/* Global reset so sizing is predictable everywhere. */
* {
  box-sizing: border-box;
}

/* Core design tokens for spacing, glass surfaces, and typography. */
:root {
  --app-bg: #eff2f7;
  --surface-radius: 22px;

  --island-gap: 16px;
  --edge-gap: 0px;
  --panel-width: 280px;
  --island-size: 44px;
  --tools-width: 225px;
  --tools-height: clamp(370px, 62vh, 640px);
  --edge-toggle-size: 22px;
  --edge-toggle-offset: 10px;
  --footer-height: 56px;
  --footer-left-clearance: calc(var(--tools-width) + var(--island-gap));
  --footer-right-clearance: calc(var(--panel-width) + var(--island-gap));

  --glass-blur: 12px;
  --glass-saturate: 140%;
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-header-bg: rgba(12, 18, 30, 0.48);
  --glass-border: rgba(255, 255, 255, 0.22);
  --glass-highlight: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.24) 0%,
    rgba(255, 255, 255, 0.06) 45%,
    rgba(255, 255, 255, 0) 70%
  );
  --glass-shadow-strong: 0 22px 48px rgba(6, 12, 24, 0.22),
    0 6px 16px rgba(6, 12, 24, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.32);
  --glass-shadow-soft: 0 14px 30px rgba(6, 12, 24, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);

  --glass-text: rgba(255, 255, 255, 0.92);
  --glass-text-muted: rgba(255, 255, 255, 0.72);
  --glass-text-faint: rgba(255, 255, 255, 0.6);

  --glass-control-bg: rgba(15, 23, 42, 0.32);
  --glass-control-border: rgba(255, 255, 255, 0.22);
  --glass-control-hover: rgba(255, 255, 255, 0.16);
  --glass-control-active: rgba(255, 255, 255, 0.24);
  --library-preview-bg: #232323;
}

/* Base page setup. */
body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  overflow-x: hidden;
  background: var(--app-bg);
}

/* App frame keeps the viewport fixed and layers UI islands above it. */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#editor-body {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow-x: hidden;
}

#viewport {
  position: fixed;
  inset: 0;
}

#viewport-canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: linear-gradient(180deg, #3d3d3d 0%, #303030 100%);
}

/* Shared glass treatment used by top-level islands/panels. */
.tools-stack,
#settings-island,
.undo-footer {
  border: 1px solid var(--glass-border);
  background-image: var(--glass-highlight);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  color: var(--glass-text);
}

/* Left tool island with transform/material controls. */
#tools-island {
  position: fixed;
  left: var(--edge-gap);
  bottom: var(--island-gap);
  width: var(--tools-width);
  height: min(var(--tools-height), calc(100vh - (var(--island-gap) * 2)));
  max-width: calc(100vw - (var(--island-gap) * 2));
  max-height: calc(100vh - (var(--island-gap) * 2));
  display: flex;
  flex-direction: column;
  transform: translate3d(var(--tools-shift-x, 0), 0, 0);
  transition: transform 0.35s ease;
  will-change: transform;
  z-index: 9;
}

.tools-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  height: 100%;
  padding: 12px 14px;
  border-radius: 0 18px 18px 0;
  background-color: var(--glass-bg);
  box-shadow: var(--glass-shadow-soft);
  max-height: none;
  overflow: hidden;
  scrollbar-width: none;
}

.tools-stack::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.tools-card {
  width: 100%;
  min-width: 0;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.tools-pane > .tools-card:last-child {
  border-bottom: none;
}

.tools-tabs {
  margin: 0;
  padding: 2px;
  display: flex;
  gap: 2px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  background: rgba(11, 16, 26, 0.28);
}

.tools-tab {
  flex: 1;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 6px 8px;
  background: transparent;
  color: var(--glass-text-faint);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.tools-tab:hover {
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  color: var(--glass-text);
}

.tools-tab.is-active {
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.2);
  color: var(--glass-text);
}

.tools-tab:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

.tools-panes {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.tools-pane {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

.tools-pane::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.tools-pane[hidden] {
  display: none !important;
}

