/* Reset & base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Body */
body.item {
  min-height: 100vh;
  background: #2A53A2;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* Card login */
.item1 {
  background-color: #fff;
  border-radius: 20px;
  text-align: center;
  padding: 36px 20px; 
  width: 100%;
  max-width: 340px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2),
              0 6px 20px rgba(0,0,0,0.19);
}

/* Title */
.item1 h2 {
  font-size: 24px;
  margin-bottom: 10px;
}

/* Button */
.btn-primary {
  color: #fff;
  background-color: #2A53A2;
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 500;
  text-transform: uppercase;
  transition: all .3s;
  border: none;
  cursor: pointer;
  width: 100%;
  max-width: 260px;
}

.btn-primary:hover {
  background-color: #1f3f82;
}

/* Responsive text */
@media (max-width: 480px) {
  body.item {
    padding: 16px;
  }

  .item1 {
    max-width: 300px;     /* hẹp hơn nữa trên mobile */
    padding: 40px 18px;   /* cao lên rõ */
  }

  .item1 h2 {
    font-size: 22px;
  }

  .btn-primary {
    max-width: 220px;
  }
}