/* Custom page CSS
-------------------------------------------------- */
/* Not required for template or sticky footer method. */

main > .container {
    padding: 60px 15px 0;
}

.bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
}

@media (min-width: 768px) {
    .bd-placeholder-img-lg {
        font-size: 3.5rem;
    }
}

.b-example-divider {
    height: 3rem;
    background-color: rgba(0, 0, 0, .1);
    border: solid rgba(0, 0, 0, .15);
    border-width: 1px 0;
    box-shadow: inset 0 .5em 1.5em rgba(0, 0, 0, .1), inset 0 .125em .5em rgba(0, 0, 0, .15);
}

.b-example-vr {
    flex-shrink: 0;
    width: 1.5rem;
    height: 100vh;
}

.bi {
    vertical-align: -.125em;
    fill: currentColor;
}

.nav-scroller {
    position: relative;
    z-index: 2;
    height: 2.75rem;
    overflow-y: hidden;
}

.nav-scroller .nav {
    display: flex;
    flex-wrap: nowrap;
    padding-bottom: 1rem;
    margin-top: -1px;
    overflow-x: auto;
    text-align: center;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
}

/* --- Asteroids --- */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
}

@keyframes fadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fadeOut {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

.fade-in {
    animation: fadeIn 4s forwards;
}

.fade-out {
    animation: fadeOut 4s forwards;
}

/* Arrow animation */
.arrow {
    position: absolute;
    top: 15px;
    right: 200px;
    display: none;
    font-size: 2rem;
    z-index: 9999;
    white-space: nowrap;
    color: white;
}

.arrow::after {
    content: "⇨";
}

@keyframes glowing {
    0% {
        text-shadow: 0 0 5px #0000ff, 0 0 10px #0000ff, 0 0 15px #0000ff, 0 0 20px #0000ff;
    }
    50% {
        text-shadow: 0 0 10px #0000ff, 0 0 20px #0000ff, 0 0 30px #0000ff, 0 0 40px #0000ff;
    }
    100% {
        text-shadow: 0 0 5px #0000ff, 0 0 10px #0000ff, 0 0 15px #0000ff, 0 0 20px #0000ff;
    }
}

.arrow.glow {
    animation: glowing 1s infinite alternate;
}