.chatpapers-root {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px;
  min-height: 0;
  box-sizing: border-box;
  font-size: 13px;
  -moz-user-select: text;
  user-select: text;
}

.chatpapers-pane-body {
  min-height: 0 !important;
}

/*
 * Item pane section header buttons (open in window, adaptive height).
 * Icons use fill="context-fill" like native Zotero toolbar SVGs.
 */
collapsible-section[custom][data-pane="chatpapers-chat"] > .head toolbarbutton.section-custom-button,
collapsible-section[custom][data-pane="chatpapers-lecture"] > .head toolbarbutton.section-custom-button,
collapsible-section.chatpapers-adaptive-height > .head toolbarbutton.section-custom-button,
collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom-button {
  -moz-context-properties: fill, fill-opacity;
  fill: currentColor;
  color: inherit;
}

@media (prefers-color-scheme: light) {
  collapsible-section[custom][data-pane="chatpapers-chat"] > .head toolbarbutton.section-custom-button,
  collapsible-section[custom][data-pane="chatpapers-lecture"] > .head toolbarbutton.section-custom-button,
  collapsible-section.chatpapers-adaptive-height > .head toolbarbutton.section-custom-button,
  collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom-button {
    list-style-image: var(--custom-button-icon-light);
  }
}

@media (prefers-color-scheme: dark) {
  collapsible-section[custom][data-pane="chatpapers-chat"] > .head toolbarbutton.section-custom-button,
  collapsible-section[custom][data-pane="chatpapers-lecture"] > .head toolbarbutton.section-custom-button,
  collapsible-section.chatpapers-adaptive-height > .head toolbarbutton.section-custom-button,
  collapsible-section.chatpapers-fixed-height > .head toolbarbutton.section-custom-button {
    list-style-image: var(--custom-button-icon-dark);
  }
}

collapsible-section.chatpapers-adaptive-height[open] {
  --open-height: auto;
}

collapsible-section.chatpapers-adaptive-height[open] > :not(.head) .chatpapers-pane-body {
  max-height: none;
  overflow: visible;
}

collapsible-section.chatpapers-fixed-height[open] > :not(.head) .chatpapers-pane-body {
  overflow-y: auto;
}

#chatpapers-window-chat-root,
#chatpapers-window-lecture-root {
  display: flex;
  flex-direction: column;
  min-height: 0;
  box-sizing: border-box;
}

collapsible-section:not([open]) > :not(.head) .chatpapers-root,
collapsible-section:not([open]) > :not(.head) .chatpapers-lecture-root {
  min-height: 0 !important;
  padding-block: 0;
  overflow: hidden;
}

collapsible-section[open] > :not(.head) .chatpapers-root {
  min-height: 240px;
}

collapsible-section[open] > :not(.head) .chatpapers-lecture-root {
  min-height: 320px;
}

.chatpapers-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chatpapers-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #1f7a8c;
  font-weight: 700;
  font-size: 13px;
}

.chatpapers-brand-icon {
  flex-shrink: 0;
}

.chatpapers-title-row {
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.chatpapers-title {
  font-weight: 600;
  line-height: 1.3;
}

.chatpapers-meta {
  display: flex;
  align-items: center;
  gap: 5px;
  opacity: 0.7;
  font-size: 12px;
}

.chatpapers-meta-icon {
  flex-shrink: 0;
  opacity: 0.85;
}

.chatpapers-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 28px 16px;
  text-align: center;
  opacity: 0.72;
}

.chatpapers-empty-icon {
  color: #1f7a8c;
  opacity: 0.85;
  margin-bottom: 4px;
}

.chatpapers-empty-title {
  font-weight: 600;
  font-size: 13px;
}

.chatpapers-empty-desc {
  font-size: 12px;
  max-width: 220px;
  line-height: 1.4;
}

.chatpapers-icon {
  display: block;
  flex-shrink: 0;
}

.chatpapers-role-left {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.chatpapers-role-icon {
  opacity: 0.9;
}

.chatpapers-copy {
  appearance: none;
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
  background: color-mix(in srgb, currentColor 6%, transparent);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 11px;
  cursor: pointer;
  color: inherit;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.chatpapers-copy:hover {
  background: color-mix(in srgb, currentColor 14%, transparent);
}

