:root {
  --bg: #faf9f5;
  --surface: #faf9f5;
  --surface-2: #f2efe3;
  --ink: #1f1e1d;
  --ink-2: #57544c;
  --ink-3: #8c897f;
  --line: #b3afa4;
  --line-2: #e6e2d6;
  --accent: #4f6d56;
  --accent-ink: #3f4b27;
  --danger: #9a3b2a;
  --caption1: #292b2a;
  --caption2: #3e4140;

  --serif: "Cormorant Garamond", "Source Serif 4", Georgia, serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Plus Jakarta Sans", "apple-system", "sans-serif";

  --panel-w: 360px;
  --header-h: 56px;

  color-scheme: light;
}

body.dark {
  --bg: #15140f;
  --surface: #15140f;
  --surface-2: #1f1d16;
  --ink: #f1ede0;
  --ink-2: #c0bba9;
  --ink-3: #7e7a6c;
  --line: #3f3c32;
  --line-2: #26241c;
  --accent: #9ab372;
  --accent-ink: #c8d8a3;
  --caption1: #95a39c;
  --caption2: #6d716f;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  transition:
    background 0.2s,
    color 0.2s;
}

/* Hide UI tied to a mode */
body:not(.mode-texture) .mode-texture-only {
  display: none !important;
}
body:not(.mode-glb) .mode-glb-only {
  display: none !important;
}

/* ============== TOP BAR ============== */
#top-bar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 14px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  z-index: 200;
  transition:
    background 0.2s,
    border-color 0.2s;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.brand-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  flex-shrink: 0;
}
.mode-pill {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  border: 1px solid var(--line);
  padding: 4px 10px;
  white-space: nowrap;
}
body.mode-texture .mode-pill::after {
  content: "Texture";
}
body.mode-glb .mode-pill::after {
  content: "Model";
}

.bar-sep {
  width: 1px;
  height: 20px;
  background: var(--line);
}
#subject-name {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0.01em;
  color: var(--ink);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#subject-name.placeholder {
  color: var(--ink-3);
  font-style: italic;
}

#cursor-coords {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  min-width: 168px;
  text-align: right;
  letter-spacing: 0.04em;
  transition: color 0.15s;
}
#cursor-coords.active {
  color: var(--ink);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ============== BUTTONS ============== */
.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: all 0.15s;
  border-radius: 0;
}
.btn:hover:not(:disabled) {
  border-color: var(--ink);
  color: var(--ink);
}
.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* Accent CTA — */
.btn.accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 500;
}
.btn.accent:hover:not(:disabled) {
  background: var(--accent-ink);
  border-color: var(--accent-ink);
  color: #fff;
}
body.dark .btn.accent {
  color: #15140f;
}
body.dark .btn.accent:hover:not(:disabled) {
  color: #15140f;
}

/* Theme button */
.btn .theme-glyph {
  display: inline-block;
  width: 8px;
  height: 8px;
  border: 1px solid currentColor;
  margin-right: 2px;
  background: #000;
}
body.dark .btn .theme-glyph {
  background: currentColor;
}

/* ============== SIDE PANEL ============== */
#panel {
  position: fixed;
  top: var(--header-h);
  left: 0;
  width: var(--panel-w);
  bottom: 0;
  background: var(--bg);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  z-index: 100;
}

/* ============ PAGED UI ============ */
.top-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.page-btn {
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  font-weight: 400;
  background: transparent;
  border: none;
  color: var(--ink-2);
  cursor: pointer;
  padding: 4px 0;
  letter-spacing: 0.01em;
  transition: color 0.15s;
}
.page-btn:hover:not(:disabled) {
  color: var(--ink);
}
.page-btn:disabled {
  opacity: 0.25;
  cursor: default;
}
.page-indicator {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-2);
}

.panel-inner {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px 22px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.panel-inner::-webkit-scrollbar {
  width: 6px;
}
.panel-inner::-webkit-scrollbar-thumb {
  background: var(--line);
}

/* Pages */
.page {
  display: none;
  animation: fadeIn 0.25s ease;
}
.page.active {
  display: block;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateX(8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Section headings in the pane */
.section {
  margin-bottom: 28px;
}
.section:last-child {
  margin-bottom: 0;
}
.section-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--ink);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.section-title .hint {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.05em;
  text-transform: none;
}

.panel-footer {
  padding: 14px 22px 18px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ============== DROP ZONE ============== */
.file-drop-zone {
  border: 1px dashed var(--line);
  background: transparent;
  cursor: pointer;
  padding: 14px 14px;
  text-align: center;
  position: relative;
  transition:
    border-color 0.15s,
    background 0.15s;
}
.file-drop-zone:hover,
.file-drop-zone.drag-over {
  border-color: var(--ink);
  background: var(--surface-2);
}
.file-drop-zone.loaded {
  border-style: solid;
  border-color: var(--line);
  background: var(--surface-2);
  padding: 12px 14px;
  text-align: left;
}
.file-drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.drop-text {
  pointer-events: none;
}
.drop-headline {
  display: block;
  font-family: var(--sans);
  font-style: italic;
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 4px;
}
.drop-meta {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.loaded-name {
  display: block;
  font-family: var(--sans); /*xxx*/
  font-style: italic;
  font-size: 10px;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.loaded-meta {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  margin-top: 4px;
}
.file-input-label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.normal-wrap {
  margin-top: 14px;
}

