*{box-sizing:border-box;margin:0;padding:0}body{color:#333;background:#f5f5f5;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.container{text-align:center;background:#fff;border-radius:12px;max-width:600px;margin:100px auto;padding:2rem;box-shadow:0 2px 12px #00000014}h1{color:#1a1a1a;margin-bottom:2rem;font-size:2rem}.ping-btn{color:#fff;cursor:pointer;background:#4f46e5;border:none;border-radius:8px;padding:12px 32px;font-size:1rem;transition:background .2s}.ping-btn:hover{background:#4338ca}.ping-btn:disabled{cursor:not-allowed;background:#9ca3af}.response-box{background:#ecfdf5;border:1px solid #a7f3d0;border-radius:8px;margin-top:2rem;padding:1rem}.response-box p{font-size:1.1rem}.response-box strong{color:#059669}