:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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;
    --font-size-6xl: 3.75rem;
    
    --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-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    --spacing-0: 0;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    --spacing-32: 8rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1320px;
    
    --header-height: 80px;
    --header-height-scrolled: 70px;
    
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-tooltip: 600;
}

[data-theme="light"] {
    --color-bg: #F6F7FB;
    --color-bg-alt: #EBEDF3;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F9FAFB;
    --color-surface-active: #F3F4F6;
    
    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;
    --color-border-dark: #D1D5DB;
    
    --color-text: #111827;
    --color-text-secondary: #4B5563;
    --color-text-muted: #6B7280;
    --color-text-light: #9CA3AF;
    
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-light: #DBEAFE;
    --color-primary-dark: #1E40AF;
    
    --color-secondary: #0EA5A4;
    --color-secondary-hover: #0D9488;
    --color-secondary-light: #CCFBF1;
    
    --color-accent: #F59E0B;
    --color-accent-hover: #D97706;
    --color-accent-light: #FEF3C7;
    
    --color-success: #10B981;
    --color-success-light: #D1FAE5;
    --color-warning: #F59E0B;
    --color-warning-light: #FEF3C7;
    --color-error: #EF4444;
    --color-error-light: #FEE2E2;
    --color-info: #3B82F6;
    --color-info-light: #DBEAFE;
    
    --shadow-card: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-card-hover: 0 10px 40px rgba(0,0,0,0.12);
    --shadow-dropdown: 0 10px 40px rgba(0,0,0,0.15);
    
    --gradient-primary: linear-gradient(135deg, #2563EB 0%, #0EA5A4 100%);
    --gradient-hero: linear-gradient(135deg, #F6F7FB 0%, #DBEAFE 50%, #CCFBF1 100%);
    --gradient-card: linear-gradient(180deg, #FFFFFF 0%, #F9FAFB 100%);
    
    --header-bg: rgba(255, 255, 255, 0.95);
    --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --color-bg: #0B1220;
    --color-bg-alt: #0F172A;
    --color-surface: #111A2E;
    --color-surface-hover: #1E293B;
    --color-surface-active: #334155;
    
    --color-border: #1E293B;
    --color-border-light: #334155;
    --color-border-dark: #475569;
    
    --color-text: #F1F5F9;
    --color-text-secondary: #CBD5E1;
    --color-text-muted: #94A3B8;
    --color-text-light: #64748B;
    
    --color-primary: #3B82F6;
    --color-primary-hover: #60A5FA;
    --color-primary-light: #1E3A5F;
    --color-primary-dark: #2563EB;
    
    --color-secondary: #14B8A6;
    --color-secondary-hover: #2DD4BF;
    --color-secondary-light: #134E4A;
    
    --color-accent: #FBBF24;
    --color-accent-hover: #FCD34D;
    --color-accent-light: #422006;
    
    --color-success: #22C55E;
    --color-success-light: #14532D;
    --color-warning: #FBBF24;
    --color-warning-light: #422006;
    --color-error: #F87171;
    --color-error-light: #7F1D1D;
    --color-info: #60A5FA;
    --color-info-light: #1E3A5F;
    
    --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
    --shadow-card-hover: 0 20px 50px rgba(0,0,0,0.4);
    --shadow-dropdown: 0 10px 40px rgba(0,0,0,0.5);
    
    --gradient-primary: linear-gradient(135deg, #3B82F6 0%, #14B8A6 100%);
    --gradient-hero: linear-gradient(135deg, #0B1220 0%, #1E3A5F 50%, #134E4A 100%);
    --gradient-card: linear-gradient(180deg, #111A2E 0%, #0F172A 100%);
    
    --header-bg: rgba(11, 18, 32, 0.95);
    --header-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}