/* ============================================
   CSS Custom Properties - Design System Tokens
   Electric Products Landing Page
   ============================================ */

:root {
  /* ==========================================
     Color Palette - Electric Products Industry
     ========================================== */
  
  /* Primary Colors - Electric Blue Spectrum */
  --color-primary-50: hsl(210, 100%, 97%);
  --color-primary-100: hsl(210, 100%, 92%);
  --color-primary-200: hsl(210, 100%, 85%);
  --color-primary-300: hsl(210, 100%, 75%);
  --color-primary-400: hsl(210, 95%, 65%);
  --color-primary-500: hsl(210, 90%, 55%);
  --color-primary-600: hsl(210, 85%, 45%);
  --color-primary-700: hsl(210, 80%, 35%);
  --color-primary-800: hsl(210, 75%, 25%);
  --color-primary-900: hsl(210, 70%, 15%);
  
  /* Secondary Colors - Professional Gray Spectrum */
  --color-secondary-50: hsl(220, 15%, 97%);
  --color-secondary-100: hsl(220, 15%, 92%);
  --color-secondary-200: hsl(220, 15%, 85%);
  --color-secondary-300: hsl(220, 15%, 75%);
  --color-secondary-400: hsl(220, 15%, 65%);
  --color-secondary-500: hsl(220, 15%, 55%);
  --color-secondary-600: hsl(220, 15%, 45%);
  --color-secondary-700: hsl(220, 15%, 35%);
  --color-secondary-800: hsl(220, 15%, 25%);
  --color-secondary-900: hsl(220, 15%, 15%);
  
  /* Accent Colors - Energy & Innovation */
  --color-accent-cyan: hsl(185, 85%, 50%);
  --color-accent-cyan-light: hsl(185, 85%, 65%);
  --color-accent-cyan-dark: hsl(185, 85%, 35%);
  
  --color-accent-orange: hsl(25, 95%, 55%);
  --color-accent-orange-light: hsl(25, 95%, 70%);
  --color-accent-orange-dark: hsl(25, 95%, 40%);
  
  --color-accent-green: hsl(145, 70%, 45%);
  --color-accent-green-light: hsl(145, 70%, 60%);
  --color-accent-green-dark: hsl(145, 70%, 30%);
  
  /* Semantic Colors */
  --color-success: hsl(145, 70%, 45%);
  --color-success-light: hsl(145, 70%, 95%);
  --color-success-dark: hsl(145, 70%, 30%);
  
  --color-warning: hsl(45, 95%, 55%);
  --color-warning-light: hsl(45, 95%, 95%);
  --color-warning-dark: hsl(45, 95%, 40%);
  
  --color-error: hsl(0, 85%, 55%);
  --color-error-light: hsl(0, 85%, 95%);
  --color-error-dark: hsl(0, 85%, 40%);
  
  --color-info: hsl(210, 90%, 55%);
  --color-info-light: hsl(210, 90%, 95%);
  --color-info-dark: hsl(210, 90%, 40%);
  
  /* Neutral Colors */
  --color-white: hsl(0, 0%, 100%);
  --color-black: hsl(0, 0%, 0%);
  
  --color-gray-50: hsl(0, 0%, 98%);
  --color-gray-100: hsl(0, 0%, 95%);
  --color-gray-200: hsl(0, 0%, 90%);
  --color-gray-300: hsl(0, 0%, 80%);
  --color-gray-400: hsl(0, 0%, 70%);
  --color-gray-500: hsl(0, 0%, 60%);
  --color-gray-600: hsl(0, 0%, 50%);
  --color-gray-700: hsl(0, 0%, 40%);
  --color-gray-800: hsl(0, 0%, 30%);
  --color-gray-900: hsl(0, 0%, 20%);
  
  /* Text Colors */
  --color-text-primary: hsl(220, 15%, 15%);
  --color-text-secondary: hsl(220, 15%, 35%);
  --color-text-tertiary: hsl(220, 15%, 55%);
  --color-text-inverse: hsl(0, 0%, 100%);
  --color-text-disabled: hsl(220, 15%, 65%);
  
  /* Background Colors */
  --color-background-primary: hsl(0, 0%, 100%);
  --color-background-secondary: hsl(220, 15%, 97%);
  --color-background-tertiary: hsl(220, 15%, 92%);
  --color-background-inverse: hsl(220, 15%, 15%);
  
  /* Border Colors */
  --color-border-light: hsl(220, 15%, 90%);
  --color-border-medium: hsl(220, 15%, 75%);
  --color-border-dark: hsl(220, 15%, 55%);
  
  /* ==========================================
     Typography Scale
     ========================================== */
  
  /* Font Families */
  --font-family-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-secondary: 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'Roboto Mono', 'Courier New', Courier, monospace;
  
  /* Font Sizes - Fluid Typography with clamp() */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-md: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-lg: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-xl: clamp(1.5rem, 1.3rem + 1vw, 1.875rem);
  --font-size-2xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.25rem);
  --font-size-3xl: clamp(2.25rem, 1.9rem + 1.75vw, 3rem);
  --font-size-4xl: clamp(3rem, 2.5rem + 2.5vw, 3.75rem);
  --font-size-5xl: clamp(3.75rem, 3rem + 3.75vw, 4.5rem);
  
