/* ═══════════════════════════════════════════
   PENPEN - Dark Theme
   ═══════════════════════════════════════════ */
:root {
  --c-bg0:#141414;
  --c-bg1:#1e1e1e;
  --c-bg2:#252525;
  --c-bg3:#2d2d2d;
  --c-bg4:#383838;
  --c-bg5:#444444;
  --c-border: #333333;
  --c-border2:#444444;
  --c-text: #cccccc;
  --c-text-dim: #888888;
  --c-text-bright: #eeeeee;
  --c-accent: #4a9eff;
  --c-accent-dim: #2a6db5;
  --c-accent-bg: rgba(74, 158, 255, 0.15);
  --c-danger: #e05050;
  --c-success: #50c050;
  --c-warn: #e0a050;
  --c-sel: rgba(74, 158, 255, 0.4);
  --toolbar-w: 44px;
  --ruler-sz: 18px;
  --optbar-h: 34px;
  --menubar-h: 28px;
  --statusbar-h: 24px;
  --panel-w: 240px;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 12px;
  background: var(--c-bg0);
  color: var(--c-text);
  -webkit-font-smoothing: antialiased;
  user-select: none;
}

/* ═══ App Layout ═══ */
#app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* ═══ Menu Bar ═══ */
#menu-bar {
  display: flex;
  align-items: center;
  height: var(--menubar-h);
  background: var(--c-bg1);
  border-bottom: 1px solid var(--c-border);
  padding: 0 6px;
  gap: 2px;
  flex-shrink: 0;
  z-index: 100;
}

#app-logo {
  font-weight: 800;
  font-size: 14px;
  color: var(--c-accent);
  padding: 0 10px 0 4px;
  letter-spacing: 1px;
}

.menu-item {
  position: relative;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 3px;
  transition: background 0.1s;
}

.menu-item:hover, .menu-item:focus {
  background: var(--c-bg4);
  outline: none;
}

.menu-item > span {
  pointer-events: none;
}

.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  min-width: 200px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
  z-index: 200;
  padding: 3px 0;
}

.menu-item.menu-open .dropdown {
  display: block;
}

.drop-item {
  padding: 6px 12px 6px 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  white-space: nowrap;
  transition: background 0.1s;
}

.drop-item:hover {
  background: var(--c-accent-bg);
  color: var(--c-text-bright);
}

.drop-item kbd {
  font-family: inherit;
  font-size: 10px;
  color: var(--c-text-dim);
  background: transparent;
  border: none;
  padding: 0;
}

.drop-sep {
  height: 1px;
  background: var(--c-border);
  margin: 3px 0;
}

.ctx-menu {
  position: fixed;
  z-index: 1000;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  min-width: 140px;
  padding: 4px 0;
}

.ctx-menu.hidden {
  display: none;
}

.has-sub {
  position: relative;
}

.sub-dropdown {
  display: none;
  position: absolute;
  left: 100%;
  top: -3px;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  min-width: 180px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
  padding: 3px 0;
  z-index: 300;
}

.has-sub:hover .sub-dropdown {
  display: block;
}

/* ═══ Options Bar ═══ */
#options-bar {
  height: var(--optbar-h);
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  padding: 0 8px;
  gap: 8px;
  flex-shrink: 0;
  overflow: hidden;
}

#tool-options-content {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

#tool-options-content label {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--c-text-dim);
}

#tool-options-content input[type=range] {
  width: 90px;
  accent-color: var(--c-accent);
}

#tool-options-content input[type=number] {
  width: 52px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 2px 4px;
  border-radius: 3px;
  text-align: center;
}

#tool-options-content select {
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 2px 4px;
  border-radius: 3px;
  cursor: pointer;
}

#tool-options-content .opt-sep {
  width: 1px;
  height: 20px;
  background: var(--c-border2);
  margin: 0 4px;
}

/* ═══ Tab Bar ═══ */
#tab-bar {
  display: flex;
  align-items: flex-end;
  background: var(--c-bg1);
  border-bottom: 1px solid var(--c-border);
  padding: 0 4px;
  gap: 2px;
  flex-shrink: 0;
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 0;
}

#tab-bar:empty {
  display: none;
}

#tab-bar::-webkit-scrollbar {
  height: 3px;
}

#tab-bar::-webkit-scrollbar-track {
  background: var(--c-bg1);
}

#tab-bar::-webkit-scrollbar-thumb {
  background: var(--c-bg4);
  border-radius: 2px;
}

.tab-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 8px 0 10px;
  height: 24px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border);
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  font-size: 12px;
  color: var(--c-text-dim);
  white-space: nowrap;
  user-select: none;
  flex-shrink: 0;
  transition: background 0.1s, color 0.1s;
}

.tab-item:hover {
  background: var(--c-bg4);
  color: var(--c-text);
}

.tab-item.active {
  background: var(--c-bg2);
  color: var(--c-text-bright);
  border-color: var(--c-border2);
}

.tab-close {
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  border: none;
  background: transparent;
  color: var(--c-text-dim);
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
  padding: 0;
  flex-shrink: 0;
}

