/* components.css (ui components) */
/* Split from legacy style.css */

/* Generic utility */
.hidden {
  display: none !important;
}

.tabContainer {
  display: grid;
  width: 100%;
  height: 100%;
  min-width: 0;
}

.tabContainer.rows {
  grid-template-rows: auto 1fr;
}

.tabContainer .tabs {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr auto;
  background: linear-gradient(to bottom, rgba(5, 5, 15, 0.95), rgba(3, 3, 10, 0.9));
  border-bottom: 1px solid rgba(0, 255, 255, 0.2);
  /* Feels more "app-like" when the tab bar stays visible while scrolling */
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 -1px 0 rgba(0, 255, 255, 0.1);
}

.tabContainer .tab {
  padding: 0.85rem 1.2rem;
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border-bottom: 3px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
  background: linear-gradient(to bottom, rgba(0, 255, 255, 0), rgba(0, 255, 255, 0));
  overflow: hidden;
}

.tabContainer .tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 255, 255, 0.03) 0%, rgba(0, 255, 255, 0.08) 100%);
  opacity: 0;
  transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.sidebar-close {
  display: none;
  align-self: stretch;
  padding: 0.75rem 1rem;
  border: none;
  border-left: 1px solid var(--dark-border);
  background: rgba(0, 255, 255, 0.05);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
}

.sidebar-close:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.12);
}

@media screen and (max-width: 800px) {
  .sidebar-close {
    display: block;
  }
}

.tabContainer .tab:hover {
  color: var(--neon-cyan-light);
  background: linear-gradient(to bottom, rgba(0, 255, 255, 0.08), rgba(0, 255, 255, 0.03));
}

.tabContainer .tab:hover::before {
  opacity: 1;
}

/* Sub-tabs within Patterns panel */
.subtabContainer {
  display: grid;
  width: 100%;
  height: 100%;
}

.subtabContainer.rows {
  grid-template-rows: auto 1fr;
}

.subtabContainer .subtabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  background: rgba(3, 3, 8, 0.8);
  border-bottom: 1px solid var(--dark-border);
}

.subtabContainer .subtab {
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.subtabContainer .subtab:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.subtabContainer input[type='radio'][name='patternGroup'] {
  display: none;
}

.subtabContainer .subpanels {
  background: rgba(3, 3, 8, 0.4);
  overflow-y: auto;
}

.subtabContainer .subpanel {
  display: none;
  animation: fadein 0.3s ease;
  padding: 1rem;
  gap: 0.75rem;
}

.subtabContainer input[type='radio'][name='patternGroup']:checked + .subpanel {
  display: grid;
}

/* Image controls (Filters vs Thresholds) */
.imageControls {
  display: grid;
  width: 100%;
  border: 1px solid var(--dark-border);
  border-radius: 6px;
  overflow: hidden;
  background: rgba(3, 3, 8, 0.35);
}

.imageControls.rows {
  grid-template-rows: auto 1fr;
}

.imageControls-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--dark-border);
  background: rgba(3, 3, 8, 0.55);
}

.imageControls-tab {
  padding: 0.5rem 0.75rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.imageControls-tab:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.imageControls-panels {
  overflow: hidden;
}

.imageControls input[type='radio'][name='imageControlsGroup'] {
  display: none;
}

.imageControls-panel {
  display: none;
  padding: 0.75rem;
  gap: 0.6rem;
  animation: fadein 0.2s ease;
}

.imageControls input[type='radio'][name='imageControlsGroup']:checked + .imageControls-panel {
  display: grid;
}

/* Filters tab: 2-column slider layout, centered within each column cell */
.imageFiltersGrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 0.75rem;
  width: 100%;
  min-width: 0;
}

.imageFilterItem {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  text-align: left;
  gap: 0.35rem;
  width: 100%;
  min-width: 0;
}

.imageFilterItem label {
  margin: 0;
}

.imageFilterItem input[type="range"] {
  width: 100%;
  max-width: none;
}

.imageFilterItem input[type="number"] {
  width: 90px;
  padding: 0.25rem 0.5rem;
  background: rgba(0, 255, 255, 0.05);
  border: 1px solid var(--dark-border);
  color: var(--text-primary);
  font-size: 0.9rem;
  border-radius: 4px;
  text-align: center;
}

.imageFilterCheckbox input[type="checkbox"] {
  transform: scale(1.1);
}

.imageFilterItemSpan2 {
  grid-column: 1 / -1;
}

.imageFilterItemSpan2 input[type="range"] {
  max-width: 320px;
}

.imageRgbGrid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  width: 100%;
  min-width: 0;
}