.chatpapers-status {
  min-height: 1.2em;
  font-size: 12px;
  opacity: 0.85;
  display: flex;
  align-items: flex-start;
  gap: 5px;
}

.chatpapers-status-icon {
  display: inline-flex;
  margin-top: 1px;
  flex-shrink: 0;
}

.chatpapers-status[data-kind="warn"] {
  color: #b45309;
}

.chatpapers-status[data-kind="error"] {
  color: #b91c1c;
}

.chatpapers-status[data-kind="info"] .chatpapers-status-icon {
  color: #2563eb;
}

.chatpapers-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chatpapers-composer {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 8px;
}

.chatpapers-composer .chatpapers-input {
  flex: 1 1 auto;
  width: auto;
  min-width: 0;
  min-height: 72px;
  resize: vertical;
}

.chatpapers-actions {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  flex-wrap: nowrap;
  gap: 6px;
  flex-shrink: 0;
  align-self: stretch;
}

.chatpapers-actions .chatpapers-btn {
  justify-content: center;
  min-width: 4.5em;
  white-space: nowrap;
}

.chatpapers-btn {
  appearance: none;
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
  background: color-mix(in srgb, currentColor 6%, transparent);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  font: inherit;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  line-height: 1;
}

.chatpapers-btn-label {
  line-height: 1.2;
}

.chatpapers-btn:hover:not(:disabled) {
  background: color-mix(in srgb, currentColor 12%, transparent);
}

.chatpapers-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.chatpapers-primary {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
}

.chatpapers-primary:hover:not(:disabled) {
  background: #1d4ed8;
}

.chatpapers-messages {
  flex: 1 1 auto;
  min-height: 0;
  max-height: min(420px, 45vh);
  overflow: auto;
  border: 1px solid color-mix(in srgb, currentColor 18%, transparent);
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: color-mix(in srgb, currentColor 4%, transparent);
  -moz-user-select: text !important;
  user-select: text !important;
  cursor: text;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, currentColor 35%, transparent) transparent;
}

.chatpapers-messages::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.chatpapers-messages::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, currentColor 32%, transparent);
  border-radius: 999px;
}

.chatpapers-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chatpapers-bubble {
  padding: 8px 10px;
  border-radius: 8px;
  word-break: break-word;
  overflow-wrap: anywhere;
  -moz-user-select: text !important;
  user-select: text !important;
  cursor: text;
}

.chatpapers-bubble .chatpapers-table-wrap {
  word-break: normal;
  overflow-wrap: normal;
}

.chatpapers-content {
  -moz-user-select: text !important;
  user-select: text !important;
  cursor: text;
  white-space: pre-wrap;
}

.chatpapers-content.chatpapers-md {
  white-space: normal;
  line-height: 1.4;
}

.chatpapers-md > :first-child {
  margin-top: 0 !important;
}

.chatpapers-md > :last-child {
  margin-bottom: 0 !important;
}

.chatpapers-md h1,
.chatpapers-md h2,
.chatpapers-md h3,
.chatpapers-md h4 {
  margin: 0.45em 0 0.15em;
  line-height: 1.25;
  font-weight: 700;
}

.chatpapers-md h1 {
  font-size: 1.15em;
}

.chatpapers-md h2 {
  font-size: 1.08em;
}

.chatpapers-md h3,
.chatpapers-md h4 {
  font-size: 1.02em;
}

.chatpapers-md p {
  margin: 0.2em 0;
}

.chatpapers-md ul,
.chatpapers-md ol {
  margin: 0.2em 0;
  padding-left: 1.35em;
}

.chatpapers-md li {
  margin: 0;
}

.chatpapers-md li + li {
  margin-top: 0.1em;
}

.chatpapers-md code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  padding: 0.05em 0.3em;
  border-radius: 4px;
  background: color-mix(in srgb, currentColor 10%, transparent);
}

.chatpapers-md pre {
  margin: 0.35em 0;
  padding: 6px 8px;
  border-radius: 6px;
  overflow: auto;
  background: color-mix(in srgb, currentColor 8%, transparent);
  border: 1px solid color-mix(in srgb, currentColor 12%, transparent);
}

.chatpapers-md pre code {
  padding: 0;
  background: transparent;
  font-size: 0.88em;
}

.chatpapers-md blockquote {
  margin: 0.3em 0;
  padding: 0 0.65em;
  border-left: 3px solid color-mix(in srgb, currentColor 35%, transparent);
  opacity: 0.92;
}

