:root {
  color-scheme: dark;
  --bg: #101010;
  --panel: #171717;
  --panel-2: #202020;
  --field: #0f0f0f;
  --line: #3f3f3f;
  --line-soft: #292929;
  --text: #c9c9c9;
  --muted: #9a9a9a;
  --active: #8d8d8d;
  --active-strong: #a8a8a8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
  overflow-anchor: none;
  background: var(--bg);
  color: var(--text);
  font-family: "Menlo", "Monaco", "Courier New", monospace;
  font-size: 12px;
  line-height: 1.35;
}

:where(button, select, input[type="number"], .custom-select-button, .custom-select-option) {
  font-size: 11px;
}

button,
input,
select {
  font: inherit;
}

button,
select,
input[type="number"] {
  background: var(--field);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 0;
  min-height: 21px;
}

button {
  padding: 0 5px;
  line-height: 1.15;
  cursor: pointer;
}

button:hover,
button.active {
  border-color: var(--active);
  background: #232323;
  color: #d8d8d2;
}

select {
  width: 100%;
  padding: 0 6px;
}

.native-select-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.custom-select {
  position: relative;
  width: 100%;
  margin-top: 3px;
}

.custom-select-button {
  position: relative;
  width: 100%;
  min-height: 21px;
  padding: 0 20px 0 6px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--field);
  color: var(--text);
  text-align: left;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  cursor: pointer;
}

.custom-select-button::after {
  content: "v";
  position: absolute;
  right: 7px;
  top: 50%;
  transform: translateY(-54%);
  color: var(--muted);
  font-size: 9px;
}

.custom-select-button:hover,
.custom-select.open .custom-select-button {
  border-color: var(--active);
  background: #232323;
  color: #d8d8d2;
}

.custom-select-menu {
  position: fixed;
  z-index: 200;
  min-width: 120px;
  max-height: 260px;
  overflow: auto;
  border: 1px solid var(--active);
  background: #101010;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.48);
}

.custom-select-option {
  min-height: 21px;
  padding: 4px 7px;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.custom-select-option:hover,
.custom-select-option.active {
  background: #282828;
  color: #d8d8d2;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--active);
}

@media (hover: hover) and (pointer: fine) {
input[type="range"] {
  height: 15px;
  margin: 3px 0 0;
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid #4b4b4b;
  background:
    linear-gradient(90deg, #8d8d8d 0 var(--fill, 50%), #232323 var(--fill, 50%) 100%);
  box-shadow: 0 0 0 1px #080808 inset;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 13px;
  background: transparent;
  border: 0;
}

input[type="range"]::-webkit-slider-thumb {
  width: 0;
  height: 13px;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 0;
}

input[type="range"]::-moz-range-track {
  height: 13px;
  background: transparent;
  border: 0;
}

input[type="range"]::-moz-range-thumb {
  width: 0;
  height: 13px;
  border: 0;
  background: transparent;
}

input[type="range"]:hover,
input[type="range"]:focus-visible {
  border-color: var(--active);
  background:
    linear-gradient(90deg, #b6b6b6 0 var(--fill, 50%), #2e2e2e var(--fill, 50%) 100%);
}
}

@media (hover: none), (pointer: coarse), (max-width: 780px) {
  input[type="range"] {
    min-height: 28px;
  }
}

.app {
  height: 100vh;
  height: 100dvh;
  min-height: 0;
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  overscroll-behavior: none;
  overflow-anchor: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 10px 10px 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: var(--panel);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
}

h2 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 28px;
  margin: -7px -7px 7px;
  padding: 0 6px 0 8px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--line-soft);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: #cfcfcf;
}

.topbar p,
.hint {
  color: var(--muted);
}

.topbar p {
  margin-top: 2px;
}

.top-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 4px;
}

.compact-control {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 2px;
  color: #aeb7bd;
  white-space: nowrap;
}

.compact-control .custom-select {
  width: 116px;
  margin: 0;
}

.compact-control select {
  width: 116px;
  margin: 0;
}

.seed-control input {
  width: 76px;
  margin: 0;
  padding: 0 5px;
}

.generate-bias {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 190px;
  margin: 0 2px;
  color: #aeb7bd;
  font-size: 11px;
}

.generate-bias input {
  width: 118px;
  margin: 0;
}

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(460px, 1fr) 318px;
  min-height: 0;
  overflow: hidden;
  overscroll-behavior: none;
  overflow-anchor: none;
}

.panel {
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow: auto;
  min-height: 0;
  overscroll-behavior: contain;
  overflow-anchor: none;
}

.panel.tools {
  border-right: 0;
  border-left: 1px solid var(--line);
}

.panel section {
  margin: 6px;
  padding: 7px;
  background: #141414;
  border: 1px solid var(--line-soft);
}

