:root {
  --color-danger: #de002d;
  --color-blue: #0072cf;
  --color-bg-green: #e0f2e0;
  --color-grammar: seagreen;
  --color-alt-green: seagreen;
  --grey-6: #666;
  --grey-7: #333;
  --border: rgb(0 114 207 / 22%);
  --border-strong: rgb(0 114 207 / 42%);
  --page-bg: linear-gradient(180deg, rgb(224 242 224 / 38%) 0, rgb(255 255 255 / 92%) 260px, #fff 100%);
  --highlight-green: rgb(46 139 87 / 22%);
  --highlight-red: rgb(222 0 45 / 18%);
  --font-family-sans-serif: Optima, Helvetica, Arial, sans-serif;
  --font-family-serif: Bookerly, Georgia, "Times New Roman", serif;
  --font-family-ui: "Open Sans", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--grey-7);
  background: var(--page-bg);
  background-attachment: fixed;
  font-family: var(--font-family-ui);
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.gallery-view {
  min-height: 100vh;
  padding: 42px clamp(18px, 6vw, 84px) 56px;
}

.gallery-header {
  display: grid;
  grid-template-columns: 126px minmax(0, 1fr) 126px;
  align-items: center;
  gap: 16px;
  width: min(1080px, 100%);
  margin: 0 auto 24px;
}

.gallery-header-side,
.gallery-header-actions {
  display: flex;
  align-items: center;
}

.gallery-header-actions {
  justify-content: flex-end;
  gap: 6px;
}

.gallery-title-block {
  min-width: 0;
  text-align: center;
}

.dictionary-card-kicker {
  color: var(--color-blue);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: uppercase;
}

.gallery-header h1 {
  margin: 0;
  font-family: var(--font-family-sans-serif);
  font-size: clamp(32px, 5vw, 50px);
  font-weight: 500;
  line-height: 1.05;
}

.gallery-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  width: min(1080px, 100%);
  margin: 0 auto 22px;
}

.gallery-search {
  flex: 1;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  outline: none;
}

.dictionary-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  width: min(1080px, 100%);
  margin: 0 auto;
}

.dictionary-card {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 20px;
  min-height: 180px;
  padding: 24px;
  border: 1px solid rgb(0 114 207 / 16%);
  border-radius: 8px;
  background: rgb(255 255 255 / 92%);
  box-shadow: 0 14px 34px rgb(0 0 0 / 6%);
}

.dictionary-card h2 {
  margin: 10px 0 18px;
  font-family: var(--font-family-sans-serif);
  font-size: 28px;
  font-weight: 500;
  line-height: 1.15;
}

.dictionary-card-stat {
  color: var(--grey-7);
  font-size: 16px;
}

.dictionary-card-progress {
  margin-top: 8px;
  color: var(--color-alt-green);
  font-size: 14px;
}

.dictionary-card-actions {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  flex-direction: column;
  gap: 10px;
  min-width: 112px;
}

.app-shell {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  min-height: 100vh;
}

.app-shell.nav-collapsed {
  grid-template-columns: 0 minmax(0, 1fr);
}

.topic-rail {
  position: sticky;
  top: 0;
  width: 236px;
  height: 100vh;
  overflow: hidden;
  border-right: 1px solid var(--border);
  background: rgb(255 255 255 / 84%);
  opacity: 1;
  transition: width 160ms ease, opacity 160ms ease, border-color 160ms ease;
}

.topic-rail.collapsed {
  width: 0;
  border-right-color: transparent;
  opacity: 0;
  pointer-events: none;
}

.topic-rail.collapsed .rail-title,
.topic-rail.collapsed .topic-search,
.topic-rail.collapsed .topic-name,
.topic-rail.collapsed .topic-count {
  display: none;
}

.nav-peek {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  width: 48px;
  height: 100vh;
  border: 0;
  border-radius: 0;
  color: var(--grey-6);
  background: transparent;
  font-size: 0;
  opacity: 0;
  transition: opacity 140ms ease;
}

