/* ============ 全局 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --topbar-h: 44px;
  --ribbon-h: 42px;
  --statusbar-h: 26px;
  --sidebar-w: 196px;
  --drawer-w: 290px;
  --border: #d9d9d9;
  --bg-dark: #2b2b2b;
  --accent: #e2725b;      /* 钩针主题暖色 */
  --accent-light: #fdf0ec;
  --accent-hover: #d15f48;
}

html, body {
  height: 100%;
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 13px;
  overflow: hidden;
  user-select: none;
}

/* ============ 顶部导航栏 ============ */
#topbar {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg-dark);
  color: #fff;
  z-index: 10;
}

.brand { font-size: 15px; font-weight: 600; letter-spacing: 0.5px; }

.top-actions { display: flex; align-items: center; gap: 8px; }
.top-actions .divider { width: 1px; height: 18px; background: #555; }

#topbar button {
  padding: 5px 12px;
  border: 1px solid #555;
  border-radius: 4px;
  background: transparent;
  color: #fff;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s;
}
#topbar button:hover:not(:disabled) { background: #3d3d3d; }
#topbar button:disabled { opacity: 0.35; cursor: not-allowed; }

/* ============ 顶部导航栏下方平铺工具栏 (Ribbon Bar) ============ */
#ribbon-bar {
  height: var(--ribbon-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  background: #ffffff;
  border-bottom: 1px solid #e2ded7;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
  z-index: 9;
}

.ribbon-left {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ribbon-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ribbon-divider {
  width: 1px;
  height: 20px;
  background: #e0ddd8;
  margin: 0 4px;
}

.ribbon-tool-btn, .ribbon-action-btn {
  width: 32px;
  height: 32px;
  border: 1px solid #e0ddd8;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #444;
  transition: all 0.12s;
}
.ribbon-tool-btn:hover:not(:disabled), .ribbon-action-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: #fdfaf7;
  color: var(--accent);
}
.ribbon-tool-btn.active {
  background: var(--accent-light);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-weight: bold;
}
.ribbon-tool-btn:disabled, .ribbon-action-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.ribbon-action-btn {
  width: auto;
  min-width: 32px;
  padding: 0 8px;
  font-size: 12px;
}
#btn-zoom-100 {
  min-width: 48px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.ribbon-btn-struct {
  padding: 6px 12px;
  border: 1px solid #e2725b;
  border-radius: 4px;
  background: #e2725b;
  color: #ffffff;
  font-weight: 500;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
}
.ribbon-btn-struct:hover {
  background: var(--accent-hover);
}

.ribbon-btn-style {
  padding: 6px 12px;
  border: 1px solid #d0ccc5;
  border-radius: 4px;
  background: #f5f2ed;
  color: #333333;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s;
}
.ribbon-btn-style:hover, .ribbon-btn-style.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.color-picker-wrapper {
  display: flex;
  align-items: center;
  position: relative;
}
.color-picker-wrapper input[type="color"] {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid #d0ccc5;
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
}

/* ============ 主区域 ============ */
#main {
  display: flex;
  height: calc(100% - var(--topbar-h) - var(--ribbon-h) - var(--statusbar-h));
  position: relative;
  overflow: hidden;
}

/* ---- 左侧针法库 / 图解库 边栏 ---- */
#library-sidebar {
  width: var(--sidebar-w);
  min-width: 0;
  max-width: 600px;
  background: #f7f5f2;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  user-select: none;
  z-index: 5;
  overflow: hidden;
}

.lib-tab-bar {
  display: flex;
  background: #eeeae3;
  border-bottom: 1px solid #d9d4cc;
  padding: 4px 6px 0;
  gap: 4px;
  overflow: hidden;
  white-space: nowrap;
}

