/* Structural CSS for the combobox enhancement. No Bootstrap JS dependency.
   Tune appearance through the --cb-* variables below; defaults are neutral and
   deterministic, derived from --cb-color/--cb-bg rather than an external
   framework. Markup stays framework-agnostic. */

:root {
  --cb-bg: #fff;
  --cb-color: #1f2328;
  --cb-border-color: color-mix(in srgb, var(--cb-color) 16%, var(--cb-bg));
  --cb-border-radius: 0.5rem;
  --cb-focus-color: #2563eb;
  --cb-chip-bg: color-mix(in srgb, var(--cb-focus-color) 10%, var(--cb-bg));
  --cb-chip-color: var(--cb-color);
  --cb-chip-border-color: transparent;
  --cb-chip-border-width: 0px;
  --cb-chip-font-size: 0.875em;
  --cb-chip-border-radius: 0.4286em;
  --cb-picker-bg: var(--cb-bg);
  --cb-option-active-bg: color-mix(in srgb, var(--cb-color) 5%, var(--cb-picker-bg));
  --cb-option-active-color: var(--cb-color);
  --cb-option-selected-bg: color-mix(in srgb, var(--cb-focus-color) 12%, var(--cb-picker-bg));
  --cb-muted-color: color-mix(in srgb, var(--cb-color) 58%, var(--cb-bg));
  --cb-error-color: #dc2626;
  --cb-control-height: 2.375rem;
  --cb-option-min-height: 2rem;
  --cb-check-size: 1em;
}

.cb-source-hidden {
  position: absolute !important;
  inline-size: 1px !important;
  block-size: 1px !important;
  margin: -1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ------------------------------------------------------------------------- */
/* Control geometry — single, multiple and input comboboxes share one system */
/* ------------------------------------------------------------------------- */

.cb-control,
.cb-text-control,
.cb-fallback-input,
.cb-fallback-add {
  box-sizing: border-box;
  min-block-size: var(--cb-control-height);
  border: 1px solid var(--cb-border-color);
  border-radius: var(--cb-border-radius);
  background: var(--cb-bg);
  color: var(--cb-color);
  font: inherit;
}

.cb-text-control,
.cb-fallback-input {
  display: block;
  inline-size: 100%;
  max-inline-size: 100%;
  padding-block: calc((var(--cb-control-height) - 1.625rem) / 2);
  padding-inline: 0.75rem;
}

.cb-text-control:disabled {
  cursor: not-allowed;
}

.cb-control {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
  min-inline-size: 0;
  max-inline-size: 100%;
  padding-block: 0.375rem;
  /* Chips keep the tighter start breathing; the caret side matches text
     inputs and the date-picker field (.75rem) so stacked controls line up. */
  padding-inline-start: 0.5rem;
  padding-inline-end: 0.75rem;
  cursor: text;
}

.cb-control-single {
  flex-wrap: nowrap;
  padding-block: 0;
  padding-inline: 0.75rem;
}

.cb-control:hover,
.cb-text-control:hover {
  border-color: color-mix(in srgb, var(--cb-color) 32%, var(--cb-bg));
}

/* Chips participate directly in the control flex layout so the inter-item gap
   is identical everywhere (including before the search field). */
.cb-chips {
  display: contents;
}

.cb-chips:empty {
  display: none;
}

/* The search input disappears into the control */
.cb-input {
  flex: 1 1 4ch;
  min-inline-size: 4ch;
  max-inline-size: 100%;
  inline-size: auto;
  border: 0;
  outline: 0;
  margin: 0;
  padding: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-overflow: ellipsis;
}

.cb-control-single .cb-input {
  flex-basis: 100%;
  min-inline-size: 0;
}

/* Select-based controls read as a picker, not a free-text field: a decorative
   caret drawn from currentColor. Pure CSS flex item (no injected SVG, no extra
   button), so it flows with the control and survives forced colors. Absent from
   .cb-text-control (input+datalist stays a real autocomplete). The chevron is
   deliberately small with an optical vertical correction (the rotated corner's
   visual mass sits below its box center). Up/down chevrons are not mirrored
   under RTL: as a flex item after the input, position already follows
   inline-end via direction, so the shape stays identical. The caret is a
   stable trailing affordance: margin-inline-start:auto pins it to the
   inline-end edge in single and multiple controls alike (the control's own
   padding-inline provides the edge breathing, the flex gap separates it from
   the content). In a wrapped multiple it lives on the last line: it belongs
   to the whole control, not to one row. */
.cb-control::after {
  content: "";
  flex: none;
  inline-size: 6px;
  block-size: 6px;
  margin-inline-start: auto;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-1px) rotate(45deg);
  opacity: 0.6;
  pointer-events: none;
}

