/* ============================================================
   iSticker — Component Styles
   Buttons, inputs, badges, toasts, upload zone, image list,
   shape/background selectors, and all reusable UI pieces.
   ============================================================ */

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--is-sp-2);
  height: var(--is-btn-h);
  padding: 0 var(--is-sp-3);
  font-size: var(--is-fs-md);
  font-weight: var(--is-fw-medium);
  line-height: 1;
  border-radius: var(--is-r-md);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition:
    background var(--is-dur-fast) var(--is-ease-out),
    border-color var(--is-dur-fast) var(--is-ease-out),
    color var(--is-dur-fast) var(--is-ease-out),
    box-shadow var(--is-dur-fast) var(--is-ease-out),
    opacity var(--is-dur-fast) var(--is-ease-out);
}

.btn svg {
  flex-shrink: 0;
}

/* --- Primary --- */
.btn--primary {
  background: var(--is-accent);
  color: var(--is-accent-fg);
  border-color: var(--is-accent);
  box-shadow: var(--is-shadow-xs);
}

.btn--primary:hover:not(:disabled) {
  background: var(--is-accent-hover);
  border-color: var(--is-accent-hover);
  box-shadow: var(--is-shadow-sm);
}

.btn--primary:active:not(:disabled) {
  background: var(--is-accent-active);
  border-color: var(--is-accent-active);
  box-shadow: none;
  transform: scale(0.98);
}

/* --- Ghost --- */
.btn--ghost {
  background: transparent;
  color: var(--is-fg-secondary);
}

.btn--ghost:hover:not(:disabled) {
  background: var(--is-hover);
  color: var(--is-fg-primary);
}

.btn--ghost:active:not(:disabled) {
  background: var(--is-active);
}

/* --- Icon only --- */
.btn--icon {
  width: var(--is-btn-h);
  height: var(--is-btn-h);
  padding: 0;
  border-radius: var(--is-r-md);
  background: transparent;
  color: var(--is-fg-secondary);
}

.btn--icon:hover:not(:disabled) {
  background: var(--is-hover);
  color: var(--is-fg-primary);
}

.btn--icon:active:not(:disabled) {
  background: var(--is-active);
}

/* --- Sizes --- */
.btn--sm {
  height: var(--is-btn-h-sm);
  padding: 0 var(--is-sp-2);
  font-size: var(--is-fs-sm);
  border-radius: var(--is-r-sm);
}

.btn--xs {
  height: var(--is-btn-h-xs);
  padding: 0 var(--is-sp-2);
  font-size: var(--is-fs-xs);
  border-radius: var(--is-r-sm);
}

/* --- Block --- */
.btn--block {
  width: 100%;
}

/* --- Danger modifier --- */
.btn--danger {
  color: var(--is-danger);
}

.btn--danger:hover:not(:disabled) {
  background: var(--is-danger-subtle);
  color: var(--is-danger);
}

/* ============================================================
   INPUTS
   ============================================================ */
.input {
  height: var(--is-input-h);
  padding: 0 var(--is-sp-2);
  font-size: var(--is-fs-md);
  color: var(--is-fg-primary);
  background: var(--is-input-bg);
  border: 1px solid var(--is-input-border);
  border-radius: var(--is-r-md);
  transition:
    border-color var(--is-dur-fast) var(--is-ease-out),
    box-shadow var(--is-dur-fast) var(--is-ease-out);
  width: 100%;
}

.input:hover:not(:disabled):not(:focus) {
  border-color: var(--is-fg-tertiary);
}

.input:focus {
  border-color: var(--is-input-focus);
  box-shadow: 0 0 0 3px var(--is-accent-subtle);
  outline: none;
}

.input::placeholder {
  color: var(--is-fg-placeholder);
}

.input--sm {
  height: var(--is-input-h-sm);
  font-size: var(--is-fs-sm);
  padding: 0 var(--is-sp-1);
}

/* --- Input with unit label --- */
.input-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.input-unit .input {
  padding-right: calc(var(--is-sp-2) + 2.5em);
}

