frontend/public/index.css

* {
  box-sizing: border-box;
}

:root {
  font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 24px;
  font-weight: 400;

  color: #213547;
  background-color: #ffffff;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
}

a {
  font-weight: 500;
  color: #646cff;
  text-decoration: inherit;
}
a:hover {
  color: #747bff;
}

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

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

.card {
  padding: 2em;
}

#app {
  width: min(900px, 100vw);
  min-height: 100vh;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
}

button {
  border-radius: 4px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #e5e5e5;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}


main {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

label {
  display: flex;
  flex-flow: row wrap;
  align-items: center;
  gap: 0.5rem;
  text-align: left;
}

label.missing > input {
  border: 1px solid red;
}

textarea {
  flex-basis: 100%;
}

details > summary {
  text-align: left;
}

#inner {
  flex: 1;
  display: flex;
  flex-direction: column;
}

#inner > *:first-child {
  min-height: 20ch;
  border: 1px solid black;
  padding: 0.5rem;
}

.result {
  text-align: left;
}

.error {
  text-align: left;
  font-family: monospace;
  color: red;
}

span.word-chip {
  background-color: #222222;
  color: white;
  padding: 2px;
}

span.word-chip.flagged {
  background-color: #dd1111;
  border: 1px solid black;
}

.result-container {
  position: relative;
}

.result-container textarea {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.spinner-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
}

.spinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #3498db;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}