body {
  font-family: Arial, sans-serif;
  margin: 1rem;
  background: #ffffff;
  color: #000000;
  font-size: 1rem;
}

.app {
  max-width: 600px;
  margin: auto;
}

h1 {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.form input[type="number"] {
  width: 100%;
  box-sizing: border-box;
}

.form label {
  display: block;
  margin: 1rem 0;
  font-size: 1.1rem;
}

.form button {
  width: 100%;
  background-color: #04AA6D;
}

.result button {
  background-color: #01baf2;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.intro {
  text-align: center;
}

.generate-button {
  margin-bottom: 0.75rem;
}

.form,
.result {
  max-width: 90%;
  margin: 1rem auto;
  padding: 1.5rem;
  background: #f5f5f5;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

footer {
  margin-top: 3rem;
  text-align: center;
  font-size: 0.9rem;
  color: #666;
}

footer a {
  color: inherit;
  text-decoration: underline;
}

.form input[type="number"] {
  font-size: 1rem;
  padding: 0.4rem;
  width: 100%;
  margin-top: 0.4rem;
  background: #ffffff;
  color: #000000;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.result-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.result-row input {
  max-width: 100%;
  width: 100%;
}

input#customSymbols {
  font-size: 1rem;
  padding: 0.4rem;
  background: #ffffff;
  color: #000000;
  border: 1px solid #ccc;
  border-radius: 4px;
  flex: 1;
}

@media (max-width: 400px) {
  .result-row {
    gap: 0.25rem;
  }
}

.result input {
  font-size: 1.1rem;
  padding: 0.7rem;
  font-family: monospace;
  background: #ffffff;
  color: #000000;
  border: 1px solid #ccc;
  border-radius: 4px;
  width: 100%;
  box-sizing: border-box;
}

.visually-hidden {
  position: absolute;
  left: -9999px;
}

button {
  padding: 0.7rem;
  font-size: 1.1rem;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
}

button:hover {
  background: #555;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  body {
    background: #121212;
    color: #f0f0f0;
  }

  .form,
  .result {
    background: #1e1e1e;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  }

  .form input[type="number"],
  .result input {
    background: #2e2e2e;
    color: #f0f0f0;
    border: 1px solid #555;
  }

  footer {
    color: #aaa;
  }

  input#customSymbols {
    background: #2e2e2e;
    color: #f0f0f0;
    border: 1px solid #555;
  }
}

input[type="checkbox"] {
  width: 1.4rem;
  height: 1.4rem;
  accent-color: #04AA6D;
  cursor: pointer;
  margin-right: 0.5rem;
  vertical-align: middle;
}

@media (max-width: 400px) {
  input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
  }
}

.checkbox-row label {
  font-size: 1.1rem;
  cursor: pointer;
}