.imageRgbItem input[type="range"] {
  max-width: none;
}

/* Pattern Source Tabs (nested inside Thresholds panel) */
.pattern-source-tabs-container {
  display: grid;
  width: 100%;
  gap: 0;
}

.pattern-source-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--dark-border);
  background: rgba(3, 3, 8, 0.55);
}

.pattern-source-tab {
  padding: 0.5rem 0.75rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.pattern-source-tab:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.pattern-source-panels {
  overflow: hidden;
}

.pattern-source-panels input[type='radio'][name='patternSourceGroup'] {
  display: none;
}

.pattern-source-panel {
  display: none;
  padding: 0.75rem;
  gap: 0.6rem;
  animation: fadein 0.2s ease;
}

.pattern-source-panels input[type='radio'][name='patternSourceGroup']:checked + .pattern-source-panel {
  display: grid;
}

/* Highlight active pattern-source tab */
.pattern-source-tabs-container:has(#patternSourceEdges:checked) .pattern-source-tab[for='patternSourceEdges'],
.pattern-source-tabs-container:has(#patternSourceDots:checked) .pattern-source-tab[for='patternSourceDots'],
.pattern-source-tabs-container:has(#patternSourceLines:checked) .pattern-source-tab[for='patternSourceLines'] {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.08);
}

/* Highlight active image-controls tab */
.imageControls:has(#imageControlsFilters:checked) .imageControls-tab[for='imageControlsFilters'],
.imageControls:has(#imageControlsPlacement:checked) .imageControls-tab[for='imageControlsPlacement'],
.imageControls:has(#imageControlsThresholds:checked) .imageControls-tab[for='imageControlsThresholds'] {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.08);
}

.subtabContainer #pattern-image:checked ~ .subtabs .subtab[for='pattern-image'],
.subtabContainer #pattern-text:checked ~ .subtabs .subtab[for='pattern-text'] {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.1);
  text-shadow: var(--glow-cyan-soft);
}

/* Maze Settings Sub-tabs (Background/Wall) */
.mazeSettingsContainer {
  display: grid;
  width: 100%;
  height: 100%;
}

.mazeSettingsContainer.rows {
  grid-template-rows: auto 1fr;
}

.mazeSettingsTabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: rgba(3, 3, 8, 0.8);
  border-bottom: 1px solid var(--dark-border);
}

.mazeSettingsTab {
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mazeSettingsTab:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.mazeSettingsPanels {
  background: rgba(3, 3, 8, 0.4);
  overflow-y: auto;
}

.mazeSettingsContainer input[type='radio'][name='mazeSettingsGroup'] {
  display: none;
}

.mazeSettingsPanel {
  display: none;
  animation: fadein 0.3s ease;
  padding: 1rem;
  gap: 0.75rem;
}

.mazeSettingsContainer input[type='radio'][name='mazeSettingsGroup']:checked + .mazeSettingsPanel {
  display: grid;
}

.mazeSettingsContainer #mazeSettingsBackground:checked ~ .mazeSettingsTabs .mazeSettingsTab[for='mazeSettingsBackground'],
.mazeSettingsContainer #mazeSettingsWall:checked ~ .mazeSettingsTabs .mazeSettingsTab[for='mazeSettingsWall'] {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.1);
  text-shadow: var(--glow-cyan-soft);
}

/* Background Mode Sub-tabs (Solid/Mirrored/Custom) */
.bgModeContainer {
  display: grid;
  width: 100%;
  border: 1px solid var(--dark-border);
  border-radius: 6px;
  overflow: hidden;
  background: rgba(3, 3, 8, 0.35);
}

.bgModeContainer.rows {
  grid-template-rows: auto 1fr;
}

.bgModeTabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--dark-border);
  background: rgba(3, 3, 8, 0.55);
}

.bgModeTab {
  padding: 0.5rem 0.75rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.bgModeTab:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.bgModePanels {
  overflow: hidden;
}

.bgModeContainer input[type='radio'][name='bgModeGroup'] {
  display: none;
}

.bgModePanel {
  display: none;
  padding: 0.75rem;
  gap: 0.6rem;
  animation: fadein 0.2s ease;
}

.bgModeContainer input[type='radio'][name='bgModeGroup']:checked + .bgModePanel {
  display: grid;
}

.bgModeContainer:has(#bgModeSolid:checked) .bgModeTab[for='bgModeSolid'],
.bgModeContainer:has(#bgModeMirror:checked) .bgModeTab[for='bgModeMirror'],
.bgModeContainer:has(#bgModeCustom:checked) .bgModeTab[for='bgModeCustom'] {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.08);
}

