rvt 0.4.0

/* rvt-rs viewer on the Sonic Console design system.
 *
 * Every colour, size, radius, shadow and duration is a token from
 * tokens.css. Two of the system's typography conventions are not used, by
 * the project's own rule: nothing is set in a monospace face (figures use
 * tabular numerals in the sans face instead), and labels are bold sentence
 * case rather than uppercase.
 *
 * Frame: a black 56px header over a white sheet with 32px top corners. The
 * left panel is the navbar, the 3D view sits on the sheet, and the right
 * panel holds the file status, element info and schedule.
 */

:root {
  /* Roles the viewer adds, built from the system's ramps. */
  --viewer-canvas: var(--sx-gray-1);
  --viewer-grid: var(--sx-gray-3);
  --viewer-grid-soft: var(--sx-gray-2);
  --viewer-highlight: var(--sx-blue-6);
  --viewer-light-sky: var(--sx-white);
  --viewer-light-ground: var(--sx-gray-3);
  --viewer-left-width: var(--sx-app-navbar-width);
  --viewer-right-width: 320px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --viewer-canvas: var(--sx-dark-8);
    --viewer-grid: var(--sx-dark-4);
    --viewer-grid-soft: var(--sx-dark-5);
    --viewer-light-sky: var(--sx-dark-0);
    --viewer-light-ground: var(--sx-dark-8);
  }
}
:root[data-theme='dark'] {
  --viewer-canvas: var(--sx-dark-8);
  --viewer-grid: var(--sx-dark-4);
  --viewer-grid-soft: var(--sx-dark-5);
  --viewer-light-sky: var(--sx-dark-0);
  --viewer-light-ground: var(--sx-dark-8);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  overflow: hidden;
  font-family: var(--sx-font-sans);
  font-size: var(--sx-fs-sm);
  line-height: var(--sx-lh-md);
  color: var(--sx-color-text);
  /* The chrome shows around the sheet's rounded top corners. */
  background: var(--sx-color-chrome);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button,
input,
select,
textarea {
  font-family: inherit;
}

/* ---- App shell ---------------------------------------------------------- */

#app {
  display: grid;
  /* minmax(0, …): nothing inside the viewport, least of all the canvas's
     device-pixel backing size, may widen its track. */
  grid-template-columns: var(--viewer-left-width) minmax(0, 1fr) var(--viewer-right-width);
  grid-template-rows: var(--sx-app-header-height) minmax(0, 1fr);
  height: 100vh;
}

header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--sx-space-sm);
  min-width: 0;
  padding: 0 var(--sx-space-md);
  color: var(--sx-color-on-chrome);
  background: var(--sx-color-chrome);
}
header h1 {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--sx-color-on-chrome);
  white-space: nowrap;
}
header h1 span {
  font-weight: var(--sx-fw-medium);
  letter-spacing: 0;
  color: var(--sx-blue-4);
}
header .meta {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--sx-fs-compact);
  font-weight: var(--sx-fw-medium);
  color: var(--sx-color-on-chrome-muted);
}
header label.meta {
  flex: none;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
}

/* Quality: a sentence-case badge in the tone of the bar it meets. */
header .quality-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  height: 20px;
  padding: 0 8px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  border-radius: var(--sx-radius-full);
  color: var(--sx-color-on-chrome);
  background: var(--sx-color-on-chrome-hover);
  transition:
    background-color var(--sx-duration-fast) var(--sx-ease-standard),
    color var(--sx-duration-fast) var(--sx-ease-standard);
}
header .quality-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}
header .quality-pill.scaffold,
header .quality-pill.diagnostic {
  color: var(--sx-amber-4);
  background: rgba(245, 158, 11, 0.15);
}
header .quality-pill.typed {
  color: var(--sx-blue-3);
  background: rgba(61, 148, 255, 0.15);
}
header .quality-pill.geometry {
  color: var(--sx-green-4);
  background: rgba(34, 197, 94, 0.15);
}
header .quality-pill.is-updated {
  animation: viewer-settle var(--sx-duration-enter) var(--sx-ease-out);
}

/* The quality bar is a header menu target: white text, a white 10% hover,
   radius 8. */
header .mode-select {
  flex: none;
  height: 30px;
  padding: 0 28px 0 10px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-medium);
  color: var(--sx-color-on-chrome);
  background: transparent
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23909398' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M8 9l4-4 4 4M16 15l-4 4-4-4'/%3E%3C/svg%3E")
    no-repeat right 8px center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--sx-radius-md);
  appearance: none;
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
header .mode-select:hover {
  background-color: var(--sx-color-on-chrome-hover);
}
header .mode-select option {
  color: var(--sx-black);
}

