/* Palette sampled from the reference tool's own rendered pixels and stylesheet,
   not copied from its code: dark navy header, teal accent, neutral grays. */
:root {
  --color-nav: #2e004b;
  --color-accent: #08979c;
  --color-accent-dark: #07888c;
  --color-accent-tint: #e6f5f5;
  --color-border: #dcdfe6;
  --color-border-light: #e4e7ed;
  --color-text: #303133;
  --color-text-secondary: #606266;
  --color-text-muted: #909399;
  --color-bg-canvas-area: #c4c4c4;
  --color-danger: #f56c6c;
  --color-warning: #e6a23c;
  --color-success: #67c23a;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  font-size: 14px;
}

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Header */
.topnav {
  background: var(--color-nav);
  color: #fff;
  display: flex;
  align-items: center;
  height: 52px;
  padding: 0 20px;
  flex: none;
}

.brand {
  font-family: Cambria, Cochin, Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 700;
  font-size: 21px;
  letter-spacing: 0.02em;
}

.topnav-spacer { flex: 1; }

.topnav-hint {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 16px;
  background: #fff;
  border-bottom: 1px solid var(--color-border-light);
  flex: none;
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-group label {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.toolbar-group select {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 5px 8px;
  font-size: 13px;
  color: var(--color-text);
  background: #fff;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background: var(--color-border-light);
  flex: none;
}

.toolbar-icons { gap: 2px; }

.icon-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: 4px;
  cursor: pointer;
}

.icon-btn svg { width: 18px; height: 18px; }

.icon-btn:hover {
  background: #f5f7fa;
  color: var(--color-accent);
}

.icon-btn.active {
  background: var(--color-accent);
  color: #fff;
}

.dropdown { position: relative; }

.dropdown-menu {
  display: none;
  position: absolute;
  top: 38px;
  left: 0;
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  z-index: 20;
  min-width: 150px;
  overflow: hidden;
}

.dropdown-menu.open { display: block; }

.dropdown-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border: none;
  background: #fff;
  font-size: 13px;
  color: var(--color-text);
  cursor: pointer;
}

.dropdown-menu button:hover { background: #f5f7fa; color: var(--color-accent); }

/* Workspace */
.workspace {
  flex: 1;
  display: flex;
  min-height: 0;
}

.panel {
  width: 220px;
  flex: none;
  background: #fff;
  overflow-y: auto;
  padding: 14px;
}

.panel-left { border-right: 1px solid var(--color-border-light); }
.panel-right { border-left: 1px solid var(--color-border-light); }

.panel-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.empty-hint {
  color: var(--color-text-muted);
  font-size: 13px;
  text-align: center;
  margin-top: 24px;
}

.components-list { display: flex; flex-direction: column; gap: 2px; }

.component-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 7px 8px;
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
  color: var(--color-text-secondary);
}

.component-item:hover { background: #f5f7fa; }

.component-item.selected {
  background: var(--color-accent-tint);
  color: var(--color-accent-dark);
}

.component-item .remove-btn {
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  padding: 2px 4px;
}

.component-item .remove-btn:hover { color: var(--color-danger); }

/* Canvas */
.canvas-area {
  flex: 1;
  background: var(--color-bg-canvas-area);
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 28px;
}

.canvas-holder {
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  flex: none;
}

.canvas-holder svg { display: block; }

/* Attributes panel form */
.field-group { margin-bottom: 14px; }

.field-group label {
  display: block;
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.field-row { display: flex; gap: 8px; }
.field-row .field-group { flex: 1; }

.field-group input[type="text"],
.field-group input[type="number"] {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 6px 8px;
  font-size: 13px;
  color: var(--color-text);
}

.field-group input[type="color"] {
  width: 100%;
  height: 30px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 2px;
  background: #fff;
}

.attr-buttons {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.btn {
  border: none;
  border-radius: 4px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
  color: #fff;
  background: var(--color-text-muted);
}

.btn-primary { background: var(--color-accent); }
.btn-primary:hover { background: var(--color-accent-dark); }

.btn-danger { background: var(--color-danger); }
.btn-danger:hover { background: #f34a4a; }

.btn-block { width: 100%; }

/* Toast */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--color-text);
  color: #fff;
  padding: 10px 16px;
  border-radius: 4px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.toast.show { opacity: 1; }

/* Selection handles on canvas */
.selection-outline {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 1;
  stroke-dasharray: 4 3;
  pointer-events: none;
}

.resize-handle {
  fill: #fff;
  stroke: var(--color-accent);
  stroke-width: 1.5;
  cursor: nwse-resize;
}