/* The orientation gizmo sits in the upper-left overlay. */
#viewport-tools {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--tools-width);
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  pointer-events: none;
  z-index: 30;
}

#env-gizmo-canvas {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: block;
  background: transparent;
  border: none;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.35));
}

.env-gizmo-label {
  font-size: 0.75rem;
  color: var(--glass-text-muted);
}

/* Right panel stack contains the object sidebar plus manual button row. */
#panel-stack {
  position: fixed;
  top: var(--island-gap);
  right: var(--edge-gap);
  bottom: var(--island-gap);
  height: calc(100vh - (var(--island-gap) * 2));
  height: calc(100dvh - (var(--island-gap) * 2));
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  transform: translate3d(var(--panel-shift-x, 0), 0, 0);
  transition: transform 0.35s ease;
  will-change: transform;
  z-index: 10;
}

#panel {
  position: relative;
  width: var(--panel-width);
  max-width: 100%;
  flex: 1;
  min-height: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--glass-border);
  border-radius: var(--surface-radius) 0 0 0;
  background-color: var(--glass-bg);
  background-image: var(--glass-highlight);
  color: var(--glass-text);
  box-shadow: var(--glass-shadow-strong);
  overflow: hidden;
  overflow-x: hidden;
  scrollbar-width: none;
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
}

#panel-scroll {
  height: 100%;
  padding: 10px;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

#panel::-webkit-scrollbar,
#panel-scroll::-webkit-scrollbar,
.panel-pane::-webkit-scrollbar,
.history-scroll::-webkit-scrollbar,
.object-list-container::-webkit-scrollbar,
.object-list-scroll::-webkit-scrollbar {
  width: 0;
  height: 0;
}

#settings-island {
  width: var(--panel-width);
  height: var(--island-size);
  padding: 0;
  display: grid;
  place-items: center;
  border-top: none;
  border-radius: 0 0 0 var(--surface-radius);
  background-color: var(--glass-bg);
  box-shadow: var(--glass-shadow-soft);
  overflow: hidden;
}

#settings-island .island-action {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  color: var(--glass-text);
  cursor: pointer;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

#settings-island .island-action:hover {
  background: rgba(255, 255, 255, 0.08);
}

#settings-island svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Bottom footer for undo/redo and latest action text. */
.undo-footer {
  position: fixed;
  left: var(--footer-left-clearance);
  right: var(--footer-right-clearance);
  bottom: var(--island-gap);
  width: min(
    66vw,
    840px,
    calc(100vw - var(--footer-left-clearance) - var(--footer-right-clearance))
  );
  height: var(--footer-height);
  padding: 8px 18px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 18px;
  background-color: var(--glass-bg);
  box-shadow: var(--glass-shadow-soft);
  z-index: 11;
}

.undo-footer-content {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
}

.undo-footer-tool {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  grid-column: 1;
  gap: 10px;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--glass-text-muted);
  white-space: nowrap;
}

.undo-footer-label {
  color: var(--glass-text-faint);
}

.undo-footer-axis-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.undo-footer-axis {
  min-width: 2em;
  min-height: 24px;
  padding: 2px 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.25);
  color: var(--glass-text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.undo-footer-axis.is-active {
  background: rgba(255, 255, 255, 0.24);
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--glass-text);
}

.undo-footer-actions {
  display: inline-flex;
  align-items: center;
  justify-self: center;
  grid-column: 2;
  gap: 10px;
}

.undo-footer-recent {
  display: inline-flex;
  align-items: center;
  justify-self: end;
  grid-column: 3;
  gap: 10px;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--glass-text-muted);
  white-space: nowrap;
}

.undo-footer-button {
  min-height: 36px;
  padding: 8px 18px;
  border: 1px solid var(--glass-control-border);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.4);
  color: var(--glass-text);
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.undo-footer-button:hover {
  background: var(--glass-control-hover);
  border-color: rgba(255, 255, 255, 0.4);
}

.undo-footer-button:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

.undo-footer-value {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: none;
  color: var(--glass-text);
}

