.page_blocks{position:absolute;left:0;top:0;padding: 2rem 3rem;font-family:'Sofia Pro';font-size: 16px;font-weight:normal;line-height:normal;}
.page_sitename{display:inline-block;position:relative;}
.page_sitename a{color: #2d2d2d;display:inline-block;text-decoration:none;}
.page_sitename a span{color:#d24949;}
.page_sitename a:hover{color:#a2a2a2;text-decoration:none;}
.page_sitename a:first-child:after{content:'|';font-size: 10px;margin: 0 0.8rem;position:relative;top: -1px;}
.page_links{display:inline-block;margin:0 2rem;}
.page_links a{color:#c1c1c1;text-decoration:none;font-weight:300;}
.page_links a:hover{color:#a2a2a2;text-decoration:none;}
@media (max-width: 500px){.page_blocks{right:0;text-align:center;}}

input[type="radio"],
input[type="checkbox"] {
  position: absolute;
  top: -9999em;
}

#menu {
  display: block;
  background: rgba(0,0,0,0.8);
  text-align: center;
}

#menu > div {
  background: #fff;
  padding: 1rem 2rem;
  border-radius: 10px;
}

.toggle-group {
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  font-family: Arial, sans-serif;
}

.toggle-group span {
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
  text-align: left;
}

.toggle-group span:nth-of-type(1) {
  text-align: right;
}

.toggle {
  display: inline-block;
  width: 3rem;
  height: 1.5rem;
  background: #ddd;
  vertical-align: bottom;
  margin: 0.33rem 0.5rem;
  border-radius: 1rem;
  position: relative;
  cursor: pointer;
}

.toggle::before {
  content: "";
  position: absolute;
  display: block;
  width: 1rem;
  height: 1rem;
  top: 0.25rem;
  left: 0.25rem;
  background: #000;
  background: #004974;
  border-radius: 100%;
  transition: left 0.25s, background-color 0.25s;
}

.btn {
  width: 100%;
  display: inline-block;
  background: #000;
  color: #fff;
  border-radius: 5px;
  font-family: Arial, sans-serif;
  margin-top: 2rem;
  padding: 0.33rem;
  box-sizing: border-box;
  cursor: pointer;
  transition: background-color 0.25s;
}

.btn:hover {
  background: #333;
}

#start:checked ~ form #menu {
  display: none;
}

#difficulty:checked ~ form #menu label[for=difficulty]::before,
#sound:checked ~ form #menu label[for=sound]::before,
#first:checked ~ form #menu label[for=first]::before {
  left: 1.75rem;
  background: #a60011;
}

h1 {
  margin: 1rem 0 0.5rem 0;
  text-align: center;
  white-space: nowrap;
  color: #004974;
  font-size: 1.9rem;
  font-weight: normal;
}

h2 {
  font-size: 0.9rem;
  text-transform: uppercase;
  margin: 1.25rem 0 0.1rem 0;
  color: #a60011;
}

html, body {
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 30px;
  margin: 0;
}

.center {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

#board {
  width: 50vmin;
  height: 50vmin;
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 1fr 1fr;
  grid-template-columns: 1fr 1fr 1fr;
  -ms-grid-rows: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr;
}

.tile {
  position: relative;
}

.tile label,
.tile div {
  display: block;
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  font-family: Arial, 'Courier New', Sans, sans-serif;
  font-weight: bold;
}

.tile div {
  display: none;
  overflow: hidden;
}
@-webkit-keyframes shadow {
  from { box-shadow: 0 0 0 0 rgba(255,0,0,0); } 
  to { box-shadow: 0 0 10px 4px rgba(255,0,0,0.35); } 
}
@keyframes shadow {
  from { box-shadow: 0 0 0 0 rgba(255,0,0,0); } 
  to { box-shadow: 0 0 10px 4px rgba(255,0,0,0.35); } 
}

#label-computer {
  width: 225px;
  max-width: 50vmin;
  position: absolute;
  top: 80%;
  top: calc(50% + 30vmin);
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  text-align: center;
  -webkit-animation: shadow 0.75s infinite alternate;
  animation: shadow 0.75s infinite alternate;
}

@-webkit-keyframes beginnerAnimation {
  from { z-index: 9; }
  to { z-index: 1; }
}
@keyframes beginnerAnimation {
  from { z-index: 9; }
  to { z-index: 1; }
}

