/* Dark by default (ROADMAP principle 10); the light theme stays for data-theme="light". */
:root {
  color-scheme: dark;
  --bg: #111418;
  --panel-bg: #181c22;
  --ribbon-bg: #14181e;
  --ribbon-bar-bg: #1b2028;
  --statusbar-bg: #14181e;
  --border: #2b313a;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --hover-bg: #21262d;
  --selected-bg: #1c2d48;
  --selected-border: #58a6ff;
  --splitter-hover: #3b82f6;
  --badge-neutral-bg: #262c36;
  --badge-neutral-fg: #c9d1d9;
  --fail-fg: #fca5a5;
  --fail-bg: #2d1619;
  --fail-border: #dc2626;
  --warn-fg: #fcd34d;
  --warn-bg: #2b2111;
  --warn-border: #d97706;
  --ok-fg: #86efac;
  --ok-bg: #12261a;
  --ok-border: #22c55e;
  --code-bg: #22272e;
  --link: #79b8ff;
  --axis-x: #f87171;
  --axis-y: #4ade80;
  --axis-z: #60a5fa;
  --left-panel-width: 260px;
  --right-panel-width: 340px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel-bg: #ffffff;
  --ribbon-bg: #eef1f5;
  --ribbon-bar-bg: #ffffff;
  --statusbar-bg: #eef1f5;
  --border: #d8dee4;
  --text: #1f2328;
  --text-muted: #59636e;
  --hover-bg: #f0f3f6;
  --selected-bg: #e8f0fe;
  --selected-border: #2563eb;
  --splitter-hover: #2563eb;
  --badge-neutral-bg: #eaeef2;
  --badge-neutral-fg: #32383f;
  --fail-fg: #b91c1c;
  --fail-bg: #fef2f2;
  --fail-border: #f87171;
  --warn-fg: #b45309;
  --warn-bg: #fffbeb;
  --warn-border: #fbbf24;
  --ok-fg: #15803d;
  --ok-bg: #f0fdf4;
  --ok-border: #86efac;
  --code-bg: #eff2f5;
  --link: #0b63ce;
  --axis-x: #dc2626;
  --axis-y: #16a34a;
  --axis-z: #2563eb;
}

a { color: var(--link); }

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

/* Legacy topbar used by model.html */
.topbar {
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.demo-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.demo-bar[hidden],
.badge[hidden] {
  display: none !important;
}

.demo-bar select {
  font: inherit;
  color: var(--text);
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 6px;
}

.demo-bar a {
  color: var(--selected-border);
}

.brand {
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: 0.01em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.brand-logo {
  width: 18px;
  height: 18px;
}

.doc-name {
  font-weight: 600;
  font-size: 13px;
}

.doc-path {
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 460px;
}

.status-text {
  color: var(--text-muted);
  font-size: 12px;
}

/* Inventor-style Ribbon (ADR 0005 Stage 1) */
.ribbon {
  flex-shrink: 0;
  background: var(--ribbon-bg);
  border-bottom: 1px solid var(--border);
  user-select: none;
}

.ribbon-topbar {
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  border-bottom: 1px solid var(--border);
}

.ribbon-topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 100%;
  min-width: 0;
}

.ribbon-topbar .brand {
  margin-right: 4px;
}

/* File Menu */
.file-menu {
  position: relative;
  display: flex;
  align-items: center;
}

.file-menu-btn {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 12px;
  color: var(--text);
  background: var(--selected-bg);
  border: 1px solid var(--selected-border);
  cursor: pointer;
  transition: background-color 0.1s ease;
}

.file-menu-btn::-webkit-details-marker {
  display: none;
}

.file-menu-btn:hover {
  filter: brightness(1.1);
}

.file-menu[open] .file-menu-btn {
  background: var(--selected-border);
  color: var(--bg);
}

