:root {
  --logo-height: 32px;
  --logo-top: 0.5em;
  --logo-top-with-navigation: 3.5em;

  --navigation-burger-height: 58px;
  --navigation-top: 1em;
  --navigation-color: #63738f;

  --default-text-color: #e9e9e9;

  --box-border-width: 2px;
  --box-content-margin: 1em;

  --highlight-color: #FF9900; /* Stations-Orange */
  --secondary-highlight-color: #CCCC99;
  --link-color: #FF9900;
  
  --font-sans-serif: Helvetica, Arial, sans-serif;
  --font-monospace: lucida console, andale mono, courier new, monospace;

  --box-background: rgba(90, 122, 142, 0.3);
  --text-box-border: 1px solid #46b6ee30;
}

.debug {
  outline: 1px solid #f00;
}

html {
  box-sizing: border-box;
}

*, *:before, *:after {
  box-sizing: inherit;
}

html, body {
  line-height: 1.3;
  height: 100%;
}

body {
  color: var(--default-text-color);
  margin: 0;
  padding: 0;
  font-family: var(--font-sans-serif);
  background: url(../img/c-base_raumstation.gif) 50% calc(var(--navigation-burger-height) + var(--logo-top)) no-repeat, url(../img/stars_only.png) repeat, #020303;
  display: flex;
  flex-flow: column;
}

main {
  margin-top: calc(var(--logo-height) + 2em);
  flex-grow: 1;
}

footer {
  background-color: #5a7b8e;
  margin-top: 1.5em;
  padding: 1em 0;
}

footer ul {
  margin-bottom: 1em;
  list-style-image: url(../img/link_dark.gif);
}

footer a:link, footer a:visited {
  color: #0b1729;
  text-decoration: none;
}

footer a:hover, footer a:active {
  color: #122035;
  text-decoration: underline;
}

.container {
  margin-left: auto;
  margin-right: auto;
  max-width: 1200px;
  padding: 0 1em;
  width: 100%;
}

h1,h2,h3,h4,h5,h6 {
  color: var(--highlight-color);
  font-family: var(--font-monospace);
}

.highlight {
  color: var(--highlight-color);
}

.secondary {
  color: var(--secondary-highlight-color);
}

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

a:hover, a:active {
  color: var(--link-color);;
  text-decoration: underline;
}

a.button {
  font-family: var(--font-monospace);
  display: inline-block;
  padding: 0.5em 1.2em;
  color: var(--link-color);;
  background-color: #22374c;
  text-decoration: none;
  opacity: .9;
  border: 2px solid #46b6ee;
  margin: 0.3em;
}

a.button:link, a.button:visited {
  background-color: #22374c;
}

a.button:hover, a.button:active {
  opacity: 1;
  background-color: #0c1c2a;
}

a.button.full-width {
  display: block;
  text-align: center;
  margin-left: 0;
  margin-right: 0;
}

.bold {
  font-weight: bold;
}

.center {
  text-align: center;
}

.margin-right {
  margin-right: 1em;
}

.margin-bottom-extra {
  margin-bottom: 1.5em;
}

.box-padding {
  padding: 1em;
}

.row {
  display: flex;
  flex: 0 1 auto;
  flex-flow: row;
}

.row.wrap {
  flex-flow: row wrap;
}

.row.vertical-center {
  align-items: center;
}

.column-grow {
  flex-grow: 1;
}

.content-block + .content-block {
  margin-top: 2em;
}

.navigation {
  font-family: var(--font-monospace);
  text-align: right;
  width: 100%;
  color: var(--navigation-color);
}

.navigation ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.navigation li a {
  color: var(--navigation-color);
  display: block;
  padding: 1em;
  text-decoration: none;
}

.navigation li a:hover,
.navigation .menu-btn:hover {
  color: #9ba8bf;
  background-color: #111;
}

.navigation .menu {
  text-align: left;
  position: absolute;
  top: 0;
  left: 0;
  padding-top: 58px;
  width: 100%;
  background-color: #000;
  z-index: 100;
  display: none;
}

.navigation .menu-icon {
  cursor: pointer;
  display: inline-block;
  padding: 28px 20px;
  position: relative;
  user-select: none;
  background: #000;
  z-index: 101;
}

.navigation .menu-icon .navicon {
  background: var(--navigation-color);
  display: block;
  height: 2px;
  position: relative;
  transition: background .2s ease-out;
  width: 18px;
}

