/* =============================================================================
   ENHANCED YEAR 2038 WEBSITE STYLES - BLACK BACKGROUND VERSION
   ============================================================================= */

:root {
  /* Primitive Color Tokens - Updated for Black Theme */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(0, 0, 0, 1);          /* Changed to black */
  --color-cream-100: rgba(10, 10, 10, 1);      /* Very dark gray */
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(0, 0, 0, 1);      /* Changed to black */
  --color-charcoal-800: rgba(5, 5, 5, 1);      /* Very dark */
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* Terminal/UNIX Colors */
  --color-terminal-green: rgba(0, 255, 0, 1);
  --color-terminal-green-dim: rgba(0, 200, 0, 1);
  --color-terminal-amber: rgba(255, 191, 0, 1);
  --color-terminal-phosphor: rgba(0, 255, 65, 1);
  --color-terminal-bg: rgba(0, 0, 0, 1);        /* Pure black */

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;
  --color-teal-300-rgb: 50, 184, 198;
  --color-gray-300-rgb: 167, 169, 169;
  --color-gray-200-rgb: 245, 245, 245;
  --color-gray-400-rgb: 119, 124, 124;
  --color-terminal-green-rgb: 0, 255, 0;
  --color-terminal-phosphor-rgb: 0, 255, 65;

  /* Enhanced glow effects */
  --glow-primary: 0 0 20px rgba(var(--color-primary-rgb, 33, 128, 141), 0.4);
  --glow-error: 0 0 20px rgba(var(--color-red-400-rgb), 0.4);
  --glow-success: 0 0 15px rgba(var(--color-teal-300-rgb), 0.5);
  --glow-terminal: 0 0 10px rgba(var(--color-terminal-green-rgb), 0.6);

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "JetBrains Mono", "Fira Code", "Source Code Pro", "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-family-terminal: "JetBrains Mono", "Fira Code", "Source Code Pro", monospace;

  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-glow: 2s;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;

  /* Semantic Colors - Updated for Black Theme */
  --color-background: var(--color-black);          /* Pure black */
  --color-surface: rgba(15, 15, 15, 1);           /* Very dark surface */
  --color-text: var(--color-gray-200);            /* Light text */
  --color-text-secondary: var(--color-gray-300);   /* Secondary text */
  --color-primary: var(--color-teal-300);          /* Brighter primary for contrast */
  --color-primary-hover: var(--color-teal-400);
  --color-primary-active: var(--color-teal-500);
  --color-secondary: rgba(40, 40, 40, 1);          /* Dark secondary */
  --color-btn-primary-text: var(--color-black);
  --color-card-border: rgba(60, 60, 60, 1);        /* Dark borders */
  --color-border: rgba(60, 60, 60, 1);             /* Dark borders */
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-black);  /* Ensure body is black */
}

*, *::before, *::after {
  box-sizing: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); color: var(--color-gray-200); }
h3 { font-size: var(--font-size-2xl); color: var(--color-gray-200); }
h4 { font-size: var(--font-size-xl); color: var(--color-gray-200); }

p {
  margin: 0 0 var(--space-16) 0;
  color: var(--color-gray-300);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

/* UNIX TERMINAL HEADER STYLING */
.terminal-header {
  margin-bottom: var(--space-32);
  background: var(--color-terminal-bg);
  border-radius: var(--radius-base);
  padding: var(--space-24);
  border: 2px solid var(--color-terminal-green);
  box-shadow: 
    0 0 20px rgba(var(--color-terminal-green-rgb), 0.3),
    inset 0 0 20px rgba(var(--color-terminal-green-rgb), 0.1);
  position: relative;
  overflow: hidden;
}

.terminal-prompt {
  font-family: var(--font-family-terminal);
  font-size: var(--font-size-sm);
  color: var(--color-terminal-green);
  margin-bottom: var(--space-16);
  display: flex;
  align-items: center;
}

.prompt-symbol {
  color: var(--color-terminal-amber);
  margin-right: var(--space-8);
  text-shadow: var(--glow-terminal);
  animation: terminal-blink 1.5s infinite;
}

.prompt-text {
  color: var(--color-terminal-green);
  text-shadow: var(--glow-terminal);
  font-weight: 500;
}

.unix-title {
  font-family: var(--font-family-terminal);
  font-weight: 600;
  line-height: 1.1;
}

