:root {
  /* Premium Color Palette - Luminous Blue-Gray */
  --color-primary: #0052FF;
  --color-primary-dark: #0041CC;
  --color-primary-light: #3374FF;
  --color-primary-subtle: rgba(0, 82, 255, 0.04);
  --color-primary-hover: rgba(0, 82, 255, 0.08);

  --color-accent: #7C3AED;
  --color-accent-light: #A78BFA;
  --color-accent-subtle: rgba(124, 58, 237, 0.04);

  --color-success: #10B981;
  --color-error: #EF4444;
  --color-warning: #F59E0B;
  --color-info: #3B82F6;

  /* Sophisticated Neutral Scale */
  --color-bg: #FAFAFA;
  --color-bg-secondary: #FFFFFF;
  --color-bg-tertiary: #F5F5F5;
  --color-bg-elevated: #FFFFFF;
  --color-bg-hover: #F9FAFB;
  --color-surface: #FFFFFF;

  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94A3B8;
  --color-text-muted: #CBD5E1;

  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-border-hover: #CBD5E1;

  /* Refined Shadows - Layered Depth */
  --shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.02);
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.04), 0 1px 2px -1px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(15, 23, 42, 0.15);

  /* Generous Spacing - Breathing Room */
  --spacing-xxs: 0.25rem; /* 4px */
  --spacing-xs: 0.5rem; /* 8px */
  --spacing-sm: 0.75rem; /* 12px */
  --spacing-md: 1rem; /* 16px */
  --spacing-lg: 1.5rem; /* 24px */
  --spacing-xl: 2rem; /* 32px */
  --spacing-2xl: 2.5rem; /* 40px */
  --spacing-3xl: 3rem; /* 48px */
  --spacing-4xl: 4rem; /* 64px */
  --spacing-5xl: 5rem; /* 80px */

  /* Modern Border Radius - Soft & Refined */
  --radius-xs: 0.375rem; /* 6px */
  --radius-sm: 0.5rem; /* 8px */
  --radius-md: 0.75rem; /* 12px */
  --radius-lg: 1rem; /* 16px */
  --radius-xl: 1.25rem; /* 20px */
  --radius-2xl: 1.5rem; /* 24px */
  --radius-3xl: 2rem; /* 32px */
  --radius-circle: 50%;

  /* Fluid Transitions - Spring-Based */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Premium Typography - Distinctive Fonts */
  --font-display: 'Cabinet Grotesk', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', ui-monospace, 'Cascadia Code', monospace;

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Layout Dimensions - Spacious */
  --sidebar-width: 260px;
  --header-height: 64px;
  --content-max-width: 1600px;

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* Blur Effects */
  --blur-sm: blur(8px);
  --blur-md: blur(12px);
  --blur-lg: blur(20px);
}

/* Dark Mode - Sophisticated Dark Palette */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0F172A;
    --color-bg-secondary: #1E293B;
    --color-bg-tertiary: #334155;
    --color-bg-elevated: #1E293B;
    --color-bg-hover: #2D3B4E;
    --color-surface: #1E293B;

    --color-text: #F1F5F9;
    --color-text-secondary: #CBD5E1;
    --color-text-tertiary: #94A3B8;
    --color-text-muted: #64748B;

    --color-border: #334155;
    --color-border-light: #1E293B;
    --color-border-hover: #475569;

    --color-primary-subtle: rgba(0, 82, 255, 0.12);
    --color-primary-hover: rgba(0, 82, 255, 0.18);
    --color-accent-subtle: rgba(124, 58, 237, 0.12);

    /* Enhanced shadows for dark mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.8), 0 8px 10px -6px rgba(0, 0, 0, 0.6);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.9);
  }
}

/* Font Loading - Web Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap');