/* Prompter application styles */
body {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 20;
}
.app-header::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--header-accent);
  pointer-events: none;
}

.header-group { display: flex; align-items: center; gap: 8px; }
.header-left { flex: 0 0 auto; }
.header-center {
  flex: 1 1 auto;
  min-width: 0;
  justify-content: center;
  gap: 10px;
}
.header-right { flex: 0 0 auto; justify-content: flex-end; flex-wrap: wrap; }

.button {
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-control);
  padding: 7px 12px;
  min-height: 36px;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.button:hover:not(:disabled) { background: var(--surface-2); }
.button:active:not(:disabled) { transform: translateY(1px); }
.button-quiet { border-color: transparent; background: transparent; }
.button-quiet:hover:not(:disabled) { background: var(--surface-2); }
.button-with-icon { display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
.button-icon { width: 18px; height: 18px; flex: 0 0 auto; display: block; }
.button-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.button-primary:hover:not(:disabled) { background: var(--accent-strong); }
.button-danger { color: var(--danger); border-color: var(--danger); }
.button-danger:hover:not(:disabled) { background: var(--danger-soft); }
.button-small { min-height: 30px; padding: 4px 9px; font-size: 13px; }

.select, .text-input, .search-input, .title-input {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-control);
  padding: 7px 10px;
  min-height: 36px;
}
.select { padding-right: 28px; }

.menu-wrap { position: relative; }
.menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 190px;
  padding: 6px;
  background: var(--menu-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow);
  z-index: 40;
}
.menu-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: calc(var(--radius-control) - 1px);
  background: transparent;
  color: var(--text);
  padding: 9px 10px;
}
.menu-item:hover:not(:disabled), .menu-item:focus-visible { background: var(--surface-2); }

.tab-title-input {
  flex: 1 1 auto;
  min-width: 80px;
  max-width: 190px;
  padding: 3px 4px;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-spacing);
  text-transform: var(--display-transform);
  font-size: 14px;
}
.tab-title-input:hover, .tab-title-input:focus {
  background: var(--surface-2);
  border-color: var(--border);
}
.document-status { color: var(--muted); font-size: 13px; flex: 0 0 auto; white-space: nowrap; }
.document-status.dirty { color: var(--accent-strong); }

.app-main {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
}
.app-main.directory-open {
  grid-template-columns: 44px 292px minmax(0, 1fr);
}

.directory-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
  padding: 10px 0;
  overflow-y: auto;
  background: var(--surface);
  box-shadow: inset -1px 0 0 var(--border);
}
.directory-rail-button {
  flex: 0 0 44px;
  width: 44px;
  min-height: 44px;
  padding: 0;
  border-color: transparent;
  border-radius: calc(var(--radius-control) - 2px);
}
.directory-rail-button .button-icon { width: 40px; height: 40px; }
.app-main.directory-open .directory-toggle { background: var(--surface-2); }
.layer-toggle[aria-expanded="true"] { background: var(--surface-2); }
.layer-toolbar {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 40px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius-control) + 1px);
  background: var(--surface-2);
  box-shadow: var(--shadow-small);
}
.layer-toolbar[hidden] { display: none; }
.layer-button {
  width: 32px;
  min-width: 32px;
  min-height: 28px;
  padding: 2px;
  border: 0;
  border-radius: calc(var(--radius-control) - 2px);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}
.layer-button:hover,
.layer-button:focus-visible { background: var(--surface); color: var(--text); }
.layer-button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.layer-toolbar-divider {
  height: 1px;
  margin: 3px 2px;
  background: var(--border);
}
.layer-action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  min-width: 32px;
  min-height: 28px;
  padding: 2px;
  border: 0;
  border-radius: calc(var(--radius-control) - 2px);
  background: transparent;
  color: var(--muted);
}
.layer-action-button:hover,
.layer-action-button:focus-visible { background: var(--surface); color: var(--text); }
.layer-action-icon { width: 18px; height: 18px; }

