.status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #b9b6ad;
}

.dot.live {
  background: #41a57f;
  box-shadow: 0 0 0 5px rgba(65, 165, 127, .13);
}

.ghost-btn,
.icon-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 15px;
  background: rgba(255, 255, 255, .65);
  color: var(--ink);
}

.ghost-btn:hover,
.icon-btn:hover {
  background: #fff;
}

.ghost-btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.action-primary {
  border-color: transparent;
  background: var(--ink);
  color: #fff;
  font-weight: 900;
  box-shadow: 0 12px 26px rgba(23, 24, 21, .14);
}

.action-primary:hover {
  background: #2c2e2a;
}

.action-primary:disabled {
  background: rgba(23, 24, 21, .22);
  color: rgba(23, 24, 21, .55);
  box-shadow: none;
}

.action-secondary {
  background: rgba(255, 255, 255, .72);
  font-weight: 700;
}

.danger-link {
  justify-self: center;
  border: 0;
  border-radius: 8px;
  padding: 4px 8px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
}

.danger-link:hover {
  color: #9b4d2e;
  background: rgba(155, 77, 46, .08);
}

.danger-link:disabled {
  opacity: .42;
  cursor: not-allowed;
}

.eyebrow {
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 26px;
}

.pill {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .5);
  font-size: 12px;
}

.input-card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border-radius: var(--radius-xl);
  background: var(--ink);
  color: #fff;
  box-shadow: var(--shadow);
}

.input-card::before {
  content: "∫";
  position: absolute;
  right: -15px;
  top: -40px;
  color: rgba(255, 255, 255, .045);
  font: 180px Georgia, serif;
  transform: rotate(12deg);
}

.input-card h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.input-card .sub {
  color: rgba(255, 255, 255, .56);
  font-size: 12px;
  line-height: 1.6;
}

.mode-tabs {
  display: flex;
  margin: 22px 0 14px;
  padding: 4px;
  border-radius: 14px;
  background: rgba(255, 255, 255, .08);
}

.mode-tab {
  flex: 1;
  border: 0;
  border-radius: 11px;
  padding: 10px;
  background: transparent;
  color: rgba(255, 255, 255, .58);
  font-size: 12px;
}

.mode-tab.active {
  background: #fff;
  color: var(--ink);
  font-weight: 800;
}

.formula-input {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, .075);
  color: #fff;
  line-height: 1.65;
  outline: none;
}

.formula-input:focus {
  border-color: rgba(255, 255, 255, .42);
}

.formula-input::placeholder {
  color: rgba(255, 255, 255, .32);
}

.formula-preview {
  display: none;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 30px;
  margin-top: 12px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, .06);
  color: #fff;
  font-size: 20px;
}

.formula-preview.show {
  display: block;
}

.latex-rendered {
  max-width: 100%;
}

.latex-display {
  overflow-x: auto;
  overflow-y: hidden;
}

.latex-rendered .katex-display {
  margin: 0;
}

.latex-display > .katex-display {
  min-width: max-content;
}

.inline-latex {
  display: inline-block;
  max-width: 100%;
  vertical-align: -0.12em;
}

.inline-latex .katex {
  font-size: 1em;
}

.upload-zone {
  position: relative;
  min-height: 140px;
  display: grid;
  place-items: center;
  border: 1px dashed rgba(255, 255, 255, .25);
  border-radius: 18px;
  padding: 18px;
  color: rgba(255, 255, 255, .6);
  text-align: center;
}

.upload-zone.drag-over {
  border-color: rgba(255, 255, 255, .62);
  background: rgba(255, 255, 255, .08);
}

.upload-zone input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.upload-zone b {
  display: block;
  margin-bottom: 6px;
  color: #fff;
}

.preview {
  max-width: 100%;
  max-height: 128px;
  border-radius: 10px;
}

.upload-note {
  margin-top: 8px;
  color: rgba(255, 255, 255, .72);
  font-size: 12px;
}

.explain-heading {
  margin: 22px 0 8px;
  color: var(--green);
  font-size: 15px;
  font-weight: 900;
}

.explain-heading:first-child {
  margin-top: 0;
}

.example-row {
  display: flex;
  gap: 8px;
  overflow: auto;
  padding: 12px 0 4px;
}

