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

body {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;

  min-height: 100vh;
  padding: 20px;

  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}


/* block-$ */
.block-effect {
  font-size: calc(8px + 6vw);
}

.block-reveal {
  --t: calc(var(--td) + var(--d));

  color: transparent;
  padding: 4px;

  position: relative;
  overflow: hidden;

  animation: revealBlock 0s var(--t) forwards;
}

.block-reveal::after {
  content: '';

  width: 0%;
  height: 100%;
  padding-bottom: 4px;

  position: absolute;
  top: 0;
  left: 0;

  background: var(--bc);
  animation: revealingIn var(--td) var(--d) forwards, revealingOut var(--td) var(--t) forwards;
}


/* animations */
@keyframes revealBlock {
  100% {
    color: #0f0f0f;
  }
}

@keyframes revealingIn {

  0% {
    width: 0;
  }

  100% {
    width: 100%;
  }
}

@keyframes revealingOut {

  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(100%);
  }

}

/* Transition from INTRO to MAIN page */

#intro-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;

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

    background: #FAFAF7;
    /* 'color' is text color */
    /*color: orangered; */

    transition: transform 1s ease-in-out;
    z-index: 2; /* on top */
}

/* MAIN SITE UNDERNEATH */
#main-frame {
    -webkit-overflow-scrolling: touch;
    position: absolute;
    top: 0;
    left: 0;

    width: 100%;
    height: 100vh;

    border: none;
    z-index: 1; /* below intro */
}

/* Class added when it should slide up */
.slide-up {
    transform: translateY(-100%);
}