/* ---------------- Tool layout ---------------- */
.app{
  display:grid;
  grid-template-columns:1fr 380px 300px;
  grid-template-areas:"stage panel ads";
  min-height:calc(100vh - var(--header-h));
}
@media (max-width:1320px){
  .app{ grid-template-columns:1fr 380px; grid-template-areas:"stage panel" "ads ads"; }
}
@media (max-width:960px){
  .app{ grid-template-columns:1fr; grid-template-areas:"stage" "panel" "ads"; }
}
.stage{ grid-area:stage; }
.panel{ grid-area:panel; }
.ad-rail{ grid-area:ads; }

/* ---------------- Stage ---------------- */
.stage{
  position:relative;
  display:flex;
  flex-direction:column;
  min-height:420px;
  overflow:hidden;
  border-right:1px solid var(--border-soft);
  background:#14151b;
}
@media (max-width:960px){ .stage{border-right:none; border-bottom:1px solid var(--border-soft); min-height:60vh;} }

.stage-topbar{
  position:relative;
  z-index:5;
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:12px;
  padding:16px;
}
.modetabs{
  display:flex;
  gap:2px;
  background:rgba(255,255,255,0.06);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:10px;
  padding:3px;
}
.modetabs button{
  background:none;border:none;
  font-family:var(--mono);
  font-size:12px;
  color:rgba(242,242,239,0.6);
  padding:7px 14px;
  border-radius:7px;
  transition:background .15s, color .15s;
}
.modetabs button.active{ background:rgba(255,255,255,0.14); color:#fff; }
.stage-actions{ display:flex; align-items:center; gap:8px; }
.icon-btn{
  width:34px;height:34px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,0.06);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:9px;
  color:#fff;
}
.icon-btn:hover{background:rgba(255,255,255,0.14);}

.preview-wrap{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:0;
  padding:20px;
}
.grid-wrap{
  position:relative;
  display:inline-block;
}
#cellsGrid{
  display:grid;
  width:min(760px, 100%);
  height:min(440px, 60vh);
}
.grid-cell{
  background:rgba(255,255,255,0.05);
  border:1px dashed rgba(255,255,255,0.14);
  border-radius:6px;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);
  font-size:10.5px;
  color:rgba(242,242,239,0.35);
  min-width:0;min-height:0;
  transition:background .1s ease;
}
.grid-cell.painting{
  background:rgba(87,216,201,0.28);
  border-color:rgba(87,216,201,0.6);
}
.grid-layer.overlay{
  position:absolute;
  inset:0;
  width:100%;height:100%;
  display:grid;
  pointer-events:none;
}
.area-block{
  position:relative;
  border-radius:8px;
  display:flex;align-items:center;justify-content:space-between;
  padding:8px 10px;
  pointer-events:auto;
  cursor:pointer;
  box-shadow:0 4px 14px rgba(0,0,0,.25);
}
.area-block.selected{ outline:2px solid #fff; outline-offset:-2px; }
.area-block .area-name{
  font-family:var(--mono);
  font-size:12px;
  font-weight:600;
  color:#0c0d17;
  outline:none;
  cursor:text;
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.area-block .area-rm{
  background:rgba(12,13,17,0.18);
  border:none;
  color:#0c0d17;
  width:18px;height:18px;
  border-radius:50%;
  font-size:13px;line-height:1;
  flex:0 0 auto;
}
.area-block .area-rm:hover{ background:rgba(12,13,17,0.32); }

.handles-layer{
  position:absolute;
  inset:0;
  width:100%;height:100%;
  pointer-events:none;
}
.grid-handle{
  position:absolute;
  pointer-events:auto;
  background:transparent;
}
.grid-handle-col{
  top:0;
  width:10px;
  margin-left:-5px;
  cursor:col-resize;
}
.grid-handle-row{
  left:0;
  height:10px;
  margin-top:-5px;
  cursor:row-resize;
}
.grid-handle::after{
  content:'';
  position:absolute;
  background:rgba(255,255,255,0.18);
  border-radius:999px;
  transition:background .15s;
}
.grid-handle-col::after{ left:4px; top:0; bottom:0; width:2px; }
.grid-handle-row::after{ top:4px; left:0; right:0; height:2px; }
.grid-handle:hover::after, .grid-handle:active::after{ background:var(--accent); }

.stage-hint{
  position:relative;
  z-index:5;
  text-align:center;
  font-family:var(--mono);
  font-size:11px;
  color:rgba(242,242,239,0.5);
  padding:0 16px 16px;
}