/* Exports. Export IFC is the one primary action: a filled pill. The others
   are header menu targets. */
header .export-btn {
  flex: none;
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 6px 10px;
  font-size: var(--sx-fs-sm);
  font-weight: var(--sx-fw-medium);
  line-height: 1;
  color: var(--sx-color-on-chrome);
  background: none;
  border: 0;
  border-radius: var(--sx-radius-md);
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color var(--sx-duration-fast) var(--sx-ease-standard),
    color var(--sx-duration-fast) var(--sx-ease-standard);
}
header .export-btn:hover:not(:disabled) {
  background: var(--sx-color-on-chrome-hover);
}
header .export-btn:disabled {
  color: var(--sx-color-on-chrome-muted);
  cursor: not-allowed;
}
header .export-btn.primary {
  height: 30px;
  padding: 0 14px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-primary-contrast);
  background: var(--sx-color-primary);
  border-radius: var(--sx-radius-xl);
}
header .export-btn.primary:hover:not(:disabled) {
  background: var(--sx-color-primary-hover);
}
header .export-btn.primary:disabled {
  color: var(--sx-color-disabled-text);
  background: var(--sx-gray-8);
}
header .export-btn:active:not(:disabled) {
  transform: translateY(1px);
}

/* ---- Panels: the navbar and the right-hand panel ------------------------ */

#sidebar-left,
#sidebar-right {
  min-width: 0;
  overflow-y: auto;
  padding: var(--sx-space-md) var(--sx-space-sm) var(--sx-space-sm);
  background: var(--sx-color-body);
}
#sidebar-left {
  border-right: 1px solid var(--sx-color-border-subtle);
  border-top-left-radius: var(--sx-app-sheet-radius);
}
#sidebar-right {
  border-left: 1px solid var(--sx-color-border-subtle);
  border-top-right-radius: var(--sx-app-sheet-radius);
}
/* Section labels: bold sentence case in the secondary text colour. */
#sidebar-left h2,
#sidebar-right h2 {
  margin: var(--sx-space-md) 0 6px;
  padding: 0 4px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-bold);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-text-secondary);
}
#sidebar-left h2:first-child,
#sidebar-right h2:first-child {
  margin-top: 4px;
}

/* ---- Scene tree: nav links ---------------------------------------------- */

/* The filter sits above the tree, as a navbar's search does. */
.tree-filter {
  margin: 0 0 8px;
}
.tree-filter input {
  width: 100%;
  height: 32px;
  padding: 0 10px;
  font-size: var(--sx-fs-compact);
  color: var(--sx-color-text);
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border);
  border-radius: var(--sx-radius-md);
  transition: border-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.tree-filter input::placeholder {
  color: var(--sx-color-dimmed);
}
.tree-filter input:focus-visible {
  outline: none;
  border-color: var(--sx-color-primary);
}
.tree-filter input:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}
.tree-filter-status {
  padding: 4px 4px 0;
  font-size: var(--sx-fs-xs);
  color: var(--sx-color-dimmed);
}
.tree-filter-status:empty {
  display: none;
}
.tree-item[hidden] {
  display: none;
}

