/* =========================================================
   Form controls: shadcn-style inputs, textareas, selects,
   checkboxes, field-wrapping labels. Works on both light
   and dark surfaces (dark auth pages inherit via --on-dark-*
   overrides applied at the auth-page section scope).
   ========================================================= */

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-field__label {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.6875rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted-foreground);
}

.form-field__required {
  color: var(--brand-teal);
  font-size: 0.75rem;
  line-height: 1;
}

.form-field__help {
  margin: 0;
  font-size: var(--fs-xs);
  color: var(--color-muted-foreground);
  line-height: var(--lh-snug);
}

.form-field--invalid .form-field__help {
  color: var(--color-destructive);
}

/* --- Text input / textarea / select base --------------------------- */

.form-input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-family: var(--font-text);
  font-size: var(--fs-sm);
  font-weight: var(--font-weight-text);
  line-height: 1.4;
  letter-spacing: var(--tracking-body);
  color: var(--color-foreground);
  background: color-mix(in oklch, var(--color-foreground) 3%, transparent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition:
    border-color var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease);
  appearance: none;
}

.form-input::placeholder {
  color: var(--color-muted-foreground);
  opacity: 0.7;
}

.form-input:hover {
  border-color: color-mix(in oklch, var(--color-border) 60%, var(--color-foreground));
}

.form-input:focus-visible {
  border-color: var(--brand-teal);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--brand-teal) 20%, transparent);
  background: color-mix(in oklch, var(--color-foreground) 5%, transparent);
}

.form-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-input[aria-invalid="true"] {
  border-color: var(--color-destructive);
}
.form-input[aria-invalid="true"]:focus-visible {
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--color-destructive) 20%, transparent);
}

.form-input--textarea {
  min-height: 6rem;
  resize: vertical;
  line-height: 1.5;
}

/* --- Select: shadcn-inspired custom listbox ------------------------
   Native <select> option chrome is unstylable, so the PHP component
   renders a hidden real <select> plus a custom trigger + popover
   managed by the formSelect Alpine module. The trigger inherits
   .form-input styling so it matches every other input in the form. */

.form-select {
  position: relative;
  display: block;
}

.form-select__native {
  /* Keep it in the tab order "passively" - visually gone, but its
     value ships with the form on submit. tabindex=-1 on the element
     itself ensures keyboard focus lands on the custom button. */
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
  pointer-events: none;
}

/* Trigger button - looks exactly like .form-input, adds chevron slot */
.form-select__button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.625rem;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.form-select__button.is-open {
  border-color: var(--brand-teal);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--brand-teal) 20%, transparent);
  background: color-mix(in oklch, var(--color-foreground) 5%, transparent);
}

.form-select__button.is-empty .form-select__label {
  color: var(--color-muted-foreground);
  opacity: 0.7;
}

.form-select__label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.form-select__chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted-foreground);
  transition: transform var(--dur-fast) var(--ease);
  flex-shrink: 0;
}

.form-select__button.is-open .form-select__chevron {
  transform: rotate(180deg);
  color: var(--brand-teal);
}

/* Popover listbox - floats below trigger, matches the surrounding
   surface palette. Uses tokenized foreground/border so it stays legible
   whether the form sits on a light glass strip or the dark auth card. */
.form-select__popover {
  position: absolute;
  top: calc(100% + 0.375rem);
  left: 0;
  right: 0;
  z-index: 60;
  margin: 0;
  padding: 0.25rem;
  list-style: none;
  max-height: 14rem;
  overflow-y: auto;
  color: var(--color-foreground);
  background: color-mix(in oklch, var(--surface-dark-999, #0a0a0c) 92%, transparent);
  border: 1px solid color-mix(in oklch, var(--on-dark-foreground) 12%, transparent);
  border-radius: var(--radius-md);
  box-shadow:
    0 1px 0 color-mix(in oklch, var(--on-dark-foreground) 8%, transparent) inset,
    0 20px 40px -14px rgb(0 0 0 / 45%);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  /* Readable on-dark palette inside the popover regardless of page context. */
  --color-foreground: var(--on-dark-foreground);
  --color-muted-foreground: var(--on-dark-muted-foreground);
}

.form-select__popover--enter {
  transition:
    opacity var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}
.form-select__popover--enter-start {
  opacity: 0;
  transform: translateY(-4px);
}
.form-select__popover--enter-end {
  opacity: 1;
  transform: translateY(0);
}

.form-select__option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.625rem;
  border-radius: calc(var(--radius-md) - 2px);
  font-size: var(--fs-sm);
  color: var(--color-foreground);
  cursor: pointer;
  user-select: none;
  transition:
    background var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

.form-select__option.is-highlighted {
  background: color-mix(in oklch, var(--color-foreground) 10%, transparent);
}

.form-select__option.is-selected {
  color: var(--brand-teal);
  background: color-mix(in oklch, var(--brand-teal) 12%, transparent);
}

.form-select__option.is-selected.is-highlighted {
  background: color-mix(in oklch, var(--brand-teal) 18%, transparent);
}

.form-select__option-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.form-select__option-check {
  display: inline-flex;
  align-items: center;
  color: var(--brand-teal);
  flex-shrink: 0;
}

/* Custom scrollbar for long option lists (Webkit + Firefox). */
.form-select__popover {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in oklch, var(--on-dark-foreground) 20%, transparent) transparent;
}
.form-select__popover::-webkit-scrollbar { width: 8px; }
.form-select__popover::-webkit-scrollbar-thumb {
  background: color-mix(in oklch, var(--on-dark-foreground) 20%, transparent);
  border-radius: 999px;
}

/* --- Checkbox ------------------------------------------------------ */

.form-check {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  cursor: pointer;
  user-select: none;
  font-size: var(--fs-sm);
  color: var(--color-foreground);
}

.form-check__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.form-check__box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.125rem;
  height: 1.125rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: color-mix(in oklch, var(--color-foreground) 3%, transparent);
  color: transparent;
  transition:
    background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
  flex-shrink: 0;
}

.form-check__input:checked + .form-check__box {
  background: var(--brand-teal);
  border-color: var(--brand-teal);
  color: var(--surface-dark-999);
}

.form-check__input:focus-visible + .form-check__box {
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--brand-teal) 25%, transparent);
}

.form-check__label {
  color: var(--color-foreground);
}

/* --- Form stack / row layout --------------------------------------- */

.form-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 540px) {
  .form-row { grid-template-columns: 1fr; }
}

.form-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.form-actions__split {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-sm);
}

.form-actions .btn { width: 100%; justify-content: center; }

.form-legal {
  font-size: var(--fs-xs);
  color: var(--color-muted-foreground);
  line-height: var(--lh-snug);
  margin: 0;
}

.form-legal a {
  color: var(--color-foreground);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.form-legal a:hover { color: var(--brand-teal); }