:root {
  /* Brand Colors */
  --color-primary: #C71C1C;           /* York Red */
  --color-secondary: #003366;         /* York Blue */
  --color-success: #28a745;
  --color-danger: #dc3545;
  --color-warning: #ffc107;
  --color-info: #17a2b8;
  --color-light: #f8f9fa;
  --color-dark: #343a40;
  --color-muted: #6c757d;
  
  /* Extended Colors */
  --color-primary-light: #e8d5d5;
  --color-primary-dark: #8b0f0f;
  --color-secondary-light: #4d7a99;
  --color-secondary-dark: #001f3f;
  
  /* Typography */
  --font-family-base: "IBM Plex Sans" -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: "IBM Plex Sans" "Georgia", "Garamond", serif;
  --font-family-mono: "Courier New", monospace;
  
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-h1: 2rem;
  --font-size-h2: 1.75rem;
  --font-size-h3: 1.5rem;
  --font-size-h4: 1.25rem;
  --font-size-h5: 1.1rem;
  --font-size-h6: 1rem;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-base: 1.5;
  --line-height-heading: 1.2;
  
  /* Spacing System */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border & Radius */
  --border-radius: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 1rem;
  --border-width: 1px;
  --border-color: #dee2e6;
  
  /* Shadows */
  --box-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  --box-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --box-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --box-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-base: all 200ms ease;
  --transition-fade: opacity 150ms ease;
  --transition-slide: transform 200ms ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Light Theme (Default) */
html[data-bs-theme="light"],
html:not([data-bs-theme]) {
  color-scheme: light;
}

html[data-bs-theme="light"] body,
html:not([data-bs-theme]) body {
  background-color: #fff;
  color: #212529;
}

html[data-bs-theme="light"] .admin-header,
html:not([data-bs-theme]) .admin-header {
  background-color: #fff;
  border-bottom-color: #dee2e6;
}

html[data-bs-theme="light"] .admin-header.bg-white,
html:not([data-bs-theme]) .admin-header.bg-white {
  background-color: #fff !important;
}

html[data-bs-theme="light"] .btn-link.text-dark,
html:not([data-bs-theme]) .btn-link.text-dark {
  color: #212529 !important;
}

html[data-bs-theme="light"] .admin-sidebar,
html:not([data-bs-theme]) .admin-sidebar {
  background-color: #f8f9fa;
}

html[data-bs-theme="light"] .admin-shell,
html:not([data-bs-theme]) .admin-shell {
  background-color: #fff;
}