.lib-tab-btn {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 6px 4px;
  border: none;
  background: transparent;
  font-size: 12px;
  font-weight: 500;
  color: #777;
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  text-align: center;
  transition: all 0.12s;
}
.lib-tab-btn:hover {
  color: #2b2b2b;
}
.lib-tab-btn.active {
  background: #f7f5f2;
  color: var(--accent);
  font-weight: bold;
  box-shadow: 0 -1px 2px rgba(0,0,0,0.04);
}

.lib-tab-content {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding: 6px 4px 16px;
}
.lib-tab-content.active {
  display: block;
}

.lib-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 12px;
  color: #999;
  text-align: center;
}
.lib-empty-state .empty-icon {
  font-size: 32px;
  margin-bottom: 8px;
}
.lib-empty-state .empty-text {
  font-size: 14px;
  font-weight: bold;
  color: #666;
  margin-bottom: 4px;
}
.lib-empty-state .empty-sub {
  font-size: 11px;
  color: #aaa;
}

/* ============ 结构库卡片样式 ============ */
.struct-lib-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.struct-group-title {
  font-size: 11px;
  font-weight: 600;
  color: #777;
  padding: 8px 6px 4px;
  border-bottom: 1px solid #e6e2da;
}

.struct-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
  gap: 8px;
  padding: 4px 4px 8px;
}

.struct-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #e0ddd8;
  border-radius: 6px;
  padding: 8px 4px 6px;
  cursor: grab;
  user-select: none;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.struct-card:hover {
  border-color: #4a88e8;
  background: #f8fbff;
  box-shadow: 0 2px 6px rgba(74, 136, 232, 0.15);
  transform: translateY(-1px);
}

.struct-card.active {
  border-color: #4a88e8;
  background: #edf5ff;
  box-shadow: 0 0 0 2px rgba(74, 136, 232, 0.25);
}

.struct-card:active {
  cursor: grabbing;
}

.struct-card.dragging {
  opacity: 0.4;
  border-style: dashed;
  border-color: #4a88e8;
}

.struct-icon-box {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 4px;
}

.struct-icon {
  width: 32px;
  height: 32px;
}

.struct-name {
  font-size: 11px;
  color: #444;
  text-align: center;
  white-space: nowrap;
}

.tool-group-label {
  font-size: 11px;
  color: #888;
  text-align: left;
  padding-left: 2px;
  margin: 10px 0 4px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 动态针法网格：图标固定 42px，按可用宽度自动排布列数 */
.tool-group {
  display: grid;
  grid-template-columns: repeat(auto-fill, 42px);
  gap: 4px;
  padding: 0 2px;
  justify-content: flex-start;
}

.tool-btn {
  width: 42px;
  height: 42px;
  aspect-ratio: 1;
  flex-shrink: 0;
  box-sizing: border-box;
  border: 1px solid #e0ddd8;
  border-radius: 5px;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.1s;
  color: #333;
}
.tool-btn:hover:not(:disabled) { border-color: var(--accent); }
.tool-btn.active {
  background: var(--accent-light);
  border: 2px solid var(--accent);
  font-weight: bold;
}
.tool-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.tool-btn.collapsed-btn { display: none !important; }

.tool-group-toggle {
  grid-column: 1 / -1;
  border: 1px dashed #d0ccc5;
  border-radius: 4px;
  background: #f0ede8;
  color: #777;
  font-size: 11px;
  padding: 3px 0;
  cursor: pointer;
  text-align: center;
  margin-top: 2px;
  transition: all 0.15s;
  user-select: none;
}
.tool-group-toggle:hover {
  background: #e5e0d8;
  color: #2b2b2b;
  border-color: var(--accent);
}

/* ---- 边栏拖拽手柄 ---- */
#sidebar-resizer {
  width: 5px;
  cursor: col-resize;
  background: transparent;
  transition: background 0.15s;
  flex-shrink: 0;
  z-index: 10;
  margin-left: -2px;
  margin-right: -3px;
}
#sidebar-resizer:hover, #sidebar-resizer.resizing {
  background: var(--accent);
}

