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

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
  font-family: 'Segoe UI', Arial, sans-serif;
}

.gallery-container {
  position: fixed;
  inset: 0;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.image-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#gallery-image {
  width: 100vw;
  height: 100vh;
  object-fit: contain;
  display: block;
  transition: opacity 0.35s ease;
}


.dots {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  border: 1px solid rgba(255,255,255,0.5);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.dot.active {
  background: #fff;
  transform: scale(1.3);
}

.nav-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 50%;
  width: 52px;
  height: 52px;
  font-size: 1.5rem;
  color: #fff;
  cursor: pointer;
  z-index: 10;
  transition: background 0.2s, border-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.nav-btn:hover {
  background: rgba(255,255,255,0.22);
  border-color: rgba(255,255,255,0.4);
}

.left {
  left: 16px;
}
.right {
  right: 16px;
}

@media (max-width: 600px) {
  .nav-btn {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
  .left {
    left: 8px;
  }
  .right {
    right: 8px;
  }
}