.tab-close:hover {
  background: var(--c-bg5);
  color: var(--c-danger);
}

/* ═══ Work Area ═══ */
#work-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ═══ Left Toolbar ═══ */
#toolbar {
  width: var(--toolbar-w);
  background: var(--c-bg2);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 0;
  gap: 2px;
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
}

#toolbar::-webkit-scrollbar {
  width: 4px;
}

#toolbar::-webkit-scrollbar-thumb {
  background: var(--c-bg4);
  border-radius: 2px;
}

.tb-btn {
  width: 34px;
  height: 34px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--c-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, border-color 0.1s;
  padding: 5px;
  flex-shrink: 0;
}

.tb-btn svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
  pointer-events: none;
}

.tb-btn .tb-icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.75;
}

.tb-btn:hover .tb-icon-img, .tb-btn.active .tb-icon-img {
  opacity: 1;
}

.tb-btn:hover {
  background: var(--c-bg4);
  border-color: var(--c-border2);
}

.tb-btn[data-tool="hand"]:hover .tb-icon-img,
.tb-btn[data-tool="eyedropper"]:hover .tb-icon-img,
.tb-btn[data-tool="crop"]:hover .tb-icon-img {
  opacity: 0.75;
}

.tb-btn.active {
  background: var(--c-accent-dim);
  border-color: var(--c-accent);
  color: white;
}

.tb-sep {
  width: 28px;
  height: 1px;
  background: var(--c-border);
  margin: 2px 0;
  flex-shrink: 0;
}

/* ── Tool Group (collapsed tool variants) ── */
.tb-group {
  position: relative;
  flex-shrink: 0;
}

/* small triangle arrow in bottom-right corner */
.tb-group-arr {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 16px;
  height: 16px;
  cursor: pointer;
  z-index: 1;
  pointer-events: all;
}

/* visual triangle drawn via ::before so the element itself is the full hit area */
.tb-group-arr::before {
  content: '';
  position: absolute;
  bottom: 3px;
  right: 3px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 6px 6px;
  border-color: transparent transparent var(--c-text-dim) transparent;
  pointer-events: none;
  transition: border-color 0.1s;
}

.tb-group-arr:hover::before {
  border-color: transparent transparent var(--c-text-bright) transparent;
}

/* flyout popup */
.tb-group-popup {
  position: fixed;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  padding: 4px;
  z-index: 2000;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
  min-width: 130px;
  max-height: calc(100vh - 16px);
  overflow-y: auto;
}

.tb-group-popup.hidden {
  display: none;
}

.tb-group-opt {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 5px 8px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  color: var(--c-text);
  cursor: pointer;
  font-size: 12px;
  white-space: nowrap;
  text-align: left;
}

.tb-group-opt svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  fill: currentColor;
}

.tb-group-opt:hover {
  background: var(--c-bg4);
  border-color: var(--c-border2);
}

.tb-group-opt.active {
  color: var(--c-accent);
}

/* Color box in toolbar */
#color-box {
  position: relative;
  width: 34px;
  height: 46px;
  flex-shrink: 0;
  margin-top: 4px;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border: 2px solid var(--c-bg5);
  border-radius: 3px;
  cursor: pointer;
  position: absolute;
}

#bg-swatch {
  background: #ffffff;
  bottom: 0;
  right: 0;
  z-index: 1;
}

#fg-swatch {
  background: #000000;
  top: 0;
  left: 0;
  z-index: 2;
  border-color: var(--c-text);
}

#fg-swatch.active {
  border-color: white;
}

#swap-colors, #reset-colors {
  position: absolute;
  background: none;
  border: none;
  color: var(--c-text);
  cursor: pointer;
  font-size: 12px;
  padding: 0;
  line-height: 1;
}

#swap-colors {
  top: -2px;
  right: -2px;
  font-size: 14px;
}

#reset-colors {
  bottom: -2px;
  left: -2px;
  font-size: 10px;
}

/* ═══ Canvas Wrapper ═══ */
#canvas-wrapper {
  flex: 1;
  display: grid;
  grid-template-columns: 0 1fr;
  grid-template-rows: 0 1fr;
  overflow: hidden;
  background: var(--c-bg0);
}

#ruler-corner {
  grid-column: 1;
  grid-row: 1;
  background: var(--c-bg2);
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  display: none;
}

#ruler-h {
  grid-column: 2;
  grid-row: 1;
  height: var(--ruler-sz);
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
  display: none;
  width: 100%;
}

#ruler-v {
  grid-column: 1;
  grid-row: 2;
  width: var(--ruler-sz);
  background: var(--c-bg2);
  border-right: 1px solid var(--c-border);
  display: none;
  height: 100%;
}

#canvas-scroll-area {
  grid-column: 2;
  grid-row: 2;
  overflow: auto;
  background: var(--c-bg0);
  position: relative;
}

/* Hide scroll overflow when welcome screen is visible to avoid canvas bleed-through */
#canvas-scroll-area:has(#welcome-screen:not(.hidden)) {
  overflow: hidden;
}

/* ═══ Welcome Screen ═══ */
#welcome-screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--c-bg0);
  z-index: 10;
}

#welcome-screen.hidden {
  display: none;
}

#welcome-screen.drag-over {
  outline: 3px dashed var(--c-accent);
  outline-offset: -16px;
  background: color-mix(in srgb, var(--c-accent) 8%, var(--c-bg0));
}

