body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg,#061421,#123a55);
  color: white;
}
.app {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 25px;
}
.card {
  width: 100%;
  max-width: 420px;
  padding: 38px 30px;
  border-radius: 26px;
  text-align: center;
  background: rgba(0,0,0,.42);
  box-shadow: 0 25px 60px rgba(0,0,0,.45);
}
h1 {
  font-size: 48px;
  margin: 0;
}
p {
  margin-bottom: 30px;
}
input, button {
  width: 100%;
  padding: 15px;
  margin: 8px 0;
  border-radius: 14px;
  border: 0;
  font-size: 17px;
}
button {
  background: linear-gradient(#55bcff,#0878e8);
  color: white;
  font-weight: 800;
}
#msg {
  margin-top: 12px;
  color: #ffb1b1;
}