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

body {
  font-family: "Segoe UI", sans-serif;
  background: #020617;
  color: #fff;
}

/* NAVBAR */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 60px;
  background: #020617;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 22px;
  font-weight: bold;
}

.navbar a {
  color: #cbd5f5;
  margin-left: 25px;
  text-decoration: none;
}

.navbar .btn {
  background: #2563eb;
  padding: 8px 16px;
  border-radius: 6px;
}

/* HERO */
.hero {
  position: relative;
  height: 90vh;
  overflow: hidden;
}

/* STAR BACKGROUND */
#particles-js {
  position: absolute;
  inset: 0;
  background: #020617;
  z-index: 1;
}

/* HERO CONTENT */
.hero-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.hero-content h1 {
  font-size: 48px;
}

.hero-content p {
  margin: 20px 0;
  font-size: 18px;
}

.btn-primary {
  background: #38bdf8;
  color: #000;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
}

/* SECTIONS */
.section {
  padding: 80px 60px;
  text-align: center;
  background: #fff;
  color: #000;
}

.section.gray {
  background: #f1f5f9;
}

.cards {
  display: flex;
  gap: 30px;
  margin-top: 40px;
}

.card {
  flex: 1;
  padding: 40px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* FOOTER */
footer {
  background: #020617;
  padding: 20px;
  text-align: center;
}

/* MOBILE */
@media (max-width: 768px) {
  .cards {
    flex-direction: column;
  }

  .hero-content h1 {
    font-size: 32px;
  }
}