:root {
--primary: #ffffff;
--bg: #000000;
--text-primary: #ffffff;
--text-dark: #2a2a2a;
--buttton-primary: #ffffff;
--rocket: #d2632e;
--moon: #beb88d;

--btn-bg-1: #fdfe40;
--btn-bg-2: #d2632e;
--btn-bg-3: #ffffff;
--btn-bg-4: #0a93d9;
--btn-bg-5: #5cadd3;
}

html {
    font-family: 'Open Sans', sans-serif;
}
.page {
    background: var(--bg) url(./bg.jpg) top center no-repeat;
    background-size: cover;
    color: var(--text-primary);
}
.content {
    max-width: 960px;
    margin: 0 auto;
}
.space {
    padding: 3em 0;
}
.space__moon {
    position: relative;
    max-width: 50vmax;
    /* animation: rotation 30s linear infinite; */
}
 /* pro případnou rotaci měsíce 
 @keyframes rotation {
    0% {
        transform: rotate(0);
    }
    100% {
        transform: rotate(360deg);
    }
}
*/
.space__moon::after {
    content: "";
    width: 200px;
    height: 200px;
    display: block;
    background-image: url("./rocket.png");
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
    position: absolute;
    top: 0;
    right: 0;
    transform: translate(85%, 0);
}
.moon {
    position: relative;
    border-radius: 50%;
    overflow: hidden;
    filter: drop-shadow(2px 3px 3em var(--primary));
    box-shadow: 0 0 0 0 rgba(255, 255, 255, 1);
	transform: scale(1);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7);
    }
      
    70% {
        box-shadow: 0 0 0 2em rgba(255, 255, 255, 0);
    }
      
    100% {
        box-shadow: 0 0 0 0 rgba(255, 255, 255, 0);
    }
}
.moon::before {
    content: "";
    width: 100%;
    height: 100%;
    background-color: rgb(0, 0, 0);
    position: absolute;
    top: 0;
    border-radius: 50%;
    animation: moon-move linear 32s infinite alternate;
    transform-origin: center center;
    filter: blur(2px);
}
@keyframes moon-move { 
    from {
        transform: translateX(110%);
    }
    to {
        transform: translateX(-110%);
    }
}
/* Alternativa k posunu měsíce (namísto hodnoty alternate v .moon::before)
@keyframes moon-move {
    0% {
     transform: translateX(110%);
    }
    50% {
     transform: translateX(-110%);
    }
    100% {
     transform: translateX(110%);
    }
 }
*/
.space__astronaut {
    position: absolute;
    top: 35%;
    right: 25%;
    max-width: 180px;
    animation-name: astronaut-move;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-duration: 10s;
}
@keyframes astronaut-move {
    0% {
        top: 35%;
        right: 25%;
    }
    25% {
        top: 33%;
        right: 27%;
    }
    50% {
        top: 34%;
        right: 26%;
    }
    75% {
        top: 33%;
        right: 27%;
    }
    100% {
        top: 35%;
        right: 25%;
    }
}
.content-description {
    text-align: center;
    margin-bottom: 2em;
}
.page__title {
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translate(-50%, -10%);
    font-size: 6rem;
    text-align: center;
    color: var(--moon);
    margin: 0;
    z-index: 2;
}
.page__title > span {
    display: block;
    font-size: 1rem;
    font-weight: normal;
    text-transform: uppercase;
}

/* Global */
.img-responsive {
    display: block;
    width: 100%;
}
/* Components */
.button {
    display: inline-block;
    padding: 0.75em 2em;
    margin-top: 1em;
    color: var(--text-primary);
    background-color: var(--buttton-primary);
    font-weight: bold;
    text-transform: uppercase;
    text-decoration: none;
}
.button:hover {
    text-decoration: underline;
}

.button--border-animation {
    padding: 3px;
    border-radius: 3px;
    display: inline-block;
    background-image: linear-gradient(115deg, var(--btn-bg-1), var(--btn-bg-2), var(--btn-bg-3), var(--btn-bg-4), var(--btn-bg-5), var(--btn-bg-2), var(--btn-bg-1));
    background-size: 200% 100%;
    background-position: 0% center;
    animation: colored-border 0.75s linear paused infinite;
}
.button--border-animation > span {
    display: inline-block;
    padding: 1em 1.5em;
    background-color: var(--bg);
}
.button--border-animation:hover {
    animation-play-state: running;
}
@keyframes colored-border {
    from {
        background-position-x: 0%;
    }
    to {
        background-position-x: 200%;
    }
}