body {
	font-family: Arial, sans-serif;
	margin: 0;
}


.navbar {
	display: flex;
	justify-content: space-evenly;
	background-color: orange;
	padding: 10px 0;
}


.nav-item {
	position: relative;
	flex: 1;
	text-align: center;
	color: white;
	padding: 10px 0;
	cursor: pointer;
	transition: all 0.5s ease-in-out;
}


.nav-item:hover {
	background-color: #cc7700;
	transform: scale(1.1,1.1);
}


.dropdown {
  display: none; /* Ẩn mặc định */
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: #8a5b14;
  color: white;
  padding: 15px;
  box-shadow: 0px 4px 8px rgba(0,0,0,0.2);
  z-index: 1000;
  justify-content: space-evenly;
}


.nav-item:hover .dropdown {
  display: flex; /* Chỉ hiện khi hover */
}


.dropdown-column {
	padding: 0 15px;
	min-width: 200px;
}


.dropdown-column h4 {
	margin-top: 0;
	color: #fff;
	font-size: 16px;
	border-bottom: 1px solid #ccc;
	padding-bottom: 5px;
}


.dropdown-column a {
	display: block;
	color: #fff;
	text-decoration: none;
	padding: 5px 0;
}


.dropdown-column a:hover {
	text-decoration: underline;
}


footer {
	background-color: #f1f1f1;
	border-top: 1px solid #ccc;
	padding: 20px;
	text-align: center;
	font-size: 14px;
	color: #333;
}


.footer-container {
	max-width: 800px;
	margin: 0 auto;
	line-height: 1;
}


footer a {
	color: #0066cc;
	text-decoration: none;
}


footer a:hover {
	text-decoration: underline;
}
footer p{
	font-family: Arial, Helvetica, sans-serif;
}

.subject {
	border: 1px solid #ccc;
	border-radius: 5px;
	margin-bottom: 10px;
	padding: 10px;
}


.toggle {
	cursor: pointer;
	font-weight: bold;
	color: #003399;
	margin-bottom: 5px;
	display: flex;
	align-items: center;
	gap: 8px;
}


.toggle-icon {
	font-weight: bold;
	font-size: 18px;
	width: 20px;
	display: inline-block;
}


.hidden {
	display: none;
	margin-left: 20px;
}


.chapter {
	margin-top: 5px;
}


.lesson {
	margin-left: 20px;
}


a {
	color: #444;
	text-decoration: none;
	font-family: 'Times New Roman', Times, serif;
	transition: all 1s ease-in-out;
}


a:hover {
	text-decoration: underline;
	transform: scale(1.2,1.2);
}
.gioithieu{
	display: flexbox;
	justify-items: center;
	align-items: center;
	gap: 20px;
}
img{
	width: 200px;
	height: 200px;
}
p{
	text-align: center;
	font-family: 'Times New Roman', Times, serif;
}
span{
	font-weight: 300;
}
h3{
	font-family: 'Times New Roman', Times, serif;
}
.slick-prev,.slick-next{
	display: none !important;
}
.slick-dots{
	display: none !important;
}
.slick-slider{
	margin: 30px;
}
.slick-slide{
	text-align: center;
}
.slick-slide.slick-center{
	margin: auto;
}
.slick-slide:not(.slick-center){
	opacity: 70%;
	transform: scale(0.7,0.7);
}
.baitap{
	transform: scale(2,2);
	font-family: 'Times New Roman', Times, serif;
}
input{
	text-align: center;
	width: 100px;
	height: 20px;
	margin: 30px;
}
.dapan{
	display: flex;
	justify-content: center;
	align-items: center;
}