/* ==========================================================================
   Modernist Buttons (Labels Flush Left by System Specification)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  gap: 8px;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  line-height: 1.2;
  color: var(--color-text);
  background: transparent;
  border: 1px solid transparent;
  padding: 8px 14px;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn svg {
  flex-shrink: 0;
  display: block;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed !important;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-600);
  border-color: var(--color-accent-600);
}
.btn-primary:active:not(:disabled) {
  background: var(--color-accent-700);
}

.btn-secondary {
  background: var(--color-surface);
  border-color: var(--color-divider);
  color: var(--color-text);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-text);
}
.btn-secondary:active:not(:disabled) {
  background: color-mix(in srgb, var(--color-text) 14%, transparent);
}

.btn-ghost {
  color: var(--color-text);
  padding: 6px 10px;
}
.btn-ghost:hover:not(:disabled) {
  background: color-mix(in srgb, var(--color-text) 8%, transparent);
  color: var(--color-accent);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  justify-content: center;
}

.btn-block {
  width: 100%;
}

.btn.active, .btn-secondary.active {
  background: var(--color-accent-100);
  color: var(--color-accent-800);
  border-color: var(--color-accent);
}

/* ==========================================================================
   Tags & Badges
   ========================================================================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
}
.tag-accent {
  background: var(--color-accent-100);
  color: var(--color-accent-800);
  border: 1px solid var(--color-accent-300);
}
.tag-live {
  background: var(--color-accent);
  color: #fff;
}
.tag-neutral {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-divider-subtle);
}

/* ==========================================================================
   Modernist Architectural Control Card
   ========================================================================== */
.control-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--color-divider);
  padding-bottom: 8px;
  margin-bottom: 4px;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-num {
  color: var(--color-accent);
  font-weight: 800;
}

/* ==========================================================================
   Segmented Controls
   ========================================================================== */
.seg {
  display: flex;
  border: 1px solid var(--color-divider);
  background: var(--color-surface-card);
  overflow: hidden;
  width: 100%;
}

.seg-opt {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 6px;
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
  background: transparent;
  border: none;
  color: var(--color-text);
  transition: background 0.15s ease, color 0.15s ease;
}

.seg-opt + .seg-opt {
  border-left: 1px solid var(--color-divider);
}

.seg-opt:hover:not(.active) {
  background: var(--color-surface-hover);
}

.seg-opt.active {
  background: var(--color-accent);
  color: #ffffff;
}

/* ==========================================================================
   Field Form Controls
   ========================================================================== */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-text) 75%, transparent);
}

.label-badge {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  background: var(--color-surface-card);
  border: 1px solid var(--color-divider-subtle);
  padding: 1px 6px;
  color: var(--color-text);
}

.input {
  width: 100%;
  min-height: 36px;
  padding: 8px 10px;
  font-family: inherit;
  font-size: 13px;
  color: var(--color-text);
  background: var(--color-surface-card);
  border: 1px solid var(--color-divider);
  transition: border-color 0.15s ease;
}

.input:hover {
  border-color: var(--color-text);
}

.input:focus-visible {
  border-color: var(--color-accent);
}

textarea.input {
  min-height: 76px;
  resize: vertical;
  line-height: 1.4;
}

/* Custom Range Sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--color-divider);
  outline: none;
  margin: 8px 0;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border: 1px solid var(--color-bg);
  cursor: ew-resize;
  transition: transform 0.1s ease, background 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  background: var(--color-accent-600);
}

/* Color Inputs */
.color-row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--space-2);
  align-items: center;
}

input[type="color"] {
  -webkit-appearance: none;
  border: 1px solid var(--color-divider);
  width: 44px;
  height: 36px;
  cursor: pointer;
  background: transparent;
  padding: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: none;
}

/* Modernist Architectural Checkbox */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 4px 0;
}

.toggle-info {
  display: flex;
  flex-direction: column;
}

.toggle-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.toggle-desc {
  font-size: 11px;
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
}

.checkbox-modern {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-divider);
  background: var(--color-surface-card);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  display: grid;
  place-content: center;
}

.checkbox-modern:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.checkbox-modern:checked::after {
  content: "";
  width: 6px;
  height: 10px;
  border: solid #ffffff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--color-divider);
  background: var(--color-surface-card);
  padding: var(--space-4) var(--space-3);
  text-align: center;
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.upload-zone:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-100);
}

.upload-zone.drag-active {
  border-color: var(--color-accent);
  background: var(--color-accent-200);
  border-style: solid;
}

.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* ==========================================================================
   Layer Items List with Drag-and-Drop Reordering
   ========================================================================== */
.layers-container {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--color-divider-subtle);
  background: var(--color-surface-card);
  padding: 4px;
}

.layer-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: var(--color-bg);
  border: 1px solid var(--color-divider-subtle);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  position: relative;
}

.layer-card:hover {
  border-color: var(--color-divider);
  background: var(--color-surface-hover);
}

.layer-card.active {
  border-color: var(--color-accent);
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface);
}

.layer-card.multi-selected {
  border-color: var(--color-accent);
  border-left: 2px dashed var(--color-accent);
  background: var(--color-surface);
}

.layer-card.dragging {
  opacity: 0.35;
  background: var(--color-accent-100);
}

.layer-card.drop-target-before::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
  z-index: 10;
}

.layer-card.drop-target-after::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
  z-index: 10;
}

.layer-card-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.layer-drag-handle {
  cursor: grab;
  color: color-mix(in srgb, var(--color-text) 50%, transparent);
  padding: 2px;
  display: flex;
  align-items: center;
}

