* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --col-main-bg:hsl(268, 3%, 19%);
  --col-main-text: hsla(88, 53%, 90%, 1);
  --col-banner-bg:var(--col-main-bg);
  --col-banner-text:var(--col-main-text);
  --shell-col-bg: hsl(268, 3%, 25%);
  --shell-col-text:var(--col-banner-text);  
  --shell-borders:2px ridge hsla(7, 80%, 50%, 0.6);
  --col-nav-text-hover: hsla(7, 80%, 59%, 0.8);
  
  --exhibit-content-shadow: 0 4px 4px 0px rgb(39, 39, 39);
  --exhibit-content-border-radius:20px;

  --max-width-shell: 1600px;


  --nav-height: 55px;
  --nav-shadow: 0 0 5px 0px rgb(31, 31, 31);

  --footer-opacity: 0.8;
  --col-footer-bg:var(--shell-col-bg);
}

body, html {
  width:100%;
	height:100%;
  background:var(--col-main-bg);
}

html{
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  scroll-behavior: smooth;
}

body{
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: hidden;
}

/* NAVBAR */
nav {
  position: fixed;
  left: 0;
  top: 0;
  
  z-index: 400;  
  width: 100%;
  height: var(--nav-height);  
  background-color: var(--shell-col-bg);

  border-bottom: var(--shell-borders);
  box-shadow: var(--nav-shadow);
  opacity: 0.95;

  padding: 0 5rem;  

  display: flex;
  align-items: center;
  justify-content: center;
}

nav a {
  position: relative;
  

  cursor:pointer;
  text-decoration: none;
  /* text-transform: uppercase; */
  letter-spacing: 0.09em;
  font-size: 1.3em;
  margin: auto 5rem;  
  text-align: center; 
  padding: 5px 10px;
  color: var(--shell-col-text);
  opacity: 0.9;
  border-radius: 3px;

  transition: background-color 0.1s ease-in-out, box-shadow 0.1s ease-in-out, color 0.1s ease-in-out;
}
nav a:hover {
  /* background-color: hsla(7, 100%, 34%, 0.3);
  box-shadow: 0 0 4px 4px hsla(7, 100%, 34%, 0.3); */
  color: var(--col-nav-text-hover);
}
nav a:nth-child(3) {
  opacity: 0.3;
  pointer-events: none;
}

/* BANNER */

.banner {
  background-color: var(--col-banner-bg);
  width: 100vw;
  /* max-width: var(--max-width-shell); */
  height: 100vh;
  display: flex;
  flex-flow: column;
  align-items: center;
  justify-content: center;

  text-align: center;
  color: var(--col-banner-text);
  border-bottom: var(--shell-borders);

  position: relative;
  z-index: 100;
  margin: auto;
}

.banner {
  font-size: 1.5rem;
}
.banner > h1, .banner > h2 {
  margin: 40px;
  padding: initial;
  letter-spacing: 0.1em;
  user-select: none;
  opacity: 0.8;
}

.parallax-wrapper {
  height: 400px;
  width: 100vw;
  /* max-width: var(--max-width-shell); */
  overflow: hidden;
  position: relative;

  margin: auto;
}

.part {
  width: 100vw;
  /* max-width: var(--max-width-shell); */
  height: 1300px;
  background-color: white;
  position: absolute;
  z-index: 10;

  top: -50%;

  opacity: 1;
}

.exhibit {
  width: 100vw;
  /* max-width: var(--max-width-shell); */
  height: 1600px;
  background-color: var(--col-main-bg);
  color: var(--col-main-text);

  display: flex;
  flex-flow: column;
  align-items: center;
  justify-content: center;

  border-top: var(--shell-borders);
  border-bottom: var(--shell-borders);

  position: relative;
  z-index: 100;
  margin: auto;

  text-align: center;
  user-select: none;
}


.exhibit > h3 {
  position: absolute;
  top: 150px;
  opacity: 0.5;
}

.exhibit > h1 {
  position: absolute;
  top: 250;
  opacity: 0.85;
}

.exhibit-content {
  width: 90%;
  max-width: 1200px;
  height: 800px;
  max-height: 90vh;
  /* so we can use a border if necessary, without affecting the inside.
    inside there will be the project div, having the same dimensions,
    but havgin box-sizing set to border-box  */

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--exhibit-content-border-radius);
  border: var(--exhibit-content-border);  
  box-shadow: var(--exhibit-content-shadow);
  position: relative;
}


footer {
  height: 60px;
  /* border-top: var(--shell-borders); */
  background-color: var(--col-footer-bg);
  color: var(--shell-col-text);
  opacity: var(--footer-opacity);
  user-select: none;
}

footer > p {
  padding: 20px;
  font-weight: 100;
  text-align: center;
}