.file-menu-btn .caret {
  font-size: 10px;
  opacity: 0.85;
}

.file-menu-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 270px;
  max-width: 340px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 10px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 12.5px;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.menu-item:hover {
  background: var(--hover-bg);
  color: var(--text);
}

.menu-item[hidden],
.menu-divider[hidden],
.menu-note[hidden] {
  display: none !important;
}

.menu-icon {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
  color: var(--text-muted);
}

.file-menu-section {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 5px;
  padding: 4px 8px;
  margin: 0;
}

.menu-section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.file-select {
  width: 100%;
  font: inherit;
  font-size: 12.5px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 6px;
}

.file-doc-list {
  list-style: none;
  margin: 2px 0 0;
  padding: 0;
  max-height: 150px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.file-doc-item {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  color: var(--text);
  font: inherit;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
}

.file-doc-item:hover {
  background: var(--hover-bg);
}

.file-doc-item.active {
  background: var(--selected-bg);
  color: var(--link);
  font-weight: 600;
}

.menu-install-link {
  font-size: 11.5px;
  padding: 2px 2px 0;
}

.menu-divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 4px 0;
}

.menu-note {
  font-size: 11px;
  color: var(--text-muted);
  padding: 2px 10px;
}

/* Ribbon Tabs */
.ribbon-tabs {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 100%;
  margin-left: 4px;
  overflow-x: auto;
}

.ribbon-tab {
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 0;
  color: var(--text-muted);
  font: inherit;
  font-size: 12.5px;
  font-weight: 500;
  padding: 5px 12px 6px;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  cursor: pointer;
  position: relative;
  top: 1px;
  white-space: nowrap;
}

.ribbon-tab:hover {
  color: var(--text);
  background: var(--hover-bg);
}

.ribbon-tab.active {
  color: var(--text);
  font-weight: 600;
  background: var(--ribbon-bar-bg);
  border-color: var(--border);
  border-bottom: 1px solid var(--ribbon-bar-bg);
}

/* Ribbon Command Bar */
.ribbon-bar {
  background: var(--ribbon-bar-bg);
  min-height: 78px;
  padding: 4px 10px 3px;
  overflow-x: auto;
}

.ribbon-panel {
  display: flex;
  align-items: stretch;
  gap: 0;
}

.ribbon-panel[hidden] {
  display: none !important;
}

.ribbon-group {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2px 10px 1px;
  border-right: 1px solid var(--border);
  flex-shrink: 0;
}

.ribbon-group:first-child {
  padding-left: 2px;
}

.ribbon-group:last-child {
  border-right: 0;
}

.ribbon-group-items {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.ribbon-group-title {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  letter-spacing: 0.03em;
  padding-top: 2px;
  line-height: 1.1;
}

.ribbon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
  font: inherit;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.1s ease, border-color 0.1s ease;
}

.ribbon-btn:hover:not(:disabled) {
  background: var(--hover-bg);
  border-color: var(--border);
}

.ribbon-btn.active {
  background: var(--selected-bg);
  border-color: var(--selected-border);
}

.ribbon-btn:disabled {
  opacity: 0.42;
  cursor: default;
}

.ribbon-btn-large {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-width: 54px;
  height: 54px;
  padding: 4px 7px;
  font-size: 11px;
  line-height: 1.15;
  text-align: center;
  white-space: nowrap;
}

.ribbon-btn-small {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 18px;
  padding: 1px 6px;
  font-size: 11px;
  line-height: 1;
  white-space: nowrap;
  text-align: left;
}

.ribbon-stack {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1px;
}

.ribbon-icon {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.ribbon-icon-sm {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* Workspace Grid and Splitters */
.workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: var(--left-panel-width, 260px) 4px minmax(0, 1fr) 4px var(--right-panel-width, 340px);
}

.panel-splitter {
  background: var(--border);
  cursor: col-resize;
  transition: background-color 0.12s ease;
  z-index: 10;
}

.panel-splitter:hover,
.panel-splitter.dragging {
  background: var(--splitter-hover);
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  min-height: 0;
  min-width: 0;
}

