.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-slow), transform var(--transition-slow);
  overflow: hidden;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  min-height: var(--topbar-height);
}

.sidebar-brand-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.sidebar-brand-text {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-inverse);
  white-space: nowrap;
  overflow: hidden;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.sidebar.collapsed .sidebar-brand-text {
  opacity: 0;
  pointer-events: none;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.sidebar-section-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  padding: 8px 12px 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.sidebar.collapsed .sidebar-section-label {
  opacity: 0;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--text-sidebar);
  font-size: var(--font-size-sm);
  font-weight: 400;
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  margin-bottom: 2px;
  position: relative;
}

.sidebar-nav-item:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-inverse);
}

.sidebar-nav-item.active {
  background: var(--bg-sidebar-active);
  color: var(--primary-light);
  font-weight: 500;
}

.sidebar-nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--primary);
  border-radius: 0 3px 3px 0;
}

.sidebar-nav-icon {
  font-size: 1.15rem;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-nav-label {
  overflow: hidden;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.sidebar.collapsed .sidebar-nav-label {
  opacity: 0;
  pointer-events: none;
}

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 10px;
  border-radius: var(--radius-md);
  color: var(--text-sidebar);
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-inverse);
}

.topbar {
  position: fixed;
  top: 0;
  right: 0;
  left: var(--sidebar-width);
  height: var(--topbar-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: var(--z-topbar);
  transition: left var(--transition-slow);
}

.sidebar-collapsed ~ .main-content .topbar {
  left: var(--sidebar-collapsed);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.topbar-date {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

.topbar-btn:hover {
  background: var(--bg);
  color: var(--text-primary);
}

.topbar-btn .notification-dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  background: var(--red);
  border-radius: 50%;
  border: 2px solid #fff;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1.3rem;
}