#label-computer label {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  -webkit-animation: beginnerAnimation 0.9s infinite;
  animation: beginnerAnimation 0.9s infinite;
}

#label-computer label:active {
  position: static !important; 
  margin-left: 100% !important;
  background: none !important;
  font-size: 0;
}

#label-computer label:active::before {
    content: "";
    position: absolute;
    top: 0;
    right: -50px;
    left: 0;
    bottom: 0;
    z-index: 101;
}

#label-computer label:nth-child(1) { -webkit-animation-delay: -0.1s;animation-delay: -0.1s; }
#label-computer label:nth-child(2) { -webkit-animation-delay: -0.2s;animation-delay: -0.2s; }
#label-computer label:nth-child(3) { -webkit-animation-delay: -0.3s;animation-delay: -0.3s; }
#label-computer label:nth-child(4) { -webkit-animation-delay: -0.4s;animation-delay: -0.4s; }
#label-computer label:nth-child(5) { -webkit-animation-delay: -0.5s;animation-delay: -0.5s; }
#label-computer label:nth-child(6) { -webkit-animation-delay: -0.6s;animation-delay: -0.6s; }
#label-computer label:nth-child(7) { -webkit-animation-delay: -0.7s;animation-delay: -0.7s; }
#label-computer label:nth-child(8) { -webkit-animation-delay: -0.8s;animation-delay: -0.8s; }
#label-computer label:nth-child(9) { -webkit-animation-delay: 0s;animation-delay: 0s; }


/* Special cases */
#cell-0-x:checked ~ #cell-4-x:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-2-o'],
#cell-0-x:checked ~ #cell-4-x:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-6-o'],
#cell-2-x:checked ~ #cell-4-x:checked ~ #cell-6-o:checked ~ #label-computer label[for='cell-0-o'],
#cell-2-x:checked ~ #cell-4-x:checked ~ #cell-6-o:checked ~ #label-computer label[for='cell-8-o'],
#cell-2-o:checked ~ #cell-4-x:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-0-o'],
#cell-2-o:checked ~ #cell-4-x:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-8-o'],
#cell-0-o:checked ~ #cell-4-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-2-o'],
#cell-0-o:checked ~ #cell-4-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-6-o'] {
  z-index: 65;
  -webkit-animation: none;
  animation: none;
}

@-webkit-keyframes miniAnimation {
  from { z-index: 75; }
  to { z-index: 72; }
}
@keyframes miniAnimation {
  from { z-index: 75; }
  to { z-index: 72; }
}

#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-0-o'],
#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-2-o'],
#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-6-o'],
#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-8-o'] {
  z-index: 75;
  -webkit-animation: miniAnimation 0.4s infinite linear;
  animation: miniAnimation 0.4s infinite linear;
}

#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-0-o'] { -webkit-animation-delay: -0.3s;animation-delay: -0.3s; }
#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-2-o'] { -webkit-animation-delay: -0.2s;animation-delay: -0.2s; }
#cell-0-o:not(:checked) ~ #cell-2-o:not(:checked) ~ #cell-4-x:checked ~ #cell-6-o:not(:checked) ~ #cell-8-o:not(:checked) ~ #label-computer label[for='cell-6-o'] { -webkit-animation-delay: -0.1s;animation-delay: -0.1s; }



#difficulty:checked ~ form #cell-0-x:checked ~ #cell-4-o:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-1-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-4-o:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-3-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-4-o:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-5-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-4-o:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-7-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-4-o:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-1-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-4-o:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-3-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-4-o:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-5-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-4-o:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-7-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-3-x:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-3-x:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-3-x:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-4-o:checked ~ #cell-5-x:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-4-o:checked ~ #cell-5-x:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-4-o:checked ~ #cell-5-x:checked ~ #label-computer label[for='cell-8-o'],
#difficulty:checked ~ form #cell-3-x:checked ~ #cell-4-o:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-3-x:checked ~ #cell-4-o:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-3-x:checked ~ #cell-4-o:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-8-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-5-x:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-5-x:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-5-x:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-8-o']
{
  z-index: 70;
  -webkit-animation: none;
  animation: none;
}

