body {
  margin: 0;
  font-family: 'Open Sans', sans-serif;
  background: linear-gradient(to bottom, #cbe6ff, #edf6ff);
  color: #333;
  line-height: 1.6;
}

header {
  background: linear-gradient(to right, #a6d8ff, #d0ebff);
  padding: 20px;
  text-align: center;
  font-family: 'Source Serif Pro', serif;
}

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

h2 {
  color: #004e89;
  margin-top: 30px;
}

h3 {
  color: #006c9f;
  font-weight: 600;
}

nav a {
  color: #006db3;
  text-decoration: none;
  font-weight: bold;
}

section {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

iframe {
  width: 100%;
  max-width: 560px;
  border-radius: 10px;
  margin: 20px auto;
  display: block;
}

footer {
  background-color: #f0f8ff;
  text-align: center;
  padding: 15px;
  font-size: 0.9em;
  border-top: 1px solid #ddd;
}