/* ---- 画布区 ---- */
#canvas-wrap {
  flex: 1;
  position: relative;
  background: #eae7e0;
  overflow: hidden;
}

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

/* 符号层、引导层与参考底图层穿透指针：交互全部基于坐标 hitTest，
   且 render 重建子元素时保持事件 target 稳定（否则双击无法合成 dblclick） */
#symbols-layer, #guides-layer, #ref-image-layer { pointer-events: none; }

/* ---- 画布文件拖拽蒙层（三期） ---- */
#drag-overlay {
  position: absolute;
  inset: 0;
  background: rgba(240, 245, 255, 0.85);
  backdrop-filter: blur(2px);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
#drag-overlay.hidden { display: none; }

.drag-overlay-box {
  padding: 30px 48px;
  border: 2px dashed #4a90e2;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 8px 24px rgba(74, 144, 226, 0.15);
  text-align: center;
}

.drag-overlay-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

.drag-overlay-text {
  font-size: 16px;
  font-weight: 600;
  color: #2c3e50;
}

#page-paper-rect {
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.12));
}

#hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(43, 43, 43, 0.8);
  color: #fff;
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 16px;
  pointer-events: none;
  z-index: 8;
}

/* ---- 标注双击编辑输入框 ---- */
#label-editor {
  position: absolute;
  width: 120px;
  padding: 4px 8px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  z-index: 20;
  font-size: 13px;
}
#label-editor.hidden { display: none; }

/* ---- 右侧样式设置抽屉 (Style Drawer) ---- */
#style-drawer {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--drawer-w);
  height: 100%;
  background: #ffffff;
  border-left: 1px solid var(--border);
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.08);
  z-index: 25;
  display: flex;
  flex-direction: column;
  transition: transform 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}
#style-drawer.drawer-closed {
  transform: translateX(100%);
  pointer-events: none;
}

.drawer-header {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #e8e5df;
  padding: 0 12px;
  background: #faf8f5;
}

.drawer-tabs {
  display: flex;
  gap: 4px;
}

.drawer-tab-btn {
  padding: 5px 10px;
  border: none;
  background: transparent;
  font-size: 12px;
  font-weight: 500;
  color: #666;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
}
.drawer-tab-btn:hover {
  color: var(--accent);
}
.drawer-tab-btn.active {
  font-weight: bold;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

.drawer-close-btn {
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  font-size: 14px;
  color: #888;
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.drawer-close-btn:hover {
  background: #eee;
  color: #333;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.drawer-tab-panel {
  display: none;
}
.drawer-tab-panel.active {
  display: block;
}

.drawer-field {
  margin-bottom: 16px;
}

.drawer-field-label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: #555;
  margin-bottom: 6px;
}

.drawer-color-picker {
  display: flex;
  align-items: center;
  gap: 10px;
}
.drawer-color-picker input[type="color"] {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid #d0ccc5;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}
#bg-color-val {
  font-size: 12px;
  color: #666;
  font-family: monospace;
}

.drawer-select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid #d0ccc5;
  border-radius: 5px;
  background: #fff;
  font-size: 12px;
  color: #333;
  outline: none;
  cursor: pointer;
}
.drawer-select:focus {
  border-color: var(--accent);
}

.bg-custom-size-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}

.size-input-box {
  flex: 1;
  display: flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid #d0ccc5;
  border-radius: 6px;
  padding: 4px 8px;
  min-width: 0;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.size-input-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(201, 114, 59, 0.15);
}

.size-num-input {
  flex: 1;
  width: 100%;
  min-width: 0;
  border: none;
  background: transparent;
  font-size: 13px;
  color: #333;
  outline: none;
  padding: 0;
  text-align: left;
  -moz-appearance: textfield;
}
.size-num-input::-webkit-outer-spin-button,
.size-num-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.size-unit {
  font-size: 12px;
  color: #888;
  margin-right: 6px;
  user-select: none;
}