.tree-node {
  display: flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 8px;
  font-size: var(--sx-fs-compact);
  font-weight: var(--sx-fw-medium);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-text);
  overflow-wrap: anywhere;
  border-radius: var(--sx-radius-md);
  cursor: pointer;
  user-select: none;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.tree-node:hover {
  background: var(--sx-color-selected-hover);
}
.tree-node.selected,
.tree-node:focus-visible {
  background: var(--sx-color-selected);
  color: var(--sx-color-text);
}
.tree-node.tree-project {
  font-weight: var(--sx-fw-bold);
  color: var(--sx-color-title);
}
.tree-node.tree-storey {
  font-weight: var(--sx-fw-semibold);
}
.tree-node.tree-storey-empty {
  font-weight: var(--sx-fw-regular);
  color: var(--sx-color-dimmed);
}
.tree-node.tree-storey-unassigned {
  color: var(--sx-color-warning);
}
.tree-node.tree-category {
  font-weight: var(--sx-fw-semibold);
}
/* Rows open and close from a chevron, drawn as the diagnostics disclosure's. */
.tree-caret {
  display: inline-flex;
  flex: none;
  align-self: flex-start;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 1lh;
  margin: 0 4px 0 -4px;
  border-radius: var(--sx-radius-sm);
}
.tree-caret::before {
  content: '';
  width: 6px;
  height: 6px;
  border: solid var(--sx-color-dimmed);
  border-width: 0 1.75px 1.75px 0;
  transform: translateX(-1px) rotate(-45deg);
  transition: transform var(--sx-duration-base) var(--sx-ease-standard);
}
.tree-node[aria-expanded='true'] > .tree-caret::before {
  transform: translateY(-1px) rotate(45deg);
}
.tree-caret-none::before {
  content: none;
}
.tree-caret:not(.tree-caret-none):hover {
  background: var(--sx-color-selected-hover);
}
/* A row reads as its label over a quieter line (an element's family and
   ElementId, a storey's elevation), with a category's count on the right. */
.tree-text {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  min-width: 0;
}
.tree-detail {
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-regular);
  color: var(--sx-color-dimmed);
}
.tree-node.tree-storey-unassigned .tree-detail {
  color: inherit;
}
.tree-count {
  flex: none;
  padding-left: 8px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-regular);
  font-variant-numeric: tabular-nums;
  color: var(--sx-color-dimmed);
}
/* Children hang off a 1px rail, as the navbar's sub-links do. */
.tree-children {
  margin-left: 12px;
  padding-left: 6px;
  border-left: 1px solid var(--sx-color-border-subtle);
}
.tree-children[hidden] {
  display: none;
}

/* ---- Categories: checkbox rows ------------------------------------------ */

.category-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 30px;
  padding: 4px 8px;
  font-size: var(--sx-fs-compact);
  font-weight: var(--sx-fw-medium);
  border-radius: var(--sx-radius-md);
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.category-toggle:hover {
  background: var(--sx-color-selected-hover);
}
.category-toggle .tree-count {
  margin-left: auto;
}
.category-empty {
  padding: 4px 8px;
  font-size: var(--sx-fs-xs);
  color: var(--sx-color-dimmed);
}
.category-toggle:focus-within {
  background: var(--sx-color-selected);
}
.category-toggle input {
  appearance: none;
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 16px;
  height: 16px;
  margin: 0;
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border-strong);
  border-radius: var(--sx-radius-sm);
  cursor: pointer;
  transition:
    background-color var(--sx-duration-fast),
    border-color var(--sx-duration-fast);
}
.category-toggle input:checked {
  background: var(--sx-color-primary);
  border-color: var(--sx-color-primary);
}
.category-toggle input:checked::after {
  content: '';
  width: 8px;
  height: 5px;
  border: solid #fff;
  border-width: 0 0 2px 2px;
  transform: translateY(-1px) rotate(-45deg);
}

/* ---- Viewport ------------------------------------------------------------ */

#viewport {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--viewer-canvas);
}
/* The renderer sizes the canvas's backing store in device pixels and
   leaves its CSS size alone, so the element is pinned to the viewport
   here. Without this a 2x display lays it out twice as large. */
#viewport canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

/* ---- Open a file --------------------------------------------------------- */

#dropzone {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: safe center;
  overflow-y: auto;
  padding: var(--sx-space-6) var(--sx-space-md);
  /* Opaque: the empty scene's grid must not draw lines through the text. */
  background: var(--sx-color-body);
  color: var(--sx-color-text);
  transition: background-color var(--sx-duration-base) var(--sx-ease-standard);
}
#dropzone.drag-over {
  background: var(--sx-color-selected-hover);
  box-shadow: inset 0 0 0 2px var(--sx-color-primary);
}
#dropzone.hidden {
  display: none;
}
#dropzone .big {
  margin-bottom: 6px;
  font-size: var(--sx-h3);
  font-weight: var(--sx-fw-bold);
  line-height: var(--sx-h3-lh);
  color: var(--sx-color-title);
  text-align: center;
}
#dropzone .hint {
  max-width: 440px;
  font-size: var(--sx-fs-sm);
  line-height: var(--sx-lh-sm);
  color: var(--sx-color-dimmed);
  text-align: center;
}
#dropzone .hint a {
  color: var(--sx-color-link);
  font-weight: var(--sx-fw-medium);
  text-decoration: none;
}
#dropzone .hint a:hover {
  text-decoration: underline;
}
/* The one primary action on this screen: a filled pill. */
#pick-file {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  margin-top: var(--sx-space-lg);
  padding: 0 18px;
  font-size: var(--sx-fs-sm);
  font-weight: var(--sx-fw-semibold);
  line-height: 1;
  color: var(--sx-color-primary-contrast);
  background: var(--sx-color-primary);
  border: 1px solid transparent;
  border-radius: var(--sx-radius-xl);
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
#pick-file:hover {
  background: var(--sx-color-primary-hover);
}
#pick-file:active {
  transform: translateY(1px);
}