.example {
  white-space: nowrap;
  border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 999px;
  padding: 8px 10px;
  background: transparent;
  color: rgba(255, 255, 255, .72);
  font-size: 11px;
}

.example:hover {
  border-color: rgba(255, 255, 255, .4);
  color: #fff;
}

.primary {
  width: 100%;
  border: 0;
  border-radius: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 15px 18px;
  background: var(--yellow);
  color: var(--ink);
  font-weight: 900;
}

.primary:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 30px;
}

.feature {
  border-top: 1px solid var(--line);
  padding: 18px 2px;
}

.feature .no {
  color: var(--orange);
  font: italic 28px Georgia, serif;
}

.feature h3 {
  margin: 13px 0 8px;
  font-size: 15px;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.75;
}

.learning-pulse,
.today-review,
.learning-library,
.learning-data-tools,
.cloud-account-tools {
  margin-top: 64px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.learning-pulse {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
}

.learning-pulse-copy h2 {
  margin: 8px 0 0;
  font-size: 22px;
}

.learning-pulse-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(112px, 1fr));
  gap: 28px;
  min-width: 270px;
  margin: 0;
}

.learning-pulse-metrics div {
  display: grid;
  gap: 5px;
  border-left: 1px solid var(--line);
  padding-left: 16px;
}

.learning-pulse-metrics dt {
  color: var(--muted);
  font-size: 10px;
}

.learning-pulse-metrics dd {
  margin: 0;
  color: var(--ink);
  font-size: 17px;
  font-weight: 800;
}

.today-review-head,
.learning-library-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 10px;
}

.today-review-head h2,
.learning-library-head h2 {
  margin: 8px 0 0;
  font-size: 26px;
}

.today-review-count {
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 11px;
  text-align: right;
}

.today-review-count b {
  color: var(--ink);
  font-size: 12px;
}

.today-review-list {
  border-top: 1px solid var(--line);
}

.today-review-row {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(160px, .9fr) minmax(150px, 1fr) auto 96px;
  align-items: center;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding: 15px 4px;
}

.today-review-context {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.today-review-context b,
.today-review-session {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.today-review-context b {
  color: var(--ink);
  font-size: 14px;
}

.today-review-session {
  color: var(--muted);
  font-size: 10px;
}

.today-review-formula {
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  color: var(--ink);
  font-size: 13px;
  scrollbar-width: thin;
}

.today-review-formula .katex {
  font-size: 1em;
}

.today-review-reason {
  color: var(--green);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.today-review-reason.urgent {
  color: #9b4d2e;
}

.today-review-open {
  width: 96px;
  min-height: 38px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: transparent;
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
}

.today-review-open:hover {
  background: var(--ink);
  color: #fff;
}

.today-review-complete {
  display: flex;
  align-items: center;
  gap: 13px;
  border-left: 3px solid var(--green);
  padding: 12px 14px;
  background: rgba(31, 122, 90, .06);
}

.today-review-complete > span:last-child {
  display: grid;
  gap: 3px;
}

.today-review-complete b {
  color: var(--green);
  font-size: 13px;
}

.today-review-complete small {
  color: var(--muted);
  font-size: 11px;
}

.today-review-check {
  color: var(--green);
  font-size: 20px;
  font-weight: 900;
}

.learning-library-count {
  color: var(--muted);
  font-size: 12px;
}

.learning-data-tools,
.cloud-account-tools {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 8px;
}

.learning-data-tools h2,
.cloud-account-tools h2 {
  margin: 8px 0 0;
  font-size: 22px;
}

.learning-data-actions,
.cloud-account-actions {
  display: flex;
  gap: 10px;
}

.cloud-account-actions {
  display: grid;
  width: min(100%, 280px);
  grid-template-columns: repeat(2, minmax(120px, 1fr));
}

.cloud-account-status {
  min-height: 20px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.learning-data-action {
  min-width: 96px;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 14px;
  background: transparent;
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.learning-data-action:hover:not(:disabled) {
  border-color: var(--ink);
}

.learning-data-action.primary-action {
  border-color: var(--ink);
}

.learning-data-action.primary-action:hover {
  background: var(--ink);
  color: #fff;
}

.learning-data-action.danger-action {
  border-color: rgba(155, 77, 46, .38);
  color: #8d3f24;
}

