:root {
  --primary-color: #333;
  --secondary-color: #666;
  --background-color: #fff;
  --text-color: #333;
  --link-color: #0066cc;
  --hover-color: #004499;
  --border-color: #e0e0e0;
}

body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

.site-header {
  background-color: var(--background-color);
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
}

.title {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.subtitle {
  font-size: 1rem;
  color: var(--secondary-color);
  margin-top: 0.5rem;
}

.counter-wrapper {
  font-weight: 400;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.counter {
  color: var(--primary-color);
  font-size: 1.2rem;
  font-weight: 700;
}

.gameplay-section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.version-nav {
  margin-bottom: 2rem;
  text-align: center;
}

.version-link {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 400;
  padding: 0.5rem 1rem;
  transition: all 0.3s ease;
  margin: 0 0.25rem;
  display: inline-block;
}

.version-link:hover {
  color: var(--hover-color);
}

.version-link.selected {
  color: var(--text-color);
  font-weight: 700;
  border-bottom: 2px solid var(--primary-color);
}

.carousel-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.carousel {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 450px;
}

.video-wrapper {
  display: none;
  background-color: var(--background-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  width: 100%;
  height: 100%;
}

.video-wrapper.active {
  display: block;
}

.video-wrapper video {
  width: 100%;
  height: calc(100% - 40px);
  display: block;
  object-fit: contain;
}

.video-wrapper a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 400;
  display: block;
  padding: 0.5rem;
  text-align: center;
  transition: background-color 0.3s;
}

.video-wrapper a:hover {
  background-color: #f0f0f0;
}

.carousel-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  padding: 1rem;
  cursor: pointer;
  font-size: 1.5rem;
  transition: background-color 0.3s;
}

.carousel-button:hover {
  background-color: rgba(0, 0, 0, 0.7);
}

.carousel-button.prev {
  left: 1rem;
}

.carousel-button.next {
  right: 1rem;
}

@media (max-width: 768px) {
  .gameplay-section {
    padding: 1rem;
  }

  .title {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 0.9rem;
  }

  .carousel {
    height: 350px;
  }

  .carousel-button {
    padding: 0.5rem;
    font-size: 1rem;
  }
}