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

body {
  background: #000;
  font-family: "Poppins", sans-serif;
  min-height: 100vh;
}

.demo-gallery {
  max-width: 473px;
  margin: 0 auto;
  padding-bottom: 120px;
}

.demo-gallery img {
  display: block;
  width: 100%;
  height: auto;
}

.demo-cta-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px 20px;
  background: linear-gradient(to top, rgba(0,0,0,0.95) 60%, transparent);
  z-index: 100;
  display: flex;
  justify-content: center;
}

.demo-buy-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 400px;
  padding: 14px 20px 10px;
  background: linear-gradient(0deg, #ffeb00 0%, #ffa726 100%);
  color: #000;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  border-radius: 8px;
  line-height: 1.3;
  animation: headShake 2s infinite;
}

.demo-buy-btn s {
  opacity: 0.7;
}

.offer-tag {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 14px;
  background: #111;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  border-radius: 20px;
}

@keyframes headShake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-3px); }
  20%, 40%, 60%, 80% { transform: translateX(3px); }
}

@media (min-width: 768px) {
  .demo-buy-btn {
    font-size: 22px;
    padding: 18px 24px 12px;
  }
}