/* Body classes are toggled by the collapse buttons. */
body.left-panel-collapsed {
  --tools-shift-x: -100%;
  --footer-left-clearance: var(--edge-gap);
}

body.right-panel-collapsed {
  --panel-shift-x: 100%;
  --footer-right-clearance: var(--edge-gap);
}

/* Panel typography and top navigation row. */
#panel h1 {
  display: none;
}

#panel p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--glass-text);
}

#panel-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 10px;
  padding: 2px 2px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  background: transparent;
  box-shadow: none;
}

.panel-nav-title,
.panel-nav-link {
  text-decoration: none;
  text-transform: uppercase;
}

.panel-nav-title {
  color: var(--glass-text);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.panel-nav-link {
  color: var(--glass-text-muted);
  padding: 2px 7px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.panel-nav-title:hover,
.panel-nav-title:focus-visible,
.panel-nav-link:hover,
.panel-nav-link:focus-visible {
  color: var(--glass-text);
  text-decoration: none;
}

.panel-nav-link:hover,
.panel-nav-link:focus-visible {
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.12);
}

.panel-tabs {
  margin-bottom: 10px;
  padding: 2px;
  display: flex;
  gap: 2px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  background: rgba(11, 16, 26, 0.28);
  box-shadow: none;
}

.panel-tab {
  flex: 1;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 6px 8px;
  background: transparent;
  color: var(--glass-text-faint);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.panel-tab:hover {
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  color: var(--glass-text);
}

.panel-tab.is-active {
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.2);
  color: var(--glass-text);
  box-shadow: none;
}

.panel-panes {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.panel-pane {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

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

/* Shared labels and basic form layout in the right panel. */
.panel-heading,
#panel label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--glass-text);
}

#panel .panel-heading {
  width: 100%;
  text-align: center;
}

.panel-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.library-import {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.panel-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--glass-text);
}

.panel-toggle input[type="checkbox"] {
  width: 14px;
  height: 14px;
  accent-color: rgba(255, 255, 255, 0.9);
}

#panel .panel-text-input,
#panel input[type="file"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--glass-control-border);
  border-radius: 12px;
  background: var(--glass-control-bg);
  color: var(--glass-text);
  font-size: 0.75rem;
}

#panel .panel-text-input {
  border-radius: 10px;
}

#panel .panel-text-input:focus,
.input-row input:focus,
.color-hex-input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.55);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}

#panel .panel-text-input:disabled {
  cursor: not-allowed;
  color: rgba(255, 255, 255, 0.5);
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(15, 23, 42, 0.2);
}

#panel input[type="file"] {
  font-size: 0.8rem;
}

#panel input[type="file"]::file-selector-button {
  margin-right: 8px;
  padding: 4px 6px;
  border: 1px solid var(--glass-control-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.18);
  color: var(--glass-text);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.library-gallery-list::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.library-gallery-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.panel-pane--models:not([hidden]) {
  display: flex;
  flex-direction: column;
}

.panel-pane--models .panel-section--models {
  flex: 1;
  min-height: 0;
  gap: 12px;
  padding-top: 4px;
  border-bottom: none;
}

.panel-pane--models .library-import {
  flex: 1;
  min-height: 0;
}

.panel-header-row--models {
  align-items: flex-start;
}

#panel .panel-header-row--models .panel-heading {
  width: auto;
  text-align: left;
}

.library-gallery-empty {
  margin: 0;
  padding: 24px 14px;
  border: 1px dashed rgba(255, 255, 255, 0.24);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.24);
  text-align: center;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--glass-text-muted);
}

.library-tile {
  width: 100%;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow: hidden;
  text-align: left;
  cursor: pointer;
  background: rgba(15, 23, 42, 0.3);
  color: var(--glass-text);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: normal;
  text-transform: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.library-tile:hover:enabled {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.34);
  transform: translateY(-1px);
}

.library-tile:disabled {
  cursor: not-allowed;
  opacity: 0.82;
}

.library-tile.is-importing {
  border-color: rgba(103, 232, 249, 0.65);
  background: rgba(8, 145, 178, 0.28);
  cursor: wait;
}

