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

:root {
  --day: #e4ede6;
  --day-text: #3c423d;
  --day-text-2: #232624;
  --boarder-color: #b2bbb4;
  --white: #fff;
  --pl-color: rgb(238, 29, 10);
  --cm-color: #ecf025;
  --glow-yl-1: rgb(213, 213, 100);
  --glow-yl-2: rgb(233, 233, 34);
  --glow-yl-3: rgb(243, 243, 16); 
  --glow-rd-1: rgb(200, 79, 79);
  --glow-rd-2: rgb(214, 35, 32);
  --glow-rd-3: rgb(230, 5, 5); 
  --box-color: #77776f;
  --shadow: 0px 3px 3px;
  --rst-btn: linear-gradient(80deg, rgb(227, 73, 99) 50%, var(--cm-color));
}

/* global */
.color-x {
  color: var(--pl-color);
}

.color-o {
  color: var(--cm-color);
}

.hidden {
  display: none;
}

::selection {
  background-color: transparent;
}

body {
  font-family: "Macondo", sans-serif;
  background: var(--day);
  color: var(--day-text);
}

/* ================= nav section */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  padding-left: 1rem;
  height: 10vh;
  width: 100%;
  z-index: 2;
}

.nav .toggle {
  position: relative;
  display: inline-block;
  width: 80px;
  height: 60%;
  margin-top: 1%;
  background: linear-gradient(90deg, #44A08D, #093637);
  border-radius: 20px;
  cursor: pointer;
  border: 2px solid var(--day-text-2);
}

.toggle .toggle__btn {
  position: absolute;
  top: 12%;
  left: 10%;
  height: 25px;
  width: 25px;
  border-radius: 50%;
  transition: all 0.5s ease-in-out;
}

.toggle__btn img {
  height: 100%;
  width: 100%;
}

.nav .mode {
  display: block;
}

/* ================= game section */
.game {
  height: 100vh;
  display: flex;
  align-items: center;
  /* overflow: hidden; */
}

.game .game__name {
  flex: 1;
  text-align: center;
}

.game__name > h1 {
  font-size: 2.5rem;
  letter-spacing: 1px;
}

.game__name .game__img {
  width: 80px;
  height: 80px;
}

.game__playground {
  height: 100%;
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: var(--text-color-2);
}

.point-table {
  display: flex;
  width: 100%;
  justify-content: space-evenly;
  margin-bottom: 1rem;
  font-weight: 600;
}

.point-table .point__box {
  padding: 0.5rem;
  width: 50px;
  height: 80px;
  text-align: center;
  border-radius: 3px;
  border: 2px solid var(--boarder-color);
}

.point-table .player,
.point-table .computer {
  background: rgba(0, 0, 0, 0.1);
  box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.1);
}

.player :nth-child(2),
.computer :nth-child(2) {
  padding-top: 0.5rem;
  font-size: 1.5rem;
  text-shadow: 2px 1px var(--box-color);
}

.player .player__symbol {
  color: var(--pl-color);
}

.computer .computer__symbol {
  color: var(--cm-color);
}

.game-board {
  margin: 0 auto;
  padding: 0.8rem;
  width: 60%;
  height: 60%;
  max-width: 700px;
  display: grid;
  grid-template-rows: auto;
  background: var(--boarder-color);
  border-radius: 5px;
}

.game-board .row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.row .box {
  margin: 2px;
  font-weight: 800;
  cursor: alias;
}

.box .flip {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 5px;
  background: var(--box-color);
  transition: transform 0.5s;
  transform-style: preserve-3d;
}

/* Place the front and back  */
.front,
.back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Back Differences */
.back {
  transform: rotateY(180deg);
  font-size: 2.4rem;
}

/* restart button */

.restart-msg {
  position: absolute;
  top: 50%;
  left: 50%;
  padding: 1rem;
  border: 2px solid red;
  color: var(--white);
  transform: translate(-50%);
  background: rgb(9, 9, 8);

}

.restart-btn {
  padding: 1rem;
  background: var(--rst-btn);
  border-radius: 50%;
  color: var(--white);
  cursor: pointer;
  margin-top: 1.2rem;
  box-shadow: 0px 3px 3px rgba(0, 0, 0, 0.3);
}

/* media query for responsiveness */
@media (max-width: 764px) {
  .game {
    display: block;
  }

  .game__name {
    height: 10vh;
  }

  .game .point-table {
    margin-bottom: 1.5rem;
  }

  .game__name > h1 {
    height: 100%;
  }

  .game .game__playground {
    height: 90vh;
  }

  .game__name .game__img {
    display: none;
  }
}

/* mobile size media query */
@media (max-width: 440px) {
  .game-board {
    width: 90%;
  }

  .game__name h1 {
    display: none;
  }

  .restart-msg {
    padding: .5rem;
  }
}