:root {
  --bg: #0b0f0c;
  --text: #e6f1f2;
  --accent: #00ff5a;
  --muted: #8fbf82;
  --danger: #ff4040;
}

body {
  margin: 0;
  font-family: "Arial", sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* Layout */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(17, 17, 17, 0.9);
  backdrop-filter: saturate(160%) blur(6px);
  padding: 1rem 0;
  border-bottom: 1px solid #222;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.section, .hero {
  scroll-margin-top: 96px;
}
html {scroll-behavior: smooth; }
.brand-logo {
  height: 65px;
  width: auto;
  display: block;
}
.menu a {
  margin: 0 1rem;
  color: var(--text);
  text-decoration: none;
  font-weight: bold;
}
.menu a:hover {
  color: var(--accent);
}

/* Hero */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4rem 0;
}
.hero .device {
  flex: 1;
  text-align: center;
}
.hero .nsd-mockup {
  max-width: 280px;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0, 255, 90, 0.2);
}

/* Buttons */
.btn {
  display: inline-block;
  margin: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.3s ease;
}
.btn:hover {
  background: var(--accent);
  color: #000;
}
.btn.primary {
  background: var(--accent);
  color: #000;
  font-weight: bold;
}

/* Sections */
.section {
  padding: 4rem 0;
}
h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}
p.lead {
  font-size: 1.2rem;
  color: var(--muted);
}
.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.card {
  background: #111;
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid #222;
}
.card h3 {
  margin-top: 0;
  color: var(--accent);
}

/* Footer */
.footer {
  background: #111;
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid #222;
  color: var(--muted);
}