style.css

/* ── Reset & tokens ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #111114;
  --surface:      #1a1a1f;
  --surface2:     #222228;
  --border:       #2e2e38;
  --accent:       #7c6aff;
  --accent-hover: #9b8dff;
  --text:         #e0e0e8;
  --text-muted:   #888899;
  --danger:       #ff5f5f;
  --success:      #4ade80;
  --radius:       8px;
  --sidebar-w:    380px;
  --header-h:     48px;
}

[data-theme="light"] {
  --bg:           #f0f0f5;
  --surface:      #ffffff;
  --surface2:     #eaeaf2;
  --border:       #d0d0df;
  --accent:       #6355e0;
  --accent-hover: #7c6aff;
  --text:         #1a1a2e;
  --text-muted:   #66667a;
  --danger:       #d93025;
  --success:      #1a7f3c;
}

/* ── Header actions (language selector + theme toggle) ──────────────── */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.lang-seg {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
}

.lang-dropdown {
  height: 28px;
  padding: 0 24px 0 10px; /* Add right padding for default select arrow if present */
  background: var(--surface2);
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  appearance: none; /* Attempt to remove default styling */
  -moz-appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='5' viewBox='0 0 8 5'%3E%3Cpath fill='%2366667a' d='M0 0l4 4 4-4H0z'/%3E%3C/svg%3E"); /* Custom arrow */
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: background 0.15s, color 0.15s;
}

.lang-dropdown:hover {
  color: var(--accent);
}

.lang-dropdown:focus {
  outline: none;
}

/* ── Theme toggle button ─────────────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  padding: 0 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun  { display: block; }

.github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}
.github-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

/* ── Header ─────────────────────────────────────────────────────────── */
header {
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  position: relative;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
}

.header-note {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
}

/* ── Main layout ─────────────────────────────────────────────────────── */
main {
  display: flex;
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}

/* ── 3-D Viewport section ────────────────────────────────────────────── */
#brush-cursor {
  display: none;
  position: fixed;
  pointer-events: none;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.5);
  z-index: 1000;
  transform: translate(0, 0);
}

#viewport-section {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.drop-zone {
  flex: 1 1 0;
  position: relative;
  overflow: hidden;
}

.drop-zone.drag-over::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px dashed var(--accent);
  border-radius: var(--radius);
  pointer-events: none;
  background: rgba(124, 106, 255, 0.06);
}

.drop-hint {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.6;
  pointer-events: none;
  transition: opacity 0.2s;
}

.drop-hint.hidden { opacity: 0; pointer-events: none; }

.link-label {
  color: var(--accent);
  cursor: pointer;
  pointer-events: all;
  text-decoration: underline;
}

#viewport {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
}

#store-cta-wrapper {
  position: absolute;
  bottom: 14px;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 20;
  pointer-events: none;
  /* relative so the dismiss button can be positioned against the anchor */
}
#store-cta {
  display: block;
  position: relative;
  padding: 10px 18px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 8px;
  box-shadow: none;
  pointer-events: all;
  white-space: nowrap;
  transition: background 0.15s, transform 0.15s;
  letter-spacing: 0.01em;
}
#store-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}
#store-cta a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}
#store-cta a:hover {
  opacity: 0.85;
}
#store-cta-dismiss {
  background: none;
  border: none;
  color: #fff;
  font-size: 11px;
  line-height: 1;
  cursor: pointer;
  opacity: 0.7;
  padding: 0 2px;
  margin-left: 8px;
  font-weight: bold;
  vertical-align: top;
  position: relative;
  top: -4px;
  transition: opacity 0.15s;
}
#store-cta-dismiss:hover {
  opacity: 1;
}
.store-cta-hidden {
  display: none !important;
}

#viewport-footer {
  height: 28px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 16px;
  flex-shrink: 0;
}

.mesh-info {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.viewport-controls-hint {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
}