.directory {
  display: none;
  min-height: 0;
  overflow: auto;
  padding: 14px;
  background: var(--surface);
  border-right: 1px solid var(--border);
}
.app-main.directory-open .directory { display: block; }
.directory-toggle { display: inline-flex; }
.search-block { display: grid; gap: 6px; }
.field-label { color: var(--muted); font-size: 13px; font-weight: 600; }
.search-row { display: flex; gap: 6px; }
.search-input { flex: 1 1 auto; min-width: 0; }
.result-count { color: var(--muted); font-size: 12px; min-height: 18px; }

.document-list { display: grid; gap: 6px; margin-top: 8px; }
.document-item {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  border-radius: calc(var(--radius-control) + 1px);
  padding: 9px 10px;
}
.document-item:hover { background: var(--surface-2); }
.document-item[aria-current="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.document-item-title { display: block; font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.document-item-time { display: block; color: var(--muted); font-size: 12px; }

.directory-empty {
  margin-top: 12px;
  padding: 12px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-panel);
  color: var(--muted);
}
.directory-empty p { margin-bottom: 8px; }

.storage-warning {
  margin-bottom: 12px;
  padding: 10px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  border-radius: calc(var(--radius-control) + 1px);
  font-size: 13px;
}
.storage-warning p { margin-bottom: 6px; }

.directory-overlay { display: none; }

.workspace {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--canvas-bg);
}
.workspace.preview-open {
  grid-template-columns: minmax(0, 1fr) minmax(300px, 42%);
}
.editor-pane {
  grid-row: 2;
  grid-column: 1;
  min-width: 0;
  min-height: 0;
  overflow: auto;
}
.workspace.preview-open .editor-pane {
  border-right: 0;
}

.document-tabs {
  grid-row: 1;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: stretch;
  min-width: 0;
  min-height: 36px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.workspace.preview-open .document-tabs {
  grid-template-columns: minmax(0, 1fr) minmax(300px, 42%);
}
.document-tab-items {
  grid-column: 1;
  display: flex;
  align-items: stretch;
  min-width: 0;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}
.preview-tab-area {
  grid-column: 2;
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  min-width: 0;
}
.preview-label {
  display: flex;
  flex: 0 1 auto;
  align-items: center;
  gap: 6px;
  min-width: 140px;
  max-width: 260px;
  margin-right: auto;
  padding: 4px 4px 4px 8px;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  background: var(--canvas-bg);
  color: var(--text);
  box-shadow: inset 0 2px 0 var(--accent);
}
.preview-file-icon {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  color: var(--muted);
}
.preview-file-name {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-spacing);
  text-transform: var(--display-transform);
  font-size: 14px;
}
.preview-close { flex: 0 0 auto; }
.document-tabs .preview-toggle {
  flex: 0 0 auto;
  align-self: center;
  margin: 0 6px;
}
.document-tab {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  min-width: 120px;
  max-width: 260px;
  padding: 4px 4px 4px 8px;
  border-right: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
}
.document-tab.active {
  background: var(--canvas-bg);
  color: var(--text);
  box-shadow: inset 0 2px 0 var(--accent);
}
.document-tab-label {
  flex: 1 1 auto;
  min-width: 0;
  padding: 3px 4px;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.document-tab-label:hover { background: var(--surface-2); border-radius: 3px; }
.document-tab-close {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  padding: 0;
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: var(--muted);
  line-height: 1;
  font-size: 16px;
}
.document-tab-close:hover { background: var(--danger-soft); color: var(--danger); }
.document-tab.dirty::before {
  content: "●";
  flex: 0 0 auto;
  margin-right: 4px;
  color: var(--accent-strong);
  font-size: 8px;
}
.canvas {
  position: relative;
  min-height: 100%;
  width: 100%;
  outline: none;
  user-select: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
}
.canvas.grid-hidden { background-image: none; }

.canvas-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  text-align: center;
  color: var(--muted);
}

.selection-marquee {
  position: absolute;
  z-index: 80;
  border: 1px solid var(--selection);
  border-radius: 3px;
  background: rgba(255, 90, 0, 0.12);
  pointer-events: none;
}

