:root {
  --form-radius: 6px;
  --form-focus-ring: var(--accent);
  --form-error: #dc2626;
  --form-error-bg: rgba(220, 38, 38, 0.08);
  --form-success: #16a34a;
  --form-input-bg: var(--bg);
  --form-input-border: var(--border);
  --form-input-text: var(--text-h);
  --form-label-text: var(--text-h);
  --form-placeholder: var(--text);
  --form-disabled-bg: var(--code-bg);
  --form-transition: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --form-error: #f87171;
    --form-error-bg: rgba(248, 113, 113, 0.1);
    --form-success: #4ade80;
  }
}

/* ------------------------------------------------------------------ */
/*  Form container                                                     */
/* ------------------------------------------------------------------ */

form[id] {
  width: 100%;
  max-width: 36rem;
}

/* ------------------------------------------------------------------ */
/*  Field wrapper                                                      */
/* ------------------------------------------------------------------ */

[data-form-field] {
  margin-bottom: 1.25rem;
}

/* ------------------------------------------------------------------ */
/*  Labels                                                             */
/* ------------------------------------------------------------------ */

.form-label,
[data-form-field] > label {
  display: block;
  margin-bottom: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--form-label-text);
}

.required {
  color: var(--form-error);
  margin-left: 0.125rem;
}

/* ------------------------------------------------------------------ */
/*  Inputs, selects, textareas                                         */
/* ------------------------------------------------------------------ */

.form-control,
[data-form-field] input:not([type="checkbox"]):not([type="radio"]):not([type="hidden"]),
[data-form-field] select,
[data-form-field] textarea {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font: inherit;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--form-input-text);
  background: var(--form-input-bg);
  border: 1px solid var(--form-input-border);
  border-radius: var(--form-radius);
  box-sizing: border-box;
  transition:
    border-color var(--form-transition),
    box-shadow var(--form-transition);
  appearance: none;

  &::placeholder {
    color: var(--form-placeholder);
    opacity: 0.6;
  }

  &:hover:not(:disabled) {
    border-color: var(--accent-border);
  }

  &:focus-visible {
    outline: none;
    border-color: var(--form-focus-ring);
    box-shadow: 0 0 0 3px var(--accent-bg);
  }

  &:disabled {
    background: var(--form-disabled-bg);
    cursor: not-allowed;
    opacity: 0.6;
  }
}

[data-form-field] textarea {
  min-height: 6rem;
  resize: vertical;
}

[data-form-field] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b6375' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

/* ------------------------------------------------------------------ */
/*  Checkboxes & radios                                                */
/* ------------------------------------------------------------------ */

.form-check,
[data-form-field] [role="radiogroup"] > div,
[data-form-field] [role="group"] > div {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.375rem;

  & label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--form-input-text);
  }
}

.form-check-input,
[data-form-field] input[type="checkbox"]:not(.altcha-container *),
[data-form-field] input[type="radio"] {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.1875rem;
  border: 1.5px solid var(--form-input-border);
  background: var(--form-input-bg);
  appearance: none;
  cursor: pointer;
  transition:
    border-color var(--form-transition),
    background var(--form-transition),
    box-shadow var(--form-transition);

  &:hover {
    border-color: var(--accent-border);
  }

  &:focus-visible {
    outline: none;
    border-color: var(--form-focus-ring);
    box-shadow: 0 0 0 3px var(--accent-bg);
  }

  &:checked {
    background: var(--accent);
    border-color: var(--accent);
  }
}

[data-form-field] input[type="checkbox"]:not(.altcha-container *) {
  border-radius: 3px;

  &:checked {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='10'%3E%3Cpath d='M1 5l3 3 7-7' stroke='%23fff' stroke-width='2' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
  }
}

[data-form-field] input[type="radio"] {
  border-radius: 50%;

  &:checked {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='8'%3E%3Ccircle cx='4' cy='4' r='3' fill='%23fff'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
  }
}

/* ------------------------------------------------------------------ */
/*  Fieldsets & legends                                                */
/* ------------------------------------------------------------------ */

[data-form-field] fieldset,
fieldset[data-form-field] {
  border: 1px solid var(--form-input-border);
  border-radius: var(--form-radius);
  padding: 1rem 1.25rem;
  margin: 0;
}