.tabContainer input[type='radio'] {
  display: none;
}

.tabContainer .panels {
  background: rgba(5, 5, 10, 0.6);
  overflow-y: auto;
  overflow-x: hidden;
  min-width: 0;
  scrollbar-gutter: stable;
}

.tabContainer .panel {
  display: none;
  animation: fadein 0.4s ease;
}

@keyframes fadein {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
}
}

.tabContainer *:checked + .panel {
  display: grid;
  gap: 12px;
  padding: 12px;
  min-width: 0;
}

.tabContainer *:checked ~ .tabs .tab:has([for]:checked),
.tabContainer .tab:has(+ input:checked) {
  color: var(--neon-cyan-light);
  border-bottom-color: var(--neon-cyan);
  background: linear-gradient(to bottom, rgba(0, 255, 255, 0.15), rgba(0, 255, 255, 0.05));
  text-shadow: 0 0 8px rgba(0, 255, 255, 0.4), 0 0 16px rgba(0, 255, 255, 0.2);
  font-weight: 600;
  box-shadow: inset 0 -2px 8px rgba(0, 255, 255, 0.2);
}

.tabContainer *:checked ~ .tabs .tab:has([for]:checked)::before,
.tabContainer .tab:has(+ input:checked)::before {
  opacity: 1;
  background: linear-gradient(135deg, rgba(0, 255, 255, 0.12) 0%, rgba(0, 255, 255, 0.2) 100%);
}

/* Form Elements */
.panel label {
  color: var(--text-secondary);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
}

/* Color inputs - now used for 2-column layout (background color/opacity) */
.color-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.color-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.color-input-group label {
  margin-bottom: 0;
}

.checkbox-input-group {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
}

.checkbox-input-group label {
  margin-bottom: 0;
}

.checkbox-input-group input[type="checkbox"] {
  margin-top: auto;
  align-self: flex-start;
  /* Align checkbox bottom with color input bottom (40px height + 0.5rem gap) */
  margin-top: calc(40px - 20px + 0.5rem);
}

/* Slider inputs in 2-column layout */
.slider-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.slider-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.slider-input-group label {
  margin-bottom: 0;
}

.panel input[type="color"] {
  width: 100%;
  height: 40px;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  background: var(--dark-panel);
  cursor: pointer;
  transition: all 0.3s ease;
}

.panel input[type="color"]:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
}

.panel input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--dark-panel);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  border: 1px solid var(--dark-border);
}

.panel input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--neon-cyan);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px var(--neon-cyan);
  transition: all 0.3s ease;
}

.panel input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 15px var(--neon-cyan);
  transform: scale(1.1);
}

.panel input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--neon-cyan);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 0 10px var(--neon-cyan);
  transition: all 0.3s ease;
}

.panel input[type="range"]::-moz-range-thumb:hover {
  box-shadow: 0 0 15px var(--neon-cyan);
  transform: scale(1.1);
}

.panel input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--neon-cyan);
  cursor: pointer;
}

.panel input[type="text"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  background: var(--dark-panel);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.panel textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  background: var(--dark-panel);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.3s ease;
  min-height: 2.6rem;
  resize: vertical;
}

.panel input[type="text"]:focus {
  outline: none;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.panel textarea:focus {
  outline: none;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.panel input[type="text"]::placeholder {
  color: var(--text-muted);
}

.panel textarea::placeholder {
  color: var(--text-muted);
}

.panel input[type="file"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  background: var(--dark-panel);
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.panel input[type="file"]:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  background: rgba(0, 255, 255, 0.05);
}

.panel input[type="file"]::file-selector-button {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--neon-cyan);
  border-radius: 4px;
  background: rgba(0, 255, 255, 0.1);
  color: var(--neon-cyan);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-right: 0.5rem;
}

.panel input[type="file"]::file-selector-button:hover {
  background: rgba(0, 255, 255, 0.2);
  box-shadow: 0 0 10px var(--neon-cyan);
}

.pattern-preview {
  width: 100%;
  min-height: 60px;
  margin: 0.5rem 0;
  padding: 0.5rem;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  background: var(--dark-panel);
  display: grid;
  gap: 0.5rem;
  justify-items: center;
  align-content: center;
  max-width: 100%;
  overflow-x: hidden; /* prevent preview grids from forcing sidebar overflow */
}

.preview-top-row {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  min-width: 0;
  max-width: 100%;
}

.preview-top-row.drag-scroll-x {
  cursor: grab;
  /* Allow vertical page scroll while we implement horizontal drag */
  touch-action: pan-y;
  user-select: none;
}