.library-tile-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  opacity: 1;
  transition: transform 0.2s ease;
}

.library-tile:hover:enabled .library-tile-image {
  transform: scale(1.015);
}

.library-tile-name {
  padding: 9px 12px 10px;
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--glass-text-muted);
}

.library-tile-preview {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  background: var(--library-preview-bg);
}

/* Generic panel buttons share one glass control style. */
#panel button:not(.object-button):not(.object-delete):not(.mode-btn):not(.reset-btn):not(.library-tile):not(.panel-tab),
#panel .import-obj-button {
  border: 1px solid var(--glass-control-border);
  background: var(--glass-control-bg);
  color: var(--glass-text);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

#panel button:not(.object-button):not(.object-delete):not(.mode-btn):not(.reset-btn):not(.library-tile):not(.panel-tab) {
  padding: 8px 10px;
  border-radius: 12px;
}

#panel button:not(.object-button):not(.object-delete):not(.mode-btn):not(.reset-btn):not(.library-tile):not(.panel-tab):hover:enabled,
#panel .import-obj-button:hover {
  background: var(--glass-control-hover);
  border-color: rgba(255, 255, 255, 0.35);
}

#panel button:not(.object-button):not(.object-delete):not(.mode-btn):not(.reset-btn):not(.library-tile):not(.panel-tab):disabled {
  cursor: not-allowed;
  color: rgba(255, 255, 255, 0.45);
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(15, 23, 42, 0.2);
}

#panel button:focus-visible,
#panel input[type="file"]:focus-visible,
#panel select:focus-visible,
.object-button:focus-visible,
.object-delete:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

#panel .import-obj-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  cursor: pointer;
}

.import-obj-plus {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--glass-text);
}

.file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

#obj-delete {
  border-color: rgba(248, 113, 113, 0.55);
  background: rgba(248, 113, 113, 0.2);
}

#obj-clear-scene {
  border-color: rgba(251, 146, 60, 0.5);
  background: rgba(251, 146, 60, 0.2);
}

#obj-delete:disabled {
  background: rgba(148, 163, 184, 0.2);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.45);
}

#obj-clear-scene:disabled {
  background: rgba(148, 163, 184, 0.2);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.45);
}

#status,
.history-status,
#panel .muted {
  margin: 0;
  font-size: 0.75rem;
  color: var(--glass-text-muted);
}

.panel-divider {
  display: none;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.panel-section:last-of-type {
  border-bottom: none;
}

.panel-header-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.panel-header-row--objects {
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

#panel .panel-header-row--objects .panel-heading {
  width: auto;
  text-align: left;
}

.panel-header-row--objects .import-obj-button {
  margin-left: auto;
}

/* Compact action history block. */
.history-section {
  gap: 8px;
}

.history-header-row {
  align-items: flex-start;
}

#panel .history-header-row .panel-heading {
  width: auto;
  text-align: left;
}

.history-scroll {
  max-height: clamp(140px, 24vh, 220px);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  background-color: rgba(15, 23, 42, 0.2);
  scrollbar-width: none;
}

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

.history-item {
  padding: 4px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  color: var(--glass-text);
  font-size: 0.75rem;
}

.history-item:last-child {
  border-bottom: none;
}

.history-empty {
  color: var(--glass-text-faint);
  font-style: italic;
}

/* Scrollable object list and row states. */
.object-list-container {
  position: relative;
  width: calc(100% + 8px);
  height: 240px;
  margin: 0 -4px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 16px;
  background-color: rgba(15, 23, 42, 0.24);
  overflow: hidden;
}

.object-list-scroll {
  height: 100%;
  padding: 4px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

.object-list {
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  background: transparent;
}

.object-item {
  margin: 0;
  background: transparent;
}

.object-list-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  text-align: center;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.65);
  pointer-events: none;
}

.object-list-empty[hidden] {
  display: none;
}

.object-row {
  width: 100%;
  min-height: 20px;
  padding: 6px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-radius: 12px;
  background: transparent;
}

