/**
 * Design Tokens
 * Central source of truth for all visual properties
 * Inspired by the Ryft Calc app color scheme
 */

:root {
    /* ========================================
       COLOR TOKENS
       ======================================== */
    
    /* Primary Colors - Orange Accent */
    --color-primary-50: #FFF7ED;
    --color-primary-100: #FFEDD5;
    --color-primary-200: #FED7AA;
    --color-primary-300: #FDBA74;
    --color-primary-400: #FB923C;
    --color-primary-500: #E07B39;
    --color-primary-600: #D97706;
    --color-primary-700: #B45309;
    --color-primary-800: #92400E;
    --color-primary-900: #78350F;

    /* Neutral Colors - Dark Theme */
    --color-neutral-0: #FFFFFF;
    --color-neutral-50: #FAFAFA;
    --color-neutral-100: #F5F5F5;
    --color-neutral-200: #E5E5E5;
    --color-neutral-300: #D4D4D4;
    --color-neutral-400: #A3A3A3;
    --color-neutral-500: #737373;
    --color-neutral-600: #525252;
    --color-neutral-700: #404040;
    --color-neutral-800: #262626;
    --color-neutral-850: #1A1A1A;
    --color-neutral-900: #0F0F0F;
    --color-neutral-950: #0A0A0A;

    /* Surface Colors */
    --color-surface-bg: var(--color-neutral-950);
    --color-surface-card: var(--color-neutral-900);
    --color-surface-elevated: var(--color-neutral-850);
    --color-surface-overlay: rgba(0, 0, 0, 0.8);

    /* Button Colors - matches app keypad */
    --color-button-bg: #2A2D3A;
    --color-button-bg-hover: #363A4A;
    --color-button-accent: var(--color-primary-500);
    --color-button-accent-hover: var(--color-primary-400);

    /* Text Colors */
    --color-text-primary: var(--color-neutral-0);
    --color-text-secondary: var(--color-neutral-400);
    --color-text-muted: var(--color-neutral-500);
    --color-text-inverse: var(--color-neutral-950);

    /* Border Colors */
    --color-border-subtle: rgba(255, 255, 255, 0.06);
    --color-border-default: rgba(255, 255, 255, 0.1);
    --color-border-strong: rgba(255, 255, 255, 0.2);

    /* Gradient Colors */
    --gradient-hero: linear-gradient(180deg, var(--color-neutral-950) 0%, var(--color-neutral-900) 100%);
    --gradient-card: linear-gradient(145deg, var(--color-neutral-900) 0%, var(--color-neutral-950) 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(224, 123, 57, 0.15) 0%, transparent 70%);
    --gradient-text: linear-gradient(135deg, var(--color-primary-400) 0%, var(--color-primary-600) 100%);

    /* ========================================
       TYPOGRAPHY TOKENS
       ======================================== */
    
    /* Font Families */
    --font-family-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

    /* Font Sizes */
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;   /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    --font-size-5xl: 3rem;       /* 48px */
    --font-size-6xl: 3.75rem;    /* 60px */
    --font-size-7xl: 4.5rem;     /* 72px */

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Line Heights */
    --line-height-tight: 1.1;
    --line-height-snug: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Letter Spacing */
    --letter-spacing-tighter: -0.05em;
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;

    /* ========================================
       SPACING TOKENS
       ======================================== */
    
    --spacing-0: 0;
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    --spacing-20: 5rem;     /* 80px */
    --spacing-24: 6rem;     /* 96px */
    --spacing-32: 8rem;     /* 128px */

    /* ========================================
       LAYOUT TOKENS
       ======================================== */
    
    --container-max-width: 1200px;
    --container-padding: var(--spacing-6);
    --section-padding-y: var(--spacing-24);

    /* ========================================
       BORDER TOKENS
       ======================================== */
    
    --border-radius-sm: 0.375rem;   /* 6px */
    --border-radius-md: 0.5rem;     /* 8px */
    --border-radius-lg: 0.75rem;    /* 12px */
    --border-radius-xl: 1rem;       /* 16px */
    --border-radius-2xl: 1.5rem;    /* 24px */
    --border-radius-3xl: 2rem;      /* 32px */
    --border-radius-full: 9999px;

    --border-width-thin: 1px;
    --border-width-medium: 2px;
    --border-width-thick: 3px;

    /* ========================================
       SHADOW TOKENS
       ======================================== */
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(224, 123, 57, 0.3);
    --shadow-glow-strong: 0 0 60px rgba(224, 123, 57, 0.4);

    /* ========================================
       ANIMATION TOKENS
       ======================================== */
    
    --duration-instant: 0ms;
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 450ms;
    --duration-slower: 600ms;

    --easing-default: cubic-bezier(0.4, 0, 0.2, 1);
    --easing-in: cubic-bezier(0.4, 0, 1, 1);
    --easing-out: cubic-bezier(0, 0, 0.2, 1);
    --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ========================================
       Z-INDEX TOKENS
       ======================================== */
    
    --z-index-base: 0;
    --z-index-dropdown: 100;
    --z-index-sticky: 200;
    --z-index-fixed: 300;
    --z-index-modal-backdrop: 400;
    --z-index-modal: 500;
    --z-index-popover: 600;
    --z-index-tooltip: 700;
}

/* ========================================
   REDUCED MOTION PREFERENCES
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    :root {
        --duration-instant: 0ms;
        --duration-fast: 0ms;
        --duration-normal: 0ms;
        --duration-slow: 0ms;
        --duration-slower: 0ms;
    }
}