style.css

/* style.css */

:root {
  --primary-color: #2563eb;
  --secondary-color: #6b7280;
  --bg-color: #f9fafb;
  --text-color: #111827;
  --border-radius: 0.375rem;
  --spacing: 1rem;
  --font-family: 'Inter', sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  line-height: 1.5;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing);
}

h1 {
  font-size: 2rem;
  margin-bottom: calc(var(--spacing) * 1.5);
  text-align: center;
  color: var(--primary-color);
}

form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
  margin-bottom: var(--spacing);
}

label {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

select,
input[type="text"],
textarea,
button {
  font-size: 1rem;
  padding: 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: var(--border-radius);
  width: 100%;
}

select:focus,
input:focus,
textarea:focus {
  outline: 2px solid var(--primary-color);
  border-color: var(--primary-color);
}

button {
  background-color: var(--primary-color);
  color: #ffffff;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button:hover:not(:disabled) {
  background-color: #1e40af;
}

#result {
  margin-top: var(--spacing);
  padding: var(--spacing);
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: var(--border-radius);
  min-height: 3rem;
}

@media (min-width: 640px) {
  form {
    flex-direction: row;
    align-items: flex-end;
  }
  form > div {
    flex: 1;
  }
  form > button {
    width: auto;
    flex-shrink: 0;
  }
}

/* Accessibility: High contrast for code labels */
#result[role="alert"] {
  border-left: 4px solid var(--primary-color);
}

/* Visually hidden for screen reader announcements */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}