/* Reset cơ bản */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}


body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}
.container1 {
    width: 100%;
    margin: auto;
}

.hang1 {
  background-color: #005baa;
  padding: 10px 0;
  color: #fff;
}

.hang1 .logo {
  height: 50px;
}

.main-nav ul {
  list-style: none;
  display: flex;
  justify-content: flex-end;
}

.main-nav li {
  margin-left: 20px;
}

.main-nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

.hang2 {
  background: #e1efff;
  padding: 60px 0;
  text-align: center;
}

.hang2 h1 {
  font-size: 2.5em;
  margin-bottom: 10px;
}

.hang2 p {
  font-size: 1em;
  margin-bottom: 5px;
}

.hang3 {
  padding: 40px 0;
  background: #f9f9f9;
}

.hang3 h2 {
  text-align: center;
  margin-bottom: 20px;
}

.hang3-list {
  list-style: disc inside;
}

.hang3-list li {
  margin-bottom: 10px;
}

.programs {
  padding: 40px 0;
}

.hang4 .cards {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.hang4 .card {
  flex: 1;
  min-width: 250px;
  background: #fff;
  border: 1px solid #ddd;
  padding: 20px;
  border-radius: 5px;
}


.hang5 {
  background: #e8f4ff;
  padding: 40px 0;
}

.hang5 ul {
  list-style: disc inside;
}

.hang5 li {
  margin-bottom: 10px;
}


.hang6 {
  background: #333;
  color: #fff;
  padding: 20px 0;
  text-align: center;
  font-size: 0.9em;
}