/* ---------------- Control panel ---------------- */
.panel{
  background:var(--surface);
  border-left:1px solid var(--border-soft);
  padding:22px 20px 40px;
  overflow-y:auto;
  max-height:calc(100vh - var(--header-h));
}
@media (max-width:960px){ .panel{border-left:none; max-height:none;} }
.panel h2{ font-family:var(--display); font-size:18px; font-weight:600; margin:0 0 4px; }
.panel .sub{ font-size:12.5px; color:var(--text-faint); margin:0 0 22px; line-height:1.5; }

/* ---------------- Track list ---------------- */
.track-list{ display:flex; flex-direction:column; gap:6px; }
.track-row{
  display:flex; align-items:center; gap:6px;
  background:var(--surface-2);
  border:1px solid var(--border-soft);
  border-radius:8px;
  padding:6px 8px;
  min-width:0;
}
.track-index{
  font-family:var(--mono); font-size:11px; color:var(--text-faint);
  width:14px; flex:0 0 auto;
}
.track-unit{ flex:0 0 68px; width:68px; min-width:0; }
.track-size{ flex:1 1 auto; width:auto; min-width:0; }
.track-size-placeholder{ flex:1 1 auto; min-width:0; }
.track-row .rm{
  margin-left:auto;
  flex:0 0 auto;
  background:none;border:none;color:var(--text-faint);
  font-size:15px;line-height:1;padding:2px 4px;
}
.track-row .rm:hover{ color:#f0729b; }

select, input[type=number]{
  background:var(--surface);
  border:1px solid var(--border-soft);
  border-radius:6px;
  color:var(--text);
  font-family:var(--mono);
  font-size:11.5px;
  padding:5px 6px;
}
select{ width:100%; }

/* ---------------- Gap link button ---------------- */
.btn.active{ background:var(--accent-soft); border-color:var(--accent-dim); color:var(--accent-dim); }

/* ---------------- Area list (reused pattern) ---------------- */
.layer-list{ display:flex; flex-direction:column; gap:8px; }
.layer-row{
  display:flex;align-items:center;gap:10px;
  background:var(--surface-2);
  border:1px solid var(--border-soft);
  border-radius:9px;
  padding:8px 10px;
  cursor:pointer;
}
.layer-row.selected{ border-color:var(--accent-dim); box-shadow:0 0 0 1px var(--accent-dim); }
.layer-swatch{
  flex:0 0 auto; width:26px;height:26px; border-radius:7px;
  border:1px solid var(--border-soft);
}
.layer-summary{
  flex:1; min-width:0;
  font-family:var(--mono); font-size:11.5px; color:var(--text-dim);
  display:flex; flex-direction:column; gap:2px;
}
.layer-summary .layer-color{ font-size:10.5px; color:var(--text-faint); }
.layer-row .rm{
  background:none;border:none;color:var(--text-faint);
  font-size:16px;line-height:1;padding:2px 4px;
}
.layer-row .rm:hover{ color:#f0729b; }
.hint-inline{
  font-size:11.5px;
  color:var(--text-faint);
  line-height:1.5;
  margin:10px 0 0;
}

/* ---------------- Presets ---------------- */
.preset-grid{ display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.preset-btn{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  min-width:0;
  background:var(--surface-2);
  border:1px solid var(--border-soft);
  border-radius:11px;
  padding:10px 8px;
}
.preset-btn:hover{ border-color:var(--border); }
.preset-btn em{ font-style:normal; font-size:11px; color:var(--text-dim); text-align:center; }
.mini-grid{
  display:grid;
  width:100%;height:56px;
  gap:3px;
}
.mini-grid i{ display:block; border-radius:3px; }

/* ---------------- Export ---------------- */
.code-box{
  position:relative;
  background:var(--surface-2);
  border:1px solid var(--border-soft);
  border-radius:9px;
  padding:12px;
}
.code-box pre{
  margin:0;
  font-family:var(--mono);
  font-size:11.5px;
  line-height:1.6;
  white-space:pre-wrap;
  word-break:break-all;
  max-height:200px;
  overflow-y:auto;
}
.code-box .copy{
  position:absolute;top:8px;right:8px;
  font-family:var(--mono);
  font-size:10.5px;
  padding:4px 8px;
  background:var(--surface-3);
  border:1px solid var(--border);
  border-radius:6px;
  color:var(--text-dim);
}
.code-box .copy:hover{ color:var(--text); }
.code-tabs{ display:flex; gap:6px; margin-bottom:8px; flex-wrap:wrap; }
.code-tabs button{
  font-size:11px;font-family:var(--mono);
  background:none;border:1px solid var(--border-soft);
  color:var(--text-faint);
  padding:4px 9px;border-radius:6px;
}
.code-tabs button.active{ color:var(--accent-dim); border-color:var(--accent-dim); }