#fileStats {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line-2);
  line-height: 1.7;
}
#fileStats .stat-key {
  color: var(--ink-3);
}
#fileStats .stat-val {
  font-family: var(--sans);
  font-style: regular;
  font-size: 13px;
  color: var(--ink);
}
#fileStats.error {
  color: var(--danger);
}
#fileStats:empty,
#fileStats.empty {
  display: none;
}

/* ============== CONTROL ROWS ============== */
.ctrl-row {
  display: grid;
  grid-template-columns: 96px 1fr 56px;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.ctrl-row:last-child {
  margin-bottom: 0;
}
.ctrl-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}
.ctrl-val {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  text-align: right;
  letter-spacing: 0.02em;
}
.ctrl-sep {
  height: 1px;
  background: var(--line-2);
  margin: 14px 0;
}

/* Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  width: 100%;
  height: 14px;
  margin: 0;
  cursor: pointer;
}
input[type="range"]:disabled {
  cursor: not-allowed;
  opacity: 0.35;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--line);
}
input[type="range"]::-moz-range-track {
  height: 1px;
  background: var(--line);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: var(--ink);
  margin-top: -5.5px;
  border: none;
  cursor: pointer;
  transition: transform 0.1s;
}
input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: none;
  cursor: pointer;
}
input[type="range"]:hover::-webkit-slider-thumb {
  transform: scale(1.2);
}

/* ============== TOGGLE BUTTONS ============== */
.toggle-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 9px 12px;
  width: 100%;
  text-align: left;
  cursor: pointer;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.15s;
  border-radius: 0;
}
.toggle-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.toggle-btn.active {
  border-color: var(--ink);
  color: var(--ink);
  background: var(--surface-2);
}
.toggle-btn .btn-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--line);
  flex-shrink: 0;
  transition: background 0.15s;
}
.toggle-btn.active .btn-dot {
  background: var(--accent);
}

/* ============== SEGMENTED RADIO ============== */
.radio-group {
  display: flex;
  gap: 0;
  margin-bottom: 14px;
  border: 1px solid var(--line);
}
.radio-btn {
  appearance: none;
  flex: 1;
  border: none;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 4px;
  cursor: pointer;
  transition: all 0.12s;
  border-radius: 0;
}
.radio-btn:last-child {
  border-right: none;
}
.radio-btn:hover {
  color: var(--ink);
  background: var(--surface-2);
}
.radio-btn.active {
  background: var(--ink);
  color: var(--bg);
}

/* ============== COLOR + HEX ============== */
.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
input[type="color"] {
  appearance: none;
  -webkit-appearance: none;
  width: 32px;
  height: 22px;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  padding: 1px;
  border-radius: 0;
}
input[type="color"]:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}
input[type="color"]::-webkit-color-swatch {
  border: none;
}
.color-hex {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

/* ============== CANVAS / VIEWPORT ============== */
#canvas-container {
  position: fixed;
  top: var(--header-h);
  left: var(--panel-w);
  right: 0;
  bottom: 0;
  z-index: 1;
}
#canvas-container canvas {
  display: block;
}

#loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 50;
  opacity: 0;
  transition: opacity 0.2s;
}
#loading-overlay.visible {
  opacity: 1;
}
.loading-card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.loading-spinner {
  width: 14px;
  height: 14px;
  border: 1px solid var(--line);
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.loading-text {
  font-family: var(--serif);
  font-style: italic;
  font-size: 15px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}

.viewport-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  pointer-events: none;
  z-index: 2;
  color: var(--ink-3);
}
.viewport-empty.hide {
  display: none;
}
.empty-icon {
  width: 84px;
  height: 84px;
  border: 1px dashed var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
}
.empty-title {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 400;
  font-style: italic;
  color: var(--caption1);
  letter-spacing: 0.01em;
}
.empty-sub {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--caption2);
  max-width: 380px;
  text-align: center;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

.stats-pill {
  position: absolute;
  bottom: 18px;
  right: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-2);
  line-height: 1.7;
  letter-spacing: 0.04em;
  z-index: 3;
  display: none;
}
.stats-pill.visible {
  display: block;
}
.stats-pill .row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
}
.stats-pill .row span:first-child {
  color: var(--ink-3);
}

.help-bar {
  position: absolute;
  bottom: 18px;
  left: 18px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  line-height: 1.7;
  z-index: 2;
  pointer-events: none;
  max-width: 240px;
  letter-spacing: 0.02em;
}
.help-bar kbd {
  background: var(--surface-2);
  border: 1px solid var(--line);
  padding: 1px 5px;
  font-family: inherit;
  font-size: 9.5px;
  color: var(--ink-2);
}

/* ============== TRY-IT BUTTONS ============== */
.try-it {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  pointer-events: auto;
}
.try-it-label {
  font-family: var(--serif);
  font-style: italic;
  font-size: 28px;
  color: var(--caption2);
  letter-spacing: 0.02em;
}
.try-it-row {
  display: flex;
  gap: 10px;
}
.try-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  padding: 10px 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  transition: all 0.15s;
  border-radius: 0;
  text-align: left;
  min-width: 132px;
}
.try-btn:hover {
  border-color: var(--ink);
  background: var(--surface-2);
}
.try-btn-kind {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.try-btn-name {
  font-family: var(--sans);
  font-style: regular;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.2;
}

/* ============== TOASTS ============== */
.toast-wrap {
  position: fixed;
  top: calc(var(--header-h) + 18px);
  left: calc(var(--panel-w) + 50%);
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
}
.toast {
  background: var(--ink);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  opacity: 0;
  transform: translateY(-6px);
  transition: all 0.18s;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}
.toast.accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
body.dark .toast.accent {
  color: #15140f;
}
.toast.warn {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}