/* version-tabs.css — <version-tabs> component styles (M4 closure)
   Replaces .variant-tags-row span pills with keyboard-navigable tab buttons.
   Depends on: tokens.css (loaded before this file in default.html / container-detail.html). */

/* -----------------------------------------------------------------------
   Host element — stretch to block, no extra margin
   ----------------------------------------------------------------------- */
version-tabs {
  display: block;
}

/* -----------------------------------------------------------------------
   Version group — one tablist per version
   ----------------------------------------------------------------------- */
.version-tabs-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: baseline;
  margin-block: var(--space-md);
}

/* Eyebrow version label above the tab row */
.version-tabs-group-label {
  /* .eyebrow is defined in tokens.css — JetBrains Mono regular uppercase 0.08em */
  width: 100%;
  margin-block-end: var(--space-xs);
}

/* -----------------------------------------------------------------------
   Tab button — base state
   ----------------------------------------------------------------------- */
.version-tab {
  /* Reset <button> defaults */
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;

  /* Layout */
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-inset-squish-md);  /* 8px 16px */
  border-radius: var(--radius-md);

  /* Typography */
  font-family: var(--font-family-sans);
  font-size: var(--font-size-body-sm);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  text-decoration: none;

  /* Color */
  color: var(--color-text-secondary);

  /* Motion */
  transition:
    color          var(--motion-duration-short) var(--easing-standard),
    background     var(--motion-duration-short) var(--easing-standard),
    border-color   var(--motion-duration-short) var(--easing-standard);
}

@media (prefers-reduced-motion: reduce) {
  .version-tab {
    transition: none;
  }
}

/* -----------------------------------------------------------------------
   Tab button — hover state
   ----------------------------------------------------------------------- */
.version-tab:hover {
  background: var(--color-surface-raised);
  color: var(--color-text-primary);
}

/* -----------------------------------------------------------------------
   Tab button — selected / active state
   ----------------------------------------------------------------------- */
.version-tab--selected,
.version-tab[aria-selected="true"] {
  background: var(--color-surface-raised);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  border-bottom: 2px solid var(--color-action-primary);
  /* Compensate 1px transparent → 2px active so layout doesn't shift */
  padding-block-end: calc(var(--space-sm) - 1px);
}

/* -----------------------------------------------------------------------
   Tab button — focus-visible ring (WCAG 2.2 §2.4.11 min 2px)
   ----------------------------------------------------------------------- */
.version-tab:focus-visible {
  outline: 2px solid var(--color-action-primary);
  outline-offset: 2px;
}

/* -----------------------------------------------------------------------
   Default-variant badge inside a tab
   ----------------------------------------------------------------------- */
.version-tab-default-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: var(--color-action-primary);
  border: 1px solid var(--color-action-primary);
  border-radius: var(--radius-sm);
  padding: 1px 4px;
  line-height: 1.4;
}

/* -----------------------------------------------------------------------
   Mobile — single-row horizontal scroll with snap
   ----------------------------------------------------------------------- */
@media (max-width: 640px) {
  .version-tabs-group {
    flex-wrap: nowrap;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    /* Hide scrollbar cosmetically — still scrollable */
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .version-tabs-group::-webkit-scrollbar {
    display: none;
  }

  /* Fix #7: label must NOT take width:100% inside a nowrap scroller — it would
     consume the entire viewport width and push the first tab off-screen.
     Use flex: 0 0 auto so the label sits inline before the tabs and scrolls
     with them (option b — simplest, no markup change required). */
  .version-tabs-group-label {
    flex: 0 0 auto;
    width: auto;
  }

  .version-tab {
    scroll-snap-align: start;
    flex-shrink: 0;
  }
}