.panel-right {
  overflow-y: auto;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-header h2 {
  margin: 0;
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.count-pill {
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-fg);
  font-size: 11px;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 10px;
}

.panel-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 10px 12px;
}

#tree-content {
  flex: 1 1 0;
  min-height: 120px;
}

#findings-content {
  max-height: 290px;
  overflow-y: auto;
}

.empty-state {
  color: var(--text-muted);
  padding: 8px 4px;
  font-style: italic;
}

/* Properties and Collapsible Right-Panel Sections */
.properties-section {
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.properties-body {
  flex: none;
  padding: 10px 12px;
  min-height: 44px;
}

.collapsible-section {
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.collapsible-section[hidden] {
  display: none !important;
}

.collapsible-header {
  height: 34px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  background: var(--panel-bg);
}

.collapsible-header::-webkit-details-marker {
  display: none;
}

.collapsible-header:hover {
  background: var(--hover-bg);
}

.collapsible-header h2::before {
  content: "▸ ";
  display: inline-block;
  width: 12px;
  color: var(--text-muted);
}

details[open] > .collapsible-header h2::before {
  content: "▾ ";
}

.collapsible-section > .collapsible-content {
  display: flex;
  flex-direction: column;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid transparent;
}

.badge-neutral {
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-fg);
}

.badge-fail {
  background: var(--fail-bg);
  color: var(--fail-fg);
  border-color: var(--fail-border);
}

.badge-warn {
  background: var(--warn-bg);
  color: var(--warn-fg);
  border-color: var(--warn-border);
}

.badge-ok {
  background: var(--ok-bg);
  color: var(--ok-fg);
  border-color: var(--ok-border);
}

/* Model Tree */
.tree-root-header {
  font-weight: 600;
  font-size: 12.5px;
  padding: 2px 4px 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}

.tree-folder {
  margin: 2px 0;
}

.tree-folder-summary {
  cursor: pointer;
  padding: 3px 4px;
  border-radius: 4px;
  user-select: none;
}

.tree-folder-summary:hover {
  background: var(--hover-bg);
}

.tree-section-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin: 10px 0 4px 0;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tree-section-title:first-child {
  margin-top: 0;
}

.tree-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tree-children {
  list-style: none;
  margin: 2px 0 2px 14px;
  padding: 0 0 0 8px;
  border-left: 1px solid var(--border);
}

.tree-item {
  padding: 3px 4px;
  border-radius: 4px;
}

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

.tree-name {
  font-weight: 500;
}

.tree-type {
  font-size: 11px;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.tree-meta {
  font-size: 11px;
  color: var(--text-muted);
}

.tree-eop {
  color: var(--text-muted);
  font-size: 11.5px;
  padding: 5px 4px;
  letter-spacing: 0.03em;
  margin-top: 2px;
}

.tree-suppressed {
  opacity: 0.55;
}

/* Viewport & ViewCube Replacement (Axes Gizmo + Home button) */
.viewport-container {
  position: relative;
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
  background: var(--bg);
}

.viewport {
  width: 100%;
  height: 100%;
}

.viewport canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.selection-banner {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  pointer-events: none;
  z-index: 5;
}

.view-gizmo {
  position: absolute;
  bottom: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 5px;
  z-index: 5;
  user-select: none;
}

.gizmo-home-btn {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.22);
}

.gizmo-home-btn:hover {
  color: var(--text);
  background: var(--hover-bg);
  border-color: var(--selected-border);
}

.gizmo-home-btn svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.axes-gizmo {
  width: 58px;
  height: 58px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.22);
  pointer-events: none;
}

.axes-ring {
  fill: none;
  stroke: var(--border);
  stroke-width: 1;
}

.axis-line {
  stroke-width: 2;
  stroke-linecap: round;
}

.axis-line.axis-x { stroke: var(--axis-x); }
.axis-line.axis-y { stroke: var(--axis-y); }
.axis-line.axis-z { stroke: var(--axis-z); }

