body {
  font-family: 'Poppins', sans-serif;
  margin: 0;
  padding: 20px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;

  /* Center Everything */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
}

h1 {
  font-size: 32px;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

.container {
  margin-top: 20px;
}

#subjects div,
#semesters div {
  margin: 15px 0;
  padding: 20px;
  background: rgba(255, 255, 255, 0.15);
  width: 320px;
  border-radius: 15px;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

input, select {
  padding: 8px;
  margin: 8px;
  border-radius: 8px;
  border: none;
  outline: none;
  text-align: center;
}

button {
  padding: 10px 25px;
  margin: 10px;
  border-radius: 25px;
  border: none;
  background: linear-gradient(45deg, #7ce405, #ff5e62);
  color: white;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s ease;
}

button:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 20px rgba(0,0,0,0.5);
}

a button {
  background: linear-gradient(45deg, #13dae8, #5b86e5);
}

h2 {
  margin-top: 20px;
  font-size: 24px;
  color: #ffd700;
}

/* Footer */
footer {
  margin-top: 40px;
  padding: 15px;
  font-size: 14px;
  background: rgba(0,0,0,0.25);
  border-radius: 10px;
  width: 100%;
  max-width: 400px;
}

footer strong {
  color: #12b9cf;
}

/* Mobile Responsive */
@media (max-width: 600px) {
  body {
    padding: 15px;
  }

  #subjects div,
  #semesters div {
    width: 95%;
  }

  button {
    width: 90%;
  }
}