.chatpapers-md blockquote p {
  margin: 0.15em 0;
}

.chatpapers-md hr {
  border: none;
  border-top: 1px solid color-mix(in srgb, currentColor 18%, transparent);
  margin: 0.4em 0;
}

.chatpapers-md a {
  color: #2563eb;
  text-decoration: underline;
}

.chatpapers-md strong {
  font-weight: 700;
}

.chatpapers-md em {
  font-style: italic;
}

.chatpapers-table-wrap {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin: 0.45em 0;
  -webkit-overflow-scrolling: touch;
}

.chatpapers-md table.chatpapers-table,
.chatpapers-md .chatpapers-table {
  width: max-content;
  min-width: 100%;
  max-width: none;
  border-collapse: collapse;
  table-layout: auto;
  font-size: 0.92em;
  line-height: 1.35;
  word-break: normal;
  overflow-wrap: normal;
}

.chatpapers-md .chatpapers-table th,
.chatpapers-md .chatpapers-table td {
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
  padding: 0.35em 0.55em;
  vertical-align: top;
  white-space: normal;
  word-break: break-word;
}

.chatpapers-md .chatpapers-table th {
  font-weight: 700;
  background: color-mix(in srgb, currentColor 10%, transparent);
  text-align: left;
}

.chatpapers-md .chatpapers-table tbody tr:nth-child(even) td {
  background: color-mix(in srgb, currentColor 4%, transparent);
}

.chatpapers-math-inline {
  display: inline;
  vertical-align: middle;
}

.chatpapers-math-block {
  display: block;
  margin: 0.35em 0;
  overflow-x: auto;
  text-align: center;
}

.chatpapers-math math {
  font-size: 1.05em;
}

.chatpapers-math-block math {
  font-size: 1.1em;
}

.chatpapers-tex {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  padding: 0.05em 0.3em;
  border-radius: 4px;
  background: color-mix(in srgb, currentColor 10%, transparent);
}

.chatpapers-user {
  background: color-mix(in srgb, #3b82f6 18%, transparent);
  align-self: flex-end;
  max-width: 92%;
}

.chatpapers-assistant {
  background: color-mix(in srgb, currentColor 8%, transparent);
  align-self: flex-start;
  max-width: 96%;
}

.chatpapers-role {
  font-size: 11px;
  opacity: 0.65;
  margin-bottom: 4px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  -moz-user-select: none;
  user-select: none;
}

.chatpapers-input {
  width: 100%;
  box-sizing: border-box;
  resize: vertical;
  min-height: 64px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
  padding: 8px;
  font: inherit;
  background: transparent;
  color: inherit;
  -moz-user-select: text;
  user-select: text;
}

.chatpapers-loading {
  padding: 12px;
  opacity: 0.7;
}

.chatpapers-pref-hint {
  opacity: 0.8;
  font-size: 12px;
  margin: 4px 0 10px;
  max-width: 52em;
}

.chatpapers-multi-root {
  height: 100%;
  min-height: 0;
  max-height: 100%;
  overflow: hidden;
  gap: 6px;
  padding: 10px 12px 12px;
}

.chatpapers-multi-root .chatpapers-header,
.chatpapers-multi-root .chatpapers-paper-chips,
.chatpapers-multi-root .chatpapers-cite-bar,
.chatpapers-multi-root .chatpapers-status,
.chatpapers-multi-root .chatpapers-toolbar,
.chatpapers-multi-root .chatpapers-composer {
  flex-shrink: 0;
}

.chatpapers-multi-root .chatpapers-messages {
  flex: 1 1 auto;
  min-height: 140px;
  max-height: none;
  height: auto;
}

.chatpapers-multi-root .chatpapers-empty-desc {
  max-width: 420px;
}

.chatpapers-multi-root .chatpapers-composer {
  margin-top: 2px;
  padding-top: 8px;
  border-top: 1px solid color-mix(in srgb, currentColor 12%, transparent);
}

.chatpapers-multi-root .chatpapers-composer .chatpapers-input {
  min-height: 80px;
}

.chatpapers-multi-root .chatpapers-toolbar {
  padding-top: 2px;
}

/* Dialog chrome: hide empty footer button area; thin scrollbars */
#dialog-button-box,
.dialog-button-box {
  display: none !important;
}

