@charset "UTF-8";
:root{font-family:"Trebuchet MS","Microsoft YaHei",system-ui,sans-serif;color:#17345b;background:#f3f8fc;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:4px solid #176dcc;outline-offset:5px}.topbar{max-width:1240px;margin:auto;display:flex;justify-content:space-between;align-items:center;padding:28px 36px}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none;font-size:20px;font-weight:800}.brand small{display:block;font-size:10px;letter-spacing:2px;margin-top:5px}.brandmark{width:48px;height:48px;display:grid;place-items:center;background:#ffc64b;border-radius:16px;font-size:39px;line-height:1;position:relative}.brandmark span{position:absolute;right:-5px;top:-7px;font-size:22px;color:#ed6c33;transform:rotate(10deg)}.age{font-size:14px;background:#fff;padding:10px 17px;border:1px solid #dce6ed;border-radius:24px}main{max-width:1240px;margin:0 auto;padding:0 36px}.intro{display:flex;align-items:center;justify-content:space-between;min-height:218px;margin-bottom:24px;padding:26px 38px;background:#dff2ff;border-radius:30px;overflow:hidden;position:relative}.eyebrow{font-size:12px;font-weight:800;letter-spacing:2px;color:#34739a}h1{font-size:clamp(27px,3vw,40px);letter-spacing:-1px;line-height:1.4;margin:13px 0 10px;font-weight:850}h1 span{color:#1767b5}.intro p{font-size:17px;margin:0;color:#506e83}.intro-art{position:relative;width:245px;height:166px;flex-shrink:0}.intro-art img:first-child{height:156px;width:156px;position:absolute;left:6px;bottom:-8px;transform:rotate(-8deg)}.intro-art img:last-child{width:52px;height:52px;position:absolute;right:1px;bottom:12px;transform:rotate(12deg)}.intro-art span{background:#fff;position:absolute;right:0;top:4px;border-radius:20px 20px 20px 2px;padding:12px 20px;font-size:23px;font-weight:bold;color:#ed7238;transform:rotate(6deg)}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:22px}h2{font-size:23px;margin:0}h2 span{font-size:14px;font-weight:400;color:#617891;margin-left:10px}.speed{border:1px solid #c7dce9;border-radius:24px;background:#fff;padding:11px 18px;font-size:15px;color:#234765;min-height:46px}.speed span{margin-right:6px}.speed[aria-pressed=true]{background:#e0f2ed;border-color:#b7dfcf;color:#246754}.categories{display:flex;flex-wrap:wrap;gap:10px}.category{border:1px solid #d9e4ec;background:#fff;color:#536b80;border-radius:16px;padding:12px 16px;display:flex;align-items:center;gap:8px;min-height:49px;font-weight:700;font-size:15px}.category img{width:25px;height:25px}.category[aria-pressed=true]{background:#245fca;border-color:#245fca;color:#fff;box-shadow:0 4px 0 #1749a1}.category:hover{transform:translateY(-2px)}.sectionline{display:flex;justify-content:space-between;align-items:center;padding:28px 2px 15px;font-size:15px;color:#536c83}.sectionline>span:first-child{font-weight:700}.sectionline>span:last-child{font-size:13px}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.card{position:relative;border:2px solid #fff;border-radius:24px;background:#fff;overflow:hidden;padding:0;text-align:center;box-shadow:0 4px 0 #e2eaf0;color:#17345b;transition:transform .15s,box-shadow .15s,border-color .15s;min-width:0}.picture{height:166px;margin:9px 9px 0;border-radius:17px;background:var(--tint);display:flex;align-items:center;justify-content:center;position:relative}.picture img{height:118px;width:118px;object-fit:contain;transition:transform .18s}.card:hover{transform:translateY(-4px);box-shadow:0 8px 0 #dce6ed}.card:hover .picture