/* ====== Basic styles ====== */
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background-color: #1c1c1c;
  font-family: Roboto, Arial, sans-serif;
}

img {
  max-width: 100%;
}
p {
  margin: 0;
}
p + p {
  margin-top: 1.5em;
}

/* ====== Helper classes ====== */

/**
* Make the antialiasing on dark backgrounds a bit lighter
* on WebKit/Firefox OS X.
*/
.inverted {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrapper {
  width: 95%;
  max-width: 60em;
  margin: 0 auto;
}

.section {
  background-color: #ddd;
  padding-top: 4em;
  padding-bottom: 4em;
}
.section:after {
  content: '';
  display: table;
  clear: both;
  height: 0;
}

/* ====== Header styles ====== */

/**
* 1. SVG file containing JPEG image + a radial gradient mask, then a linear
*    gradient background.
*/
.page-header {
  background-color: #000;
  background-image: url(../img/earth.svg),
  linear-gradient(to bottom, #000, #102133); /* [1] */
  background-repeat: no-repeat;
  background-size: 100% auto, cover;
  background-position: 50% bottom;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 12em;
}

/**
* Masked header title.
* 1. Use the -webkit-prefixed properties to create a CSS radial gradient mask.
*    These are not supported unprefixed when writing this.
* 2. Size the mask to twice the size. Positioning won't work as the transparent
*    background created by simply moving it will mask out the top of the text.
*/
.header-title {
  color: #fff;
  text-align: center;
  font-family: Roboto Condensed, Roboto, arial, sans-serif;
  font-size: 6em;
  font-size: 10vw;
  text-transform: uppercase;
  -webkit-mask-image: radial-gradient(
    ellipse 90% 30% at 50% 50%,
    rgba(0,0,0,0) 45%, #000 70%
    ); /* [1] */
  -webkit-mask-size: 100% 200%; /* [2] */
  margin: auto auto 8%;
}

@media only screen and (min-width: 60em) {
  .page-header {
    background-size: 60em auto, cover;
    min-height: 20em;
  }
  .header-title {
    font-size: 160px;
    margin-bottom: 60px;
  }
}

.section-title {
  font-family: Roboto Condensed, Roboto, Arial, sans-serif;
  text-transform: uppercase;
  -webkit-transform-origin: left center;
  transform-origin: left center;
  -webkit-transform: skewY(-2deg);
  transform: skewY(-2deg);
  -webkit-transform: perspective(200px) rotate3d(2,-1,0,-30deg);
  transform: perspective(200px) rotate3d(2,-1,0,-30deg);
  font-size: 4em;
  margin: 0 0 1em;
}

.section-text {
  font-size: 1.125em;
}
.fig {
  margin: 0 auto;
}
@media only screen and (min-width: 600px) {
  .fig {
    margin: 0;
    float: right;
  }
  .stacked:nth-of-type(even) .fig {
    float: left;
    margin-right: 4em;
  }
}

.stacked:nth-of-type(even) .section-text {
  overflow: hidden;
}

.section-universe {
  position: relative;
  overflow: hidden;
  background-color: #fff !important;
}

.section-sun {
  background-color: #D8F4FD;
}

.section-sun .section-title {
  color: #1C6E88;
}

.section-moon {
  background-color: #000;
  color: #fff;
}

/* ===== Figures and images ====== */

/**
* Switch to the following rule to use the margin reference box 
* as a shape instead:
*/

/*.fig-moon {
  max-width: 40%;
  border-radius: 50%;
  -webkit-shape-outside: margin-box;
          shape-outside: margin-box;
  margin-left: 2em;
}*/
.fig-moon {
  max-width: 40%;
  -webkit-shape-outside: circle();
  shape-outside: circle();
  margin: 2em;
}
/**
* 1. Use the image as the shape – the transparent edges will generate it.
* 2. Uncomment this line to use a polygon instead.
* 3. Use a shape threshold (if using the image) to set the tolerance level
*    before the shape is generated.
* 4. Set a margin on the generated shape.
* 5. Add a blend mode to make the image fit in with the background better.
*/
.fig-planet {
  max-width: 65%;
  -webkit-shape-outside: url(../img/saturn.png); /* [1] */
  shape-outside: url(../img/saturn.png); /* [1] */
  /*shape-outside: polygon(41.85% 100%, 22.75% 92.85%, 5.6% 73.3%, 0.95% 52.6%, 5.6% 35.05%, 21.45% 17.15%, 37.65% 12.35%, 40% 0, 100% 0%, 100% 100%);*/ /* [2] */
  -webkit-shape-image-threshold: 0.4; /* [3] */
  shape-image-threshold: 0.4; /* [3] */
  -webkit-shape-margin: 1em; /* [4] */
  shape-margin: 1em; /* [4] */
  mix-blend-mode: screen; /* [5] */
}