.chatpapers-table-wrap,
.chatpapers-multi-root {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, currentColor 35%, transparent) transparent;
}

.chatpapers-table-wrap::-webkit-scrollbar,
.chatpapers-multi-root::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.chatpapers-table-wrap::-webkit-scrollbar-thumb,
.chatpapers-multi-root::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, currentColor 32%, transparent);
  border-radius: 999px;
}

.chatpapers-paper-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 88px;
  overflow: auto;
  margin-bottom: 2px;
  scrollbar-width: thin;
  align-items: center;
}

.chatpapers-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  max-width: 260px;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, currentColor 18%, transparent);
  background: color-mix(in srgb, #2563eb 10%, transparent);
  color: inherit;
}

.chatpapers-chip-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 210px;
}

.chatpapers-chip-remove {
  appearance: none;
  border: none;
  background: transparent;
  color: inherit;
  padding: 0;
  margin: 0;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0.65;
  flex-shrink: 0;
}

.chatpapers-chip-remove:hover {
  opacity: 1;
  background: color-mix(in srgb, currentColor 12%, transparent);
}

.chatpapers-chip-add {
  cursor: pointer;
  background: transparent;
  border-style: dashed;
  max-width: none;
  font: inherit;
  color: inherit;
}

.chatpapers-chip-add:hover:not(:disabled) {
  background: color-mix(in srgb, #2563eb 12%, transparent);
}

.chatpapers-chip-add:disabled {
  opacity: 0.45;
  cursor: default;
}

.chatpapers-cite-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  padding: 2px 0 4px;
  position: relative;
  z-index: 5;
}

.chatpapers-cite-label {
  font-size: 12px;
  opacity: 0.8;
  flex-shrink: 0;
}

.chatpapers-cite-picker {
  position: relative;
  flex: 1 1 180px;
  min-width: 140px;
  max-width: 420px;
}

.chatpapers-cite-trigger {
  appearance: none;
  width: 100%;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  font: inherit;
  font-size: 12px;
  padding: 5px 8px;
  border-radius: 6px;
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
  background: color-mix(in srgb, currentColor 4%, transparent);
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.chatpapers-cite-trigger:hover:not(:disabled) {
  background: color-mix(in srgb, currentColor 10%, transparent);
}

.chatpapers-cite-trigger:disabled {
  opacity: 0.55;
  cursor: default;
}

.chatpapers-cite-trigger-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.chatpapers-cite-chevron {
  flex-shrink: 0;
  opacity: 0.7;
}

.chatpapers-cite-picker.is-open .chatpapers-cite-chevron {
  transform: rotate(180deg);
}

.chatpapers-cite-menu {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 4px);
  max-height: 220px;
  overflow: auto;
  z-index: 40;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
  background: Canvas;
  color: CanvasText;
  box-shadow: 0 8px 24px color-mix(in srgb, #000 18%, transparent);
  padding: 4px;
  scrollbar-width: thin;
}

.chatpapers-cite-option {
  appearance: none;
  display: block;
  width: 100%;
  box-sizing: border-box;
  border: none;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 12px;
  text-align: left;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chatpapers-cite-option:hover {
  background: color-mix(in srgb, #2563eb 14%, transparent);
}

.chatpapers-cite-option.is-active {
  background: color-mix(in srgb, #2563eb 22%, transparent);
  font-weight: 600;
}

.chatpapers-cite-btn {
  flex-shrink: 0;
}

/* --- Voice lecture pane --- */
.chatpapers-lecture-root {
  gap: 10px;
  max-width: 100%;
  min-width: 0;
}

.chatpapers-lecture-beat-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  min-height: 150px;
  max-height: min(260px, 34vh);
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y,
.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y {
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, currentColor 32%, transparent) transparent;
}

.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y {
  scrollbar-gutter: stable;
}

/* 段落列表：单行省略；详情区：换行（二者作用域分离） */
.chatpapers-lecture-beat-list .chatpapers-lecture-beat-line {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 auto;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
}

.chatpapers-lecture-beat-list .chatpapers-lecture-beat-label {
  flex: 0 0 auto;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.3;
  opacity: 0.72;
  white-space: nowrap;
}

.chatpapers-lecture-beat-list .chatpapers-lecture-beat-preview {
  flex: 1 1 0;
  width: 0;
  min-width: 0;
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y::-webkit-scrollbar,
.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y::-webkit-scrollbar-thumb,
.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, currentColor 28%, transparent);
  border-radius: 999px;
}

