*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:#333}.App{min-height:100vh;padding:20px}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;gap:20px}.spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #667eea;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.spinning{animation:spin 1s linear infinite}.animate-fadeIn{animation:fadeIn .3s ease-out forwards}.device-list-container{max-width:1200px;margin:0 auto;background:#fff;border-radius:16px;box-shadow:0 20px 40px 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