.learning-data-action.danger-action:hover:not(:disabled) {
  border-color: #8d3f24;
  background: rgba(155, 77, 46, .08);
}

.learning-data-action:disabled {
  cursor: not-allowed;
  opacity: .38;
}

.run-log-panel {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.run-log-head,
.run-log-meta,
.run-log-main,
.run-log-head-actions {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.run-log-head h2 { margin: 8px 0 0; font-size: 22px; }
.run-log-head p { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.run-log-head-actions { align-items: center; }
.run-log-count { color: var(--muted); font-size: 12px; white-space: nowrap; }
.run-log-list { margin-top: 16px; border-top: 1px solid var(--line); }
.run-log-row { padding: 14px 0; border-bottom: 1px solid var(--line); }
.run-log-main { justify-content: flex-start; }
.run-log-main b { min-width: 86px; color: var(--ink); }
.run-log-main span,
.run-log-meta time,
.run-log-row small { color: var(--muted); font-size: 12px; }
.run-log-meta { align-items: center; }
.run-log-source { border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; font-size: 10px; font-weight: 800; }
.run-log-source.hunyuan { color: #b3261e; border-color: rgba(213, 43, 30, .34); background: #fff5f3; }
.run-log-source.offline { color: #6f6b64; background: #f1efea; }
.run-log-row small { display: block; margin-top: 7px; }
.run-log-calls { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.run-log-calls code { padding: 4px 6px; border-radius: 4px; background: rgba(31, 122, 90, .08); color: var(--green); font-size: 10px; }

.learning-session-list {
  border-top: 1px solid var(--line);
}

.learning-session-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 68px;
  align-items: stretch;
  border-bottom: 1px solid var(--line);
  transition: background .18s ease;
}

.learning-session-row:hover,
.learning-session-row.active {
  background: rgba(255, 255, 255, .56);
}

.learning-session-open {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(150px, .7fr) minmax(180px, 1fr) auto;
  align-items: center;
  gap: 22px;
  border: 0;
  padding: 18px 16px 18px 4px;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.learning-session-title {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.learning-session-title b {
  overflow: hidden;
  font-size: 15px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.learning-session-title small {
  flex: 0 0 auto;
  color: var(--green);
  font-size: 10px;
  font-weight: 800;
}

.learning-session-formula {
  min-width: 0;
  min-height: 32px;
  display: flex;
  align-items: center;
  overflow-x: auto;
  overflow-y: hidden;
  color: var(--ink);
  font-size: 14px;
  scrollbar-width: thin;
}

.learning-session-formula .katex {
  font-size: 1em;
}

.learning-session-meta {
  min-width: 126px;
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 11px;
  text-align: right;
}

.learning-mastery-summary {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

.mastery-count,
.mastery-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.mastery-count::before,
.mastery-indicator::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: #a8a69f;
  content: '';
}

.mastery-count.needs-review,
.mastery-indicator.needs-review {
  color: #9b4d2e;
}

.mastery-count.needs-review::before,
.mastery-indicator.needs-review::before {
  background: #c96b42;
}

.mastery-count.mastered,
.mastery-indicator.mastered {
  color: var(--green);
}

.mastery-count.mastered::before,
.mastery-indicator.mastered::before {
  background: var(--green);
}

.learning-session-delete {
  align-self: center;
  justify-self: end;
  border: 0;
  border-radius: 7px;
  padding: 7px 8px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
}

.learning-session-delete:hover {
  background: rgba(155, 77, 46, .08);
  color: #9b4d2e;
}

.page-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 24px;
}

.page-head h1 {
  margin: 12px 0 0;
  font-size: clamp(34px, 5vw, 60px);
  line-height: 1.05;
  letter-spacing: 0;
}

.page-head p {
  max-width: 620px;
  color: var(--muted);
  line-height: 1.8;
}

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

.formula-stage {
  position: relative;
  overflow: hidden;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xl);
  padding: 36px;
  background: var(--ink);
  color: #fff;
}

.formula-stage::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 280px;
  height: 280px;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 50%;
}

.formula-stage .katex {
  font-size: clamp(24px, 4.2vw, 48px);
  white-space: nowrap;
}

