body {
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-box {
    width: 420px;
    max-width: calc(100% - 30px);
    background: rgba(10, 15, 25, 0.88);
    border: 1px solid rgba(255,255,255,0.16);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 0 40px rgba(0,0,0,0.65);
}

.auth-box h1 {
    margin-top: 0;
    text-align: center;
}

.auth-box label {
    display: block;
    margin-top: 16px;
    margin-bottom: 6px;
    color: #cfd8e3;
}

.auth-box input {
    width: 100%;
    padding: 13px;
    border-radius: 8px;
    border: 1px solid #384355;
    background: #111827;
    color: white;
    font-size: 15px;
}

.auth-box button {
    width: 100%;
    margin-top: 24px;
    padding: 14px;
    border: 0;
    border-radius: 8px;
    background: linear-gradient(135deg, #28a745, #1f7a34);
    color: white;
    font-size: 16px;
    font-weight: bold;
}

.auth-box button:hover {
    filter: brightness(1.1);
}

@media (max-width: 600px) {
    body {
        align-items: flex-start;
        padding: 30px 15px;
    }

    .auth-box {
        width: 100%;
        max-width: none;
        padding: 24px 20px;
    }

    .auth-box h1 {
        font-size: 30px;
    }

    .auth-box input,
    .auth-box button {
        font-size: 16px;
    }
}