.cb-control:has([aria-expanded="true"])::after {
  transform: translateY(1px) rotate(225deg);
}

.cb-input::placeholder,
.cb-text-control::placeholder,
.cb-fallback-input::placeholder {
  color: var(--cb-muted-color);
  opacity: 1;
}

/* ------------------------------------------------------------------------- */
/* Chips                                                                    */
/* ------------------------------------------------------------------------- */

.cb-chip {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: 0.2857em;
  flex: 0 1 auto;
  min-inline-size: 0;
  min-block-size: 1.7143em;
  max-inline-size: 100%;
  padding-block: 0;
  padding-inline-start: 0.5714em;
  padding-inline-end: 0.1429em;
  border: var(--cb-chip-border-width) solid var(--cb-chip-border-color);
  border-radius: var(--cb-chip-border-radius);
  background: var(--cb-chip-bg);
  color: var(--cb-chip-color);
  font-size: var(--cb-chip-font-size);
  line-height: 1.4;
}

.cb-chip-label {
  flex: 1 1 auto;
  min-inline-size: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Without a remove button (locked/disabled selection) the end padding
   otherwise reserved for the button must fall back to the symmetric value. */
.cb-chip:not(:has(.cb-chip-remove)) {
  padding-inline-end: 0.5714em;
}

.cb-chip .cb-chip-remove {
  appearance: none;
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  inline-size: 1.4286em;
  block-size: 1.4286em;
  margin-inline-start: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.cb-chip .cb-chip-remove > svg {
  inline-size: 1em;
  block-size: 1em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

.cb-chip .cb-chip-remove:hover,
.cb-chip .cb-chip-remove:focus-visible {
  background: rgb(0 0 0 / 0.08);
}

@supports (color: color-mix(in srgb, red 50%, blue)) {
  .cb-chip .cb-chip-remove:hover,
  .cb-chip .cb-chip-remove:focus-visible {
    background: color-mix(in srgb, currentColor 12%, transparent);
  }
}

.cb-chip:focus-visible {
  outline: 2px solid var(--cb-focus-color);
  outline-offset: -2px;
}

.cb-chip .cb-chip-remove:focus-visible {
  outline: 2px solid var(--cb-focus-color);
  outline-offset: -2px;
}

/* ------------------------------------------------------------------------- */
/* Focus — form-control halo on the field, inner ring on compact targets      */
/* ------------------------------------------------------------------------- */

/* Focused field/control = accent border + soft outer ring, the form-control
   convention. The control only draws the ring while the search input itself is
   focused: a focused chip or remove button uses its own inner ring below, so
   the control and the small target never light up together. */
.cb-text-control:focus-visible,
.cb-fallback-input:focus-visible,
.cb-control:has(.cb-input:focus-visible) {
  border-color: var(--cb-focus-color);
  outline: 0;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--cb-focus-color) 20%, transparent);
}

/* Open state reflection without a parallel JS state model */
.cb-control:has([aria-expanded="true"]) {
  border-color: var(--cb-focus-color);
}

/* ------------------------------------------------------------------------- */
/* Picker / popover — natural continuation of the control                   */
/* ------------------------------------------------------------------------- */

.cb-popover {
  box-sizing: border-box;
  inset: auto;
  margin: 0;
  position: fixed;
  max-block-size: min(20rem, var(--available-height, 50vh));
  padding: 0.375rem;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--cb-border-color);
  border-radius: var(--cb-border-radius);
  background: var(--cb-picker-bg);
  color: var(--cb-color);
  box-shadow: 0 0.5rem 1.5rem rgb(15 23 42 / 0.12);
}

.cb-popover::backdrop {
  background: transparent;
}

.cb-listbox {
  display: grid;
  min-inline-size: 0;
  gap: 0.125rem;
}

.cb-option-group {
  display: grid;
  min-inline-size: 0;
  gap: 0.125rem;
}

/* ------------------------------------------------------------------------- */
/* Options — stable geometry, active vs selected distinctly                  */
/* ------------------------------------------------------------------------- */