.nav-peek::before {
  content: "☰";
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgb(0 114 207 / 20%);
  border-radius: 999px;
  color: var(--grey-6);
  background: rgb(255 255 255 / 58%);
  box-shadow: 0 2px 10px rgb(0 0 0 / 6%);
  backdrop-filter: blur(8px);
  font-size: 16px;
}

.nav-peek:hover,
.nav-peek:focus-visible {
  opacity: 1;
}

.nav-peek:hover::before,
.nav-peek:focus-visible::before {
  color: var(--color-blue);
  background: white;
}

.app-shell.nav-collapsed .nav-peek {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mobile-topic-handle {
  display: none;
}

.mobile-topic-control {
  display: none;
}

.rail-head {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 58px;
  padding: 0 12px;
  border-bottom: 1px solid var(--border);
}

.rail-title {
  color: var(--grey-6);
  font-family: var(--font-family-sans-serif);
  font-size: 13px;
  letter-spacing: 0;
  text-transform: uppercase;
}

.topic-search {
  width: calc(100% - 24px);
  margin: 12px;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
}

.topic-search:focus,
textarea:focus,
input:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgb(0 114 207 / 12%);
}

.topic-list {
  height: calc(100vh - 116px);
  overflow: auto;
  padding: 4px 8px 18px;
}

.topic-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 0;
  border-radius: 8px;
  color: var(--grey-7);
  background: transparent;
  text-align: left;
}

.topic-item:hover {
  background: rgb(0 114 207 / 8%);
}

.topic-item.active {
  color: white;
  background: var(--color-blue);
}

.topic-item.review-entry {
  margin-bottom: 8px;
  border: 1px solid rgb(46 139 87 / 18%);
  color: var(--color-alt-green);
  background: rgb(46 139 87 / 7%);
}

.topic-item.review-entry.active {
  color: white;
  background: var(--color-alt-green);
}

.topic-name {
  overflow: hidden;
  font-family: var(--font-family-sans-serif);
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topic-count {
  color: inherit;
  font-size: 11px;
  opacity: 0.72;
}

.study-main {
  min-width: 0;
  padding: 28px clamp(18px, 5vw, 72px) 42px;
}

.topbar-reveal {
  display: none;
  align-items: flex-start;
  justify-content: center;
  min-height: 34px;
  margin: -18px 0 14px;
}

.topbar-collapsed .topbar {
  display: none;
}

.topbar-collapsed .topbar-reveal {
  display: flex;
  opacity: 0;
  transition: opacity 140ms ease;
}

.topbar-collapsed .topbar-reveal:hover,
.topbar-collapsed .topbar-reveal:focus-within {
  opacity: 1;
}

.topbar-arrow-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-height: 36px;
  padding: 0;
  border: 1px solid rgb(0 114 207 / 18%);
  border-radius: 999px;
  color: var(--color-blue);
  background: rgb(255 255 255 / 72%);
  box-shadow: 0 3px 12px rgb(0 0 0 / 5%);
}

.topbar-arrow-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.topbar-info {
  min-width: 0;
}

.app-title {
  font-family: var(--font-family-sans-serif);
  font-size: 22px;
  color: var(--grey-7);
}

.dictionary-title-button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  max-width: min(70vw, 520px);
  min-height: 34px;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
}

.dictionary-title-button span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dictionary-title-button svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--color-blue);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.dictionary-title-button:hover span {
  color: var(--color-blue);
}

.progress-line {
  margin-top: 6px;
  color: var(--grey-6);
  font-size: 13px;
  line-height: 1.5;
}

.top-actions,
.input-actions,
.record-actions,
.nav-actions,
.dialog-actions,
.ai-actions,
.compare-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.study-panel {
  width: min(100%, 920px);
  margin: 0 auto;
}

.loader,
.review-panel,
.complete-panel {
  width: min(100%, 760px);
  margin: 12vh auto 0;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}

.loader-title,
.review-panel h2,
.complete-panel h2 {
  margin: 0 0 8px;
  font-family: var(--font-family-sans-serif);
  font-size: 22px;
}

