/* ==========================================================================
   Persistent Blog sidebar nav (added 2026-09-16).
   Collapsed by default: a small fixed tab on the left edge. Clicking it
   slides in an overlay panel with a link to /blog/ + the 4 category pages.
   Pure CSS/JS, no framework, no page-layout changes -- fixed/overlay only,
   so it never reflows or resizes any existing page content.
   ========================================================================== */

.blog-sidebar-tab {
  position: fixed;
  left: 0;
  top: 45%;
  transform: translateY(-50%);
  z-index: 60;
  background: var(--maroon, #8B0000);
  color: #fff;
  border: none;
  border-radius: 0 8px 8px 0;
  padding: 16px 8px;
  font-family: 'Poppins', 'Inter', sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  cursor: pointer;
  box-shadow: 2px 0 10px rgba(0,0,0,0.15);
  transition: background 0.2s;
}
.blog-sidebar-tab:hover { background: var(--maroon-bright, #A50000); }

.blog-sidebar-panel {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 270px;
  max-width: 82vw;
  background: #fff;
  z-index: 65;
  box-shadow: 4px 0 28px rgba(0,0,0,0.2);
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1.25rem;
  overflow-y: auto;
}
.blog-sidebar-panel.open { transform: translateX(0); }

.blog-sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border, #e5e7eb);
}
.blog-sidebar-header span {
  font-family: 'Poppins', 'Inter', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--navy, #1B3A57);
}
.blog-sidebar-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--muted, #5a6472);
  cursor: pointer;
  padding: 0 0.25rem;
}
.blog-sidebar-close:hover { color: var(--maroon, #8B0000); }

.blog-sidebar-links { display: flex; flex-direction: column; gap: 0.35rem; }
.blog-sidebar-link {
  display: block;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  color: var(--text, #1a1a1a);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: background 0.15s, color 0.15s;
}
.blog-sidebar-link:hover { background: var(--bg-alt, #f5f5f5); color: var(--maroon, #8B0000); }
.blog-sidebar-link-main {
  color: var(--maroon, #8B0000);
  border-bottom: 1px solid var(--border, #e5e7eb);
  margin-bottom: 0.5rem;
  padding-bottom: 0.9rem;
  border-radius: 0;
}
.blog-sidebar-cat-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted, #5a6472);
  margin: 0.35rem 0 0.15rem 0.75rem;
}

.blog-sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15,23,32,0.4);
  z-index: 62;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.blog-sidebar-backdrop.open { opacity: 1; pointer-events: auto; }

/* Mobile fallback: smaller tab, tucked lower so it never covers the
   navbar's own hamburger/links; panel becomes a near-full-width drawer. */
@media (max-width: 640px) {
  .blog-sidebar-tab {
    top: auto;
    bottom: 18px;
    padding: 10px 6px;
    font-size: 0.7rem;
    border-radius: 0 8px 8px 0;
  }
  .blog-sidebar-panel { width: 85vw; }
}