.cb-option,
.cb-empty,
.cb-group {
  box-sizing: border-box;
  inline-size: 100%;
  min-inline-size: 0;
  padding-block: 0.5rem;
  padding-inline: 0.75rem;
}

.cb-option,
.cb-empty {
  min-block-size: var(--cb-option-min-height);
  border-radius: calc(var(--cb-border-radius) * 0.75);
}

.cb-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75em;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: start;
  cursor: pointer;
  user-select: none;
}

.cb-option-label {
  flex: 1 1 auto;
  min-inline-size: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Active is the navigation cursor, not the chosen value: neutral hover.
   Selected keeps the soft accent and the explicit check mark. The two combine
   into a slightly stronger soft accent, never a full accent fill. */
.cb-option:is(:hover, [data-active]) {
  background: var(--cb-option-active-bg);
  color: var(--cb-option-active-color);
}

.cb-option[aria-selected="true"] {
  background: var(--cb-option-selected-bg);
}

.cb-option[aria-selected="true"]:is(:hover, [data-active]) {
  background: color-mix(in srgb, var(--cb-focus-color) 18%, var(--cb-picker-bg));
  color: var(--cb-option-active-color);
}

.cb-option[aria-selected="true"]::after {
  content: "";
  flex: 0 0 auto;
  inline-size: var(--cb-check-size);
  block-size: var(--cb-check-size);
  margin-inline-start: auto;
  color: var(--cb-focus-color);
  background: currentColor;
  -webkit-mask:
    url("data:image/svg+xml,%3Csvg%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3E%3Cpath%20d='M5%2012l4%204L19%206'%20fill='none'%20stroke='%23000'%20stroke-width='2.25'%20stroke-linecap='round'%20stroke-linejoin='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
  mask:
    url("data:image/svg+xml,%3Csvg%20viewBox='0%200%2024%2024'%20xmlns='http://www.w3.org/2000/svg'%3E%3Cpath%20d='M5%2012l4%204L19%206'%20fill='none'%20stroke='%23000'%20stroke-width='2.25'%20stroke-linecap='round'%20stroke-linejoin='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
}

.cb-option[aria-disabled="true"],
.cb-option[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ------------------------------------------------------------------------- */
/* Empty / loading / error / create states — treated as real picker rows     */
/* ------------------------------------------------------------------------- */

.cb-empty {
  display: flex;
  align-items: center;
  color: var(--cb-muted-color);
  overflow-wrap: anywhere;
}

.cb-empty.cb-error {
  color: var(--cb-error-color);
}

.cb-group {
  color: var(--cb-muted-color);
  font-size: 0.875em;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cb-create {
  font-style: italic;
}

.cb-create .cb-option-label {
  color: var(--cb-focus-color);
}

.cb-status {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ------------------------------------------------------------------------- */
/* States reflected from the native source                                  */
/* ------------------------------------------------------------------------- */

.cb-text-control[aria-invalid="true"],
.cb-control:has([aria-invalid="true"]):has(.cb-input) {
  border-color: var(--cb-error-color);
}

/* Invalid focus owns a danger ring, not the accent one. */
.cb-text-control[aria-invalid="true"]:focus-visible,
.cb-control:has([aria-invalid="true"]):has(.cb-input:focus-visible) {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--cb-error-color) 20%, transparent);
}

.cb-control:has(.cb-input:disabled) {
  opacity: 0.65;
  cursor: not-allowed;
}

.cb-input:read-only,
.cb-input:disabled {
  cursor: default;
}

/* ------------------------------------------------------------------------- */
/* Fallback creation control — same system, no second engine                 */
/* ------------------------------------------------------------------------- */

.cb-fallback-create {
  display: flex;
  gap: 0.5rem;
  margin-block-start: 0.5rem;
}

.cb-fallback-input {
  flex: 1 1 auto;
}

.cb-fallback-add {
  flex: 0 0 auto;
  padding-inline: 0.875rem;
  cursor: pointer;
}

.cb-fallback-add:hover {
  border-color: var(--cb-focus-color);
}

/* The custom element is an enhancement/lifecycle boundary, not a shadow tree. */
combo-box {
  display: block;
  min-inline-size: 0;
}