header {
  text-align: center;
  padding: 1.5em 1em 1em 1em;
  background: #eaf3fb; /* leichtes Blau */
  box-shadow: 0 2px 8px #b3c6e0;
  border-bottom-left-radius: 0.5em;
  border-bottom-right-radius: 0.5em;
  position: relative;
}
header nav {
  display: inline-block;
  font-size: 1.1em;
  background: #f7fbff;
  border-radius: 0.5em;
  padding: 0.5em 1em;
  box-shadow: 0 1px 4px #b3c6e0;
}
header nav a, header nav button {
  margin: 0 1em;
  text-decoration: none;
  color: #205081;
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1em;
  transition: color 0.2s;
}
header nav a:hover, header nav button:hover {
  color: #4b79a1;
}
header nav div {
  display: inline-block;
  position: relative;
}
header nav div ul {
  display: none;
  position: absolute;
  left: 0;
  top: 2.2em;
  background: #f7fbff;
  box-shadow: 0 2px 8px #b3c6e0;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 160px;
  z-index: 10;
  border-radius: 0 0 0.5em 0.5em;
  border: 1px solid #b3c6e0;
}
header nav div:hover ul,
header nav div:focus-within ul {
  display: block;
}
header nav div ul li a {
  display: block;
  padding: 0.8em 1.5em;
  color: #205081;
  text-decoration: none;
  border-bottom: 1px solid #eaf3fb;
  transition: background 0.2s, color 0.2s;
}
header nav div ul li:last-child a {
  border-bottom: none;
}
header nav div ul li a:hover {
  background: #eaf3fb;
  color: #4b79a1;
}
header nav button:focus {
  outline: 2px solid #4b79a1;
}
.header-login {
  position: absolute;
  right: 2em;
  top: 1.5em;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.header-login a {
  color: #205081;
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  font-size: 1em;
  transition: color 0.2s;
}
.header-login a:hover {
  color: #4b79a1;
}
.header-login svg {
  width: 2em;
  height: 2em;
  vertical-align: middle;
  fill: #205081;
  transition: fill 0.2s;
}
.header-login a:hover svg {
  fill: #4b79a1;
}
@media (max-width: 700px) {
  header h1 { font-size: 1.1em; }
  header nav { font-size: 1em; }
  .header-login { right: 0.5em; top: 1em; }
}
footer {
  text-align: center;
  padding: 2em 1em 1.5em 1em;
  background: #eaf3fb;
  color: #205081;
  font-family: 'Segoe UI', 'Arial', sans-serif;
  font-size: 1.05em;
  border-top-left-radius: 0.5em;
  border-top-right-radius: 0.5em;
  margin-top: 3em;
  box-shadow: 0 -2px 8px #b3c6e0;
  position: relative;
}