@import url("https://fonts.googleapis.com/css?family=DM+Sans:400,700&display=swap");
:root {
    --duration: .8s;
    --half-duraiton: calc( var(--duration) / 2 );
    --ease: cubic-bezier(.7, 0, .3, 1);
     --text: #ffffff;
}

*, *:before, *:after {
    box-sizing: border-box;
    position: relative;
}

html, body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
}

body {
    background: black;
    color: white;
    font-family: "DM Sans", sans-serif;
}

img {
    max-width: 100%;
}

#app {
    height: 100%;
    width: 100%;
    display: grid;
    grid-template-columns: none;
    grid-template-rows: 1fr 1fr;
}

.planet {
    grid-column: 1;
    grid-row: 1/-1;
    overflow: hidden;
    height: 100%;
    width: 100%;
    display: grid;
    grid-template-columns: 10% 40% 40% 10%;
    grid-template-rows: 10% 1fr 1fr;
    grid-template-areas: "header header header header" "x title details y" "x planet photos photos";
    bottom: 0;
}
.planet > .planet-title {
    display: block;
    grid-area: title;
}
.planet > .planet-figure {
    grid-column: 1/-1;
    grid-row: planet;
    padding: 0;
    margin: 0 auto;
    position: relative;
}
.planet > .planet-figure img {
    margin-bottom: -50%;
}
.planet > .planet-figure::after {
    content: "";
    position: fixed;
    bottom: 0%;
    top: 0%;
    width: 100%;
    left: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, transparent 30%);
    z-index: 2;
}
.planet > .planet-details {
    grid-area: details;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

.detail {
    font-size: 5vmin;
    width: 3em;
    font-weight: 400;
    display: flex;
    margin-left: 0.4em;
    flex-shrink: 0;
    align-self: start;
}
.detail:after {
    content: attr(data-postfix);
}
.detail:before {
    display: block;
    position: absolute;
    top: 100%;
    margin-top: 1rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    opacity: 0.6;
    letter-spacing: 1px;
}
.detail[data-detail=hours]:before {
    content: "Hours";
}
.detail[data-detail=gravity]:before {
    content: "gravity";
}
.detail[data-detail=tilt]:before {
    content: "tilt";
}

h1, h2 {
    margin: 0;
}

h2{
    font-size: 2em;
}

/* ---------------------------------- */
.planet {
    visibility: hidden;
    transition: visibility 0.01s linear var(--duration);
    /* ---------------------------------- */
    /* ---------------------------------- */
    /* ---------------------------------- */
}
.planet[data-active] {
    visibility: visible;
    opacity: 1;
    transition-delay: 0s;
}
.planet .planet-title .word {
    overflow: hidden;
}
.planet .planet-title .char {
    transform: translateY(100%);
    transition: transform var(--duration) var(--ease);
    transition-delay: calc( var(--char-index) * .1s );
}
.planet[data-active] .planet-title .char {
    transform: translateY(0%);
    transition-delay: calc( (var(--duration)/2) + (var(--char-index) * .1s) );
}
.planet .planet-description {
    visibility: hidden;
    opacity: 0;
    transform: translateY(1em);
    transition: transform var(--duration) var(--ease), opacity var(--duration) linear, visibility 0.01s linear var(--duration);
}
.planet[data-active] .planet-description {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    transition-delay: var(--duration), var(--duration), 0s;
}
.planet .planet-details {
    visibility: hidden;
}
.planet[data-active] .planet-details {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    transition-delay: 0s;
}
.planet .planet-figure {
    opacity: 0;
    transition: opacity var(--duration) var(--ease);
}
.planet[data-active] .planet-figure {
    opacity: 1;
}

/* ---------------------------------- */
#app {
    overflow: hidden;
}

.planet-nav {
    grid-column: 1;
    grid-row: 2;
    pointer-events: none;
    z-index: 10;
    display: flex;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
}
.planet-nav svg {
    display: block;
    width: auto;
    height: auto;
    min-width: 100%;
    max-width: none;
    min-height: 100vh;
    margin-bottom: -50%;
}
@media screen and(max-width: 600px) {
    .planet-nav svg {
        margin-bottom: -55%;
    }
}

.planet-nav tspan {
    cursor: pointer;
    fill: #FFF;
    pointer-events: auto;
    opacity: 0;
    transition: opacity var(--duration) linear;
}
.planet-nav tspan[x] {
    opacity: 0.6;
}
.planet-nav tspan:hover, .planet-nav tspan:focus {
    opacity: 1;
}
.planet-nav tspan.active {
    fill: #ffffff;
    opacity: 1;
    font-weight: bold;
    filter: drop-shadow(0 0 0 rgba(255, 255, 255, 0.8));
}
.planet-nav svg {
    transform-origin: center center;
    --length: 7;
    --range: 160deg;
    transform: rotate(calc( (var(--active,0) / var(--length)) * (-1 * var(--range)) + (var(--range) / 2) ));
    transition: transform var(--duration) var(--ease);
}

/*header*/


header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1em 2em;
    z-index: 1000;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

a {
    text-decoration: none;
    color: var(--text);
}

#left-logo-container .brand {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--text);
}

#link-nav-container {
    display: flex;
}

#link-nav-container a {
    margin: 0 1em;
    font-size: 1em;
    position: relative;
    color: var(--text);
    transition: color 0.3s;
}

#link-nav-container a::before {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--text);
    transition: width 0.3s ease-in-out, right 0.3s ease-in-out;
}

#link-nav-container a:hover {
    color: #fff;
}

#link-nav-container a:hover::before {
    width: 100%;
    left: 0;
}


#account-container {
    display: flex;
    align-items: center;
}

#account-container svg {
    display: flex;
    align-content: center;
}


#viewport-hero {
    background-color: #222;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3em 2em 1em 2em;
    height: 100vh;
    min-height: 30em;
    background-color: rgba(34, 34, 34, 0.7);
    position: relative;
}

#viewport-hero::before {
    content: "";
    background: rgba(0, 0, 0, .3);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(50%);
    transition: 0.2s;
}

#viewport-hero .text {
    max-width: 700px;
    color: var(--text);
    position: relative;
    text-align: center;
    z-index: 2;
}

#viewport-hero h1 {
    font-size: 3em;
    margin-bottom: 0.3em;
}

#viewport-hero p {
    font-size: 1.1em;
    line-height: 30px;
}

.btn {
    font-size: 1.1em;
    display: inline-block;
    text-decoration: none;
    margin: 2em 1em;
    padding: 0.8em 1.5em;
    border-radius: 3em;
    background: transparent;
    color: var(--text);
    border: 2px solid white;
    transition: 0.3s;
}

.btn:hover {
    background: var(--text);
    color: var(--black);
}


@media screen and (min-width: 900px) {
    .container > .brand {
        display: none;
    }
}

@media screen and (max-width: 900px) {
    #viewport-hero h1 {
        font-size: 2.5em;
    }
}

@media screen and (max-width: 700px) {
    #link-nav-container {
        display: none;
    }

    #burger-menu-icon {
        color: var(--text);
        display: block;
    }

    .burger-menu.open {
        display: block;
        transform: translateX(0);
    }
}