:root {
  --primary-color: #0ea5e9;
  --primary-dark: #0284c7;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --background-color: #ffffff;
  --surface-color: #f8fafc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

.sidebar {
  width: 250px;
  background-color: var(--surface-color);
  border-right: 1px solid var(--border-color);
  padding: 1rem 0;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  transition: transform 0.3s ease;
  z-index: 1000;
}

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

.sidebar-header {
  padding: 0 1rem 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

.sidebar-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
}

.nav-menu {
  list-style: none;
}

.nav-item {
  margin-bottom: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
}

.nav-link:hover {
  background-color: var(--primary-color);
  color: white;
  border-left-color: var(--primary-dark);
}

.nav-link.active {
  background-color: var(--primary-color);
  color: white;
  border-left-color: var(--primary-dark);
}

.nav-link i {
  margin-right: 0.75rem;
  width: 20px;
}

.main-content {
  flex: 1;
  margin-left: 250px;
  transition: margin-left 0.3s ease;
}

.main-content.expanded {
  margin-left: 0;
}

.header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.content {
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  padding: 1rem;
}

.login-card {
  background: var(--background-color);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}

.login-title {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
}

.role-selection {
  margin-bottom: 2rem;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.role-card {
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--surface-color);
}

.role-card:hover {
  border-color: var(--primary-color);
  background: var(--primary-color);
  color: white;
}

.role-card.selected {
  border-color: var(--primary-color);
  background: var(--primary-color);
  color: white;
}

.role-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.role-name {
  font-weight: 500;
}

.employee-dropdown {
  margin-top: 1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--surface-color);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-header {
  display: flex;
  justify-content: between;
  align-items: center;
  margin-bottom: 1rem;
}

.stat-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-change {
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.stat-change.positive {
  color: var(--success-color);
}

.stat-change.negative {
  color: var(--error-color);
}

.table-container {
  background: var(--surface-color);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

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

.table th,
.table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  background: var(--background-color);
  font-weight: 600;
  color: var(--text-primary);
}

.table tbody tr:hover {
  background: var(--background-color);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

.notification-badge {
  background: var(--error-color);
  color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  position: absolute;
  top: -8px;
  right: -8px;
}

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

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

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

  .sidebar.open {
    transform: translateX(0);
  }

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

  .header {
    padding: 1rem;
  }

  .content {
    padding: 1rem;
  }

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

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