.formula-stage .katex-display {
  min-width: max-content;
}

.formula-stage .raw-latex {
  position: relative;
  z-index: 1;
  width: 100%;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 14px 0;
  font-family: Georgia, serif;
  font-size: clamp(24px, 4vw, 42px);
  text-align: center;
  white-space: nowrap;
}

.formula-stage .raw-latex.large-formula,
.detail-glyph.large-formula {
  overflow: hidden;
  justify-content: center;
}

.formula-stage .raw-latex.large-formula > .katex-display,
.detail-glyph.large-formula > .katex-display {
  width: auto;
  min-width: 0;
  max-width: 100%;
}

.large-formula .katex {
  transition: font-size .12s ease;
}

.formula-label {
  position: absolute;
  top: 22px;
  left: 24px;
  color: rgba(255, 255, 255, .5);
  font-size: 11px;
  letter-spacing: .14em;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 14px 0;
}

.meta,
.explain-block,
.detail-main,
.side-card {
  border: 1px solid var(--line);
}

.meta {
  border-radius: 18px;
  padding: 16px;
  background: var(--white);
}

.meta span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: .12em;
}

.meta b {
  font-size: 14px;
}

.explain-block small {
  color: var(--green);
  font-weight: 900;
  letter-spacing: .12em;
}

.explain-block {
  margin: 14px 0;
  border-radius: 20px;
  padding: 20px;
  background: var(--white);
}

.explain-block small {
  display: block;
  margin-bottom: 10px;
  font-size: 10px;
}

.explain-block p {
  margin: 0 0 10px;
  color: #3a3b36;
  font-size: 14px;
  line-height: 1.9;
}

.explain-block p:last-child {
  margin-bottom: 0;
}

.explain-block .formula-line {
  display: block;
  overflow-x: auto;
  overflow-y: hidden;
  margin: 16px 0;
  padding: 10px 8px;
  color: var(--ink);
  text-align: center;
}

.explain-block .formula-line .katex-display {
  margin: 0;
}

.explain-block .formula-line .katex {
  font-size: 1.12em;
}

.latex-fallback {
  font-family: "Cambria Math", "Times New Roman", serif;
  letter-spacing: 0;
  white-space: normal;
}

.inline-latex.latex-fallback {
  display: inline-block;
  margin: 0 2px;
  padding: 0 4px;
  border-radius: 5px;
  background: rgba(31, 122, 90, .08);
  color: var(--ink);
  line-height: 1.45;
}

.formula-line.latex-fallback {
  white-space: normal;
  line-height: 1.6;
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin: 34px 0 14px;
}

.section-title h2 {
  margin: 0;
  font-size: 22px;
}

.section-title p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.arrow {
  flex: none;
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 50%;
  display: grid;
  place-items: center;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 11px;
}

.crumb {
  border: 0;
  padding: 0;
  background: transparent;
  color: inherit;
}

.crumb:hover {
  color: var(--ink);
}

.crumb-sep {
  opacity: .45;
}

.detail-main,
.side-card {
  border-radius: var(--radius-lg);
  background: var(--white);
}

.detail-main {
  padding: 28px;
}

.detail-glyph {
  width: 100%;
  min-width: 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  overflow-x: hidden;
  overflow-y: hidden;
}

.detail-glyph .katex {
  font-size: clamp(24px, 4.2vw, 44px);
  white-space: nowrap;
}

.detail-glyph .katex-display {
  min-width: max-content;
}

.detail-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin: 4px 0 24px;
}

.detail-title-row h1 {
  min-width: 0;
  margin: 0;
  font-size: 32px;
  letter-spacing: 0;
}

.detail-title-row .mastery-indicator {
  flex: 0 0 auto;
}

.side-card {
  padding: 20px;
}

.side-card h3 {
  margin: 0 0 12px;
  font-size: 14px;
}

.side-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.side-card-head h3 {
  margin: 0;
}

.side-card-head span {
  color: var(--muted);
  font-size: 11px;
}

.side-hint,
.side-stat,
.empty-note {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.8;
}

.side-stat b {
  color: var(--ink);
}

.side-full {
  width: 100%;
  margin-top: 12px;
}

.side-group {
  margin-top: 18px;
}

.side-group h4 {
  margin: 0 0 8px;
  color: var(--green);
  font-size: 11px;
  letter-spacing: .08em;
}