.block {
  position: absolute;
  min-width: 140px;
  max-width: min(560px, calc(100% - 48px));
  padding: 4.5px 34px 5px 5px;
  border: 1px solid var(--block-border);
  border-radius: var(--radius-block);
  background: var(--block-bg);
  box-shadow: var(--shadow-small);
  cursor: default;
  user-select: none;
  touch-action: pan-y;
}
.block.hover-right { cursor: grab; }
.canvas.reordering .block:not(.dragging) {
  transition: top .12s ease, left .12s ease;
}
.canvas.reordering .composer:not(.dragging) {
  transition: top .12s ease;
}
.block:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}
.block.selected {
  outline: 2px solid var(--selection);
  outline-offset: -2px;
}
.block.layer-match { border-color: var(--accent); }
.block.layer-dimmed {
  opacity: .34;
  filter: grayscale(1);
}
.block.layer-dimmed .block-plus,
.block.layer-dimmed .drag-handle { visibility: hidden; }
.block.dragging { cursor: grabbing; box-shadow: var(--shadow); transition: none; }
.block.group-dragging { cursor: grabbing; box-shadow: var(--shadow); }
.canvas.reordering .block.group-dragging { transition: none; }
.block.editing { cursor: default; }
.block-text { display: flex; align-items: flex-start; gap: 7px; min-height: 24px; }
.block-collapse {
  position: absolute;
  top: 4px;
  left: -30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: calc(var(--radius-control) - 2px);
  background: transparent;
  color: var(--muted);
  line-height: 1;
}
.block-collapse svg {
  display: block;
  width: 18px;
  height: 18px;
}
.block-collapse:hover,
.block-collapse:focus-visible {
  background: var(--surface-2);
  color: var(--text);
}
.block-collapse.collapsed { color: var(--accent-strong); }
.block-marker {
  flex: 0 0 auto;
  border: 0;
  background: var(--surface-2);
  color: var(--accent-strong);
  border-radius: calc(var(--radius-control) - 2px);
  padding: 2px 6px;
  font-weight: 700;
  min-height: 24px;
  font-size: 13px;
  opacity: 1;
  transition: opacity .12s ease;
}
.block-marker.none { background: transparent; color: var(--muted); min-width: 24px; }
.composer-marker.none {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
  min-width: 24px;
  min-height: 24px;
  padding: 2px 6px;
}
.block-marker.none:hover,
.composer-marker.none:hover { background: var(--surface-2); }
.block-content {
  flex: 1 1 auto;
  min-width: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  user-select: text;
  padding-top: 1px;
}
.block-content:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}
.block-edit-input {
  display: block;
  flex: 1 1 auto;
  width: 100%;
  min-width: 60px;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 1px 0;
  outline: none;
  resize: none;
  overflow: hidden;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  line-height: inherit;
}
.block-image-block { padding-right: 10px; }
.block-image-wrap {
  position: relative;
  max-width: min(520px, calc(100vw - 420px));
  min-width: 120px;
  border-radius: calc(var(--radius-control) - 1px);
  overflow: hidden;
  background: var(--image-bg);
}
.block-image { width: 100%; height: auto; max-height: 420px; object-fit: contain; }
.block-image-placeholder {
  display: grid;
  place-content: center;
  min-height: 90px;
  padding: 12px;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
}
.block-plus {
  position: absolute;
  right: -12px;
  left: auto;
  bottom: -12px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--accent-strong);
  font-weight: 800;
  line-height: 1;
  box-shadow: var(--shadow-small);
  z-index: 5;
  opacity: 1;
  transition: opacity .12s ease;
}

@media (hover: hover) {
  .block-plus {
    opacity: 0;
    pointer-events: none;
  }
  .block.hover-right .block-plus,
  .block:focus-visible .block-plus,
  .block-plus:focus-visible {
    opacity: 1;
    pointer-events: auto;
  }
}
.block-delete {
  position: absolute;
  right: -9px;
  bottom: 14px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--danger);
  font-size: 14px;
  line-height: 1;
  box-shadow: var(--shadow-small);
  z-index: 5;
  opacity: 1;
}
.block-delete:hover { background: var(--danger-soft); }

@media (hover: hover) {
  .block-delete {
    opacity: 0;
    pointer-events: none;
  }
  .block.hover-right .block-delete,
  .block:focus-visible .block-delete,
  .block-delete:focus-visible {
    opacity: 1;
    pointer-events: auto;
  }
}
.drag-handle {
  position: absolute;
  right: 6px;
  top: 50%;
  bottom: auto;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: grab;
  font-size: 12px;
  line-height: 1;
  touch-action: none;
}

