/* Tabs: [role=tablist] with [role=tab] and [role=tabpanel], or [data-tabs] with radios and labels */

:root,
:host,
[data-theme] {
  --pico-tabs-tab-color: var(--pico-muted-color);
  --pico-tabs-tab-hover-color: var(--pico-color);
  --pico-tabs-active-color: var(--pico-primary);
  --pico-tabs-indicator-color: var(--pico-primary-background);
  --pico-tabs-border-color: var(--pico-muted-border-color);
  --pico-tabs-indicator-width: var(--pico-outline-width);
}

/* ARIA tabs (a script moves the selection, see the fixture) */
[role="tablist"] {
  display: flex;
  margin-bottom: 0;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-inline: contain;
  scroll-padding-inline: var(--pico-nav-link-spacing-horizontal);
  scrollbar-width: thin;
  border-block-end: var(--pico-border-width) solid var(--pico-tabs-border-color);
  list-style: none;
}

[role="tab"],
[data-tabs] > input[type="radio"] + label {
  display: block;
  flex: none;
  inline-size: auto;
  margin: 0;
  padding: var(--pico-nav-link-spacing-vertical) calc(var(--pico-nav-link-spacing-horizontal) * 2);
  border: 0;
  border-block-end: var(--pico-tabs-indicator-width) solid transparent;
  border-start-start-radius: var(--pico-border-radius);
  border-start-end-radius: var(--pico-border-radius);
  border-end-start-radius: 0;
  border-end-end-radius: 0;
  background: none;
  box-shadow: none;
  color: var(--pico-tabs-tab-color);
  font-size: 1rem;
  font-weight: 500;
  line-height: var(--pico-line-height);
  text-align: start;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;

  &:focus-visible {
    outline: var(--pico-outline-width) solid var(--pico-primary-focus);
    outline-offset: calc(var(--pico-outline-width) * -1);
  }
}

[role="tab"][aria-selected="true"],
[data-tabs] > input[type="radio"]:checked + label {
  border-color: var(--pico-tabs-indicator-color);
  color: var(--pico-tabs-active-color);
}

[role="tab"][aria-disabled="true"],
[data-tabs] > input[type="radio"]:disabled + label {
  border-color: transparent;
  color: var(--pico-tabs-tab-color);
  opacity: var(--pico-form-element-disabled-opacity);
  cursor: not-allowed;
}

@media (hover: hover) {
  [role="tab"]:not([aria-selected="true"], [aria-disabled="true"]):hover,
  [data-tabs] > input[type="radio"]:not(:checked, :disabled) + label:hover {
    color: var(--pico-tabs-tab-hover-color);
  }
}

[role="tabpanel"],
[data-tabs] > section {
  margin: 0;
  padding-block-start: var(--pico-spacing);

  &[hidden] {
    display: none;
  }

  &:focus-visible {
    outline: var(--pico-outline-width) solid var(--pico-primary-focus);
    outline-offset: calc(var(--pico-outline-width) * -1);
  }
}

/* Vertical: a column beside its panel from 576px. On phones the panel would be too narrow, so
   the list stays a horizontal scrolling row. :has() is at the floor, without it the panel stacks. */
@media (width >= 576px) {
  [role="tablist"][aria-orientation="vertical"] {
    flex-direction: column;
    gap: 0.125rem;
    overflow: visible;
    border-block-end: 0;

    & > [role="tab"] {
      border-block-end: 0;
      border-inline-start: var(--pico-tabs-indicator-width) solid transparent;
      border-radius: var(--pico-border-radius);
      border-start-start-radius: 0;
      border-end-start-radius: 0;
    }

    /* The darker text step keeps 4.5:1 on the tint in every theme */
    & > [role="tab"][aria-selected="true"] {
      border-color: var(--pico-tabs-indicator-color);
      background-color: var(--pico-primary-subtle-background);
      color: var(--pico-primary-hover);
    }
  }

  :has(> [role="tablist"][aria-orientation="vertical"]) {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: var(--pico-spacing);

    & > [role="tablist"] {
      grid-column: 1;
      grid-row: 1;
      align-self: start;
    }

    & > [role="tabpanel"] {
      grid-column: 2;
      grid-row: 1;
      padding-block-start: 0;
    }
  }
}

/* Radio tabs (no script). The radios are hidden, the label after each one is the tab */
[data-tabs] {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  margin-bottom: var(--pico-spacing);

  & > input[type="radio"] {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    clip-path: inset(50%);
    opacity: 0;
    pointer-events: none;
  }

  & > input[type="radio"] + label {
    position: relative;
    margin-block-end: calc(var(--pico-border-width) * -1);
  }

  & > input[type="radio"]:focus-visible + label {
    outline: var(--pico-outline-width) solid var(--pico-primary-focus);
    outline-offset: calc(var(--pico-outline-width) * -1);
  }

  & > section {
    display: none;
    flex: 0 0 100%;
    border-block-start: var(--pico-border-width) solid var(--pico-tabs-border-color);
  }

  /* Panel n shows when radio n is checked, up to ten tabs per group */
  & > input:nth-of-type(1):checked ~ section:nth-of-type(1),
  & > input:nth-of-type(2):checked ~ section:nth-of-type(2),
  & > input:nth-of-type(3):checked ~ section:nth-of-type(3),
  & > input:nth-of-type(4):checked ~ section:nth-of-type(4),
  & > input:nth-of-type(5):checked ~ section:nth-of-type(5),
  & > input:nth-of-type(6):checked ~ section:nth-of-type(6),
  & > input:nth-of-type(7):checked ~ section:nth-of-type(7),
  & > input:nth-of-type(8):checked ~ section:nth-of-type(8),
  & > input:nth-of-type(9):checked ~ section:nth-of-type(9),
  & > input:nth-of-type(10):checked ~ section:nth-of-type(10) {
    display: block;
  }
}

@media (prefers-reduced-motion: no-preference) {
  [role="tab"],
  [data-tabs] > input[type="radio"] + label {
    transition:
      color var(--pico-transition),
      border-color var(--pico-transition);
  }

  [role="tabpanel"]:not([hidden]),
  [data-tabs] > section {
    transition:
      opacity var(--pico-transition),
      translate var(--pico-transition);

    @starting-style {
      opacity: 0;
      translate: 0 0.25rem;
    }
  }
}

@media (forced-colors: active) {
  [role="tab"][aria-selected="true"],
  [data-tabs] > input[type="radio"]:checked + label {
    border-color: Highlight;
  }
}