.dropdown {
  position: relative;
}

.dropdown > a::after {
  content: ""; /* Xoá mũi tên ▼ */
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #ffffff;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 999;
  min-width: 200px;
  padding: 8px 0;
  overflow: hidden;
}

.dropdown-content li {
  text-align: left;
  width: 100%;
}

.dropdown-content li a {
  display: block;
  padding: 10px 16px;
  color: #333;
  font-size: 15px;
  text-decoration: none;
  transition: background 0.25s ease;
  white-space: nowrap;
}

.dropdown-content li a:hover {
  background-color: #f5f5f5;
  color: #000;
}

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


table {
          width: 100%;
          border-collapse: collapse;
          border: 3px solid blue; /* Viền ngoài đậm màu đỏ */
          text-align: center;
        }

        th,
        td {
          border: 1px solid #333; /* Đường kẻ đơn mảnh cho các ô */
          padding: 8px;
        }

        th {
          background-color: lightgray;
        }

header {
        background-color: #5a4fcf;
        color: white;
        padding: 20px;
        text-align: center;
      }
      header .logo {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
      }
      header img {
        height: 50px;
      }
      nav {
        background-color: #4139b1;
        padding: 10px;
        text-align: center;
      }
      nav a {
        color: white;
        text-decoration: none;
        margin: 0 15px;
        font-weight: bold;
        font-size: 16px;
      }
      nav a:hover {
        text-decoration: underline;
      }
      main.content {
        max-width: 1000px;
        margin: 0 auto;
        padding: 20px;
      }
      section.poem {
        background-color: #ffffff;
        border: 1px solid #ddd;
        border-radius: 10px;
        padding: 20px;
        margin-bottom: 30px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
      }
      section.poem h2 {
        font-family: "Playfair Display", serif;
        color: #5a4fcf;
      }
      section.poem a {
        color: #1a73e8;
        font-weight: bold;
      }
      .video iframe {
        width: 100%;
        max-width: 560px;
        height: 315px;
        border: none;
        margin-top: 10px;
      }
      section.comments {
        max-width: 1000px;
        margin: 40px auto;
        padding: 20px;
        background: #f1f1f1;
        border-radius: 10px;
      }
      section.comments h3 {
        color: #5a4fcf;
      }

.honor-section {
        max-width: 1000px;
        margin: 40px auto;
        text-align: center;
      }

      .honor-title {
        color: #5a4fcf;
        margin-bottom: 20px;
      }

      .honor-image {
        max-width: 100%;
        height: auto;
        border-radius: 10px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        margin-bottom: 30px;
      }

      .honor-description {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 30px;
      }

      .honor-column {
        flex: 1 1 45%;
        display: flex;
        flex-direction: column;
        gap: 15px;
        text-align: left;
      }

      .honor-column.right {
        text-align: right;
      }

      .honor-caption {
        font-size: 16px;
        font-weight: bold;
body {
  margin: 0;
  padding: 0;
  background-image: url('tranh-dan-tuong-3d-bien-xanh-cat-trang-nang-vang.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  height: 100vh;
  font-family: 'Roboto', sans-serif;
}

header {
  background-color: #5a4fcf;
  color: white;
  padding: 20px;
  text-align: center;
}

header .logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

header img {
  height: 50px;
}

nav {
  background-color: #4139b1;
  padding: 10px;
  text-align: center;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 15px;
  font-weight: bold;
  font-size: 16px;
}

nav a:hover {
  text-decoration: underline;
}

main.content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}

table {
  border-collapse: collapse;
  width: 90%;
  margin: 20px auto;
  background: #fff;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  border: 3px solid blue;
  text-align: center;
}

th,
td {
  border: 1px solid #333;
  padding: 8px 10px;
}

th {
  background-color: lightgray;
}

.s1 {
  background-color: #90caf9;
  font-weight: bold;
}

.s2 {
  background-color: #fff176;
  font-weight: bold;
}

.red {
  color: red;
}

section.poem {
  background-color: #ffffff;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

section.poem h2 {
  font-family: "Playfair Display", serif;
  color: #5a4fcf;
}

section.poem a {
  color: #1a73e8;
  font-weight: bold;
}

.video iframe {
  width: 100%;
  max-width: 560px;
  height: 315px;
  border: none;
  margin-top: 10px;
}

