@charset "UTF-8";
* {
  box-sizing: border-box;
}

html {
  font-size: 6.25vmax;
}
@media (max-width: 992px) {
  html {
    font-size: 60px;
  }
}

body {
  min-height: 100vh;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: #222;
  background-color: #eee;
  font-size: 0.24rem;
  font-family: "Aboreto", sans-serif;
}

.card {
  width: 5rem;
  height: 1.8rem;
  padding: 0.3rem 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.2rem;
  line-height: 1.5;
  border: 1px solid;
  border-radius: 0.3rem;
  box-shadow: 3px 3px 0 3px #222;
  cursor: crosshair;
  overflow: hidden;
}

.arrow-btn {
  flex-shrink: 0;
  width: 0.7rem;
  height: 0.7rem;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #eee;
  background-color: #222;
  border-radius: 50%;
  cursor: pointer;
}
.arrow-btn:before {
  content: "→";
}

input[type=checkbox] {
  display: none;
}
input[type=checkbox]:checked ~ .dark-mode-mask {
  transform: scale(50);
}
input[type=checkbox]:checked ~ .toggle-btn {
  background-color: #fff;
}

.dark-mode-mask,
.toggle-btn {
  position: fixed;
  bottom: 0.3rem;
  right: 0.3rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
}

.toggle-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 0.8em;
  color: orange;
  background-color: #222;
  cursor: pointer;
  z-index: 1;
  transition: all 0.3s;
  will-change: background-color;
}
.toggle-btn:before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  background-color: inhrit;
  border-radius: inherit;
  animation: pulse 1.2s infinite linear;
  pointer-events: none;
}

.dark-mode-mask {
  pointer-events: none;
  background-color: #fff;
  mix-blend-mode: difference;
  transition: all 0.5s ease;
  will-change: transform;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 #222a;
  }
  40% {
    box-shadow: 0 0 0 0.1rem #2222;
    opacity: 0.7;
  }
  80% {
    box-shadow: 0 0 0 0.15rem #2222;
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}