/* Prevent other player from winning! */
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-2-x:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-3-x:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-4-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-2-x:checked ~ #label-computer label[for='cell-1-o'],
#difficulty:checked ~ form #cell-4-x:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-1-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-1-x:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-5-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-4-x:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-6-x:checked ~ #label-computer label[for='cell-3-o'],
#difficulty:checked ~ form #cell-4-x:checked ~ #cell-5-x:checked ~ #label-computer label[for='cell-3-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-5-o'],
#difficulty:checked ~ form #cell-3-x:checked ~ #cell-4-x:checked ~ #label-computer label[for='cell-5-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-3-x:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-4-x:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-7-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-1-x:checked ~ #cell-4-x:checked ~ #label-computer label[for='cell-7-o'],
#difficulty:checked ~ form #cell-6-x:checked ~ #cell-8-x:checked ~ #label-computer label[for='cell-7-o'],
#difficulty:checked ~ form #cell-0-x:checked ~ #cell-4-x:checked ~ #label-computer label[for='cell-8-o'],
#difficulty:checked ~ form #cell-2-x:checked ~ #cell-5-x:checked ~ #label-computer label[for='cell-8-o'],
#difficulty:checked ~ form #cell-6-x:checked ~ #cell-7-x:checked ~ #label-computer label[for='cell-8-o'] {
  z-index: 80 !important;
  -webkit-animation: none;
  animation: none;
}

/* if winning move, take it! */
#difficulty:checked ~ form #cell-1-o:checked ~ #cell-2-o:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-3-o:checked ~ #cell-6-o:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-0-o'],
#difficulty:checked ~ form #cell-0-o:checked ~ #cell-2-o:checked ~ #label-computer label[for='cell-1-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-7-o:checked ~ #label-computer label[for='cell-1-o'],
#difficulty:checked ~ form #cell-0-o:checked ~ #cell-1-o:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-5-o:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-6-o:checked ~ #label-computer label[for='cell-2-o'],
#difficulty:checked ~ form #cell-0-o:checked ~ #cell-6-o:checked ~ #label-computer label[for='cell-3-o'],
#difficulty:checked ~ form #cell-4-o:checked ~ #cell-5-o:checked ~ #label-computer label[for='cell-3-o'],
#difficulty:checked ~ form #cell-2-o:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-5-o'],
#difficulty:checked ~ form #cell-3-o:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-5-o'],
#difficulty:checked ~ form #cell-0-o:checked ~ #cell-3-o:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-2-o:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-7-o:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-6-o'],
#difficulty:checked ~ form #cell-1-o:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-7-o'],
#difficulty:checked ~ form #cell-6-o:checked ~ #cell-8-o:checked ~ #label-computer label[for='cell-7-o'],
#difficulty:checked ~ form #cell-0-o:checked ~ #cell-4-o:checked ~ #label-computer label[for='cell-8-o'],
#difficulty:checked ~ form #cell-2-o:checked ~ #cell-5-o:checked ~ #label-computer label[for='cell-8-o'],
#difficulty:checked ~ form #cell-6-o:checked ~ #cell-7-o:checked ~ #label-computer label[for='cell-8-o'] {
  z-index: 99 !important;
  -webkit-animation: none;
  animation: none;
}

/* get center in first move */
#difficulty:checked ~ form #label-computer label[for='cell-4-o'] {
  z-index: 100;
  -webkit-animation: none;
  animation: none;
}

#label-computer,
input:checked ~ input:checked ~ #label-computer,
input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer,
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer,
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer {
  display: none;
}

input:checked ~ #label-computer,
input:checked ~ input:checked ~ input:checked ~ #label-computer, 
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~  #label-computer,
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer {
  display: block;
}

label[for$='-x'],
input:checked ~ input:checked ~ #board label[for$='-x'],
input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'] {
  z-index: 1;
}

input:checked ~ #board label[for$='-x'],
input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'] {
  z-index: -1;
}

#first:checked ~ form #label-computer,
#first:checked ~ form input:checked ~ input:checked ~ #label-computer,
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer,
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer,
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer {
  display: block;
}

#first:checked ~ form input:checked ~ #label-computer,
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ #label-computer, 
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~  #label-computer,
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #label-computer {
  display: none;
}

#first:checked ~ form label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ #board label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'] {
  z-index: -1;
}

