#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-header-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
}

.main-container {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

#sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-sidebar-bg);
  overflow-y: auto;
  transition: transform var(--transition-normal);
  z-index: 900;
}

#sidebar.sidebar-collapsed {
  transform: translateX(-100%);
}

#content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--spacing-lg);
  min-height: calc(100vh - var(--header-height));
  transition: margin-left var(--transition-normal);
}

#content.content-full {
  margin-left: 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo img {
  height: 32px;
  width: auto;
}

.logo-text {
  font-size: 1.2rem;
  font-weight: bold;
  color: #fff;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xs);
}

.nav-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-md);
  font-weight: 500;
  transition: all var(--transition-fast);
}

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

.nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.sidebar-menu {
  padding: var(--spacing-md);
}

.sidebar-section {
  margin-bottom: var(--spacing-lg);
}

.sidebar-section-title {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--color-sidebar-text);
  text-decoration: none;
  font-size: var(--font-size-md);
  transition: all var(--transition-fast);
}

.sidebar-link:hover {
  background: var(--color-sidebar-hover);
  color: var(--color-text);
}

.sidebar-link.active {
  background: var(--color-sidebar-active);
  color: var(--color-primary);
}

.sidebar-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  background: var(--color-sidebar-bg);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
}

.sidebar-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-weight: 600;
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
  font-size: var(--font-size-md);
}

.sidebar-user-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-balance {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.mobile-menu-toggle {
  display: none;
  padding: var(--spacing-sm);
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--color-text);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 899;
}

/* Tablet: collapse sidebar, show mobile menu */
@media (max-width: 991px) {
  #sidebar {
    transform: translateX(-100%);
  }
  
  #sidebar.sidebar-open {
    transform: translateX(0);
  }
  
  #content {
    margin-left: 0;
  }
  
  .sidebar-overlay.show {
    display: block;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-menu.hide-mobile {
    display: none;
  }
}

/* Mobile: reduce header padding */
@media (max-width: 575px) {
  .header-left {
    gap: var(--spacing-sm);
  }
  
  .logo-text {
    font-size: 1rem;
  }
  
  #content {
    padding: var(--spacing-sm);
  }
}

.connection-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.connection-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.connection-dot.connected {
  background: var(--color-success);
}

.connection-dot.connecting {
  background: var(--color-warning);
  animation: pulse 1s infinite;
}

.connection-dot.disconnected {
  background: var(--color-danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}