body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #f1f5f9;
}

.navbar {
  position: sticky;
  top: 0;
  background: #1e293b;
  display: flex;
  justify-content: space-between;
  padding: 1rem 2rem;
}

.navbar a { color: #cbd5e1; margin-left: 1rem; text-decoration: none; }
.navbar a:hover { color: #fff; }

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4rem 2rem;
}

.hero-text { max-width: 50%; }
.hero-text h1 { font-size: 2.5rem; }
.highlight { color: #34d399; }
.btn, .btn-outline {
  display: inline-block; margin: 0.5rem 0.5rem 0 0;
  padding: 0.7rem 1.5rem; border-radius: 20px;
  font-weight: bold;
}
.btn { background: #34d399; color: #0f172a; }
.btn-outline { border: 1px solid #34d399; color: #34d399; }
.dev { font-size: 0.8rem; color: #94a3b8; margin-top: 1rem; }

.phone {
  background: #000; color: #fff; padding: 1rem;
  border-radius: 20px; width: 200px; height: 350px;
  overflow: auto;
}

.section { padding: 3rem 2rem; }
.section h2 { font-size: 2rem; margin-bottom: 1rem; }

.grid { display: grid; gap: 1rem; }
.grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.card {
  background: #1e293b; padding: 1rem; border-radius: 15px;
  border: 1px solid #334155;
}

.video-placeholder {
  background: #1e293b; height: 300px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 15px; color: #64748b;
}

form { display: flex; flex-direction: column; gap: 1rem; max-width: 400px; }
input, textarea {
  padding: 0.8rem; border-radius: 10px;
  border: 1px solid #334155; background: #0f172a; color: #fff;
}
button { cursor: pointer; }

footer {
  text-align: center; padding: 1rem;
  background: #1e293b; font-size: 0.8rem; color: #94a3b8;
}
/* Demo video box */
.video-box {
  width: 80%;              /* same width as placeholder */
  max-width: 800px;        /* keep it neat on big screens */
  margin: 0 auto;          /* center horizontally */
  aspect-ratio: 16 / 9;    /* keeps proper video ratio */
  background: #000;        /* black background like video */
  border-radius: 12px;     
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  overflow: hidden;
}

.video-box iframe {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 12px;
}
#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1; /* keep it behind content */
  background: #0f2027; /* dark gradient backdrop */
}