section.comments {
  max-width: 1000px;
  margin: 40px auto;
  padding: 20px;
  background: #f1f1f1;
  border-radius: 10px;
}

section.comments h3 {
  color: #5a4fcf;
}

form {
  max-width: 800px;
  margin: 20px auto;
  padding: 20px;
  background: #ffffffcc;
  border-radius: 10px;
  box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

form label {
  font-weight: bold;
}

form textarea,
form input[type="email"] {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

form button {
  margin-top: 10px;
  padding: 10px 20px;
  background-color: #5a4fcf;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

form button:hover {
  background-color: #4139b1;
}

!------------------------
             body {
        font-family: "Roboto", sans-serif;
        margin: 0;
        background: #f0f2f5;
        color: #333;
      }
      header {
        background: url("tranh-dan-tuong-3d-bien-xanh-cat-trang-nang-vang.jpg") no-repeat center center/cover;
        padding: 60px 20px;
        text-align: center;
        color: white;
      }
      header h1 {
        font-family: "Playfair Display", serif;
        font-size: 42px;
        margin: 0;
        text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.6);
      }

      nav.main-menu {
        background: #343a40;
      }

      .contact-section {
  background-color: #1d3557;
  color: white;
  padding: 40px 20px;
  text-align: center;
}
.contact-container {
  max-width: 800px;
  margin: 0 auto;
}
.contact-container h2 {
  font-size: 26px;
  margin-bottom: 20px;
  font-family: "Playfair Display", serif;
  color: #ffd700;
}
.contact-details p {
  font-size: 16px;
  margin: 10px 0;
}
.contact-details a {
  color: #ffdd57;
  text-decoration: none;
}
.contact-details a:hover {
  text-decoration: underline;
}

      nav.main-menu ul {
        list-style-type: none;
        margin: 0;
        padding: 10px 0;
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
      }
      nav.main-menu ul li {
        position: relative;
        margin: 0 15px;
      }
      nav.main-menu ul li a {
        color: white;
        font-weight: bold;
        font-size: 16px;
        text-decoration: none;
        padding: 10px 14px;
        display: inline-block;
        border-radius: 5px;
      }
      nav.main-menu ul li a:hover {
        background-color: rgba(255, 255, 255, 0.1);
      }

      nav.main-menu ul li:hover .dropdown-content {
        display: block;
      }

      nav.main-menu ul li .dropdown-content {
        display: none;
        position: absolute;
        top: 100%;
        background-color: #343a40;
        min-width: 220px;
        border-radius: 0 0 10px 10px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        z-index: 1;
      }
      .dropdown-content li {
        text-align: left;
      }
      .dropdown-content li a {
        padding: 12px 16px;
        color: white;
        display: block;
      }
      .dropdown-content li a:hover {
        background-color: rgba(255, 255, 255, 0.1);
      }

      .marquee-container {
  overflow: hidden;
  white-space: nowrap;
  background-color: #343a40;
  color: #ffd700;
  padding: 10px 0;
  font-size: 24px;
  font-weight: bold;
  font-family: "Playfair Display", serif;
  position: relative;
}

.marquee {
  display: inline-block;
  padding-left: 100%;
  animation: marquee 15s linear infinite;
}

@keyframes marquee {
  0% {
    transform: translateX(0%);
  }
  100% {
    transform: translateX(-100%);
  }
}


      .datetime {
        text-align: center;
        font-size: 14px;
        margin: 10px 0;
        color: #555;
      }

      .content {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 40px;
        padding: 40px 20px;
      }

      .card {
        background: white;
        border-radius: 12px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        max-width: 500px;
        width: 100%;
        overflow: hidden;
        text-align: center;
      }
      .card img {
        width: 100%;
        height: 300px;
        object-fit: cover;
      }
      .card h3 {
        margin: 20px 0 10px;
        font-family: "Playfair Display", serif;
        font-size: 22px;
        color: #1d3557;
      }
      .card p {
        padding: 0 20px 20px;
        font-size: 16px;
        color: #444;
      }

      footer {
        text-align: center;
        padding: 20px;
        font-size: 14px;
        color: #888;
      }