.chatpapers-lecture-beat-list.chatpapers-lecture-scroll-y::-webkit-scrollbar-track,
.chatpapers-lecture-para-detail.chatpapers-lecture-scroll-y::-webkit-scrollbar-track {
  background: transparent;
}

.chatpapers-lecture-empty {
  padding: 20px 12px;
}

.chatpapers-lecture-status {
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
  line-height: 1.45;
  background: color-mix(in srgb, #1f7a8c 10%, transparent);
  border: 1px solid color-mix(in srgb, #1f7a8c 22%, transparent);
}

.chatpapers-lecture-status[data-status="failed"] {
  background: color-mix(in srgb, #dc2626 10%, transparent);
  border-color: color-mix(in srgb, #dc2626 25%, transparent);
}

.chatpapers-lecture-status[data-status="ready"] {
  background: color-mix(in srgb, #16a34a 10%, transparent);
  border-color: color-mix(in srgb, #16a34a 25%, transparent);
}

.chatpapers-lecture-actions {
  display: flex;
  gap: 8px;
}

.chatpapers-lecture-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: none;
  border-radius: 8px;
  background: #1f7a8c;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.chatpapers-lecture-primary:hover:not(:disabled) {
  background: #186678;
}

.chatpapers-lecture-status-text {
  white-space: pre-line;
}

.chatpapers-lecture-primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.chatpapers-lecture-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid color-mix(in srgb, #1f7a8c 35%, transparent);
  border-radius: 8px;
  background: transparent;
  color: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.chatpapers-lecture-secondary:hover:not(:disabled) {
  background: color-mix(in srgb, #1f7a8c 10%, transparent);
}

.chatpapers-lecture-secondary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.chatpapers-lecture-tts-meta {
  font-size: 12px;
  opacity: 0.75;
}

.chatpapers-lecture-audio {
  width: 100%;
  margin-top: 4px;
}

.chatpapers-lecture-btn-icon {
  flex-shrink: 0;
}

.chatpapers-lecture-hint {
  font-size: 11px;
  opacity: 0.65;
  line-height: 1.4;
}

.chatpapers-lecture-mode-tabs {
  display: flex;
  gap: 0;
  padding: 3px;
  border-radius: 10px;
  background: #e8eef0;
  border: 1px solid #c5d3d8;
}

.chatpapers-lecture-mode-tab {
  flex: 1;
  -moz-appearance: none;
  appearance: none;
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  color: #4a5568;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.chatpapers-lecture-mode-tab:hover:not(.is-active) {
  background: rgba(255, 255, 255, 0.55);
  color: #2d3748;
}

.chatpapers-lecture-mode-tab.is-active,
.chatpapers-lecture-mode-tab[aria-selected="true"] {
  color: #ffffff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
}

.chatpapers-lecture-mode-tabs.mode-paragraph
  .chatpapers-lecture-mode-tab[data-mode="paragraph"].is-active,
.chatpapers-lecture-mode-tabs.mode-paragraph
  .chatpapers-lecture-mode-tab[data-mode="paragraph"][aria-selected="true"] {
  background: #1f7a8c;
}

.chatpapers-lecture-mode-tabs.mode-overview
  .chatpapers-lecture-mode-tab[data-mode="overview"].is-active,
.chatpapers-lecture-mode-tabs.mode-overview
  .chatpapers-lecture-mode-tab[data-mode="overview"][aria-selected="true"] {
  background: #2563eb;
}

.chatpapers-lecture-granularity-tabs {
  display: none;
  gap: 0;
  padding: 2px;
  margin-top: 2px;
  border-radius: 8px;
  background: #f3f6f8;
  border: 1px solid #d8e2e8;
}

.chatpapers-lecture-granularity-tabs.is-visible {
  display: flex;
}

.chatpapers-lecture-granularity-tab {
  flex: 1;
  -moz-appearance: none;
  appearance: none;
  padding: 6px 8px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  color: #64748b;
  transition: background 0.15s ease, color 0.15s ease;
}

.chatpapers-lecture-granularity-tab:hover:not(.is-active) {
  background: rgba(255, 255, 255, 0.7);
  color: #334155;
}