.size-tag {
  font-size: 12px;
  font-weight: bold;
  color: #555;
  user-select: none;
}

.btn-swap-size {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #d0ccc5;
  border-radius: 6px;
  color: #555;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: all 0.15s;
}
.btn-swap-size:hover {
  background: #f5f3ef;
  border-color: var(--accent);
  color: var(--accent);
}
.btn-swap-size:active {
  transform: scale(0.95);
}

.drawer-field.checkbox-field {
  margin-bottom: 12px;
}

.drawer-checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #333;
  cursor: pointer;
  user-select: none;
}
.drawer-checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.drawer-field-hint {
  font-size: 11px;
  color: #999;
  margin-top: 4px;
  margin-left: 22px;
  line-height: 1.4;
}

.drawer-section-title {
  font-size: 13px;
  font-weight: bold;
  color: var(--accent);
  margin-bottom: 14px;
  padding-bottom: 4px;
  border-bottom: 1px dashed #e8e4dc;
}

/* ---- 参考底图控制卡片（三期） ---- */
#drawer-ref-image-card {
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #faf9f7;
}
#drawer-ref-image-card.hidden { display: none; }

.drawer-range {
  accent-color: var(--accent);
  cursor: pointer;
}

.drawer-btn-danger {
  width: 100%;
  padding: 6px 12px;
  background: #fee2e2;
  color: #dc2626;
  border: 1px solid #fca5a5;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: background 0.15s;
}
.drawer-btn-danger:hover {
  background: #fecaca;
}

.drawer-btn-upload {
  display: block;
  text-align: center;
  padding: 7px 12px;
  background: #fff;
  color: #374151;
  border: 1px dashed var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}
.drawer-btn-upload:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: #faf8f5;
}

.drawer-grid-inputs {
  display: flex;
  gap: 8px;
}

.stepper-input-box {
  display: flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid #d0ccc5;
  border-radius: 6px;
  padding: 2px 6px;
  flex: 1;
  min-width: 0;
  transition: border-color 0.15s;
}
.stepper-input-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(201, 114, 59, 0.15);
}

.stepper-tag {
  font-size: 11px;
  font-weight: bold;
  color: #888;
  margin-right: 4px;
  user-select: none;
}

.stepper-num-input {
  flex: 1;
  width: 100%;
  min-width: 0;
  border: none;
  background: transparent;
  font-size: 12px;
  color: #333;
  outline: none;
  padding: 2px 0;
  -moz-appearance: textfield;
}
.stepper-num-input::-webkit-outer-spin-button,
.stepper-num-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.stepper-unit {
  font-size: 11px;
  color: #999;
  margin: 0 4px;
  user-select: none;
}

.stepper-btns {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.stepper-btn {
  border: none;
  background: #f0ede6;
  color: #666;
  font-size: 8px;
  line-height: 8px;
  width: 14px;
  height: 10px;
  padding: 0;
  cursor: pointer;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stepper-btn:hover {
  background: var(--accent);
  color: #fff;
}

.drawer-flex-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.drawer-icon-btn {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #d0ccc5;
  border-radius: 6px;
  color: #555;
  cursor: pointer;
  transition: all 0.15s;
}
.drawer-icon-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: #fdfaf6;
}

.drawer-btn-group {
  display: flex;
  border: 1px solid #d0ccc5;
  border-radius: 6px;
  overflow: hidden;
}

.drawer-group-btn {
  flex: 1;
  padding: 6px 12px;
  border: none;
  background: #fff;
  font-size: 12px;
  color: #666;
  cursor: pointer;
  transition: all 0.15s;
}
.drawer-group-btn.active {
  background: var(--accent);
  color: #fff;
  font-weight: bold;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.drawer-slider {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.slider-val {
  font-size: 12px;
  color: #666;
  min-width: 40px;
  text-align: right;
  font-family: monospace;
}

.color-presets-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-top: 10px;
}

