/* ========== BODY & LAYOUT ========== */
body {
  font-family: 'Poppins', 'Arial', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  padding: 20px;
  color: #111;
  margin: 0;
  overflow-x: hidden;

  /* Gradient loang toàn giao diện */
  background: linear-gradient(135deg, #4c65f6 0%, #d154d1 100%);
}