.side-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.side-item {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 11px 0;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.side-item:hover b {
  color: var(--green);
}

.side-item-main {
  min-width: 0;
}

.side-item-main b {
  display: block;
  font-size: 13px;
}

.side-item-main small {
  display: block;
  overflow: hidden;
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.55;
  text-overflow: ellipsis;
}

.side-item-aside {
  min-width: 74px;
  display: grid;
  justify-items: end;
  gap: 5px;
}

.mastery-indicator.compact {
  font-size: 10px;
}

.mastery-indicator.compact::before {
  width: 6px;
  height: 6px;
}

.side-glyph {
  max-width: 92px;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  text-overflow: ellipsis;
}

.base-stop {
  margin-top: 16px;
  border: 1px dashed rgba(31, 122, 90, .5);
  border-radius: 18px;
  padding: 18px;
  background: var(--green-2);
}

.base-stop b {
  color: var(--green);
}

.math-visualization-card {
  margin: 18px 0;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px;
  background: var(--white);
}

.math-visualization-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 14px;
}

.math-visualization-head small {
  color: var(--green);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .12em;
}

.math-visualization-head h2 {
  margin: 5px 0 0;
  font-size: 21px;
}

.math-visualization-head span {
  color: var(--muted);
  font-size: 11px;
}

.math-visualization-board {
  width: 100%;
  height: 380px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.math-visualization-probe {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  border: 1px solid rgba(31, 122, 90, .24);
  border-radius: 14px;
  padding: 13px 14px;
  background: linear-gradient(135deg, rgba(232, 242, 236, .78), rgba(255, 255, 255, .98));
}

.math-visualization-probe-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.math-visualization-probe-head small,
.math-visualization-probe-head b { display: block; }
.math-visualization-probe-head small { color: var(--green); font-size: 9px; font-weight: 900; letter-spacing: .12em; }
.math-visualization-probe-head b { margin-top: 3px; color: var(--ink); font-size: 13px; }
.math-visualization-probe-readout { color: var(--green); font-size: 12px; font-weight: 800; text-align: right; }
.math-visualization-probe-formula { min-height: 24px; overflow-x: auto; color: var(--ink); text-align: center; }
.math-visualization-probe input[type="range"] { width: 100%; accent-color: var(--green); cursor: ew-resize; }
.math-visualization-probe p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.5; }

.math-tool-panel {
  margin: 20px 0;
  border: 1px solid rgba(31, 122, 90, .24);
  border-radius: 20px;
  padding: 18px;
  background: linear-gradient(145deg, rgba(232, 242, 236, .78), rgba(255, 255, 255, .96));
}

.math-tool-panel-head,
.math-tool-result-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.math-tool-panel-head small,
.math-tool-result-head small {
  color: var(--green);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.math-tool-panel h2,
.math-tool-result h3 {
  margin: 5px 0 0;
}

.math-tool-panel h2 { font-size: 22px; }
.math-tool-result h3 { font-size: 19px; }

.execution-badge {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 9px;
  color: var(--muted);
  background: var(--white);
  font-size: 10px;
  font-weight: 800;
}

.execution-badge.harness { border-color: rgba(31, 122, 90, .34); color: var(--green); }
.execution-badge.hunyuan { border-color: rgba(213, 43, 30, .34); color: #b3261e; background: #fff5f3; }
.execution-badge.fallback { border-color: rgba(201, 107, 66, .42); color: #a44f2d; background: #fff6f0; }
.execution-badge.direct { color: #2f6fb3; }
.execution-badge.offline { color: #6f6b64; background: #f1efea; }

.math-tool-intro,
.math-tool-empty {
  margin: 12px 0;
  color: var(--muted);
  line-height: 1.65;
}

.math-tool-candidates {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.math-tool-choice {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 13px;
  text-align: left;
  background: var(--white);
  cursor: pointer;
  transition: border-color .18s ease, transform .18s ease;
}

.math-tool-choice:hover {
  border-color: var(--green);
  transform: translateY(-1px);
}

.math-tool-choice b,
.math-tool-choice span,
.math-tool-choice small { display: block; }
.math-tool-choice b { color: var(--ink); font-size: 14px; }
.math-tool-choice span { margin-top: 5px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.math-tool-choice small { margin-top: 7px; color: var(--green); }