.wireframe-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.place-on-face-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  padding: 6px 10px;
  user-select: none;
  font-family: inherit;
  white-space: nowrap;
}
.place-on-face-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}
.place-on-face-btn.active {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Rotate controls ──────────────────────────────────────────────────── */
.rotate-controls {
  margin-top: 6px;
}
.rotate-controls.hidden {
  display: none;
}
.rotate-inputs-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.rotate-input-group {
  display: flex;
  align-items: center;
  gap: 3px;
}
.rotate-input-group label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  min-width: 16px;
}
.rotate-input-group input {
  width: 52px;
  font-size: 11px;
}
.rotate-apply-btn,
.rotate-reset-btn {
  font-size: 11px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
}
.rotate-apply-btn:hover,
.rotate-reset-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.load-stl-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
  flex-wrap: wrap;
}

/* ── Settings panel ──────────────────────────────────────────────────── */
#settings-panel {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#settings-panel::-webkit-scrollbar { width: 5px; }
#settings-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.panel-section h2 {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.panel-subsection-heading {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 14px 0 8px;
}

/* ── Advanced / Beta Features (collapsible) ──────────────────────────── */
.advanced-toggle {
  cursor: pointer;
  user-select: none;
  margin-bottom: 0 !important;
  display: flex;
  align-items: center;
  gap: 4px;
}

.advanced-chevron {
  display: inline-block;
  transition: transform 0.15s ease;
  font-size: 9px;
  line-height: 1;
}

.advanced-section:not(.collapsed) .advanced-chevron {
  transform: rotate(90deg);
}

.advanced-section:not(.collapsed) .advanced-toggle {
  margin-bottom: 10px !important;
}

.advanced-section.collapsed .advanced-content {
  display: none;
}

.advanced-blurb {
  font-size: 11px;
  color: var(--text-muted);
  margin: 0 0 10px;
  line-height: 1.4;
}

.advanced-section .panel-subsection-heading:first-of-type {
  margin-top: 6px;
}

.bake-mask-row {
  margin-bottom: 10px;
}

.bake-mask-row .checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
}

/* ── Preset grid ─────────────────────────────────────────────────────── */
.preset-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 3px;
  margin-bottom: 10px;
}

.preset-swatch {
  aspect-ratio: 1;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.15s, transform 0.1s;
  position: relative;
}

.preset-swatch:hover { border-color: var(--text-muted); transform: scale(1.04); }
.preset-swatch.active { border-color: var(--accent); }

.preset-swatch canvas {
  width: 100%;
  height: 100%;
  display: block;
  image-rendering: pixelated;
}

.preset-swatch .preset-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.6);
  color: #fff;
  font-size: 8px;
  text-align: center;
  padding: 1px 0;
  opacity: 0;
  transition: opacity 0.15s;
}

.preset-swatch:hover .preset-label { opacity: 1; }

/* ── Preset loading states ────────────────────────────────────────────── */

@keyframes preset-swatch-shimmer {
  0%   { opacity: .15; }
  50%  { opacity: .30; }
  100% { opacity: .15; }
}

.preset-swatch.preset-loading canvas {
  background: var(--border);
  animation: preset-swatch-shimmer 1.2s ease-in-out infinite;
}

.preset-swatch.preset-loading-full::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.35);
  border-radius: var(--radius);
  pointer-events: none;
}

@keyframes spin-loader {
  to { transform: translate(-50%,-50%) rotate(360deg); }
}

.preset-swatch.preset-loading-full::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  transform: translate(-50%,-50%);
  animation: spin-loader .6s linear infinite;
  z-index: 1;
}

/* ── Custom upload button ─────────────────────────────────────────────── */
.upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s, border-color 0.15s;
}

.upload-btn:hover {
  background: var(--border);
  border-color: var(--accent);
}

.active-map-name {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
  word-break: break-all;
}

/* ── Form rows ───────────────────────────────────────────────────────── */
.form-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.form-row:last-child { margin-bottom: 0; }

.form-row label,
.form-row .form-row-label {
  flex: 0 0 80px;
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
}

.form-row select {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 5px 8px;
  font-size: 12px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23888'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  cursor: pointer;
}

.form-row select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Sliders ─────────────────────────────────────────────────────────── */
.slider-row { align-items: center; }

