body {
  background: #f7f7fa;
  color: #222;
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
}
nav {
  position: fixed;
  left: 0;
  top: 0;
  width: 200px;
  height: 100vh;
  background: #2c3e50;
  color: #fff;
  padding-top: 30px;
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
nav li {
  margin: 20px 0;
}
nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}
main {
  margin-left: 220px;
  padding: 40px;
}
h1, h2, h3 {
  font-family: 'Segoe UI', Arial, sans-serif;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}
h1 { font-size: 2.2em; color: #34495e; }
h2 { font-size: 1.6em; color: #2980b9; }
h3 { font-size: 1.2em; color: #16a085; }
img {
  max-width: 100%;
  height: auto;
  margin: 20px 0;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(44,62,80,0.08);
}
.image-row {
  display: flex;
  flex-direction: row;
  gap: 20px;
  overflow-x: auto;
  padding: 20px 0;
}
.image-row img {
  flex: 0 0 auto;
  max-width: 400px;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(44,62,80,0.08);
}