/**
 * Design Tokens - Prime Factors Pro
 * Single source of truth for all visual values.
 * Requirements: 2.1, 2.3, 2.4, 2.5, 15.1
 */

:root {
    /* Brand Colors */
    --color-primary: #1B2B4B;
    --color-primary-light: #2D4A7A;
    --color-secondary: #C9A84C;
    --color-secondary-light: #E5C76B;
    --color-accent: #0EA5E9;

    /* Semantic Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;
    --color-info: #3B82F6;

    /* Neutrals (near-white to near-black) */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F8FAFC;
    --color-bg-tertiary: #F1F5F9;
    --color-bg-dark: #0F172A;
    --color-text-primary: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-muted: #94A3B8;
    --color-border: #E2E8F0;

    /* Typography - Font Families */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, 'Courier New', monospace;

    /* Typography - Font Sizes (9 steps) */
    --font-size-xs: 0.75rem;
    --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-size-5xl: 3rem;

    /* Typography - Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Typography - Line Heights (per scale step) */
    --line-height-xs: 1rem;
    --line-height-sm: 1.25rem;
    --line-height-base: 1.5rem;
    --line-height-lg: 1.75rem;
    --line-height-xl: 1.75rem;
    --line-height-2xl: 2rem;
    --line-height-3xl: 2.25rem;
    --line-height-4xl: 2.5rem;
    --line-height-5xl: 1;

    /* Spacing (4px base unit) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --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, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}