/**
 * CSS Custom Properties (Variables)
 * Defines the design system tokens for the portfolio website
 */

:root {
  /* ===== Color Palette ===== */
  /* Primary Colors - Requirements 3.1-3.6 */
  --color-primary-dark: #111111;
  --color-secondary-dark: #262626;
  --color-mid-tone: #5c5c5c;
  --color-light-accent: #a8a8a8;
  --color-primary-light: #f5f5f5;
  
  /* Utility Colors */
  --color-black: #000000;
  --color-white: #ffffff;
  
  /* Glassmorphism Colors - Requirement 4.5 */
  --glass-bg-dark: rgba(17, 17, 17, 0.7);
  --glass-bg-medium: rgba(38, 38, 38, 0.3);
  --glass-bg-light: rgba(245, 245, 245, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-border-light: rgba(255, 255, 255, 0.1);
  
  /* Semantic Colors - Requirement 3.7 */
  --color-text-primary: var(--color-primary-dark);
  --color-text-secondary: var(--color-secondary-dark);
  --color-text-light: var(--color-primary-light);
  --color-bg-dark: var(--color-primary-dark);
  --color-bg-light: var(--color-primary-light);
  
  /* ===== Spacing System ===== */
  /* Modular spacing scale - Requirement 8.7 */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* ===== Typography System ===== */
  /* Font Families - Requirement 8.1 */
  --font-primary: 'Merriweather', Georgia, 'Times New Roman', serif;
  --font-heading: 'Merriweather', Georgia, 'Times New Roman', serif;
  
  /* Font Sizes - Requirements 8.2, 8.4 */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px - minimum for body text */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  --font-size-4xl: 2.5rem;    /* 40px */
  --font-size-5xl: 3rem;      /* 48px */
  
  /* Line Heights - Requirement 8.3 */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* ===== Responsive Breakpoints ===== */
  /* Requirements 2.1, 2.2, 2.3 */
  --breakpoint-sm: 640px;   /* Mobile landscape */
  --breakpoint-md: 768px;   /* Tablet */
  --breakpoint-lg: 1024px;  /* Desktop */
  --breakpoint-xl: 1280px;  /* Large desktop */
  
  /* ===== Animation Timing ===== */
  /* Requirements 7.4, 7.5 */
  --transition-fast: 150ms;
  --transition-base: 300ms;
  --transition-slow: 500ms;
  --easing-default: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-in: cubic-bezier(0.4, 0, 1, 1);
  --easing-out: cubic-bezier(0, 0, 0.2, 1);
  
  /* ===== Glassmorphism Configuration ===== */
  /* Requirements 4.1, 4.5 */
  /* Blur amounts */
  --blur-sm: 5px;
  --blur-md: 10px;
  --blur-lg: 20px;
  --blur-xl: 30px;
  
  /* Glass opacity levels */
  --glass-opacity-light: 0.1;
  --glass-opacity-medium: 0.3;
  --glass-opacity-heavy: 0.7;

  /* Liquid glass accents */
  --liquid-edge: rgba(255, 255, 255, 0.35);
  --liquid-highlight: rgba(255, 255, 255, 0.22);
  --liquid-shadow-soft: 0 10px 28px rgba(0, 0, 0, 0.14);
  --liquid-shadow-deep: 0 18px 36px rgba(0, 0, 0, 0.2);
  
  /* ===== Layout ===== */
  /* Container max-widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  
  /* Section padding */
  --section-padding-mobile: var(--spacing-3xl);
  --section-padding-desktop: var(--spacing-4xl);
  
  /* ===== 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;
  
  /* ===== Shadows ===== */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* ===== Border Radius ===== */
  --radius-sm: 0.25rem;
  --radius-base: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* ===== Touch Target Size ===== */
  /* Requirement 2.6 - Minimum 44x44px for touch devices */
  --touch-target-min: 44px;
}