#welcome-screen.drag-over .wlc-drop-hint {
  display: block;
}

.wlc-url-row {
  display: flex;
  gap: 6px;
  width: 100%;
  max-width: 340px;
}

.wlc-url-row input {
  flex: 1;
  padding: 7px 10px;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  color: var(--c-text);
  font-size: 12px;
  outline: none;
  min-width: 0;
}

.wlc-url-row input:focus {
  border-color: var(--c-accent);
}

.wlc-url-row button {
  padding: 7px 14px;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  color: var(--c-text);
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}

.wlc-url-row button:hover:not(:disabled) {
  background: var(--c-bg3);
  border-color: var(--c-accent);
  color: var(--c-text-bright);
}

.wlc-url-row button:disabled {
  opacity: 0.5;
  cursor: default;
}

.wlc-url-error {
  font-size: 11px;
  color: #e06c75;
  max-width: 340px;
  text-align: center;
}

/* Open-from-URL dialog */
.ou-url-input {
  width: 100%;
  box-sizing: border-box;
  padding: 7px 10px;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  color: var(--c-text);
  font-size: 12px;
  outline: none;
}

.ou-url-input:focus {
  border-color: var(--c-accent);
}

.ou-error {
  font-size: 11px;
  color: #e06c75;
}

.wlc-drop-hint {
  display: none;
  position: absolute;
  font-size: 20px;
  color: var(--c-accent);
  font-weight: 600;
  pointer-events: none;
}

.wlc-icon {
  width: 96px;
  height: 96px;
  object-fit: contain;
  filter: drop-shadow(0px 0px 2px white);
  pointer-events: none;
}

.wlc-logo {
  font-size: 52px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-text-bright);
}

.wlc-version {
  font-size: 26px;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--c-text-dim);
  margin-left: 0.3em;
  vertical-align: baseline;
}

.wlc-sub {
  color: var(--c-text-dim);
  font-size: 13px;
}

.wlc-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.wlc-actions button {
  padding: 8px 22px;
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  background: var(--c-bg2);
  color: var(--c-text);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.15s, border-color 0.15s;
}

.wlc-actions button:hover {
  background: var(--c-bg3);
  border-color: var(--c-accent);
  color: var(--c-text-bright);
}

/* Centers canvas when smaller than viewport; scrollable when larger */
#canvas-center {
  width: max-content;
  min-width: 100%;
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  padding: 24px;
}

#canvas-scroll-area::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

#canvas-scroll-area::-webkit-scrollbar-track {
  background: var(--c-bg1);
}

#canvas-scroll-area::-webkit-scrollbar-thumb {
  background: var(--c-bg4);
  border-radius: 5px;
}

#canvas-scroll-area::-webkit-scrollbar-corner {
  background: var(--c-bg1);
}

#canvas-container {
  position: relative;
  flex-shrink: 0;  /* drop shadow for canvas */
  filter: drop-shadow(0 4px 16px rgba(0, 0, 0, 0.8));
}

/* Checkerboard background for transparency */
#canvas-container::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(45deg, #555 25%, transparent 25%), linear-gradient(-45deg, #555 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #555 75%), linear-gradient(-45deg, transparent 75%, #555 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: #3a3a3a;
  pointer-events: none;
  z-index: 0;
}

#main-canvas {
  position: relative;
  display: block;
  z-index: 1;
  image-rendering: auto;  /* smooth CSS upscale — keeps shape anti-aliasing consistent with overlay-canvas */
  width: 100%;
  height: 100%;
}

#overlay-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: all;
  cursor: crosshair;
}

/* ═══ Right Panels ═══ */
#right-panels {
  width: var(--panel-w);
  background: var(--c-bg1);
  border-left: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--c-border);
  min-height: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--c-text-dim);
  cursor: pointer;
  flex-shrink: 0;
}

.panel-btns {
  display: flex;
  gap: 2px;
}

.panel-btns button {
  width: 18px;
  height: 18px;
  background: var(--c-bg4);
  border: 1px solid var(--c-border2);
  border-radius: 3px;
  color: var(--c-text);
  cursor: pointer;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s;
}

.panel-btns button:hover {
  background: var(--c-bg5);
}

.panel-body {
  padding: 8px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.panel-body::-webkit-scrollbar {
  width: 4px;
}

.panel-body::-webkit-scrollbar-thumb {
  background: var(--c-bg4);
  border-radius: 2px;
}

/* ═══ Color Picker ═══ */
#colorpicker {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
}

#cp-sv {
  width: 100%;
  height: 150px;
  border-radius: 3px;
  cursor: crosshair;
  display: block;
  border: 1px solid var(--c-border2);
}

#cp-sv-cursor {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 0 0 1px black;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

#cp-hue, #cp-alpha {
  width: 100%;
  height: 14px;
  border-radius: 7px;
  display: block;
  cursor: pointer;
  border: 1px solid var(--c-border2);
}

#cp-hue-cursor, #cp-alpha-cursor {
  position: relative;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 0 0 1px black;
  pointer-events: none;
  transform: translateX(-50%);
  margin-top: -14px;
}