.preview-top-row.drag-scroll-x.drag-scrolling {
  cursor: grabbing;
}

.preview-top-row.filters-duo {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 0.75rem;
  align-items: start;
  justify-items: center;
}

@media screen and (max-width: 520px) {
  .preview-top-row.filters-duo {
    grid-template-columns: 1fr;
  }
}

@media screen and (min-width: 1200px) {
  .preview-top-row.filters-quad {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(220px, 1fr);
    gap: 0.75rem;
    align-items: start;
    justify-items: center;
    overflow-x: auto;
    padding-bottom: 6px;
    min-width: 0;
    max-width: 100%;
  }
  .preview-top-row.filters-quad .preview-thumbnail {
    max-width: 260px;
  }
}

/* Desktop: previews are ALWAYS a single horizontal strip (never multiple rows). */
@media screen and (min-width: 901px) {
  .preview-top-row,
  .preview-top-row.filters-duo,
  .preview-top-row.filters-quad {
    display: grid !important;
    grid-auto-flow: column;
    grid-auto-columns: 120px;
    align-items: start;
    justify-content: start;
    gap: 0.75rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 6px;
  }

  .preview-top-row > div {
    width: 120px;
  }

  .preview-thumbnail {
    width: 100%;
    height: 120px;
  }

  /* Mask previews: also one row */
  .mask-previews {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    gap: 0.75rem;
    padding-bottom: 6px;
    scroll-snap-type: x mandatory;
  }

  .mask-preview-container {
    flex: 0 0 auto;
    width: 220px;
    scroll-snap-align: start;
  }
}

/* Narrower layouts: avoid cramped 2-col grids inside the sidebar */
@media screen and (max-width: 1100px) {
  .imageFiltersGrid {
    grid-template-columns: 1fr;
  }
  .bgRemovalGrid {
    grid-template-columns: 1fr;
  }
}

.image-button-row {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  align-items: center;
}

.image-button-row .clear-btn {
  margin-top: 0;
}

.bgRemovalPrimaryRow {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  align-items: center;
}

.bgRemovalSecondaryRow {
  width: 100%;
  margin-top: 0.5rem;
}

.bgRemovalSecondaryRow .clear-btn {
  width: 100%;
  margin-top: 0;
}

.bgRemovalPrimaryRow .bgRemovalCheckbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  background: rgba(3, 3, 8, 0.3);
}

.bgRemovalPrimaryRow .bgRemovalCheckbox label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  margin: 0;
  flex: 1;
}

.bgRemovalPrimaryRow .bgRemovalCheckbox input[type="checkbox"] {
  transform: scale(1.2);
  cursor: pointer;
}

.mask-editor-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 20000;
  display: grid;
  place-items: center;
  padding: 1rem;
  backdrop-filter: blur(4px);
}

.mask-editor-overlay.hidden {
  display: none;
}

.mask-editor-modal {
  width: min(1100px, 96vw);
  height: min(720px, 90dvh);
  background: rgba(10, 10, 15, 0.96);
  border: 1px solid var(--dark-border);
  border-radius: 10px;
  box-shadow: var(--glow-cyan-soft);
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
}

/* Help modal */
.help-nav-btn {
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
}

.help-nav-btn:hover {
  border-color: var(--dark-border-hover);
  box-shadow: var(--glow-cyan-soft);
}

.help-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  z-index: 18000;
  display: grid;
  place-items: center;
  padding: 1rem;
  backdrop-filter: blur(6px);
}

.help-modal-overlay.hidden {
  display: none;
}

.help-modal {
  width: min(1100px, 96vw);
  height: min(760px, 92dvh);
  background: rgba(10, 10, 15, 0.96);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  box-shadow: var(--glow-cyan-soft);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
}

.help-modal-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1rem;
  background: rgba(3, 3, 8, 0.7);
  border-bottom: 1px solid var(--dark-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.help-modal-title {
  color: var(--neon-cyan);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 800;
  font-size: 0.95rem;
}

.help-modal-close {
  width: auto;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--dark-border);
  background: rgba(0, 255, 255, 0.05);
  color: var(--text-secondary);
  border-radius: 8px;
}

.help-modal-close:hover {
  border-color: var(--dark-border-hover);
  color: var(--neon-cyan);
  box-shadow: var(--glow-cyan-soft);
}

.help-modal-body {
  min-height: 0;
  overflow: auto;
  scrollbar-gutter: stable;
}

.help-modal-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem;
  min-height: 0;
}

.help-toc {
  border: 1px solid var(--dark-border);
  border-radius: 10px;
  background: rgba(3, 3, 8, 0.35);
  padding: 0.75rem 0.75rem;
  position: sticky;
  top: 0.75rem;
  align-self: start;
}

