/* Reset and base */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: Arial, sans-serif;
  color: white;
  text-align: center;
  background: url('https://images.unsplash.com/photo-1586023492125-27b2c045efd7?auto=format&fit=crop&w=1920&q=80') center/cover no-repeat fixed;
  min-height: 100vh;
}

/* Dark overlay for readability */
.overlay {
  background: rgba(0, 0, 0, 0.55);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem;
}

/* Header */
header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.tagline {
  font-size: 1.2rem;
  color: #d1f7d1;
}

/* Main Content */
main {
  margin-top: 3rem;
}
.intro {
  font-size: 1.3rem;
  margin-bottom: 2rem;
}
.btn {
  display: inline-block;
  background: #3d9970;
  color: white;
  padding: 0.75rem 1.5rem;
  margin: 0.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 1.2rem;
  transition: background 0.3s;
}
.btn:hover { background: #2e7d5b; }
.btn.alt {
  background: #444;
}
.small {
  margin-top: 1.5rem;
  font-size: 0.9rem;
}
.small a {
  color: #a7f0a7;
  text-decoration: none;
}
.small a:hover { text-decoration: underline; }

/* Footer */
footer {
  margin-top: 3rem;
  font-size: 0.8rem;
  color: #ddd;
}

/* Responsive */
@media (max-width: 600px) {
  header h1 { font-size: 2rem; }
  .intro { font-size: 1.1rem; }
  .btn { font-size: 1rem; padding: 0.6rem 1.2rem; }
}