.axis-label {
  font-size: 9px;
  font-weight: 700;
  text-anchor: middle;
}

.axis-label.axis-x { fill: var(--axis-x); }
.axis-label.axis-y { fill: var(--axis-y); }
.axis-label.axis-z { fill: var(--axis-z); }

.axes-origin {
  fill: var(--text);
}

.viewport-hint {
  position: absolute;
  bottom: 12px;
  left: 80px;
  color: var(--text-muted);
  font-size: 11.5px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 4px;
  opacity: 0.88;
  pointer-events: none;
}

/* Findings */
.findings-summary {
  padding: 8px 12px;
  font-size: 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.finding-card {
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 8px;
  background: var(--panel-bg);
  cursor: pointer;
  transition: background-color 0.1s ease, border-color 0.1s ease;
}

.finding-card:hover {
  background: var(--hover-bg);
}

.finding-card.severity-fail {
  border-left-color: var(--fail-border);
}

.finding-card.severity-warn {
  border-left-color: var(--warn-border);
}

.finding-card.severity-ok {
  border-left-color: var(--ok-border);
}

.finding-card.active {
  background: var(--selected-bg);
  outline: 1.5px solid var(--selected-border);
}

.finding-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 4px;
}

.finding-rule {
  font-weight: 600;
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.finding-msg {
  font-size: 12.5px;
  margin-bottom: 5px;
  word-break: break-word;
}

.finding-loc {
  font-size: 11px;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--code-bg);
  display: inline-block;
  padding: 1px 6px;
  border-radius: 3px;
}

.mode-switch { margin-left: 12px; font-size: 13px; white-space: nowrap; }
.mode-switch a { margin-left: 8px; }

/* Agent chat */
.chat-panel { display: flex; flex-direction: column; border-top: 1px solid var(--border); max-height: 55%; min-height: 200px; }
details.chat-panel { display: block; border-top: 0; max-height: none; min-height: 0; margin-top: auto; border-top: 1px solid var(--border); }
details.chat-panel > .chat-body { display: flex; flex-direction: column; }
details.chat-panel .chat-log { min-height: 64px; max-height: 160px; overflow-y: auto; }
.chat-panel[hidden] { display: none !important; }
.chat-actions { display: inline-flex; gap: 2px; }
.chat-panel .chat-log { flex: 1; min-height: 80px; overflow: auto; list-style: none; margin: 0; padding: 8px 12px; }
.chat-log li { margin: 0 0 10px; font-size: 13px; line-height: 1.5; white-space: pre-wrap; }
.chat-log .you { background: var(--hover-bg); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; }
.chat-log .dev { border: 1px dashed var(--selected-border); border-radius: 8px; padding: 6px 10px; color: var(--text-muted); font-style: italic; }
.chat-log .you .sel { display: block; font-size: 11px; color: var(--text-muted); }
.chat-log .tool { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; color: var(--text-muted); }
.chat-log .tool::before { content: "●"; margin-right: 6px; color: #9ca3af; }
.chat-log .tool.ok::before { color: #22c55e; }
.chat-log .tool.failed::before { color: #ef4444; }
.chat-log .tool.declined::before { color: #f59e0b; }
.chat-log .note { font-size: 12px; color: var(--text-muted); }
.chat-log .err { color: var(--fail-fg); }
.chat-log .working { font-size: 12px; color: #d97757; }
.chat-composer { display: flex; gap: 6px; padding: 8px 12px 10px; border-top: 1px solid var(--border); align-items: flex-end; }
.chat-input { flex: 1; min-width: 0; resize: vertical; font: inherit; font-size: 13px; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px; }
.send-btn { align-self: flex-end; width: 32px; height: 32px; border-radius: 50%; border: 0; cursor: pointer; font-size: 15px;
  background: #d97757; color: #fff; flex-shrink: 0; }
.send-btn.stop { background: var(--fail-border); }
.mic-btn { align-self: flex-end; width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--border); cursor: pointer;
  background: var(--panel-bg); font-size: 14px; flex-shrink: 0; }
.mic-btn[hidden] { display: none !important; }
.mic-btn:disabled { opacity: 0.45; cursor: default; }
.mic-btn.listening { background: var(--fail-bg); border-color: var(--fail-border); }