[data-form-field] legend {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--form-label-text);
  padding: 0 0.25rem;
}

/* ------------------------------------------------------------------ */
/*  Validation states                                                  */
/* ------------------------------------------------------------------ */

.is-invalid > input,
.is-invalid > select,
.is-invalid > textarea,
.is-invalid .form-control,
.is-invalid .form-check-input,
input.is-invalid,
select.is-invalid,
textarea.is-invalid {
  border-color: var(--form-error);

  &:focus-visible {
    border-color: var(--form-error);
    box-shadow: 0 0 0 3px var(--form-error-bg);
  }
}

.invalid-feedback {
  display: block;
  min-height: 1.25rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--form-error);
  margin-top: 0.25rem;

  &:empty {
    min-height: 0;
    margin: 0;
  }
}

/* ------------------------------------------------------------------ */
/*  Description text                                                   */
/* ------------------------------------------------------------------ */

.form-text {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--text);
  margin-top: 0.25rem;
}

/* ------------------------------------------------------------------ */
/*  File upload                                                        */
/* ------------------------------------------------------------------ */

[data-form-field] input[type="file"] {
  padding: 0.375rem;
  font-size: 0.875rem;

  &::file-selector-button {
    font: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--form-input-text);
    background: var(--code-bg);
    border: 1px solid var(--form-input-border);
    border-radius: calc(var(--form-radius) - 2px);
    padding: 0.25rem 0.75rem;
    margin-right: 0.75rem;
    cursor: pointer;
    transition:
      background var(--form-transition),
      border-color var(--form-transition);

    &:hover {
      border-color: var(--accent-border);
    }
  }
}

/* ------------------------------------------------------------------ */
/*  Buttons / navigation                                               */
/* ------------------------------------------------------------------ */

.actions,
.form-navigation {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  padding: 0.625rem 1.25rem;
  border-radius: var(--form-radius);
  cursor: pointer;
  text-decoration: none;
  transition:
    background var(--form-transition),
    border-color var(--form-transition),
    box-shadow var(--form-transition);

  &:focus-visible {
    outline: 2px solid var(--form-focus-ring);
    outline-offset: 2px;
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);

  &:hover:not(:disabled) {
    filter: brightness(1.1);
    box-shadow: var(--shadow);
  }

  &:active:not(:disabled) {
    filter: brightness(0.95);
  }
}

.btn-outline-primary {
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--accent-border);

  &:hover:not(:disabled) {
    background: var(--accent-bg);
  }

  &:active:not(:disabled) {
    background: var(--accent-bg);
    filter: brightness(0.95);
  }
}

/* ------------------------------------------------------------------ */
/*  Accessibility                                                      */
/* ------------------------------------------------------------------ */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ------------------------------------------------------------------ */
/*  Combobox plugin                                                    */
/* ------------------------------------------------------------------ */

.combobox {
  position: relative;
}

select[hidden][aria-hidden="true"] {
  display: none !important;
}

.combobox-input-wrap {
  position: relative;
  display: flex;
}

.combobox-input {
  flex: 1;
  padding-right: 2.25rem;
}

.combobox-toggle {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0;
  transition: color var(--form-transition);

  &:hover {
    color: var(--form-input-text);
  }
}

.combobox-listbox {
  position: absolute;
  z-index: 10;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  max-height: 15rem;
  overflow-y: auto;
  margin: 0;
  padding: 0.25rem 0;
  list-style: none;
  background: var(--form-input-bg);
  border: 1px solid var(--form-input-border);
  border-radius: var(--form-radius);
  box-shadow: var(--shadow);
}

.combobox-option {
  padding: 0.5rem 0.75rem;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: background var(--form-transition);

  &:hover,
  &[aria-selected="true"] {
    background: var(--accent-bg);
    color: var(--form-input-text);
  }

  &.is-selected {
    font-weight: 500;
  }
}

.combobox-no-results {
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  color: var(--text);
  font-style: italic;
}

/* ------------------------------------------------------------------ */
/*  ALTCHA captcha plugin                                              */
/* ------------------------------------------------------------------ */

.altcha-container {
  --altcha-max-width: 100%;
}

.altcha-container altcha-widget {
  font-size: inherit;
  line-height: inherit;
}

/* ------------------------------------------------------------------ */
/*  Reduced motion                                                     */
/* ------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}