/* EventRipple Design System v2 - Design Tokens */
:root {
  color-scheme: light dark;
  
  /* Action Hierarchy - Blue-based system (Nov 2025) */
  --color-action-primary: hsl(212, 85%, 45%);
  --color-action-primary-hover: hsl(212, 85%, 40%);
  --color-action-primary-bg: hsl(212, 85%, 95%);
  --color-action-secondary: hsl(212, 15%, 45%);
  --color-action-secondary-hover: hsl(212, 15%, 40%);
  --color-action-secondary-bg: hsl(212, 15%, 95%);
  
  /* Neutral Palette */
  --color-bg-page: hsl(212, 25%, 98%);
  --color-bg-surface: hsl(0, 0%, 100%);
  --color-bg-elevated: hsl(0, 0%, 100%);
  --color-bg-muted: hsl(212, 20%, 95%);
  --color-border: hsl(212, 20%, 88%);
  --color-border-strong: hsl(212, 20%, 75%);
  --color-text-primary: hsl(212, 40%, 12%);
  --color-text-secondary: hsl(212, 25%, 40%);
  --color-text-tertiary: hsl(212, 15%, 55%);
  
  /* Semantic Colors */
  --color-success: hsl(152, 65%, 35%);
  --color-success-bg: hsl(152, 60%, 95%);
  --color-warning: hsl(42, 90%, 50%);
  --color-warning-bg: hsl(42, 85%, 95%);
  --color-error: hsl(0, 75%, 50%);
  --color-error-bg: hsl(0, 70%, 95%);
  --color-info: hsl(212, 85%, 50%);
  --color-info-bg: hsl(212, 85%, 95%);
  
  /* On-Color (text on colored backgrounds) */
  --color-on-action-primary: hsl(0, 0%, 100%);
  --color-on-action-secondary: hsl(0, 0%, 100%);
  
  /* Gradients - Blue-based */
  --gradient-action: linear-gradient(135deg, hsl(212, 85%, 45%) 0%, hsl(212, 85%, 55%) 100%);
  --gradient-accent: linear-gradient(135deg, hsl(212, 85%, 45%) 0%, hsl(185, 75%, 38%) 100%);
  
  /* Spacing - 8-point grid */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 2.5rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  
  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Border & Radius */
  --border-width-thin: 1px;
  --border-width-base: 2px;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 hsla(0, 0%, 0%, 0.05);
  --shadow-md: 0 4px 6px -1px hsla(0, 0%, 0%, 0.1), 0 2px 4px -2px hsla(0, 0%, 0%, 0.1);
  --shadow-lg: 0 10px 15px -3px hsla(0, 0%, 0%, 0.1), 0 4px 6px -4px hsla(0, 0%, 0%, 0.1);
  
  /* Motion */
  --duration-fast: 100ms;
  --duration-base: 200ms;
  --duration-moderate: 300ms;
  --easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --easing-emphasized: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Component Sizes */
  --size-target-comfortable: 2.75rem; /* 44px WCAG */
  --size-icon-md: 1.5rem;
  --size-avatar-md: 2.5rem;
  
  /* Z-Index - Unified System */
  --z-index-base: 1;
  --z-index-elevated: 10;
  --z-index-dropdown: 1000;
  --z-index-autocomplete: 1010;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  --z-index-toast: 9999;

  /* Legacy aliases (backwards compatibility) */
  --z-dropdown: var(--z-index-dropdown);
  --z-sticky: var(--z-index-sticky);
  --z-modal: var(--z-index-modal);
  --z-overlay: var(--z-index-modal-backdrop);
  --z-dialog: var(--z-index-modal);
  --z-tooltip: var(--z-index-tooltip);
  --z-fixed: var(--z-index-fixed);
}

