:root {
  /* Colors */
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #64748B;
  --accent: #0EA5E9;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  
  --bg-body: #F1F5F9;
  --bg-surface: #FFFFFF;
  --bg-sidebar: #1E293B;
  
  --text-main: #0F172A;
  --text-secondary: #64748B;
  --text-on-dark: #F8FAFC;
  
  --border-light: #E2E8F0;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  /* Layout */
  --sidebar-width: 260px;
  --header-height: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
}

/* Layout Grid */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  background-color: var(--bg-sidebar);
  color: var(--text-on-dark);
  display: flex;
  flex-direction: column;
  position: fixed;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
}

.logo-area {
  padding: var(--spacing-lg);
  font-size: 1.25rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  letter-spacing: -0.02em;
}

.logo-accent {
  color: var(--accent);
}

.nav-menu {
  padding: var(--spacing-md) 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: #94A3B8;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background-color: rgba(255,255,255,0.05);
  color: var(--text-on-dark);
}

.nav-item.active {
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--text-on-dark);
  border-left-color: var(--primary);
}

.nav-icon {
  width: 20px;
  height: 20px;
  background-color: currentColor;
  margin-right: var(--spacing-md);
  opacity: 0.8;
  border-radius: 2px;
}

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
}

.top-header {
  height: var(--header-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 10;
}

.page-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 0;
}

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

.content-wrapper {
  padding: var(--spacing-xl);
  max-width: 1600px;
  width: 100%;
}

/* Components */
.card {
  background: var(--bg-surface);
  border-radius: 12px;
  border: 1px solid var(--border-light);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  overflow: hidden;
}

.grid-cols-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-lg); }
.grid-cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-lg); }
.grid-cols-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-lg); }

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

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

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

.stat-trend {
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}
.trend-up { color: var(--success); }
.trend-down { color: var(--danger); }

/* Tables */
.table-container {
  overflow-x: auto;
  width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th {
  background-color: #F8FAFC;
  padding: var(--spacing-md);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-light);
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
}

tr:hover td {
  background-color: #F8FAFC;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-size: 0.875rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #6366F1 100%);
  color: white;
  box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 8px -1px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
  background: white;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background: #F8FAFC;
  color: var(--text-main);
}

.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
}

/* Badges */
.badge {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background: #DCFCE7; color: #166534; }
.badge-warning { background: #FEF3C7; color: #92400E; }
.badge-neutral { background: #F1F5F9; color: #475569; }
.badge-danger { background: #FEE2E2; color: #991B1B; }

/* Avatar */
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #CBD5E1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
}

/* Map Placeholder */
.map-placeholder {
  background-color: #E2E8F0;
  border-radius: 8px;
  width: 100%;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  overflow: hidden;
}

.map-pin {
  width: 24px;
  height: 24px;
  background: var(--danger);
  border-radius: 50%;
  border: 3px solid white;
  position: absolute;
  box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

/* Calendar */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background-color: var(--border-light);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
}

.calendar-header {
  background: #F8FAFC;
  padding: 1rem;
  text-align: center;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.calendar-day {
  background: white;
  min-height: 120px;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
}

.calendar-date {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.calendar-event {
  background: #EEF2FF;
  color: var(--primary);
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 4px;
  margin-bottom: 2px;
  border-left: 2px solid var(--primary);
  cursor: pointer;
}

/* Utility */
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.text-right { text-align: right; }
.w-full { width: 100%; }

.search-input {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  width: 250px;
  font-size: 0.875rem;
}

@media (max-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(1, 1fr); }
}

@media (max-width: 768px) {
  .app-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; } /* In a real app this would be a mobile drawer */
  .main-content { margin-left: 0; }
}