*{
font-family: 'Poppins', sans-serif;
}


/***---GLOBAL PROPERTIES---***/

* {
  box-sizing: border-box;
}

html {
  width: 100vw;
  height: 100vh;
  background-color: rgb(25, 25, 25);
}

body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}


/***---CONTAINER PROPERTIES---***/

#calculator {
  font-family: 'Poppins', sans-serif;
  background-color: rgb(25, 25, 25);
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 4% 3%;
  position: relative;
}

#container {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  position: relative;
  top: -25px;
}

#screenContainer {
  position: relative;
  left: -20px;
  width: 100%;
  height: 22%;
  /*  for testing purposes only */
}

#screen {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translate(0, -50%);
  background-color: inherit;
  color: #fff;
}

.fontLrg {
    font-size: 3.35em;
  }

.fontMed {
  font-size: 2.05em;
}

.fontSm {
  font-size: 1.45em;
}

.row {
  width: 100%;
  height: 15.6%;
  display: flex;
  align-items: center;
}


/***---BUTTON PROPERTIES---***/

.click {
  height: 91%;
  width: 22%;
  margin: auto;
  font-size: 1.75em;
  text-align: center;
  border-radius: 20px;
  color: #fff;
  background-color: rgb(136, 136, 136);
  border: none;
  transition: transform 0.175s ease-in-out;
}

.click:focus {
  outline: 0;
}

.click:hover {
  transform: scale(1.04);
}

.click:active {
  transition-duration: 0.1s;
  transform: scale(0.95);
}

.operator {
  background-color: #ff3c00;
}

#clear {
  width: 72%;
  font-size: 1.75em;
  letter-spacing: 0.08em;
}

#equals {
  width: 47%;
}


/***---MEDIA QUERIES---***/

/*---Portrait Screens---*/

/*Small screens 400px - 600px wide & up to 850px high*/
@media screen and (min-width: 400px) and (max-width: 600px)
    and (max-height: 850px) {

/*  for testing purposes only */

  .fontLrg {
    font-size: 4.2em;
  }

  .fontMed {
    font-size: 2.6em;
  }

  .fontSm {
    font-size: 1.9em;
  }
      
  .click,
  #clear {
    font-size: 2em;
  }
}


/*Medium screens 601px+ wide & 851px+ high*/
@media screen and (min-width: 601px) and (min-height: 851px) {

/*  for testing purposes only */

  .fontLrg {
    font-size: 8em;
  }

  .fontMed {
    font-size: 5em;
  }

  .fontSm {
    font-size: 3.5em;
  }

  .click {
    width: 22%;
    height: 89%;
    margin: auto;
    font-size: 3.5em;
  }

  #clear {
    width: 72%;
    font-size: 3.5em;
  }

  #equals {
    width: 47%;
  }
}


/*Large screens 1000px+ wide & 851px+ high*/
@media screen and (min-width: 1000px) and (min-height: 851px) {

  #calculator {
    padding: 2% 3%;
  }

  #screenContainer {
    height: 25%;
/*    for testing purposes only */
  }

  .row {
    height: 15%;
  }

  .fontLrg {
    font-size: 10em;
  }

  .fontMed {
    font-size: 6.25em;
  }

  .fontSm {
    font-size: 4.75em;
  }

  .click {
    width: 23%;
    height: 85%;
    margin: auto;
    font-size: 4em;
  }

  #clear {
    width: 73%;
    font-size: 3.5em;
  }

  #equals {
    width: 48%;
  }
}




/*---Landscape Screens---*/

/*Small screens up to 850px wide & up to 450px high*/
@media screen and (max-width: 850px) and (max-height: 450px) {

  #calculator {
    padding: 2% 5%;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }

  #screenContainer {
    height: 25%;
/*    for testing purposes only */
  }

  .row {
    height: 15%;
  }

  .fontLrg {
    font-size: 4.5em;
  }

  .fontMed {
    font-size: 2.9em;
  }

  .fontSm {
    font-size: 2.1em;
  }

  .click {
    font-size: 2em;
    width: 23%;
    height: 80%;
    margin: auto;
  }

  #clear {
    width: 73%;
    font-size: 2em;
  }

  #equals {
    width: 48%;
  }
}


/*Medium Screens 851px+ wide & 451px+ high & orientation is landscape
(so that medium/large portrait screen queries do not get overridden)*/
@media screen and (min-width: 851px) and (min-height: 451px) and (orientation: landscape) {

  #calculator {
    padding: 2% 3%;
  }

  #screenContainer {
    height: 25%;
/*    for testing purposes only */
  }

  .row {
    height: 15%;
  }

  .fontLrg {
    font-size: 6.75em;
  }

  .fontMed {
    font-size: 5.5em;
  }

  .fontSm {
    font-size: 3.9em;
  }

  .click {
    width: 23%;
    height: 85%;
    margin: auto;
    font-size: 3.25em;
  }

  #clear {
    width: 73%;
    font-size: 2.75em;
  }

  #equals {
    width: 48%;
  }
}


/*Large Screens 1400px+ wide & 451px+ high*/
@media screen and (min-width: 1400px) and (min-height: 451px) {

  #container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
  }

/*  for testing purposes only */

  .fontLrg {
    font-size: 10.5em;
  }

  .fontMed {
    font-size: 8.25em;
  }

  .fontSm {
    font-size: 5.85em;
  }

  .click {
    font-size: 3.25em;
  }

  #clear {
    font-size: 2.75em;
  }
}