.slider-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  cursor: pointer;
  outline: none;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: grab;
  transition: background 0.15s;
}

.slider-row input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; background: var(--accent-hover); }
.slider-row input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: none; cursor: grab;
}

.val {
  flex: 0 0 52px;
  text-align: right;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}
input[type="number"].val {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 2px 6px;
  cursor: text;
  box-sizing: border-box;
  min-width: 0;
  -moz-appearance: textfield;
}
input[type="number"].val::-webkit-inner-spin-button,
input[type="number"].val::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"].val:focus { outline: none; border-color: var(--accent); }

/* ── Hint text ───────────────────────────────────────────────────────── */
.hint {
  font-size: 10px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 6px;
  margin-bottom: 10px;
}

/* ── Export progress ─────────────────────────────────────────────────── */
.export-progress {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  margin-bottom: 10px;
  font-size: 11px;
  color: var(--text-muted);
}

.export-progress.hidden { display: none; }

.export-progress-track {
  position: relative;
  height: 14px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 6px;
}

.export-progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
}

.export-progress-pct {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
  color: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
}

[data-theme="light"] .export-progress-pct {
  mix-blend-mode: normal;
  color: #fff;
  text-shadow: 0 0 4px rgba(0,0,0,0.5);
}

/* ── Export button ───────────────────────────────────────────────────── */
.export-btn {
  width: 100%;
  padding: 9px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.export-btn:hover:not(:disabled) { background: var(--accent-hover); }
.export-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.export-btn.busy { opacity: 0.7; pointer-events: none; }

/* Row containing Export STL and Export 3MF side-by-side */
.export-buttons {
  display: flex;
  gap: 8px;
}
.export-buttons .export-btn {
  flex: 1 1 0;
  width: auto;
  min-width: 0;
}
/* ── Lock / proportional-scale button ───────────────────────────────────── */
.lock-btn {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.lock-btn.active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface2));
  border-color: var(--accent);
  color: var(--accent);
}

.lock-btn:hover { border-color: var(--accent-hover); }

/* ── Lock row connector ───────────────────────────────────────────────────────── */
.lock-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 2px 0;
}

.lock-line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Triangle limit warning ──────────────────────────────────────────────── */
.tri-limit-warning {
  background: color-mix(in srgb, #f59e0b 15%, var(--surface2));
  border: 1px solid #f59e0b;
  color: #f59e0b;
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 11px;
  line-height: 1.4;
  margin-bottom: 8px;
}

.tri-limit-warning.hidden { display: none; }

/* ── Amplitude overlap warning ────────────────────────────────────────────────────────────── */
.amplitude-warning {
  background: color-mix(in srgb, var(--danger) 12%, var(--surface2));
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 11px;
  line-height: 1.4;
  margin-top: 4px;
  margin-bottom: 2px;
}

.amplitude-warning.hidden { display: none; }

/* Red highlight on slider + number input when amplitude is dangerously high */
#amplitude.amp-danger, #amplitude-val.amp-danger {
  accent-color: var(--danger);
  border-color: var(--danger);
  outline: 1px solid var(--danger);
  color: var(--danger);
}

/* ── Resolution too coarse warning ────────────────────────────────────────── */
.resolution-warning {
  background: color-mix(in srgb, #f59e0b 15%, var(--surface2));
  border: 1px solid #f59e0b;
  color: #f59e0b;
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 11px;
  line-height: 1.4;
  margin-top: 4px;
  margin-bottom: 8px;
}

.resolution-warning.hidden { display: none; }

/* Orange highlight on slider + number input when resolution is too coarse */
#refine-length.res-warn, #refine-length-val.res-warn {
  accent-color: #f59e0b;
  border-color: #f59e0b;
  outline: 1px solid #f59e0b;
  color: #f59e0b;
}