#cp-inputs {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#cp-preview {
  display: flex;
  height: 20px;
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--c-border2);
  margin-bottom: 4px;
}

#cp-prev-new, #cp-prev-old {
  flex: 1;
}

.cp-row {
  display: flex;
  gap: 4px;
}

.cp-row label {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 10px;
  color: var(--c-text-dim);
}

.cp-row input[type=number] {
  width: 40px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 2px 2px;
  border-radius: 2px;
  text-align: center;
  font-size: 11px;
}

.cp-row .hex-label {
  flex: 1;
}

.cp-row .hex-label input {
  width: 72px;
  font-family: monospace;
  text-transform: uppercase;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 2px 4px;
  border-radius: 2px;
  font-size: 11px;
}

.cp-row input:focus {
  outline: 1px solid var(--c-accent);
  border-color: var(--c-accent);
}

/* Swatches */
#swatches {
  margin-top: 6px;
  border-top: 1px solid var(--c-border);
  padding-top: 6px;
}

#swatches-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-bottom: 4px;
}

#swatches-grid .swatch {
  width: 18px;
  height: 18px;
  border-radius: 2px;
  cursor: pointer;
  border: 1px solid var(--c-border2);
  transition: transform 0.1s;
}

#swatches-grid .swatch:hover {
  transform: scale(1.2);
}

#swatch-add {
  width: 18px;
  height: 18px;
  border-radius: 2px;
  cursor: pointer;
  border: 1px dashed var(--c-border2);
  background: transparent;
  color: var(--c-text-dim);
  font-size: 14px;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

#swatch-add:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

#swatch-msg {
  display: none;
  font-size: 10px;
  color: #e09040;
  margin-bottom: 3px;
  line-height: 1.4;
}

/* 色票右鍵選單 */
#swatch-ctx-menu {
  position: fixed;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  min-width: 110px;
  padding: 4px 0;
  z-index: 1000;
}

#swatch-ctx-menu.hidden {
  display: none;
}

.small-btn {
  font-size: 10px;
  padding: 2px 6px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text-dim);
  border-radius: 3px;
  cursor: pointer;
}

.small-btn:hover {
  background: var(--c-bg4);
  color: var(--c-text);
}

/* ═══ Layer Panel ═══ */
#layer-controls {
  margin-bottom: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#layer-blend-mode {
  width: 100%;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 3px 4px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 11px;
}

.opacity-row {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
}

.opacity-row label {
  color: var(--c-text-dim);
  white-space: nowrap;
}

.opacity-row input[type=range] {
  flex: 1;
  accent-color: var(--c-accent);
}

.opacity-row input[type=number] {
  width: 40px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 2px 2px;
  border-radius: 2px;
  text-align: center;
  font-size: 11px;
}

#layer-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.layer-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 4px;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.1s;
}

.layer-item:hover {
  background: var(--c-bg3);
}

.layer-item.active {
  background: var(--c-accent-bg);
  border-color: var(--c-accent-dim);
}

.layer-thumb-wrap {
  position: relative;
  flex-shrink: 0;
  line-height: 0;
}

.layer-thumb {
  border-radius: 2px;
  border: 1px solid var(--c-border2);
  background: repeating-conic-gradient(#888 0% 25%, #666 0% 50%) 0 0 / 6px 6px;
  overflow: hidden;
}

.layer-type-badge {
  position: absolute;
  bottom: 0;
  right: 0;
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
  padding: 1px 2px;
  border-radius: 2px 0 0 0;
  pointer-events: none;
}

.badge-text {
  background: var(--c-accent);
  color: #fff;
}

.badge-image {
  display: none;
}

.layer-thumb canvas {
  display: block;
}

.layer-info {
  flex: 1;
  min-width: 0;
}

.layer-name {
  font-size: 11px;
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.layer-sub {
  font-size: 10px;
  color: var(--c-text-dim);
}

.layer-name-input {
  width: 100%;
  background: var(--c-bg0);
  border: 1px solid var(--c-accent);
  color: var(--c-text);
  padding: 1px 3px;
  border-radius: 2px;
  font-size: 11px;
}

.layer-btns {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}

.layer-btn {
  width: 18px;
  height: 18px;
  background: transparent;
  border: none;
  color: var(--c-text-dim);
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  padding: 0;
  line-height: 1;
}

.layer-btn:hover {
  background: var(--c-bg4);
  color: var(--c-text);
}

.layer-btn.active {
  color: var(--c-text-bright);
}

.layer-btn.hidden-icon {
  opacity: 0.3;
}

/* ═══ History Panel ═══ */
#history-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.hist-item {
  padding: 4px 8px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 11px;
  color: var(--c-text-dim);
  transition: background 0.1s;
}

.hist-item:hover {
  background: var(--c-bg3);
  color: var(--c-text);
}

.hist-item.current {
  background: var(--c-accent-bg);
  color: var(--c-text-bright);
}

.hist-item.future {
  opacity: 0.4;
}

/* ═══ Status Bar ═══ */
#status-bar {
  height: var(--statusbar-h);
  background: var(--c-bg1);
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 16px;
  font-size: 11px;
  color: var(--c-text-dim);
  flex-shrink: 0;
}