.object-row::before {
  content: "";
  width: 0;
  height: 0;
  margin-right: 4px;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid rgba(255, 255, 255, 0.55);
}

.object-row:hover {
  background: rgba(255, 255, 255, 0.08);
}

.object-row.multi-selected {
  background: rgba(255, 255, 255, 0.12);
  outline: 1px solid rgba(255, 255, 255, 0.32);
}

.object-row.multi-selected::before {
  border-left-color: rgba(255, 255, 255, 0.75);
}

.object-row:has(.object-button.active) {
  background: rgba(255, 255, 255, 0.16);
}

.object-row:has(.object-button.active):hover {
  background: rgba(255, 255, 255, 0.2);
}

.object-row:has(.object-button.active)::before {
  border-left-color: rgba(255, 255, 255, 0.9);
}

.object-row:has(.object-button.active) .object-delete {
  color: #fff;
}

.object-row:has(.object-button.active) .object-delete:hover,
.object-delete:hover {
  color: #dc2626;
}

.object-button {
  flex: 1;
  width: auto;
  padding: 0;
  border: none;
  border-radius: 0;
  appearance: none;
  -webkit-appearance: none;
  text-align: left;
  background: transparent;
  color: var(--glass-text);
  cursor: pointer;
  font-size: 0.8rem;
  letter-spacing: normal;
  text-transform: none;
}

.object-button.active {
  font-weight: 600;
}

.object-delete {
  width: 20px;
  height: 20px;
  margin-left: auto;
  padding: 4px;
  border: none;
  background-color: currentColor;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  outline: none;
  text-indent: -9999px;
  overflow: hidden;
  -webkit-mask: url("https://api.iconify.design/heroicons-outline/trash.svg") no-repeat center /
    16px 16px;
  mask: url("https://api.iconify.design/heroicons-outline/trash.svg") no-repeat center / 16px 16px;
}

/* Transform panel controls and split component actions. */
.transform-panel {
  width: 100%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--glass-text);
}

.transform-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 6px 0;
}

.transform-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.unit-indicator {
  margin: -2px 0 4px;
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--glass-text-faint);
}

.mode-buttons {
  display: flex;
  gap: 4px;
}

.mode-btn,
.split-btn,
.cancel-split-btn,
.combine-btn,
.reset-btn {
  border: 1px solid var(--glass-control-border);
  border-radius: 10px;
  background: var(--glass-control-bg);
  color: var(--glass-text);
  cursor: pointer;
  font-weight: 600;
  text-transform: uppercase;
  transition: all 0.2s ease;
}

.mode-btn {
  flex: 1;
  height: 34px;
  padding: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
}

.mode-btn:hover,
.split-btn:hover,
.cancel-split-btn:hover,
.combine-btn:hover,
.reset-btn:hover {
  background: var(--glass-control-hover);
  border-color: rgba(255, 255, 255, 0.4);
}

.mode-btn.active,
.split-btn:active,
.cancel-split-btn:active,
.combine-btn:active,
.reset-btn:active {
  background: var(--glass-control-active);
  border-color: rgba(255, 255, 255, 0.5);
}

.mode-btn:focus-visible,
.split-btn:focus-visible,
.cancel-split-btn:focus-visible,
.combine-btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

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

.split-btn,
.cancel-split-btn,
.combine-btn {
  min-height: 34px;
  padding: 6px 10px;
  font-size: 0.6rem;
  letter-spacing: 0.14em;
}

.split-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.combine-btn {
  width: 100%;
}

.split-label {
  font-size: 0.6rem;
  letter-spacing: 0.14em;
}

.split-hint {
  font-size: 0.55rem;
  letter-spacing: 0.12em;
  color: var(--glass-text-faint);
}

.split-hint:empty {
  display: none;
}

.combine-btn:disabled {
  cursor: not-allowed;
  color: rgba(255, 255, 255, 0.45);
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(15, 23, 42, 0.2);
}

.mode-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
  pointer-events: none;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  padding: 2px 0;
}

