* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background: url('background.jpg') no-repeat center center fixed;
  background-size: cover;
  color: white;
  scroll-behavior: smooth;
  text-align: center;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.6);
  z-index: -1;
}

header, footer {
  background: rgba(0, 0, 0, 0.85);
  padding: 20px;
  color: #ffd700;
}

nav a {
  margin: 0 10px;
  color: white;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  color: #ffd700;
}

main#slider {
  overflow: hidden;
  position: relative;
  height: 100vh;
}

.page {
  position: absolute;
  top: 0;
  left: 100%;
  width: 100%;
  height: calc(100vh - 160px);
  padding: 40px 20px;
  background: transparent;
  transition: left 0.6s ease;
}

.page.active {
  left: 0;
}

.btn {
  display: inline-block;
  margin: 10px;
  padding: 12px 20px;
  background: #ffd700;
  color: black;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}

.btn:hover {
  background: #ffc400;
}

.btn.whatsapp {
  background: #25D366;
  color: white;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin: 10px 0;
  font-size: 18px;
}