img{transform:rotate(-4deg) scale(1.04)}.card:active{transform:translateY(2px)}.card.playing{border-color:#f2ab26;box-shadow:0 5px 0 #f2c15e}.card.playing .picture img{animation:bob .8s ease-in-out infinite alternate}.sound{position:absolute;right:11px;bottom:10px;background:#ffffffdb;color:#527185;border-radius:50%;display:grid;place-items:center;width:32px;height:32px}.sound svg{width:18px;height:18px}.card.playing .sound{color:#a65c00;background:#ffdc85}.word{display:block;font-size:28px;font-weight:800;line-height:1.3;padding:15px 6px 2px;overflow-wrap:anywhere}.translation{display:block;font-size:15px;color:#657b8c;padding:0 6px 17px}.parent-note{margin:36px 0 24px;padding:24px 28px;display:flex;gap:17px;align-items:center;background:#e5f1eb;border-radius:22px;color:#386459}.note-icon{font-size:37px;line-height:1}.parent-note strong{font-size:17px}.parent-note p{font-size:14px;line-height:1.8;margin:6px 0 0}footer{display:flex;gap:9px;flex-direction:column;text-align:center;font-size:13px;color:#688092;padding:5px 0 40px}footer small{font-size:12px;margin-top:4px}footer a{color:inherit}.now-playing{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);border-radius:24px;background:#17345b;color:#fff;box-shadow:0 8px 30px #17345b30;padding:14px 24px;font-size:17px;max-width:calc(100% - 32px);width:max-content;z-index:3}.now-playing[hidden]{display:none}@keyframes bob{to{transform:translateY(-7px) rotate(3deg)}}@media(min-width:1300px){.picture{height:178px}}@media(max-width:900px){.cards{grid-template-columns:repeat(3,minmax(0,1fr))}.intro-art{width:175px}.intro-art img:first-child{width:132px;height:132px}.intro-art img:last-child{width:35px;height:35px}.intro-art span{font-size:18px}.intro{padding:25px}.intro p{font-size:15px}}@media(max-width:620px){.topbar{padding:20px}.brand{font-size:17px;gap:9px}.brand small{font-size:9px;letter-spacing:1.2px}.brandmark{width:41px;height:41px;font-size:33px}.age{font-size:12px;padding:8px 10px}main{padding:0 18px}.intro{min-height:178px;padding:23px 20px;border-radius:23px;align-items:flex-start;margin-bottom:25px}.eyebrow{font-size:10px;letter-spacing:1.1px}h1{font-size:27px;letter-spacing:-.8px;position:relative;z-index:1}h1 span{display:block}.intro p{font-size:14px;max-width:200px}.intro-art{position:absolute;right:6px;bottom:9px;width:89px;height:113px;opacity:.95}.intro-art img:first-child{width:87px;height:87px;left:0}.intro-art img:last-child{display:none}.intro-art span{font-size:13px;padding:6px 9px;right:1px;top:4px}.toolbar{margin-bottom:16px}h2{font-size:20px}h2 span{font-size:12px;margin-left:5px}.speed{font-size:14px;padding:10px 12px}.categories{gap:8px}.category{font-size:13px;padding:9px 10px;border-radius:13px;gap:6px;min-height:44px}.category img{height:22px;width:22px}.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.picture{height:136px;margin:7px 7px 0;border-radius:14px}.picture img{height:94px;width:94px}.card{border-radius:20px}.word{font-size:25px;padding-top:12px}.translation{font-size:14px;padding-bottom:15px}.sectionline{font-size:14px;padding-top:24px}.parent-note{padding:19px 17px;align-items:flex-start;gap:10px}.parent-note strong{font-size:16px}.parent-note p{font-size:13px}.now-playing{bottom:16px;font-size:15px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}
.ipa{display:block;font-family:"Segoe UI","Arial",sans-serif;font-size:16px;font-weight:400;line-height:1.5;color:#526c83;padding:2px 8px 7px;overflow-wrap:anywhere}