.input-row label {
  width: 20px;
  min-width: 20px;
  color: var(--glass-text);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.label-x {
  color: #ff0000;
}

.label-y {
  color: #00aa00;
}

.label-z {
  color: #0000ff;
}

.input-row input {
  flex: 1;
  min-width: 0;
  padding: 4px 6px;
  border: 1px solid var(--glass-control-border);
  border-radius: 10px;
  background: var(--glass-control-bg);
  color: var(--glass-text);
  font-size: 0.75rem;
  font-family: "Courier New", monospace;
}

.input-unit {
  min-width: 16px;
  color: var(--glass-text-muted);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reset-btn {
  margin-top: 0;
  padding: 6px 8px;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
}

.camera-panel {
  width: 100%;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: flex-start;
}

.camera-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.camera-axis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-areas:
    ". up ."
    "left front right"
    ". down ."
    ". back .";
  gap: 6px;
  width: 100%;
}

.camera-axis-btn {
  border: 1px solid var(--glass-control-border);
  border-radius: 10px;
  background: var(--glass-control-bg);
  color: var(--glass-text);
  cursor: pointer;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: background 0.2s ease, border-color 0.2s ease;
  min-height: 36px;
  padding: 6px 8px;
}

.camera-axis-btn.axis-x {
  border-color: rgba(239, 68, 68, 0.52);
  background: rgba(239, 68, 68, 0.2);
}

.camera-axis-btn.axis-y {
  border-color: rgba(34, 197, 94, 0.5);
  background: rgba(34, 197, 94, 0.18);
}

.camera-axis-btn.axis-z {
  border-color: rgba(59, 130, 246, 0.5);
  background: rgba(59, 130, 246, 0.18);
}

.camera-axis-btn.is-negative {
  color: rgba(255, 255, 255, 0.82);
}

.camera-axis-btn.axis-x.is-negative {
  border-color: rgba(239, 68, 68, 0.36);
  background: rgba(239, 68, 68, 0.1);
}

.camera-axis-btn.axis-y.is-negative {
  border-color: rgba(34, 197, 94, 0.36);
  background: rgba(34, 197, 94, 0.1);
}

.camera-axis-btn.axis-z.is-negative {
  border-color: rgba(59, 130, 246, 0.36);
  background: rgba(59, 130, 246, 0.1);
}

.camera-axis-btn:hover {
  border-color: rgba(255, 255, 255, 0.4);
}

.camera-axis-btn.axis-x:hover {
  border-color: rgba(248, 113, 113, 0.8);
  background: rgba(239, 68, 68, 0.26);
}

.camera-axis-btn.axis-y:hover {
  border-color: rgba(74, 222, 128, 0.78);
  background: rgba(34, 197, 94, 0.24);
}

.camera-axis-btn.axis-z:hover {
  border-color: rgba(96, 165, 250, 0.78);
  background: rgba(59, 130, 246, 0.24);
}

.camera-axis-btn.axis-x:active {
  background: rgba(239, 68, 68, 0.32);
}

.camera-axis-btn.axis-y:active {
  background: rgba(34, 197, 94, 0.3);
}

.camera-axis-btn.axis-z:active {
  background: rgba(59, 130, 246, 0.3);
}

.camera-axis-btn:active {
  background: var(--glass-control-active);
  border-color: rgba(255, 255, 255, 0.5);
}

.camera-axis-btn:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

/* Material panel controls for color, texture and sliders. */
.material-panel {
  width: 100%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--glass-text);
}

.section-title,
.material-label {
  color: var(--glass-text);
  font-weight: 600;
  text-transform: uppercase;
}

.section-title {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.25em;
}

.material-header {
  margin-bottom: 4px;
}

.material-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.material-label {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
}

.material-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.color-picker {
  width: 32px;
  height: 32px;
  padding: 2px;
  border: 1px solid var(--glass-control-border);
  border-radius: 4px;
  background: var(--glass-control-bg);
  cursor: pointer;
}

.color-picker::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.color-picker::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

