body {
  margin: 0;
  padding: 0;
  background: url('assets/bg.png') no-repeat center center fixed;
  background-size: cover;
  font-family: Arial, sans-serif;
  color: #fff;
}
.navbar {
  text-align: center;
  background: rgba(0,0,0,0.6);
  padding: 12px 8px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.navbar a {
  color: #fff;
  margin: 0 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
}
.container {
  background: rgba(0,0,0,0.55);
  margin: 60px auto;
  padding: 24px;
  max-width: 900px;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.5);
}
.signature {
  margin-top: 28px;
  font-style: italic;
  font-size: 1.05rem;
}
.img-responsive { max-width:100%; height:auto; border-radius:6px; }
@media (max-width:600px){
  .navbar a{display:inline-block; margin:6px;}
  .container{margin:20px 12px;}
}