/* Measure and section tools */
.view-tools { position: absolute; top: 12px; right: 12px; display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; align-items: center; max-width: calc(100% - 24px); }
.view-tools button, .view-tools select, .section-controls select, .section-controls button {
  font: inherit; font-size: 12px; color: var(--text); background: var(--panel-bg);
  border: 1px solid var(--border); border-radius: 4px; padding: 3px 9px; cursor: pointer;
}
.view-tools button:hover, .section-controls button:hover { background: var(--hover-bg); }
.view-tools button.active { border-color: var(--selected-border); background: var(--selected-bg); }
.section-controls { display: inline-flex; gap: 6px; align-items: center; padding: 0 4px; }
.section-controls[hidden] { display: none !important; }
.rule-setup[hidden] { display: none !important; }
.section-controls input { width: 130px; }
.measure-readout { position: absolute; top: 12px; right: 12px; background: var(--panel-bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 6px 10px; font-size: 12px; line-height: 1.5; font-variant-numeric: tabular-nums; z-index: 6; }

/* Profile and material for the design rules, above the findings */
.rule-setup { display: flex; gap: 6px; padding: 8px 12px 0; }
.rule-setup select { flex: 1; min-width: 0; font: inherit; font-size: 12px; color: var(--text); background: var(--panel-bg);
  border: 1px solid var(--border); border-radius: 4px; padding: 3px 5px; }

/* Parameter form under the model tree */
.params-section { border-top: 1px solid var(--border); display: flex; flex-direction: column; flex: 0 1 48%; min-height: 180px; max-height: 50%; overflow: hidden; }
.params-section[hidden] { display: none !important; }
.params-body { padding-top: 6px; flex: 1 1 auto; min-height: 0; overflow-y: auto; }
.param-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr) auto; gap: 6px; align-items: center; padding: 2px 0; }
.param-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.param-row input { font: inherit; font-size: 12px; min-width: 0; padding: 2px 5px; color: var(--text); background: transparent; border: 1px solid var(--border); border-radius: 4px; }
.param-row input.param-changed { border-color: var(--selected-border); }
.param-value { color: var(--text-muted); font-size: 11px; white-space: nowrap; }
.params-body summary { color: var(--text-muted); cursor: pointer; padding: 4px 0; font-size: 12px; }
.params-error { color: var(--fail-fg); font-size: 12px; padding: 0 12px 8px; }

/* Status bar at bottom (ADR 0005 Stage 1) */
.statusbar {
  height: 28px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  background: var(--statusbar-bg);
  border-top: 1px solid var(--border);
  font-size: 12px;
}

.statusbar-left,
.statusbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.statusbar .doc-name {
  font-size: 12px;
  font-weight: 600;
}

.status-sep {
  color: var(--text-muted);
}

.status-core {
  color: var(--text-muted);
  white-space: nowrap;
}

.status-core a {
  color: var(--link);
  text-decoration: none;
}

.status-core a:hover {
  text-decoration: underline;
}

/* Whether Mechvane stops with this window, Quit button for a browser tab */
.topbar-right { flex-shrink: 0; margin-left: 16px; }
.topbar-right > * { white-space: nowrap; }
.run-state { display: inline-flex; align-items: center; gap: 4px; }
.run-state .status-text { font-size: 12px; }
.run-stopped { margin: 20vh auto; text-align: center; color: var(--text-muted); }