.math-tool-input-label {
  display: block;
  margin: 14px 0 6px;
  color: var(--ink);
  font-size: 11px;
  font-weight: 800;
}

.math-tool-input {
  width: 100%;
  min-height: 68px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, .9);
  font: inherit;
  font-size: 12px;
}

.math-tool-results { display: grid; gap: 14px; margin-top: 16px; }

.math-tool-result {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  background: var(--white);
}

.math-tool-result p,
.math-tool-result li { color: var(--ink); line-height: 1.7; }
.math-tool-result ol { margin: 10px 0; padding-left: 22px; }
.math-tool-result-formula { margin: 14px 0; overflow-x: auto; padding: 12px; text-align: center; background: var(--paper); border-radius: 12px; }
.math-tool-content-heading { margin: 18px 0 6px; color: var(--ink); font-size: 15px; }
.math-tool-inline-formula { display: inline-block; margin: 0 .16em; vertical-align: middle; }
.math-tool-item-formula { display: block; margin-top: 5px; overflow-x: auto; }
.math-tool-result li > b { display: block; margin-bottom: 3px; }

.math-tool-notes { display: grid; gap: 4px; margin-top: 10px; border-left: 3px solid var(--green); padding: 8px 10px; background: var(--green-2); font-size: 12px; }
.math-tool-notes.warning { border-left-color: #c96b42; background: #fff6f0; }
.math-tool-notes span { color: var(--muted); }
.math-tool-notes .math-tool-inline-formula,
.math-tool-notes .math-tool-item-formula { color: var(--ink); }

.math-tool-calls { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin: 12px 0; color: var(--muted); font-size: 10px; }
.math-tool-calls code { border: 1px solid var(--line); border-radius: 999px; padding: 4px 7px; background: var(--paper); color: var(--ink); }

.quiz-section {
  margin-top: 30px;
  border-top: 1px solid var(--line);
  padding-top: 26px;
}

.quiz-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
}

.quiz-head h2 {
  margin: 7px 0 0;
  font-size: 23px;
  letter-spacing: 0;
}

.quiz-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.quiz-status::before {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: #a8a69f;
  content: '';
}

.quiz-status.needs-review {
  color: #9b4d2e;
}

.quiz-status.needs-review::before {
  background: #c96b42;
}

.quiz-status.mastered {
  color: var(--green);
}

.quiz-status.mastered::before {
  background: var(--green);
}

.quiz-intro {
  max-width: 560px;
  margin: 12px 0 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

.review-mode-note {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 15px;
  border-left: 3px solid var(--orange);
  padding: 9px 12px;
  background: rgba(201, 107, 66, .06);
}

.review-mode-note b {
  color: #9b4d2e;
  font-size: 12px;
}

.review-mode-note span {
  color: var(--muted);
  font-size: 11px;
}

.quiz-generate,
.quiz-submit {
  border: 0;
  border-radius: 6px;
  padding: 12px 18px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}

.quiz-generate:hover,
.quiz-submit:hover {
  background: var(--green);
}

.quiz-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 13px 0 18px;
  color: var(--muted);
  font-size: 11px;
}

.quiz-summary span {
  padding: 0 10px;
  border-right: 1px solid var(--line);
}

.quiz-summary span:first-child {
  padding-left: 0;
}

.quiz-summary span:last-child {
  border-right: 0;
}

.quiz-form {
  display: grid;
  gap: 14px;
}

.quiz-question {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px;
}

.quiz-question legend {
  width: 100%;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 9px;
  padding: 0 0 13px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.65;
}

.quiz-question legend span {
  color: var(--orange);
  font-family: Georgia, serif;
  font-size: 15px;
  font-style: italic;
}

.quiz-options {
  display: grid;
}

.quiz-option {
  min-width: 0;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: start;
  gap: 9px;
  border-top: 1px solid rgba(217, 214, 204, .72);
  padding: 11px 2px;
  color: #3a3b36;
  font-size: 13px;
  line-height: 1.65;
}

.quiz-option input {
  width: 15px;
  height: 15px;
  margin: 3px 0 0;
  accent-color: var(--green);
}

