:root {
  /* Colors - Light Mode */
  --color-primary: #0B192C; /* Navy Blue Accent */
  --color-primary-hover: #1E3E62;
  --color-accent: #007AFF; /* Vibrant electric blue for active states */
  --color-accent-hover: #0056b3;
  --color-bg-base: #F8F9FA;
  --color-bg-surface: rgba(255, 255, 255, 0.85);
  --color-bg-elevated: rgba(255, 255, 255, 0.95);
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #6B7280;
  --color-border: rgba(0, 0, 0, 0.1);
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;

  /* Sidebar styling */
  --sidebar-bg: rgba(255, 255, 255, 0.85);
  --sidebar-text: #1A1A1A;
  --sidebar-text-muted: #6B7280;
  --sidebar-item-hover: rgba(11, 25, 44, 0.1);
  --sidebar-item-active: rgba(11, 25, 44, 0.15);
  --sidebar-border: rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-family-ltr: 'Inter', sans-serif;
  --font-family-rtl: 'IBM Plex Sans Arabic', sans-serif;
  --font-family: var(--font-family-ltr);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;

  /* Layout */
  --sidebar-width: 260px;
  --topbar-height: 72px;
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.03);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
  /* Colors - Dark Mode (Navy Blue Theme) */
  --color-primary: #1E3E62; /* Lighter navy for buttons */
  --color-primary-hover: #2A5384;
  --color-accent: #3B82F6; /* Brighter electric blue for dark mode */
  --color-accent-hover: #60A5FA;
  --color-bg-base: #0B192C; /* Main Navy Blue Background */
  --color-bg-surface: rgba(11, 25, 44, 0.75);
  --color-bg-elevated: rgba(30, 62, 98, 0.85);
  --color-text-primary: #F3F4F6;
  --color-text-secondary: #9CA3AF;
  --color-border: rgba(255, 255, 255, 0.15);
  --color-shadow: rgba(0, 0, 0, 0.5);
  
  --sidebar-bg: rgba(11, 25, 44, 0.75);
  --sidebar-text: #F3F4F6;
  --sidebar-text-muted: #9CA3AF;
  --sidebar-item-hover: rgba(255,255,255,0.08);
  --sidebar-item-active: rgba(255,255,255,0.15);
  --sidebar-border: rgba(255, 255, 255, 0.15);

  --shadow-sm: 0 1px 2px var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
}

[dir="rtl"] {
  --font-family: var(--font-family-rtl);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}