#demo-gallery {
  width: min(720px, 92%);
  margin-top: var(--sx-space-xl);
  text-align: left;
}
#demo-gallery h2 {
  margin: 0 0 4px;
  font-size: var(--sx-h4);
  font-weight: var(--sx-fw-bold);
  line-height: var(--sx-h4-lh);
  color: var(--sx-color-title);
}
#demo-gallery .gallery-attribution {
  margin-bottom: var(--sx-space-sm);
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-dimmed);
}
#demo-list {
  display: grid;
  gap: 8px;
  max-height: min(42vh, 360px);
  overflow-y: auto;
}

/* Demo cards: resource cards with an image tile. */
.demo-card {
  position: relative;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: var(--sx-space-sm);
  align-items: start;
  width: 100%;
  padding: var(--sx-space-sm);
  font: inherit;
  color: inherit;
  text-align: left;
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border-subtle);
  border-radius: var(--sx-radius-default);
  cursor: pointer;
  transition:
    border-color var(--sx-duration-fast) var(--sx-ease-standard),
    background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.demo-card:hover:not(:disabled) {
  background: var(--sx-color-selected-hover);
  border-color: var(--sx-blue-2);
}
.demo-card:active:not(:disabled) {
  background: var(--sx-color-selected);
}
.demo-card:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}
.demo-card:focus-visible {
  border-color: var(--sx-color-primary);
}
.demo-card img {
  width: 72px;
  height: 40px;
  object-fit: cover;
  background: var(--sx-color-surface-muted);
  border: 1px solid var(--sx-color-border-subtle);
  border-radius: var(--sx-radius-md);
  transition: opacity var(--sx-duration-base) var(--sx-ease-standard);
}
.demo-card:disabled img,
.demo-card[aria-busy='true'] img {
  opacity: 0.5;
}
.demo-card .demo-title {
  font-size: var(--sx-fs-sm);
  font-weight: var(--sx-fw-semibold);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-text);
}
.demo-card .demo-meta {
  margin-top: 2px;
  font-size: 11px;
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-dimmed);
  white-space: pre-line;
}
/* Badges: sentence case, a light tint of the tone colour. */
.demo-card .demo-quality,
.demo-badge {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 8px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  border-radius: var(--sx-radius-full);
  white-space: nowrap;
}
.demo-card .demo-quality {
  margin-top: 6px;
  color: var(--sx-color-warning);
  background: var(--sx-color-warning-light);
}
.demo-card .demo-quality.geometry {
  color: var(--sx-color-success);
  background: var(--sx-color-success-light);
}
.demo-card .demo-quality.reference {
  color: var(--sx-color-primary);
  background: var(--sx-color-primary-light);
}
.demo-badge {
  margin-left: 8px;
  vertical-align: 1px;
  color: var(--sx-color-primary);
  background: var(--sx-color-primary-light);
}
.demo-card[data-demo-real='true'] {
  border-color: var(--sx-color-border);
}
.demo-card[aria-busy='true'] {
  cursor: progress;
  border-color: var(--sx-blue-2);
}
.demo-card[aria-busy='true'] .demo-title {
  color: var(--sx-color-dimmed);
}
.demo-card[aria-busy='true']::before,
.demo-card[aria-busy='true']::after {
  content: '';
  position: absolute;
  bottom: -1px;
  height: 2px;
}
.demo-card[aria-busy='true']::before {
  left: var(--sx-space-sm);
  right: var(--sx-space-sm);
  background: var(--sx-color-surface-muted);
}
.demo-card[aria-busy='true']::after {
  left: var(--sx-space-sm);
  width: 33%;
  background: var(--sx-color-primary);
  animation: viewer-sweep 1.4s var(--sx-ease-standard) infinite;
}
.demo-card.is-flagged {
  animation: viewer-flag 1.1s var(--sx-ease-standard) 2;
}