.help-toc-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.help-toc-link {
  display: block;
  padding: 0.45rem 0.5rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px solid transparent;
}

.help-toc-link:hover {
  color: var(--neon-cyan);
  background: rgba(0, 255, 255, 0.06);
  border-color: rgba(0, 255, 255, 0.18);
}

.help-content {
  min-width: 0;
  display: grid;
  gap: 1rem;
}

.help-section {
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  background: rgba(3, 3, 8, 0.28);
  padding: 0.9rem 1rem;
}

.help-section h2 {
  margin: 0 0 0.5rem 0;
  color: var(--neon-cyan);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.help-section h3 {
  margin: 0.75rem 0 0.25rem 0;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.help-section ul,
.help-section ol {
  margin: 0.5rem 0 0 1.1rem;
  color: var(--text-secondary);
}

.help-section li {
  margin: 0.25rem 0;
}

.help-callout {
  border: 1px solid rgba(0, 255, 255, 0.22);
  background: rgba(0, 255, 255, 0.06);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  color: var(--text-primary);
}

.help-steps {
  margin-top: 0.75rem;
}

.help-diagram {
  margin: 0.9rem 0 0 0;
  padding: 0.75rem;
  border: 1px solid rgba(0, 255, 255, 0.18);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.25);
}

.help-diagram figcaption {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.help-diagram svg {
  width: 100%;
  height: auto;
  display: block;
  color: var(--text-primary);
}

.help-diagram svg rect,
.help-diagram svg line {
  stroke: rgba(0, 255, 255, 0.25);
  stroke-width: 2;
  fill: rgba(0, 255, 255, 0.05);
}

.help-diagram svg text {
  fill: currentColor;
  font-family: inherit;
  font-size: 24px;
  letter-spacing: 0.02em;
}

kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.85em;
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
  border: 1px solid rgba(0, 255, 255, 0.25);
  background: rgba(0, 255, 255, 0.06);
  color: var(--neon-cyan);
}

.help-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.75rem;
}

@media screen and (max-width: 900px) {
  .help-modal {
    height: min(820px, 94dvh);
  }
  .help-modal-layout {
    grid-template-columns: 1fr;
  }
  .help-toc {
    position: relative;
    top: auto;
  }
}

.mask-editor-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--dark-border);
  background: rgba(3, 3, 8, 0.65);
}

.mask-editor-title {
  color: var(--neon-cyan);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.95rem;
}

.mask-editor-close {
  width: auto;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--dark-border);
  background: rgba(0, 255, 255, 0.05);
  color: var(--text-secondary);
  border-radius: 6px;
}

.mask-editor-body {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0.75rem;
  padding: 0.75rem;
  min-height: 0;
}

.mask-editor-canvas-wrap {
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.45);
  overflow: hidden;
  min-height: 0;
  position: relative;
}

#maskEditorCanvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
  touch-action: none;
}

.mask-editor-controls {
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  background: rgba(3, 3, 8, 0.35);
  padding: 0.6rem;
  display: grid;
  grid-template-rows: auto auto auto auto;
  gap: 0.55rem;
  min-height: 0;
}

.mask-editor-tool-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.mask-editor-toolbar-handle {
  display: none;
}

@media screen and (max-width: 901px) {
  .mask-editor-overlay {
    padding: 0;
    place-items: stretch;
  }

  .mask-editor-modal {
    width: 100vw;
    height: 100dvh;
    border-radius: 0;
  }

  .mask-editor-body {
    grid-template-columns: 1fr;
    padding: 0;
    gap: 0;
  }

  .mask-editor-canvas-wrap {
    border-radius: 0;
    border: none;
  }

  .mask-editor-controls {
    position: fixed;
    left: 50%;
    bottom: 12px;
    transform: translateX(-50%);
    width: min(340px, calc(100vw - 16px));
    max-height: min(44dvh, 420px);
    overflow: auto;
    z-index: 20010;
    box-shadow: 0 10px 30px rgba(0,0,0,0.55);
    backdrop-filter: blur(10px);
  }

  .mask-editor-controls.floating-moved {
    transform: none;
    bottom: auto;
  }

  .mask-editor-toolbar-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 28px;
    margin: -0.25rem 0 0.5rem 0;
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    background: rgba(0, 255, 255, 0.06);
    color: var(--neon-cyan);
    cursor: grab;
    user-select: none;
    touch-action: none;
  }

  .mask-editor-toolbar-handle:active {
    cursor: grabbing;
  }
}