:root {
  --bg: #07070e;
  --fg: #f0f0f5;
  --fg-muted: #9090a0;
  --accent: #d4f040;
  --accent-dim: rgba(212, 240, 64, 0.12);
  --surface: #10101c;
  --border: rgba(240, 240, 245, 0.08);
  --blue: #5b7fff;
  --ring-1: rgba(212, 240, 64, 0.25);
  --ring-2: rgba(212, 240, 64, 0.12);
  --ring-3: rgba(212, 240, 64, 0.05);
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--accent);
}
.nav-tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 100px;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 60px;
  padding: 100px 48px 80px;
  min-height: 85vh;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: -200px;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(212,240,64,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  max-width: 680px;
}
.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(212, 240, 64, 0.3);
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 28px;
  background: var(--accent-dim);
}
.hero-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.highlight {
  color: var(--accent);
}
.hero-sub {
  font-size: 18px;
  line-height: 1.65;
  color: var(--fg-muted);
  max-width: 520px;
}

/* Signal Rings Visual */
.hero-visual {
  position: relative;
  width: 300px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.signal-rings {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
}
.ring-1 {
  width: 300px; height: 300px;
  border-color: var(--ring-1);
  animation: pulse 3s ease-in-out infinite;
}
.ring-2 {
  width: 200px; height: 200px;
  border-color: var(--ring-2);
  animation: pulse 3s ease-in-out infinite 0.5s;
}
.ring-3 {
  width: 120px; height: 120px;
  border-color: var(--ring-3);
  animation: pulse 3s ease-in-out infinite 1s;
}
.center-dot {
  width: 16px; height: 16px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 30px var(--accent), 0 0 60px rgba(212,240,64,0.4);
  z-index: 1;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.6; }
}

/* Features */
.features {
  padding: 80px 48px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.features-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-title {
  font-family: 'Syne', sans-serif;
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.section-sub {
  font-size: 16px;
  color: var(--fg-muted);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.feature-card {
  padding: 40px 36px;
  background: var(--bg);
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}
.feature-card:hover {
  border-color: rgba(212,240,64,0.3);
}
.feature-icon {
  width: 44px; height: 44px;
  background: var(--accent-dim);
  border: 1px solid rgba(212,240,64,0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--accent);
}
.feature-title {
  font-family: 'Syne', sans-serif;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.feature-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg-muted);
}

/* How */
.how {
  padding: 100px 48px;
  background: var(--bg);
}
.how-inner {
  max-width: 800px;
  margin: 0 auto;
}
.how-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 64px;
}
.how-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  align-items: start;
  padding: 36px 0;
  border-bottom: 1px solid var(--border);
}
.step:first-child { border-top: 1px solid var(--border); }
.step-num {
  font-family: 'Syne', sans-serif;
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  opacity: 0.4;
  line-height: 1;
  padding-top: 4px;
}
.step p {
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg-muted);
}

/* Closing */
.closing {
  padding: 100px 48px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.closing-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.closing-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 24px;
}
.closing-body {
  font-size: 17px;
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: 540px;
  margin: 0 auto;
}

/* Footer */
.footer {
  padding: 28px 48px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 12px;
  color: var(--fg-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 60px 24px 60px;
  }
  .hero-visual { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .nav { padding: 16px 24px; }
  .features, .how, .closing { padding: 60px 24px; }
  .step { grid-template-columns: 48px 1fr; }
}
@media (max-width: 600px) {
  .nav-tag { display: none; }
  .hero-headline { font-size: 36px; }
  .section-title { font-size: 28px; }
  .how-title { font-size: 28px; }
  .closing-headline { font-size: 28px; }
}