.input-unit__label {
  position: absolute;
  right: var(--is-sp-2);
  font-size: var(--is-fs-xs);
  color: var(--is-fg-tertiary);
  pointer-events: none;
  user-select: none;
}

.input-unit--sm .input {
  padding-right: calc(var(--is-sp-1) + 2.2em);
  width: 72px;
  text-align: right;
}

.input-unit--sm .input-unit__label {
  right: var(--is-sp-1);
}

/* --- Input Color Picker --- */
.input-color {
  width: 28px;
  height: 28px;
  border-radius: var(--is-r-md);
  border: 2px solid var(--is-border-default);
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--is-dur-fast) var(--is-ease-out);
}

.input-color:hover {
  border-color: var(--is-fg-tertiary);
}

.input-color:focus {
  border-color: var(--is-input-focus);
  outline: none;
}

/* ============================================================
   RANGE SLIDER
   ============================================================ */
.range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--is-border-subtle);
  border-radius: var(--is-r-full);
  cursor: pointer;
  outline: none;
  transition: background var(--is-dur-fast) var(--is-ease-out);
}

.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--is-accent);
  border-radius: 50%;
  border: 2px solid var(--is-bg-panel);
  box-shadow: var(--is-shadow-sm);
  cursor: grab;
  transition:
    transform var(--is-dur-fast) var(--is-ease-out),
    box-shadow var(--is-dur-fast) var(--is-ease-out);
}

.range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: var(--is-shadow-md);
}

.range::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.05);
}

.range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--is-accent);
  border-radius: 50%;
  border: 2px solid var(--is-bg-panel);
  box-shadow: var(--is-shadow-sm);
  cursor: grab;
}

.range::-moz-range-track {
  background: var(--is-border-subtle);
  height: 4px;
  border-radius: var(--is-r-full);
}

.range-row {
  display: flex;
  align-items: center;
  gap: var(--is-sp-3);
}

.range-row .range {
  flex: 1;
  min-width: 0;
}

/* ============================================================
   RADIO / CHECKBOX
   ============================================================ */
.radio-group {
  display: flex;
  gap: var(--is-sp-1);
  flex-wrap: wrap;
}

.radio-label {
  display: inline-flex;
  align-items: center;
  gap: var(--is-sp-1);
  padding: var(--is-sp-1) var(--is-sp-2);
  font-size: var(--is-fs-sm);
  color: var(--is-fg-secondary);
  border: 1px solid var(--is-border-subtle);
  border-radius: var(--is-r-sm);
  cursor: pointer;
  user-select: none;
  transition:
    background var(--is-dur-fast) var(--is-ease-out),
    border-color var(--is-dur-fast) var(--is-ease-out),
    color var(--is-dur-fast) var(--is-ease-out);
}

.radio-label:hover {
  background: var(--is-hover);
  border-color: var(--is-border-default);
}

.radio-label:has(input:checked) {
  background: var(--is-accent-subtle);
  border-color: var(--is-accent);
  color: var(--is-accent);
  font-weight: var(--is-fw-medium);
}

.radio-label input[type="radio"] {
  display: none;
}

/* --- Toggle (Checkbox) --- */
.toggle {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 18px;
  background: var(--is-border-default);
  border-radius: var(--is-r-full);
  position: relative;
  cursor: pointer;
  transition: background var(--is-dur-normal) var(--is-ease-out);
  flex-shrink: 0;
}

.toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--is-shadow-xs);
  transition: transform var(--is-dur-normal) var(--is-ease-out);
}

.toggle:checked {
  background: var(--is-accent);
}

.toggle:checked::after {
  transform: translateX(14px);
}

.toggle-label {
  display: inline-flex;
  align-items: center;
  gap: var(--is-sp-2);
  font-size: var(--is-fs-sm);
  color: var(--is-fg-secondary);
  cursor: pointer;
  user-select: none;
}

/* ============================================================
   BADGES
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--is-sp-1) var(--is-sp-2);
  font-size: var(--is-fs-xs);
  font-weight: var(--is-fw-medium);
  line-height: 1;
  border-radius: var(--is-r-full);
  white-space: nowrap;
}