.color-hex-input {
  flex: 1;
  min-width: 0;
  padding: 6px 10px;
  border: 1px solid var(--glass-control-border);
  border-radius: 8px;
  background: var(--glass-control-bg);
  color: var(--glass-text);
  font-size: 0.75rem;
  font-family: monospace;
}

.texture-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
}

.texture-input {
  display: none;
}

.texture-upload-label {
  width: 100%;
  min-height: 32px;
  padding: 8px 14px;
  border: 1px solid var(--glass-control-border);
  border-radius: 8px;
  background: var(--glass-control-bg);
  color: var(--glass-text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: background 0.15s, border-color 0.15s;
}

.texture-upload-label:hover {
  background: var(--glass-control-hover);
  border-color: rgba(255, 255, 255, 0.35);
}

.texture-preview-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.texture-preview {
  flex: 1;
  min-width: 0;
  padding: 6px 10px;
  border: 1px dashed rgba(255, 255, 255, 0.28);
  border-radius: 6px;
  background: rgba(15, 23, 42, 0.28);
  color: var(--glass-text);
  font-size: 0.7rem;
  text-align: left;
  overflow-wrap: anywhere;
}

.texture-preview.has-texture {
  border-style: solid;
  border-color: rgba(52, 211, 153, 0.7);
  background: rgba(16, 185, 129, 0.2);
}

.remove-texture-btn {
  padding: 4px 10px;
  border: 1px solid rgba(248, 113, 113, 0.45);
  border-radius: 6px;
  background: rgba(248, 113, 113, 0.18);
  color: var(--glass-text);
  cursor: pointer;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background 0.15s;
}

.remove-texture-btn:hover {
  background: rgba(248, 113, 113, 0.28);
}

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

.material-slider {
  flex: 1;
  height: 6px;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.2);
  outline: none;
  cursor: pointer;
}

.material-slider::-webkit-slider-thumb,
.material-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: #3b82f6;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.material-slider::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
}

.slider-value {
  min-width: 36px;
  color: var(--glass-text-muted);
  font-size: 0.7rem;
  font-family: monospace;
  text-align: right;
}

/* Side edge toggles for collapsing left/right islands. */
.edge-toggle {
  position: fixed;
  top: 50%;
  width: var(--edge-toggle-size);
  height: 56px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--glass-text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 500;
  transform: translateY(-50%);
  transition: transform 0.35s ease, left 0.35s ease, right 0.35s ease,
    background 0.2s ease, border-color 0.2s ease;
  backdrop-filter: blur(8px) saturate(120%);
  -webkit-backdrop-filter: blur(8px) saturate(120%);
  z-index: 12;
}

.edge-toggle:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.4);
}

.edge-toggle:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.7);
  outline-offset: 2px;
}

.edge-toggle-icon {
  line-height: 1;
  opacity: 0.8;
}

.edge-toggle-left {
  left: calc(var(--tools-width) + var(--edge-toggle-offset));
  border-radius: 999px;
}

.edge-toggle-right {
  right: calc(var(--panel-width) + var(--edge-toggle-offset));
  border-radius: 999px;
}

body.left-panel-collapsed .edge-toggle-left {
  left: var(--edge-gap);
}

body.right-panel-collapsed .edge-toggle-right {
  right: var(--edge-gap);
}

/* User manual modal and card presentation. */
body.manual-open {
  overflow: hidden;
}

.manual-modal {
  position: fixed;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: clamp(10px, 3vw, 24px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  background: rgba(7, 12, 22, 0.72);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  z-index: 50;
}

body.manual-open .manual-modal {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.manual-card {
  width: min(560px, 100%);
  max-height: calc(100vh - 24px);
  max-height: calc(100dvh - 24px);
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 14px;
  background: rgba(16, 20, 30, 0.96);
  color: var(--glass-text);
  box-shadow: 0 18px 48px rgba(5, 10, 20, 0.48);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(8px);
  transition: transform 0.2s ease;
}

body.manual-open .manual-card {
  transform: translateY(0);
}

.manual-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.06);
}

.manual-title {
  margin: 0 0 2px;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.manual-subtitle {
  margin: 0;
  font-size: 0.78rem;
  color: var(--glass-text-muted);
}

