body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
  font-family: "Segoe UI", system-ui, sans-serif;
  color: #e2e8f0;
}
.card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  padding: 28px 36px;
  max-width: 520px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}
h1 { margin-top: 0; color: #7dd3fc; }
button {
  padding: 4px 14px;
  border-radius: 8px;
  border: 1px solid #38bdf8;
  background: #0ea5e9;
  color: #fff;
  cursor: pointer;
}
button:hover { background: #0284c7; }
#count { font-weight: 700; color: #4ade80; }