.composer {
  position: absolute;
  z-index: 10;
  min-width: 220px;
  max-width: min(560px, calc(100% - 32px));
  padding: 9px 10px;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-block);
  background: var(--block-bg);
  box-shadow: var(--shadow);
  display: flex;
  align-items: flex-start;
  gap: 7px;
}
.composer:focus-within {
  border-color: var(--accent);
}
.composer-body { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; }
.composer-input {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 2px 0;
  outline: none;
  resize: none;
  overflow: hidden;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  line-height: inherit;
}
.composer-detection { font-size: 11px; color: var(--muted); margin-top: 2px; white-space: normal; }
.composer-handle {
  flex: 0 0 auto;
  align-self: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: grab;
  font-size: 12px;
  line-height: 1;
  touch-action: none;
}
.composer.dragging {
  z-index: 30;
  box-shadow: var(--shadow);
  cursor: grabbing;
}

.marker-menu {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 90;
  display: grid;
  grid-template-columns: repeat(4, 48px);
  gap: 4px;
  max-height: min(360px, calc(100vh - 16px));
  overflow-y: auto;
  min-width: 0;
  padding: 6px;
}
.marker-menu .marker-menu-item {
  width: 100%;
  text-align: center;
  padding: 7px 10px;
  min-width: 42px;
  white-space: nowrap;
}
.marker-menu .marker-menu-item[aria-checked="true"] {
  background: var(--surface-2);
  font-weight: 700;
}
.marker-menu .marker-menu-item[aria-checked="true"]::before {
  content: "✓ ";
  color: var(--accent-strong);
}

.preview-toggle {
  width: 40px;
  min-width: 40px;
  padding: 0;
}
.preview-toggle[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.workspace.preview-open .preview-view:not([hidden]) {
  border-left: 1px solid var(--border);
}
.preview-view {
  grid-row: 2;
  grid-column: 2;
  min-width: 0;
  min-height: 0;
  overflow: auto;
  padding: 0 0 32px;
  background: var(--canvas-bg);
}
.preview-content { max-width: 760px; margin: 0 auto; padding: 20px 24px 0; user-select: text; }
.preview-content h1 { font-family: var(--font-display); font-size: 1.55em; margin: .6em 0 .3em; }
.preview-content h2 { font-family: var(--font-display); font-size: 1.3em; margin: .6em 0 .3em; }
.preview-content h3 { font-family: var(--font-display); font-size: 1.12em; margin: .6em 0 .3em; }
.preview-content p { margin: .45em 0; }
.preview-content ul, .preview-content ol { margin: .45em 0; padding-left: 1.6em; }
.preview-content blockquote {
  margin: .5em 0;
  padding: .1em 0 .1em .9em;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}
.preview-content pre {
  margin: .6em 0;
  padding: 10px;
  background: var(--surface-2);
  border-radius: var(--radius-control);
  overflow: auto;
  white-space: pre-wrap;
}
.preview-content code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.preview-content table { border-collapse: collapse; margin: .6em 0; width: 100%; }
.preview-content th, .preview-content td { border: 1px solid var(--border); padding: 6px 8px; text-align: left; }
.preview-content img { max-width: 100%; height: auto; border-radius: var(--radius-control); margin: .5em 0; }
.preview-content .katex { font-size: 1.05em; }
.preview-content .katex-display { margin: .7em 0; overflow-x: auto; overflow-y: hidden; }
.preview-content .preview-math-display { max-width: 100%; overflow-x: auto; }
.preview-content .preview-math-display .katex-display { margin: .6em 0; }
.preview-content .missing-image {
  display: inline-block;
  padding: 6px 9px;
  border: 1px dashed var(--danger);
  color: var(--danger);
  border-radius: calc(var(--radius-control) - 1px);
  margin: .4em 0;
}
.preview-empty { color: var(--muted); padding: 18px 0; }