.panel section + section {
  margin-top: 6px;
}

.section-toggle {
  display: none;
}

.collapsible > h2 {
  cursor: pointer;
  user-select: none;
}

.collapsible > h2::after {
  content: "-";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  margin-left: 8px;
  border: 1px solid var(--line-soft);
  background: var(--field);
  color: var(--muted);
  font-weight: 400;
}

.collapsible > h2:hover::after,
.collapsible > h2:focus-visible::after {
  border-color: var(--active);
  color: var(--text);
}

.collapsible.collapsed {
  padding-bottom: 0;
}

.collapsible.collapsed h2 {
  margin-bottom: 0;
  border-bottom: 0;
}

.collapsible.collapsed > h2::after {
  content: "+";
}

.collapsible.collapsed > :not(h2) {
  display: none;
}

label {
  display: block;
  margin: 5px 0;
  color: var(--muted);
}

label input,
label select {
  margin-top: 3px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 22px;
}

.check-row input {
  margin: 0;
}

.stage {
  min-width: 0;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  overflow-anchor: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 14px;
  background:
    linear-gradient(#171717 1px, transparent 1px),
    linear-gradient(90deg, #171717 1px, transparent 1px),
    #0d0d0d;
  background-size: 20px 20px;
}

.view-tabs {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  width: min(100%, 900px);
}

.button-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin: 6px 0 10px;
}

.group-nav {
  display: none;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 6px;
  width: min(100%, 900px);
  align-items: stretch;
}

.group-strip {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 4px;
  min-width: 0;
}

.group-chip {
  min-height: 38px;
  padding: 3px 4px;
  color: #aeb6bb;
  text-align: left;
}

.group-chip span,
.group-chip small {
  display: block;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.group-chip span {
  color: #c9c9c9;
  font-size: 11px;
}

.group-chip small {
  color: #8f9aa0;
  font-size: 9px;
  line-height: 1.15;
}

.group-chip.active {
  border-color: var(--active-strong);
  background: #282828;
}

.group-chip.active span {
  color: #d8d8d2;
}

.canvas-frame {
  position: relative;
  width: min(100%, 900px);
  aspect-ratio: 900 / 560;
  border: 1px solid #4a5259;
  background: #050607;
  box-shadow: 0 0 0 1px #000 inset, 0 0 0 2px #171717;
}

#roomSvg,
#roomCanvas {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#roomSvg {
  z-index: 1;
  background: #050607;
  pointer-events: none;
}

#roomCanvas {
  z-index: 2;
  cursor: crosshair;
}

.canvas-frame.svg-active #roomCanvas {
  opacity: 0;
}

.canvas-frame:not(.svg-active) #roomSvg {
  display: none;
}

.readout-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  width: min(100%, 900px);
}

.readout-grid div {
  padding: 7px;
  border: 1px solid var(--line);
  background: #141414;
}

.readout-grid span {
  display: block;
  color: var(--muted);
  font-size: 10px;
}

.readout-grid strong {
  display: block;
  margin-top: 2px;
  font-size: 13px;
}

.group-readout {
  display: grid;
  gap: 6px;
}

.group-readout div {
  padding: 6px;
  border: 1px solid var(--line-soft);
  background: #0f0f0f;
}

.group-readout span {
  display: block;
  color: var(--muted);
  font-size: 10px;
}

.group-readout strong {
  display: block;
  margin-top: 2px;
  color: #cfcfc9;
  font-size: 11px;
}

#timelineCanvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 512 / 180;
  border: 1px solid #4a5259;
  background: #050607;
  touch-action: none;
}

#jsonPreview {
  max-height: 340px;
  margin: 0;
  padding: 8px;
  overflow: auto;
  border: 1px solid var(--line);
  background: #0f0f0f;
  color: #b8d8e8;
  font-size: 10px;
  white-space: pre-wrap;
}

.gltf-modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: none;
  padding: 24px;
  background: rgba(8, 8, 8, 0.82);
}

.gltf-modal.open {
  display: flex;
  align-items: center;
  justify-content: center;
}

.gltf-panel {
  width: min(1180px, 96vw);
  max-height: 94vh;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  background: #121212;
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.54);
}

.gltf-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 10px;
  border-bottom: 1px solid var(--line);
  background: #181818;
}

.gltf-head h2 {
  margin: 0 0 4px;
  padding: 0;
  border: 0;
  background: transparent;
  min-height: 0;
  cursor: default;
}

.gltf-head h2::after {
  display: none;
}

.gltf-head p {
  color: var(--muted);
}

.gltf-camera {
  min-width: min(440px, 42vw);
  display: grid;
  grid-template-columns: repeat(3, minmax(92px, 1fr));
  gap: 6px 8px;
  align-items: end;
}