.quiz-option:has(input:checked) {
  color: var(--ink);
  font-weight: 700;
}

.quiz-short-answer {
  display: grid;
  gap: 7px;
}

.quiz-short-answer span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
}

.quiz-short-answer input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px 13px;
  background: #fff;
  color: var(--ink);
  font-size: 14px;
}

.quiz-short-answer input:focus {
  border-color: var(--green);
  outline: 3px solid rgba(31, 122, 90, .12);
}

.quiz-feedback {
  margin-top: 12px;
  border-left: 3px solid #c96b42;
  padding: 10px 12px;
  background: rgba(201, 107, 66, .06);
}

.quiz-feedback.correct {
  border-left-color: var(--green);
  background: rgba(31, 122, 90, .06);
}

.quiz-feedback b {
  color: #9b4d2e;
  font-size: 12px;
}

.quiz-feedback.correct b {
  color: var(--green);
}

.quiz-feedback p {
  margin: 4px 0 0;
  color: #4d4d47;
  font-size: 12px;
  line-height: 1.7;
}

.quiz-feedback small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 11px;
  overflow-wrap: anywhere;
}

.quiz-submit-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 15px;
}

.quiz-submit-row > span {
  color: var(--muted);
  font-size: 11px;
}

.review-completion {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-left: 3px solid #c96b42;
  padding: 14px 15px;
  background: rgba(201, 107, 66, .06);
}

.review-completion.correct {
  border-left-color: var(--green);
  background: rgba(31, 122, 90, .06);
}

.review-completion > span:nth-child(2) {
  display: grid;
  gap: 3px;
}

.review-completion b {
  color: #9b4d2e;
  font-size: 13px;
}

.review-completion.correct b,
.review-completion.correct .review-completion-mark {
  color: var(--green);
}

.review-completion small {
  color: var(--muted);
  font-size: 11px;
}

.review-completion-mark {
  color: #9b4d2e;
  font-size: 20px;
  font-weight: 900;
}

.review-completion button {
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}

.quiz-form.completed input {
  cursor: default;
}

.cloud-card {
  min-height: 620px;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  padding: 18px;
  background: var(--ink);
  color: #fff;
}

.cloud-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 6px 8px 16px;
}

.cloud-toolbar p {
  margin: 0;
  color: rgba(255, 255, 255, .55);
  font-size: 12px;
}

.cloud-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.cloud-tool {
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 999px;
  padding: 8px 11px;
  background: rgba(255, 255, 255, .06);
  color: rgba(255, 255, 255, .72);
  font-size: 11px;
}

.cloud-tool:hover,
.cloud-tool.active {
  background: #fff;
  color: var(--ink);
}

.cloud-stage {
  min-height: 540px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 16px;
}

.cloud-graph {
  min-width: 0;
  min-height: 540px;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: 22px;
  background: #171815;
}

.cloud-inspector {
  border: 1px solid rgba(255, 255, 255, .11);
  border-radius: 22px;
  padding: 18px;
  background: rgba(255, 255, 255, .055);
}

.cloud-inspector-kicker {
  color: rgba(255, 255, 255, .45);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.cloud-inspector h3 {
  margin: 10px 0 6px;
  font-size: 17px;
  line-height: 1.35;
}

.cloud-inspector-meta {
  margin: 0 0 14px;
  color: rgba(255, 255, 255, .56);
  font-size: 12px;
}

.cloud-inspector-formula {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  border-top: 1px solid rgba(255, 255, 255, .1);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  padding: 14px 0;
  color: #fff;
  font-size: 15px;
}

.cloud-inspector-formula .katex {
  font-size: 1em;
}

.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, .55);
  font-size: 10px;
}

.legend i {
  width: 9px;
  height: 9px;
  display: inline-block;
  margin-right: 5px;
  border: 1px solid rgba(255, 255, 255, .3);
  border-radius: 50%;
}

.legend .seen {
  border: 2px solid #5ed0a2;
}

.legend .root {
  border-color: var(--yellow);
  background: var(--yellow);
}

.legend .journey {
  width: 18px;
  height: 0;
  border-width: 0;
  border-top: 2px solid #6bbdff;
  border-radius: 0;
  transform: translateY(-3px);
}

.legend .active {
  width: 18px;
  height: 0;
  border-width: 0;
  border-top: 3px solid var(--yellow);
  border-radius: 0;
  transform: translateY(-3px);
}

