:root {
  font-family: Arial, Helvetica, sans-serif;
  color: #17202a;
  background: #f5f7fa;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
}

main {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

form {
  width: min(100%, 32rem);
  padding: clamp(1.5rem, 6vw, 3rem);
  text-align: center;
  background: #ffffff;
  border: 2px solid #d9e0e8;
  border-radius: 1.25rem;
  box-shadow: 0 0.75rem 2.5rem rgba(23, 32, 42, 0.1);
}

.language-switch {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.65rem;
  margin: -0.5rem 0 1.25rem;
  font-size: 1.1rem;
  font-weight: 700;
}

.language-switch a {
  padding: 0.45rem;
  color: #28598f;
  border-radius: 0.35rem;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2rem;
}

.language-switch a.active {
  color: #17202a;
  text-decoration: none;
}

.language-switch a:focus-visible {
  outline: 4px solid #7ec8ff;
  outline-offset: 1px;
}

h1 {
  margin: 0 0 1.75rem;
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1.1;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  width: 100%;
  display: block;
  margin-bottom: 1rem;
  font-size: clamp(1.2rem, 4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
}

.code-entry {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: clamp(0.45rem, 2.5vw, 0.9rem);
}

.code-entry input {
  display: block;
  width: 100%;
  min-width: 0;
  min-height: 5rem;
  padding: 0.5rem 0.1rem;
  color: #111111;
  background: #ffffff;
  border: 0;
  border-bottom: 5px solid #526170;
  border-radius: 0;
  font: 700 clamp(2.5rem, 12vw, 4rem) / 1 monospace;
  text-align: center;
}

.code-entry input:focus {
  border-bottom-color: #005fcc;
  outline: 4px solid #b8d9ff;
  outline-offset: 2px;
}

.hint {
  margin: 0.65rem 0 1.25rem;
  color: #526170;
  font-size: 1.1rem;
}

.message {
  margin: 0 0 1.25rem;
  padding: 0.9rem;
  color: #7a1c13;
  background: #fff0ed;
  border: 2px solid #d34131;
  border-radius: 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
}

button {
  width: 100%;
  min-height: 5rem;
  padding: 1rem;
  color: #ffffff;
  background: #076b35;
  border: 0;
  border-radius: 0.75rem;
  box-shadow: 0 0.3rem 0 #034c24;
  font-size: clamp(1.5rem, 6vw, 2rem);
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  background: #045a2b;
}

button:focus-visible {
  outline: 5px solid #7ec8ff;
  outline-offset: 4px;
}

button:active {
  box-shadow: none;
  transform: translateY(0.3rem);
}

@media (max-width: 25rem) {
  main {
    padding: 0.75rem;
  }

  form {
    padding: 1.25rem;
  }

  .code-entry {
    gap: 0.35rem;
  }

  .code-entry input {
    min-height: 4.25rem;
    font-size: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  button:active {
    transform: none;
  }
}