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

body {
  height: 100%;
  width: 100%;
  background: linear-gradient(to top left, #9b59b6, #1abc9c) no-repeat fixed;
  font-family: "Fredoka", sans-serif;
}

h1 {
  color: white;
  text-align: center;
}

.topTools {
  display: flex;
  justify-content: space-evenly;
  margin: 10px 0 10px 0;
}

.topTools .time {
  font-weight: bold;
  font-size: 25px;
  color: white;
}

.topTools img {
  width: 20px;
  height: 20px;
}

/*card container */
.memory-game {
  width: 550px;
  margin: auto;
  height: 500px;
  display: flex;
  flex-wrap: wrap;
  -webkit-perspective: 1000px;
  perspective: 1000px;
}

.memory-card {
  margin: 5px;
  width: calc(25% - 10px);
  height: calc(33.333% - 10px);
  position: relative;
  transform: scale(1);
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  transition: transform 0.5s; /* dönme efekti verir*/
  box-shadow: 5px 2px 20px 0 rgba(82, 102, 117, 0.5);
}

.memory-card:hover {
  cursor: pointer;
}

.memory-card:active {
  transform: scale(0.97);
  transition: transform 0.2s;
}

.memory-card.flip {
  -ms-transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  -moz-transform: rotateY(180deg);
  -o-transform: rotateY(180deg);
  transform: rotateY(180deg);
}

.front-face,
.back-face {
  position: absolute;
  height: 100%;
  width: 100%;
  padding: 20px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 5px;
}

.back-face {
  background-color: #456b91;
}

.front-face {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
  background-color: white;
}

img {
  width: 100px;
}

/*congrats section (gameWon) */
.hidden {
  display: none !important;
}

.show {
  display: block;
}

#congratsSection {
  position: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100vh;
  top: 0;
  left: 0;
}

#congratsDiv {
  width: 300px;
  background: white;
  color: #6186aa;
  padding: 20px 0 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  border-radius: 5px;
}

.final {
  font-weight: bold;
  font-size: 20px;
  letter-spacing: 2px;
  margin: auto;
  padding: 10px 20px;
}

.again {
  font-size: 20px;
  font-weight: bold;
  color: #6186aa;
  text-decoration: none;
  margin: auto;
  padding: 10px 20px;
  width: 160px;
  border: solid 1px;
  border-radius: 5px;
}

.again:hover {
  background: #6186aa;
  background-image: linear-gradient(to top left, #9b59b6, #1abc9c);
  background-size: 250%;
  color: white;
  cursor: pointer;
}

/*responsive*/
@media only screen and (max-width: 768px) {
  h1 {
    margin-top: 100px;
    font-size: 22px;
  }

  .topTools {
    margin: 20px 0 20px 0;
  }

  .topTools .time {
    font-weight: thin;
    font-size: 18px;
  }

  .topTools img {
    width: 17px;
    height: 17px;
  }

  .memory-game {
    width: 350px;
    height: 450px;
  }

  .memory-card {
    margin: 5px;
    width: calc(33.333% - 10px);
    height: calc(25% - 10px);
  }
}