* { margin:0; padding:0; box-sizing: border-box; }
body { font-family: Arial, sans-serif; color: #333; }
header { background: #003366; color: #fff; padding: 20px; position: relative; }
header h1 { display: inline-block; margin: 0; }
.phone-top { position: absolute; top: 20px; right: 20px; }
.phone-top a { background: #25D366; color: #fff; padding: 8px 15px; text-decoration: none; border-radius: 5px; }
nav ul { list-style: none; margin-top: 10px; }
nav ul li { display: inline-block; position: relative; }
nav ul li a { color: #fff; text-decoration: none; padding: 10px 15px; display: inline-block; }
nav ul li:hover { background: #005599; }
nav ul li ul.dropdown-content { display: none; position: absolute; background: #003366; min-width: 180px; }
nav ul li:hover ul.dropdown-content { display: block; }
nav ul li ul.dropdown-content li { display: block; }
main { padding: 20px; }
.slider { position: relative; width: 100%; max-height: 500px; overflow: hidden; }
.slider img { width: 100%; position: absolute; opacity: 0; transition: opacity 1s ease; }
.slider img.active { opacity: 1; position: relative; }
.images-grid { display: flex; flex-wrap: wrap; gap: 20px; margin: 20px 0; }
.images-grid img, .about-img { width: 100%; max-width: 600px; border-radius: 8px; }
footer { background: #003366; color: #fff; text-align: center; padding: 15px; margin-top: 20px; }
@media (max-width: 768px) {
  nav ul { display: block; }
  nav ul li { display: block; }
  nav ul li ul { position: static; }
  .images-grid { flex-direction: column; align-items: center; }
}