/* =====================================================
   CSS Variables - SEO Content Tool Design System
   Refined: Lean, Professional, Enterprise
   ===================================================== */

:root {
   /* ===================
     Primary Colors
     =================== */
   --color-primary: #0D9488;
   --color-primary-hover: #0F766E;
   --color-primary-light: #F0FDFA;
   --color-primary-dark: #115E59;

   /* ===================
     Neutral Colors (Slate Palette - Premium Look)
     =================== */
   --color-bg: #FFFFFF;
   --color-surface: #F8FAFC;
   --color-surface-hover: #F1F5F9;
   --color-border: #E2E8F0;
   --color-border-light: #F1F5F9;

   /* ===================
     Text Colors (Slate - Softer than Cool Gray)
     =================== */
   --color-text: #1E293B;
   --color-text-secondary: #64748B;
   --color-text-muted: #94A3B8;
   --color-text-inverse: #FFFFFF;

   /* ===================
     Feedback Colors
     =================== */
   --color-success: #22C55E;
   --color-success-light: #DCFCE7;
   --color-warning: #F59E0B;
   --color-warning-light: #FEF3C7;
   --color-error: #EF4444;
   --color-error-light: #FEE2E2;
   --color-info: #3B82F6;
   --color-info-light: #DBEAFE;

   /* ===================
     Spacing Scale
     =================== */
   --space-1: 4px;
   --space-2: 8px;
   --space-3: 12px;
   --space-4: 16px;
   --space-5: 20px;
   --space-6: 24px;
   --space-8: 32px;
   --space-10: 40px;
   --space-12: 48px;
   --space-16: 64px;

   /* ===================
     Typography
     =================== */
   --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

   --text-xs: 12px;
   --text-sm: 14px;
   --text-base: 16px;
   --text-lg: 18px;
   --text-xl: 24px;
   --text-2xl: 32px;
   --text-3xl: 40px;

   --font-normal: 400;
   --font-medium: 500;
   --font-semibold: 600;
   --font-bold: 700;

   --line-height-tight: 1.25;
   --line-height-normal: 1.5;
   --line-height-relaxed: 1.75;

   /* Letter spacing for elegance */
   --tracking-tight: -0.02em;
   --tracking-normal: -0.01em;

   /* ===================
     Border Radius (Slightly Larger = Modern)
     =================== */
   --radius-sm: 6px;
   --radius-md: 10px;
   --radius-lg: 14px;
   --radius-xl: 18px;
   --radius-full: 9999px;

   /* ===================
     Shadows (Subtle, Clean)
     =================== */
   --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
   --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
   --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
   --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);

   /* ===================
     Transitions
     =================== */
   --transition-fast: 150ms ease;
   --transition-normal: 200ms ease;
   --transition-slow: 300ms ease;

   /* ===================
     Z-Index Scale
     =================== */
   --z-dropdown: 100;
   --z-sticky: 200;
   --z-modal-backdrop: 300;
   --z-modal: 400;
   --z-tooltip: 500;
   --z-feedback: 600;

   /* ===================
     Container
     =================== */
   --container-max: 1200px;
   --container-padding: 24px;
   --container-padding-mobile: 16px;
}

/* Dark mode support (future - add variables here) */