/* PageNodes Website - Modern Dark Theme */
:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --bg-card: #1a1a3a;
  --bg-card-hover: #222250;
  --text-primary: #ffffff;
  --text-secondary: #a0a0c0;
  --text-muted: #606080;
  --accent-cyan: #00ffff;
  --accent-green: #00ff88;
  --accent-purple: #aa66ff;
  --accent-pink: #ff66aa;
  --accent-yellow: #ffcc00;
  --gradient-main: linear-gradient(135deg, #00ffff 0%, #00ff88 50%, #aa66ff 100%);
  --gradient-button: linear-gradient(135deg, #00ff88 0%, #00ffff 100%);
  --shadow-glow: 0 0 40px rgba(0, 255, 255, 0.3);
  --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.5);
  --border-subtle: 1px solid rgba(255, 255, 255, 0.1);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  min-height: 100vh;
}

/* Background Grid Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(0, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 26, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: var(--border-subtle);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

nav a:hover {
  color: var(--accent-cyan);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

nav a.external::after {
  display: none;
}

/* Main Content */
main {
  padding-top: 80px;
  min-height: 100vh;
}

/* Hero Section */
.hero {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 255, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: clamp(1.2rem, 3vw, 1.75rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-button);
  color: var(--bg-primary);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 60px rgba(0, 255, 136, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-large {
  padding: 1.25rem 3rem;
  font-size: 1.25rem;
}

/* Hero Image */
.hero-image {
  margin-top: 3rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  border: var(--border-subtle);
  max-width: 100%;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* Sections */
section {
  padding: 6rem 0;
}

section h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  text-align: center;
  margin-bottom: 1rem;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

section .section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 4rem auto;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  border: var(--border-subtle);
  transition: all 0.3s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.feature-icon.ai { background: linear-gradient(135deg, rgba(170, 102, 255, 0.2), rgba(255, 102, 170, 0.2)); }
.feature-icon.hardware { background: linear-gradient(135deg, rgba(0, 255, 136, 0.2), rgba(0, 255, 255, 0.2)); }
.feature-icon.network { background: linear-gradient(135deg, rgba(0, 255, 255, 0.2), rgba(102, 170, 255, 0.2)); }
.feature-icon.visual { background: linear-gradient(135deg, rgba(255, 204, 0, 0.2), rgba(255, 102, 170, 0.2)); }
.feature-icon.privacy { background: linear-gradient(135deg, rgba(0, 255, 136, 0.2), rgba(170, 102, 255, 0.2)); }
.feature-icon.realtime { background: linear-gradient(135deg, rgba(255, 102, 170, 0.2), rgba(255, 204, 0, 0.2)); }

.feature-card h3 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Stats Section */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  text-align: center;
  padding: 4rem 0;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin: 4rem 0;
}

.stat-item h3 {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 0.5rem;
}

/* Use Cases */
.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.use-case {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: var(--border-subtle);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.use-case-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.use-case h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.use-case p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 6rem 2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin: 4rem 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(0, 255, 255, 0.1) 0%, transparent 60%);
  pointer-events: none;
}

.cta-section h2 {
  margin-bottom: 1rem;
}

.cta-section p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

/* Footer */
footer {
  background: var(--bg-secondary);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
  border-top: var(--border-subtle);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-brand p {
  color: var(--text-secondary);
}

.footer-links h4 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: var(--border-subtle);
  color: var(--text-muted);
}

/* Page Content */
.page-content {
  padding: 4rem 0;
}

.page-content h1 {
  font-size: 3rem;
  margin-bottom: 2rem;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-content h2 {
  font-size: 2rem;
  margin: 3rem 0 1rem;
  text-align: left;
  background: none;
  -webkit-text-fill-color: var(--text-primary);
  color: var(--text-primary);
}

.page-content h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--accent-cyan);
}

.page-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  line-height: 1.8;
}

.page-content ul, .page-content ol {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.page-content li {
  margin-bottom: 0.75rem;
  line-height: 1.7;
}

.page-content a {
  color: var(--accent-cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.page-content a:hover {
  border-bottom-color: var(--accent-cyan);
}

.page-content code {
  background: var(--bg-card);
  padding: 0.2em 0.5em;
  border-radius: var(--radius-sm);
  font-family: 'Fira Code', 'Monaco', monospace;
  font-size: 0.9em;
  color: var(--accent-green);
}

.page-content pre {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: var(--border-subtle);
}

.page-content pre code {
  background: none;
  padding: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Highlight Box */
.highlight-box {
  background: var(--bg-card);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin: 2rem 0;
}

.highlight-box p {
  margin-bottom: 0;
}

/* Node Categories */
.node-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.node-category {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: var(--border-subtle);
}

.node-category h4 {
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.node-category ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.node-category li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding: 0.25rem 0;
}

/* Responsive */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    gap: 1rem;
  }

  nav {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    min-height: auto;
    padding: 3rem 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-large {
    width: 100%;
    justify-content: center;
  }

  section {
    padding: 4rem 0;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

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

/* Animations */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* Smooth Reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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