#status-bar span {
  white-space: nowrap;
}

/* ═══ Dialogs ═══ */
#modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.dialog {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 6px;
  min-width: 340px;
  max-width: 90vw;
  max-height: 90vh;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.8);
  z-index: 600;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.dialog.hidden {
  display: none;
}

/* Text tool dialog – non-modal, floats above canvas without overlay */
#dlg-text {
  top: 84px;
  left: 60px;
  transform: none;
  min-width: 280px;
  width: 280px;
}

.text-dlg-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
}

.text-dlg-fmt {
  display: flex;
  gap: 4px;
  align-items: center;
}

.text-dlg-fmt select {
  flex: 1;
}

/* Custom font picker */
.td-font-wrap {
  flex: 1;
  position: relative;
}

#td-font-display {
  width: 100%;
  height: 24px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
  padding: 0 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
  box-sizing: border-box;
  text-align: left;
  overflow: hidden;
}

#td-font-display:hover {
  border-color: var(--c-accent);
}

#td-font-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.td-font-arr {
  font-size: 9px;
  color: var(--c-text-dim);
  flex-shrink: 0;
}

.td-font-opts {
  position: fixed;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  max-height: 200px;
  overflow-y: auto;
  z-index: 9999;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.td-font-opts.hidden {
  display: none;
}

.td-font-opt {
  padding: 5px 10px;
  font-size: 15px;
  cursor: pointer;
  color: var(--c-text);
  line-height: 1.3;
  white-space: nowrap;
}

.td-font-opt:hover {
  background: var(--c-accent-bg);
  color: var(--c-text-bright);
}

.td-font-opt.td-font-opt-active {
  color: var(--c-accent);
}

.text-dlg-fmt input[type=number] {
  width: 52px;
}

.td-spacing-label {
  font-size: 11px;
  color: var(--c-text-dim);
  white-space: nowrap;
}

#td-textarea {
  width: 100%;
  min-height: 90px;
  resize: vertical;
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border2);
  border-radius: 3px;
  padding: 6px;
  font-size: 13px;
  line-height: 1.5;
  box-sizing: border-box;
  outline: none;
}

#td-textarea:focus {
  border-color: var(--c-accent);
}

/* ═══ AI 去背 Dialog ═══ */
#dlg-ai-rmbg {
  top: 84px;
  left: 70px;
  transform: none;
  width: 310px;
  min-width: 310px;
}

.ai-dlg-body {
  padding: 12px 14px;
  gap: 8px;
}

.ai-status-text {
  font-size: 11px;
  color: var(--c-text-dim);
  line-height: 1.4;
  min-height: 16px;
}

.ai-section-label {
  font-size: 10px;
  font-weight: 600;
  color: var(--c-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
}

.ai-progress-bar {
  height: 4px;
  background: var(--c-border2);
  border-radius: 2px;
  overflow: hidden;
}

.ai-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--c-accent);
  transition: width 0.25s ease;
  border-radius: 2px;
}

/* Indeterminate shimmer — CSS animation runs on compositor, unaffected by JS blocking */
@keyframes ai-shimmer {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -200% 0;
  }

}

.ai-progress-bar.ai-indeterminate .ai-progress-fill {
  width: 100% !important;
  transition: none;
  background: linear-gradient(90deg, var(--c-accent-dim) 25%, var(--c-accent)     50%, var(--c-accent-dim) 75%);
  background-size: 300% 100%;
  animation: ai-shimmer 1.5s linear infinite;
}

.ai-model-input {
  width: 100%;
  box-sizing: border-box;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 5px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-family: monospace;
}

.ai-model-input:focus {
  outline: 1px solid var(--c-accent);
  border-color: var(--c-accent);
}

.ai-config-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--c-text-dim);
  cursor: pointer;
  user-select: none;
}

.ai-config-toggle input[type=checkbox] {
  cursor: pointer;
  margin: 0;
}

.ai-config-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.ai-config-add-btn {
  background: var(--c-bg4);
  border: 1px solid var(--c-border2);
  color: var(--c-accent);
  border-radius: 3px;
  font-size: 14px;
  line-height: 1;
  padding: 1px 6px;
  cursor: pointer;
}

.ai-config-add-btn:hover {
  background: var(--c-accent-bg);
}

.ai-config-key-header {
  display: flex;
  gap: 4px;
  font-size: 9px;
  color: var(--c-text-dim);
  padding: 0 2px 2px;
  letter-spacing: 0.05em;
}

.ai-config-key-header span:first-child {
  width: 90px;
  flex-shrink: 0;
}

.ai-config-key-header span:last-child {
  flex: 1;
}

.ai-config-row {
  display: flex;
  gap: 4px;
  margin-bottom: 3px;
  align-items: center;
}

.ai-config-key {
  width: 90px;
  flex-shrink: 0;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  padding: 3px 5px;
  font-size: 11px;
  font-family: monospace;
}

.ai-config-val {
  flex: 1;
  min-width: 0;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  padding: 3px 5px;
  font-size: 11px;
  font-family: monospace;
}

.ai-config-key:focus, .ai-config-val:focus {
  outline: 1px solid var(--c-accent);
  border-color: var(--c-accent);
}