  /* Font Weights */
  --font-weight-light: 300;
  --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: 1.2;
  --line-height-snug: 1.375;
  --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 System
     ========================================== */
  
  /* Base Spacing Unit */
  --spacing-unit: 0.25rem;
  
  /* Spacing Scale - Fluid with max() */
  --space-0: 0;
  --space-1: max(0.25rem, 0.5vw);
  --space-2: max(0.5rem, 1vw);
  --space-3: max(0.75rem, 1.5vw);
  --space-4: max(1rem, 2vw);
  --space-5: max(1.25rem, 2.5vw);
  --space-6: max(1.5rem, 3vw);
  --space-8: max(2rem, 4vw);
  --space-10: max(2.5rem, 5vw);
  --space-12: max(3rem, 6vw);
  --space-16: max(4rem, 8vw);
  --space-20: max(5rem, 10vw);
  --space-24: max(6rem, 12vw);
  --space-32: max(8rem, 16vw);
  --space-40: max(10rem, 20vw);
  --space-48: max(12rem, 24vw);
  --space-56: max(14rem, 28vw);
  --space-64: max(16rem, 32vw);
  
  /* ==========================================
     Layout & Container
     ========================================== */
  
  /* Container Max Widths */
  --container-xs: 20rem;
  --container-sm: 24rem;
  --container-md: 28rem;
  --container-lg: 32rem;
  --container-xl: 36rem;
  --container-2xl: 42rem;
  --container-3xl: 48rem;
  --container-4xl: 56rem;
  --container-5xl: 64rem;
  --container-6xl: 72rem;
  --container-7xl: 80rem;
  --container-full: 100%;
  
  /* Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* ==========================================
     Border Radius
     ========================================== */
  
  --radius-none: 0;
  --radius-sm: 0.125rem;
  --radius-base: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;
  
  /* ==========================================
     Shadows
     ========================================== */
  
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-2xl: 0 35px 60px -15px rgba(0, 0, 0, 0.3);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
  --shadow-none: none;
  
  /* Electric Glow Shadows */
  --shadow-glow-primary: 0 0 20px rgba(33, 150, 243, 0.3);
  --shadow-glow-accent: 0 0 20px rgba(0, 188, 212, 0.3);
  --shadow-glow-orange: 0 0 20px rgba(255, 152, 0, 0.3);
  
  /* ==========================================
     Z-Index Scale
     ========================================== */
  
  --z-index-dropdown: 1000;
  --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;
  
  /* ==========================================
     Transitions & Animations
     ========================================== */
  
  /* Transition Durations */
  --duration-instant: 75ms;
  --duration-fast: 150ms;
  --duration-base: 200ms;
  --duration-moderate: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 700ms;
  
  /* Transition Timing Functions */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  
  /* ==========================================
     Opacity Scale
     ========================================== */
  
  --opacity-0: 0;
  --opacity-5: 0.05;
  --opacity-10: 0.1;
  --opacity-20: 0.2;
  --opacity-25: 0.25;
  --opacity-30: 0.3;
  --opacity-40: 0.4;
  --opacity-50: 0.5;
  --opacity-60: 0.6;
  --opacity-70: 0.7;
  --opacity-75: 0.75;
  --opacity-80: 0.8;
  --opacity-90: 0.9;
  --opacity-95: 0.95;
  --opacity-100: 1;
  
  /* ==========================================
     Dynamic Viewport Units
     ========================================== */
  
  --vh: 1vh;
  --dvh: 1dvh;
  --svh: 1svh;
  --lvh: 1lvh;
}

/* ==========================================
   Dark Mode Support
   ========================================== */

@media (prefers-color-scheme: dark) {
  :root {
    /* Primary Colors - Adjusted for dark mode */
    --color-primary-50: hsl(210, 70%, 15%);
    --color-primary-100: hsl(210, 75%, 25%);
    --color-primary-500: hsl(210, 90%, 65%);
    --color-primary-900: hsl(210, 100%, 97%);
    
    /* Text Colors */
    --color-text-primary: hsl(0, 0%, 95%);
    --color-text-secondary: hsl(220, 15%, 75%);
    --color-text-tertiary: hsl(220, 15%, 65%);
    --color-text-inverse: hsl(220, 15%, 15%);
    
    /* Background Colors */
    --color-background-primary: hsl(220, 15%, 10%);
    --color-background-secondary: hsl(220, 15%, 15%);
    --color-background-tertiary: hsl(220, 15%, 20%);
    --color-background-inverse: hsl(0, 0%, 100%);
    
    /* Border Colors */
    --color-border-light: hsl(220, 15%, 25%);
    --color-border-medium: hsl(220, 15%, 35%);
    --color-border-dark: hsl(220, 15%, 45%);
  }
}

/* ==========================================
   High Contrast Mode Support
   ========================================== */

@media (prefers-contrast: high) {
  :root {
    --color-primary-500: hsl(210, 100%, 50%);
    --color-text-primary: hsl(0, 0%, 0%);
    --color-border-medium: hsl(0, 0%, 40%);
  }
}