.navigation .menu-icon .navicon:before,
.navigation .menu-icon .navicon:after {
  background: var(--navigation-color);
  content: '';
  display: block;
  height: 100%;
  position: absolute;
  transition: all .2s ease-out;
  width: 100%;
}

.navigation .menu-icon .navicon:before {
  top: 5px;
}

.navigation .menu-icon .navicon:after {
  top: -5px;
}

.navigation .menu-button {
  display: none;
}

.navigation .menu-button:checked ~ .menu {
  display: block;
}

.navigation .menu-button:checked ~ .menu-icon .navicon {
  background: transparent;
}

.navigation .menu-button:checked ~ .menu-icon .navicon:before {
  transform: rotate(-45deg);
}

.navigation .menu-button:checked ~ .menu-icon .navicon:after {
  transform: rotate(45deg);
}

.navigation .menu-button:checked ~ .menu-icon:not(.steps) .navicon:before,
.navigation .menu-button:checked ~ .menu-icon:not(.steps) .navicon:after {
  top: 0;
}

@media screen and (min-width: 32em) {
  footer .container {
    display: flex;
    flex: 0 1 auto;
    flex-flow: row wrap;
    justify-content: center;
  }
  
  footer ul {
    margin: 0 2em 1em 2em;
  }
}

@media screen and (min-width: 64em) {
  body {
    background: url(../img/c-base_raumstation.gif) 50% var(--logo-top-with-navigation) no-repeat, url(../img/stars_only.png) repeat, #020303;
  }

  main {
    margin-top: calc(var(--logo-top-with-navigation) + var(--logo-height) - var(--navigation-top) - 1em /* navigation height */ + 2em /* margin */);
  }

  footer {
    margin-top: 0;
    min-height: 320px;
    background: url(../img/footer_stars.png) no-repeat, url(../img/footer_bg_uk.png) repeat-x, #020303;
    padding: 155px 0 1em 0;
  }

  .navigation {
    margin: 0 auto;
    max-width: 1200px;
    padding: 0 1em;
    width: 100%;
    margin-top: var(--navigation-top);
  }

  .navigation .menu-icon {
    display: none;
  }

  .navigation .menu {
    text-align: right;
    position: static;
    padding: 0;
    width: auto;
    background: none;
    display: block;
  }

  .navigation li {
    display: inline;
  }

  .navigation li a {
    display: inline;
    padding: 0;
    text-decoration: none;
  }

  .navigation li a:hover,
  .navigation .menu-btn:hover {
    color: #9ba8bf;
    background-color: #111;
    text-decoration: underline;
  }

  .navigation li + li::before {
    content: " | ";
  }

  .navigation a:hover, .navigation a:active {
    text-decoration: underline;
    color: #9ba8bf;
  }

  .navigation a:link, .navigation a:visited {
    text-decoration: none;
    color: var(--navigation-color);
  }
}

.modal {
  display: none;
}

.modal.is-open {
  display: block;
}

.dialog-overlay {
  position: fixed;
  z-index: 200;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2em;
}

.dialog {
  max-height: 100%;
  overflow: auto;
  background-color: #5A798E;
  border: 1px solid #46b6ee;
  padding: 0.2em;
}

.dialog header {
  background-color: #22374C;
  border: 1px solid #46b6ee;
  display: flex;
  align-items: center;
}

.dialog header h2 {
  font-size: 1em;
  font-weight: normal;
  color: #ff9900;
  margin: 0;
  padding: 0.5em 1em;
  flex-grow: 1;
}

.dialog header button {
  font-weight: bold;
  padding: 0.3em 0.5em;
  margin: 0.3em;
  color: #ff9900;
  background-color: #22374c;
  text-decoration: none;
  opacity: .9;
  border: 1px solid #46b6ee;
  border-radius: 3px;
  cursor: pointer;
  user-select: none;
}

.dialog header button:hover {
  background-color: #0c1c2a;
  opacity: 1;
}

.dialog header .close:hover {
  color: #FF9900;
}

.dialog .content {
  padding: 1em;
}

.info-box {
  padding: 1em;
  background-color: var(--box-background);
  border: var(--text-box-border);
}

.box-contents > :first-child {
  margin-top: 0;
}

.box-contents > :last-child {
  margin-bottom: 0;
}

a.external::before {
  content: '➝ ';
  color: var(--default-text-color);
}