/* Dark Mode - System Preference (only when no manual override) */
@media (prefers-color-scheme: dark) {
  :root:not(.light) {
    --color-action-primary: hsl(212, 85%, 60%);
    --color-action-primary-hover: hsl(212, 85%, 65%);
    --color-action-primary-bg: hsl(212, 85%, 15%);
    --color-action-secondary: hsl(212, 15%, 60%);
    --color-action-secondary-hover: hsl(212, 15%, 65%);
    --color-action-secondary-bg: hsl(212, 15%, 15%);
    --color-bg-page: hsl(212, 25%, 8%);
    --color-bg-surface: hsl(212, 25%, 12%);
    --color-bg-elevated: hsl(212, 25%, 16%);
    --color-bg-muted: hsl(212, 20%, 18%);
    --color-border: hsl(212, 20%, 25%);
    --color-border-strong: hsl(212, 20%, 35%);
    --color-text-primary: hsl(212, 30%, 95%);
    --color-text-secondary: hsl(212, 20%, 70%);
    --color-text-tertiary: hsl(212, 15%, 55%);
    --color-success: hsl(152, 65%, 60%);
    --color-success-bg: hsl(152, 60%, 15%);
    --color-warning: hsl(42, 90%, 65%);
    --color-warning-bg: hsl(42, 85%, 15%);
    --color-error: hsl(0, 75%, 65%);
    --color-error-bg: hsl(0, 70%, 15%);
    --color-info: hsl(212, 85%, 65%);
    --color-info-bg: hsl(212, 85%, 15%);
    --color-on-action-primary: hsl(212, 85%, 10%);
    --color-on-action-secondary: hsl(212, 30%, 8%);
    --gradient-action: linear-gradient(135deg, hsl(212, 85%, 60%) 0%, hsl(212, 85%, 70%) 100%);
    --gradient-accent: linear-gradient(135deg, hsl(212, 85%, 60%) 0%, hsl(185, 75%, 60%) 100%);
    --shadow-sm: 0 1px 2px 0 hsla(0, 0%, 0%, 0.3);
    --shadow-md: 0 4px 6px -1px hsla(0, 0%, 0%, 0.4), 0 2px 4px -2px hsla(0, 0%, 0%, 0.3);
    --shadow-lg: 0 10px 15px -3px hsla(0, 0%, 0%, 0.5), 0 4px 6px -4px hsla(0, 0%, 0%, 0.3);
  }
}

/* Dark Mode - Manual Toggle (via .dark class on html element) 
   Higher specificity than @media query to ensure manual toggle always wins */
html.dark {
  --color-action-primary: hsl(212, 85%, 60%);
  --color-action-primary-hover: hsl(212, 85%, 65%);
  --color-action-primary-bg: hsl(212, 85%, 15%);
  --color-action-secondary: hsl(212, 15%, 60%);
  --color-action-secondary-hover: hsl(212, 15%, 65%);
  --color-action-secondary-bg: hsl(212, 15%, 15%);
  --color-bg-page: hsl(212, 25%, 8%);
  --color-bg-surface: hsl(212, 25%, 12%);
  --color-bg-elevated: hsl(212, 25%, 16%);
  --color-bg-muted: hsl(212, 20%, 18%);
  --color-border: hsl(212, 20%, 25%);
  --color-border-strong: hsl(212, 20%, 35%);
  --color-text-primary: hsl(212, 30%, 95%);
  --color-text-secondary: hsl(212, 20%, 70%);
  --color-text-tertiary: hsl(212, 15%, 55%);
  --color-success: hsl(152, 65%, 60%);
  --color-success-bg: hsl(152, 60%, 15%);
  --color-warning: hsl(42, 90%, 65%);
  --color-warning-bg: hsl(42, 85%, 15%);
  --color-error: hsl(0, 75%, 65%);
  --color-error-bg: hsl(0, 70%, 15%);
  --color-info: hsl(212, 85%, 65%);
  --color-info-bg: hsl(212, 85%, 15%);
  --color-on-action-primary: hsl(212, 85%, 10%);
  --color-on-action-secondary: hsl(212, 30%, 8%);
  --gradient-action: linear-gradient(135deg, hsl(212, 85%, 60%) 0%, hsl(212, 85%, 70%) 100%);
  --gradient-accent: linear-gradient(135deg, hsl(212, 85%, 60%) 0%, hsl(185, 75%, 60%) 100%);
  --shadow-sm: 0 1px 2px 0 hsla(0, 0%, 0%, 0.3);
  --shadow-md: 0 4px 6px -1px hsla(0, 0%, 0%, 0.4), 0 2px 4px -2px hsla(0, 0%, 0%, 0.3);
  --shadow-lg: 0 10px 15px -3px hsla(0, 0%, 0%, 0.5), 0 4px 6px -4px hsla(0, 0%, 0%, 0.3);
}