body {
  background-color: #f4f9fb;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Dark mode override */
body.dark-mode {
  background-color: #121212;
}



/* Header and Nav Bar */
.main-header {
  width: 100%;
  padding: 1rem 0;
  background-color: #d4f5fa;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: auto;
}

.nav-center {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  flex: 1;
}

.nav-center a {
  text-decoration: none;
  color: #222;
  font-weight: 600;
  font-size: 1.05rem;
  position: relative;
  transition: color 0.3s ease;
}

.nav-center a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0%;
  height: 2px;
  background-color: #0095c8;
  transition: width 0.3s ease;
}

.nav-center a:hover {
  color: #0095c8;
}

.nav-center a:hover::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-right button {
  background: none;
  border: none;
  font-size: 1.1rem;
  color: #333;
  cursor: pointer;
  transition: color 0.3s ease;
}

.nav-right button:hover {
  color: #0095c8;
}

/* Dark Mode */
.dark-mode {
  background-color: #1e1e1e;
  color: #f5f5f5;
}

.dark-mode .main-header {
  background-color: #1e1e1e;
}

.dark-mode .nav-center a,
.dark-mode .nav-right button,
.dark-mode .social-icons a {
  color: #f5f5f5;
}

.dark-mode .nav-center a:hover::after {
  background-color: #f5f5f5;
}

.dark-mode .btn-outline {
  color: #f5f5f5;
  border-color: #f5f5f5;
}

.dark-mode .btn-outline:hover {
  background-color: #f5f5f5;
  color: #121212;
}

.dark-mode .btn-primary {
  background-color: #007aad;
}

/* Responsive */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .nav-center {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    padding-top: 0.5rem;
  }

  .nav-right {
    align-self: flex-end;
  }
}