body {
    display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
}
.container {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    width: 350px;
    text-align: center;
}
h2 { margin-bottom: 20px; color: #333; }
input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
}
button {
    width: 100%;
    padding: 10px;
    background: #0056b3;
    border: none;
    color: #fff;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
}

.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}
.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}