.loader-text,
.review-panel p,
.complete-panel p {
  color: var(--grey-6);
}

.review-presets,
.review-start-row,
.date-range-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.review-presets {
  margin-top: 18px;
}

.date-range-row {
  margin-top: 16px;
}

.date-range-row label {
  display: grid;
  gap: 7px;
}

.date-range-row span {
  color: var(--grey-6);
  font-size: 12px;
}

.date-range-row input {
  min-height: 38px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}

.review-start-row {
  justify-content: space-between;
  margin-top: 18px;
}

.review-count {
  color: var(--grey-7);
  font-size: 15px;
}

.loader-hint {
  margin-top: 14px;
  color: var(--grey-6);
  font-size: 13px;
  line-height: 1.5;
}

.expression-text {
  display: inline;
  margin: 18px 0 10px;
  font-family: var(--font-family-serif);
  font-size: 46px;
  font-weight: 650;
  line-height: 1.13;
  letter-spacing: 0;
  color: #222;
  overflow-wrap: normal;
  word-break: normal;
  text-wrap: balance;
}

.expression-text::after {
  content: "";
  display: block;
  height: 0;
}

.meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 24px;
  margin: 12px 0 8px;
}

.context-strip {
  position: relative;
  display: block;
  width: 100%;
  height: 22px;
  margin: 6px 0 18px;
  padding: 0 12px;
  overflow: hidden;
  border: 0;
  border-radius: 999px;
  color: var(--grey-6);
  background: linear-gradient(90deg, rgb(46 139 87 / 22%) 0%, rgb(224 242 224 / 22%) 38%, rgb(255 255 255 / 0%) 75%);
  text-align: left;
}

.context-line {
  display: block;
  color: var(--grey-6);
  font-size: 13px;
  line-height: 22px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 120ms ease;
}

.context-strip.expanded .context-line {
  opacity: 1;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: var(--color-grammar);
  background: transparent;
  font-size: 13px;
}

.tag.label {
  color: var(--color-alt-green);
  background: transparent;
}

.tag-separator {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  color: var(--grey-6);
  font-size: 13px;
  line-height: 1;
}

.explanation-panel {
  margin: 8px 0 16px;
  border-left: 3px solid rgb(46 139 87 / 32%);
  background: rgb(46 139 87 / 6%);
}

.explanation-panel summary {
  padding: 10px 12px;
  color: var(--color-alt-green);
  cursor: pointer;
  font-size: 13px;
  list-style-position: inside;
}

.explanation-content {
  max-height: 260px;
  overflow: auto;
  padding: 0 14px 12px 14px;
  color: var(--grey-7);
  font-size: 15px;
  line-height: 1.75;
}

.explanation-content p {
  margin: 8px 0;
}

.prompt-block {
  padding: 10px 0 20px;
}

.compare-block,
.ai-block {
  padding: 12px 0;
}

.section-label,
.note-label {
  display: block;
  margin-bottom: 10px;
  color: var(--grey-6);
  font-family: var(--font-family-sans-serif);
  font-size: 12px;
  text-transform: uppercase;
}

.chinese-prompt {
  font-size: 25px;
  line-height: 1.55;
}

.chinese-prompt:empty {
  display: none;
}

textarea {
  width: 100%;
  resize: vertical;
  padding: 15px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--grey-7);
  background: white;
  line-height: 1.7;
  outline: none;
}

.translation-input-area textarea {
  min-height: 150px;
  font-family: var(--font-family-serif);
  font-size: 22px;
}

.input-actions {
  justify-content: space-between;
  margin-top: 14px;
}

.comparison {
  margin-top: 24px;
}

.compare-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.compare-header .section-label {
  margin-bottom: 0;
}

.compare-toolbar {
  position: static;
  z-index: auto;
  flex-wrap: nowrap;
  margin-bottom: 0;
  padding: 0;
  color: var(--grey-6);
  background: transparent;
  backdrop-filter: none;
  font-size: 13px;
}

