:root {
  --bg-dark: #0d1117;
  --bg-light: #f4f4f4;
  --primary: #00ffcc;
  --text-dark: #e6edf3;
  --text-light: #111;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-dark);
  transition: 0.3s ease;
}

body.light-mode {
  background: var(--bg-light);
  color: var(--text-light);
}

.navbar {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(13,17,23,0.8);
  padding: 1rem;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links a {
  margin-left: 1.5rem;
  color: var(--text-dark);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--primary);
}

.hero {
  height: 90vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,255,204,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,204,0.1) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: moveGrid 20s linear infinite;
}

@keyframes moveGrid {
  from { background-position: 0 0; }
  to { background-position: 40px 40px; }
}

.btn-primary {
  background: var(--primary);
  padding: 0.8rem 1.5rem;
  text-decoration: none;
  color: black;
}

.btn-secondary {
  border: 1px solid var(--primary);
  padding: 0.8rem 1.5rem;
  color: var(--primary);
  text-decoration: none;
}