.badge--subtle {
  background: var(--is-badge-bg);
  color: var(--is-badge-fg);
}

.badge--accent {
  background: var(--is-accent-subtle);
  color: var(--is-accent);
}

.badge--success {
  background: var(--is-success-subtle);
  color: var(--is-success);
}

/* ============================================================
   FIELD (form group)
   ============================================================ */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--is-sp-1);
}

.field-label {
  font-size: var(--is-fs-sm);
  font-weight: var(--is-fw-medium);
  color: var(--is-fg-secondary);
  user-select: none;
}

.field-hint {
  font-size: var(--is-fs-xs);
  color: var(--is-fg-tertiary);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--is-sp-2);
}

.color-row {
  display: flex;
  align-items: center;
  gap: var(--is-sp-2);
}

.color-hex {
  font-size: var(--is-fs-sm);
  font-family: var(--is-font-mono);
  color: var(--is-fg-tertiary);
  min-width: 5.5em;
}

/* ============================================================
   UPLOAD ZONE
   ============================================================ */
.upload-zone {
  border: 2px dashed var(--is-border-default);
  border-radius: var(--is-r-xl);
  padding: var(--is-sp-6) var(--is-sp-4);
  text-align: center;
  cursor: pointer;
  transition:
    border-color var(--is-dur-normal) var(--is-ease-out),
    background var(--is-dur-normal) var(--is-ease-out),
    transform var(--is-dur-fast) var(--is-ease-out);
  user-select: none;
}

.upload-zone:hover {
  border-color: var(--is-accent);
  background: var(--is-accent-subtle);
}

.upload-zone:active {
  transform: scale(0.99);
}

.upload-zone.is-dragover {
  border-color: var(--is-accent);
  background: var(--is-accent-subtle);
  border-style: solid;
  transform: scale(1.01);
}

.upload-zone__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--is-sp-2);
  pointer-events: none;
}

.upload-zone__content svg {
  color: var(--is-fg-tertiary);
  transition: color var(--is-dur-normal) var(--is-ease-out);
}

.upload-zone:hover .upload-zone__content svg,
.upload-zone.is-dragover .upload-zone__content svg {
  color: var(--is-accent);
}

.upload-zone__content p {
  font-size: var(--is-fs-md);
  font-weight: var(--is-fw-medium);
  color: var(--is-fg-primary);
}

.upload-zone__sub {
  font-size: var(--is-fs-xs);
  color: var(--is-fg-tertiary);
}

/* ============================================================
   IMAGE LIST
   ============================================================ */
.image-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--is-sp-1);
  padding-bottom: var(--is-sp-2);
}

.image-count {
  font-size: var(--is-fs-sm);
  font-weight: var(--is-fw-medium);
  color: var(--is-fg-secondary);
}

.image-list-actions {
  display: flex;
  gap: var(--is-sp-1);
}

.image-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: var(--is-sp-2);
}

.image-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--is-r-md);
  overflow: hidden;
  background: var(--is-bg-inset);
  border: 2px solid transparent;
  cursor: pointer;
  transition:
    border-color var(--is-dur-fast) var(--is-ease-out),
    box-shadow var(--is-dur-fast) var(--is-ease-out),
    transform var(--is-dur-fast) var(--is-ease-out);
  animation: fade-in var(--is-dur-slow) var(--is-ease-out) both;
}

.image-item:hover {
  border-color: var(--is-border-default);
  box-shadow: var(--is-shadow-sm);
  transform: scale(1.04);
}

.image-item.selected {
  border-color: var(--is-accent);
  box-shadow: 0 0 0 2px var(--is-accent-subtle);
}

.image-item__thumb {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 3px;
  /* Transparent checkerboard */
  background-image:
    linear-gradient(45deg, var(--is-checkerboard-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--is-checkerboard-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--is-checkerboard-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--is-checkerboard-a) 75%);
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0;
}

.image-item__check {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: var(--is-r-sm);
  background: var(--is-accent);
  color: white;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--is-shadow-xs);
}

