body, html {
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif;
  color: #fff;
  background-color: #001219;
  box-sizing: border-box;
}
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: rgba(0,0,0,0.7);
}
.logo {
  height: 50px;
}
.phone {
  color: #fff;
  text-decoration: none;
  font-size: 16px;
}
.hero {
  background-size: cover;
  background-position: center;
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.overlay {
  background-color: rgba(0,0,0,0.6);
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  padding: 20px;
}
.content h1 {
  font-size: 32px;
  margin-bottom: 10px;
}
.subheadline, .author {
  font-size: 18px;
  margin-bottom: 15px;
}
.engineer {
  width: 120px;
  margin: 20px auto;
  display: block;
}
.arrow {
  width: 30px;
  height: 30px;
  border-left: 4px solid #fff;
  border-bottom: 4px solid #fff;
  transform: rotate(-45deg);
  margin: 20px auto;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: rotate(-45deg) translateY(0); }
  50% { transform: rotate(-45deg) translateY(10px); }
}
.buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  justify-content: center;
}
.btn {
  background: #2ec4b6;
  color: #fff;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  display: flex;
  align-items: center;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
}
.btn img {
  width: 20px;
  height: 20px;
  margin-right: 10px;
}
.btn.telegram { background: #0088cc; }
.btn.whatsapp { background: #25d366; }
.btn:hover { opacity: 0.8; }
footer {
  text-align: center;
  padding: 10px;
  background: rgba(0,0,0,0.7);
  font-size: 14px;
}
/* Анимация появления */
.fade-in {
  opacity: 0;
  animation: fadeIn ease-in 1;
  animation-fill-mode: forwards;
  animation-duration: 1s;
}
@keyframes fadeIn {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}