.markable-text {
  min-height: 58px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  font-family: var(--font-family-serif);
  font-size: 23px;
  line-height: 1.75;
}

.markable-text.reference {
  background: rgb(224 242 224 / 42%);
}

.mark-green {
  background-color: var(--highlight-green);
}

.mark-red {
  background-color: var(--highlight-red);
}

.ai-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.ai-result {
  min-height: 72px;
  padding: 14px 16px;
  border-left: 4px solid var(--color-blue);
  color: var(--grey-7);
  background: rgb(0 114 207 / 7%);
  line-height: 1.7;
  white-space: pre-wrap;
}

.record-actions {
  justify-content: flex-end;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.history-panel {
  margin-top: 16px;
  border: 1px solid rgb(0 114 207 / 16%);
  border-radius: 8px;
  background: rgb(255 255 255 / 72%);
}

.history-panel summary {
  padding: 10px 12px;
  color: var(--grey-6);
  cursor: pointer;
  font-size: 13px;
}

.history-item {
  padding: 12px;
  border-top: 1px solid rgb(0 114 207 / 12%);
}

.history-meta {
  margin-bottom: 6px;
  color: var(--grey-6);
  font-size: 12px;
}

.history-text {
  font-family: var(--font-family-serif);
  line-height: 1.6;
}

.history-note {
  margin-top: 8px;
  color: var(--grey-6);
  font-size: 13px;
  line-height: 1.6;
}

.primary-button,
.secondary-button,
.text-button,
.icon-button,
.mark-button,
.icon-action-button {
  min-height: 38px;
  border-radius: 8px;
  white-space: nowrap;
}

.primary-button {
  padding: 0 16px;
  border: 1px solid var(--color-blue);
  color: white;
  background: var(--color-blue);
}

.primary-button:hover {
  background: #0065b8;
}

.secondary-button {
  padding: 0 14px;
  border: 1px solid var(--border-strong);
  color: var(--color-blue);
  background: white;
}

.danger-button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid rgb(222 0 45 / 38%);
  border-radius: 8px;
  color: var(--color-danger);
  background: white;
}

.danger-button:hover {
  background: rgb(222 0 45 / 7%);
}

.text-button {
  padding: 0 8px;
  border: 0;
  color: var(--color-blue);
  background: transparent;
}

.icon-button {
  width: 36px;
  border: 1px solid var(--border);
  color: var(--grey-7);
  background: white;
}

.icon-action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  padding: 0;
  border: 1px solid var(--border-strong);
  color: var(--color-blue);
  background: white;
}

.icon-action-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.gallery-soft-action {
  border-color: transparent;
  color: var(--grey-6);
  background: transparent;
  opacity: 0.42;
  transition: color 140ms ease, opacity 140ms ease, background 140ms ease;
}

.gallery-soft-action:hover,
.gallery-soft-action:focus-visible {
  color: var(--color-blue);
  background: rgb(255 255 255 / 72%);
  opacity: 0.92;
}

.primary-icon-action {
  border-color: var(--color-blue);
  color: white;
  background: var(--color-blue);
}

.subtle-icon-action {
  border-color: rgb(0 114 207 / 18%);
  color: var(--grey-6);
}

.mark-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  min-height: 28px;
  padding: 0;
  border: 1px solid rgb(0 114 207 / 18%);
  border-radius: 7px;
}

.mark-green-control {
  background: rgb(46 139 87 / 28%);
}

.mark-red-control {
  background: rgb(222 0 45 / 22%);
}

.mark-eraser-control {
  color: var(--grey-6);
  background: white;
}

.mark-eraser-control svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.settings-dialog,
.parts-dialog,
.help-dialog {
  width: min(720px, calc(100vw - 28px));
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
}

.settings-dialog::backdrop,
.parts-dialog::backdrop,
.help-dialog::backdrop {
  background: rgb(0 0 0 / 28%);
}

