/* Math for AI shared learning runtime — extensions for the existing HerAI lesson template. */
.math-course-overview .math-overview-heading {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 16px;
}

.math-course-overview .math-overview-heading > div {
  min-width: 0;
}

.math-course-overview .math-overview-heading .v2-back-btn {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--fellow-line, rgba(84, 55, 73, 0.14));
  border-radius: 50%;
  background: #fff;
  color: var(--fellow-text, #202033);
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.math-course-overview .math-overview-heading .v2-back-btn:hover,
.math-course-overview .math-overview-heading .v2-back-btn:focus-visible {
  border-color: var(--fellow-pink, #f63392);
  color: var(--fellow-pink, #f63392);
  transform: translateX(-2px);
}

.math-course-overview .math-overview-heading .v2-back-btn:focus-visible,
.math-course-overview .math-submodule-grid .lesson-action:focus-visible,
.math-course-overview .resource-card a:focus-visible {
  outline: 3px solid rgba(246, 51, 146, 0.28);
  outline-offset: 3px;
}

.math-course-overview .math-overview-heading h1 {
  margin: 0 0 4px;
}

.math-course-overview .math-overview-heading p:not(.math-overview-eyebrow) {
  max-width: 72ch;
  margin: 0;
}

.math-course-overview .math-overview-eyebrow,
.math-course-overview .math-hierarchy-label {
  margin: 0 0 5px;
  color: var(--fellow-pink, #f63392);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.math-course-overview .math-overview-breadcrumb {
  margin: -8px 0 20px;
}

.math-course-overview .math-course-hero {
  background: linear-gradient(112deg, #fff 0%, #fff9fc 52%, #ffe7f2 100%);
}

.math-course-overview .math-submodule-grid article:nth-child(7) {
  --lesson-accent: #7357c7;
  --lesson-soft: #f5f1ff;
  --lesson-line: rgba(115, 87, 199, 0.22);
}

.math-course-overview .math-submodule-grid article.locked {
  background: linear-gradient(150deg, #fff 44%, #f7f5f7 155%);
  border-color: rgba(84, 55, 73, 0.12);
}

.math-course-overview .math-submodule-grid article.locked::before {
  background: #aaa4ad;
}

.math-course-overview .math-submodule-grid article.locked::after {
  background: #f4f1f4;
}

.math-course-overview .math-submodule-grid article.locked > i {
  background: #f6f3f6 !important;
  border-color: rgba(84, 55, 73, 0.12);
  box-shadow: none;
  color: #77717b !important;
}

.math-course-overview .math-submodule-grid article.locked > i::after {
  background: #aaa4ad;
}

.math-course-overview .math-submodule-status {
  width: fit-content;
  margin: 0;
  color: #696370;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.02em;
}

.math-course-overview .math-submodule-status.is-ready {
  color: #207a57;
}

.math-course-overview .math-submodule-grid button:disabled {
  min-height: 44px;
  border-color: rgba(84, 55, 73, 0.12);
  background: #f6f3f6;
  color: #77717b;
  cursor: not-allowed;
  opacity: 1;
}

.math-course-overview .math-overview-note .module-side-head > i {
  color: var(--fellow-pink, #f63392);
}

.math-course-overview .course-summary-card[data-math-overview-state] {
  column-gap: 16px;
  grid-template-columns: minmax(124px, 140px) minmax(0, 1fr);
  padding: 22px;
  row-gap: 16px;
}

.math-course-overview .course-summary-card[data-math-overview-state] h2 {
  font-size: 0.98rem;
  margin: 0;
}

.math-course-overview .course-summary-card[data-math-overview-state] .progress-donut {
  align-self: center;
  box-shadow: 0 0 0 1px rgba(80, 52, 69, 0.06), 0 15px 32px rgba(118, 48, 84, 0.1);
  justify-self: center;
  width: min(140px, 100%);
  --completed-end: 0%;
  --started-end: 0%;
  background: conic-gradient(#43B581 0% var(--completed-end, 0%), #f0eaf0 var(--completed-end, 0%) 100%);
}

.math-course-overview .course-summary-card[data-math-overview-state] .progress-donut::after {
  background: #fffafd;
  box-shadow: inset 0 0 0 1px rgba(80, 52, 69, 0.06);
  inset: 22px;
}

.math-course-overview .course-summary-card[data-math-overview-state] .progress-donut strong {
  color: #241d29;
  font-size: 1.75rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.045em;
  line-height: 1;
}

