CSS color theme that applies to all form elements inside .theme-dark scope

dark-form-theme-scaffold.css

/* ===================================================================
   Universal Dark Theme Form Stylesheet
   - Applies to all form elements inside .theme-dark scope
   - Modular, safe, and override-friendly
=================================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code&display=swap');

/* === Root Class for Theming Scope === */
.theme-dark {
  font-family: 'Fira Code', monospace;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  background-color: #000;
  color: #facc15;
}

/* === Inputs, Textareas, Selects === */
.theme-dark input:not([type="hidden"]):not([type="file"]),
.theme-dark select,
.theme-dark textarea {
  background-color: #000;
  color: #facc15;
  border: 1px solid #facc15;
  border-radius: 6px;
  accent-color: #facc15;
  padding: 0.5rem;
  transition: all 0.3s ease;
}

/* === Buttons === */
.theme-dark button,
.theme-dark input[type="submit"],
.theme-dark input[type="button"] {
  background-color: #facc15;
  color: #000;
  border: 1px solid #facc15;
  padding: 0.5rem 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-dark button:hover,
.theme-dark input[type="submit"]:hover,
.theme-dark input[type="button"]:hover {
  background-color: #eab308;
}

/* === Disabled State === */
.theme-dark input:disabled,
.theme-dark select:disabled,
.theme-dark textarea:disabled {
  background-color: #111;
  color: #777;
  border-color: #333;
}

/* === Focus State === */
.theme-dark input:focus,
.theme-dark select:focus,
.theme-dark textarea:focus {
  border-color: #eab308;
  box-shadow: 0 0 0 2px #eab30855;
  outline: none;
}

/* === Labels, Fieldset, Legend === */
.theme-dark label,
.theme-dark fieldset,
.theme-dark legend {
  color: #facc15;
  font-weight: bold;
  border-color: #facc15;
}

/* === Feedback === */
.theme-dark .form-text,
.theme-dark .invalid-feedback,
.theme-dark .valid-feedback {
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.theme-dark .invalid-feedback {
  color: #f87171;
}

.theme-dark .valid-feedback {
  color: #4ade80;
}

/* === File Upload Button === */
.theme-dark input[type="file"]::-webkit-file-upload-button {
  background-color: #facc15;
  color: #000;
  border: 1px solid #facc15;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.theme-dark input[type="file"]::-webkit-file-upload-button:hover {
  background-color: #eab308;
}

/* === Range Slider === */
.theme-dark input[type="range"] {
  background-color: #000;
  border: 1px solid #facc15;
  accent-color: #facc15;
}

/* === Checkbox and Radio === */
.theme-dark input[type="checkbox"],
.theme-dark input[type="radio"] {
  accent-color: #facc15;
}

/* === Select Options === */
.theme-dark option,
.theme-dark optgroup {
  background-color: #000;
  color: #facc15;
}

/* === Progress & Meter === */
.theme-dark progress,
.theme-dark meter {
  background-color: #000;
  color: #facc15;
  border: 1px solid #facc15;
  accent-color: #facc15;
}