#first:checked ~ form input:checked ~ #board label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'],
#first:checked ~ form input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #board label[for$='-x'] {
  z-index: 1;
}

input[id*='-0-']:checked ~ div label[for*='-0-'],
input[id*='-1-']:checked ~ div label[for*='-1-'],
input[id*='-2-']:checked ~ div label[for*='-2-'],
input[id*='-3-']:checked ~ div label[for*='-3-'],
input[id*='-4-']:checked ~ div label[for*='-4-'],
input[id*='-5-']:checked ~ div label[for*='-5-'],
input[id*='-6-']:checked ~ div label[for*='-6-'],
input[id*='-7-']:checked ~ div label[for*='-7-'],
input[id*='-8-']:checked ~ div label[for*='-8-'] {
  display: none !important;
}

input[id*='-0-']:checked ~ #board #tile-0 div,
input[id*='-1-']:checked ~ #board #tile-1 div,
input[id*='-2-']:checked ~ #board #tile-2 div,
input[id*='-3-']:checked ~ #board #tile-3 div,
input[id*='-4-']:checked ~ #board #tile-4 div,
input[id*='-5-']:checked ~ #board #tile-5 div,
input[id*='-6-']:checked ~ #board #tile-6 div,
input[id*='-7-']:checked ~ #board #tile-7 div,
input[id*='-8-']:checked ~ #board #tile-8 div {
  display: block;
}

input[id*='-0-x']:checked ~ #board #tile-0 div::before,
input[id*='-1-x']:checked ~ #board #tile-1 div::before,
input[id*='-2-x']:checked ~ #board #tile-2 div::before,
input[id*='-3-x']:checked ~ #board #tile-3 div::before,
input[id*='-4-x']:checked ~ #board #tile-4 div::before,
input[id*='-5-x']:checked ~ #board #tile-5 div::before,
input[id*='-6-x']:checked ~ #board #tile-6 div::before,
input[id*='-7-x']:checked ~ #board #tile-7 div::before,
input[id*='-8-x']:checked ~ #board #tile-8 div::before {
  content: '\2715';
  color: #0058ff;
  background: rgba(0, 73, 116, 0.1);
}

input[id*='-0-o']:checked ~ #board #tile-0 div::before,
input[id*='-1-o']:checked ~ #board #tile-1 div::before,
input[id*='-2-o']:checked ~ #board #tile-2 div::before,
input[id*='-3-o']:checked ~ #board #tile-3 div::before,
input[id*='-4-o']:checked ~ #board #tile-4 div::before,
input[id*='-5-o']:checked ~ #board #tile-5 div::before,
input[id*='-6-o']:checked ~ #board #tile-6 div::before,
input[id*='-7-o']:checked ~ #board #tile-7 div::before,
input[id*='-8-o']:checked ~ #board #tile-8 div::before {
  content: '\25EF';
  color: #f90606;
  background: rgba(166, 0, 17, 0.1);
}

.tile label:hover {
  cursor: pointer;
}

.tile label::before,
.tile div::before {
  color: #000;
  position: absolute;
  text-align:center;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  font-size: 9.5vmin;
}

.tile div::before {
  padding: 100%;
}

.tile label[for$='-o']:hover::before {
  content: '\25EF';
}

.tile label[for$='-x']:hover::before {
  content: '\2715';
}

#tile-0 {
  -ms-grid-column: 1;
  grid-column: 1;
  -ms-grid-row: 1;
  grid-row: 1;
  border: 1px solid #000;
  border-width: 0 2px 2px 0px;
}
#tile-1 {
  -ms-grid-column: 2;
  grid-column: 2;
  -ms-grid-row: 1;
  grid-row: 1;
  border-bottom: 2px solid #000;
}
#tile-2 {
  -ms-grid-column: 3;
  grid-column: 3;
  -ms-grid-row: 1;
  grid-row: 1;
  border: 1px solid #000;
  border-width: 0 0 2px 2px;
}
#tile-3 {
  -ms-grid-column: 1;
  grid-column: 1;
  -ms-grid-row: 2;
  grid-row: 2;
  border-right: 2px solid #000;
}
#tile-4 {
  -ms-grid-column: 2;
  grid-column: 2;
  -ms-grid-row: 2;
  grid-row: 2;
}
#tile-5 {
  -ms-grid-column: 3;
  grid-column: 3;
  -ms-grid-row: 2;
  grid-row: 2;
  border-left: 2px solid #000;
}
#tile-6 {
  -ms-grid-column: 1;
  grid-column: 1;
  -ms-grid-row: 3;
  grid-row: 3;
  border: 1px solid #000;
  border-width: 2px 2px 0 0;
}
#tile-7 {
  -ms-grid-column: 2;
  grid-column: 2;
  -ms-grid-row: 3;
  grid-row: 3;
  border-top: 2px solid #000;
}
#tile-8 {
  -ms-grid-column: 3;
  grid-column: 3;
  -ms-grid-row: 3;
  grid-row: 3;
  border: 1px solid #000;
  border-width: 2px 0 0 2px;
}