.chatpapers-lecture-granularity-tab.is-active,
.chatpapers-lecture-granularity-tab[aria-selected="true"] {
  background: #ffffff;
  color: #1f7a8c;
  box-shadow: 0 1px 3px rgba(31, 122, 140, 0.2);
  outline: 1px solid rgba(31, 122, 140, 0.35);
}

.chatpapers-lecture-sentence-item .chatpapers-lecture-beat-preview {
  font-size: 11px;
}

.chatpapers-lecture-beat-list .chatpapers-lecture-sentence-item {
  max-height: 42px;
}

.chatpapers-lecture-beat-list .chatpapers-lecture-sentence-item .chatpapers-lecture-beat-main {
  max-height: 40px;
}

.chatpapers-lecture-para-detail .chatpapers-lecture-para-original.is-active-sentence {
  display: block;
  margin-top: 2px;
  margin-bottom: 8px;
  border-left: 3px solid #1f7a8c;
  padding: 6px 8px;
  background: color-mix(in srgb, #1f7a8c 8%, transparent);
}

.chatpapers-lecture-para-detail .chatpapers-lecture-sentence-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
}

.chatpapers-lecture-para-detail .chatpapers-lecture-sentence-chip {
  display: block;
  appearance: none;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid color-mix(in srgb, #1f7a8c 20%, transparent);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 11px;
  line-height: 1.35;
  color: inherit;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: break-word;
}

.chatpapers-lecture-para-detail .chatpapers-lecture-sentence-chip.is-active {
  background: color-mix(in srgb, #1f7a8c 12%, transparent);
  border-color: color-mix(in srgb, #1f7a8c 40%, transparent);
}

.chatpapers-lecture-selection-explain .chatpapers-lecture-para-original.is-active-sentence {
  display: block;
  margin-bottom: 6px;
  border-left: 3px solid #1f7a8c;
  padding: 6px 8px;
  background: color-mix(in srgb, #1f7a8c 8%, transparent);
}

.chatpapers-lecture-pdf-sync-hint {
  margin-top: 4px;
  font-size: 10px;
  opacity: 0.72;
  font-style: italic;
}

.chatpapers-lecture-para-detail {
  display: block;
  padding: 10px;
  border-radius: 8px;
  background: color-mix(in srgb, #1f7a8c 5%, transparent);
  border: 1px solid color-mix(in srgb, #1f7a8c 15%, transparent);
  font-size: 12px;
  line-height: 1.45;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.chatpapers-lecture-para-detail:not(.is-empty) {
  min-height: 140px;
  max-height: min(300px, 38vh);
}

.chatpapers-lecture-para-detail.is-empty {
  min-height: auto;
  max-height: none;
  overflow: visible;
}

.chatpapers-lecture-para-detail .chatpapers-lecture-para-original,
.chatpapers-lecture-para-detail .chatpapers-lecture-para-translation,
.chatpapers-lecture-para-detail .chatpapers-lecture-para-context,
.chatpapers-lecture-para-detail .chatpapers-lecture-para-role,
.chatpapers-lecture-para-detail .chatpapers-lecture-para-kind,
.chatpapers-lecture-para-detail .chatpapers-lecture-pdf-sync-hint {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: break-word;
  max-width: 100%;
  font-size: 12px;
  line-height: 1.55;
}

.chatpapers-lecture-beat-detail .chatpapers-lecture-beat-script {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: break-word;
  max-width: 100%;
  font-size: 12px;
  line-height: 1.55;
  font-weight: 500;
}

.chatpapers-lecture-para-detail .chatpapers-lecture-para-original-label,
.chatpapers-lecture-para-detail .chatpapers-lecture-para-translation-label,
.chatpapers-lecture-para-detail .chatpapers-lecture-para-context-label {
  display: block;
  white-space: normal;
}

.chatpapers-lecture-para-detail-empty {
  opacity: 0.72;
  font-size: 12px;
  line-height: 1.45;
  text-align: center;
  padding: 8px 4px;
}

.chatpapers-lecture-para-play-btn {
  display: inline-flex;
  margin-bottom: 6px;
}

.chatpapers-lecture-beat-detail-meta {
  font-size: 11px;
  font-weight: 600;
  opacity: 0.78;
  line-height: 1.35;
}