.color-preset-swatch {
  height: 22px;
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.color-preset-swatch:hover {
  transform: scale(1.1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.props-title {
  font-weight: bold;
  margin-bottom: 8px;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}

.props-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 13px;
}

.props-row input[type="text"] { width: 110px; padding: 3px 6px; }
.props-row input[type="color"] { width: 30px; height: 24px; border: none; }

.props-actions { display: flex; gap: 8px; }
.props-actions button {
  flex: 1;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
}
.props-actions button:hover { background: #f5f5f5; }

/* ---- 圆形结构设置 / 方形画布设置 / 路径结构设置面板 ---- */
#circle-panel, #square-panel, #path-panel {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 280px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  padding: 12px;
  z-index: 10;
}

#circle-panel.hidden, #square-panel.hidden, #path-panel.hidden { display: none; }

/* 两面板同时显示（多块混合）时纵向错开，避免重叠遮挡 */
#circle-panel:not(.hidden) ~ #square-panel { top: 280px; }

/* 面板本体不拦截画布点击：hover 展开由 app.js 坐标判定管理，
   仅控件的 pointer-events:auto（标题/按钮/输入/选择） */
#circle-panel, #square-panel, #path-panel { pointer-events: none; }
#circle-panel .props-title, #square-panel .props-title, #path-panel .props-title,
#circle-panel select, #circle-panel input, #circle-panel button, #circle-panel label,
#square-panel select, #square-panel input, #square-panel button, #square-panel label,
#path-panel select, #path-panel input, #path-panel button, #path-panel label { pointer-events: auto; }
#circle-panel .circle-body, #square-panel .square-body, #path-panel .path-body { pointer-events: none; }
#circle-panel .circle-body select, #circle-panel .circle-body input, #circle-panel .circle-body button,
#square-panel .square-body select, #square-panel .square-body input, #square-panel .square-body button,
#path-panel .path-body select, #path-panel .path-body input, #path-panel .path-body button, #path-panel .path-body label { pointer-events: auto; }

/* 默认收起；展开状态由 app.js 按“鼠标是否在面板包围盒内”控制（避免 hover 缝隙闪收） */
#circle-panel .circle-hint, #square-panel .circle-hint, #path-panel .circle-hint { font-size: 11px; color: #999; font-weight: normal; margin-left: 6px; }
#circle-panel .circle-body, #square-panel .square-body, #path-panel .path-body { display: none; }
#square-panel .modal-row input[type="number"] { width: 56px; padding: 3px 6px; }

/* 结构管理行 */
.struct-tools { margin-top: 8px; display: flex; flex-direction: column; gap: 6px; font-size: 12px; }
.struct-tools select { padding: 3px 4px; }
.struct-offset { display: flex; align-items: center; gap: 4px; font-size: 12px; }
.struct-offset input[type="number"] { width: 52px; padding: 3px 4px; }
.struct-offset button { padding: 2px 7px; border: 1px solid var(--border); border-radius: 4px; background: #fff; cursor: pointer; }

/* 添加结构弹卡 */
#struct-add-pop {
  position: fixed;
  width: 190px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
  padding: 10px;
  z-index: 30;
}
#struct-add-pop.hidden { display: none; }
#topbar #btn-struct-add { padding: 6px 12px; font-size: 13px; }
#struct-add-list button {
  display: block;
  width: 100%;
  margin: 3px 0;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  text-align: left;
  font-size: 13px;
}
#struct-add-list button:hover { background: var(--accent-light); border-color: var(--accent); }

#arrow-panel {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 190px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  padding: 12px;
  z-index: 13;
}
#arrow-panel.hidden { display: none; }
#arrow-panel .arrow-body { display: none; }
#arrow-panel:has(:hover) .arrow-body { display: block; }