[hidden]{display:none!important}.lesson-toolbar{display:flex;justify-content:space-between;gap:12px;margin:8px 0 22px}.back-button{border:1px solid #c7dce9;background:white;color:#234765;border-radius:24px;font-size:16px;padding:12px 20px;min-height:48px}.lesson-hero{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center;background:var(--tint);padding:35px;border-radius:30px}.big-animal{display:grid;place-items:center;border:0;border-radius:26px;background:#ffffff8c;min-height:340px;padding:20px;width:100%}.big-animal img{width:min(100%,300px);height:300px;object-fit:contain;animation:animal-pop .5s cubic-bezier(.2,.8,.3,1.15)}@keyframes animal-pop{from{opacity:0;transform:scale(.45)}to{opacity:1;transform:scale(1)}}.lesson-word h1{font-size:clamp(40px,5vw,64px);line-height:1.15;overflow-wrap:anywhere;margin:15px 0 10px}.lesson-ipa{font:24px/1.5 "Segoe UI",Arial,sans-serif;margin:0;color:#466077}.lesson-ipa small{font:13px "Microsoft YaHei",sans-serif;background:#ffffffaa;padding:4px 8px;border-radius:9px;vertical-align:middle}.lesson-zh{font-size:24px;margin:8px 0 23px}.pronounce{display:inline-flex;align-items:center;justify-content:center;gap:10px;border:0;background:#245fca;color:white;font-size:18px;font-weight:700;border-radius:19px;padding:16px 24px;min-height:56px;box-shadow:0 4px 0 #19499a}.pronounce svg{width:25px;height:25px}.pronounce.playing{background:#174795}.big-animal.playing img{animation:bob .65s infinite alternate}.sentence-section{margin:32px 0}.sentence-section h2{margin-bottom:17px}.sentence-section h2 span{display:inline-block}.sentences{display:grid;gap:12px}.sentence{display:flex;gap:17px;align-items:center;text-align:left;border:2px solid white;border-radius:20px;background:white;padding:20px 24px;color:#17345b;width:100%;min-height:100px}.sentence-number{display:grid;place-items:center;border-radius:15px;background:#e6f0ff;color:#245fca;width:40px;height:40px;flex-shrink:0;font-size:19px;font-weight:bold}.sentence-text{flex:1;min-width:0}.sentence-text strong{display:block;font-size:24px;line-height:1.4}.sentence-text>span{display:block;margin-top:5px;color:#657b8c;font-size:15px;line-height:1.5}.sentence-sound{display:grid;place-items:center;width:42px;height:42px;flex-shrink:0;background:#eaf2ff;border-radius:50%;color:#245fca}.sentence-sound svg{width:22px;height:22px}.sentence.playing{border-color:#f2ab26;background:#fff9e9}.video-section{margin:30px 0}.video-section h2{margin-bottom:17px}.video-content video{display:block;width:100%;max-height:650px;background:#142a43;border-radius:24px;object-fit:contain}.video-help{color:#657b8c;font-size:15px;text-align:center}.video-empty{background:#e8f0f6;border-radius:20px;padding:27px;font-size:16px;line-height:1.7;color:#5b7084}#detail{padding-bottom:20px}@media(max-width:620px){.lesson-toolbar{margin-top:2px}.back-button{font-size:14px;padding:10px 15px}.lesson-hero{grid-template-columns:1fr;gap:22px;padding:20px;border-radius:25px}.big-animal{min-height:230px;padding:12px}.big-animal img{width:210px;height:210px}.lesson-word{text-align:center}.lesson-word h1{font-size:43px;margin:10px 0}.lesson-ipa{font-size:22px}.lesson-zh{font-size:20px;margin-bottom:18px}.pronounce{width:100%;font-size:17px}.sentence{padding:17px 13px;gap:10px}.sentence-text strong{font-size:21px}.sentence-text>span{font-size:14px}.sentence-number{width:30px;height:35px;font-size:16px}.sentence-sound{width:34px;height:34px}.sentence-section h2 span{font-size:13px}.video-content video{max-height:480px;border-radius:20px}}