.gltf-camera label {
  margin: 0;
  font-size: 10px;
}

.gltf-camera input {
  margin-top: 3px;
}

.gltf-presets {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.gltf-actions {
  display: flex;
  gap: 8px;
}

#gltfCanvas {
  display: block;
  width: 100%;
  height: min(72vh, 720px);
  background: #050607;
}

@media (max-width: 1080px) {
  .gltf-head {
    align-items: stretch;
    flex-direction: column;
  }

  .gltf-camera {
    width: 100%;
    min-width: 0;
  }

  .workspace {
    grid-template-columns: 250px minmax(360px, 1fr) 290px;
  }
}

@media (max-width: 780px) {
  body {
    overflow: auto;
  }

  .app {
    height: auto;
    min-height: 100vh;
    display: block;
    overflow: visible;
  }

  .topbar,
  .workspace {
    display: block;
  }

  .topbar {
    margin: 10px;
  }

  .top-actions {
    justify-content: flex-start;
    margin-top: 12px;
  }

  .panel {
    border-right: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    overflow: visible;
  }

  .stage {
    overflow: visible;
  }

  .view-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .view-tabs button {
    min-height: 30px;
  }

  .readout-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Compact toolbox controls; keep the room and reflection drawings at full scale. */
.panel {
  font-size: 10px;
}

.panel section {
  margin: 5px;
  padding: 6px;
}

.panel section + section {
  margin-top: 5px;
}

.panel h2 {
  min-height: 23px;
  margin: -6px -6px 6px;
  padding: 0 5px 0 6px;
  font-size: 10px;
}

.panel .collapsible > h2::after {
  width: 15px;
  height: 15px;
  margin-left: 6px;
}

.panel label {
  margin: 4px 0;
  font-size: 10px;
}

.panel label input,
.panel label select {
  margin-top: 2px;
}

.panel button,
.panel select,
.panel input[type="number"],
.panel .custom-select-button,
.panel .custom-select-option {
  min-height: 18px;
  padding-left: 5px;
  padding-right: 5px;
  font-size: 10px;
}

.panel .custom-select,
.panel .custom-select-button,
.panel input[type="range"] {
  margin-top: 2px;
}

.panel .custom-select-button {
  padding-right: 18px;
}

.panel .custom-select-option {
  padding-top: 3px;
  padding-bottom: 3px;
}

.panel input[type="range"] {
  height: 13px;
}

.panel .check-row {
  gap: 6px;
  min-height: 19px;
}

.panel .button-row {
  gap: 3px;
  margin: 5px 0 8px;
}

@media (hover: hover) and (pointer: fine) {
  .panel input[type="range"]::-webkit-slider-runnable-track,
  .panel input[type="range"]::-webkit-slider-thumb,
  .panel input[type="range"]::-moz-range-track,
  .panel input[type="range"]::-moz-range-thumb {
    height: 11px;
  }
}

/* s3g-mc browser utility convergence layer */
.topbar,
.panel,
.readout-grid div,
.group-readout div,
.gltf-panel,
.gltf-head {
  background: var(--panel);
}

.panel {
  padding: 5px;
  font-size: 10px;
}

.panel section {
  position: relative;
  margin: 5px;
  padding: 6px;
  border: 0;
  background: #141414;
}

.panel section::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: #c9c9c2;
  opacity: 0.58;
  pointer-events: none;
}

.panel h2 {
  min-height: 23px;
  margin: -6px -6px 6px;
  padding: 0 5px 0 6px;
  border-bottom: 0;
  background: #0f0f0f;
  color: #bdbdb8;
  font-size: 10px;
  font-weight: 400;
}

.panel .collapsible > h2::after {
  width: 15px;
  height: 15px;
  margin-left: 6px;
  border-color: var(--line-soft);
  background: var(--field);
}

.panel label {
  margin: 4px 0;
  color: var(--muted);
  font-size: 10px;
}

button,
.custom-select-button {
  background: #0b0b0b;
}

button {
  text-transform: uppercase;
}

button:hover,
button.active,
.custom-select-button:hover,
.custom-select.open .custom-select-button {
  border-color: #555;
  background: #111;
  color: #d8d8d2;
}

.group-chip.active {
  border-color: #777;
  background: #202020;
}

.group-chip.active span {
  color: #d8d8d2;
}

.panel button,
.panel select,
.panel input[type="number"],
.panel .custom-select-button,
.panel .custom-select-option {
  min-height: 18px;
  padding-left: 5px;
  padding-right: 5px;
  font-size: 10px;
}

.panel .custom-select-button {
  padding-right: 18px;
}

@media (hover: hover) and (pointer: fine) {
  input[type="range"],
  input[type="range"]:hover,
  input[type="range"]:focus-visible {
    border-color: #4b4b4b;
    background:
      linear-gradient(90deg, #8d8d8d 0 var(--fill, 50%), #232323 var(--fill, 50%) 100%);
  }
}