.ai-config-del {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--c-text-dim);
  cursor: pointer;
  font-size: 13px;
  padding: 0 2px;
  line-height: 1;
}

.ai-config-del:hover {
  color: var(--c-danger);
}

#ai-config-rows {
  max-height: 200px;
  overflow-y: auto;
}

.ai-run-btn {
  width: 100%;
  margin-top: 4px;
}

.ai-close-btn {
  width: 100%;
}

.ai-edit-hint {
  font-size: 11px;
  color: var(--c-text-dim);
  line-height: 1.5;
  padding: 6px 0 2px;
  border-top: 1px solid var(--c-border2);
  margin-top: 4px;
}

/* Ensure form-row range inputs don't grow too large in fixed-width dialogs */
.ai-dlg-body .form-row input[type=range] {
  flex: 1;
  min-width: 0;
}

.ai-dlg-body .form-row label {
  min-width: 68px;
}

/* ═══ AI 移除物體 Dialog ═══ */
#dlg-ai-inpaint {
  top: 84px;
  left: 390px;
  transform: none;
  width: 310px;
  min-width: 310px;
}

/* ═══ AI 放大 Dialog ═══ */
#dlg-ai-upsample {
  top: 84px;
  left: 710px;
  transform: none;
  width: 300px;
  min-width: 300px;
}

/* ═══ AI 智慧選取 Dialog ═══ */
#dlg-ai-sam {
  top: 84px;
  left: 70px;
  transform: none;
  width: 280px;
  min-width: 280px;
}

/* ═══ AI 擴展畫面 Dialog ═══ */
#dlg-ai-outpaint {
  top: 84px;
  left: 370px;
  transform: none;
  width: 290px;
  min-width: 290px;
}

#inp-config-rows {
  max-height: 200px;
  overflow-y: auto;
}

/* ─── AiInpaint advanced settings collapsible ─── */
.inp-adv {
  border: 1px solid var(--c-border);
  border-radius: 4px;
}

.inp-adv > summary {
  padding: 6px 10px;
  font-size: 11px;
  color: var(--c-text-dim);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.inp-adv > summary::-webkit-details-marker {
  display: none;
}

.inp-adv > summary::before {
  content: '▶';
  font-size: 9px;
  display: inline-block;
  transition: transform 0.15s;
}

.inp-adv[open] > summary::before {
  transform: rotate(90deg);
}

.inp-adv-body {
  padding: 8px 10px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--c-border);
}

.inp-adv-body .form-row label {
  min-width: 72px;
}

.inp-adv-body .form-row input[type=text] {
  flex: 1;
  min-width: 0;
}

.dlg-header {
  padding: 12px 16px;
  background: var(--c-bg3);
  font-size: 13px;
  font-weight: 600;
  border-bottom: 1px solid var(--c-border);
  cursor: move;
  user-select: none;
}

.dlg-body {
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dlg-footer {
  padding: 10px 16px;
  background: var(--c-bg3);
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.form-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}

.form-row label {
  min-width: 70px;
  color: var(--c-text-dim);
}

.form-row input[type=number], .form-row input[type=text], .form-row select {
  flex: 1;
  max-width: 180px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 4px 8px;
  border-radius: 3px;
  font-size: 12px;
}

.form-row input:focus, .form-row select:focus {
  outline: 1px solid var(--c-accent);
  border-color: var(--c-accent);
}

.form-row span {
  color: var(--c-text-dim);
  font-size: 11px;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  font-size: 11px;
  color: var(--c-text-dim);
}

.preset {
  padding: 3px 8px;
  background: var(--c-bg4);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  cursor: pointer;
  font-size: 11px;
  transition: background 0.1s;
}

.preset:hover {
  background: var(--c-bg5);
}

.btn-ok {
  padding: 5px 20px;
  background: var(--c-accent);
  border: none;
  color: white;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  transition: background 0.1s;
}

.btn-ok:hover {
  background: #66b0ff;
}

.btn-cancel {
  padding: 5px 16px;
  background: var(--c-bg4);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.1s;
}

.btn-cancel:hover {
  background: var(--c-bg5);
}

/* Adjustment sliders in dialogs */
.adj-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.adj-row label {
  min-width: 80px;
  font-size: 11px;
  color: var(--c-text-dim);
}

.adj-row input[type=range] {
  flex: 1;
  accent-color: var(--c-accent);
}

.adj-row input[type=number] {
  width: 56px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 2px 4px;
  border-radius: 3px;
  text-align: center;
  font-size: 11px;
}

/* Curves canvas */
#curves-canvas {
  border: 1px solid var(--c-border2);
  border-radius: 3px;
  background: var(--c-bg3);
  cursor: crosshair;
  display: block;
}

/* Levels canvas */
#levels-canvas {
  border: 1px solid var(--c-border2);
  border-radius: 3px;
  background: var(--c-bg3);
  display: block;
}

/* ═══ Export Preview ═══ */
#exp-preview {
  display: block;
  border: 1px solid var(--c-border2);
  border-radius: 3px;
  background: repeating-conic-gradient(#888 0% 25%, #666 0% 50%) 0 0 / 8px 8px;
}

#exp-info {
  font-size: 11px;
  color: var(--c-text-dim);
  text-align: center;
}

