/* ==== Quick Access Toolbar ==== */
.qat {
  display: flex;
  align-items: center;
  padding: 1px 4px;
  background: var(--sz-color-active-title);
  gap: 1px;
  flex-shrink: 0;
  min-height: 20px;
}

.qat-btn {
  width: 20px;
  height: 18px;
  border: none;
  background: transparent;
  cursor: default;
  font-size: 11px;
  line-height: 18px;
  text-align: center;
  color: var(--sz-color-title-text);
  border-radius: 2px;
  padding: 0;
}

.qat-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

.qat-btn:active {
  background: rgba(0, 0, 0, 0.15);
}

/* ==== Ribbon Tab Bar ==== */
.ribbon-tabs {
  flex-shrink: 0;
  background: var(--sz-color-button-face);
  border-bottom: 1px solid var(--sz-color-button-shadow);
}

.ribbon-tab-bar {
  display: flex;
  align-items: flex-end;
  padding: 0 2px;
  gap: 0;
}

.ribbon-file-btn {
  padding: 4px 14px;
  font-size: 11px;
  font-weight: bold;
  border: none;
  background: var(--sz-color-highlight);
  color: var(--sz-color-highlight-text);
  cursor: default;
  border-radius: 3px 3px 0 0;
  margin-right: 2px;
}

.ribbon-file-btn:hover {
  filter: brightness(1.1);
}

.ribbon-tab {
  padding: 4px 12px;
  font-size: 11px;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--sz-color-button-text);
  cursor: default;
  border-radius: 3px 3px 0 0;
  position: relative;
  top: 1px;
}

.ribbon-tab:hover {
  background: var(--sz-color-button-highlight);
  border-color: var(--sz-color-button-shadow);
}

.ribbon-tab.active {
  background: var(--sz-color-window);
  border-color: var(--sz-color-button-shadow);
  color: var(--sz-color-window-text);
  font-weight: bold;
}

/* ==== Backstage (File menu) ==== */
.backstage {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5000;
  background: rgba(0, 0, 0, 0.3);
}

.backstage.visible {
  display: flex;
}

.backstage-sidebar {
  width: 220px;
  background: var(--sz-color-highlight);
  display: flex;
  flex-direction: column;
  padding: 4px 0;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}

.backstage-back {
  border: none;
  background: transparent;
  color: var(--sz-color-highlight-text);
  font-size: 18px;
  padding: 8px 16px;
  text-align: left;
  cursor: default;
}

.backstage-back:hover {
  background: rgba(255, 255, 255, 0.15);
}

.backstage-item {
  border: none;
  background: transparent;
  color: var(--sz-color-highlight-text);
  font-size: 12px;
  padding: 8px 24px;
  text-align: left;
  cursor: default;
  width: 100%;
}

.backstage-item:hover {
  background: rgba(255, 255, 255, 0.15);
}

.backstage-sep {
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
  margin: 4px 12px;
}

.backstage-spacer {
  flex: 1;
}

.backstage-exit {
  margin-top: auto;
}

/* ==== Ribbon Panels ==== */
.ribbon-panel {
  display: none;
  flex-direction: row;
  align-items: stretch;
  padding: 2px 4px 0;
  background: var(--sz-color-window);
  border-bottom: 1px solid var(--sz-color-button-shadow);
  flex-shrink: 0;
  min-height: 82px;
  overflow-x: auto;
  overflow-y: hidden;
  user-select: none;
}

.ribbon-panel.active {
  display: flex;
}

.ribbon-panel::-webkit-scrollbar {
  height: 4px;
}

.ribbon-panel::-webkit-scrollbar-thumb {
  background: var(--sz-color-button-shadow);
  border-radius: 2px;
}

.ribbon-group {
  display: flex;
  flex-direction: column;
  padding: 2px 4px 0;
  min-width: 0;
  flex-shrink: 0;
}

.ribbon-group-content {
  display: flex;
  align-items: flex-start;
  gap: 2px;
  flex: 1;
  min-height: 0;
}

.ribbon-group-label {
  text-align: center;
  font-size: 9px;
  color: var(--sz-color-gray-text);
  padding: 1px 4px 2px;
  white-space: nowrap;
  border-top: 1px solid var(--sz-color-button-light, transparent);
}

.ribbon-sep {
  width: 1px;
  background: var(--sz-color-button-shadow);
  margin: 2px 3px;
  align-self: stretch;
  flex-shrink: 0;
  opacity: 0.4;
}

/* ==== Ribbon Buttons ==== */
.rb-btn {
  border: 1px solid transparent;
  background: transparent;
  cursor: default;
  color: var(--sz-color-button-text);
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1px 3px;
  border-radius: 2px;
  white-space: nowrap;
}

.rb-btn:hover {
  background: var(--sz-color-button-highlight);
  border-color: var(--sz-color-button-shadow);
}

.rb-btn:active {
  background: var(--sz-color-button-shadow);
}

.rb-btn.active {
  background: var(--sz-color-highlight);
  color: var(--sz-color-highlight-text);
  border-color: var(--sz-color-button-shadow);
}

.rb-btn-lg {
  flex-direction: column;
  padding: 4px 8px;
  min-width: 44px;
  height: 100%;
  gap: 2px;
}

.rb-btn-lg .rb-icon-lg {
  font-size: 20px;
  line-height: 1;
}

.rb-btn-lg .rb-label {
  font-size: 9px;
}

.rb-btn-sm {
  gap: 4px;
  padding: 1px 4px;
  min-height: 20px;
  justify-content: flex-start;
}

.rb-btn-sm .rb-icon {
  font-size: 12px;
  width: 16px;
  text-align: center;
  flex-shrink: 0;
}

.rb-btn-sm .rb-label {
  font-size: 10px;
}

.rb-fmt {
  min-width: 22px;
  height: 22px;
  padding: 0 3px;
  font-size: 12px;
  line-height: 22px;
}

.rb-stack {
  display: flex;
  flex-direction: column;
  gap: 1px;
  justify-content: flex-start;
}

.rb-row {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}

.rb-sep-v {
  width: 1px;
  height: 18px;
  background: var(--sz-color-button-shadow);
  margin: 0 2px;
  opacity: 0.3;
  flex-shrink: 0;
}

.rb-select {
  height: 22px;
  padding: 1px 4px;
  font-size: 11px;
  border: 1px solid var(--sz-color-button-shadow);
  background: var(--sz-color-window);
  color: var(--sz-color-window-text);
  cursor: default;
  border-radius: 2px;
}

.rb-check-label,
.rb-radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  padding: 2px 4px;
  cursor: default;
  white-space: nowrap;
  min-height: 18px;
}

.rb-check-label:hover,
.rb-radio-label:hover {
  background: var(--sz-color-button-highlight);
  border-radius: 2px;
}

.rb-zoom-row {
  align-items: center;
  gap: 4px;
}

.rb-zoom-slider {
  width: 100px;
  height: 14px;
  cursor: default;
}

.rb-zoom-value {
  font-size: 10px;
  min-width: 36px;
  text-align: center;
}