/* ============================================================
   PIER — styles/pier-editor-shell.css
   Project : Pier (rebuild of Piererra portfolio + tools)
   Phase   : 5 — Editor reskin (shared component)

   Shared by every multi-panel editor (GTA SA first; NFSU2/NFSMW
   follow the same pattern). Turns a long accordion scroll into a
   navigable dashboard:
     - Desktop (>=900px): sticky left sidebar listing every section
     - Mobile (<900px): sticky horizontal scrollable tab strip

   Consumes --tool-accent / --tool-accent-dim, which each tool's own
   CSS file defines as aliases (see the alias block at the top of
   editors/gtasa/gtasa-editor.css) — so the active/hover colors
   automatically match that tool's accent with zero extra config.

   Expected markup:
     <div id="..." class="pier-editor-layout" hidden>
       <nav class="pier-editor-nav" id="pier-editor-nav" aria-label="Editor sections">
         <a class="pier-editor-nav__link" href="#panel-id" data-section="panel-id">Label</a>
         ...
       </nav>
       <div class="pier-editor-panels">
         <details class="... pier-editor-panel" id="panel-id"> ... </details>
         ...
       </div>
     </div>
   Activated by scripts/pier-sidebar-nav.js — call once per page:
     PierSidebarNav.init('#pier-editor-nav', '.pier-editor-panel');
============================================================ */

.pier-editor-layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
}

.pier-editor-nav {
  position: sticky;
  top: 4.75rem; /* clears the sticky top .pier-nav bar */
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  max-height: calc(100vh - 5.5rem);
  overflow-y: auto;
  padding-right: 0.25rem;
}

.pier-editor-nav__link {
  display: block;
  text-decoration: none;
  color: var(--pier-text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.55rem 0.75rem;
  border-radius: var(--pier-radius-sm);
  border-left: 2px solid transparent;
  transition: color var(--pier-ease), background var(--pier-ease), border-color var(--pier-ease);
  white-space: nowrap;
}
.pier-editor-nav__link:hover {
  color: var(--pier-text);
  background: var(--pier-card);
}
.pier-editor-nav__link.is-active {
  color: var(--tool-accent, var(--pier-pink));
  background: var(--tool-accent-dim, var(--pier-pink-glow));
  border-left-color: var(--tool-accent, var(--pier-pink));
}

.pier-editor-panels {
  min-width: 0;
  max-width: 780px;
}

/* ============================================================
   MOBILE: sidebar collapses into a sticky horizontal tab strip
============================================================ */
@media (max-width: 900px) {
  .pier-editor-layout {
    display: block;
  }

  .pier-editor-nav {
    position: static;
    flex-direction: row;
    max-height: none;
    overflow-x: auto;
    overflow-y: visible;
    gap: 0.4rem;
    padding: 0.6rem 0.4rem;
    margin: 0 -0.9rem 1rem;
    background: var(--pier-panel);
    border-bottom: 1px solid var(--pier-border);
    scrollbar-width: thin;
  }

  .pier-editor-nav__link {
    flex-shrink: 0;
    border-left: none;
    border: 1px solid var(--pier-border);
    border-radius: 999px;
    padding: 0.5rem 0.9rem;
    min-height: 2.2rem; /* touch target */
    display: flex;
    align-items: center;
  }
  .pier-editor-nav__link.is-active {
    border-color: var(--tool-accent, var(--pier-pink));
  }

  .pier-editor-panels { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  .pier-editor-nav__link { transition: none; }
}