body {
    background: linear-gradient(135deg, #7F3FF0, #3C8CFF);
    background-size: cover;
    position: relative;
    overflow-x: hidden;
    overflow-y: auto;
    min-height: 100vh;
}

body::before {
    content: "";
    position: fixed;
    top: -50px;
    left: -50px;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(45deg);
    border-radius: 10px;
    z-index: 0;
}

body::after {
    content: "";
    position: fixed;
    bottom: -80px;
    right: -80px;
    width: 250px;
    height: 250px;
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(-25deg);
    border-radius: 10px;
    z-index: 0;
}

header {
    position: relative;
    z-index: 10 !important;
}

.btn-dark {
    position: relative;
    z-index: 10;
    cursor: pointer !important;
    transition: transform 0.15s ease, box-shadow 0.15s ease !important;
    box-shadow: 0 6px 0 #0b0b0b !important;
}

.btn-dark:hover {
    transform: translateY(4px) !important;
    box-shadow: 0 2px 0 #300c63 !important;
}

.btn-dark:active {
    transform: translateY(6px) !important;
    box-shadow: 0 0 0 #300c63 !important;
}

.form-control::placeholder {
    opacity: 0.6 !important;
}

.fade-out {
    animation: fadeOut 0.8s forwards;
}

/* Para Chrome, Safari, Edge y Opera */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

.alerta {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 15px 20px;
    font-size: 16px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    transition: opacity 0.8s ease-out;
    z-index: 1000;
}

.alerta i {
    font-size: 20px;
    flex-shrink: 0;
    padding: 0 !important;
    margin-right: 8px;
}

.alerta span {
    display: inline-block;
}

.logo {
    width: 100%;
    max-width: 200px;
}

main {
    position: relative;
    z-index: 1;
    margin-top: -80px;
}

@media (max-width: 576px) {
    .alerta {
        font-size: 13px;
        padding: 12px 10px;
    }

    .alerta i {
        font-size: 16px;
        margin-right: 6px;
    }
}

@media (max-width: 400px) {
    .alerta {
        font-size: 12px;
        padding: 10px 8px;
    }
}


.container-body .card-lobby {
    background: #ffffff;
    padding: 30px;
    border-radius: 18px;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.20);
    animation: fadeIn .6s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card-lobby label {
    font-weight: 600;
    color: #333;
    font-size: 15px;
}

.card-lobby .form-control {
    border-radius: 10px;
    padding: 10px 12px;
    border: 1px solid #ccc;
    transition:git  0.2s;
}

.card-lobby .form-control:focus {
    border-color: #6A11CB;
    box-shadow: 0 0 6px rgba(106, 17, 203, 0.4);
}

.card-lobby .btn-dark {
    background: #000;
    border-radius: 50px;
    padding: 12px;
    font-weight: 600;
    transition: 0.3s;
}

.card-lobby .btn-dark:hover {
    background: #333;
}

.card-lobby .btn-danger {
    border-radius: 50px;
    padding: 12px;
    font-weight: 600;
}