/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
  /* Colors - Neutrals with High-Contrast CTAs */
  --color-bg-primary: #0f0f0f;
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #252525;
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #b8b8b8;
  --color-text-tertiary: #808080;
  --color-accent-primary: #00d9ff;
  --color-accent-secondary: #0099ff;
  --color-accent-tertiary: #006699;
  --color-cta-primary: #ff3366;
  --color-cta-hover: #ff5580;
  --color-positive: #00cc88;
  --color-negative: #ff6b6b;
  --color-quote-bg: rgba(0, 217, 255, 0.05);
  --color-quote-border: var(--color-accent-primary);

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Layout */
  --container-max-width: 1000px;
  --container-padding: 2rem;

  /* Animation */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ========================================
   CSS Reset & Base Styles
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Progress Bar
   ======================================== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-cta-primary));
  z-index: 9999;
  transition: width 0.1s linear;
  box-shadow: 0 0 10px var(--color-accent-primary);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 50%, rgba(0, 217, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 51, 102, 0.1) 0%, transparent 50%);
  z-index: 0;
  will-change: transform;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--spacing-2xl) var(--container-padding);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 300;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.hero-tagline {
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-tertiary);
}

.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-accent-primary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  animation: bounce 2s infinite;
}

.scroll-indicator svg {
  animation: arrow-bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes arrow-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(5px); }
}

/* ========================================
   Fade-in Animations
   ======================================== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease forwards;
}

.fade-in-up.delay-1 {
  animation-delay: 0.2s;
}

.fade-in-up.delay-2 {
  animation-delay: 0.4s;
}

.fade-in-up.delay-3 {
  animation-delay: 0.6s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ========================================
   Reveal on Scroll
   ======================================== */
.reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Article Content
   ======================================== */
.article-content {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-primary);
}

.intro-section {
  margin-bottom: var(--spacing-3xl);
}

.lead-paragraph {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  font-weight: 300;
}

.content-section {
  margin-bottom: var(--spacing-3xl);
  transition: transform var(--transition-normal);
}

.content-section:hover {
  transform: translateX(5px);
}

.content-section h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.content-section h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-cta-primary));
  transition: width var(--transition-normal);
}

.content-section:hover h2::after {
  width: 120px;
}

.content-section h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-accent-primary);
}

.content-section p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

.content-section ul, .content-section ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.content-section li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.content-section li strong {
  color: var(--color-text-primary);
}

/* ========================================
   Expert Quote
   ======================================== */
.expert-quote {
  background: var(--color-quote-bg);
  border-left: 4px solid var(--color-quote-border);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  border-radius: 0 8px 8px 0;
  transition: all var(--transition-normal);
}

.expert-quote:hover {
  background: rgba(0, 217, 255, 0.08);
  transform: translateX(10px);
  box-shadow: 0 4px 20px rgba(0, 217, 255, 0.1);
}

.expert-quote p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-style: italic;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
  line-height: 1.6;
}

.expert-quote cite {
  display: block;
  font-style: normal;
  font-weight: 600;
  color: var(--color-accent-primary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   Capability Grid
   ======================================== */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.capability-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-bg-tertiary);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.capability-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
  border-color: var(--color-accent-primary);
}

.capability-card:hover::before {
  transform: scaleX(1);
}

.capability-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent-primary);
}

.capability-card p {
  margin-bottom: 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* ========================================
   Comparison Grid
   ======================================== */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.comparison-card {
  background: var(--color-bg-secondary);
  border-radius: 12px;
  padding: var(--spacing-lg);
  border: 2px solid transparent;
  transition: all var(--transition-normal);
}

.comparison-card.positive {
  border-color: var(--color-positive);
}

.comparison-card.negative {
  border-color: var(--color-negative);
}

.comparison-card:hover {
  transform: scale(1.02);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.comparison-card.positive:hover {
  box-shadow: 0 10px 40px rgba(0, 204, 136, 0.2);
}

.comparison-card.negative:hover {
  box-shadow: 0 10px 40px rgba(255, 107, 107, 0.2);
}

.comparison-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.comparison-card.positive h3 {
  color: var(--color-positive);
}

.comparison-card.negative h3 {
  color: var(--color-negative);
}

.comparison-card ul {
  list-style: none;
  padding-left: 0;
}

.comparison-card li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.comparison-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.comparison-card.positive li::before {
  background: var(--color-positive);
}

.comparison-card.negative li::before {
  background: var(--color-negative);
}

.comparison-card li:hover::before {
  transform: scale(1.5);
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
  position: relative;
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  overflow: hidden;
}

.cta-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 80% 50%, rgba(255, 51, 102, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 20% 20%, rgba(0, 217, 255, 0.1) 0%, transparent 50%);
  z-index: 0;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-profile {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.cta-image-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
}

.cta-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 4px solid var(--color-accent-primary);
  box-shadow: 0 0 40px rgba(0, 217, 255, 0.3);
  transition: all var(--transition-slow);
  object-fit: cover;
}

.cta-image:hover {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 0 60px rgba(0, 217, 255, 0.5);
  border-color: var(--color-cta-primary);
}

.cta-text h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-lg);
  font-weight: 600;
}

.cta-text p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background: linear-gradient(135deg, var(--color-cta-primary) 0%, var(--color-cta-hover) 100%);
  color: white;
  text-decoration: none;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: 50px;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 15px rgba(255, 51, 102, 0.4);
  margin-top: var(--spacing-md);
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.cta-button:hover::before {
  width: 300px;
  height: 300px;
}

.cta-button:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 30px rgba(255, 51, 102, 0.6);
}

.cta-button:active {
  transform: translateY(-1px) scale(1.02);
}

.cta-button span,
.cta-button svg {
  position: relative;
  z-index: 1;
}

.cta-button svg {
  transition: transform var(--transition-normal);
}

.cta-button:hover svg {
  transform: translateX(5px);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-xl) 0;
  text-align: center;
  border-top: 1px solid var(--color-bg-tertiary);
}

.footer p {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-xs);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (min-width: 768px) {
  .cta-profile {
    grid-template-columns: auto 1fr;
    text-align: left;
  }

  .cta-image-wrapper {
    justify-content: flex-start;
  }

  .cta-image {
    width: 250px;
    height: 250px;
  }
}

@media (max-width: 767px) {
  :root {
    --container-padding: 1.5rem;
    --spacing-3xl: 4rem;
  }

  .hero {
    min-height: 80vh;
  }

  .capability-grid,
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  .progress-bar,
  .scroll-indicator,
  .cta-button,
  .footer {
    display: none;
  }

  .hero-background,
  .cta-background {
    display: none;
  }

  a {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  h2, h3 {
    page-break-after: avoid;
  }

  .content-section {
    page-break-inside: avoid;
  }
}

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

  .fade-in-up {
    opacity: 1;
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

a:focus,
button:focus {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}