.scrim {
  background: rgba(255,255,255,0.85);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: none;
  z-index: 9;
}

#message {
  text-align: center;
  font-size: 2rem;
  line-height: 2.2rem;
  font-weight: bold;
}

#message::before {
  content: "Ничья!"
}

#message input {
  background: #000;
  color: #fff;
  font-size: 1rem;
  padding: 0.5rem 1.75rem;
  margin: auto auto;
  margin-top: 2rem;
}

input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ input:checked ~ #end,
#cell-0-x:checked ~ #cell-1-x:checked ~ #cell-2-x:checked ~ #end,
#cell-3-x:checked ~ #cell-4-x:checked ~ #cell-5-x:checked ~ #end,
#cell-6-x:checked ~ #cell-7-x:checked ~ #cell-8-x:checked ~ #end,
#cell-0-x:checked ~ #cell-3-x:checked ~ #cell-6-x:checked ~ #end,
#cell-1-x:checked ~ #cell-4-x:checked ~ #cell-7-x:checked ~ #end,
#cell-2-x:checked ~ #cell-5-x:checked ~ #cell-8-x:checked ~ #end,
#cell-0-x:checked ~ #cell-4-x:checked ~ #cell-8-x:checked ~ #end,
#cell-2-x:checked ~ #cell-4-x:checked ~ #cell-6-x:checked ~ #end,
#cell-0-o:checked ~ #cell-1-o:checked ~ #cell-2-o:checked ~ #end,
#cell-3-o:checked ~ #cell-4-o:checked ~ #cell-5-o:checked ~ #end,
#cell-6-o:checked ~ #cell-7-o:checked ~ #cell-8-o:checked ~ #end,
#cell-0-o:checked ~ #cell-3-o:checked ~ #cell-6-o:checked ~ #end,
#cell-1-o:checked ~ #cell-4-o:checked ~ #cell-7-o:checked ~ #end,
#cell-2-o:checked ~ #cell-5-o:checked ~ #cell-8-o:checked ~ #end,
#cell-0-o:checked ~ #cell-4-o:checked ~ #cell-8-o:checked ~ #end,
#cell-2-o:checked ~ #cell-4-o:checked ~ #cell-6-o:checked ~ #end {
  display: block;
}

#cell-0-x:checked ~ #cell-1-x:checked ~ #cell-2-x:checked ~ #end #message::before,
#cell-3-x:checked ~ #cell-4-x:checked ~ #cell-5-x:checked ~ #end #message::before,
#cell-6-x:checked ~ #cell-7-x:checked ~ #cell-8-x:checked ~ #end #message::before,
#cell-0-x:checked ~ #cell-3-x:checked ~ #cell-6-x:checked ~ #end #message::before,
#cell-1-x:checked ~ #cell-4-x:checked ~ #cell-7-x:checked ~ #end #message::before,
#cell-2-x:checked ~ #cell-5-x:checked ~ #cell-8-x:checked ~ #end #message::before,
#cell-0-x:checked ~ #cell-4-x:checked ~ #cell-8-x:checked ~ #end #message::before,
#cell-2-x:checked ~ #cell-4-x:checked ~ #cell-6-x:checked ~ #end #message::before {
  content: "Ваша победа!";
}

#cell-0-o:checked ~ #cell-1-o:checked ~ #cell-2-o:checked ~ #end #message::before,
#cell-3-o:checked ~ #cell-4-o:checked ~ #cell-5-o:checked ~ #end #message::before,
#cell-6-o:checked ~ #cell-7-o:checked ~ #cell-8-o:checked ~ #end #message::before,
#cell-0-o:checked ~ #cell-3-o:checked ~ #cell-6-o:checked ~ #end #message::before,
#cell-1-o:checked ~ #cell-4-o:checked ~ #cell-7-o:checked ~ #end #message::before,
#cell-2-o:checked ~ #cell-5-o:checked ~ #cell-8-o:checked ~ #end #message::before,
#cell-0-o:checked ~ #cell-4-o:checked ~ #cell-8-o:checked ~ #end #message::before,
#cell-2-o:checked ~ #cell-4-o:checked ~ #cell-6-o:checked ~ #end #message::before {
  content: "Компьютер победил!";
}