/* Form: labelled fields, fields side by side in a row, a checkbox tile,
   radio cards, their error text, the error summary, the notices for an
   unavailable form or a failed send, and a control inline with its submit
   button. An error is text naming the field and the fix, in the danger
   colour, never colour alone. */

.form {
  max-inline-size: var(--measure);
}

.form__fieldset {
  --stack-space: var(--space-m);
  min-inline-size: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xs);
}

.form__field label {
  font-weight: 600;
}

.form__control {
  min-block-size: var(--tap-min);
  padding: var(--space-2xs) var(--space-xs);
  border: 1px solid var(--border-control);
  border-radius: var(--radius);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  font: inherit;
  transition: border-color var(--dur-fast) var(--ease-standard);
}

.form__control:hover {
  border-color: var(--text-muted);
}

.form__control:focus-visible {
  border-color: var(--accent);
}

.form__control:active {
  border-color: var(--accent);
}

.form__control:disabled {
  background-color: var(--bg-cell-empty);
  color: var(--text-muted);
  cursor: not-allowed;
}

.form__control[aria-invalid="true"] {
  border-color: var(--danger);
}

/* A checkbox beside its label, as in the evaluation attestation: the box
   keeps the tap size, the label wraps beside it and the error goes below. */
.form__field--check {
  display: grid;
  grid-template-columns: var(--tap-min) 1fr;
  align-items: start;
  column-gap: var(--space-3xs);
  padding: var(--space-3xs) var(--space-xs) var(--space-3xs) var(--space-3xs);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  background-color: var(--bg-elevated);
  transition: border-color var(--dur-fast) var(--ease-standard);
}

.form__field--check:has(.form__check:checked) {
  border-color: var(--accent);
  background-color: var(--bg-surface);
}

.form__field--check:has(.form__check[aria-invalid="true"]) {
  border-color: var(--danger);
}

.form__field--check label {
  padding-block: var(--space-2xs);
  font-weight: 400;
}

.form__field--check .form__error {
  grid-column: 2;
  padding-block-end: var(--space-2xs);
}

/* Fields side by side, as name and email on /contact: each wraps under the
   other when the row cannot hold both. */
.form__row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m) var(--space-s);
}

.form__row > .form__field {
  flex: 1 1 13rem;
  min-inline-size: 0;
}

/* Radio cards, as the /contact topic: every choice visible, the whole card
   is the tap target, the selected one outlined in the accent. */
.form__choices {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  min-inline-size: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.form__legend {
  padding: 0;
  margin-block-end: var(--space-2xs);
  font-weight: 600;
}

.form__choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: var(--space-2xs);
}

.form__choice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  min-block-size: var(--tap-min);
  padding: var(--space-xs) var(--space-s);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  background-color: var(--bg-elevated);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-standard);
}

.form__choice:hover {
  border-color: var(--border-control);
}

.form__choice:has(.form__radio:checked) {
  border-color: var(--accent);
  background-color: var(--bg-surface);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.form__choice:has(.form__radio:disabled) {
  color: var(--text-muted);
  cursor: not-allowed;
}

.form__choices[aria-invalid="true"] .form__choice {
  border-color: var(--danger);
}

.form__choice-label {
  display: block;
  font-weight: 600;
}

.form__choice-hint {
  display: block;
  color: var(--text-muted);
  font-size: var(--step--1);
}

.form__radio {
  display: grid;
  flex-shrink: 0;
  place-content: center;
  inline-size: 1.25rem;
  block-size: 1.25rem;
  margin: 0.2em 0 0;
  appearance: none;
  border: 2px solid var(--border-control);
  border-radius: var(--radius-pill);
  background-color: var(--bg-surface);
  cursor: pointer;
}

.form__radio:checked {
  border-color: var(--accent);
}

.form__radio:checked::before {
  content: "";
  inline-size: 0.625rem;
  block-size: 0.625rem;
  border-radius: var(--radius-pill);
  background-color: var(--accent);
}

.form__radio:disabled {
  cursor: not-allowed;
}

/* The input keeps the tap size as its hit area and draws a smaller box
   inside it: a native checkbox scaled to the tap size renders blurred. */
.form__check {
  display: grid;
  place-content: center;
  inline-size: var(--tap-min);
  block-size: var(--tap-min);
  margin: 0;
  appearance: none;
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
}

.form__check::before {
  content: "";
  grid-area: 1 / 1;
  inline-size: 1.25rem;
  block-size: 1.25rem;
  border: 2px solid var(--border-control);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  transition: background-color var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard);
}

.form__check:hover::before {
  border-color: var(--text-muted);
}

.form__check:checked::before {
  border-color: var(--accent);
  background-color: var(--accent);
}

.form__check:checked::after {
  content: "";
  grid-area: 1 / 1;
  justify-self: center;
  inline-size: 0.375rem;
  block-size: 0.75rem;
  margin-block-start: -0.125rem;
  border: solid var(--on-accent);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form__check:disabled::before {
  border-color: var(--border-subtle);
  background-color: var(--bg-cell-empty);
}

/* Forced colors drop the drawn controls' backgrounds: use the native ones. */
@media (forced-colors: active) {
  .form__check,
  .form__radio {
    appearance: auto;
  }

  .form__check::before,
  .form__check::after,
  .form__radio::before {
    content: none;
  }
}

.form__check:disabled {
  cursor: not-allowed;
}

.form__error {
  color: var(--danger);
  font-size: var(--step--1);
}

.form__summary {
  padding: var(--space-m);
  border: 1px solid var(--danger);
  border-radius: var(--radius-card);
  background-color: var(--danger-soft);
  color: var(--danger);
}

.form__summary a {
  color: var(--danger);
}

.form__summary-title {
  font-size: var(--step-0);
}

.form__notice {
  max-inline-size: var(--measure);
  padding: var(--space-m);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  background-color: var(--bg-elevated);
  color: var(--text-secondary);
}

.form__notice[data-kind="error"] {
  border-color: var(--danger);
  background-color: var(--danger-soft);
  color: var(--danger);
}

/* A control beside its submit button, as in the directory search: the
   control takes the free width and the button wraps under it when narrow. */
.form__inline > .form__control {
  flex: 1 1 16em;
  min-inline-size: 0;
}

.form__control[type="search"] {
  appearance: none;
}