/* Sidebar — hub page layout */

.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 100;
  padding: 24px 0 32px;
  transition: transform 0.3s ease;
}

.sidebar-brand {
  padding: 0 16px 20px;
  font-family: var(--font-nav);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.sidebar-brand span { color: var(--text-bright); display: block; margin-bottom: 2px; }

.nav-group-label {
  padding: 12px 16px 4px;
  font-family: var(--font-nav);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.nav-divider {
  padding: 2px 16px;
  font-family: var(--font-nav);
  font-size: 9px;
  color: var(--border-lit);
  user-select: none;
}

.sidebar a {
  display: block;
  padding: 4px 16px 4px 24px;
  font-family: var(--font-nav);
  font-size: 12px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s, background 0.2s;
  border-left: 2px solid transparent;
}

.sidebar a:hover { color: var(--text-bright); background: rgba(0,0,0,0.03); }
.sidebar a.active { color: var(--text-white); border-left-color: var(--text-dim); background: rgba(0,0,0,0.05); }

.sidebar a.indent-2 { padding-left: 36px; }
.sidebar a.indent-3 { padding-left: 48px; font-size: 11px; }

.sidebar a.vertex-diff:hover, .sidebar a.vertex-diff.active { color: var(--diff); border-left-color: var(--diff); }
.sidebar a.vertex-conn:hover, .sidebar a.vertex-conn.active { color: var(--conn); border-left-color: var(--conn); }
.sidebar a.vertex-bound:hover, .sidebar a.vertex-bound.active { color: var(--bound); border-left-color: var(--bound); }
.sidebar a.vertex-arch:hover, .sidebar a.vertex-arch.active { color: var(--arch); border-left-color: var(--arch); }

.sidebar .page-link {
  color: var(--text-dim);
  font-size: 11px;
  padding-left: 24px;
  opacity: 0.7;
}
.sidebar .page-link:hover { opacity: 1; color: var(--text); }

/* Hamburger */
.hamburger {
  display: none;
  position: fixed;
  top: 16px; left: 16px;
  z-index: 200;
  width: 36px; height: 36px;
  background: var(--surface-raised);
  border: 1px solid var(--border-lit);
  border-radius: 6px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.hamburger span {
  display: block;
  width: 18px; height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 90;
}

/* Main content area (sidebar layout) */
.main {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
}

.content {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--content-pad);
}