.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), background-color var(--transition-normal);
  z-index: 100;
  position: fixed;
  height: 100%;
}

.sidebar-header {
  padding: 24px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
}

.sidebar-nav {
  flex: 1;
  padding: 20px 0;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 14px 24px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
  gap: 12px;
}

.nav-item:hover {
  background-color: rgba(59, 130, 246, 0.05);
  color: var(--color-primary);
}

.nav-item.active {
  color: var(--color-primary);
  background-color: rgba(59, 130, 246, 0.1);
  border-left-color: var(--color-primary);
}

.nav-item i {
  font-size: 1.2rem;
  width: 24px;
  text-align: center;
}

/* Main Content Area */
.main-content {
  flex: 1;
  margin-left: 260px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Topbar */
.topbar {
  height: 70px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: sticky;
  top: 0;
  z-index: 90;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text);
  text-decoration: none;
}

.content-area {
  padding: 32px;
  flex: 1;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
  }
  .mobile-toggle {
    display: block;
  }
}