:root {
  /* Colors - Enterprise Navy & Indigo Palette */
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --secondary: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #0ea5e9;
  
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-sidebar: #0f172a;
  
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-on-dark: #f8fafc;
  
  --border-color: #e2e8f0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: hidden;
}

/* Layout Structure */
.app-container {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--bg-sidebar);
  color: var(--text-on-dark);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  z-index: 100;
  transition: width 0.3s ease;
}

.sidebar-header {
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

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

.nav-group-label {
  padding: var(--space-md) var(--space-lg) var(--space-xs);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--secondary);
  letter-spacing: 0.05em;
  font-weight: 600;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 12px var(--space-lg);
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: all 0.2s;
  gap: 12px;
  font-size: 0.9375rem;
}

.nav-item:hover {
  background: rgba(255,255,255,0.05);
  color: #fff;
}

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

.nav-item svg {
  flex-shrink: 0;
  opacity: 0.8;
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  margin-left: 260px;
  display: flex;
  flex-direction: column;
  min-width: 0; /* Prevents flex items from overflowing */
}

/* Top Navbar */
.navbar {
  height: 64px;
  background: #fff;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  position: sticky;
  top: 0;
  z-index: 90;
}

.navbar-search {
  display: flex;
  align-items: center;
  background: var(--bg-main);
  border-radius: var(--radius-md);
  padding: 0 var(--space-md);
  width: 400px;
  border: 1px solid var(--border-color);
}

.navbar-search input {
  border: none;
  background: transparent;
  padding: 8px;
  width: 100%;
  outline: none;
  font-size: 0.875rem;
}

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

.icon-btn {
  background: transparent;
  border: none;
  color: var(--secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background 0.2s;
}

.icon-btn:hover {
  background: var(--bg-main);
}

.badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--danger);
  border-radius: 50%;
  border: 2px solid #fff;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding-left: var(--space-md);
  border-left: 1px solid var(--border-color);
  cursor: pointer;
}

.user-info {
  text-align: right;
}

.user-name {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
}

.user-role {
  display: block;
  font-size: 0.75rem;
  color: var(--secondary);
}

/* Content Layout */
.content {
  padding: var(--space-lg);
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

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

.page-title h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.page-title p {
  margin: 4px 0 0;
  color: var(--secondary);
  font-size: 0.875rem;
}

/* KPI Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow);
}

.kpi-card {
  display: flex;
  flex-direction: column;
}

.kpi-label {
  font-size: 0.875rem;
  color: var(--secondary);
  margin-bottom: var(--space-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.kpi-value {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.kpi-trend {
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.trend-up { color: var(--success); }
.trend-down { color: var(--danger); }

/* Grid Sections */
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Tables */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: var(--space-md);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--secondary);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-main);
}

td {
  padding: var(--space-md);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

.status-pill {
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-active { background: #dcfce7; color: #166534; }
.status-leave { background: #fef9c3; color: #854d0e; }
.status-pending { background: #fee2e2; color: #991b1b; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-outline {
  border-color: var(--border-color);
  background: #fff;
  color: var(--text-main);
}

.btn-outline:hover {
  background: var(--bg-main);
}

/* Avatars */
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--secondary);
}

.avatar-md {
  width: 40px;
  height: 40px;
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.timeline-item {
  display: flex;
  gap: var(--space-md);
  position: relative;
}

.timeline-point {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  margin-top: 4px;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.timeline-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: -24px;
  width: 2px;
  background: var(--border-color);
}

.timeline-content {
  flex: 1;
}

.timeline-time {
  font-size: 0.75rem;
  color: var(--secondary);
}

.timeline-desc {
  font-size: 0.875rem;
  margin-top: 2px;
}

/* Charts Placeholders */
.chart-placeholder {
  width: 100%;
  height: 240px;
  background: linear-gradient(180deg, var(--bg-main) 0%, #fff 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  padding: var(--space-md);
}

.bar {
  width: 30px;
  background: var(--primary);
  border-radius: 4px 4px 0 0;
  transition: height 0.5s ease;
}

.bar-2 { background: var(--info); }
.bar-3 { background: var(--secondary); }

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    width: 80px;
  }
  .sidebar .brand-name, 
  .sidebar .nav-group-label,
  .sidebar .nav-item span {
    display: none;
  }
  .main-wrapper {
    margin-left: 80px;
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .navbar-search {
    display: none;
  }
  
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .page-header .flex {
    width: 100%;
  }

  .page-header .btn {
    flex: 1;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --space-lg: 16px;
    --space-xl: 24px;
  }

  .sidebar {
    width: 0;
    overflow: hidden;
    padding: 0;
    border: none;
  }

  .main-wrapper {
    margin-left: 0;
  }

  .navbar {
    padding: 0 var(--space-md);
  }

  .content {
    padding: var(--space-md);
  }

  .page-title h1 {
    font-size: 1.25rem;
  }

  .filters-bar {
    flex-direction: column;
  }

  .filter-select, 
  .filters-bar .navbar-search {
    width: 100% !important;
    min-width: 0;
  }

  .kpi-grid {
    grid-template-columns: 1fr;
  }

  .user-info {
    display: none;
  }

  /* Table responsiveness on mobile */
  .table-container {
    margin: 0 -16px;
    width: calc(100% + 32px);
  }

  th, td {
    padding: var(--space-sm) var(--space-md);
  }

  /* Compact pagination */
  .flex.justify-between.items-center[style*="padding: 16px"] {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

/* Theme Switcher Visual States */
.theme-switch-dark .icon-sun { display: none; }
.theme-switch-dark .icon-moon { display: block; }
.theme-switch-light .icon-sun { display: block; }
.theme-switch-light .icon-moon { display: none; }

[data-theme="dark"] .badge { border-color: var(--bg-card); }

/* Filters */
.filters-bar {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filter-select {
  padding: 8px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  background: #fff;
  min-width: 150px;
}

/* Utility */
.text-right { text-align: right; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.mt-xl { margin-top: var(--space-xl); }
.text-sm { font-size: 0.875rem; }

.btn-sm {
  padding: 6px 12px;
}

.pagination-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  border-top: 1px solid var(--border-color);
}

@media (max-width: 600px) {
  .pagination-footer {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .pagination-btns {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }
}