.math-course-overview .course-summary-card[data-math-overview-state] .progress-donut span {
  color: #746b78;
  font-size: 0.62rem;
  margin-top: 5px;
}

.math-course-overview .course-summary-card[data-math-overview-state] ul {
  gap: 8px;
}

.math-course-overview .course-summary-card[data-math-overview-state] li {
  background: #fffafd;
  border: 1px solid rgba(91, 62, 80, 0.08);
  border-radius: 12px;
  gap: 9px;
  padding: 8px 10px;
}

.math-course-overview .course-summary-card[data-math-overview-state] li strong {
  color: #4c4451;
  font-size: 0.72rem;
  margin-bottom: 2px;
}

.math-course-overview .course-summary-card[data-math-overview-state] li span {
  font-size: 0.7rem;
}

.math-course-overview .course-summary-card[data-math-overview-state] .summary-sync-state {
  background: #f7f4f7;
  border-radius: 10px;
  grid-column: 1 / -1;
  line-height: 1.5;
  margin: 0;
  padding: 9px 11px;
  text-align: left;
}

.math-course-overview .course-summary-card[data-math-overview-state] .summary-sync-state::before {
  background: #7d7480;
  border-radius: 50%;
  content: "";
  display: inline-block;
  height: 7px;
  margin-right: 7px;
  width: 7px;
}

.math-course-overview .course-summary-card[data-math-overview-state="ready"] .summary-sync-state {
  background: #edf9f4;
  color: #176b4a;
}

.math-course-overview .course-summary-card[data-math-overview-state="ready"] .summary-sync-state::before {
  background: #1fa971;
}

.math-course-overview .course-summary-card[data-math-overview-state="pending"] .summary-sync-state,
.math-course-overview .course-summary-card[data-math-overview-state="local"] .summary-sync-state {
  background: #fff7e9;
  color: #7b4b15;
}

.math-course-overview .course-summary-card[data-math-overview-state="pending"] .summary-sync-state::before,
.math-course-overview .course-summary-card[data-math-overview-state="local"] .summary-sync-state::before {
  background: #d88a2d;
}

.math-course-overview .course-summary-card[data-math-overview-state="error"] .summary-sync-state {
  background: #fff0f5;
  color: #9e255b;
}

.math-course-overview .course-summary-card[data-math-overview-state="error"] .summary-sync-state::before {
  background: #c52f70;
}

.math-overview-retry {
  align-items: center;
  background: #fff;
  border: 1px solid rgba(198, 43, 111, 0.3);
  border-radius: 11px;
  color: #aa245f;
  cursor: pointer;
  display: inline-flex;
  font: 800 0.76rem 'Plus Jakarta Sans', sans-serif;
  gap: 8px;
  grid-column: 1 / -1;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
}

.math-overview-retry[hidden] {
  display: none;
}

.math-course-overview .math-submodule-progress {
  align-items: center;
  background: color-mix(in srgb, var(--lesson-soft) 72%, #fff);
  border: 1px solid var(--lesson-line);
  border-radius: 999px;
  color: var(--lesson-accent);
  display: inline-flex;
  font-size: 0.7rem;
  font-weight: 800;
  gap: 7px;
  line-height: 1.25;
  padding: 7px 10px;
  width: fit-content;
}

@keyframes math-overview-shimmer {
  from { background-position: 120% 0; }
  to { background-position: -120% 0; }
}

@keyframes math-overview-spin {
  to { transform: rotate(360deg); }
}

.math-course-overview .course-summary-card[data-math-overview-state="loading"] .progress-donut {
  background: #eee8ed;
}

.math-course-overview .course-summary-card[data-math-overview-state="loading"] .progress-donut::before {
  animation: math-overview-spin 1.05s linear infinite;
  background: conic-gradient(from 35deg, transparent 0 64%, #f63392 78%, #8b5cf6 92%, transparent 100%);
  border-radius: 50%;
  content: "";
  inset: 0;
  position: absolute;
}

.math-course-overview .course-summary-card[data-math-overview-state="loading"] .progress-donut strong,
.math-course-overview .course-summary-card[data-math-overview-state="loading"] li b {
  animation: math-overview-shimmer 1.25s ease-in-out infinite;
  background: linear-gradient(100deg, #eee8ed 20%, #fff 42%, #eee8ed 64%);
  background-size: 220% 100%;
  border-radius: 6px;
  color: transparent;
  min-width: 30px;
  overflow: hidden;
}

