* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  min-height: 100%;
}

body {
  overflow-x: hidden;
}

.app-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: auto 1fr;
  height: 100vh;
  gap: 0;
}

.app-sidebar {
  grid-column: 1;
  grid-row: 1 / -1;
  background: var(--color-bg-primary);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  z-index: 999;
}

.app-header {
  grid-column: 2;
  grid-row: 1;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-8);
  height: 72px;
}

.app-main {
  grid-column: 2;
  grid-row: 2;
  overflow-y: auto;
  padding: var(--space-8);
  background: var(--color-bg-secondary);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

.sidebar-logo svg {
  width: 28px;
  height: 28px;
}

.sidebar-menu {
  list-style: none;
  padding: var(--space-2);
}

.sidebar-menu-item {
  margin-bottom: var(--space-1);
}

.sidebar-menu-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.sidebar-menu-link:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-primary);
  transform: translateX(4px);
}

.sidebar-menu-link.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.sidebar-menu-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex: 1;
}

.header-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.header-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.header-breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-breadcrumb-separator {
  color: var(--color-border);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  min-width: 300px;
}

.header-search input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.header-search input::placeholder {
  color: var(--color-text-tertiary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}

.header-action-btn:hover {
  background: var(--color-bg-secondary);
  color: var(--color-primary);
}

.header-action-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--color-danger);
  color: white;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
}

.header-profile {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.header-profile:hover {
  background: var(--color-bg-tertiary);
}

.header-profile-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-primary-gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
}

.header-profile-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.header-profile-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.header-profile-role {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

@media (max-width: 1024px) {
  .app-sidebar {
    position: fixed;
    left: -280px;
    height: 100vh;
    transition: left var(--transition-base);
    box-shadow: var(--shadow-lg);
  }

  .app-sidebar.open {
    left: 0;
  }

  .app-container {
    grid-template-columns: 1fr;
  }

  .app-header {
    grid-column: 1;
  }

  .app-main {
    grid-column: 1;
  }
}

@media (max-width: 640px) {
  .app-header {
    padding: var(--space-4);
    height: 60px;
  }

  .header-search {
    display: none;
  }

  .app-main {
    padding: var(--space-4);
  }
}