.chatpapers-lecture-selection-explain {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  border-radius: 8px;
  background: color-mix(in srgb, #2563eb 6%, transparent);
  border: 1px solid color-mix(in srgb, #2563eb 18%, transparent);
  font-size: 12px;
  line-height: 1.45;
  max-height: 220px;
  overflow-y: auto;
}

.chatpapers-lecture-selection-title {
  font-size: 12px;
  font-weight: 700;
  color: #1d4ed8;
}

.chatpapers-lecture-selection-replay {
  align-self: flex-start;
  margin-top: 4px;
}

.chatpapers-selection-explain-btn {
  white-space: nowrap;
}

.chatpapers-lecture-para-kind {
  font-size: 11px;
  font-weight: 600;
  opacity: 0.75;
}

.chatpapers-lecture-para-role {
  font-size: 11px;
  opacity: 0.85;
  font-style: italic;
}

.chatpapers-lecture-para-original-label,
.chatpapers-lecture-para-translation-label,
.chatpapers-lecture-para-context-label {
  display: block;
  font-size: 10px;
  font-weight: 600;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 8px;
  margin-bottom: 2px;
}

.chatpapers-lecture-para-original {
  display: block;
  opacity: 0.9;
  margin-bottom: 4px;
}

.chatpapers-lecture-para-translation {
  display: block;
  font-weight: 500;
  margin-bottom: 4px;
}

.chatpapers-lecture-para-context {
  opacity: 0.85;
}

.chatpapers-lecture-player {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.chatpapers-lecture-player-title {
  font-size: 12px;
  font-weight: 600;
  opacity: 0.85;
}

.chatpapers-lecture-para-list-hint {
  font-size: 11px;
  opacity: 0.68;
  line-height: 1.35;
}

.chatpapers-lecture-beat-item {
  display: flex;
  align-items: stretch;
  gap: 4px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-height: 40px;
  box-sizing: border-box;
  border: 1px solid color-mix(in srgb, #1f7a8c 18%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, #1f7a8c 4%, transparent);
  overflow: hidden;
}

.chatpapers-lecture-beat-main {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  border: none;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font: inherit;
  font-size: 12px;
  color: inherit;
  box-sizing: border-box;
  overflow: hidden;
}

.chatpapers-lecture-beat-main:hover:not(:disabled) {
  background: color-mix(in srgb, #1f7a8c 10%, transparent);
}

.chatpapers-lecture-beat-main:disabled {
  opacity: 0.55;
  cursor: default;
}

.chatpapers-lecture-beat-play {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  align-self: stretch;
  border: none;
  border-left: 1px solid color-mix(in srgb, #1f7a8c 18%, transparent);
  background: color-mix(in srgb, #1f7a8c 6%, transparent);
  cursor: pointer;
  color: inherit;
}

.chatpapers-lecture-beat-play:hover:not(:disabled) {
  background: color-mix(in srgb, #1f7a8c 16%, transparent);
}

.chatpapers-lecture-beat-play:disabled {
  opacity: 0.45;
  cursor: default;
}

.chatpapers-lecture-beat-item.is-selected {
  border-color: color-mix(in srgb, #2563eb 45%, transparent);
  background: color-mix(in srgb, #2563eb 8%, transparent);
}

.chatpapers-lecture-beat-item.is-active {
  border-color: color-mix(in srgb, #16a34a 45%, transparent);
  background: color-mix(in srgb, #16a34a 10%, transparent);
}

.chatpapers-lecture-beat-item.is-selected.is-active {
  border-color: color-mix(in srgb, #16a34a 50%, transparent);
  box-shadow: inset 3px 0 0 color-mix(in srgb, #2563eb 70%, transparent);
}

.chatpapers-lecture-beat-item.is-pending {
  opacity: 0.55;
}

/* beat-line / beat-preview 规则见上方 .chatpapers-lecture-beat-list 作用域 */

.chatpapers-lecture-beat-status {
  flex-shrink: 0;
  align-self: center;
  font-size: 11px;
  line-height: 1;
  opacity: 0.7;
  max-width: 4.5em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chatpapers-lecture-player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.chatpapers-lecture-player-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid color-mix(in srgb, #1f7a8c 30%, transparent);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  color: inherit;
}

.chatpapers-lecture-player-btn:hover {
  background: color-mix(in srgb, #1f7a8c 12%, transparent);
}

.chatpapers-lecture-error {
  padding: 12px;
  color: #dc2626;
  font-size: 12px;
}