<style>
body {
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif; /* modern, clean font */
  line-height: 1.7;
  margin: 0;
  padding: 0;
  background: #f8f9fc;
  color: #333;
}

/* === Header === */
header {
  background: linear-gradient(135deg, #007bff, #0056b3);
  color: #fff;
  padding: 50px 20px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

header h1 {
  margin: 0;
  font-size: 2.2em;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* === Navigation === */
nav {
  display: flex;
  justify-content: center;
  background: #ffffffdd;
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
  position: relative;
  z-index: 10;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 35px;
  padding: 15px 0;
  margin: 0;
}

nav li {
  position: relative;
}

nav a {
  text-decoration: none;
  color: #333;
  font-weight: 600;
  font-size: 1em;
  padding: 8px 12px;
  display: block;
  transition: all 0.3s ease;
}

nav a:hover {
  color: #0072ff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: #ffffffee;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  min-width: 220px;
  display: none;
  z-index: 20;
  padding: 12px 0;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.dropdown:hover > .dropdown-menu,
.dropdown-menu:hover {
  display: block;
  opacity: 1;
  visibility: visible;
}

.dropdown-menu li a {
  color: #333;
  padding: 10px 20px;
  display: block;
  text-decoration: none;
  transition: all 0.3s ease;
  font-size: 0.95em;
}

.dropdown-menu li a:hover {
  background: #f0f7ff;
  color: #0072ff;
  border-radius: 8px;
}

/* === Main Content === */
main {
  max-width: 900px;
  margin: 40px auto;
  padding: 25px 35px;
  background: #fff;
  border-radius: 15px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

h2 {
  color: #0056b3;
  margin-top: 35px;
  margin-bottom: 15px;
  border-left: 5px solid #007bff;
  padding-left: 12px;
  font-size: 1.6em;
  font-weight: 700;
  letter-spacing: 0.5px;
}

h3 {
  color: #007bff;
  margin-top: 20px;
  font-size: 1.2em;
  font-weight: 600;
}

p {
  margin-bottom: 18px;
  text-align: justify;
  font-size: 1em;
  color: #444;
}

ul {
  list-style-type: square;
  padding-left: 30px;
  margin-bottom: 20px;
}

li {
  margin-bottom: 10px;
  font-size: 1em;
  line-height: 1.6;
}

/* Footer */
footer {
  text-align: center;
  background: #f0f4fa;
  padding: 25px;
  font-size: 0.95em;
  color: #555;
  margin-top: 40px;
  border-top: 1px solid #e0e0e0;
}

/* Certification link style */
.cert-link {
  display: inline-block;
  text-decoration: none;
  color: #007bff;
  font-weight: 600;
  transition: all 0.3s ease;
  padding: 5px 10px;
  border-radius: 6px;
}

.cert-link:hover {
  color: #fff;
  background-color: #007bff;
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    gap: 15px;
  }

  main {
    padding: 20px 25px;
    margin: 20px;
  }

  header h1 {
    font-size: 1.8em;
  }

  h2 {
    font-size: 1.4em;
  }

  h3 {
    font-size: 1.1em;
  }
}
</style>
