html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}
html, body {
    height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.container {
flex: 1; /* 讓主內容區域自動填滿剩餘空間 */
}
footer {
    position: relative !important;
}