/**
 * PigPigDog Design System - CSS Variables
 * Apple-inspired minimalist design with gold-white-gray palette
 */

/* ==================== COLOR SYSTEM ==================== */

/* Primary Colors */
:root {
  /* Background Colors */
  --color-white: #FFFFFF;
  --color-light-gray: #F8F9FA;
  --color-medium-gray: #E9ECEF;
  
  /* Gold Palette */
  --color-gold-light: #F5E8C7;
  --color-gold-medium: #E6C9A8;
  --color-gold-accent: #B8860B;
  
  /* Text Colors */
  --color-text-dark: #2C3E50;
  --color-text-medium: #6C757D;
  --color-text-light: #E0E0E0;
  
  /* Accent Colors */
  --color-blue-dark: #1E3A8A;
  --color-blue-accent: #3B82F6;
  
  /* Functional Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-white: #121212;
    --color-light-gray: #1E1E1E;
    --color-medium-gray: #2D2D2D;
    
    /* Gold with reduced saturation in dark mode */
    --color-gold-light: #D4C4A8;
    --color-gold-medium: #C9B090;
    --color-gold-accent: #A67C00;
    
    --color-text-dark: #E0E0E0;
    --color-text-medium: #B0B0B0;
  }
}

/* ==================== TYPOGRAPHY SYSTEM ==================== */

:root {
  /* Font Families */
  --font-family-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Inter', sans-serif;
  --font-family-body: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Inter', sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Courier New', monospace;
  
  /* Font Sizes - 4px grid system */
  --font-size-h1: 48px;
  --font-size-h2: 36px;
  --font-size-h3: 24px;
  --font-size-h4: 20px;
  --font-size-body-large: 18px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-caption: 12px;
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.4;
  --line-height-relaxed: 1.6;
  
  /* Font Weights */
  --font-weight-bold: 700;
  --font-weight-semibold: 600;
  --font-weight-medium: 500;
  --font-weight-regular: 400;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.01em;
  --letter-spacing-normal: 0;
}

/* Responsive Font Sizes */
@media (max-width: 768px) {
  :root {
    --font-size-h1: 36px;
    --font-size-h2: 28px;
    --font-size-h3: 20px;
    --font-size-h4: 18px;
    --font-size-body-large: 16px;
    --font-size-body: 14px;
  }
}

/* ==================== SPACING SYSTEM ==================== */

:root {
  /* 4px grid system */
  --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;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* ==================== BORDER RADIUS ==================== */

:root {
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
}

/* ==================== SHADOWS ==================== */

:root {
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-2xl: 0 16px 64px rgba(0, 0, 0, 0.24);
}

/* ==================== ANIMATION DURATIONS ==================== */

:root {
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 700ms;
  
  --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);
  --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ==================== Z-INDEX LAYERS ==================== */

:root {
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ==================== BREAKPOINTS ==================== */

:root {
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ==================== COMPONENT SPECIFIC ==================== */

/* Navigation */
:root {
  --nav-height-mobile: 64px;
  --nav-height-desktop: 72px;
  --nav-background: rgba(255, 255, 255, 0.8);
  --nav-backdrop-filter: blur(20px);
}

/* Cards */
:root {
  --card-radius: 12px;
  --card-padding: 24px;
  --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* Buttons */
:root {
  --button-radius: 8px;
  --button-padding-vertical: 12px;
  --button-padding-horizontal: 24px;
  --button-height-large: 48px;
  --button-height-medium: 40px;
  --button-height-small: 32px;
}

/* Forms */
:root {
  --input-height: 44px;
  --input-radius: 8px;
  --input-border: 1px solid #E0E0E0;
  --input-border-focus: 2px solid var(--color-gold-medium);
}

/* ==================== UTILITY CLASSES ==================== */

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Text Colors */
.text-primary { color: var(--color-text-dark); }
.text-secondary { color: var(--color-text-medium); }
.text-accent { color: var(--color-gold-accent); }
.text-blue { color: var(--color-blue-dark); }

/* Background Colors */
.bg-white { background-color: var(--color-white); }
.bg-light { background-color: var(--color-light-gray); }
.bg-gold { background-color: var(--color-gold-light); }

/* Spacing Utilities */
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

/* Display Utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* Flexbox Utilities */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Border Radius */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }