* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #020617;
  color: white;
}

/* PARTICLES */
#particles-js {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: -1;
}

/* NAVBAR */
.navbar {
  display: flex;
  justify-content: space-between;
  padding: 20px 40px;
  align-items: center;
  background: rgba(2,6,23,0.7);
  backdrop-filter: blur(10px);
}

.logo {
  color: #38bdf8;
  font-weight: bold;
}

.nav-links {
  display: flex;
  gap: 25px;
  align-items: center;
}

.nav-links a {
  color: #cbd5f5;
  text-decoration: none;
}

.login-btn {
  background: linear-gradient(135deg,#38bdf8,#22c55e);
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
}

/* HERO */
.hero {
  height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

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

.hero p {
  margin: 20px 0;
  color: #cbd5f5;
}

.hero-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
}

.cta {
  background: #22c55e;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
}

.secondary {
  border: 1px solid #38bdf8;
  padding: 12px 24px;
  border-radius: 8px;
  color: #38bdf8;
  background: transparent;
}

/* COURSES */
.course-grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.course-card {
  background: #1e293b;
  padding: 20px;
  border-radius: 12px;
  max-width: 300px;
  transition: 0.3s;
}

.course-card:hover {
  transform: translateY(-10px);
}

/* SECTIONS */
section {
  padding: 80px 20px;
  text-align: center;
}

/* MOBILE */
.hamburger {
  display: none;
  font-size: 28px;
}

@media (max-width: 768px) {
  .hamburger {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    right: 0;
    flex-direction: column;
    background: #020617;
    padding: 20px;
    display: none;
  }

  .nav-links.active {
    display: flex;
  }

  .hero h1 {
    font-size: 28px;
  }
}