.title-line-1 {
  display: block;
  font-size: 2.5rem;
  color: var(--color-terminal-phosphor);
  text-shadow: 
    0 0 10px currentColor,
    0 0 20px currentColor,
    0 0 30px currentColor;
  margin-bottom: var(--space-8);
  animation: terminal-glow 3s ease-in-out infinite alternate;
}

.title-line-2 {
  display: block;
  font-size: 1.5rem;
  color: var(--color-terminal-green-dim);
  text-shadow: 
    0 0 8px currentColor,
    0 0 16px currentColor;
  opacity: 0.9;
  font-weight: 400;
  letter-spacing: 0.02em;
}

@keyframes terminal-blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0.3; }
}

@keyframes terminal-glow {
  0% { 
    text-shadow: 
      0 0 10px currentColor,
      0 0 20px currentColor,
      0 0 30px currentColor;
  }
  100% { 
    text-shadow: 
      0 0 15px currentColor,
      0 0 30px currentColor,
      0 0 45px currentColor;
  }
}

/* Enhanced External Link Styling */
.external-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  text-decoration: none;
  transition: all 0.2s ease;
  border-bottom: 1px solid transparent;
}

.external-link:hover {
  color: var(--color-primary-hover);
  border-bottom-color: var(--color-primary);
  text-shadow: 0 0 8px rgba(var(--color-teal-300-rgb), 0.4);
  transform: translateX(2px);
}

.external-link::after {
  content: '↗';
  margin-left: var(--space-4);
  font-size: var(--font-size-sm);
  opacity: 0.7;
  transition: all 0.2s ease;
}

.external-link:hover::after {
  opacity: 1;
  transform: translate(2px, -2px);
}

/* Hero Section - Black Background */
.hero {
  background: var(--color-black);
  color: var(--color-cream-50);
  padding: var(--space-32) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 30% 20%, rgba(255, 84, 89, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(50, 184, 198, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

/* ENHANCED COUNTDOWN TIMER WITH NEON EFFECTS */
.countdown {
  display: flex;
  justify-content: center;
  gap: var(--space-24);
  margin-bottom: var(--space-32);
  flex-wrap: wrap;
  filter: drop-shadow(0 0 20px rgba(var(--color-red-400-rgb), 0.3));
}

.countdown__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(145deg, rgba(255, 84, 89, 0.15), rgba(255, 84, 89, 0.08));
  border: 2px solid var(--color-red-400);
  border-radius: var(--radius-lg);
  padding: var(--space-20);
  min-width: 90px;
  position: relative;
  box-shadow: 
    0 0 20px rgba(var(--color-red-400-rgb), 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.countdown__item:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 
    0 8px 25px rgba(var(--color-red-400-rgb), 0.5),
    0 0 30px rgba(var(--color-red-400-rgb), 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.countdown__number {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-red-400);
  line-height: 1;
  font-family: var(--font-family-mono);
  text-shadow: 
    0 0 10px currentColor,
    0 0 20px currentColor,
    0 0 30px currentColor;
  transition: all 0.15s ease;
}

.countdown__label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-300);
  margin-top: var(--space-6);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: var(--font-weight-medium);
}

/* Critical Date Display */
.critical-date {
  background: linear-gradient(145deg, rgba(255, 84, 89, 0.2), rgba(255, 84, 89, 0.1));
  border: 2px solid var(--color-red-400);
  border-radius: var(--radius-base);
  padding: var(--space-12) var(--space-20);
  display: inline-block;
  animation: pulse-glow var(--duration-glow) infinite alternate;
}

@keyframes pulse-glow {
  0% {
    box-shadow: 0 0 20px rgba(var(--color-red-400-rgb), 0.3);
  }
  100% {
    box-shadow: 0 0 30px rgba(var(--color-red-400-rgb), 0.5);
  }
}

.critical-date__label {
  color: var(--color-gray-300);
  font-size: var(--font-size-sm);
  margin-right: var(--space-8);
}

.critical-date__value {
  color: var(--color-red-400);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  font-family: var(--font-family-mono);
}

/* Cards - Black Theme */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  border-color: rgba(var(--color-teal-300-rgb), 0.3);
}

.card__body {
  padding: var(--space-16);
}

.card h3 {
  color: var(--color-teal-300);
  margin-bottom: var(--space-12);
}

/* Container */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-16);
  max-width: var(--container-lg);
}

