* {
  margin: 0;
  padding: 0;
  font-family: "montserrat", sans-serif;
  scroll-behavior: smooth;
  box-sizing: border-box;
}
::-webkit-scrollbar {
  height: 0px;
  width: 0px;
}

/* ============
   Color Theme
   ============ */

:root {
  --primary-txt-color: #e0e0e0;
  --secondary-txt-color: #a8a8a8;
  --green-background: rgb(0, 255, 0, 0.2);
}

/* ============
    Background
   ============ */
.cover,
.background {
  height: 100vh;
  width: 100%;
}
.background {
  background: url(img/architecture-columns-dark-1874636.jpg) no-repeat;
  background-size: 100% 100%;
  animation: scale-ani 20s linear infinite;
  /* use opacity for brighter images  */
  opacity: 0.9;
}
@keyframes scale-ani {
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}

/* ============
   Opacity Cover
   ============ */
.cover {
  background: rgb(0, 0, 0);
  overflow: hidden;
}

/* ============
   Content Blocks 
   ============ */
section {
  width: 100%;
  height: 100vh;
}
.page-content {
  width: 100%;
  height: 100vh;
}

/* Div that holds H1 and link-container 
should be direct child of section tag */

section .page-content {
  position: absolute;
  transform: translate(0, -100%);
  width: 100%;
  height: 100vh;
  text-align: center;
}

.link-container {
  background: var(--green-background);
  margin-top: 10vh;
}
.content-1 {
  text-align: center;
  text-transform: uppercase;
}
.content-1 a {
  color: var(--primary-txt-color);
  padding: 2vh 3vw;
  animation: fadein 1.2s ease-in;
}

.content-2 {
  /* background-color: red; */
  /* opacity: 0.1; */
}
.content-1 h1 {
  letter-spacing: 10px;
  padding: 10vw 10vw 0vw 10vw;
  font-size: 7vw;
  color: var(--primary-txt-color);
  font-weight: 900;
  animation: fadein 1s ease-in;
}

/* ============
      Links
   ============ */

.external {
  display: inline-block;
  text-decoration: none;
  font-weight: 900;
  color: var(--primary-txt-color);
  transition: 0.5s;
}

.arrow {
  font-size: 60px;
  padding: 0.25em 0.1em;
  text-decoration: none;
  color: var(--secondary-txt-color);
}
/* Div that holds the arrow */
.arrow-down {
  position: absolute;
  top: 80%;
  width: 100%;
}

/* ============
   Hover effects
   ============ */

.arrow:hover {
  font-size: 80px;
  transition: 0.25s;
  color: rgb(0, 0, 0, 0.8);
  cursor: none;
}

.external:hover {
  color: rgb(0, 0, 0, 0.7);
  font-size: 40px;
  transition: 0.5s;
}

/* ============
  Media Queries
   ============ */

@media screen and (max-width: 768px) {
  .link-container {
    background: none;
    margin-top: 25vh;
  }
  .page-content a:not(.arrow) {
    border: 1px solid var(--secondary-txt-color);
    display: block;
    background: var(--green-background);
    animation: btn-anim-mob ease 1s;
    margin-top: 2vh;
  }
  #content-1 > h1 {
    color: var(--secondary-txt-color);
    font-weight: 300;
    font-size: 12vw;
    animation: none;
  }
  .content-1 .arrow {
    color: var(--secondary-txt-color);
    animation: fadein 2s;
  }

  @keyframes btn-anim-mob {
    0% {
      margin-top: 100vh;
    }
    100% {
      margin-top: 2vh;
    }
  }
}

@keyframes fadein {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}