.image-item.selected .image-item__check {
  display: flex;
}

.image-item__remove {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  border-radius: var(--is-r-sm);
  background: rgba(0, 0, 0, 0.55);
  color: white;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  transition: background var(--is-dur-fast) var(--is-ease-out);
  padding: 0;
  border: none;
}

.image-item:hover .image-item__remove {
  display: flex;
}

.image-item__remove:hover {
  background: var(--is-danger);
}

.image-item__index {
  position: absolute;
  bottom: 2px;
  right: 3px;
  font-size: 9px;
  font-weight: var(--is-fw-bold);
  font-family: var(--is-font-mono);
  color: var(--is-fg-tertiary);
  opacity: 0.7;
  pointer-events: none;
}

/* ============================================================
   PRESET GRID (paper sizes)
   ============================================================ */
.preset-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--is-sp-1);
}

.preset-btn {
  display: inline-flex;
  align-items: center;
  padding: var(--is-sp-1) var(--is-sp-2);
  font-size: var(--is-fs-xs);
  font-weight: var(--is-fw-medium);
  color: var(--is-fg-secondary);
  background: var(--is-bg-inset);
  border: 1px solid var(--is-border-subtle);
  border-radius: var(--is-r-sm);
  cursor: pointer;
  user-select: none;
  transition:
    background var(--is-dur-fast) var(--is-ease-out),
    border-color var(--is-dur-fast) var(--is-ease-out),
    color var(--is-dur-fast) var(--is-ease-out);
}

.preset-btn:hover {
  background: var(--is-hover);
  border-color: var(--is-border-default);
  color: var(--is-fg-primary);
}

.preset-btn.active {
  background: var(--is-accent-subtle);
  border-color: var(--is-accent);
  color: var(--is-accent);
  font-weight: var(--is-fw-semibold);
}

/* ============================================================
   SHAPE OPTIONS
   ============================================================ */
.shape-options {
  display: flex;
  gap: var(--is-sp-1);
}

.shape-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--is-r-md);
  border: 1px solid var(--is-border-subtle);
  background: var(--is-bg-inset);
  color: var(--is-fg-secondary);
  cursor: pointer;
  user-select: none;
  transition:
    background var(--is-dur-fast) var(--is-ease-out),
    border-color var(--is-dur-fast) var(--is-ease-out),
    color var(--is-dur-fast) var(--is-ease-out);
}

.shape-btn:hover {
  background: var(--is-hover);
  border-color: var(--is-border-default);
  color: var(--is-fg-primary);
}

.shape-btn.active {
  background: var(--is-accent-subtle);
  border-color: var(--is-accent);
  color: var(--is-accent);
}

/* ============================================================
   BACKGROUND OPTIONS
   ============================================================ */
.bg-options {
  display: flex;
  gap: var(--is-sp-2);
}

.bg-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--is-sp-1);
  padding: var(--is-sp-2);
  border-radius: var(--is-r-md);
  border: 1px solid var(--is-border-subtle);
  background: transparent;
  color: var(--is-fg-secondary);
  font-size: var(--is-fs-xs);
  cursor: pointer;
  user-select: none;
  flex: 1;
  transition:
    background var(--is-dur-fast) var(--is-ease-out),
    border-color var(--is-dur-fast) var(--is-ease-out),
    color var(--is-dur-fast) var(--is-ease-out);
}

.bg-btn:hover {
  background: var(--is-hover);
  border-color: var(--is-border-default);
}

.bg-btn.active {
  background: var(--is-accent-subtle);
  border-color: var(--is-accent);
  color: var(--is-accent);
  font-weight: var(--is-fw-medium);
}

.bg-swatch {
  width: 24px;
  height: 24px;
  border-radius: var(--is-r-sm);
  border: 1px solid var(--is-border-default);
  flex-shrink: 0;
}

.bg-swatch--transparent {
  background-image:
    linear-gradient(45deg, #ccc 25%, transparent 25%),
    linear-gradient(-45deg, #ccc 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ccc 75%),
    linear-gradient(-45deg, transparent 75%, #ccc 75%);
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0;
}

