:root {
  --primary-color: #29a395;
  --shadow-color: #29a3a3;
  --text-color: #262626;
  --text-color-contrast: #fdfdfd;
  --background-color: #f2f2f2;
}

body {
  font-family: "Source Sans Pro", sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

p {
  margin: 0;
}

footer {
  padding: 1em;
  margin-top: 2em;
  text-align: center;
}

footer img {
  width: 2rem;
}

.container {
  padding: 2em 1em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3em;
}

.instructions {
  font-size: 2em;
  user-select: none;
  text-align: center;
}

.counter {
  font-family: "Nanum Gothic Coding", monospace;
  font-size: 6em;
  line-height: 1;
  user-select: none;
}

.btn {
  font-size: 2em;
  padding: 10px;
  border: 1px solid var(--primary-color);
  margin: 0 0.25em;
  background-color: var(--primary-color);
  color: var(--text-color-contrast);
  line-height: 1;
  border-radius: 5px;
  box-shadow: 0 0 5px var(--shadow-color);
}

.lighting-light {
  display: inline;
}

.lighting-dark {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #23907e;
    --shadow-color: #239070;
    --text-color: #28a48f;
    --text-color-contrast: #0f3e36;
    --background-color: #0a2924;
  }

  .lighting-light {
    display: none;
  }

  .lighting-dark {
    display: inline;
  }
}