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@media(max-width:700px){.site-header{height:72px;padding:0 22px}.brand{font-size:28px}.brand-cn{font-size:10px}.brand-mark{transform:scale(.85);margin-right:-3px}.site-header nav{gap:15px}.site-header nav>a span{display:none}.site-header .quiet{font-size:10px;gap:7px}.library-hero,.library-section,.site-footer{margin-left:22px;margin-right:22px}.library-hero{padding:40px 0 36px;grid-template-columns:1fr;position:relative}.library-hero>.hero-art{position:absolute;top:105px;right:0;width:145px;height:200px;z-index:-1;opacity:.75;border-radius:5px 55px 5px 5px}.art-caption{font-size:5px;left:12px;top:18px}.disc{height:170px;width:170px;left:25px;top:45px}.disc-label{height:65px;width:65px;padding:7px 3px 9px}.disc-label span{font-size:15px}.disc-label small{font-size:3px;letter-spacing:0}.disc:after{width:7px;height:7px}.waveform{left:10px;bottom:15px;height:27px;padding:3px 7px;gap:2px;transform:scale(.6);transform-origin:left bottom}.art-note{display:none}.library-hero .eyebrow{font-size:8px;letter-spacing:1.6px}.library-hero h1{font-size:38px;margin-top:24px;line-height:1.4}.hero-copy{font-size:11px;line-height:1.9;letter-spacing:0}.hero-cta{margin-top:23px;padding:14px 17px;font-size:11px;gap:10px}.resume-label{font-size:10px}.section-heading{align-items:center;margin-bottom:21px}.section-heading h2{font-size:22px}.section-heading .eyebrow{font-size:8px;letter-spacing:1.5px;margin-bottom:9px}.section-heading>p{max-width:85px;line-height:1.9;font-size:9px;text-align:right}.small-dot{padding:0 3px}.lesson-grid{grid-template-columns:repeat(2,1fr);gap:12px}.lesson-card{padding:15px 14px 12px}.card-top{margin-bottom:24px}.paper-code{font-size:7px;letter-spacing:1px}.card-number{font-size:17px}.lesson-card h3{font-size:20px}.card-subtitle{font-size:10px}.card-meta{font-size:8px;gap:8px;margin:18px 0 13px;flex-wrap:wrap}.card-meta>span:last-child{display:none}.progress-caption{font-size:8px}.card-go{width:24px;height:24px}.card-go 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button{font-size:10px;gap:4px}.toggle-track{width:24px;height:14px}.toggle-track:after{width:10px;height:10px}.subtitle-toggles button[aria-pressed=true] .toggle-track:after{transform:translateX(10px)}.reading-toolbar{margin-top:10px}.reading-toolbar>span{font-size:9px}.reading-toolbar .quiet{font-size:9px;padding:4px}.reading{height:350px;min-height:220px;max-height:55dvh;padding-bottom:25px}.en{font-size:17px;line-height:1.65}.zh{font-size:11px}.sentence-row{padding:13px 8px;gap:8px}.sentence-number{font-size:9px;min-width:14px}.sentence-timestamp{font-size:8px;padding-top:2px}.player{position:sticky;bottom:10px;z-index:3;padding:14px 14px 12px;box-shadow:0 0 25px #344b2520}.player-top{font-size:9px}.timeline{margin:10px 0 15px;gap:9px}.player-controls{gap:7px}.transport{gap:15px}.play-button{width:43px;height:43px}.player-options{min-width:45px}.player-options select{font-size:10px;padding:5px 3px}.loop-button{min-width:25px;padding:5px 0}.icon-button{padding:0}.icon-button 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