/* --------------------------------------------------
        Allgemeine Grundeinstellungen                              
 ----------------------------------------------------*/
html {
   box-sizing: border-box;
   font-family: Verdana;
   font-weight: 500;
}

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

body {
  font-size: 0.8rem;
  line-height: 150%;
}

h1, h2, h3, h4, h5, h6 {
  font-family: courier; 
}

h1 { 
  font-size: 1.2rem;
  padding-bottom: 0.2em;
  border-bottom: 2px solid black;
}

h2 {
  font-size: 1.0rem;
  padding-bottom: 0.2em;
  border-bottom: 2px solid black;  
}

h3 { 
  font-size: 0.9rem; 
}

ul {
  padding: 0;
}

.wrapper {
   background-color: #e1e8f0;
}

/* ------------------------------------------------------------------
     CSS-Eigenschaften für  mobile Geräte (kleiner als 640 px)            
       + Alles in einer Spalte untereinander anordnen                                              
-------------------------------------------------------------------- */
.header {
   text-align: center;
   padding: 1em;
   background-color: white;
   color: white;
}

.aside {
	display: table-cell;
	padding: 0 1em;
}

.footer {
   padding: 1em;
   text-align: center; 
   background-color: #e62739;
   color: white;
   border-top: 1px solid black;
   display: block;
}

nav {
	background-color: #0080C0;
	font-family: courier;
	font-size: 135%;
	font-weight: bold;
	color: white;
	border-top: 1px solid black;
	border-bottom: 1px solid black;
}

.nav-ul {
   /*background-color: #ff383f;*/ /* Watermelon */
   margin:0;
}
.nav-li {
   list-style: none;
   margin-left: 0;
   border-bottom: 1px solid black;
}
.nav-li-a {
    padding: 0.6em 2rem;
    display: block;
}
.nav-ul a:link {
    text-decoration: none; 
}
.nav-ul a:link, .nav-ul a:visited {
   color: #fff; /* white */
}
.nav-ul a:hover, .nav-ul a:focus, .nav-ul a:active {
   background-color: #FF5F00; 
   color: #efefef; /* Neutral */
}
.nav-active {
   color: #fff; /* white */
   background-color: green; 
}

.container {
   background-color: #fff; /* weiss */
}

.article {
  display: table-cell;
  padding: 0 1em;
}

.article_half {
  padding: 0 1rem 0 1rem; 
  clear: both;
}

img {
    max-width: 50%;
    height: auto;
}

img.alignleft {
    float: left;
    margin-right: 15px;
    margin-bottom: 8px;
}
img.alignright {
    float: right;
    margin-left: 15px;
    margin-bottom: 8px;
}
img.fullwidth {
    max-width: 100%;
    height: auto;
}

figure {
    width: 50%;
    text-align: center;
    font-style: italic;
    font-size: smaller;
    text-indent: 0;
    border: thin silver solid;
    margin: 0.5em;
    padding: 0.5em;
}

figure img {
    max-width: 100%;
}

figure.figure_left {
    float: left;
}
figure.figure_right {
    float: right;
}
figure.figure_fullsize {
    width: 100%;
}
img.img_scaled {
    width: 100%;
}
figcaption {
    background-color: lightgray;
}

article a{ 
    text-decoration: none;
	color: blue;
	border-bottom: 1px solid blue;
}

article a:hover{ 
    text-decoration: none;
	color: purple;
	border-bottom: 4px solid purple;
}
.row { clear: both; }

#up {
  position: fixed;
  bottom: 80px;
  right: 10px;
  padding: 1em;
  border: darkgrey 2px solid;
  background-color: rgba(225,232,240, 0.8);
  box-shadow: 2px 2px 1px 1px gray;
  text-decoration: none;
  color: black;
  text-align: center;
}

#up:hover, #up:focus {
  bottom: 5.5rem;
  background-color: #6ed3cf;
  transition: all 0.2s ease-out;
}

.div_footer {
    width: 95%;
    font-size: 1rem;
    padding: 0.2em;
}

a.footer-nav:link,
a.footer-nav:visited {
    color: #fff;
}
a.footer-nav:hover,
a.footer-nav:focus {
    color: #000;
    transition: all 0.2s ease-out;
}
a.header-nav {
    text-decoration: none;
	color: #000;
}
a.header-nav:link,
a.header-nav:visited {
    color: #000;
}
a.header-nav:hover,
a.header-nav:focus {
    color: #fff;
    transition: all 0.2s ease-out;
}
a.header-nav {
    text-decoration: none;
	color: #000;
}
.ul-book {
  padding-left: 2em;
  list-style: none;
}


/*-----------------------------------------------------   
     Tabletversion ab 640 Pixel                          
       640px / 16px/em = 40em  
       + 2 Spalten
         - Header und Navigation oben untereinander
		 - Hautpinhalt und Seitenleiste nebeneinander
		 - Fußleiste unten
------------------------------------------------------*/

@media screen and (min-width: 40em) {

  .header {
    text-align: center; 
	display: flex;
    flex-direction: row;
	align-items: center;
  }

  .div_header {
      width: 50%;
  }

  .header_left {
	  text-align: left;
  }

  .header_right {
	  text-align: right;
  }

  .container {
    display: block;
    overflow: auto; 
  }

  .nav-ul {
    padding: 0 2rem;
    overflow: hidden;	
  }
  .nav-li {
      float: left;
      display: inline-block;
      border: none;
      width: auto; 
   }
  .nav-li-a {
     padding: 0.7em 1.2rem;
     display: inline-block;
    }
	nav {
	  max-height: 25rem;
	  display: block;
	}
	.menubutton { display: none; }
    .footer {
       padding: 1em;
       text-align: center; 
       background-color: green;
       color: white;
       border-top: 1px solid black;
       clear: both;
       display: flex;
       flex-direction: row;
       align-items: center;
    }
    .div_footer {
        width: 33.33%;
        font-size: 1rem;
        padding: 0.2em;
    }
} 
/*------------------------------------------------------------------
    Bildschirme ab 1024 Pixel                         
      1024px / 16px/em = 64em
      + 3 Spalten
        - Header oben
        - Navigation, Hauptinhalt und Seitenleisten nebeneinander
        - Fußleiste unten		
 ------------------------------------------------------------------- */

@media screen and (min-width: 64em) {
	.article_half {
	  display: block;
      width: 50%;
      float:left;
	  clear: none;
	}

}	    

/*------------------------------------------------------------------- 
    Große Bildschirme (>1280 Pixel) 
      1280px / 16px/em = 70em
	    + 3 Spalten
          - Header oben
          - Navigation, Hauptinhalt und Seitenleisten nebeneinander
			* Zwei Artikel im Hauptinhalt nebeneinander
          - Fußleiste unten	
  -------------------------------------------------------------------- */

@media screen and (min-width: 70em) {
	.wrapper {
		margin: 0 auto;
		max-width: 70em;
	}
}