.bg-swatch--white {
  background: #ffffff;
}

.bg-swatch--custom {
  width: 24px;
  height: 24px;
  border-radius: var(--is-r-sm);
  border: 1px solid var(--is-border-default);
}

/* ============================================================
   TOAST / NOTIFICATIONS
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: var(--is-sp-6);
  right: var(--is-sp-6);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--is-sp-2);
  z-index: var(--is-z-toast);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--is-sp-2);
  padding: var(--is-sp-3) var(--is-sp-4);
  background: var(--is-bg-raised);
  border: 1px solid var(--is-border-subtle);
  border-radius: var(--is-r-lg);
  box-shadow: var(--is-shadow-lg);
  font-size: var(--is-fs-md);
  color: var(--is-fg-primary);
  pointer-events: auto;
  animation: toast-in var(--is-dur-slow) var(--is-ease-out) both;
  max-width: 360px;
}

.toast.is-leaving {
  animation: toast-out var(--is-dur-normal) var(--is-ease-in) both;
}

.toast--success { border-left: 3px solid var(--is-success); }
.toast--warning { border-left: 3px solid var(--is-warning); }
.toast--error   { border-left: 3px solid var(--is-danger); }
.toast--info    { border-left: 3px solid var(--is-info); }

.toast__icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

.toast__message {
  flex: 1;
  min-width: 0;
  line-height: var(--is-lh-normal);
}

.toast__close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--is-r-sm);
  color: var(--is-fg-tertiary);
  cursor: pointer;
  transition: color var(--is-dur-fast) var(--is-ease-out);
  padding: 0;
  border: none;
  background: none;
}

.toast__close:hover {
  color: var(--is-fg-primary);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
}

/* ============================================================
   CANVAS TOOLBAR / ZOOM
   ============================================================ */
.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--is-sp-1) var(--is-sp-2);
  background: var(--is-bg-panel);
  border-bottom: 1px solid var(--is-border-subtle);
  min-height: 36px;
  flex-shrink: 0;
}

.toolbar-left,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--is-sp-1);
}

.zoom-label {
  font-size: var(--is-fs-xs);
  font-family: var(--is-font-mono);
  color: var(--is-fg-tertiary);
  min-width: 3.5em;
  text-align: center;
  user-select: none;
}

.sheet-info {
  font-size: var(--is-fs-xs);
  color: var(--is-fg-tertiary);
  user-select: none;
}

/* ============================================================
   CANVAS VIEWPORT
   ============================================================ */
.canvas-viewport {
  flex: 1;
  position: relative;
  overflow: auto;
  background: var(--is-bg-canvas);
  display: flex;
  align-items: center;
  justify-content: center;
}

.canvas-wrapper {
  position: relative;
  transition: transform var(--is-dur-fast) var(--is-ease-out);
  flex-shrink: 0;
  /* Prevent margin-auto centering from clipping top/left when overflowing */
  margin: auto;
}

.canvas-wrapper canvas {
  /* Checkerboard for transparent canvas */
  background-image:
    linear-gradient(45deg, var(--is-checkerboard-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--is-checkerboard-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--is-checkerboard-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--is-checkerboard-a) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  box-shadow: var(--is-shadow-lg);
  border-radius: var(--is-r-xs);
}

/* ---- Empty State ---- */
.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--is-sp-3);
  pointer-events: none;
  user-select: none;
}

.empty-state p {
  font-size: var(--is-fs-md);
  color: var(--is-fg-tertiary);
}

/* ============================================================
   SHEET PAGINATION
   ============================================================ */
.sheet-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--is-sp-2);
  padding: var(--is-sp-2);
  background: var(--is-bg-panel);
  border-top: 1px solid var(--is-border-subtle);
  flex-shrink: 0;
}

.sheet-page {
  font-size: var(--is-fs-sm);
  font-family: var(--is-font-mono);
  color: var(--is-fg-secondary);
  min-width: 4em;
  text-align: center;
  user-select: none;
}