/* ---- Loading ------------------------------------------------------------- */

#load-overlay {
  position: absolute;
  inset: 0;
  z-index: 11;
  display: grid;
  place-items: center;
  background: var(--sx-loading-veil);
  backdrop-filter: blur(2px);
}
#load-overlay.hidden {
  display: none;
}
.load-card {
  width: min(420px, 84%);
  padding: var(--sx-space-md);
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border-subtle);
  border-radius: var(--sx-radius-default);
  box-shadow: var(--sx-shadow-md);
  animation: viewer-enter var(--sx-duration-enter) var(--sx-ease-out) both;
}
#load-step {
  font-size: var(--sx-fs-sm);
  font-weight: var(--sx-fw-semibold);
  line-height: var(--sx-lh-sm);
  color: var(--sx-color-text);
}
/* An indeterminate progress bar: blue on the muted track. */
.sweep-rail {
  position: relative;
  height: 8px;
  overflow: hidden;
  background: var(--sx-color-surface-muted);
  border-radius: var(--sx-radius-full);
}
.sweep-rail::after {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 33%;
  background: var(--sx-color-primary);
  border-radius: inherit;
  animation: viewer-sweep 1.4s var(--sx-ease-standard) infinite;
}
.load-card .sweep-rail {
  margin: var(--sx-space-sm) 0 var(--sx-space-xs);
}
#load-metrics {
  display: flex;
  justify-content: space-between;
  gap: var(--sx-space-sm);
  font-size: var(--sx-fs-xs);
  color: var(--sx-color-dimmed);
  font-variant-numeric: tabular-nums;
}
.load-privacy {
  margin-top: var(--sx-space-xs);
  padding-top: var(--sx-space-xs);
  font-size: var(--sx-fs-xs);
  color: var(--sx-color-dimmed);
  border-top: 1px solid var(--sx-color-border-subtle);
}

/* ---- A file with nothing to draw: a warning alert ------------------------ */

#scaffold-note {
  position: absolute;
  inset: 0;
  z-index: 8;
  display: grid;
  place-items: center;
  pointer-events: none;
  animation: viewer-enter var(--sx-duration-enter) var(--sx-ease-out) both;
}
#scaffold-note.hidden {
  display: none;
}
.note-card {
  width: min(460px, 86%);
  padding: var(--sx-space-sm) var(--sx-space-md);
  pointer-events: auto;
  color: var(--sx-color-text);
  /* The alert's tone tint over an opaque surface, so the canvas does not
     show through. */
  background:
    linear-gradient(var(--sx-color-warning-light), var(--sx-color-warning-light)),
    var(--sx-color-surface);
  border-radius: var(--sx-radius-default);
  box-shadow: var(--sx-shadow-sm);
}
.note-title {
  margin: 0 0 2px;
  font-size: var(--sx-fs-sm);
  font-weight: var(--sx-fw-bold);
  color: var(--sx-color-warning);
}
.note-card p {
  max-width: 58ch;
  margin: 0;
  font-size: var(--sx-fs-sm);
  line-height: var(--sx-lh-sm);
}
.note-actions {
  display: flex;
  gap: 8px;
  margin-top: var(--sx-space-sm);
}
.note-btn {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 14px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  line-height: 1;
  color: var(--sx-color-primary-contrast);
  background: var(--sx-color-primary);
  border: 1px solid transparent;
  border-radius: var(--sx-radius-xl);
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.note-btn:hover {
  background: var(--sx-color-primary-hover);
}
.note-btn:active {
  transform: translateY(1px);
}
.note-btn.quiet {
  color: var(--sx-color-text);
  background: var(--sx-color-surface);
  border-color: var(--sx-color-border);
}
.note-btn.quiet:hover {
  background: var(--sx-color-hover);
}

/* ---- Toasts and the status line ------------------------------------------ */

#toast-region {
  position: absolute;
  right: var(--sx-space-sm);
  bottom: var(--sx-space-sm);
  z-index: 12;
  display: grid;
  gap: 8px;
  justify-items: end;
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  max-width: min(360px, 62%);
  padding: var(--sx-space-sm) var(--sx-space-sm) var(--sx-space-sm) 14px;
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-text);
  overflow-wrap: anywhere;
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border-subtle);
  border-radius: var(--sx-radius-default);
  box-shadow: var(--sx-shadow-lg);
  animation: viewer-toast-in var(--sx-duration-enter) var(--sx-ease-out) both;
}
.toast::before {
  content: '';
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 4px;
  border-radius: 50%;
  background: var(--sx-color-primary);
}
.toast.ok::before {
  background: var(--sx-color-success);
}
.toast.bad::before {
  background: var(--sx-color-danger);
}
.toast.leaving {
  animation: viewer-toast-out var(--sx-duration-base) var(--sx-ease-standard) both;
}

