/* ============================================
   VARIABLES
   ============================================ */
:root {
  /* Colors - Industrial Dystopian Theme */
  --color-bg-primary: #0a0a0b;
  --color-bg-secondary: #1a1c18;
  --color-bg-tertiary: #2a2d26;
  --color-bg-elevated: #151612;
  
  --color-text-primary: #e8e8e6;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #6b7280;
  
  --color-primary: #39ff14;
  --color-primary-dim: #2ecc71;
  --color-secondary: #d97706;
  --color-secondary-dim: #b45309;
  --color-accent: #4b5563;
  
  --color-success: #39ff14;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;
  --color-danger-dim: #991b1b;
  --color-gray-100: #f3f4f6;
  --color-gray-500: #6b7280;
  --color-gray-700: #374151;
  --color-gray-900: #111827;
  
  /* Typography */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  --font-family-mono: 'SF Mono', Monaco, Inconsolata, 'Fira Code', 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 3rem;
  --font-size-4xl: 4rem;
  
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing Scale (0-96px) */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  
  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.7), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(57, 255, 20, 0.3);
  --shadow-glow-sm: 0 0 10px rgba(57, 255, 20, 0.2);
  
  /* Transitions */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
}

/* ============================================
   RESET
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  background-image: radial-gradient(circle at 50% 0%, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-in-out), 
              text-shadow var(--duration-fast) var(--ease-in-out);
}

a:hover {
  color: var(--color-primary-dim);
  text-shadow: var(--shadow-glow-sm);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================
   UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-8);
  }
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-4 {
  gap: var(--space-4);
}

.flex-wrap {
  flex-wrap: wrap;
}

.grid {
  display: grid;
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

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

/* ============================================
   COMPONENTS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-in-out);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(57, 255, 20, 0.1) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform var(--duration-slow) var(--ease-in-out);
}

.btn:hover::before {
  transform: translateX(100%);
}

.btn:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-sm);
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.4);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-bg-primary)!important;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dim);
  box-shadow: var(--shadow-glow);
}

.btn--secondary {
  background-color: transparent;
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

.btn--secondary:hover {
  background-color: var(--color-secondary);
  color: var(--color-bg-primary);
  box-shadow: 0 0 20px rgba(217, 119, 6, 0.4);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--color-accent);
}

.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-in-out);
}

.input::placeholder {
  color: var(--color-text-muted);
}

.input:hover {
  border-color: var(--color-text-secondary);
}

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2), var(--shadow-glow-sm);
}

.input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-bg-tertiary);
}

.card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-normal) var(--ease-in-out);
  position: relative;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-sm);
}

.card:hover::after {
  opacity: 0.5;
}

.card--featured {
  border-color: var(--color-secondary);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(217, 119, 6, 0.1) 100%);
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .btn::before,
  .card,
  .input,
  a {
    transition: none;
  }
  
  .card:hover,
  .btn:hover {
    transform: none;
  }
}

@media (prefers-contrast: high) {
  :root {
    --color-primary: #00ff00;
    --color-text-primary: #ffffff;
    --color-bg-primary: #000000;
  }
  
  .card, .input, .btn {
    border-width: 2px;
  }
}