.layout-rail {
  display: grid;
  grid-template-columns: 260px 52px 200px 1fr 260px;
}

.icon-rail {
  background: #eef2ff;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px;
}

.rail-btn {
  width: 38px;
  height: 38px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  font-size: 18px;
}

.rail-btn:hover,
.rail-btn.active {
  background: var(--panel);
  border-color: var(--border);
}

.rail-flyout {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 12px 10px;
  overflow: auto;
}

.rail-flyout.hidden { display: none; }

.flyout-title {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.editor-mock { flex: 1; min-height: 320px; }