html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #111;
  color: #f0f0f0;
}

header {
  background: #1a1a1a;
  padding: 1em;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

header h1 {
  margin: 0;
  font-size: 1.8em;
}

nav {
  margin-top: 10px;
}

nav a {
  color: #ccc;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  color: #fff;
  text-decoration: underline;
}

main {
  padding: 2em;
  max-width: 900px;
  margin: auto;
}

section {
  margin-bottom: 4em;
}

img.bildgroesse {
  width: 100%;
  max-width: 600px;
  border-radius: 10px;
  margin-top: 1em;
  box-shadow: 0 0 10px #000;
}

footer {
  background: #1a1a1a;
  color: #aaa;
  text-align: center;
  padding: 1em;
  margin-top: 2em;
}