/**
 * CURE BATUMI - CSS Variables System
 * 
 * @author    Gocha Shevardnadze <shevardnadze@yahoo.com>
 * @company   Fix-Dev.com
 * @since     2025
 * 
 * This file contains all CSS custom properties (variables) used throughout the project.
 * Using CSS variables provides:
 * - Centralized theme management
 * - Easy customization
 * - Better maintainability
 * - Dark mode support
 * - Dynamic theming capabilities
 */

:root {
  /* ============================================
     BRAND COLORS
     ============================================ */
  --color-primary: #5dade2;
  --color-primary-dark: #4a9dd1;
  --color-primary-light: #7ec8e3;
  --color-secondary: #bee3f8;
  --color-accent: #eaf7ff;
  --color-accent-dark: #a7d3f3;

  /* ============================================
     NEUTRAL COLORS
     ============================================ */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d3d3d3;
  --color-gray-400: #cbcbcb;
  --color-gray-500: #939393;
  --color-gray-600: #666666;
  --color-gray-700: #4b5563;
  --color-gray-800: #272727;
  --color-gray-900: #262626;

  /* ============================================
     SEMANTIC COLORS
     ============================================ */
  --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;

  /* ============================================
     TEXT COLORS
     ============================================ */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-500);
  --color-text-inverse: var(--color-white);

  /* ============================================
     BACKGROUND COLORS
     ============================================ */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-100);
  --color-bg-tertiary: var(--color-gray-50);
  --color-bg-overlay: rgba(0, 0, 0, 0.5);

  /* ============================================
     BORDER COLORS
     ============================================ */
  --color-border-light: var(--color-gray-200);
  --color-border-medium: var(--color-gray-300);
  --color-border-dark: var(--color-gray-400);

  /* ============================================
     SPACING SYSTEM (8px base)
     ============================================ */
  --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 */

  /* Semantic spacing */
  --spacing-xs: var(--spacing-2);
  --spacing-sm: var(--spacing-4);
  --spacing-md: var(--spacing-6);
  --spacing-lg: var(--spacing-8);
  --spacing-xl: var(--spacing-12);
  --spacing-2xl: var(--spacing-16);
  --spacing-3xl: var(--spacing-20);

  /* ============================================
     TYPOGRAPHY
     ============================================ */
  
  /* Font Families */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-family-heading: var(--font-family-base);
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', 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-size-8xl: 6rem;        /* 96px */

  /* 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-none: 1;
  --line-height-tight: 1.25;
  --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;

  /* ============================================
     BORDER RADIUS
     ============================================ */
  --radius-none: 0;
  --radius-sm: 0.375rem;    /* 6px */
  --radius-base: 0.5rem;    /* 8px */
  --radius-md: 0.75rem;     /* 12px */
  --radius-lg: 1rem;        /* 16px */
  --radius-xl: 1.25rem;     /* 20px */
  --radius-2xl: 1.5rem;     /* 24px */
  --radius-3xl: 1.875rem;   /* 30px */
  --radius-full: 9999px;

  /* ============================================
     SHADOWS
     ============================================ */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* Colored shadows */
  --shadow-primary: 0 5px 15px rgba(93, 173, 226, 0.3);
  --shadow-primary-lg: 0 8px 20px rgba(93, 173, 226, 0.4);

  /* ============================================
     TRANSITIONS
     ============================================ */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 700ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Easing functions */
  --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);

  /* ============================================
     Z-INDEX SCALE
     ============================================ */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-notification: 1080;

  /* ============================================
     BREAKPOINTS (for reference in JS)
     ============================================ */
  --breakpoint-xs: 360px;
  --breakpoint-sm: 480px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1440px;
  --breakpoint-3xl: 1600px;

  /* ============================================
     CONTAINER WIDTHS
     ============================================ */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  --container-max: 1728px;

  /* ============================================
     COMPONENT SPECIFIC
     ============================================ */
  
  /* Header */
  --header-height: 84px;
  --header-height-mobile: 64px;
  --header-padding: var(--spacing-5);
  --header-padding-mobile: var(--spacing-4);

  /* Hero */
  --hero-height: 969px;
  --hero-height-tablet: 700px;
  --hero-height-mobile: 500px;

  /* Cards */
  --card-padding: var(--spacing-10);
  --card-padding-mobile: var(--spacing-6);
  --card-radius: var(--radius-3xl);

  /* Buttons */
  --button-padding-y: var(--spacing-3);
  --button-padding-x: var(--spacing-10);
  --button-radius: var(--radius-full);
  --button-font-size: var(--font-size-xl);

  /* Forms */
  --input-height: 56px;
  --input-padding-x: var(--spacing-5);
  --input-radius: var(--radius-3xl);
  --input-border-width: 1px;

  /* ============================================
     ANIMATIONS
     ============================================ */
  --animation-duration-fast: 200ms;
  --animation-duration-base: 300ms;
  --animation-duration-slow: 500ms;
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
  /* Colors */
  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #2d2d2d;
  --color-bg-tertiary: #3a3a3a;
  --color-bg-overlay: rgba(0, 0, 0, 0.7);

  --color-text-primary: #ffffff;
  --color-text-secondary: #b3b3b3;
  --color-text-muted: #808080;

  --color-border-light: #3a3a3a;
  --color-border-medium: #4a4a4a;
  --color-border-dark: #5a5a5a;

  --color-primary: #7ec8e3;
  --color-primary-dark: #5dade2;
  --color-primary-light: #9dd9f0;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* Auto dark mode based on system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #2d2d2d;
    --color-bg-tertiary: #3a3a3a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b3b3b3;
    --color-text-muted: #808080;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  :root {
    --color-bg-primary: white;
    --color-text-primary: black;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
    --animation-duration-fast: 0ms;
    --animation-duration-base: 0ms;
    --animation-duration-slow: 0ms;
  }
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0066cc;
    --color-text-primary: #000000;
    --color-border-medium: #000000;
  }
}