/* Main content - Black Background */
main {
  padding: var(--space-32) 0;
  background-color: var(--color-black);
}

section {
  margin-bottom: var(--space-32);
  background-color: var(--color-black);
}

section h2 {
  margin-bottom: var(--space-24);
  color: var(--color-gray-200);
  text-align: center;
}

/* Grids */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
}

.stories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-24);
}

.systems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-24);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-24);
}

/* Timeline - Black Background */
.timeline-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
  margin: var(--space-32) 0;
  border: 1px solid var(--color-card-border);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-32);
  width: 50%;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
  padding-right: var(--space-24);
}

.timeline-item:nth-child(even) {
  left: 50%;
  text-align: left;
  padding-left: var(--space-24);
}

.timeline-marker {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  top: 0;
  z-index: 2;
}

.timeline-item:nth-child(odd) .timeline-marker {
  right: -8px;
}

.timeline-item:nth-child(even) .timeline-marker {
  left: -8px;
}

.timeline-item--past .timeline-marker {
  background: var(--color-teal-500);
  border: 2px solid var(--color-surface);
}

.timeline-item--current .timeline-marker {
  background: var(--color-orange-500);
  border: 2px solid var(--color-surface);
}

.timeline-item--critical .timeline-marker {
  background: var(--color-red-400);
  border: 2px solid var(--color-surface);
}

.timeline-item--future .timeline-marker {
  background: var(--color-text-secondary);
  border: 2px solid var(--color-surface);
}

.timeline-content h3 {
  color: var(--color-gray-200);
}

.timeline-content p {
  color: var(--color-gray-300);
}

/* Lists */
.incidents-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.incident-card {
  background: rgba(255, 84, 89, 0.1);
  border-left: 4px solid var(--color-red-400);
}

.incident-date {
  font-size: var(--font-size-sm);
  color: var(--color-red-400);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-8);
}

/* Code and technical elements */
code, pre {
  font-family: var(--font-family-mono);
  font-size: calc(var(--font-size-base) * 0.95);
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
  color: var(--color-gray-200);
}

code {
  padding: var(--space-1) var(--space-4);
}

pre {
  padding: var(--space-16);
  margin: var(--space-16) 0;
  overflow: auto;
  border: 1px solid var(--color-border);
  background-color: rgba(20, 20, 20, 1);
}

pre code {
  background: none;
  padding: 0;
  color: var(--color-terminal-green);
}

.timestamp {
  font-family: var(--font-family-mono);
  color: var(--color-red-400);
  background: rgba(255, 84, 89, 0.1);
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 84, 89, 0.3);
}

.math-display {
  font-family: var(--font-family-mono);
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  padding: var(--space-16);
  margin: var(--space-16) 0;
  color: var(--color-terminal-green);
}

/* Lists styling */
ul {
  color: var(--color-gray-300);
}

li {
  margin-bottom: var(--space-8);
  color: var(--color-gray-300);
}

/* Footer - Black Background */
.footer {
  background: var(--color-black);
  padding: var(--space-24) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-32);
  text-align: left;
  margin-bottom: var(--space-24);
}

.footer-grid h4 {
  color: var(--color-primary);
  margin-bottom: var(--space-12);
  font-size: var(--font-size-lg);
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li {
  margin-bottom: var(--space-8);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  color: var(--color-text-secondary);
}

.footer-content p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-gray-300);
}

.footer-content a {
  color: var(--color-primary);
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  .terminal-header {
    padding: var(--space-16);
  }

  .title-line-1 {
    font-size: 2rem;
  }

  .title-line-2 {
    font-size: 1.2rem;
  }

  .countdown {
    gap: var(--space-16);
  }

  .countdown__item {
    min-width: 70px;
    padding: var(--space-12);
  }

  .countdown__number {
    font-size: var(--font-size-2xl);
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    left: 0;
    text-align: left;
    padding-left: var(--space-32);
    padding-right: 0;
  }

  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    left: 0;
    text-align: left;
    padding-left: var(--space-32);
    padding-right: 0;
  }

  .timeline-item:nth-child(odd) .timeline-marker,
  .timeline-item:nth-child(even) .timeline-marker {
    left: 12px;
    right: auto;
  }

  .stories-grid,
  .tech-grid,
  .systems-grid,
  .solutions-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-24);
  }
}

/* Enhanced visual effects for black theme */
.story-card:hover h3 {
  color: var(--color-teal-400);
}

/* Ensure all text is visible on black background */
strong {
  color: var(--color-gray-200);
}

/* Accessibility */
.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;
}

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