body {
  font-family: 'Helvetica Neue', sans-serif;
  margin: 0;
  background: linear-gradient(to bottom, #ffffff, #f5f5f5);
  color: #333;
}
header {
  background-color: #fff;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.hero {
  text-align: center;
  padding: 50px 20px;
}
.logo-preview img {
  display: block;
  margin: 0 auto;
  max-width: 200px;
  opacity: 0.5;
}
.bot {
  position: fixed;
  bottom: 20px;
  right: 20px;
}
.bot-window {
  background: #fff;
  border-radius: 12px;
  padding: 10px 15px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  animation: slideUp 0.6s ease-in-out;
}
@keyframes slideUp {
  from { transform: translateY(100px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}