/* ═══ Text Toolbar ═══ */
#text-toolbar {
  position: fixed;
  top: calc(var(--menubar-h) + var(--optbar-h) + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 6px;
  padding: 6px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 400;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

#text-toolbar.hidden {
  display: none;
}

#text-toolbar select, #text-toolbar input[type=number] {
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  padding: 3px 6px;
  border-radius: 3px;
  font-size: 12px;
}

#txt-font {
  width: 130px;
}

#txt-size {
  width: 54px;
  text-align: center;
}

.txt-fmt-btn {
  width: 24px;
  height: 24px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.txt-fmt-btn.active {
  background: var(--c-accent-dim);
  border-color: var(--c-accent);
  color: white;
}

#txt-color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 3px;
  border: 2px solid var(--c-border2);
  cursor: pointer;
}

/* ═══ Context Menu ═══ */
#ctx-menu {
  position: fixed;
  background: var(--c-bg2);
  border: 1px solid var(--c-border2);
  border-radius: 4px;
  min-width: 150px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  z-index: 700;
  padding: 3px 0;
}

#ctx-menu.hidden {
  display: none;
}

.ctx-item {
  padding: 6px 14px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.1s;
}

.ctx-item:hover {
  background: var(--c-accent-bg);
  color: var(--c-text-bright);
}

.ctx-sep {
  height: 1px;
  background: var(--c-border);
  margin: 3px 0;
}

/* ═══ Anchor Grid ═══ */
#anchor-grid {
  display: grid;
  grid-template-columns: repeat(3, 28px);
  gap: 2px;
}

.anchor-btn {
  width: 28px;
  height: 28px;
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.1s;
}

.anchor-btn.active {
  background: var(--c-accent-dim);
  border-color: var(--c-accent);
  color: white;
}

/* ═══ Gradient Dialog ═══ */
#gradient-bar-container {
  position: relative;
  margin: 4px 0;
}

#gradient-bar {
  width: 100%;
  height: 32px;
  border-radius: 4px;
  border: 1px solid var(--c-border2);
  cursor: crosshair;
  display: block;
}

#gradient-stops {
  position: relative;
  height: 12px;
}

.grad-stop-handle {
  position: absolute;
  width: 12px;
  height: 12px;
  background: white;
  border: 2px solid black;
  border-radius: 2px;
  cursor: pointer;
  transform: translateX(-50%);
  top: 0;
}

.grad-stop-handle.active {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 1px var(--c-accent);
}

/* ═══ Hint text ═══ */
.hint-text {
  font-size: 11px;
  color: var(--c-text-dim);
  text-align: center;
  padding: 12px;
}

/* ═══ Input (global) ═══ */
input[type=range] {
  -webkit-appearance: none;
  height: 4px;
  background: var(--c-bg4);
  border-radius: 2px;
  outline: none;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-accent);
  cursor: pointer;
  border: none;
}

input[type=range]::-webkit-slider-thumb:hover {
  background: #66b0ff;
}

select {
  background: var(--c-bg3);
  border: 1px solid var(--c-border2);
  color: var(--c-text);
  border-radius: 3px;
  cursor: pointer;
}

select:focus {
  outline: 1px solid var(--c-accent);
}

/* ═══ About Dialog ═══ */
.about-body {
  align-items: center;
  text-align: center;
  gap: 12px;
}

.about-icon {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  object-fit: contain;
  filter: drop-shadow(0px 0px 2px white);
}

.about-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--c-accent);
  letter-spacing: 2px;
}

.about-version {
  font-size: 11px;
  color: var(--c-text-dim);
}

.about-desc {
  font-size: 12px;
  color: var(--c-text);
  line-height: 1.8;
  max-width: 280px;
}

.about-changelog {
  width: 100%;
  max-width: 300px;
  border-top: 1px solid var(--c-border);
  padding-top: 10px;
  text-align: left;
}

.about-cl-header {
  font-size: 11px;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: 6px;
  letter-spacing: 0.03em;
}

.about-cl-list {
  margin: 0;
  padding-left: 18px;
  list-style: disc;
}

.about-cl-list li {
  font-size: 11px;
  color: var(--c-text);
  line-height: 1.8;
}

/* ═══ Changelog Dialog ═══ */
#dlg-changelog {
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  width: 480px;
}

.cl-dlg-body {
  max-height: 480px;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cl-ver-section {
  border-left: 2px solid var(--c-accent);
  padding-left: 12px;
}

.cl-ver-header {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-text-bright);
  margin-bottom: 4px;
}

.cl-ver-date {
  font-size: 11px;
  font-weight: 400;
  color: var(--c-text-dim);
  margin-left: 6px;
}

.cl-ver-list {
  margin: 0;
  padding-left: 18px;
}

.cl-ver-list li {
  font-size: 11px;
  color: var(--c-text);
  line-height: 1.8;
}

/* ═══ Utilities ═══ */
.hidden {
  display: none !important;
}

/* Marching ants animation */
@keyframes march {
  to {
    stroke-dashoffset: -10;
  }

}

/* Loading indicator */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  font-size: 16px;
  color: white;
}

/* Scrollbar global */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--c-bg1);
}

::-webkit-scrollbar-thumb {
  background: var(--c-bg4);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-bg5);
}

