:root {
  --bg: #f8f9fb;
  --panel-bg: #ffffff;
  --border: #dcdfe6;
  --primary: #4f8ef7;
  --primary-weak: #e8f0fe;
  --text: #2b2f36;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Microsoft Yahei", "Noto Sans", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
}
.app-header h1 { font-size: 18px; margin: 0; }
.app-header .actions button {
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  border-radius: 6px;
  cursor: pointer;
}
.app-header .actions button:hover {
  border-color: var(--primary);
}

.app-main { display: grid; grid-template-columns: 360px 1fr; height: calc(100vh - 96px); }

.palette {
  padding: 12px;
  border-right: 1px solid var(--border);
  background: var(--panel-bg);
  overflow: auto;
}
.palette h2 { margin: 0 0 8px 0; font-size: 14px; color: #667; }
.palette-items { display: grid; gap: 8px; }
.palette-item {
  padding: 8px 10px;
  border: 1px dashed var(--border);
  background: var(--primary-weak);
  color: var(--primary);
  border-radius: 6px;
  cursor: grab;
  user-select: none;
}
.palette-item:active { cursor: grabbing; }

.canvas-wrap { position: relative; }
.canvas-container {
  position: relative;
  margin: 12px;
  height: calc(100% - 24px);
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
}

svg#canvas { display: block; width: 100%; height: 100%; }

.selection-rect { fill: rgba(79, 142, 247, 0.08); stroke: var(--primary); stroke-dasharray: 4 2; }
.handle {
  fill: #fff; stroke: var(--primary);
  vector-effect: non-scaling-stroke;
}

.text-editor {
  position: absolute;
  display: none;
  padding: 4px 6px;
  border: 1px solid var(--primary);
  box-shadow: 0 2px 6px rgba(0,0,0,.08);
  border-radius: 6px;
  outline: none;
  font-size: 16px;
  z-index: 10;
}

.app-footer {
  height: 48px;
  display: flex; align-items: center; padding: 0 16px;
  border-top: 1px solid var(--border);
  background: var(--panel-bg);
  color: #667;
}

/* 代码面板 */
.code-panel {
  margin-top: 12px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.code-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border-bottom: 1px solid var(--border);
}
.code-toolbar .spacer { flex: 1; }
.code-toolbar button {
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  border-radius: 6px;
  cursor: pointer;
}
.code-toolbar button:hover { border-color: var(--primary); }
.code-input {
  width: 100%;
  min-height: 220px;
  border: none;
  outline: none;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  padding: 8px;
  background: #fafafa;
}
.code-status {
  padding: 6px 8px;
  font-size: 12px;
  color: #667;
  border-top: 1px dashed var(--border);
}
.color-panel {
  margin-top: 12px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-bg);
}
.color-panel h2 { margin: 0 0 8px 0; font-size: 14px; color: #667; }
.color-target { display: flex; gap: 12px; margin-bottom: 8px; }
.swatches { display: grid; grid-template-columns: repeat(11, 1fr); gap: 6px; margin-bottom: 8px; }
.swatch {
  width: 22px; height: 22px; border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--c);
  cursor: pointer;
}
.swatch:hover { border-color: var(--primary); }
.color-pickers { display: grid; grid-template-columns: 1fr; gap: 8px; }
.color-pickers label { display: flex; align-items: center; justify-content: space-between; }
.color-status { margin-top: 8px; font-size: 12px; color: #667; }