/* Specialized styling for C++ Master Tutorial Lessons & Accordion Sidebar */
.content {
  max-width: 1080px !important;
  width: 100%;
}

.sidebar-home-link {
  display: flex !important;
  align-items: center;
  gap: 10px;
  padding: 10px 14px !important;
  margin: 0 4px 8px 4px !important;
  background: rgba(59, 130, 246, 0.08) !important;
  border: 1px solid rgba(59, 130, 246, 0.25) !important;
  border-radius: 9px !important;
  color: #3b82f6 !important;
  font-size: 13px !important;
  font-weight: 700 !important;
  text-decoration: none !important;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.sidebar-home-link:hover {
  background: rgba(59, 130, 246, 0.16) !important;
  border-color: #3b82f6 !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.sidebar-home-link.active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.18), rgba(20, 24, 32, 0.8)) !important;
  border-color: #3b82f6 !important;
  color: #3b82f6 !important;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.25);
}

.sidebar-accordion {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 0 4px;
  margin-top: 6px;
}

.accordion-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: #141922;
  border: 1px solid #27303f;
  border-radius: 10px;
  color: var(--text, #f0f6fc);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: inherit;
  user-select: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.accordion-header:hover {
  background: #1a2230;
  border-color: #38455a;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.accordion-header.active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, rgba(20, 25, 34, 0.9) 100%);
  border-color: #3b82f6;
  box-shadow: 0 0 14px rgba(59, 130, 246, 0.18);
}

.accordion-header-main {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.phase-icon-box {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.accordion-header.active .phase-icon-box {
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.4);
  transform: scale(1.05);
}

.phase-info {
  display: flex;
  flex-direction: column;
  gap: 1.5px;
  min-width: 0;
}

.phase-tag {
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text3, #8b949e);
  line-height: 1;
}

.accordion-header.active .phase-tag {
  color: #3b82f6;
}

.phase-title {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text, #ffffff);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

.accordion-header-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.phase-count-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text2, #8b949e);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.2px;
}

.accordion-header.active .phase-count-badge {
  background: rgba(59, 130, 246, 0.2);
  color: #3b82f6;
  border-color: rgba(59, 130, 246, 0.35);
  font-weight: 700;
}

.accordion-chevron {
  color: var(--text3, #8b949e);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), color 0.2s;
  flex-shrink: 0;
}

.accordion-header.active .accordion-chevron {
  transform: rotate(90deg);
  color: #3b82f6;
}

.accordion-content {
  display: none;
  flex-direction: column;
  padding: 4px 0 6px 10px;
  border-left: 2px solid rgba(59, 130, 246, 0.35);
  margin-left: 17px;
  margin-top: 3px;
  margin-bottom: 5px;
  gap: 2px;
}

.accordion-content.open {
  display: flex;
  animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.accordion-content a {
  display: block;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text2, #8b949e);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.15s ease;
  line-height: 1.35;
}

.accordion-content a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
  transform: translateX(2px);
}

.accordion-content a.active {
  color: #ffffff !important;
  background: #3b82f6 !important;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.35);
}

/* =========================================================================
   LIGHT THEME OVERRIDES FOR C++ ACCORDION & SIDEBAR
   ========================================================================= */
body.light-theme .sidebar-home-link {
  background: #eff6ff !important;
  border-color: #bfdbfe !important;
  color: #2563eb !important;
}

body.light-theme .sidebar-home-link.active {
  background: #dbeafe !important;
  border-color: #3b82f6 !important;
  color: #1d4ed8 !important;
}

body.light-theme .accordion-header {
  background: #ffffff;
  border-color: #e2e8f0;
  color: #0f172a;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

body.light-theme .accordion-header:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

body.light-theme .accordion-header.active {
  background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
  border-color: #3b82f6;
  box-shadow: 0 2px 10px rgba(59, 130, 246, 0.15);
}

body.light-theme .phase-icon-box {
  background: #f1f5f9;
  border-color: #e2e8f0;
}

body.light-theme .accordion-header.active .phase-icon-box {
  background: #dbeafe;
  border-color: #bfdbfe;
}

body.light-theme .phase-tag {
  color: #64748b;
}

body.light-theme .accordion-header.active .phase-tag {
  color: #2563eb;
}

body.light-theme .phase-title {
  color: #0f172a;
}

body.light-theme .phase-count-badge {
  background: #f1f5f9;
  color: #475569;
  border-color: #e2e8f0;
}

body.light-theme .accordion-header.active .phase-count-badge {
  background: #dbeafe;
  color: #2563eb;
  border-color: #93c5fd;
}

body.light-theme .accordion-chevron {
  color: #94a3b8;
}

body.light-theme .accordion-header.active .accordion-chevron {
  color: #2563eb;
}

body.light-theme .accordion-content a {
  color: #475569;
}

body.light-theme .accordion-content a:hover {
  color: #0f172a;
  background: #f1f5f9;
}

body.light-theme .accordion-content a.active {
  background: #3b82f6 !important;
  color: #ffffff !important;
}