:root {
  --bg: #0f1419;
  --panel: #1a222c;
  --panel2: #243040;
  --border: #2f3d4d;
  --text: #e8eef4;
  --muted: #8fa3b8;
  --accent: #e8a35c;
  --accent2: #5cb8e8;
  --danger: #e86a5c;
  --ok: #6bcf8e;
  --grid: #2a3848;
  --cell: #1e2a36;
  --snap: #e8a35c88;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text);
  overflow: hidden;
}
button, select, input {
  font: inherit; color: var(--text);
  background: var(--panel2); border: 1px solid var(--border);
  border-radius: 6px; padding: 6px 10px; cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary { background: #3a2a18; border-color: var(--accent); color: #ffd9a8; }
button.danger { background: #3a1e1a; border-color: var(--danger); color: #ffc4bc; }
button:disabled { opacity: 0.45; cursor: not-allowed; }
.app {
  display: grid;
  grid-template-columns: 280px 1fr 300px;
  grid-template-rows: 56px 1fr;
  height: 100%;
}
.topbar {
  grid-column: 1 / -1;
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px; background: var(--panel);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.topbar h1 {
  font-size: 14px; margin: 0 8px 0 0; font-weight: 600;
  white-space: nowrap;
}
.topbar .badge {
  font-size: 11px; font-weight: 500; color: #ffd9a8;
  background: #3a2a18; border: 1px solid var(--accent);
  border-radius: 999px; padding: 1px 8px; margin-left: 4px;
}
.topbar .spacer { flex: 1; min-width: 8px; }
.topbar .hint { color: var(--muted); font-size: 12px; white-space: nowrap; }
.panel {
  background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.panel.right { border-right: none; border-left: 1px solid var(--border); }
.panel h2 {
  margin: 0; padding: 10px 12px; font-size: 13px;
  border-bottom: 1px solid var(--border); color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.panel .tools {
  padding: 8px 10px; display: flex; flex-wrap: wrap; gap: 6px;
  border-bottom: 1px solid var(--border);
}
.tabs { display: flex; gap: 4px; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.tabs button { flex: 1; font-size: 12px; padding: 6px 4px; }
.tabs button.active { background: #2a3d28; border-color: var(--ok); color: #c8f0d4; }
.palette-list, .item-list {
  flex: 1; overflow: auto; padding: 8px;
}
.palette-group { margin-bottom: 12px; }
.palette-group .g-title {
  font-size: 11px; color: var(--muted); margin: 4px 2px 6px;
}
.palette-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px;
}
.pal-item {
  background: var(--panel2); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 4px; text-align: center;
  cursor: grab; user-select: none;
}
.pal-item:active { cursor: grabbing; }
.pal-item.selected { outline: 2px solid var(--accent); }
.pal-item img {
  width: 52px; height: 52px; object-fit: contain;
  image-rendering: auto; display: block; margin: 0 auto 4px;
  background: #0c1016; border-radius: 4px;
}
.pal-item .name {
  font-size: 10px; color: var(--muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pal-item .dim {
  font-size: 9px; color: #6a7a8a;
}
.stage-wrap {
  position: relative; overflow: auto; background:
    radial-gradient(ellipse at 30% 20%, #15202c 0%, #0b1016 55%);
  display: flex; align-items: flex-start; justify-content: flex-start;
}
#stage {
  position: relative; margin: 24px;
  background: var(--cell);
  box-shadow: 0 0 0 1px var(--border), 0 12px 40px #0008;
  transform-origin: 0 0;
}
.grid-canvas { position: absolute; inset: 0; pointer-events: none; }
.markers { position: absolute; inset: 0; }
.marker {
  position: absolute;
  cursor: grab; z-index: 2;
  display: flex; flex-direction: column; align-items: center;
  filter: drop-shadow(0 3px 4px #000a);
  pointer-events: auto;
}
.marker.selected { z-index: 50 !important; }
.marker.selected .frame {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
.marker .frame {
  border-radius: 4px;
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  border: none;
  overflow: visible;
}
.marker img {
  object-fit: contain;
  pointer-events: none;
  image-rendering: auto;
  display: block;
}
.marker .tag {
  font-size: 10px; margin-top: 2px; padding: 1px 5px;
  background: #000c; border-radius: 4px; color: #ffe0b0;
  max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  pointer-events: none;
}
.marker.appro {
  width: 14px; height: 14px; margin-left: -7px; margin-top: -7px;
  border-radius: 50%; background: #5cb8e8aa; border: 2px solid #9fdfff;
  z-index: 1; cursor: default;
}
.cell-hover {
  position: absolute; pointer-events: none; z-index: 1;
  background: #e8a35c33;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  border: none;
  outline: none;
  box-shadow: inset 0 0 0 2px var(--snap);
}
.item-row {
  display: flex; gap: 8px; align-items: center;
  padding: 6px 8px; border-radius: 6px; cursor: pointer;
  border: 1px solid transparent;
}
.item-row:hover { background: var(--panel2); }
.item-row.selected { border-color: var(--accent); background: #2a2418; }
.item-row img { width: 28px; height: 28px; object-fit: contain; background: #0c1016; border-radius: 4px; }
.item-row .meta { flex: 1; min-width: 0; }
.item-row .meta .t { font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item-row .meta .s { font-size: 10px; color: var(--muted); }
.status {
  padding: 8px 12px; font-size: 11px; color: var(--muted);
  border-top: 1px solid var(--border);
}
.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 8px; }
.field label { font-size: 11px; color: var(--muted); }
.field input, .field select { width: 100%; }
.detail { padding: 10px; border-top: 1px solid var(--border); max-height: 42%; overflow: auto; }
.drop-hint {
  position: absolute; inset: 0; display: none; align-items: center; justify-content: center;
  background: #e8a35c22; border: 3px dashed var(--accent); z-index: 20;
  font-size: 18px; color: var(--accent); pointer-events: none;
}
.stage-wrap.drag-over .drop-hint { display: flex; }
.upload-zone {
  margin: 8px 10px; padding: 10px; border: 1px dashed var(--border);
  border-radius: 8px; text-align: center; font-size: 12px; color: var(--muted);
  cursor: pointer;
}
.upload-zone:hover { border-color: var(--accent); color: var(--accent); }
.hidden-file { display: none; }
.help-panel {
  display: none;
  position: sticky; top: 12px; left: 12px; z-index: 30;
  align-self: flex-start;
  max-width: 420px; margin: 12px;
  padding: 14px 16px;
  background: #1a222cee; border: 1px solid var(--accent);
  border-radius: 10px;
  box-shadow: 0 8px 28px #000a;
  font-size: 12px; line-height: 1.55;
  color: var(--text);
}
.help-panel.open { display: block; position: absolute; }
.help-panel h3 { margin: 0 0 8px; font-size: 14px; color: #ffd9a8; }
.help-panel ol { margin: 0; padding-left: 18px; }
.help-panel li { margin-bottom: 6px; }
.help-panel code {
  background: #0c1016; padding: 1px 5px; border-radius: 4px; font-size: 11px;
}
.help-panel .muted { color: var(--muted); margin: 8px 0 0; }

.scale-field .scale-row {
  display: flex; gap: 8px; align-items: center;
}
.scale-field .scale-row input[type="range"] {
  flex: 1; padding: 0; height: 28px; cursor: pointer;
  accent-color: var(--accent);
}
.scale-field .scale-row input[type="number"] {
  width: 72px;
}