body {
    background: url('/img/castle.png') no-repeat center center fixed;
    background-size: cover;
    font-family: 'Press Start 2P', cursive;
    display: flex;
    justify-content: center;
    align-items: center;

    color: #fff;
}

.admin-box {
    background: rgba(0, 0, 0, 0.7);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    width: 320px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    margin-top: 5%;
}

.admin-box h1 {
    margin-bottom: 30px;
    color: #f1c40f;
}

.admin-box input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    font-family: 'Press Start 2P';
    border-radius: 8px;
    border: none;
    outline: none;
}

.admin-box .btn {
    display: inline-block;
    padding: 10px 20px;
    margin-top: 15px;
    background: #8e44ad;
    color: #fff;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    font-family: 'Press Start 2P';
}

.admin-box .btn:hover {
    background: #a55eea;
}

.admin-box p {
    margin-top: 15px;
    font-size: 0.7rem;
    color: #ccc;
}

.error-msg {
    margin-top: 10px;
    color: #ff4c4c;
    font-size: 0.8rem;
    display: block;
}

@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    50% {
        transform: translateX(5px);
    }

    75% {
        transform: translateX(-5px);
    }

    100% {
        transform: translateX(0);
    }
}

.btn.shake {
    animation: shake 0.5s;
}