body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    
}
.top-bar, .main-menu {
    background-color: #fff;
    padding: 10px 20px;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #343a40;
  min-width: 200px;
  z-index: 1;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.dropdown-content.show {
  display: block;
}
.logo img {
    height: 40px;
    vertical-align: middle;
}
.main-menu ul {
    list-style: none;
    padding: 0;
    display: flex;
    gap: 15px;
}
.main-menu a {
    text-decoration: none;
    font-weight: bold;
    color: #333;
}
.image-section, .poem {
    padding: 20px;
    background: white;
    margin: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.demo-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

.two-columns {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  padding: 20px;
  margin: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
}

.left-block img {
  width: 100%;
  max-width: 550px;
  border-radius: 10px;
}

.right-block {
  max-width: 300px;
  text-align: center;
}

.right-block h3 {
  margin-top: 0;
  font-size: 18px;
  color: #333;
}

.right-block img {
  width: 100%;
  border-radius: 10px;
}

.section-title {
  cursor: pointer;
  background-color: #f0f0f0;
  padding: 12px;
  margin: 20px;
  border-radius: 8px;
  font-size: 18px;
  font-weight: bold;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.image-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  padding: 10px 20px;
}

.image-gallery img {
  width: calc(33.333% - 10px);
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.hidden {
  display: none;
}
.main-title {
  font-size: 36px;
  font-weight: 800;
  text-align: center;
  font-family: 'Georgia', serif;
  color: #1a1a1a;
  margin-bottom: 5px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}
/* Dropdown menu */
.main-menu ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  background: #fff;
  display: flex;
}

.main-menu li {
  position: relative;
}

.main-menu a {
  display: block;
  padding: 10px 15px;
  text-decoration: none;
  color: #000;
}

/* Dropdown content ẩn mặc định */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  z-index: 1;
  box-shadow: 0px 8px 16px rgba(0,0,0,0.2);
}

/* Style cho các item trong dropdown */
.dropdown-content li a {
  padding: 10px 15px;
  display: block;
  color: #333;
}

.dropdown-content li a:hover {
  background-color: #f1f1f1;
}

/* Khi hover thì hiện menu con */
.dropdown:hover .dropdown-content {
  display: block;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #343a40;
  min-width: 200px;
  z-index: 1;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.dropdown-content.show {
  display: block;
}