/* =============================================================================
   GLASS — navigation.css
   Tabs, breadcrumbs, a menu/dropdown. Every declaration reads from
   src/tokens.css; this file introduces no colour, no radius, no duration and
   no font of its own — the same rule primitives.css obeys.

   Requires src/tokens.css and src/primitives.css (menu items reuse .btn-ghost
   sizing conventions). Verified by: node scripts/contrast.mjs
   ============================================================================= */

/* =============================================================================
   1. TABS — an underline rail, one active tab. role="tablist" on .tabs,
   role="tab" + aria-selected on .tab; the underline is the graphic channel
   (--accent, 3:1 already cleared) and aria-selected carries the state for
   assistive tech, so nothing here depends on colour alone.
   ============================================================================= */

.tabs {
  display: flex;
  align-items: stretch;
  gap: var(--sp-5);
  border-bottom: 1px solid var(--line);
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: var(--target-min);
  padding: var(--sp-2) var(--sp-1);
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-size: var(--fs-1);
  font-weight: 550;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.tab:hover { color: var(--ink); }

.tab:focus-visible {
  outline: var(--focus-w) solid var(--focus);
  outline-offset: var(--focus-off);
}

.tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.tab:disabled {
  color: var(--ink-3);
  cursor: not-allowed;
}

/* =============================================================================
   2. BREADCRUMBS — a trail. The separator is a glyph, not a border, so it
   reads correctly in a screen reader's linear pass over the list.
   ============================================================================= */

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-0);
  color: var(--ink-2);
}

.breadcrumbs li { display: flex; align-items: center; gap: var(--sp-1); }

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  color: var(--ink-3);
}

.breadcrumbs a {
  color: var(--ink-2);
  text-decoration: none;
  border-radius: var(--r-1);
}

.breadcrumbs a:hover { color: var(--ink); text-decoration: underline; }

.breadcrumbs a:focus-visible {
  outline: var(--focus-w) solid var(--focus);
  outline-offset: var(--focus-off);
}

.breadcrumbs [aria-current="page"] {
  color: var(--ink);
  font-weight: 550;
}

/* =============================================================================
   3. MENU / DROPDOWN — a glass panel of actions, anchored under a trigger.
   .menu is positioning-agnostic (position it with a popover, an anchor, or a
   library); what it owns is the panel's material and the item states. Sits
   above page content at --z-dropdown (tokens.css §1.12).
   ============================================================================= */

.menu {
  position: absolute;
  z-index: var(--z-dropdown);
  min-width: 12rem;
  padding: var(--sp-2);
  margin: 0;
  list-style: none;
  background: var(--gl-fill);
  -webkit-backdrop-filter: var(--gl-blur);
  backdrop-filter: var(--gl-blur);
  border: 1px solid var(--gl-edge);
  border-radius: var(--r-2);
  box-shadow: var(--gl-shadow);
}

.menu-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  width: 100%;
  min-height: var(--target-min);
  padding: var(--sp-2) var(--sp-3);
  border: none;
  border-radius: var(--r-1);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: var(--fs-1);
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease);
}

.menu-item:hover,
.menu-item[data-active="true"] {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
}

.menu-item:focus-visible {
  outline: var(--focus-w) solid var(--focus);
  outline-offset: calc(var(--focus-off) * -1);
}

.menu-item[aria-disabled="true"] {
  color: var(--ink-3);
  cursor: not-allowed;
}

.menu-item-danger { color: var(--bad); }
.menu-item-danger:hover { background: color-mix(in srgb, var(--bad) 14%, transparent); }

.menu-sep {
  height: 1px;
  margin: var(--sp-2) var(--sp-1);
  background: var(--line);
  border: none;
}