.fig-sun {
  max-width: 40%;
}

/**
* The image of the Sun uses both masking and filters to go from a black-and-white
* image to a colorized version with transparency. See full-example.html for the 
* SVG mask version.
* 1. Add a list of filters to colorize the image.
* 2. Mask away the background using a radial gradient.
*/
.fig-sun {
  -webkit-filter: contrast(0.34) brightness(1.6) sepia(1) hue-rotate(10deg); /* [1] */
  filter: contrast(0.34) brightness(1.6) sepia(1) hue-rotate(10deg); /* [1] */
  -webkit-mask-image: radial-gradient(circle closest-side at 50%, #000, #000 90%, rgba(0,0,0,0) 93%); /* [2] */
}
.fig-universe {
  width: 100%;
  display: block;
  float: none;
}

.section-text p {
  line-height: 1.5;
  max-width: 40em;
}

/* ====== Navigation ====== */

/**
* 1. Add a transform to the parent section, to counter a bug in Blink
*    where the filter on child items freak out otherwise.
*/
.nav-section {
  background-color: #16284F;
  color: #fff;
  transform: translate(0,0); /* [1] */
}
.nav-section ul {
  list-style: none;
  padding: 0;
}
/**
* Some tiny responsive tweaks to make the menu
* fall back to a simpler appearance on very small screens:
*/
@media only screen and (max-width: 599px) {
  .nav-section li {
    margin-bottom: .25em;
  }
  .nav-section a {
    padding: .5em;
  }
}
/* we also scope the enhanced version to a media query: */
@media only screen and (min-width: 600px) {
  .nav-section ul {
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
  }

  /**
  * 1. Add a drop-shadow filter (including the -webkit-prefix) to the list-items.
  */

  .nav-section li {
    height: 6.25em;
    width: 6.25em;
    float: left;
    -webkit-flex:  none;
    -ms-flex:  none;
    flex:  none;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-align-items: stretch;
    -ms-flex-align: stretch;
    align-items: stretch;
    -webkit-filter: drop-shadow(0 0 .5em rgba(0,0,0,0.3)); /* [1] */
    filter: drop-shadow(0 0 .5em rgba(0,0,0,0.3)); /* [1] */
  }
}

/**
* Uncomment animation code to view the "focus" animation.
* Sadly, this has some very serious rendering bugs at the moment when
* combined with clip-paths.
*/

/*.nav-section li {
    animation: inFocus 1s both;
}
.nav-section li:nth-child(2) {
    animation-delay: .25s;
}
.nav-section li:nth-child(3) {
    animation-delay: .50s;
}
.nav-section li:nth-child(4) {
    animation-delay: .75s;
}
.nav-section li:nth-child(5) {
    animation-delay: 1s;
}
*/
/**
* 1. Change the shadow color on hover, to create the glow.
*/
.nav-section li:hover {
  -webkit-filter: drop-shadow(0 0 .5em rgba(50,50,255,0.2)); /* [1] */
  filter: drop-shadow(0 0 .5em rgba(50,50,255,0.2)); /* [1] */
}

/**
* 1. Add a null transform to prevent rendering bugs in Blink/WebKit. This still
*    freaks out in Safari, but seemingly only intermittently.
*/
.nav-section a {
  background-color: #1A4298;
  color: #fff;
  text-decoration: none;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: -webkit-box;
  display: -moz-box;
  display: flex;
  -webkit-align-items: center;
       -ms-flex-align: center;
    -webkit-box-align: center;
       -moz-box-align: center;
          align-items: center;
  width: 100%;
  -webkit-justify-content: center;
            -ms-flex-pack: center;
         -webkit-box-pack: center;
            -moz-box-pack: center;
          justify-content: center;
  -webkit-transform: translate(0, 0);
     -moz-transform: translate(0, 0);
      -ms-transform: translate(0, 0);
       -o-transform: translate(0, 0);
          transform: translate(0, 0); /* [1] */
}
.nav-section a:focus,
.nav-section a:hover,
.nav-section a:active {
  outline: none;
  background-color: #1F51BC;
}