#status {
  position: absolute;
  bottom: var(--sx-space-sm);
  left: var(--sx-space-sm);
  max-width: min(520px, calc(100% - 24px));
  padding: 6px 10px;
  overflow: hidden;
  overflow-wrap: anywhere;
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-dimmed);
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border);
  border-radius: var(--sx-radius-md);
  transition:
    border-color var(--sx-duration-fast) var(--sx-ease-standard),
    color var(--sx-duration-fast) var(--sx-ease-standard);
}
#status.is-busy {
  color: var(--sx-color-text);
  border-color: var(--sx-blue-2);
}
#status.is-busy::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40%;
  height: 2px;
  background: var(--sx-color-primary);
  animation: viewer-sweep 1.4s var(--sx-ease-standard) infinite;
}

/* ---- File status ---------------------------------------------------------- */

.status-panel {
  display: grid;
  margin-bottom: var(--sx-space-xs);
}
.status-row {
  display: grid;
  grid-template-columns: 10px 88px 1fr;
  gap: 8px;
  align-items: start;
  padding: 8px 4px;
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  border-bottom: 1px solid var(--sx-color-border-subtle);
  animation: viewer-enter var(--sx-duration-base) var(--sx-ease-out) both;
  animation-delay: calc(var(--row-i, 0) * 22ms);
}
.status-dot {
  width: 8px;
  height: 8px;
  margin-top: 4px;
  border-radius: 50%;
  background: var(--sx-color-border-strong);
  transition: background-color var(--sx-duration-base) var(--sx-ease-standard);
}
.status-dot.ok {
  background: var(--sx-color-success);
}
.status-dot.warn {
  background: var(--sx-color-warning);
}
.status-dot.bad {
  background: var(--sx-color-danger);
}
.status-label {
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-text);
}
.status-value {
  color: var(--sx-color-dimmed);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

/* Panel buttons: outline pills, the dense 30px size. */
.side-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 30px;
  margin: 4px 0 8px;
  padding: 0 14px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  line-height: 1;
  color: var(--sx-color-text);
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border);
  border-radius: var(--sx-radius-xl);
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.side-btn:hover:not(:disabled) {
  background: var(--sx-color-hover);
}
.side-btn:active:not(:disabled) {
  transform: translateY(1px);
}
.side-btn:disabled {
  color: var(--sx-color-disabled-text);
  background: var(--sx-color-disabled);
  border-color: transparent;
  cursor: not-allowed;
}

/* Diagnostics: an accordion row over a code panel set in the sans face. */
#diagnostics-details {
  margin-bottom: var(--sx-space-sm);
  font-size: var(--sx-fs-xs);
  color: var(--sx-color-dimmed);
  background: var(--sx-color-surface);
  border: 1px solid var(--sx-color-border-subtle);
  border-radius: var(--sx-radius-md);
  overflow: hidden;
}
#diagnostics-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-weight: var(--sx-fw-medium);
  color: var(--sx-color-text);
  list-style: none;
  cursor: pointer;
}
#diagnostics-details summary::-webkit-details-marker {
  display: none;
}
#diagnostics-details summary::after {
  content: '';
  width: 6px;
  height: 6px;
  margin-right: 2px;
  border: solid var(--sx-color-dimmed);
  border-width: 0 1.75px 1.75px 0;
  transform: translateY(-2px) rotate(45deg);
  transition: transform var(--sx-duration-base) var(--sx-ease-standard);
}
#diagnostics-details[open] summary::after {
  transform: translateY(1px) rotate(-135deg);
}
#diagnostics-json {
  max-height: 260px;
  margin: 0 12px 12px;
  padding: 10px 12px;
  overflow: auto;
  font-family: inherit;
  font-size: 11px;
  line-height: 1.6;
  color: var(--sx-color-text);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  background: var(--sx-color-surface-subtle);
  border: 1px solid var(--sx-color-border-subtle);
  border-radius: var(--sx-radius-md);
}

