body {
  font-family: sans-serif;
  background: linear-gradient(135deg,#0f2027,#203a43,#2c5364);
  color: #fff;
}

.panel {
  width: 420px;
  margin: 40px auto;
  background: #111;
  padding: 20px;
  border-radius: 12px;
  text-align: center;
}

.tabs button {
  margin: 5px;
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  background: #2c5364;
  color: #fff;
  cursor: pointer;
}

.tab {
  display: none;
  margin-top: 20px;
}

input {
  width: 100%;
  padding: 8px;
  border-radius: 6px;
  border: none;
}

button {
  margin-top: 10px;
}