.dialog {
  width: min(520px, calc(100vw - 28px));
  border: 1px solid var(--border);
  border-radius: var(--radius-dialog);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  padding: 18px;
}
.dialog-wide { width: min(820px, calc(100vw - 28px)); }
.dialog::backdrop { background: var(--overlay); }
.dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.dialog-header h2 {
  font-family: var(--font-display);
  letter-spacing: var(--display-spacing);
  font-size: 18px;
}
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.conflict-list {
  margin: 12px 0 0;
  padding: 10px 12px 10px 28px;
  max-height: 220px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface-2);
}
.conflict-list li { overflow-wrap: anywhere; }
.settings-body { display: grid; gap: 12px; justify-items: start; }
.settings-body .select, .settings-body .text-input { min-width: 220px; }
.check-row { display: flex; align-items: center; gap: 8px; }
.version-info { display: grid; grid-template-columns: auto auto; gap: 4px 16px; color: var(--muted); font-size: 13px; }
.version-info dd { color: var(--text); }
.manual-copy-text { width: 100%; min-height: 240px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }

.toast-region {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  display: grid;
  gap: 8px;
  z-index: 90;
  pointer-events: none;
}
.toast {
  padding: 9px 14px;
  border-radius: 999px;
  background: var(--toast-bg);
  color: var(--toast-text);
  box-shadow: var(--shadow);
  font-size: 13px;
}
.alert-region { position: fixed; top: 68px; left: 50%; transform: translateX(-50%); z-index: 95; display: grid; gap: 8px; }
.alert {
  padding: 10px 14px;
  border-radius: calc(var(--radius-control) + 1px);
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid var(--danger);
  box-shadow: var(--shadow-small);
}

@media (max-width: 1100px) {
  .app-header { flex-wrap: wrap; }
  .header-center { flex: 1 1 auto; width: auto; order: 0; }
  .header-right { margin-left: auto; }
}

@media (max-width: 900px) {
  .app-main.directory-open { grid-template-columns: 44px 250px minmax(0, 1fr); }
  .workspace.preview-open { grid-template-columns: minmax(0, 1fr) minmax(260px, 40%); }
  .workspace.preview-open .document-tabs {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 40%);
  }
  .block-image-wrap { max-width: min(420px, calc(100vw - 310px)); }
}

@media (max-width: 768px) {
  .app-main,
  .app-main.directory-open { grid-template-columns: 44px minmax(0, 1fr); }
  .directory-rail { position: relative; z-index: 65; }
  .directory {
    display: block;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 44px;
    width: min(320px, calc(100vw - 44px));
    z-index: 60;
    transform: translateX(calc(-100% - 44px));
    transition: transform .2s ease;
    box-shadow: var(--shadow);
  }
  .directory.open { transform: translateX(0); }
  .directory-overlay:not([hidden]) {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 55;
    background: var(--overlay);
  }
  .workspace.preview-open { grid-template-columns: minmax(0, 1fr); }
  .workspace.preview-open .document-tabs {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .workspace.preview-open .preview-view:not([hidden]) {
    position: absolute;
    inset: 0 0 0 auto;
    z-index: 30;
    width: min(430px, 100%);
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .block-image-wrap { max-width: min(520px, calc(100vw - 50px)); }
}

@media (max-width: 560px) {
  .app-header { flex-wrap: wrap; gap: 6px; padding: 7px 8px; }
  .header-left, .header-right { gap: 6px; }
  .header-center { flex: 0 0 auto; width: auto; }
  .header-right { margin-left: auto; }
  .document-status { display: none; }
  .app-header .button {
    min-width: 44px;
    min-height: 44px;
    padding: 0 8px;
    font-size: 13px;
  }
  .app-header .button-with-icon { width: 44px; padding: 0; }
  .app-header .button-label {
    position: absolute !important;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0);
    white-space: nowrap; border: 0;
  }
  .app-header .button-icon { width: 21px; height: 21px; }
  .app-header .select { min-height: 44px; height: 44px; width: 104px; padding-left: 6px; padding-right: 22px; }
  .block { max-width: calc(100% - 48px); }
  .block-image-wrap { max-width: calc(100vw - 44px); }
  .preview-content { padding: 14px 14px 0; }
  .document-tab { min-width: 110px; max-width: 200px; }
  .preview-label { min-width: 0; max-width: 110px; padding: 0 6px; }
  .document-tabs .preview-toggle {
    width: 44px;
    min-width: 44px;
    min-height: 44px;
  }
}