:root{--primary-color: #007AFF;--background-color: #F5F5F7;--text-color: #1D1D1F;--border-radius: 12px}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--background-color);color:var(--text-color)}.app{min-height:100vh;padding:2rem;box-sizing:border-box;position:relative}.content{max-width:1200px;margin:0 auto}h1{font-size:2.5rem;font-weight:700;margin-bottom:2rem;text-align:center}h2{font-size:1.5rem;font-weight:600;margin-bottom:1.5rem;text-align:center}.device-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:2rem;padding:1rem}.device-item{display:flex;flex-direction:column;align-items:center;cursor:pointer;transition:transform .2s;padding:1rem;border-radius:var(--border-radius);background:white;box-shadow:0 2px 10px #0000001a}.device-item:hover{transform:scale(1.05)}.device-item.selected{background:var(--primary-color);color:#fff}.device-icon{font-size:3rem;margin-bottom:.5rem}.device-name{font-size:.9rem;text-align:center;word-break:break-word}.drag-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,122,255,.9);display:flex;align-items:center;justify-content:center;z-index:1000}.drag-message{color:#fff;font-size:2rem;font-weight:600}.transfer-status{position:fixed;bottom:2rem;left:50%;transform:translate(-50%);background:white;border-radius:var(--border-radius);padding:1rem;box-shadow:0 4px 20px #00000026;width:90%;max-width:400px}.transfer-content{display:flex;align-items:center;gap:1rem;margin-bottom:.5rem}.transfer-icon{font-size:1.5rem}.transfer-title{font-weight:600;margin-bottom:.2rem}.transfer-filename{font-size:.9rem;color:#666}.progress-bar{height:4px;background:#eee;border-radius:2px;overflow:hidden}.progress-fill{height:100%;background:var(--primary-color);transition:width .3s ease}.device-name-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.modal-content{background:white;padding:2rem;border-radius:var(--border-radius);width:90%;max-width:400px}.modal-content h2{margin-top:0;margin-bottom:1.5rem}.modal-content form{display:flex;flex-direction:column;gap:1rem}.modal-content input{padding:1rem;border:2px solid #eee;border-radius:var(--border-radius);font-size:1rem;transition:border-color .2s}.modal-content input:focus{border-color:var(--primary-color);outline:none}button{padding:1rem;background:var(--primary-color);color:#fff;border:none;border-radius:var(--border-radius);font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .2s}button:disabled{background:#ccc}button:hover:not(:disabled){background:#0056b3}.no-devices{text-align:center;padding:3rem;color:#666}.no-devices p{margin:0}.no-devices .subtitle{font-size:.9rem;margin-top:.5rem}