body {
  margin: 0;
  font-family: "Be Vietnam Pro", sans-serif;
  background: linear-gradient(135deg, #8b0000, #b71c1c);
  color: #fff8e1;
  line-height: 1.6;
}
header {
  background: linear-gradient(135deg, #d32f2f, #ffcc00);
  border-radius: 20px;
  margin: 15px;
  padding: 15px 30px;
  position: sticky;
  top: 10px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.3);
}

.noidungbentrong h3 {
  font-size: 32px;
  color: #060606;
  font-weight: bold;
}
.nav a {
  color: #0c0c0c;
  font-weight: bold;
  padding: 10px 15px;
  border-radius: 8px;
  transition: 0.3s;
}

.nav a:hover {
  background: #ffcc00;
  color: #b71c1c;
}
section,
.main-vanhoa,
.phongtuc {
  max-width: 1000px;
  margin: 40px auto;
  padding: 25px;
  background: #000000;
  color: #b71c1c;
  border-radius: 15px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}
h1, h2 {
  color: #000000;
  text-align: left;
  font-weight: bold;
}

h3 {
  color: #000000;
}
img {
  display: block;
  margin: 25px auto;
  max-width: 90%;
  height: auto;
  border: 5px solid #ffcc00;
  border-radius: 15px;
}
.khampha a {
  background: #ffcc00;
  color: #b71c1c;
  padding: 12px 30px;
  border-radius: 30px;
  font-weight: bold;
  text-decoration: none;
  transition: 0.3s;
}

.khampha a:hover {
  background: #fff;
  color: #d32f2f;
}
body::after {
  content: "🌸 🌼 🌸 🌼 🌸";
  position: fixed;
  bottom: 10px;
  right: 10px;
  font-size: 25px;
  opacity: 0.4;
}