@import url("https://fonts.googleapis.com/css2?family=Goldman&display=swap");
* {
  padding: 0;
  margin: 0;
  border: 0;
}

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

:focus, :active {
  outline: none;
}

a:focus, a:active {
  outline: none;
}

html, body {
  height: 100%;
  width: 100%;
  line-height: 1;
  font-size: 14px;
  -ms-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

input, button, textarea {
  font-family: inherit;
}

input::-ms-clear {
  display: none;
}

button {
  cursor: pointer;
}

button::-moz-focus-inner {
  padding: 0;
  border: 0;
}

a, a:visited, a:hover {
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img {
  vertical-align: top;
}

h1, h2, h3, h4, h5, h6 {
  font-size: inherit;
  font-weight: inherit;
}

body {
  font-family: "Goldman", cursive;
}

.header {
  text-align: center;
  margin: 20px 0;
}

.title {
  font-size: 28px;
}

.main {
  max-width: 380px;
  margin: 0 auto;
}

.playing-field {
  display: flex;
  flex-wrap: wrap;
  position: relative;
}

.playing-field.blocked::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: transparent;
  z-index: 100000;
}

.card {
  flex: 1 1 20%;
  height: 120px;
  margin: 5px;
  position: relative;
  transform-style: preserve-3d;
  transition: 0.6s;
}
.card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card.flipped {
  transform: rotateY(-180deg);
}

.card.opened .back {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(117, 182, 150, 0.5);
}

.winner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 350px;
  background: url(../assets/portal.png) 0 0/300px 350px no-repeat;
  z-index: 100;
  display: flex;
  align-items: center;
  text-align: center;
  font-size: 26px;
}

.front,
.back {
  height: 120px;
  width: 100%;
  border: 2px solid #000000;
  background: #ffffff;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  position: absolute;
  transition: 0.6s ease;
  top: 0;
  left: 0;
}

.front {
  z-index: 2;
  transform: rotateY(0deg);
}

.back {
  transform: rotateY(-180deg);
}