:root {
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  color-scheme: light dark;
  color: rgba(255, 255, 255, 0.87);
  background-color: #242424;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  display: flex;
  place-items: center;
  min-width: 320px;
  min-height: 100vh;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

#app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
}

.input {
  display: flex;
  align-items: center;
  margin-bottom: 0.5em;
}
input {
  padding: 0.3em 0.5em;
  font-size: 1.1em;
  width: 6em;
  background-color: transparent;
  transition: border-color 0.25s;
}
button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

#light {
  width: 2.5em;
  height: 2.5em;
  border-radius: 50%;
  background-color: #1a1a1a;
  margin-left: .75em;
}
#light.is-valid {
  background-color: #46fd46;
}
#light.is-invalid {
  background-color: #fd3838;
}

.current-node {
  fill: red !important;
}
.accepting-node {
  stroke: yellow;
}

#automaton-selector {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}
#automaton-collection {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 2em 0;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5em;
  margin: 1em;
  border-radius: 8px;
  background-color: #1a1a1a;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1), 0 2px 4px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}
.card:hover {
  background-color: #2a2a2a;
}

@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: #ffffff;
  }
  button {
    background-color: #f9f9f9;
  }
  .accepting-node {
    outline-color: #9370DB;
  }
}