body {
    margin: 0;
    font-family: sans-serif;
    background: #0b1220;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.box {
    background: #111a2e;
    padding: 30px;
    border-radius: 15px;
    width: 300px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

input {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border-radius: 8px;
    border: none;
    background: #0f1a30;
    color: white;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: #4f8cff;
    color: white;
    cursor: pointer;
    margin-top: 10px;
}

button:hover { opacity: 0.8; }

.link {
    color: #6aa6ff;
    cursor: pointer;
    font-size: 13px;
    margin-top: 10px;
    display: block;
}

.hidden { display: none; }

@media (max-width: 480px) {
    body { padding: 16px; }
    .box { width: 100%; padding: 24px 20px; }
    input { font-size: 16px; padding: 12px; }
    button { font-size: 16px; padding: 12px; }
}