/* ── Smart-resolution button + diagnostic ──────────────────────────────────── */
.smart-res-btn {
  display: block;
  width: 100%;
  margin-bottom: 6px;
  padding: 7px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.smart-res-btn:hover:not(:disabled) {
  border-color: var(--accent-hover);
  color: var(--text);
}
.smart-res-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.smart-res-info {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 4px;
  margin-bottom: 6px;
  line-height: 1.45;
}
.smart-res-info.hidden { display: none; }
.smart-res-info .clamped {
  color: #f59e0b;
}

/* ── Cylinder axis inset panel ─────────────────────────────────────────── */

.cylinder-panel {
  position: absolute;
  top: 14px;
  left: 14px;
  width: 240px;
  height: 276px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  z-index: 22;
  pointer-events: all;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  user-select: none;
  display: flex;
  flex-direction: column;
}

.cylinder-panel.hidden { display: none; }

.cylinder-panel canvas {
  display: block;
  width: 240px;
  height: 240px;
  cursor: grab;
  touch-action: none;
}

/* Width stays the same when minimized; only the canvas collapses away. */
.cylinder-panel.minimized { height: auto; }
.cylinder-panel.minimized canvas { display: none; }

.cylinder-panel-label {
  font-size: 10px;
  color: var(--text-muted);
  padding: 6px 8px;
  flex: 1;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 24px;
}

.cylinder-panel-minimize {
  width: 18px;
  height: 18px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  flex-shrink: 0;
}
.cylinder-panel-minimize:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
/* Toggle which icon is visible based on the panel's minimized state. */
.cylinder-panel-minimize .icon-expand   { display: none; }
.cylinder-panel.minimized .cylinder-panel-minimize .icon-minimize { display: none; }
.cylinder-panel.minimized .cylinder-panel-minimize .icon-expand   { display: inline-block; }

.cylinder-axis-controls {
  display: flex;
  gap: 6px;
  flex: 1;
}

.cylinder-axis-btn {
  flex: 1;
  padding: 4px 8px;
  font-size: 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
}
.cylinder-axis-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── Mesh diagnostics popup ────────────────────────────────────────────── */

.mesh-diagnostics {
  position: absolute;
  bottom: 14px;
  left: 14px;
  z-index: 20;
  max-width: 380px;
  border-radius: var(--radius);
  padding: 10px 28px 10px 14px;
  font-size: 12px;
  line-height: 1.5;
  pointer-events: all;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  transition: top 0.2s, bottom 0.2s, left 0.2s, right 0.2s;
}

.mesh-diagnostics.diag-corner-tr {
  bottom: auto;
  left: auto;
  top: 14px;
  right: 14px;
}

.mesh-diagnostics.hidden { display: none; }

/* Severity themes — applied directly to the popup container */
.mesh-diagnostics.diag-ok {
  background: color-mix(in srgb, #22c55e 12%, var(--surface2));
  border: 1px solid #22c55e;
  color: #22c55e;
}

.mesh-diagnostics.diag-warn {
  background: color-mix(in srgb, #f59e0b 15%, var(--surface2));
  border: 1px solid #f59e0b;
  color: #f59e0b;
}

.mesh-diagnostics.diag-error {
  background: color-mix(in srgb, var(--danger) 12%, var(--surface2));
  border: 1px solid var(--danger);
  color: var(--danger);
}

.mesh-diag-results { white-space: pre-line; }
.mesh-diag-results.hidden { display: none; }

.mesh-diag-dismiss {
  position: absolute;
  top: 4px;
  right: 6px;
  background: none;
  border: none;
  color: inherit;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  opacity: 0.6;
  padding: 2px 4px;
}

.mesh-diag-dismiss:hover { opacity: 1; }

.mesh-diagnostics a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.mesh-diagnostics a:hover { opacity: 0.8; }

.mesh-diag-advanced-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.mesh-diag-run-btn {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: var(--radius);
  border: 1px solid currentColor;
  background: transparent;
  color: inherit;
  cursor: pointer;
  opacity: 0.8;
}

.mesh-diag-run-btn:hover { opacity: 1; }

.diag-show-btn {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: var(--radius);
  border: 1px solid currentColor;
  background: transparent;
  color: inherit;
  cursor: pointer;
  opacity: 0.7;
  white-space: nowrap;
  flex-shrink: 0;
}

