:root{--ink:#213c34;--muted:#617266;--green:#22614d;--lime:#dff0bb;--bg:#eaf0e4;--line:#e6ebe3;--surface:#f4f5eb;--white:#f4f5eb;--serif:Georgia,'Songti SC',serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.65 'Microsoft YaHei','PingFang SC',system-ui,sans-serif}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;background:none;color:inherit}button:focus-visible,a:focus-visible{outline:3px solid #a0c56d;outline-offset:4px}a{color:inherit;text-decoration:none}button:disabled{opacity:.38;cursor:default}.topbar{height:88px;border-bottom:1px solid var(--line);background:var(--surface,#f4f5eb);display:flex;align-items:center;justify-content:space-between;padding:0 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@media(min-width:1550px){.parent{padding-top:50px}.lesson-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.art{height:150px}.parent{max-width:1330px}}
@media(max-width:1120px){.topbar{padding:0 24px}.admin-shell{grid-template-columns:165px 1fr}.admin-main{padding:25px 22px}.library-layout{grid-template-columns:215px 1fr}.lesson-admin-grid{grid-template-columns:210px 1fr}.editor{padding:18px}.prototype span{display:none}.lesson-layout{grid-template-columns:minmax(0,1fr) 280px}}
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@media(max-width:520px){.parent>.page-heading>.chip{display:none}.course-hero{display:block}.hero-art{position:absolute;right:7px;top:22px;width:90px;height:135px;opacity:.65;transform:none;pointer-events:none}.hero-art svg{width:120px}.art-word{display:none}}
video.soft-picture-video{filter:sepia(.16) saturate(.82) contrast(.88) brightness(.97)}#softPictureButton{flex-shrink:0}#softPictureButton[aria-pressed="true"]{background:#dce8cd;border-color:#74956b}.video-info{flex-wrap:wrap}