/**
 * Layout Styles
 * ModaDesk Invoicing Tool
 */

/* ============================================
   MAIN LAYOUT
   ============================================ */

.app {
  display: flex;
  min-height: 100vh;
  background-color: var(--color-bg-secondary);
}

/* ============================================
   SIDEBAR
   ============================================ */

.sidebar {
  width: var(--sidebar-width);
  background-color: var(--color-bg-sidebar);
  border-right: var(--border-width) solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: var(--z-index-sticky);
}

.sidebar-header {
  padding: var(--spacing-2xl);
  border-bottom: var(--border-width) solid var(--color-border);
}

.sidebar-logo {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.sidebar-nav {
  flex: 1;
  padding: var(--spacing-xl) 0;
  overflow-y: auto;
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-2xl);
  margin: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

.sidebar-nav-item:hover {
  background-color: var(--color-bg-hover);
  color: #1D3C73;
}

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

.sidebar-nav-item svg,
.sidebar-nav-item img,
.sidebar-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  object-fit: contain;
}

.sidebar-nav-item svg {
  stroke: var(--color-text-secondary);
  transition: stroke var(--transition-base);
}

.sidebar-nav-item:hover svg,
.sidebar-nav-item.active svg {
  stroke: var(--color-primary);
}

.sidebar-footer {
  padding: var(--spacing-xl);
  border-top: var(--border-width) solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.sidebar-footer-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

.sidebar-footer-item:hover {
  background-color: var(--color-bg-hover);
}

.sidebar-footer-item.logout {
  color: var(--color-danger);
}

.sidebar-footer-item.logout:hover {
  background-color: var(--color-danger-bg);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================
   HEADER
   ============================================ */

.header {
  height: var(--header-height);
  background-color: var(--color-bg-primary);
  border-bottom: var(--border-width) solid var(--color-border);
  padding: 0 var(--spacing-4xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: var(--z-index-sticky);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 0;
  flex: 1;
}

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

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  flex-shrink: 0;
}

.header-notification {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  border: 1px solid #D1D5DB;
}

.header-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

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

.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background-color: #EF4444;
  color: white;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 5px;
  border-radius: 10px;
  min-width: 18px;
  height: 18px;
  text-align: center;
  line-height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Notification Dropdown */
.notification-dropdown {
  position: absolute;
  top: calc(100% + 15px);
  right: 0;
  width: 400px;
  max-height: 500px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  display: none;
  flex-direction: column;
  z-index: 9999;
  overflow: hidden;
  border: 1px solid #e5e7eb;
}

.notification-dropdown::before {
  content: '';
  position: absolute;
  top: -8px;
  right: 15px;
  width: 16px;
  height: 16px;
  background: white;
  border-left: 1px solid #e5e7eb;
  border-top: 1px solid #e5e7eb;
  transform: rotate(45deg);
}

.notification-dropdown.active {
  display: flex;
}

.notification-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #e5e7eb;
}

.notification-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.mark-all-read-btn {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.mark-all-read-btn:hover {
  background-color: rgba(99, 102, 241, 0.1);
}

.notification-list {
  flex: 1;
  overflow-y: auto;
  max-height: 450px;
}

.notification-item {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #e5e7eb;
  cursor: pointer;
  transition: background-color 0.2s;
  display: flex;
  gap: 0.75rem;
}

.notification-item:hover {
  background-color: #f9fafb;
}

.notification-item.unread {
  background-color: rgba(99, 102, 241, 0.05);
}

.notification-item.unread::before {
  content: '';
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
  margin-top: 0.5rem;
  flex-shrink: 0;
}

.notification-item.read::before {
  content: '';
  width: 8px;
  height: 8px;
  flex-shrink: 0;
}

.notification-content {
  flex: 1;
}

.notification-title {
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

.notification-message {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.notification-time {
  color: var(--color-text-tertiary);
  font-size: 0.75rem;
}

.notification-loading,
.notification-empty {
  padding: 2rem 1.25rem;
  text-align: center;
  color: var(--color-text-secondary);
}

.notification-empty-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  opacity: 0.3;
}

.header-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md) var(--spacing-xs) var(--spacing-xs);
  border-radius: var(--border-radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid #D1D5DB;
}

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

.header-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-full);
  overflow: hidden;
  background-color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.header-user-icon {
  color: var(--color-text-light);
}

/* ============================================
   PAGE CONTENT
   ============================================ */

.page-content {
  flex: 1;
  padding: var(--spacing-4xl);
}

.page-header {
  margin-bottom: var(--spacing-4xl);
}

.page-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--spacing-sm);
}

.page-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.page-header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-4xl);
}

/* ============================================
   GRID LAYOUTS
   ============================================ */

.grid {
  display: grid;
  gap: var(--spacing-2xl);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   MOBILE MENU BUTTON (hidden on desktop)
   ============================================ */

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-primary);
  padding: 4px;
  border-radius: var(--border-radius-md);
  line-height: 0;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
}

.mobile-menu-btn:hover {
  background-color: var(--color-bg-hover);
}

/* Sidebar overlay (mobile only) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 199;
}

.sidebar-overlay.active {
  display: block;
}

/* ============================================
   RESPONSIVE — TABLET  (≤1200px)
   ============================================ */

@media (max-width: 1200px) {
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   RESPONSIVE — MOBILE  (≤768px)
   ============================================ */

@media (max-width: 768px) {

  /* Show hamburger button */
  .mobile-menu-btn {
    display: flex;
  }

  /* Sidebar: hidden off-screen, slides in when .open */
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 200;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.18);
  }

  /* Main content takes full width */
  .main-content {
    margin-left: 0;
  }

  /* Header */
  .header {
    padding: 0 var(--spacing-lg);
    height: auto;
    min-height: 64px;
  }
  .header-title {
    font-size: var(--font-size-base);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 160px;
  }
  .header-actions {
    gap: var(--spacing-sm);
  }
  /* Hide text label next to avatar on mobile */
  .header-user-name,
  .header-user-icon {
    display: none;
  }
  .header-user {
    padding: 3px;
    border-radius: var(--border-radius-full);
  }

  /* Page content */
  .page-content {
    padding: var(--spacing-lg);
  }
  .page-title {
    font-size: var(--font-size-2xl);
  }
  .page-header {
    margin-bottom: var(--spacing-2xl);
  }

  /* Page header actions: stack vertically */
  .page-header-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
  }
  .page-header-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* Grids collapse to single column */
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }

  /* Notification dropdown */
  .notification-dropdown {
    width: calc(100vw - 32px);
    right: -48px;
    max-width: 360px;
  }
}

/* ============================================
   RESPONSIVE — SMALL MOBILE  (≤480px)
   ============================================ */

@media (max-width: 480px) {
  .header-title {
    max-width: 120px;
    font-size: var(--font-size-sm);
  }
  .page-content {
    padding: var(--spacing-md);
  }
}