.settings-form {
  padding: 22px;
}

.parts-panel {
  padding: 22px;
  background: white;
}

.help-dialog {
  width: min(420px, calc(100vw - 28px));
}

.help-panel {
  padding: 22px;
  background: white;
}

.wechat-group-image {
  display: block;
  width: min(100%, 320px);
  height: auto;
  margin: 12px auto 0;
  border-radius: 8px;
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.dialog-head h2 {
  margin: 0;
  font-size: 22px;
}

.dialog-head p {
  margin: 6px 0 0;
  color: var(--grey-6);
  font-size: 13px;
}

.parts-list {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.part-row {
  display: grid;
  grid-template-columns: minmax(72px, 1fr) minmax(128px, 1.2fr) minmax(164px, 1.4fr);
  align-items: center;
  gap: 14px;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid rgb(0 114 207 / 14%);
  border-radius: 8px;
  color: var(--grey-6);
  background: white;
  text-align: left;
}

.part-row:hover {
  border-color: var(--border-strong);
  background: rgb(0 114 207 / 5%);
}

.part-name {
  color: var(--grey-7);
  font-size: 17px;
  font-weight: 600;
}

.settings-section {
  padding: 14px 0 18px;
  border-top: 1px solid rgb(0 114 207 / 16%);
}

.settings-section:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.settings-section h3 {
  margin: 0 0 12px;
  color: var(--grey-7);
  font-size: 15px;
  font-weight: 600;
}

.settings-section p {
  margin: 9px 0 0;
  color: var(--grey-6);
  font-size: 13px;
  line-height: 1.5;
}

.dictionary-setting-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

#dictionaryFileName {
  color: var(--grey-6);
  font-size: 13px;
}

.inline-setting {
  display: flex !important;
  align-items: center;
  gap: 8px;
  margin: 4px 0 0 !important;
  color: var(--grey-7);
  width: fit-content;
}

.settings-form .inline-setting input {
  width: auto;
  flex: 0 0 auto;
  padding: 0;
  box-shadow: none;
}

.settings-form .inline-setting span {
  display: inline;
  margin-bottom: 0;
  white-space: nowrap;
}

.settings-form label {
  display: block;
  margin: 14px 0;
}

.settings-form label span {
  display: block;
  margin-bottom: 7px;
  color: var(--grey-6);
  font-size: 13px;
}

.settings-form label .prompt-variable-hint {
  margin: 7px 0 0;
  color: var(--grey-6);
  font-size: 12px;
  line-height: 1.45;
}

.settings-form input,
.settings-form select,
.settings-form textarea {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
}

.settings-form label[hidden] {
  display: none;
}

.dialog-actions {
  justify-content: flex-end;
  margin-top: 16px;
}

.settings-status {
  min-height: 22px;
  margin-top: 12px;
  color: var(--grey-6);
  font-size: 13px;
}

.hidden {
  display: none !important;
}

@media (max-width: 760px) {
  .gallery-view {
    padding: 28px 14px 36px;
  }

  .gallery-tools,
  .dictionary-card {
    align-items: stretch;
    flex-direction: column;
  }

  .gallery-header {
    display: flex;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    position: relative;
  }

  .gallery-header > .gallery-header-side:first-child {
    position: absolute;
    left: 0;
  }

  .gallery-header-actions {
    position: absolute;
    right: 0;
  }

  .gallery-header h1 {
    font-size: 32px;
    white-space: nowrap;
  }

  .gallery-header-actions {
    gap: 4px;
  }

  .gallery-header .icon-action-button {
    width: 38px;
    min-height: 38px;
  }

  .gallery-header .icon-action-button svg {
    width: 18px;
    height: 18px;
  }

  @media (max-width: 360px) {
    .gallery-header h1 {
      font-size: 20px;
    }

    .gallery-header .icon-action-button {
      width: 30px;
      min-height: 30px;
    }

    .gallery-header .icon-action-button svg {
      width: 16px;
      height: 16px;
    }
  }

  .dictionary-gallery {
    grid-template-columns: 1fr;
  }

  .dictionary-card-actions {
    align-items: stretch;
    min-width: 0;
  }

  .part-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .app-shell,
  .app-shell.nav-collapsed {
    display: block;
  }

