header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 50px;
  background: rgba(15,15,15,0.7);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #62d1f3;
  letter-spacing: 1px;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #f5f5f5;
  font-weight: bold;
  transition: all 0.3s;
}

nav a:hover, nav a.active {
  color: #62d1f3;
  text-shadow: 0 0 8px #62d1f3;
}

/* ===== MOBILE ===== */
@media(max-width: 600px) {
  header {
    flex-direction: column;
    padding: 15px 10px;
  }

  nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-top: 10px;
  }

  nav a {
    margin: 5px 0;
    font-size: 0.95rem;
  }
}