/* ---- Workflow and supported profile --------------------------------------- */

.mvp-workflow {
  margin: 0 0 var(--sx-space-sm);
  padding: 10px 12px;
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-sm);
  color: var(--sx-color-dimmed);
  background: var(--sx-color-surface-subtle);
  border-radius: var(--sx-radius-md);
}
.mvp-workflow strong {
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-text);
}
.support-matrix {
  display: grid;
  gap: 2px;
  margin-bottom: var(--sx-space-sm);
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
}
.support-row {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 8px;
  padding: 8px 4px;
  border-bottom: 1px solid var(--sx-color-border-subtle);
}
.support-row .k {
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-text);
}
.support-row .v {
  color: var(--sx-color-dimmed);
}
.support-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 4px 0;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-medium);
  color: var(--sx-color-link);
  text-decoration: none;
}
.support-link:hover {
  text-decoration: underline;
}

/* ---- Element info: setting-row groups ------------------------------------- */

#info {
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-dimmed);
}
.info-group {
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--sx-color-surface-subtle);
  border-radius: var(--sx-radius-md);
}
.info-group:first-child {
  margin-top: 0;
}
.info-group-storey,
.info-group-material {
  background: var(--sx-color-selected-hover);
}
.info-group-gap {
  background: var(--sx-color-warning-light);
}
.info-group-title {
  padding-bottom: 4px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-text);
}
.info-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 8px;
  padding: 4px 0;
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  border-bottom: 1px solid var(--sx-color-border-subtle);
}
.info-group .info-row:last-child {
  border-bottom: none;
}
.info-row .k {
  color: var(--sx-color-dimmed);
}
.info-row .v {
  color: var(--sx-color-text);
  font-variant-numeric: tabular-nums;
  word-break: break-all;
  overflow-wrap: anywhere;
}
/* Measurements align on their decimal: tabular figures in the sans face. */
.info-row .v.num {
  word-break: normal;
}
.info-gap-note {
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-text);
}
.info-details > summary {
  list-style: none;
  cursor: pointer;
}
.info-details > summary::-webkit-details-marker {
  display: none;
}
.info-details > summary::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  margin: 0 8px 2px 1px;
  border: solid var(--sx-color-dimmed);
  border-width: 0 1.75px 1.75px 0;
  transform: rotate(-45deg);
  transition: transform var(--sx-duration-base) var(--sx-ease-standard);
}
.info-details[open] > summary::before {
  transform: rotate(45deg);
}
.info-details > summary:hover {
  color: var(--sx-color-primary);
}

.info-relations {
  display: grid;
  gap: 2px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--sx-color-border-subtle);
}
.info-relations-title {
  padding: 0 4px 2px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-text);
}
.info-relation {
  display: block;
  width: 100%;
  min-height: 30px;
  padding: 6px 8px;
  font: inherit;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-medium);
  color: var(--sx-color-link);
  text-align: left;
  background: none;
  border: 0;
  border-radius: var(--sx-radius-md);
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.info-layer {
  width: 100%;
  margin: 0;
  font: inherit;
  font-size: var(--sx-fs-xs);
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--sx-color-border-subtle);
  border-radius: 0;
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
.info-layer .k {
  color: var(--sx-color-link);
}
.info-layer:hover {
  background: var(--sx-color-selected-hover);
}
.info-layer[aria-pressed='true'] {
  background: var(--sx-color-selected);
}
.info-layer[aria-pressed='true'] .k {
  color: var(--sx-color-text);
}
.info-relation:hover {
  background: var(--sx-color-selected-hover);
}
.info-relation[aria-pressed='true'] {
  color: var(--sx-color-text);
  background: var(--sx-color-selected);
}

/* ---- Schedule: a compact table --------------------------------------------- */

