*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,Segoe UI,sans-serif;background:#0f172a;color:#e2e8f0;display:flex;align-items:center;justify-content:center;min-height:100vh}#app{text-align:center;padding:3rem 2rem;background:#1e293bcc;border-radius:1rem;border:1px solid rgba(148,163,184,.15);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);max-width:480px;width:90%}h1{font-size:2rem;background:linear-gradient(135deg,#38bdf8,#818cf8);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:1.5rem}#status{font-size:1.1rem;margin-bottom:1.5rem;min-height:1.5em;transition:color .3s}#check-btn{padding:.6rem 1.8rem;border:none;border-radius:.5rem;background:linear-gradient(135deg,#3b82f6,#6366f1);color:#fff;font-size:1rem;cursor:pointer;transition:transform .15s,box-shadow .15s}#check-btn:hover{transform:translateY(-2px);box-shadow:0 4px 16px #6366f166}#check-btn:active{transform:translateY(0)}