:root {
  --bg: #05070d;
  --bg-1: #080c16;
  --bg-2: #0b1220;
  --panel: #0d1420;
  --panel-border: rgba(58,160,255,0.22);
  --ink: #eef6ff;
  --muted: #93a3ae;
  --muted-2: #5c6c78;
  --accent: #3aa0ff;
  --accent-2: #eaf6ff;
  --accent-ink: #052240;
  --max-width: 1120px;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

/* Scroll progress bar */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 100;
  pointer-events: none;
}

/* Scroll-reveal system */
.reveal,
.reveal-left,
.reveal-scale {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: var(--d, 0s);
}
.reveal { transform: translateY(28px); }
.reveal-left { transform: translateX(-28px); }
.reveal-scale { transform: scale(0.94); }

.reveal.in-view,
.reveal-left.in-view,
.reveal-scale.in-view {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-left, .reveal-scale {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn-primary.pulse {
    animation: none !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    linear-gradient(rgba(58,160,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(58,160,255,0.035) 1px, transparent 1px),
    var(--bg);
  background-size: 48px 48px, 48px 48px, auto;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5em; font-weight: 700; color: var(--ink); }
p { margin: 0 0 1em; color: var(--muted); }
a { color: inherit; text-decoration: none; }

.accent { color: var(--accent); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--accent-2);
  margin: 0 0 0.9em;
}
.section .eyebrow, .hero .eyebrow { text-align: center; }

/* HUD corner-bracket frame */
.hud-frame {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--panel-border);
}
.hud-frame::before {
  content: '';
  position: absolute;
  inset: -1px;
  pointer-events: none;
  opacity: 0.65;
  background:
    linear-gradient(var(--accent), var(--accent)) top left / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top left / 2px 14px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 2px 14px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 2px 14px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 2px 14px no-repeat;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5,7,13,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(58,160,255,0.14);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}
.nav.scrolled {
  background: rgba(5,7,13,0.96);
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-icon { width: 26px; height: 26px; flex-shrink: 0; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.nav-links a:not(.btn) {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
}
.nav-links a:not(.btn):hover { color: var(--accent-2); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.15s ease, opacity 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 0 0 0 rgba(58,160,255,0.5);
}
.btn-primary:hover { opacity: 0.92; }
.btn-primary.pulse {
  animation: pulseGlow 2.6s ease-in-out infinite;
}
.btn-primary.pulse:hover { animation-play-state: paused; }
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(58,160,255,0.45); }
  50% { box-shadow: 0 0 0 14px rgba(58,160,255,0); }
}
.btn-ghost {
  color: var(--ink);
  border: 1px solid rgba(58,160,255,0.35);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-small { padding: 0.5rem 1.1rem; font-size: 0.9rem; }
.btn-large { padding: 1rem 2rem; font-size: 1.05rem; }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 7rem 1.25rem 5.5rem;
}
#network-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.7;
}
.hero-inner { position: relative; z-index: 1; max-width: 760px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: #fff;
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-ticker {
  margin: 2rem 0 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted-2);
}

/* Sections */
.section { padding: 5rem 1.25rem; position: relative; }
.section-inner { max-width: var(--max-width); margin: 0 auto; }
.section h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  text-align: center;
}
.section-lead {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
}

/* Problem cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.5rem;
}
.card {
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 32px rgba(0,0,0,0.35);
  border-color: rgba(58,160,255,0.5);
}
.card-icon {
  width: 34px;
  height: 34px;
  color: var(--accent);
  margin-bottom: 0.9rem;
}
.card-icon svg { width: 100%; height: 100%; }
.card h3 { font-size: 1.05rem; }
.card p { margin: 0; font-size: 0.94rem; }

/* Demo panel */
.demo-panel {
  max-width: 640px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
}
.demo-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid rgba(58,160,255,0.16);
  background: rgba(58,160,255,0.04);
}
.demo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px 1px var(--accent);
  animation: dotPulse 1.8s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.demo-title {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-2);
}
.demo-body {
  padding: 1.5rem 1.25rem 1.75rem;
  min-height: 140px;
}
.demo-msg {
  font-size: 0.96rem;
  line-height: 1.6;
  border-radius: 10px;
  padding: 0.8rem 1rem;
  max-width: 85%;
  margin-bottom: 1rem;
}
.demo-msg-user {
  background: rgba(255,255,255,0.06);
  color: var(--ink);
  margin-left: auto;
  border: 1px solid rgba(255,255,255,0.08);
}
.demo-msg-ai {
  background: rgba(58,160,255,0.08);
  color: var(--ink);
  border: 1px solid rgba(58,160,255,0.2);
  min-height: 1.6em;
}
.demo-msg-ai:empty { display: none; }
.demo-typing {
  display: inline-flex;
  gap: 4px;
  padding: 0.8rem 1rem;
  background: rgba(58,160,255,0.08);
  border: 1px solid rgba(58,160,255,0.2);
  border-radius: 10px;
  margin-bottom: 1rem;
}
.demo-typing[hidden] { display: none; }
.demo-typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: typingBounce 1.2s ease-in-out infinite;
}
.demo-typing span:nth-child(2) { animation-delay: 0.15s; }
.demo-typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-4px); opacity: 1; }
}
.demo-cursor::after {
  content: '';
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: -2px;
  animation: cursorBlink 0.9s steps(1) infinite;
}
@keyframes cursorBlink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* How it works */
.steps {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 2.5rem;
}
.steps::before {
  content: '';
  position: absolute;
  left: 0.9rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: linear-gradient(var(--accent), transparent);
  opacity: 0.4;
}
.step {
  position: relative;
  padding-bottom: 2.25rem;
}
.step:last-child { padding-bottom: 0; }
.step-num {
  position: absolute;
  left: -2.5rem;
  top: 0;
  width: 1.8rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-align: right;
}
.step-body h3 { margin-bottom: 0.35em; font-size: 1.1rem; }
.step-body p { margin: 0; }

/* Local */
.local { text-align: center; }
.local-inner { max-width: 680px; margin: 0 auto; }
.local .eyebrow { text-align: center; }
.local p { color: var(--muted); font-size: 1.05rem; margin: 0; }

/* CTA */
.cta-inner { display: flex; justify-content: center; }
.cta-panel {
  border-radius: 14px;
  padding: 3rem 2.5rem;
  text-align: center;
  max-width: 640px;
}
.cta-panel .section-lead { margin-bottom: 2rem; }

/* Footer */
.footer { padding: 3rem 1.25rem; text-align: center; border-top: 1px solid rgba(58,160,255,0.1); }
.footer-inner p { color: var(--muted-2); margin: 0.25em 0; }
.footer-brand { color: #fff; font-weight: 800; margin-bottom: 0.75rem; display: flex; align-items: center; justify-content: center; gap: 0.5rem; }
.footer a:hover { color: var(--accent-2); }
.footer-copy { margin-top: 1rem; font-size: 0.8rem; font-family: var(--mono); }

/* Responsive */
@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(5,7,13,0.98);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-links.open { max-height: 320px; padding: 0.5rem 0 1rem; }
  .nav-links a:not(.btn) { padding: 0.75rem 1.25rem; width: 100%; }
  .nav-links .btn { margin: 0.5rem 1.25rem; }
  .hero { padding: 4.5rem 1.25rem 3.5rem; }
  .section { padding: 3.5rem 1.25rem; }
  .cta-panel { padding: 2.25rem 1.5rem; }
}