.schedule-total {
  padding: 0 4px;
  font-size: var(--sx-fs-xs);
  line-height: var(--sx-lh-xs);
  color: var(--sx-color-dimmed);
  font-variant-numeric: tabular-nums;
}
.schedule-groups {
  display: grid;
}
.schedule-groups:not(:empty) {
  margin: 8px 0 4px;
  border-top: 1px solid var(--sx-color-border-subtle);
}
.schedule-row {
  display: grid;
  grid-template-columns: 1fr auto 60px;
  align-items: baseline;
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  font: inherit;
  font-size: var(--sx-fs-compact);
  text-align: left;
  color: var(--sx-color-text);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--sx-color-border-subtle);
}
.schedule-row .schedule-type {
  overflow: hidden;
  font-weight: var(--sx-fw-medium);
  text-overflow: ellipsis;
  white-space: nowrap;
}
.schedule-row .schedule-count {
  color: var(--sx-color-dimmed);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.schedule-row .schedule-verb {
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-medium);
  color: var(--sx-color-link);
  text-align: right;
}
button.schedule-row {
  cursor: pointer;
  transition: background-color var(--sx-duration-fast) var(--sx-ease-standard);
}
button.schedule-row:hover {
  background: var(--sx-color-selected-hover);
}
button.schedule-row[aria-pressed='true'] {
  background: var(--sx-color-selected);
}
button.schedule-row[aria-pressed='true'] .schedule-count {
  color: var(--sx-color-text);
}

/* ---- Accessibility ----------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -56px;
  left: 8px;
  z-index: var(--sx-z-max);
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 14px;
  font-size: var(--sx-fs-xs);
  font-weight: var(--sx-fw-semibold);
  color: var(--sx-color-primary-contrast);
  text-decoration: none;
  background: var(--sx-color-primary);
  border-radius: var(--sx-radius-xl);
}
.skip-link:focus {
  top: 13px;
}
/* One focus treatment: a 2px blue outline, offset 2px. */
:focus-visible {
  outline: var(--sx-focus-outline);
  outline-offset: 2px;
}
button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
summary:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
.tree-node:focus:not(:focus-visible),
.demo-card:focus:not(:focus-visible) {
  outline: none;
}

/* ---- Motion ------------------------------------------------------------------ */

@keyframes viewer-sweep {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(300%);
  }
}
@keyframes viewer-enter {
  from {
    opacity: 0;
    transform: translateY(2px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@keyframes viewer-toast-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@keyframes viewer-toast-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
    transform: translateY(4px);
  }
}
@keyframes viewer-settle {
  from {
    box-shadow: 0 0 0 0 rgba(24, 129, 255, 0.4);
  }
  to {
    box-shadow: 0 0 0 6px rgba(24, 129, 255, 0);
  }
}
@keyframes viewer-flag {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(24, 129, 255, 0);
  }
  40% {
    box-shadow: 0 0 0 2px var(--sx-color-primary);
  }
}

/* ---- Narrow screens ------------------------------------------------------------ */

@media (max-width: 960px) {
  body {
    overflow: auto;
  }
  #app {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto minmax(42vh, 52vh) auto;
    height: auto;
    min-height: 100vh;
  }
  header {
    flex-wrap: wrap;
    row-gap: 8px;
    height: auto;
    min-height: var(--sx-app-header-height);
    padding: 12px 16px;
  }
  #sidebar-left {
    order: 3;
    max-height: 36vh;
    border-right: none;
    border-top: 1px solid var(--sx-color-border-subtle);
    border-radius: 0;
  }
  #viewport {
    order: 2;
    min-height: 42vh;
    border-radius: var(--sx-app-sheet-radius) var(--sx-app-sheet-radius) 0 0;
  }
  #sidebar-right {
    order: 4;
    border-left: none;
    border-top: 1px solid var(--sx-color-border-subtle);
    border-radius: 0;
  }
  #demo-gallery {
    width: min(100%, 560px);
  }
}
@media (max-width: 560px) {
  header h1 {
    font-size: 15px;
  }
  header .meta {
    width: 100%;
  }
  #dropzone .big {
    font-size: var(--sx-h4);
  }
  .support-row,
  .status-row,
  .info-row {
    grid-template-columns: 1fr;
    gap: 2px;
  }
  /* The schedule keeps its columns: type and count belong on one line at
     any width, but the action word drops off. */
  .schedule-row {
    grid-template-columns: 1fr auto;
  }
  .schedule-row .schedule-verb {
    display: none;
  }
}

/* Reduced motion: every transition and animation collapses to instant. The
   progress rails stay as static filled bars so "working" is still legible. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }
  .demo-card:active:not(:disabled),
  header .export-btn:active:not(:disabled),
  .side-btn:active:not(:disabled),
  .note-btn:active,
  #pick-file:active {
    transform: none;
  }
  .sweep-rail::after,
  .demo-card[aria-busy='true']::after,
  #status.is-busy::after {
    width: 100%;
    animation: none;
    transform: none;
  }
}