body {
  font-family: Arial, sans-serif;
  background: #f4f9fd;
  margin: 0;
  padding: 0;
}
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 15px;
  background-color: white;
  border-bottom: 1px solid #ddd;
}
.header-left {
  display: flex;
  align-items: center;
}
.brand-logo {
  height: 36px;
  margin-right: 8px;
}
.telegram-text {
  font-size: 20px;
  font-weight: bold;
  color: #3a4b61;
}
.download-btn {
  background-color: #3b82f6;
  color: white;
  padding: 8px 18px;
  border-radius: 24px;
  font-weight: bold;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.download-btn img {
  height: 18px;
}
.card {
  background-color: white;
  max-width: 360px;
  margin: 40px auto;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  text-align: center;
  padding: 24px;
  position: relative;
}
.card img.profile {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid white;
  margin-top: -60px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}
.card h2 {
  margin: 12px 0 4px;
  font-size: 22px;
}
.card p {
  color: #555;
  font-size: 14px;
  margin: 8px 0;
}
.join-btn {
  display: inline-block;
  position: relative;
  overflow: hidden;
  background-color: #007bff;
  color: white;
  padding: 12px 24px;
  margin-top: 16px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: bold;
  text-decoration: none;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transition: transform 0.2s ease;
}
.join-btn:hover {
  transform: translateY(-2px);
}
.join-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: linear-gradient(120deg, rgba(255,255,255,0.3), rgba(255,255,255,0));
  transform: skewX(-20deg);
  animation: shine 2s infinite;
}
@keyframes shine {
  0% { left: -75%; }
  50% { left: 125%; }
  100% { left: 125%; }
}
#changing-line {
  font-size: 16px;
  font-weight: bold;
  color: black;
  margin-top: 20px;
}