html {
  box-sizing: border-box;
  font-size: 16px;
}
*, *::before, *::after {
  box-sizing: border-box;
}
li {
  list-style: none;
}
body {
  margin: 0;
  line-height: normal;
}
h1 {
  margin: 20px 0;
  font-size: 2rem;
  font-weight: bold;
}
.wrapper {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 10px;
  text-align: center;
}
.game-container {
  padding: 60px 0;
}
.message-container {
  margin-bottom: 20px;
  font-size: 1.25rem;
  font-weight: bold;
}
.batsu {
  color: #00b0f0;
}
.maru {
  color: #ff0000;
}
.js-hidden {
  display: none;
}
.squares-container {
  margin: 0 auto;
  width: 202px;
}
.squares-box {
  width: 202px;
  height: 202px;
  display: flex;
  flex-wrap: wrap;
  border: solid 2px #333;
}
.square {
  position: relative;
  width: calc(198px / 3);
  height: calc(198px / 3);
  border: solid 2px #333;
}
.js-maru-checked::before {
  content: '';
  width: 50px;
  height: 50px;
  border: solid 8px #ff0000;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.js-batsu-checked::before {
  content: '';
  width: 50px;
  height: 8px;
  margin: auto;
  background-color: #00b0f0;
  border-radius: 4px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
}
.js-batsu-checked::after {
  content: '';
  width: 8px;
  height: 50px;
  margin: auto;
  background-color: #00b0f0;
  border-radius: 4px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
}
.btn-container {
  padding-top: 40px;
}
.btn {
  display: inline-block;
  width: 150px;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
}
.btn-reset {
  color: #fff;
  background-color: #ffc000;
  font-weight: bold;
}
.btn-reset:hover {
  background-color: #ffd347;
  transition-duration: 0.4s;
}

/* JS連動 */
.js-unclickable {
  pointer-events: none;
}
.js-highLight {
  background-color: #fff2cc;
}