/* Responsive */
@media (max-width:900px) {
  :root {
    --panel-w: 200px;
  }

  #right-panels {
    display: none;
  }

}

@media (max-width:600px) {
  #toolbar {
    width: 38px;
  }

  .tb-btn {
    width: 30px;
    height: 30px;
  }

}

/* ═══ Panel Resize ═══ */
#right-panels {
  resize: horizontal;
  min-width: 180px;
  max-width: 400px;
}

/* ═══ Overlay cursor customization ═══ */
#overlay-canvas.cursor-move {
  cursor: move;
}

#overlay-canvas.cursor-crosshair {
  cursor: crosshair;
}

#overlay-canvas.cursor-text {
  cursor: text;
}

#overlay-canvas.cursor-eyedrop {
  cursor: crosshair;
}

#overlay-canvas.cursor-hand {
  cursor: grab;
}

#overlay-canvas.cursor-hand-grabbing {
  cursor: grabbing;
}

#overlay-canvas.cursor-zoom {
  cursor: zoom-in;
}

#overlay-canvas.cursor-zoom-out {
  cursor: zoom-out;
}

#overlay-canvas.cursor-none {
  cursor: none;
}

/* ═══ Canvas grid overlay ═══ */
#canvas-container.show-grid::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 5;
}

/* Selection mask display */
#selection-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}

/* ═══ Drag to reorder layers ═══ */
.layer-item.drag-over {
  border-top: 2px solid var(--c-accent);
}

.layer-item.dragging {
  opacity: 0.5;
}

/* Panel collapse */
.panel.collapsed .panel-body {
  display: none;
}

.panel.panel-closed {
  display: none;
}

/* Panel header layout */
.panel-header-title {
  flex: 1;
  min-width: 0;
}

.panel-header-title::after {
  content: ' ▼';
  font-size: 8px;
  color: var(--c-text-dim);
}

.panel.collapsed .panel-header-title::after {
  content: ' ▶';
}

.panel-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

/* Panel close button */
.panel-close-btn {
  width: 16px;
  height: 16px;
  background: transparent;
  border: none;
  color: var(--c-text-dim);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  padding: 0;
  line-height: 1;
  transition: color 0.1s, background 0.1s;
}

.panel-close-btn:hover {
  color: var(--c-danger);
  background: rgba(224, 80, 80, 0.12);
}

/* ═══ Minimap Panel ═══ */
#panel-minimap {
  max-height: clamp(80px, 20vh, 200px);
  flex-shrink: 0;
}

#minimap-body {
  padding: 6px;
  overflow: hidden; /* 不顯示卷軸，高度由 JS 動態計算 */
}

#minimap-canvas {
  display: block;
  cursor: crosshair;
  border: 1px solid var(--c-bg4);
  border-radius: 2px;
  margin: 0 auto; /* 水平置中 */

  /* width/height set by JS */
}

/* Panel menu checkmark */
.panel-menu-check {
  width: 14px;
  display: inline-block;
  color: var(--c-accent);
  font-size: 10px;
}

.panel-toggle-item.panel-is-closed .panel-menu-check {
  visibility: hidden;
}

.panel-toggle-item {
  justify-content: flex-start;
  gap: 0;
}

/* View toggle items (rulers / grid) — checkmark hidden by default, shown when .view-on */
.view-toggle-item {
  justify-content: flex-start;
  gap: 0;
}

.view-toggle-item .panel-menu-check {
  visibility: hidden;
}

.view-toggle-item.view-on .panel-menu-check {
  visibility: visible;
}

.view-toggle-item kbd {
  margin-left: auto;
}

/* ── Font Manager ── */
.fm-row {
  display: flex;
  align-items: center;
  padding: 4px 8px;
  border-bottom: 1px solid var(--c-border2);
  gap: 8px;
}

.fm-row:last-child {
  border-bottom: none;
}

.fm-row > span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}

.fm-del-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-text-dim);
  font-size: 16px;
  padding: 0 4px;
  line-height: 1;
}

.fm-del-btn:hover {
  color: #e55;
}

/* ── SEO content block (visible footer for crawlers) ── */
#seo-content {
  display: block;
  background: var(--c-bg1, #111);
  border-top: 1px solid var(--c-border1, #2a2a2a);
  padding: 32px 40px;
  color: var(--c-text-dim, #666);
  font-size: 11px;
  line-height: 1.7;
}
.seo-inner {
  max-width: 900px;
  margin: 0 auto;
}
#seo-content h2 {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text-dim, #666);
  margin: 0 0 8px;
}
#seo-content h3 {
  font-size: 11px;
  font-weight: 600;
  color: var(--c-text-dim, #666);
  margin: 16px 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
#seo-content p, #seo-content dd {
  margin: 0 0 4px;
  color: var(--c-text-dim, #555);
}
#seo-content ul {
  margin: 4px 0;
  padding-left: 18px;
}
#seo-content li {
  margin-bottom: 2px;
}
#seo-content dl {
  margin: 4px 0;
}
#seo-content dt {
  font-weight: 600;
  margin-top: 8px;
  color: var(--c-text-dim, #666);
}
#seo-content strong {
  color: var(--c-text-dim, #666);
}