/* Narrow / mobile width (< 760 px): ribbon horizontally scrollable, panels stacked vertically */
@media (max-width: 760px) {
  html, body {
    height: auto;
    min-height: 100%;
    overflow-y: auto;
  }
  .topbar {
    height: auto;
    min-height: 44px;
    flex-wrap: wrap;
    gap: 4px 10px;
    padding: 6px 12px;
  }
  .topbar-left, .topbar-right, .demo-bar { flex-wrap: wrap; }
  .doc-path { display: none; }
  .mode-switch, .demo-bar { margin-left: 0; }
  .ribbon-bar {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .workspace {
    grid-template-columns: 1fr;
    height: auto;
    flex: none;
  }
  .panel-splitter {
    display: none;
  }
  .viewport-container {
    order: -1;
    height: 54vh;
    min-height: 280px;
  }
  .panel-left, .panel-right {
    border: 0;
    border-top: 1px solid var(--border);
    height: auto;
    max-height: none;
    overflow: visible;
  }
  .collapsible-section,
  .collapsible-section[open],
  .design-check-section[open],
  details.chat-panel[open],
  .collapsible-section > .collapsible-content,
  details.chat-panel > .chat-body,
  .panel-body,
  #tree-content,
  #findings-content,
  .params-section {
    flex: none;
    height: auto;
    max-height: none;
    min-height: 0;
    overflow: visible;
  }
  .panel-left {
    order: 1;
  }
  .viewport-hint {
    display: none;
  }
  .statusbar {
    height: auto;
    min-height: 28px;
    flex-wrap: wrap;
    padding: 4px 10px;
    gap: 4px 8px;
  }
}

/* Request a feature button and dialog */
.btn-text {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  padding: 3px 8px;
  border-radius: 4px;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.btn-text:hover {
  color: var(--text);
  background: var(--hover-bg);
  border-color: var(--border);
}

dialog.request-dialog {
  background: var(--panel-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  max-width: 480px;
  width: calc(100vw - 32px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

dialog.request-dialog::backdrop {
  background: var(--bg);
  opacity: 0.75;
}

.request-form {
  display: flex;
  flex-direction: column;
}

.request-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.request-dialog-header h3 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.request-dialog-close {
  background: transparent;
  border: 0;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}

.request-dialog-close:hover {
  color: var(--text);
  background: var(--hover-bg);
}

.request-dialog-body {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.request-field-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.request-field-group label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

.request-field-group label .required {
  color: var(--fail-fg);
}

.request-dialog input[type="text"],
.request-dialog select,
.request-dialog textarea {
  font: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  outline: none;
}

.request-dialog input[type="text"]:focus,
.request-dialog select:focus,
.request-dialog textarea:focus {
  border-color: var(--selected-border);
}

.request-checkbox-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text);
  margin-top: 2px;
}

.request-checkbox-row label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.request-checkbox-row input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--selected-border);
}

.request-versions-preview {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--code-bg);
  padding: 6px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  word-break: break-all;
}

.request-dialog-note {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.4;
}

.request-dialog-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--panel-bg);
  border-bottom-left-radius: 8px;
  border-bottom-right-radius: 8px;
}

.request-dialog-footer .btn-cancel {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
}

.request-dialog-footer .btn-cancel:hover {
  background: var(--hover-bg);
}

.request-dialog-footer .btn-submit {
  background: var(--selected-bg);
  border: 1px solid var(--selected-border);
  color: var(--text);
  font: inherit;
  font-size: 12.5px;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 6px;
  cursor: pointer;
}

.request-dialog-footer .btn-submit:hover {
  background: var(--selected-border);
  color: var(--bg);
}

/* New part dialog: error from api/new (name taken, invalid name) shown inline */
.new-part-error {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--fail-border);
  background: var(--fail-bg);
  color: var(--fail-fg);
  font-size: 13px;
}
#new-part-file {
  font-family: ui-monospace, monospace;
}

