:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light;color:#213547;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}.media-checker{display:flex;flex-direction:column;align-items:center;padding:20px;font-family:sans-serif}.error{color:red;margin-bottom:10px;padding:10px;border:1px solid red;border-radius:4px;background-color:#ffe6e6}.controls{display:flex;gap:40px;flex-wrap:wrap;justify-content:center}.control-group{display:flex;flex-direction:column;align-items:center;border:1px solid #ccc;padding:20px;border-radius:8px;min-width:300px;background-color:#f9f9f9}.video-container{margin-top:15px;width:320px;height:240px;background-color:#000;display:flex;justify-content:center;align-items:center;border-radius:4px;overflow:hidden}.video-preview{width:100%;height:100%;object-fit:cover}.audio-meter-container{margin-top:15px;width:100%;height:20px;background-color:#ddd;border-radius:10px;overflow:hidden}.audio-meter-fill{height:100%;background-color:#4caf50;transition:width .1s ease-out}button{padding:10px 20px;font-size:16px;cursor:pointer;background-color:#007bff;color:#fff;border:none;border-radius:4px;transition:background-color .2s}button:hover{background-color:#0056b3}.seo-content{max-width:800px;margin:40px auto;padding:0 20px;text-align:left;color:#333;line-height:1.6}.seo-section{margin-bottom:30px}.seo-section h2{font-size:2rem;color:#2c3e50;margin-bottom:15px}.seo-section h3{font-size:1.5rem;color:#34495e;margin-bottom:10px}.seo-section h4{font-size:1.2rem;color:#2c3e50;margin-bottom:5px}.seo-section p{margin-bottom:15px}.seo-section ul{list-style-type:disc;padding-left:20px;margin-bottom:15px}.seo-section li{margin-bottom:8px}.faq-item{background-color:#f8f9fa;padding:15px;border-radius:8px;margin-bottom:15px;border-left:4px solid #007bff}@media(prefers-color-scheme:dark){.seo-content{color:#e0e0e0}.seo-section h2,.seo-section h3,.seo-section h4{color:#ecf0f1}.faq-item{background-color:#2c3e50;border-left-color:#3498db}}.App{text-align:center;display:flex;flex-direction:column;min-height:100vh}.App-header{background-color:#282c34;padding:40px 20px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff}.App-header h1{margin:0;font-size:2.5rem}.App-header p{margin:10px 0 0;font-size:1.2rem;opacity:.8}main{padding:20px;flex:1}.App-footer{background-color:#f1f1f1;padding:20px;margin-top:auto;color:#666}@media(prefers-color-scheme:dark){.App-footer{background-color:#1a1a1a;color:#888}}