:root {
  --primary-color: #009688;
  --secondary-color: #20201f;
  --text-color: #939292;
  --border-color: #3c4043;
  --highlight-color: #0da192;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  background-color: var(--secondary-color);
}

h1 {
  text-align: center;
  color: var(--primary-color);
  font-size: 38px;
  margin: 30px 0;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.game {
  width: 650px;
  margin: 20px auto;
  background-color: var(--primary-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}
.game .header {
  padding: 20px;
  background-color: var(--secondary-color);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
}
.game .header h3 {
  color: var(--text-color);
  font-size: 18px;
  width: 100%;
  text-align: center;
}
.game #game-mode {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  background-color: var(--secondary-color);
  color: var(--text-color);
  border: none;
  outline: none;
  cursor: pointer;
}
option {
  border: none;
  outline: none;
  background: var(--secondary-color);
  color: white;
}
option:hover,
option:focus {
  background: var(--text-color);
}
.game .header > button {
  padding: 8px 30px;
  background: none;
  color: white;
  width: 200px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-width: 1px 1px 0 1px;
  border-style: solid;
  border-color: var(--border-color);
  border-radius: 6px;
  font-size: 20px;
  text-transform: uppercase;
  cursor: pointer;
}
.game .header > button.choosen {
  border-bottom: 2px solid var(--primary-color);
}
.game .header .game-summary {
  width: 100%;
  text-align: center;
  color: var(--text-color);
  font-size: 15px;
}
.game .game-cards {
  padding: 15px 0;
  width: 240px;
  margin: auto;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
.game .game-cards .card {
  width: 80px;
  height: 80px;
  border-right: 7px solid var(--highlight-color);
  border-bottom: 7px solid var(--highlight-color);
  position: relative;
}

.game .x-shape::before,
.game .x-shape::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 55px;
  background-color: #545454;
  top: 50%;
  left: 50%;
}
.game .x-shape::before {
  transform: translate(-50%, -50%) rotate(45deg);
}
.game .x-shape::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.game .o-shape {
  position: absolute;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  border: 6px solid white;
  background-color: transparent;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.game .game-cards .card:nth-of-type(3),
.game .game-cards .card:nth-of-type(6),
.game .game-cards .card:nth-of-type(9) {
  border-right: none;
}
.game .game-cards .card:nth-of-type(7),
.game .game-cards .card:nth-of-type(8),
.game .game-cards .card:nth-of-type(9) {
  border-bottom: none;
}

.game .winner {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: var(--primary-color);
  top: -100%;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 35px;
  text-transform: uppercase;
  font-weight: bold;
  color: #545454;
  transition: 0.3s;
}
.game .winner.show {
  top: 0;
}
.game .winner .x-shape::after,
.game .winner .x-shape::before {
  top: 24%;
  width: 10px;
  height: 90px;
}

.game .winner .o-shape {
  width: 90px;
  height: 90px;
  border-width: 11px;
  top: 23%;
}
.game .draw .x-shape::after,
.game .draw .x-shape::before {
  left: 28%;
}
.game .draw .o-shape {
  left: 70%;
}
.game .footer {
  padding: 20px;
  background-color: var(--secondary-color);
  display: flex;
  justify-content: center;
}
.game .footer button {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: 17px;
  font-weight: bold;
  cursor: pointer;
}