.cloud-legend {
  margin-top: 16px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + var(--safe-bottom));
  z-index: 20;
  transform: translate(-50%, 20px);
  border-radius: 999px;
  padding: 12px 18px;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transition: .25s;
  box-shadow: 0 15px 40px rgba(0, 0, 0, .24);
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.ai-loading {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  place-items: center;
  background: rgba(245, 243, 237, .82);
  backdrop-filter: blur(4px);
}

.ai-loading.show {
  display: grid;
}

.ai-loading .box {
  display: flex;
  align-items: center;
  gap: 14px;
  border-radius: 24px;
  padding: 22px 28px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .24);
}

@media (max-width: 860px) {
  .learning-pulse,
  .today-review,
  .learning-library,
  .learning-data-tools,
  .cloud-account-tools {
    margin-top: 46px;
  }

  .today-review-row {
    grid-template-columns: minmax(140px, .8fr) minmax(130px, 1fr) auto 96px;
    gap: 12px;
  }

  .learning-session-open {
    grid-template-columns: minmax(140px, .7fr) minmax(160px, 1fr) auto;
    gap: 14px;
  }

  .cloud-card {
    min-height: 560px;
  }

  .cloud-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .cloud-stage {
    grid-template-columns: 1fr;
  }

  .cloud-graph {
    min-height: 460px;
  }
}

@media (max-width: 560px) {
  .math-tool-candidates {
    grid-template-columns: 1fr;
  }

  .math-tool-panel-head,
  .math-tool-result-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .learning-pulse {
    align-items: start;
    flex-direction: column;
    gap: 20px;
  }

  .learning-pulse-metrics {
    width: 100%;
    min-width: 0;
    gap: 16px;
  }

  .learning-data-tools,
  .cloud-account-tools {
    align-items: stretch;
    flex-direction: column;
    gap: 18px;
  }

  .learning-data-actions,
  .cloud-account-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cloud-account-actions {
    width: 100%;
  }

  .learning-data-action {
    width: 100%;
    min-width: 0;
  }

  .quiz-head {
    align-items: start;
  }

  .quiz-question {
    padding: 15px 13px;
  }

  .quiz-submit-row {
    align-items: stretch;
    flex-direction: column;
  }

  .quiz-submit {
    width: 100%;
  }

  .today-review-head,
  .learning-library-head {
    align-items: start;
  }

  .today-review-row {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px 12px;
    padding: 14px 2px;
  }

  .today-review-formula {
    grid-column: 1;
  }

  .today-review-reason {
    grid-column: 1;
    grid-row: 3;
  }

  .today-review-open {
    grid-column: 2;
    grid-row: 1 / 4;
  }

  .review-mode-note {
    align-items: flex-start;
    flex-direction: column;
    gap: 3px;
  }

  .review-completion {
    grid-template-columns: 24px minmax(0, 1fr);
  }

  .review-completion button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .learning-session-row {
    grid-template-columns: minmax(0, 1fr) 56px;
  }

  .learning-session-open {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding: 16px 10px 16px 2px;
  }

  .learning-session-title {
    justify-content: space-between;
  }

  .learning-session-formula {
    min-height: 28px;
  }

  .learning-session-meta {
    min-width: 0;
    grid-template-columns: minmax(0, 1fr) auto;
    text-align: left;
  }

  .learning-session-updated {
    text-align: right;
  }

  .learning-mastery-summary {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .detail-title-row {
    align-items: flex-start;
  }
}
.primary-soft-btn {
  border: 1px solid #8eb9a7;
  border-radius: 10px;
  padding: 10px 14px;
  color: #175f47;
  background: #eaf5f0;
  font: inherit;
  cursor: pointer;
}

.primary-soft-btn:hover {
  border-color: #1f7a5a;
  background: #dff0e8;
}

.inquiry-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px solid #d2e5dc;
  border-radius: 14px;
  background: linear-gradient(105deg, #f4faf7, #fffaf2);
}

.inquiry-entry b,
.inquiry-entry span { display: block; }
.inquiry-entry span { margin-top: 3px; color: #6e827a; font-size: 12px; }

@media (max-width: 640px) {
  .inquiry-entry { align-items: stretch; flex-direction: column; }
}