.diag-show-btn:hover { opacity: 1; }

.mesh-diag-run-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.mesh-diag-spinner {
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: diag-spin 0.6s linear infinite;
  opacity: 0.6;
}

.mesh-diag-spinner.hidden { display: none; }

@keyframes diag-spin { to { transform: rotate(360deg); } }

/* ── Surface Exclusions panel ────────────────────────────────────────────── */

/* Tool button row */
.excl-tools {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.excl-mode-row {
  margin-bottom: 10px;
}
.excl-mode-row .excl-seg {
  width: 100%;
}

.excl-tool-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 5px 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.excl-tool-btn:hover {
  border-color: var(--accent-hover);
  color: var(--text);
}

.excl-tool-btn.active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface2));
  border-color: var(--accent);
  color: var(--accent);
}

.excl-shift-hint {
  font-size: 10px;
  color: var(--text-muted);
  margin: -4px 0 8px;
  text-align: center;
}

/* Segmented button group (Single / Radius) */
.excl-seg {
  display: flex;
  flex: 1;
}

.excl-seg-btn {
  flex: 1;
  padding: 4px 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.excl-seg-btn:first-child {
  border-radius: var(--radius) 0 0 var(--radius);
}

.excl-seg-btn:last-child {
  border-radius: 0 var(--radius) var(--radius) 0;
  border-left: none;
}

.excl-seg-btn.active {
  background: color-mix(in srgb, var(--accent) 18%, var(--surface2));
  border-color: var(--accent);
  color: var(--accent);
}

/* Green active state for the Include Only mode button */
#excl-mode-include.active {
  background: color-mix(in srgb, #00cc66 18%, var(--surface2));
  border-color: #00cc66;
  color: #00cc66;
}

.excl-seg-btn:hover:not(.active) {
  background: var(--border);
  color: var(--text);
}

/* Footer row: count + clear */
.excl-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 10px;
}

.excl-footer .excl-shift-hint {
  margin: 0;
}

.excl-count {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.excl-clear-btn {
  padding: 4px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.excl-clear-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, var(--surface2));
}

/* Hide utility (used by JS to show/hide exclusion sub-rows) */
.form-row.hidden { display: none; }

/* Regularize debug knob group — visually nested under the toggle */
.regularize-debug-rows {
  margin: 4px 0 8px 16px;
  padding-left: 8px;
  border-left: 2px solid var(--border);
}
.regularize-debug-rows .form-row {
  margin: 4px 0;
}
.regularize-debug-rows label {
  flex: 1;
  font-size: 11px;
  color: var(--text-muted);
}
.regularize-debug-rows input[type="number"] {
  width: 80px;
}
.regularize-debug-rows.disabled {
  opacity: 0.45;
  pointer-events: none;
}

/* Debug stats for last picked triangle in masking mode */
.masking-tri-debug {
  margin: 8px 0 0 0;
  padding: 6px 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 10px;
  line-height: 1.35;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre;
  overflow-x: auto;
}

/* ── Precision masking ───────────────────────────────────────────────── */
.precision-masking-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}

.precision-masking-row.hidden { display: none; }

.precision-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}

.precision-label input[type="checkbox"] {
  margin: 0;
}

.precision-status {
  font-size: 10px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.precision-outdated {
  font-size: 10px;
  color: #f59e0b;
  white-space: nowrap;
}

.precision-outdated.hidden { display: none; }

.precision-refresh-btn {
  padding: 2px 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  line-height: 1;
}

.precision-refresh-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.precision-refresh-btn.hidden { display: none; }

.precision-warning {
  background: color-mix(in srgb, #f59e0b 15%, var(--surface2));
  border: 1px solid #f59e0b;
  color: #f59e0b;
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 11px;
  line-height: 1.4;
  margin-bottom: 8px;
}

.precision-warning.hidden { display: none; }

/* ── Sponsor / popup overlay ─────────────────────────────────────────── */
.sponsor-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(3px);
}

