:root {
  /* Utilitarian Dark Mode Palette */
  --bg-primary: #121212;
  --bg-secondary: #0a0a0a;
  --text-primary: #e6e6e6;
  --text-secondary: #a3a3a3;
  --border-color: #2a2a2a;
  --accent-color: #ffffff;
  
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --spacing-base: 1.5rem;
  
  /* Animation variables */
  --transition-speed: 0.8s;
  --transition-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

html {
  overflow-x: hidden;
  background-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  overflow-x: hidden;
  background-color: transparent;
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-overflow-scrolling: touch;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--spacing-base);
}

/* Typography Hierarchy */
h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

h2 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--accent-color);
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 3.5rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 4rem; 
  text-align: center;
}

p {
  color: var(--text-secondary);
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

p:last-child {
  margin-bottom: 0;
}

/* Nav */
.navbar {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-base);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img {
  display: none;
}

.logo-svg {
  height: 28px;
  width: auto;
}

.logo-text {
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--accent-color);
}

/* Hero */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0;
  text-align: left;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
}

.hero-text {
  flex: 1;
  max-width: 600px;
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.logo-title {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero-logo-img {
  display: none;
}

.hero-logo-svg {
  height: 5rem;
  width: auto;
}

.hero-subtitle {
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.description {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 500px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 2rem;
  padding: 0.9rem 1.6rem;
  background-color: var(--accent-color);
  color: var(--bg-primary);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  border: 1px solid var(--accent-color);
  border-radius: 8px;
  transition: transform 0.2s var(--transition-ease),
              background-color 0.2s ease,
              box-shadow 0.2s ease;
}

.hero-cta:hover,
.hero-cta:focus-visible {
  transform: translateY(-2px);
  background-color: var(--text-primary);
  box-shadow: 0 10px 30px -10px rgba(255, 255, 255, 0.35);
  outline: none;
}

.hero-cta:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 3px;
}

.hero-cta-arrow {
  transition: transform 0.2s var(--transition-ease);
}

.hero-cta:hover .hero-cta-arrow,
.hero-cta:focus-visible .hero-cta-arrow {
  transform: translateX(3px);
}

.hero-divider {
  margin-top: 3rem;
  height: 1px;
  background-color: var(--border-color);
  width: 100%;
}

/* Content Grid Sections */
.ecosystem-section {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 0;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4rem;
}

.content-grid.top-grid {
  padding: 2rem 0;
}

.content-grid.bottom-grid {
  padding: 8rem 0;
}

.info-block {
  padding: 2rem;
  position: relative;
  border-radius: 12px;
  border: 1px solid transparent;
  background-color: transparent;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), 
              background-color 0.3s ease, 
              border-color 0.3s ease,
              box-shadow 0.3s ease;
}

.info-block:hover {
  transform: translateY(-4px);
  background-color: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
}

/* Terminal Window Mockup */
.terminal-window {
  width: 100%;
  max-width: 550px;
  background: rgba(10, 10, 10, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.8), inset 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter: blur(20px);
  overflow: hidden;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.terminal-header {
  padding: 16px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Timeline */
.architecture-timeline {
  padding: 8rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.timeline-container {
  display: flex;
  flex-direction: column;
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 4rem auto;
  padding-left: 40px;
}

.timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 40px;
  width: 2px;
  background: var(--border-color);
  z-index: 1;
}

.timeline-event {
  display: flex;
  align-items: flex-start;
  width: 100%;
  position: relative;
  margin-bottom: 3rem;
  padding-left: 40px;
}

.timeline-dot {
  position: absolute;
  left: -7px;
  top: 1.2rem;
  width: 16px;
  height: 16px;
  background-color: var(--bg-primary);
  border: 2px solid var(--text-secondary);
  border-radius: 50%;
  z-index: 2;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.timeline-event.active .timeline-dot {
  background-color: #ffffff;
  border-color: #ffffff;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.6), 0 0 40px rgba(255, 255, 255, 0.2);
  transform: scale(1.3);
}

.timeline-content {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.timeline-content.alt-side {
  text-align: left;
}

.feature-card {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card > p {
  overflow: hidden;
  padding: 0;
  margin: 0;
}

.timeline-event.active .feature-card {
  grid-template-rows: 1fr;
  opacity: 1;
}

.timeline-event.active .feature-card > p {
  padding: 1.5rem 2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  backdrop-filter: blur(10px);
}

.flow-node {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  border-radius: 6px;
  font-family: 'Space Mono', monospace;
  font-size: 1.1rem;
  font-weight: bold;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  display: inline-block;
  backdrop-filter: blur(5px);
  transition: border-color 0.4s, box-shadow 0.4s;
}

.timeline-event.active .flow-node {
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 15px rgba(255,255,255,0.05);
}

.node-sub {
  font-family: var(--font-family);
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: normal;
  display: block;
  margin-top: 0.2rem;
}

/* Bento grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: auto auto;
  gap: 1.5rem;
  max-width: 1000px;
  margin: 6rem auto 8rem auto;
  padding: 0 2rem;
}

