* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #020611;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

.screen {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at center, #071629 0%, #020611 70%);
}

.lqip-image,
.full-image,
.hotspots {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.lqip-image {
  display: block;
  user-select: none;
  filter: blur(20px);
  transform: scale(1.02);
  opacity: 1;
  transition: opacity 0.5s ease-out;
}

.lqip-image.hidden {
  opacity: 0;
}

.full-image {
  display: block;
  user-select: none;
  opacity: 0;
  transition: opacity 0.6s ease-out;
}

.full-image.loaded {
  opacity: 1;
}

.hotspots {
  z-index: 2;
  pointer-events: none;
}

.hotspots a {
  pointer-events: auto;
  cursor: pointer;
}

.hotspot-circle {
  fill: transparent;
  stroke: transparent;
  stroke-width: 4;
  transition: fill 0.2s ease, stroke 0.2s ease;
}

.hotspot-rect {
  fill: transparent;
  stroke: transparent;
  stroke-width: 4;
  transition: fill 0.2s ease, stroke 0.2s ease;
}

.hotspots a:hover .hotspot-circle,
.hotspots a:focus .hotspot-circle,
.hotspots a:hover .hotspot-rect,
.hotspots a:focus .hotspot-rect {
  fill: rgba(255, 128, 54, 0.2);
  stroke: rgba(255, 180, 88, 0.9);
}

.back {
  position: fixed;
  z-index: 3;
  padding: 10px 16px;
  border: 1px solid rgba(255, 190, 90, 0.75);
  border-radius: 999px;
  color: #ffe7a9;
  background: rgba(2, 8, 20, 0.7);
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 0.04em;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 18px rgba(255, 150, 50, 0.18);
}


.back {
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  min-height: 156px;
  padding: 18px 10px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  line-height: 1.25;
}

.back:hover,
.back:focus {
  color: #fff;
  background: rgba(255, 128, 54, 0.28);
  outline: none;
}