body {
  margin: 0;
  padding: 0;
  background: #000;
  font-family: 'Arial', sans-serif;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.presentation-container {
  width: 80%;
  max-width: 1280px;
  aspect-ratio: 16 / 9;
  background: #000;
  border: 4px solid #fff;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.swiper {
  width: 100%;
  height: 85%;
}

.swiper-slide {
  position: relative;
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
}

.slide-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: fadeIn 1s ease forwards;
}

.text-overlay {
  position: absolute;
  color: #fff;
  text-align: center;
  width: 90%;
  max-width: 1000px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  animation: fadeInUp 1s ease forwards 0.3s;
  opacity: 0;
}

.text-overlay h1 {
  font-size: 2.5rem;
  margin: 0 0 0.5rem 0;
  text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.8);
}

.text-overlay p {
  font-size: 1.25rem;
  margin: 0;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.6);
}

.controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 10px 0;
  background: #000;
}

.control-button {
  padding: 10px 30px;
  font-size: 1rem;
  background: #ff0000;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.3s;
}

.control-button:hover {
  background: #cc0000;
}

.control-button:disabled {
  background: #666;
  cursor: not-allowed;
}

@media (max-width: 1024px) {
  .presentation-container {
    width: 90%;
    max-width: 960px;
  }
  .text-overlay h1 {
    font-size: 2rem;
  }
  .text-overlay p {
    font-size: 1rem;
  }
}

@media (max-width: 768px) {
  .presentation-container {
    width: 95%;
    max-width: 640px;
  }
  .text-overlay h1 {
    font-size: 1.5rem;
  }
  .text-overlay p {
    font-size: 0.9rem;
  }
  .control-button {
    padding: 8px 20px;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .presentation-container {
    width: 98%;
    max-width: 426px;
  }
  .text-overlay h1 {
    font-size: 1.2rem;
  }
  .text-overlay p {
    font-size: 0.8rem;
  }
  .control-button {
    padding: 6px 15px;
    font-size: 0.8rem;
  }
}

@keyframes fadeIn {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

@keyframes fadeInUp {
  0% { opacity: 0; transform: translate(-50%, -30%); }
  100% { opacity: 1; transform: translate(-50%, -50%); }
}