  .topic-rail {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 30;
    width: min(82vw, 288px);
    box-shadow: 18px 0 38px rgb(0 0 0 / 12%);
  }

  .topic-rail.collapsed {
    width: 0;
    box-shadow: none;
  }

  .topic-rail:not(.collapsed) .rail-title,
  .topic-rail:not(.collapsed) .topic-search,
  .topic-rail:not(.collapsed) .topic-name,
  .topic-rail:not(.collapsed) .topic-count {
    display: block;
  }

  .study-main {
    position: relative;
    width: 100%;
    max-width: 100vw;
    padding: 18px 14px 30px;
  }

  .topbar-collapsed .topbar-reveal {
    opacity: 0.42;
  }

  .topbar-collapsed .topbar-reveal:hover,
  .topbar-collapsed .topbar-reveal:focus-within {
    opacity: 0.92;
  }

  .topbar-arrow-button,
  .mobile-topic-handle {
    width: 36px;
    min-height: 26px;
    border-color: rgb(51 51 51 / 10%);
    color: rgb(51 51 51 / 52%);
    background: rgb(255 255 255 / 46%);
    box-shadow: none;
    backdrop-filter: blur(8px);
    transition: opacity 140ms ease, color 140ms ease, background 140ms ease, border-color 140ms ease;
  }

  .topbar-arrow-button {
    border-radius: 0 0 999px 999px;
    border-top: 0;
  }

  .topbar-arrow-button svg,
  .mobile-topic-handle svg {
    width: 17px;
    height: 17px;
    stroke-width: 1.75;
  }

  .app-shell.nav-collapsed .nav-peek {
    display: none;
  }

  .record-actions,
  .ai-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: row;
    gap: 12px;
    margin-bottom: 8px;
  }

  .topbar-info {
    flex: 1 1 auto;
  }

  .top-actions {
    width: auto;
  }

  .nav-actions {
    width: 100%;
  }

  .nav-actions button,
  .input-actions button {
    flex: 1;
  }

  .top-actions {
    flex: 0 0 auto;
    flex-wrap: nowrap;
  }

  .dictionary-title-button {
    max-width: calc(100vw - 168px);
  }

  .app-shell.nav-collapsed .study-main:has(:is(.study-panel, .review-panel):not(.hidden)) .mobile-topic-control {
    display: flex;
  }

  .mobile-topic-control {
    align-items: center;
    min-height: 34px;
    margin: 0 0 8px;
  }

  .topbar-collapsed .mobile-topic-control {
    position: absolute;
    left: 14px;
    top: 0;
    z-index: 21;
    margin: 0;
  }

  .expression-shell {
    display: block;
    max-width: 100%;
    min-width: 0;
    margin: 8px 0 10px;
  }

  .mobile-topic-handle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: -16px;
    padding: 0;
    border: 1px solid rgb(51 51 51 / 10%);
    border-radius: 0 999px 999px 0;
  }

  .mobile-topic-handle svg {
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .app-shell.nav-collapsed .study-main:has(:is(.study-panel, .review-panel):not(.hidden)) .mobile-topic-handle {
    opacity: 0.42;
    pointer-events: auto;
  }

  .topbar-arrow-button:hover,
  .topbar-arrow-button:focus-visible,
  .mobile-topic-handle:hover,
  .mobile-topic-handle:focus-visible {
    border-color: rgb(51 51 51 / 12%);
    color: rgb(51 51 51 / 52%);
    background: rgb(255 255 255 / 68%);
    opacity: 0.92;
  }

  .input-actions,
  .nav-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .input-actions .primary-button,
  .nav-actions .primary-button {
    order: -1;
  }

  .chinese-prompt,
  .markable-text {
    font-size: 20px;
  }

  .expression-text {
    display: block;
    max-width: 100%;
    margin: 0;
    font-size: 34px;
    line-height: 1.18;
    overflow-wrap: anywhere;
    word-break: normal;
    text-wrap: wrap;
  }
}