body {
    background: #0b0f1a;
    color: white;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    backdrop-filter: blur(10px);
}

button {
    background: #007bff;
    border: none;
    padding: 12px 20px;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
}

.popup {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
}

.hidden {
    display: none;
}

.popup-content {
    background: #111;
    padding: 30px;
    border-radius: 10px;
    width: 300px;
    text-align: center;
}

.popup-content input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}

.close {
    margin-top: 10px;
    background: #444;
}