/* === Global Navigation Rail === */
.global-nav {
  width: 64px;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-3) 0;
  background: var(--bg-panel-solid);
  border-right: 1px solid var(--border-soft);
  z-index: var(--z-nav);
}

.gn-top {
  padding-bottom: var(--space-3);
}

.gn-logo-btn {
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  color: var(--text-primary);
}
.gn-logo-btn:hover { background: var(--accent-soft); }
.gn-logo-btn svg { width: 28px; height: 28px; }

.gn-primary {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 0 0 auto;
}

.gn-item {
  position: relative;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-fast);
}
.gn-item:hover {
  background: var(--accent-soft);
  color: var(--text-secondary);
}
.gn-item.active {
  background: var(--accent-soft);
  color: var(--accent);
}
.gn-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
}
.gn-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.gn-spacer { flex: 1; }

.gn-secondary {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-soft);
}

/* Tooltip for nav items */
.gn-item[data-tip]:hover::after,
.gn-logo-btn[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  padding: 4px 10px;
  background: var(--bg-panel-solid);
  color: var(--text-primary);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xs);
  font-size: var(--text-xs);
  white-space: nowrap;
  z-index: var(--z-tooltip);
  box-shadow: var(--shadow-sm);
  pointer-events: none;
}

/* Mobile: bottom nav */
@media (max-width: 768px) {
  .global-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 56px;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    padding: 0 var(--space-2);
    border-right: none;
    border-top: 1px solid var(--border-soft);
  }
  .gn-top, .gn-spacer { display: none; }
  .gn-primary, .gn-secondary {
    flex-direction: row;
    gap: 0;
  }
  .gn-secondary { border-top: none; padding-top: 0; }
  .gn-item { width: 44px; height: 44px; }
  /* Hide tooltip on mobile */
  .gn-item[data-tip]:hover::after,
  .n-logo-btn[data-tip]:hover::after { display: none; }
  /* Show max 5 items on mobile, hide rest */
  .gn-primary .gn-item:nth-child(n+6) { display: none; }
}