/* ============================================================
   EXPORT OPTIONS
   ============================================================ */
.export-options {
  display: flex;
  flex-direction: column;
  gap: var(--is-sp-2);
  padding-top: var(--is-sp-3);
}

/* ============================================================
   LOGO
   ============================================================ */
.logo {
  display: flex;
  align-items: center;
  gap: var(--is-sp-2);
  font-size: var(--is-fs-lg);
  font-weight: var(--is-fw-bold);
  user-select: none;
}

.logo-icon {
  font-size: 1.25em;
  line-height: 1;
}

.logo-text {
  color: var(--is-fg-primary);
  letter-spacing: -0.02em;
}

/* ============================================================
   VIEW MODE TOGGLE
   ============================================================ */
.view-mode-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--is-bg-inset);
  border-radius: var(--is-r-md);
  padding: 2px;
}

.view-mode-toggle .btn--icon {
  width: 28px;
  height: 28px;
  border-radius: var(--is-r-sm);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--is-fg-tertiary);
  transition: background var(--is-dur-fast) var(--is-ease-out),
              color var(--is-dur-fast) var(--is-ease-out);
}

.view-mode-toggle .btn--icon:hover:not(:disabled) {
  color: var(--is-fg-secondary);
  background: var(--is-hover);
}

.view-mode-toggle .btn--icon.active {
  background: var(--is-bg-panel);
  color: var(--is-accent);
  box-shadow: var(--is-shadow-xs);
}

/* ============================================================
   HEADER SEPARATOR
   ============================================================ */
.header-sep {
  width: 1px;
  height: 20px;
  background: var(--is-border-subtle);
  margin: 0 var(--is-sp-1);
  flex-shrink: 0;
}

/* ============================================================
   LINK TOGGLE BUTTONS (for gap / padding H/V linking)
   ============================================================ */
.field-label--with-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--is-sp-2);
  font-size: var(--is-fs-sm);
  font-weight: var(--is-fw-medium);
  color: var(--is-fg-secondary);
}

.link-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  padding: 0 !important;
  border-radius: var(--is-r-sm);
  color: var(--is-fg-tertiary);
  transition: color var(--is-dur-fast) var(--is-ease-out),
              background var(--is-dur-fast) var(--is-ease-out);
}

.link-toggle-btn:hover:not(:disabled) {
  color: var(--is-accent);
  background: var(--is-accent-subtle);
}

.link-toggle-btn.is-linked {
  color: var(--is-accent);
}

.link-toggle-btn .icon-link,
.link-toggle-btn .icon-unlink {
  display: block;
  pointer-events: none;
}

/* Default state: show unlink, hide link */
.link-toggle-btn .icon-link {
  display: none;
}
.link-toggle-btn .icon-unlink {
  display: block;
}

/* Linked state: show link, hide unlink — controlled by JS via inline style */

/* ============================================================
   SCROLL MODE — Canvas Viewport
   ============================================================ */
.canvas-viewport.scroll-mode {
  overflow-y: auto;
  overflow-x: auto;
  /* In scroll mode, align to top so content doesn't get clipped above */
  align-items: flex-start;
  justify-content: flex-start;
}

.canvas-viewport.scroll-mode .canvas-wrapper {
  transform-origin: top left;
  /* Override auto-centering margin in scroll mode */
  margin: var(--is-sp-4);
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   LAYOUT MODE OPTIONS
   ============================================================ */
.layout-mode-options {
  display: flex;
  gap: var(--is-sp-1);
}

/* ============================================================
   SPINNER (for export loading)
   ============================================================ */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* ============================================================
   DRAG GHOST (for reordering, future)
   ============================================================ */
.drag-ghost {
  opacity: 0.6;
  transform: scale(0.9);
}

/* ============================================================
   PROGRESS BAR (for batch operations)
   ============================================================ */
.progress-bar {
  width: 100%;
  height: 3px;
  background: var(--is-border-subtle);
  border-radius: var(--is-r-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--is-accent);
  border-radius: var(--is-r-full);
  transition: width var(--is-dur-normal) var(--is-ease-out);
}