/* 工具样式下拉（pen/arrow）：贴合按钮宽度、仅图标 */
#tool-drop {
  position: fixed;
  width: 34px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  padding: 2px;
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
#tool-drop.hidden { display: none; }
#tool-drop button {
  display: block;
  width: 100%;
  border: 1px solid transparent;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  padding: 2px 0;
  text-align: center;
}
#tool-drop button:hover, #tool-drop button.sel { background: var(--accent-light); border-color: var(--accent); }

/* 结构块 chips */
#struct-chips {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 15;
}
#struct-chips.hidden { display: none; }
.struct-chip {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  font-size: 12px;
  color: #555;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.struct-chip.active { border-color: var(--accent); color: var(--accent); background: var(--accent-light); font-weight: bold; }

/* 选中结构引导高亮 */
#guides-layer .structure-guides.active .grid-step { filter: brightness(1.6); }
#guides-layer .structure-guides.active .ring-guide { stroke: #e2725b; }
#guides-layer .structure-guides.active .struct-boundary { stroke: #e2725b; }

/* 划线结构非选中状态下隐藏端点与控制手柄，仅显示线条 */
#guides-layer .structure-guides:not(.active) .line-ctrl-p0,
#guides-layer .structure-guides:not(.active) .line-ctrl-p1,
#guides-layer .structure-guides:not(.active) .line-ctrl-mid,
#guides-layer .structure-guides:not(.active) .line-ctrl-curve,
#guides-layer .structure-guides:not(.active) .line-ctrl-handle-line {
  display: none !important;
}

.circle-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 13px;
}

#ring-add {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 12px;
}
#ring-add:hover { background: #f5f5f5; }

.ring-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  font-size: 13px;
}

.ring-name { flex: 1; font-size: 12px; }
.ring-shape-select { width: 48px; padding: 3px 4px; font-size: 12px; }
.ring-points-select { width: 76px; padding: 3px 4px; font-size: 12px; }
.ring-points-input { width: 52px; padding: 3px 6px; }

.ring-del {
  width: 24px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
}
.ring-del:hover:not(:disabled) { background: #f5f5f5; border-color: var(--accent); }
.ring-del:disabled { opacity: 0.35; cursor: not-allowed; }

/* ============ 模态框（保存/打开/导出） ============ */
#modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}
#modal-mask.hidden { display: none; }

.modal-card {
  width: 340px;
  max-height: 70vh;
  overflow-y: auto;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  padding: 16px;
}
.modal-card.hidden { display: none; }

.modal-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 13px;
}
.modal-row input[type="text"] { flex: 1; padding: 5px 8px; }
.modal-row label { display: flex; align-items: center; gap: 4px; }

/* 打开列表 */
.open-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 4px;
  border-bottom: 1px solid #f0ede8;
  font-size: 13px;
}
.open-row .open-info { flex: 1; min-width: 0; }
.open-row .open-name { font-weight: bold; display: block; }
.open-row .open-meta { color: #999; font-size: 11px; }
.open-row button {
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 12px;
}
.open-row button:hover { background: #f5f5f5; }
.open-row .open-del:hover { border-color: var(--accent); }
.open-row .open-rename-input { flex: 1; padding: 3px 6px; }
.open-empty { color: #999; font-size: 13px; padding: 12px 0; text-align: center; }

/* ============ 状态栏 ============ */
#statusbar {
  height: var(--statusbar-h);
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 16px;
  background: var(--bg-dark);
  color: #bbb;
  font-size: 12px;
}

/* ============ 选区旋转手柄与拖动光标 ============ */
.sel-rotate-btn, .sel-rotate-btn * {
  cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Cpath d='M 4.5 6.77 L 6.49 2.76 L 7.25 4.39 A 8.4 8.4 0 1 1 7.25 19.61 L 6.49 21.24 L 4.5 17.23 L 8.86 16.17 L 8.1 17.8 A 6.4 6.4 0 1 0 8.1 6.2 L 8.86 7.83 Z' fill='%231e293b' stroke='%23ffffff' stroke-width='1.5' stroke-linejoin='round'/%3E%3C/svg%3E") 12 12, crosshair !important;
}