/* ==============================================
   CSS Design Token System - Following Design System Best Practices
   ============================================== */

:root {
  /* Color System - Support for Light/Dark Themes */
  --color-bg-primary: #0b0f14;
  --color-bg-secondary: #111823;
  --color-bg-tertiary: #0b1119;
  --color-text-primary: #e6edf3;
  --color-text-secondary: #8aa0b1;
  --color-text-muted: #6b7785;
  
  /* Brand Colors */
  --color-brand-primary: #69e4a5;
  --color-brand-secondary: #9ad3ff;
  --color-accent: #2563eb;
  --color-success: #23d18b;
  --color-warning: #ffd166;
  --color-error: #ef4444;
  
  /* Borders & Dividers */
  --color-border-primary: #233244;
  --color-border-secondary: #2a3340;
  --color-border-active: #2f5674;
  
  /* Interactive States */
  --color-interactive-default: #1a2230;
  --color-interactive-hover: #1f3a56;
  --color-interactive-active: #21405a;
  
  /* Spacing System - 8px Base Grid */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --space-3xl: 48px;
  --space-4xl: 64px;
  --space-5xl: 80px;
  --space-6xl: 96px;
  
  /* Typography System */
  --font-family-primary: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  
  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;
  --line-height-loose: 1.9;
  
  /* Border Radius System */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadow System */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  
  /* Gradient System */
  --gradient-brand: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-secondary) 100%);
  --gradient-card: linear-gradient(145deg, var(--color-bg-secondary) 0%, rgba(255,255,255,0.02) 100%);
  --gradient-hero: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-tertiary) 100%);
  
  /* Z-index Layers */
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal: 40;
  --z-popover: 50;
  
  /* Layout Constraints */
  --container-max-width: 1200px;
  --grid-gap: 14px;
  
  /* Animations */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.35s ease;
}

/* Light Theme Override */
@media (prefers-color-scheme: light) {
  :root {
    --color-bg-primary: #f7f9fc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-text-primary: #101828;
    --color-text-secondary: #667085;
    --color-text-muted: #9ca3af;
    
    --color-border-primary: #e4e7ec;
    --color-border-secondary: #d1d5db;
    --color-border-active: #3b82f6;
    
    --color-interactive-default: #edf2f7;
    --color-interactive-hover: #e2e8f0;
    --color-interactive-active: #dbeafe;
  }
}

/* Manual Theme Toggle Classes */
html.theme-light {
  --color-bg-primary: #f7f9fc;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f1f5f9;
  --color-text-primary: #101828;
  --color-text-secondary: #667085;
  --color-text-muted: #9ca3af;
  
  --color-border-primary: #e4e7ec;
  --color-border-secondary: #d1d5db;
  --color-border-active: #3b82f6;
  
  --color-interactive-default: #edf2f7;
  --color-interactive-hover: #e2e8f0;
  --color-interactive-active: #dbeafe;
}

html.theme-dark {
  --color-bg-primary: #0b0f14;
  --color-bg-secondary: #111823;
  --color-bg-tertiary: #0b1119;
  --color-text-primary: #e6edf3;
  --color-text-secondary: #8aa0b1;
  --color-text-muted: #6b7785;
  
  --color-border-primary: #233244;
  --color-border-secondary: #2a3340;
  --color-border-active: #2f5674;
  
  --color-interactive-default: #1a2230;
  --color-interactive-hover: #1f3a56;
  --color-interactive-active: #21405a;
}

/* Base Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Accessibility */
a {
  color: var(--color-brand-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container System */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

@media (max-width: 768px) {
  .container {
    padding: var(--space-lg) var(--space-md);
  }
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 980px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 { 
    grid-template-columns: 1fr; 
  }
}

/* Visually Hidden */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}