.bento-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-speed) var(--transition-ease), border-color var(--transition-speed);
}

.bento-item:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.2);
}

.bento-item h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  font-weight: 500;
  letter-spacing: -0.5px;
}

.bento-item p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
}

.bento-item.wide {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(25, 25, 25, 0.8) 100%);
}

.bento-item.tall {
  grid-row: span 2;
  justify-content: flex-start;
}

.bento-visual {
  height: 120px;
  margin: 1rem 0;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 8px;
  border: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.shield-icon {
  width: 40px;
  height: 40px;
  border: 4px solid var(--text-secondary);
  border-radius: 4px 4px 20px 20px;
  opacity: 0.6;
}

.bento-item.dark-box {
  background: #000000;
  border-color: #333;
}

.terminal-header .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.terminal-title {
  margin-left: 1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.terminal-body {
  padding: 20px;
  font-size: 0.9rem;
  color: #e6e6e6;
  min-height: 200px;
  line-height: 1.5;
}

.cursor {
  display: inline-block;
  width: 8px;
  animation: blink 1s step-end infinite;
}

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

/* Architecture Flow Diagram */
.architecture-flow {
  padding: 4rem 0;
  text-align: center;
}

.flow-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  margin-top: 3rem;
}

.flow-node {
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 200px;
  backdrop-filter: blur(5px);
  transition: all 0.3s ease;
}

.flow-node:hover {
  transform: scale(1.05);
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.05);
}

.flow-node.highlight {
  border-color: #4a90e2;
  box-shadow: 0 0 20px rgba(74, 144, 226, 0.2);
}

.flow-node .node-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 0.25rem;
}

.flow-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.flow-connector .line {
  width: 2px;
  height: 30px;
  background: rgba(255, 255, 255, 0.2);
}

.flow-connector .arrow {
  width: 0; 
  height: 0; 
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid rgba(255, 255, 255, 0.2);
}

/* Solid black base for starfield (Safari + all browsers); stars draw on top */
#bg-base {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  background-color: #000000;
  pointer-events: none;
}

/* Network Canvas Background */
#network-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

.scroll-trigger {
  --scroll: 0;
  opacity: calc(var(--scroll) * 1.5);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out, filter 0.2s ease-out;
  transform: translateY(calc((1 - var(--scroll)) * 80px));
}

/* Direction Variants */
.scroll-trigger[data-direction="bottom"] {
  transform: translateY(calc((1 - var(--scroll)) * 80px));
}

.scroll-trigger[data-direction="left"] {
  transform: translateX(calc((var(--scroll) - 1) * 80px));
}

.scroll-trigger[data-direction="right"] {
  transform: translateX(calc((1 - var(--scroll)) * 80px));
}

.scroll-trigger[data-direction="zoom"] {
  transform: scale(calc(1 + (1 - var(--scroll)) * 0.1)) translateY(calc((1 - var(--scroll)) * 40px));
  filter: blur(calc((1 - var(--scroll)) * 10px));
}

@media (prefers-reduced-motion: reduce) {
  .scroll-trigger {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Footer */
.footer {
  margin-top: 8rem;
  padding: 4rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: #666;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  h2 {
    font-size: 1.8rem;
  }

  p {
    font-size: 1.05rem;
  }

  .container {
    padding: 0 1rem;
  }

  .nav-container {
    padding: 0.875rem 1rem;
  }

  .hero {
    min-height: 100svh;
    padding: 4rem 0 2rem;
  }

  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }

  .hero-text {
    align-items: center;
    display: flex;
    flex-direction: column;
    max-width: 100%;
  }

  .hero-visual {
    justify-content: center;
    width: 100%;
  }

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

  .hero-logo-svg {
    height: 3.5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .description {
    max-width: 100%;
    text-align: center;
    font-size: 1rem;
  }

  .terminal-window {
    max-width: 100%;
  }

  .section-title {
    font-size: 2rem;
    margin-bottom: 2.5rem;
  }

  .architecture-timeline {
    padding: 4rem 1rem;
  }

  .timeline-container {
    margin: 2rem auto;
    padding-left: 30px;
  }

  .timeline-line {
    left: 30px;
  }

  .timeline-event {
    padding-left: 30px;
    margin-bottom: 2rem;
  }

  .bento-grid {
    grid-template-columns: 1fr;
    margin: 3rem auto 4rem;
    padding: 0 1rem;
    gap: 1rem;
  }

  .bento-item.wide {
    grid-column: span 1;
  }

  .bento-item.tall {
    grid-row: span 1;
  }

  .bento-item {
    padding: 1.75rem;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .info-block {
    padding: 1.5rem;
  }

  .footer {
    margin-top: 4rem;
    padding: 2.5rem 0;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: clamp(2.5rem, 10vw, 3.5rem);
  }

  h2 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .bento-item {
    padding: 1.25rem;
  }

  .terminal-body {
    font-size: 0.78rem;
    padding: 14px;
    min-height: 160px;
  }

  .flow-node {
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
  }

  .hero-cta {
    font-size: 0.95rem;
    padding: 0.8rem 1.35rem;
    margin-top: 1.5rem;
  }
}