* {
  box-sizing: border-box;
}

body {
  font-family: "Arial", Helvetica, sans-serif;
  margin: 0;
}

/* Header */
header {
  padding: 30px;
  text-align: center;
  background: #202020;
  color: white;
  min-height: 280px;
}

/* Top navigation bar */
.navbar {
  display: flex;
  background-color: #333;
  height: 60px;
  align-items: center;
  padding: 0 20px;
  position: sticky;
  top: 0;
  overflow: hidden;
}

.burger {
  font-size: 40px;
  cursor: pointer;
  color: white;
  margin-left: auto;
}
 
.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  right: 0;
  background-color: #333;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}

.content-wrapper_head {
  background-color: #202020;
  display: flex;
  min-height: auto;
}

.blende_head {
  width: 90px;
  background-color: #D2D2D2;
}

.main_head {
  flex: 70%;
  background-color: #202020;
  text-align: center;
  padding: 20px;
}

/* Column container */
.container_head {  
  display: flex;
  flex-wrap: wrap;
  background: #202020;
}

/* Column container */
.container {  
  display: flex;
  flex-wrap: wrap;
}

/* Sidebar/left column */
.side {
  flex: 30%;
  background-color: #f1f1f1;
  padding: 20px;
  text-align: center;
}

.content-wrapper {
  display: flex;
  min-height: 500px;
}

/* Nur dekorative Seitenflächen */
.blende {
  width: 90px;
  background: #f1f1f1;
}

/* Main column */
.main {
  flex: 70%;
  background-color: white;
  padding: 20px;
  min-height: 650px;
}

.bottom_main {
  flex: 70%;
  padding: 20px;
  text-align: center;
}


/* Responsive layout - when the screen is less than 700px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 700px) {
  .container, .navbar {   
    flex-direction: column;
  }
}

        :root {
            --footer-top-bg: #ddd;
            --footer-top-text: #6c757d;
            --footer-top-heading: #343a40;
            --footer-top-link-hover: #0056b3;

            --footer-bottom-bg: #343a40;
            --footer-bottom-text: #adb5bd;
            --footer-bottom-link-hover: #ffffff;
        }

        /* Basic body styles for demonstration */
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            margin: 0;
            display: grid;
            grid-template-rows: 1fr auto;
            min-height: 100vh;
        }

        .main-content {
            padding: 2rem;
        }

        /* FOOTER STYLES START HERE */

        .footer-twotier {
            color: var(--footer-top-text);
        }
        
        /* === TOP TIER STYLES === */
        .footer-twotier__top {
            background-color: var(--footer-top-bg);
            padding: 3rem 1.5rem;
        }

        .footer-twotier__top-container {
            max-width: 1140px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr; /* Mobile-first: single column */
            gap: 2rem;
        }

        .footer-twotier__brand p {
            margin: 1rem 0 0 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        
        .footer-twotier__brand .logo {
            width: 150px;
            fill: var(--footer-top-heading);
        }


        .footer-twotier__heading {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--footer-top-heading);
            margin-top: 0;
            margin-bottom: 1rem;
        }

        .footer-twotier__links ul {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        
        .footer-twotier__links li {
            margin-bottom: 0.75rem;
        }

        .footer-twotier__links a {
            color: var(--footer-top-text);
            text-decoration: none;
            transition: color 0.2s ease-in-out;
        }

        .footer-twotier__links a:hover {
            color: var(--footer-top-link-hover);
            text-decoration: underline;
        }

        /* === BOTTOM TIER STYLES === */
        .footer-twotier__bottom {
            background-color: var(--footer-bottom-bg);
            color: var(--footer-bottom-text);
            padding: 1.5rem;
        }
        
        .footer-twotier__bottom-container {
            max-width: 1140px;
            margin: 0 auto;
            display: flex;
            flex-direction: column; /* Mobile-first: stack */
            align-items: center;
            gap: 1rem;
            font-size: 0.875rem;
            text-align: center;
        }
        
        .footer-twotier__bottom a {
            color: var(--footer-bottom-text);
            text-decoration: none;
            transition: color 0.2s ease-in-out;
        }

        .footer-twotier__bottom a:hover {
            color: var(--footer-bottom-link-hover);
            text-decoration: underline;
        }

        .footer-twotier__copyright {
            margin: 0;
        }
        
        .footer-twotier__social ul {
            margin: 0;
            padding: 0;
            list-style: none;
            display: flex;
            gap: 1.5rem;
        }
        
        .footer-twotier__social a:hover {
            text-decoration: none; /* Icons don't need underline */
        }
        
        .footer-twotier__social svg {
            width: 20px;
            height: 20px;
            fill: currentColor;
        }

        /* Media query for tablets and larger */
        @media (min-width: 768px) {
            .footer-twotier__top-container {
                grid-template-columns: 1.5fr 1fr 1fr; /* 3 columns on larger screens */
                gap: 3rem;
            }
            .footer-twotier__bottom-container {
                flex-direction: row; /* Arrange horizontally */
                justify-content: space-between;
                text-align: left;
            }
        }
/* Textbox */
.textbox {
  background-color: #f1f1f1;
  color:black;
  padding:20px;
  box-shadow: 5px 5px 5px lightblue;
  border-radius: 10px;
}

/* Textbox-leistung */
.textbox_leistung {
  background-color: #f1f1f1;
  color:black;
  padding:20px;
  box-shadow: 5px 5px 5px lightblue;
  border-radius: 10px;
}

.button {
  border: none;
  color: black;
  padding: 8px 16px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
  margin: 2px 1px;
  transition-duration: 0.4s;
  cursor: pointer;
  border-radius: 5px;
}

.button1 {
  background-color: #f1f1f1;
  text-decoration: none;
  //border: 2px solid black;
}

.button2 {
  background-color: lightblue;
  text-decoration: none;
  //border: 2px solid black;
}

.button1:hover {
  background-color: lightblue;
}