.layer-drag-handle:active {
  cursor: grabbing;
}

.layer-title-text {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.layer-card.active .layer-title-text {
  color: var(--color-accent-700);
  font-weight: 800;
}

.layer-card-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.mini-btn {
  background: transparent;
  border: 1px solid var(--color-divider-subtle);
  color: var(--color-text);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 10px;
}

.mini-btn:hover:not(:disabled) {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-surface);
}

.mini-btn.delete:hover:not(:disabled) {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.mini-btn:disabled {
  opacity: 0.2;
  cursor: not-allowed;
}

/* Layer Card Miniature Thumbnails & Modernist Type Icons */
.layer-thumb {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  border: 1px solid var(--color-divider-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 0px;
  background: var(--color-surface);
}

.layer-thumb.checkerboard {
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0px;
}

.layer-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 0px;
}

.layer-type-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
  background: var(--color-surface);
  border: 1px solid var(--color-divider-subtle);
  border-radius: 0px;
}

.layers-container.drag-over {
  border: 2px dashed var(--color-accent) !important;
  background: var(--color-accent-100) !important;
}

/* Collapsible Sub-panels */
.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 6px 0;
  border-top: 1px solid var(--color-divider-subtle);
  margin-top: 6px;
}

.collapsible-header span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text);
}

.collapsible-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-2);
}

.hidden {
  display: none !important;
}

/* ==========================================================================
   Keyboard Shortcuts Modal / Dialog
   ========================================================================== */
.dialog-backdrop {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, #000 60%, transparent);
  backdrop-filter: blur(2px);
  display: none;
  place-items: center;
  z-index: 10000;
  padding: var(--space-4);
}

.dialog-backdrop.open {
  display: grid;
}

.dialog {
  width: min(540px, 100%);
  background: var(--color-surface);
  border: 2px solid var(--color-divider);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--color-divider);
  padding-bottom: 8px;
}

.dialog-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 18px;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.shortcut-table th {
  text-align: left;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px;
  border-bottom: 2px solid var(--color-divider);
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
}

.shortcut-table td {
  padding: 6px;
  border-bottom: 1px solid var(--color-divider-subtle);
}

.kbd {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  background: var(--color-surface-card);
  border: 1px solid var(--color-divider);
  padding: 2px 6px;
  color: var(--color-text);
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10001;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--color-text);
  color: var(--color-bg);
  border-left: 4px solid var(--color-accent);
  padding: 10px 18px;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: toastIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   CueSmith Modernist Walkthrough & Onboarding Tour Engine
   Strict 0px border radius, high-contrast dividing rules, Archivo typography
   ========================================================================== */
.walkthrough-overlay-container {
  position: fixed;
  inset: 0;
  z-index: 10000;
  pointer-events: none;
  font-family: var(--font-body);
}

.walkthrough-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: auto;
  z-index: 10000;
}

.walkthrough-scrim {
  fill: rgba(20, 18, 17, 0.68);
  transition: fill 0.2s ease;
}

[data-theme="backstage"] .walkthrough-scrim {
  fill: rgba(8, 7, 6, 0.82);
}

#walkthrough-spotlight-cutout {
  transition: x 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              y 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              width 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              height 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

#walkthrough-spotlight-border {
  stroke: var(--color-accent);
  stroke-width: 2px;
  vector-effect: non-scaling-stroke;
  transition: x 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              y 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              width 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              height 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

.walkthrough-card {
  position: fixed;
  z-index: 10002;
  pointer-events: auto;
  width: 390px;
  max-width: calc(100vw - 32px);
  background: var(--color-surface-card);
  border: 2px solid var(--color-text);
  box-shadow: var(--shadow-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  color: var(--color-text);
  border-radius: 0 !important;
  transition: top 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              left 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.2s ease;
  animation: walkthroughCardIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
}

[data-theme="backstage"] .walkthrough-card {
  background: var(--color-surface-card);
  border-color: var(--color-divider);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.85);
}

@keyframes walkthroughCardIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.walkthrough-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.walkthrough-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  background: var(--color-accent-100);
  color: var(--color-accent-700);
  border: 1px solid var(--color-accent);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
  border-radius: 0 !important;
  white-space: nowrap;
}

[data-theme="backstage"] .walkthrough-badge {
  background: var(--color-accent-100);
  color: var(--color-accent-300);
  border-color: var(--color-accent);
}

.walkthrough-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  display: inline-block;
  border-radius: 0 !important;
}

.walkthrough-step-dots {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  padding: 0 4px;
}

.walkthrough-step-dot {
  height: 3px;
  flex: 1;
  background: var(--color-divider);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
  border-radius: 0 !important;
}

.walkthrough-step-dot:hover {
  background: var(--color-neutral-600);
}

.walkthrough-step-dot.active {
  background: var(--color-accent);
  transform: scaleY(1.6);
}

.walkthrough-step-dot.completed {
  background: var(--color-text);
  opacity: 0.45;
}

.walkthrough-close-btn {
  background: transparent;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.65;
  transition: opacity 0.15s ease, color 0.15s ease;
  border-radius: 0 !important;
}

.walkthrough-close-btn:hover {
  opacity: 1;
  color: var(--color-accent);
}

.walkthrough-card-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.walkthrough-title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.25;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.walkthrough-desc {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-text) 82%, transparent);
}

.walkthrough-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-divider-subtle);
  margin-top: 2px;
}

.walkthrough-kbd-hints {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-heading);
  font-weight: 600;
}

.walkthrough-kbd-hints .kbd {
  font-size: 10px;
  padding: 1px 4px;
}

.walkthrough-btn-row {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: flex-end;
}

.walkthrough-btn-row .btn {
  padding: 6px 12px;
  font-size: 12px;
}