index.css

/*||General styles||*/
body {
  height: 100vw;
  margin-bottom: 1rem;
  padding: 0;
/* pool table green */
  background-color: hsl(116, 95%, 22%);
  color: white;
  font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
  font-size: 16px;
}

h1 {
  text-align: center;
  font-family:cursive;
  color: white;
  font-size: 6em;
  text-shadow: 2px 2px red;
}

h2 {

  text-align: center;
  font-size: 3em;
  
  
}
p {
  text-align: justify;
}

a {
  color: rgb(0, 255, 247);
}
/*|| Grid-layout||*/

.playingCards {
  /* grid container*/
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7em, 1fr));
  /*auto-fit allows browser to calculate column sizing and wrapping
      minmax() sets min width of each column-set so cards don't shrink on resizing of
      browser
      1st value sets min width, 2nd value sets max, fr used for flexible layout*/
  grid-gap: 0.7em;
  /*em units used for flexible sizing*/
  width: 80vw;
  font-size: 1em;
  margin-left: auto;
  margin-right: auto;
}

.playingCards .card .front,
.playingCards .card .back {
  position: relative;
  /*relative to grid container*/

  width: 7em;
 
  margin-top: 2em;
  font-size: 2em;
}

/*|| Card styling||*/
/*Applys svg playing card image to cards*/

.playingCards .card.rank-7.spades .front {
  background-image: url(images/spades_7.svg);
  background-size: 3.5em 6em;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 0.3em;
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
}

.playingCards .card.rank-7.diamonds .front {
  background-image: url(images/diamonds_7.svg);
  background-size: 3.5em 6em;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 0.3em;
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
}

.playingCards .card.rank-7.clubs .front {
  background-image: url(images/clubs_7.svg);
  background-size: 3.5em 6em;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 0.3em;
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
}

.playingCards .card.rank-7.hearts .front {
  background-image: url(images/hearts_7.svg);
  background-size: 3.5em 6em;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 0.3em;
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
}

.playingCards .card.rank-2.clubs .front {
  background-image: url(images/clubs_2.svg);
  background-size: 3.5em 6em;
  background-position: center center;
  background-repeat: no-repeat;
  border-radius: 0.3em;
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
}


.playingCards .card .back {
  background-image: linear-gradient(to bottom right, white, black);
  border-radius: 0.5em;
  background-size: 4em 6em;
  background-repeat: no-repeat;
  background-position: center center;
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
}

/*|| Hide back of cards||*/
.playingCards .card {
  position: relative;
  width: 7em;
  height: 12em;
  perspective: 1000px;
}

.playingCards .card .front,
.playingCards .card .back {
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.playingCards .card .front {
  z-index: 2;
  /*ensures front of cards remain on top*/
}

/*||Raise on hover||*/
.playingCards .card .front:hover {
  box-shadow: 7px 9px 10px 1px rgba(0, 0, 0, 0.5);
  /*shadow moves with cards on hover - changes here must be 
    made above also in .playingCards .card */
  transform: translateY(-15px);
  transition: all 0.5s ease-in-out;
  /*raise effect smoother with transition property
    all value means all animatable properties */
}
/*|| Expand card size declared here - when javascript function called this selector is passed through as an argument for the toggle.
this class selector will be added or removed by the javascript toggle||*/
.card.expanded { 
  transition: all 0.3s ease-out;
  transform: scale(1.3);
}

/*|| Flip when clicked||*/
.playingCards .card .back {
  transform: rotateY(180deg);
}

.playingCards .card:active .front {
  animation: flip-front 1s forwards;
}

.playingCards .card:active .back {
  animation: flip-back 1s forwards;
}

@keyframes flip-front {
  from {
    transform: rotateY(0deg);
  }

  to {
    transform: rotateY(-180deg);
  }
}

@keyframes flip-back {
  from {
    transform: rotateY(180deg);
  }

  to {
    transform: rotateY(0deg);
  }
}
/* Responsive columns - one column layout (vertical) on small screens */
@media screen and (max-width: 600px) {
  .playingCards {
    /* grid container */
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(7em, 1fr));
    grid-gap: 0.7em;
    width: 80vw;
    font-size: 0.8em; 
/* reduce font size on small screens */
  }
}
/*
created during planning phase but not used

||flex-layout||
.playingCards {
  display: flex;
  flex-wrap: wrap;
}

.playingCards .card {
  position: relative;
  width: 2.5em;
  height: 3.5em;
  margin: 0.1em;
  background-color: white;
  border-radius: 0.25em;
  box-shadow: 0px 0px 5px rgba(0,0,0,0.5);
}*/