/* Quick access: Undo / Redo next to the File menu */
.quick-access { display: flex; align-items: center; gap: 2px; }
.qa-btn { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 24px; padding: 0;
  background: transparent; border: 1px solid transparent; border-radius: 4px; color: var(--text); cursor: pointer; }
.qa-btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.qa-btn:hover:not(:disabled) { background: var(--hover-bg); border-color: var(--border); }
.qa-btn:disabled { opacity: 0.35; cursor: default; }
.qa-btn[hidden] { display: none; }

/* Feature dialogs in the Properties panel (ADR 0005, stage 2) */
.feature-dialog { display: flex; flex-direction: column; gap: 8px; font-size: 12px; }
.feature-dialog-title { font-weight: 600; font-size: 13px; }
.feature-pick { display: flex; align-items: center; justify-content: space-between; gap: 6px; min-height: 24px;
  padding: 3px 8px; border: 1px solid var(--selected-border); border-radius: 4px; background: var(--selected-bg); }
.feature-pick-count { color: var(--text); }
.feature-field { display: grid; grid-template-columns: 70px minmax(0, 1fr) auto; gap: 6px; align-items: center; }
.feature-field input { font: inherit; font-size: 12px; min-width: 0; padding: 3px 6px; color: var(--text);
  background: transparent; border: 1px solid var(--border); border-radius: 4px; }
.feature-field input:focus { outline: none; border-color: var(--selected-border); }
.feature-unit { color: var(--text-muted); }
.feature-delta { color: var(--text-muted); min-height: 0; }
.feature-delta:empty { display: none; }
.feature-error { color: var(--fail-fg); white-space: pre-wrap; }
.feature-error[hidden] { display: none; }
.feature-actions { display: flex; justify-content: flex-end; gap: 6px; }
.feature-ok { font: inherit; font-size: 12px; font-weight: 600; padding: 3px 14px; border-radius: 4px; cursor: pointer;
  color: var(--bg); background: var(--selected-border); border: 1px solid var(--selected-border); }
.feature-ok:disabled { opacity: 0.4; cursor: default; }

/* Model browser: selected feature and its context menu */
.tree-row[data-feature] { cursor: default; border-radius: 3px; }
.tree-row[data-feature].selected { background: var(--selected-bg); outline: 1px solid var(--selected-border); }
.context-menu { position: fixed; z-index: 50; min-width: 160px; padding: 4px; display: flex; flex-direction: column;
  background: var(--panel-bg); border: 1px solid var(--border); border-radius: 6px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35); }
.context-menu[hidden] { display: none; }
.context-item { font: inherit; font-size: 12px; text-align: left; padding: 5px 10px; color: var(--text); background: transparent;
  border: 0; border-radius: 4px; cursor: pointer; }
.context-item:hover:not(:disabled) { background: var(--hover-bg); }
.context-item:disabled { color: var(--text-muted); cursor: default; }
.feature-field[hidden] { display: none; }
.feature-field select { font: inherit; font-size: 12px; min-width: 0; padding: 2px 4px; color: var(--text);
  background: var(--panel-bg); border: 1px solid var(--border); border-radius: 4px; }
.feature-field input[readonly] { color: var(--text-muted); border-style: dashed; }
.feature-check input { justify-self: start; margin: 0; }
.feature-position { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px; }
.feature-position .feature-field { grid-template-columns: 12px minmax(0, 1fr) auto; gap: 3px; }
.feature-position .feature-unit { display: none; }
.feature-note { color: var(--text-muted); font-size: 11px; }
.feature-note:empty { display: none; }
.tree-row[data-feature].picked { background: var(--selected-bg); outline: 1px dashed var(--selected-border); }
.tree-row[data-feature].picked .tree-name::before { content: "✓ "; color: var(--selected-border); }
.sketch-shapes { display: flex; flex-direction: column; gap: 2px; }
.sketch-shape { display: flex; justify-content: space-between; align-items: center; padding: 1px 6px;
  border: 1px solid var(--border); border-radius: 4px; color: var(--text); }
.sketch-add-row { justify-content: flex-start; }