.sponsor-overlay.hidden { display: none; }

.sponsor-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 420px;
  width: calc(100% - 40px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.sponsor-modal h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  margin: 0;
}

.sponsor-modal p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

.sponsor-link {
  display: block;
  text-align: center;
  padding: 10px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s;
}

.sponsor-link:hover { background: var(--accent-hover); }

.sponsor-link--paypal {
  background: #009cde;
}
.sponsor-link--paypal:hover { background: #007bb5; }

.sponsor-link--kofi {
  background: #ff5e5b;
}
.sponsor-link--kofi:hover { background: #e04e4b; }

.sponsor-no-show {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.sponsor-no-show input { cursor: pointer; accent-color: var(--accent); }

.sponsor-close-btn {
  padding: 8px 16px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  align-self: flex-end;
}

.sponsor-close-btn:hover {
  background: var(--border);
  border-color: var(--accent);
}

/* ── License link (sidebar) ──────────────────────────────────────────────── */
.license-link {
  display: block;
  width: 100%;
  padding: 12px 0;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  text-align: center;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: color 0.15s, text-decoration-color 0.15s;
}

.license-link:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ── License popup overlay ───────────────────────────────────────────────── */
.license-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(3px);
}

.license-overlay.hidden { display: none; }

.license-modal {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 460px;
  width: calc(100% - 40px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.license-modal h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  margin: 0;
}

.license-list {
  margin: 0;
  padding-left: 1.2em;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.license-list li {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.license-list li strong {
  color: var(--text);
}

.license-list li a {
  color: var(--accent);
  text-decoration: none;
}

.license-list li a:hover {
  text-decoration: underline;
}

/* ── Imprint modal extras ────────────────────────────────────────────────── */
.imprint-modal {
  max-width: 520px;
  max-height: 85vh;
  overflow-y: auto;
}

.imprint-section-heading {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 6px 0 0;
}

.imprint-text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

.imprint-text a {
  color: var(--accent);
  text-decoration: none;
}

.imprint-text a:hover {
  text-decoration: underline;
}

/* ── Welcome / What's New popup ──────────────────────────────────────────── */
.welcome-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(3px);
}

.welcome-overlay.hidden { display: none; }

.welcome-modal {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 480px;
  width: calc(100% - 40px);
  max-height: 85vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.welcome-modal h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  margin: 0;
}

.welcome-tagline {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

.welcome-heading {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 8px 0 0;
}

.welcome-date {
  color: var(--text-muted);
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}

.welcome-steps,
.welcome-changelog {
  margin: 0;
  padding-left: 1.2em;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.welcome-steps li,
.welcome-changelog li {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.welcome-changelog li strong {
  color: var(--text);
}

.welcome-changelog li code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  background: var(--surface2);
  padding: 1px 5px;
  border-radius: 3px;
}

.license-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 26px;
  height: 26px;
  padding: 0;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.license-close-btn:hover {
  background: var(--border);
  border-color: var(--accent);
  color: var(--text);
}

/* ── Project save/load (header) ──────────────────────────────────────────── */
.project-io {
  position: relative;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.project-io-gap {
  width: 8px;
  flex: 0 0 8px;
}

.project-io .icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  padding: 0;
}

.project-io .icon-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.project-io .icon-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.export-dialog {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 180px;
  z-index: 100;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.export-dialog.hidden { display: none; }

.export-dialog label.hidden { display: none; }

.export-dialog label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.export-dialog label input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.export-dialog label input:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.export-go-btn {
  margin-top: 4px;
  padding: 6px 12px;
  background: var(--accent);
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s;
}

.export-go-btn:hover { filter: brightness(1.12); }

/* ── Custom-map thumbnail row ────────────────────────────────────────────── */
.custom-map-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}

.custom-map-row.hidden { display: none; }

.custom-map-row .custom-map-swatch {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  aspect-ratio: 1;
}

.custom-map-row .custom-map-swatch .preset-label {
  font-size: 7px;
}

.custom-map-remove {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.custom-map-remove:hover {
  background: var(--border);
  border-color: var(--accent);
  color: var(--text);
}