* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  background: #1e1b26;
  color: #eee7f5;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

img { image-rendering: pixelated; }

.topbar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: #2a2436;
  border-bottom: 2px solid #443a5a;
}
.topbar h1 { font-size: 18px; margin: 0; }
.link-btn { color: #eee7f5; text-decoration: none; padding: 5px 9px; margin-right: auto; }
.link-btn:hover { text-decoration: underline; }
.room-size-control input { width: 48px; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }

button, select, input {
  font-family: inherit;
  font-size: 13px;
  background: #3a3150;
  color: #eee7f5;
  border: 1px solid #574a76;
  border-radius: 6px;
  padding: 5px 9px;
  cursor: pointer;
}
button:hover { background: #4a3f68; }
button.danger { background: #5c2a35; border-color: #7a3a45; }
button.danger:hover { background: #742836; }
.file-btn { display: inline-block; }

.layout {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.palette {
  width: 260px;
  min-width: 200px;
  background: #241f30;
  border-right: 2px solid #443a5a;
  display: flex;
  flex-direction: column;
  padding: 10px;
  gap: 8px;
  overflow-y: auto;
}
.palette-controls { display: flex; flex-direction: column; gap: 6px; }
.category-tabs { display: flex; flex-wrap: wrap; gap: 4px; }
.category-tabs button { flex: 1 1 auto; padding: 4px 6px; }
.category-tabs button.active { background: #6a4fa0; border-color: #8a6fc0; }

.level-panel {
  background: #322a44;
  border: 1px solid #4a3f68;
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
}
.level-panel[hidden], .inspiration-panel[hidden], .row-check[hidden] { display: none; }
.level-panel label { display: flex; flex-direction: column; gap: 3px; }
.level-panel select { width: 100%; }
.level-actions { display: flex; gap: 6px; }
.level-actions button { flex: 1; }
.row-check { flex-direction: row !important; align-items: center; gap: 6px !important; }

.room-background {
  position: absolute;
  top: 0; left: 0;
  pointer-events: none;
  image-rendering: pixelated;
  z-index: 0;
}

.room-reference {
  position: absolute;
  top: 0; left: 0;
  opacity: .3;
  pointer-events: none;
  image-rendering: pixelated;
}

.inspiration-panel img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid #4a3f68;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  overflow-y: auto;
}
.palette-item {
  background: #322a44;
  border: 1px solid #4a3f68;
  border-radius: 8px;
  padding: 6px;
  text-align: center;
  cursor: grab;
  user-select: none;
  touch-action: none;
}
.palette-item img {
  width: 100%;
  height: 56px;
  object-fit: contain;
}
.palette-item .label { font-size: 11px; margin-top: 4px; opacity: .85; overflow-wrap: break-word; }
.palette-item .size { font-size: 10px; opacity: .55; }
.hint { font-size: 11px; opacity: .6; line-height: 1.4; }

.stage-wrap {
  flex: 1;
  overflow: auto;
  background: #14121a;
  display: flex;
}
.stage-scroll { margin: auto; padding: 30px; }

.room {
  position: relative;
  background-color: #2b2438;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.06) 1px, transparent 1px);
  outline: 2px dashed #574a76;
}

.placed-item {
  position: absolute;
  cursor: grab;
  touch-action: none;
}
.placed-item img { width: 100%; height: 100%; display: block; pointer-events: none; }
.placed-item.selected { outline: 2px solid #ffcf5c; outline-offset: 2px; }
.placed-item.dragging { opacity: .75; }
.placed-item.flipped img { transform: scaleX(-1); }

.item-toolbar {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: #2a2436;
  border: 1px solid #574a76;
  border-radius: 8px;
  padding: 6px;
  display: flex;
  gap: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
}

@media (max-width: 720px) {
  .layout { flex-direction: column; }
  .palette { width: 100%; max-height: 40vh; border-right: none; border-bottom: 2px solid #443a5a; }
}