.demo-wrapper {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 40px auto;
  border-radius: 20px;
  overflow: hidden;
}

/* Заставка */
.demo-cover {
  position: relative;
  width: 100%;
  height: 500px;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden; /* важно! */
}

/* Картинка внутри заставки */
.demo-cover-image {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover; /* как background-size: cover */
  z-index: 1;
}

/* Кнопка PLAY DEMO */
.demo-btn {
  position: absolute;
  bottom: 40px;
  padding: 18px 40px;
  font-size: 28px;
  background: #ffd23c;
  border-radius: 50px;
  border: 4px solid #000;
  color: #000;
  font-weight: 900;
  cursor: pointer;
  transition: 0.2s;
  z-index: 2; /* поверх картинки */
}

.demo-btn:hover {
  transform: scale(1.05);
  background: #ffe45e;
}

/* Loading screen */
.loading-screen {
  display: none;
  width: 100%;
  height: 500px;
  background: #000a14;
  color: #fff;
  font-size: 28px;
  font-weight: 700;
  justify-content: center;
  align-items: center;
}

.loading-inner {
  text-align: center;
}

.loader {
  border: 6px solid #133445;
  border-top: 6px solid #00eaff;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  100% {
    transform: rotate(360deg);
  }
}

/* iframe demo */
.demo-iframe {
  width: 100%;
  height: 500px;
  border: none;
  display: none;
}