body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #111;
  color: #eee;
  display: flex;
}

/* Sidebar */
.sidebar {
  height: 100vh;
  width: 250px;
  background: #222;
  padding-top: 20px;
  position: fixed;
  top: 0;
  left: 0;
  overflow-x: hidden;
  transition: 0.3s;
}

.sidebar a {
  display: block;
  color: #eee;
  padding: 12px 20px;
  text-decoration: none;
  font-weight: bold;
}

.sidebar a:hover {
  background: #333;
  color: #ff7f32;
}

.sidebar .closebtn {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 28px;
  color: #eee;
  cursor: pointer;
}

/* Hauptinhalt */
.main {
  margin-left: 250px;
  padding: 20px;
  flex: 1;
  transition: margin-left 0.3s;
}

/* Button Style */
.button {
  display: inline-block;
  padding: 12px 20px;
  margin: 10px 0;
  font-size: 16px;
  font-weight: bold;
  text-decoration: none;
  border-radius: 8px;
  color: white;
  transition: background 0.2s ease;
}

.button.green { background: #28a745; }
.button.green:hover { background: #218838; }

.button.orange { background: #ff7f32; }
.button.orange:hover { background: #e56f20; }