.manual-close {
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--glass-text);
  cursor: pointer;
  white-space: nowrap;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.manual-close:hover {
  background: rgba(255, 255, 255, 0.18);
}

.manual-content {
  padding: 12px 16px 16px;
  overflow-y: auto;
  min-height: 0;
  overscroll-behavior: contain;
}

.manual-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.manual-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
}

.manual-item-key {
  color: var(--glass-text);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.25;
}

.manual-item-action {
  color: var(--glass-text-muted);
  font-size: 0.84rem;
  line-height: 1.35;
}

/* Responsive tweaks keep islands usable across screen sizes. */
@media (max-width: 1440px) {
  :root {
    --panel-width: 260px;
    --tools-width: 210px;
    --island-gap: 14px;
  }
}

@media (max-width: 1280px) {
  :root {
    --panel-width: 240px;
    --tools-width: 200px;
    --island-gap: 12px;
  }

  .undo-footer {
    padding: 8px 12px;
  }

  .undo-footer-content {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    align-items: start;
    gap: 8px 12px;
  }

  .undo-footer-tool {
    grid-column: 1;
    grid-row: 1;
    white-space: normal;
  }

  .undo-footer-actions {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .undo-footer-recent {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: start;
    white-space: normal;
  }
}

@media (max-width: 1180px) {
  :root {
    --panel-width: 220px;
    --tools-width: 190px;
    --island-gap: 10px;
    --island-size: 40px;
  }

  .undo-footer-content {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .undo-footer-actions,
  .undo-footer-tool,
  .undo-footer-recent {
    justify-content: center;
    justify-self: stretch;
  }
}

@media (max-height: 900px) {
  #tools-island {
    max-height: 50vh;
  }

  .tools-stack {
    max-height: 50vh;
  }
}

@media (max-height: 800px) {
  :root {
    --island-gap: 10px;
  }

  #panel-scroll {
    padding: 8px;
  }

  .panel-section {
    gap: 8px;
    padding: 8px 0;
  }

  .object-list-container {
    height: 220px;
  }
}

@media (max-height: 680px) {
  #panel-scroll {
    padding: 6px;
  }

  .panel-section {
    gap: 6px;
    padding: 6px 0;
  }

  .object-list-container {
    height: 180px;
  }

  .history-scroll {
    padding: 4px;
  }
}

@media (max-width: 960px) {
  #viewport-tools {
    top: 0;
    left: 0;
    width: var(--tools-width);
  }

  #tools-island,
  #panel-stack {
    width: calc(100vw - (var(--edge-gap) * 2));
  }

  #panel-stack {
    left: var(--edge-gap);
    right: var(--edge-gap);
  }

  #panel,
  #settings-island {
    width: 100%;
  }

  #panel-scroll {
    max-height: calc(100vh - (var(--island-gap) * 3) - var(--island-size));
    max-height: calc(100dvh - (var(--island-gap) * 3) - var(--island-size));
  }

  .edge-toggle-left {
    left: var(--edge-gap);
  }

  .edge-toggle-right {
    right: var(--edge-gap);
  }

  .undo-footer {
    left: var(--edge-gap);
    right: var(--edge-gap);
    width: auto;
    height: auto;
    bottom: calc(var(--island-gap) + var(--island-size) + 12px);
    padding: 12px 14px;
    transform: none;
  }

  .undo-footer-content {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .undo-footer-actions,
  .undo-footer-tool,
  .undo-footer-recent {
    justify-content: center;
  }
}

@media (max-width: 720px) {
  .manual-modal {
    padding: 8px;
  }

  .manual-card {
    max-height: calc(100vh - 16px);
    max-height: calc(100dvh - 16px);
    border-radius: 12px;
  }

  .manual-header {
    flex-direction: column;
    align-items: stretch;
  }

  .manual-close {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .manual-modal,
  .manual-card {
    transition: none;
  }
}