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

@media (max-width: 500px), (max-height: 600px) {
  html {
    font-size: 70%;
  }
}

@media (max-width: 280px), (max-height: 400px) {
  html {
    font-size: 50%;
  }
}

:root {
  --shadow-color: #7baca7;
  --background-color: #44c504b3;
  /* --background-color: #e0ebeb; */
  --main-color: #000000;
  --cell-size: 6.25rem;
  --cross-size: var(--cell-size);
  --circle-size: calc(var(--cell-size) * 0.65);
  --shape-width: calc(var(--cell-size) * 0.1);
}

body {
  background-color: var(--background-color);
}

h1 {
  color: blue;
  position: absolute;
  left: 50%;

  transform: translateX(-50%);
  font-size: 2.8rem;
  top: 0%;
}

h2{
color: var(--main-color);
font-size: 2rem;
margin-left: 20px;
margin-top: 20px;
margin-bottom: 0px;
}

h3{
color: var(--main-color);
font-size: 1.5rem;
margin-left: 33px;
margin-bottom: 100px;
}

@media (max-width: 200px), (max-height: 400px) {
  h1 {
    font-size: 2.4rem;
  }
}
.container {
  margin: auto;
  margin-top: 35vh;
  transform: translateY(-50%);
  display: grid;
  width: calc(var(--cell-size) * 3);
  height: calc(var(--cell-size) * 3);
  grid-template-columns: repeat(3, auto);
  padding-top: 10px;
  padding-bottom: 10px;
  padding-left: 10px;
  padding-right: 10px;
}

.cell {
  position: relative;
  width: var(--cell-size);
  height: var(--cell-size);
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  border: 2px solid var(--main-color);
}

/* remove external borders */
.cell:nth-child(1),
.cell:nth-child(2),
.cell:nth-child(3) {
  border-top: none;
}

.cell:nth-child(3n) {
  border-right: none;
}

.cell:nth-child(7),
.cell:nth-child(8),
.cell:nth-child(9) {
  border-bottom: none;
}

.cell:nth-child(3n-2) {
  border-left: none;
}

/* cursor not allowed on already occupied cell */
.cell.circle,
.cell.cross {
  cursor: not-allowed;
}

/* When we want circle */
.cell.circle::before,
.container.cross .cell:not(.circle):not(.cross):hover::before {
  content: "";
  background-color: var(--background-color);
  height: var(--circle-size);
  width: var(--circle-size);
  border-radius: 50%;
  box-shadow: 0 0 0 var(--shape-width) var(--shadow-color);
}

.cell.circle::before {
  box-shadow: 0 0 0 var(--shape-width) var(--main-color);
}

/* When we cant cross */
.cell.cross::before,
.container.circle .cell:not(.circle):not(.cross):hover::before {
  content: "";
  position: absolute;
  background-color: var(--shadow-color);
  width: var(--shape-width);
  height: var(--cross-size);
  transform: rotate(45deg);
}

.cell.cross::after,
.container.circle .cell:not(.circle):not(.cross):hover::after {
  content: "";
  position: absolute;
  background-color: var(--shadow-color);
  height: var(--shape-width);
  width: var(--cross-size);
  transform: rotate(45deg);
}

.cell.cross::before,
.cell.cross::after {
  background-color: var(--main-color);
}

.curr-turn {
  position: absolute;
  bottom: 12%;
  color: blue;
  font-size: 2rem;
  margin-bottom: 100px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  font-weight: 600;
  left: 50%;
  transform: translateX(-50%);
}

.winner {
  margin: auto;
  margin-top: 50vh;
}

.winner p {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 1rem;
}

.winner button {
  position: absolute;
  display: block;
  background-color: whitesmoke;
  border: 2px solid #706666;
  border-radius: 5px;
  font-size: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 15px 30px;
  transition: 0.5s ease;
}

.winner button:hover {
  cursor: pointer;
  border: 2px solid var(--main-color);
}

.hide {
  display: none;
}