.section-planets {
  color: #E0CBD9;
  background-color: #26122B;
}

/**
* 1. Colorize the Milky Way background using luminosity blend mode.
*/
.section-milkyway {
  background-image: url(../img/milkyway.jpg);
  background-color: #202D53;
  background-blend-mode: luminosity; /* [1] */
  background-position: 50% 0;
  background-size: cover;
  color: #fff;
}
/**
* 1. Add a backdrop blur to the semi-transparent text background.
*    Falls back to just the normal alpha transparency.
*/
.section-milkyway .section-text {
  margin-top: 30vh;
  color: #fff;
  padding: 1em;
  -webkit-backdrop-filter: blur(5px); /* [1] */
          backdrop-filter: blur(5px); /* [1] */
  background-color: #202D53;
  background-color: rgba(0,0,0,0.5);
}

.page-footer {
  background-color: #222B33;
  color: #eee;
}
.page-footer a {
  color: inherit;
}

.universe-header {
  position: relative;
}

@media only screen and (min-width: 800px) {
  .universe-header {
    width: 40%;
    float: right;
    margin: .2em 0 .5em 2em;
    position: relative;
  }
  .section-universe .section-text {
    margin-right: 25%;
  }
  .section-milkyway .section-text {
    margin-left: 25%;
  }
}
@media only screen and (min-width: 1100px) {
  .universe-header {
    width: 55%;
  }
}

.section-universe {
  padding-top: 8em;
  padding-bottom: 8em;
}



:root .universe-title {
  margin: 0;
  width: 90%;
  height: 0;
  padding-bottom: 27%;
  position: absolute;
  left: 5%;
  right: 5%;
  top: 54%;
  font-family: 'Roboto Condensed', 'Roboto', sans-serif;
}

.universe-title text {
  fill: #602135;
  text-transform: uppercase;
}
.universe-title svg {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: #fff;
}

@supports (mix-blend-mode: screen) {
    /**
    * 1. Only add the mix-blend-mode rules if supported. Screen makes black
    *    100% transparent.
    * 2. Change the fill color to black for supporting browsers,
    *    resulting in 100% transparency for the text.
    */
    .universe-title {
      mix-blend-mode: screen;
    }
    .universe-title text {
      fill: #000;
    }
  }

  .universe-span-1 {
    font-size: 53.2px;
  }
  .universe-span-2 {
    font-size: 96.2px;
  }
/**
* 1. Clip the sections using clip-path and basic shape functions.
*/
.stacked {
  -webkit-clip-path: polygon(0 3vw, 100% 0, 100% calc(100% - 3vw), 0% 100%); /* [1] */
          clip-path: polygon(0 3vw, 100% 0, 100% calc(100% - 3vw), 0% 100%); /* [1] */
}
.page-header {
  -webkit-clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3vw), 0% 100%); /* [1] */
          clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3vw), 0% 100%); /* [1] */
}
.page-footer {
  -webkit-clip-path: polygon(0 3vw, 100% 0, 100% 100%, 0% 100%); /* [1] */
          clip-path: polygon(0 0, 100% 0, 100% 100%, 0% 100%); /* [1] */
}
/**
* 1. Adjust the negative margin-top for sections to pull them together,
*    but only if clip-paths are supported.
*/
@supports ((clip-path: polygon(0 0)) or 
   (-webkit-clip-path: polygon(0 0))) {
  .stacked {
    margin-bottom: -3.4vw; /* [1] */
  }
}

@-webkit-keyframes inFocus {
  from {
    -webkit-filter: blur(10px);
            filter: blur(10px);
  }
}
@keyframes inFocus {
  from {
    -webkit-filter: blur(10px);
            filter: blur(10px);
  }
}