/* Font tiếng Việt hỗ trợ đa nền tảng */
body {
  font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', 'Arial', sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 0;
  color: #111;
  line-height: 1.6;
}

main {
  max-width: 1200px;
  margin: auto;
  padding: 20px;
  text-align: center;
}

.title {
  font-size: 2.5em;
  color: #2ecc71; /* xanh lá cây */
  margin-bottom: 20px;
}

.intro {
  font-size: 1.1em;
  color: #000;
  margin-bottom: 30px;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin-bottom: 40px;
}

.gallery img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.section-title {
  color: red;
  font-size: 1.6em;
  margin-bottom: 20px;
}

.videos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.videos iframe {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 8px;
}

.contact {
  color: red;
  font-size: 1.2em;
  margin-bottom: 50px;
}

.download-instruction {
  color: #cc0000; /* đỏ đậm */
  font-weight: bold;
  font-size: 1.1em;
  margin-bottom: 30px;
  text-align: center;
}

.download-link {
  color: #0077cc; /* xanh nhấn link */
  text-decoration: underline;
}
.download-link:hover {
  color: #0055aa;
}


footer {
  font-size: 0.9em;
  color: #333;
  padding: 10px;
  background-color: #eee;
  text-align: center;
}