/* ──────────────────────────────────────────────────────────────────
   Top-Left Navigation Cluster — shared across all explainer pages
   Renders: [☰ Menu] [⌂ Workshop Home]
   The ☰ button opens the slide-out side panel; the home pill links
   directly to index.html. Both are fixed top-left so they stay in
   reach as the user scrolls.
   ────────────────────────────────────────────────────────────────── */
.nav-cluster {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 210;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-cluster-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: 10px;
  background: rgba(255,255,255,.92);
  border: 1.5px solid rgba(15,23,42,.10);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: #0F172A;
  cursor: pointer;
  text-decoration: none;
  transition: all .2s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
  white-space: nowrap;
}
.nav-cluster-btn:hover {
  background: rgba(5,150,105,.06);
  border-color: rgba(5,150,105,.40);
  color: #059669;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(5,150,105,.10);
}
.nav-cluster-btn:active { transform: translateY(0); }

/* Both pills are icon-only square buttons (consistent with the theme toggle) */
.nav-cluster-btn.is-toggle,
.nav-cluster-btn.is-home {
  width: 36px;
  padding: 0;
  justify-content: center;
  font-size: 17px;
}
.nav-cluster-btn.is-toggle.open {
  background: #059669;
  border-color: #059669;
  color: #fff;
}

@media (max-width: 640px) {
  .nav-cluster { top: 10px; left: 10px; gap: 4px; }
  .nav-cluster-btn { height: 32px; }
  .nav-cluster-btn.is-toggle,
  .nav-cluster-btn.is-home { width: 32px; font-size: 15px; }
}

/* Dark theme — flip the cluster surface */
html[data-theme="dark"] .nav-cluster-btn {
  background: rgba(17,26,46,.85);
  border-color: rgba(255,255,255,.10);
  color: #F1F5F9;
  box-shadow: 0 2px 8px rgba(0,0,0,.30);
}
html[data-theme="dark"] .nav-cluster-btn:hover {
  background: rgba(52,211,153,.14);
  border-color: rgba(52,211,153,.40);
  color: #6EE7B7;
  box-shadow: 0 4px 12px rgba(52,211,153,.20);
}
html[data-theme="dark"] .nav-cluster-btn.is-toggle.open {
  background: #10B981;
  border-color: #10B981;
  color: #0A0F1E;
}

/* ──────────────────────────────────────────────────────────────────
   Slide-out Side Navigation Panel
   Opens from the left when ☰ is clicked. Lists every explainer.
   ────────────────────────────────────────────────────────────────── */
.side-nav-panel {
  position: fixed;
  left: -260px;
  top: 0;
  bottom: 0;
  width: 260px;
  background: #FFFFFF;
  border-right: 1.5px solid #E2E8F0;
  z-index: 199;
  transition: left .35s cubic-bezier(.4,0,.2,1);
  overflow-y: auto;
  padding: 64px 0 24px;  /* leave room for the cluster at top */
  box-shadow: 4px 0 20px rgba(0,0,0,.06);
}
.side-nav-panel.open { left: 0; }

.snp-header {
  padding: 8px 18px 14px;
  border-bottom: 1px solid #E2E8F0;
}
.snp-header .snp-title {
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: #0F172A;
}
.snp-header .snp-sub {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: #94A3B8;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-top: 4px;
}

.snp-section-label {
  font-family: 'Outfit', sans-serif;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #94A3B8;
  padding: 14px 18px 6px;
}

.snp-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.snp-list li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  font-size: 12.5px;
  font-weight: 500;
  color: #334155;
  text-decoration: none;
  transition: all .2s ease;
  border-left: 3px solid transparent;
}
.snp-list li a:hover {
  color: #059669;
  background: rgba(5,150,105,.04);
  border-left-color: rgba(5,150,105,.3);
}
.snp-list li a.current {
  color: #059669;
  background: rgba(5,150,105,.06);
  border-left-color: #059669;
  font-weight: 600;
}
.snp-list li a .nav-icon {
  font-size: 15px;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
}

.snp-divider {
  height: 1px;
  background: #E2E8F0;
  margin: 8px 18px;
}

/* Soft scrim behind the open panel — closes on click */
.side-nav-scrim {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,.20);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
  z-index: 198;
}
.side-nav-scrim.open { opacity: 1; pointer-events: auto; }