.play-button{width:66px;height:66px;margin:0 -6px;color:#fff;background:var(--kids-coral);border-radius:23px;box-shadow:0 6px 0 var(--kids-coral-strong)}.icon-button:active,.play-button:active,.soft-button:active,.continue-play:active{transform:translateY(3px);box-shadow:0 1px #29435c33}.transport__spacer{width:52px}.sentence-sheet{margin-top:24px;padding:clamp(18px,4vw,34px);background:#fff;border:2px solid var(--kids-line);border-radius:var(--kids-radius-xl)}.sentence-sheet h2{margin:0 0 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minmax(280px,360px);align-items:start;gap:18px}.video-main{min-width:0;padding:clamp(12px,2vw,20px);background:#ffe5dd;border:3px solid rgba(41,67,92,.12);border-radius:30px;box-shadow:var(--kids-shadow)}.video-stage{aspect-ratio:16 / 9;position:relative;overflow:hidden;background:#111f2b;border:4px solid var(--kids-ink);border-radius:22px 22px 10px 10px}.video-stage video{width:100%;height:100%;object-fit:contain}.video-stage__placeholder{position:absolute;inset:0;display:grid;place-items:center;align-content:center;color:#fff;background:radial-gradient(circle at 50% 22%,#3e6079,#203548 70%)}.video-stage__placeholder img{width:min(39%,300px);max-height:70%;object-fit:contain}.video-stage__placeholder p{margin:-14px 0 0;display:flex;align-items:center;gap:8px;font-weight:900}.video-caption-panel{padding:18px 20px 16px;background:#fff;border:2px solid var(--kids-line);border-top:0;border-radius:0 0 22px 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