.math-course-overview .course-summary-card[data-math-overview-state="loading"] .summary-sync-state::before {
  animation: math-overview-spin 1s linear infinite;
  background: transparent;
  border: 2px solid rgba(246, 51, 146, 0.22);
  border-right-color: #f63392;
  height: 9px;
  width: 9px;
}

@media (hover: hover) and (pointer: fine) {
  .math-course-overview .math-submodule-grid article.locked:hover,
  .math-course-overview .math-submodule-grid article.locked:focus-within {
    border-color: rgba(84, 55, 73, 0.12);
    box-shadow: 0 8px 24px rgba(142, 48, 91, 0.045);
    transform: none;
  }

  .math-course-overview .math-submodule-grid article.locked:hover::after,
  .math-course-overview .math-submodule-grid article.locked:focus-within::after,
  .math-course-overview .math-submodule-grid article.locked:hover > i,
  .math-course-overview .math-submodule-grid article.locked:focus-within > i {
    transform: none;
  }
}

@media (max-width: 860px) {
  .math-course-overview .module-topbar {
    position: relative;
  }
}

@media (max-width: 680px) {
  .math-course-overview .math-overview-heading {
    align-items: flex-start;
  }

  .math-course-overview .math-overview-heading p:not(.math-overview-eyebrow) {
    display: none;
  }

  .math-course-overview .math-overview-breadcrumb {
    margin-top: 0;
  }

  .math-course-overview .math-course-hero {
    grid-template-columns: minmax(0, 1fr);
    padding: 28px 24px 0;
  }

  .math-course-overview .math-course-hero > div {
    width: 100%;
    padding-bottom: 8px;
  }

  .math-course-overview .math-course-hero h2 {
    max-width: 18ch;
    font-size: clamp(1.65rem, 8vw, 2rem);
  }

  .math-course-overview .math-course-hero img {
    width: min(230px, 74%);
    max-height: 220px;
    justify-self: end;
  }

  .math-course-overview .course-summary-card[data-math-overview-state] {
    grid-template-columns: minmax(0, 1fr);
  }

  .math-course-overview .course-summary-card[data-math-overview-state] .progress-donut {
    width: 148px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .math-course-overview .math-overview-heading .v2-back-btn,
  .math-course-overview .math-submodule-grid article,
  .math-course-overview .math-submodule-grid article > i {
    transition: none;
  }

  .math-course-overview .course-summary-card[data-math-overview-state="loading"] .progress-donut::before,
  .math-course-overview .course-summary-card[data-math-overview-state="loading"] .progress-donut strong,
  .math-course-overview .course-summary-card[data-math-overview-state="loading"] li b,
  .math-course-overview .course-summary-card[data-math-overview-state="loading"] .summary-sync-state::before {
    animation: none;
  }
}

.math-learning-page {
  --math-ink: #202033;
  --math-muted: #66667a;
  --math-accent: var(--fellow-pink, #f63392);
  --math-accent-strong: #c9166c;
  --math-accent-soft: #fff0f7;
  --math-code-surface: #fff5fa;
  --math-code-ink: #4f3040;
  --math-code-border: rgba(231, 46, 135, 0.2);
  --math-border: var(--fellow-line, rgba(84, 55, 73, 0.14));
  --math-success: #207a57;
  --math-success-soft: #edf9f4;
  --math-warning: #8a5315;
  --math-warning-soft: #fff7e9;
  --math-info: #2f5f8f;
  --math-info-soft: #eef6ff;
  --math-danger: #aa3445;
  --math-danger-soft: #fff1f3;
  --math-radius-sm: 10px;
  --math-radius: 16px;
  --math-radius-lg: 20px;
  --math-reading: 76ch;
}

.math-learning-root {
  min-width: 0;
}

.math-learning-loading,
.math-learning-error {
  width: min(680px, 100%);
  min-height: 260px;
  margin: 42px auto;
  padding: 40px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius-lg);
  background: #fff;
  box-shadow: var(--fellow-shadow-card, 0 12px 34px rgba(142, 48, 91, 0.08));
  color: var(--math-muted);
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  text-align: center;
}

.math-learning-loading i,
.math-learning-error > i {
  color: var(--math-accent);
  font-size: 28px;
}

.math-learning-loading strong,
.math-learning-error h1 {
  margin: 0;
  color: var(--math-ink);
  font-size: clamp(22px, 3vw, 30px);
}

.math-learning-loading::after {
  animation: math-loading-sweep 1.15s ease-in-out infinite;
  background: linear-gradient(90deg, transparent, var(--math-accent), #8b5cf6, transparent);
  border-radius: 999px;
  content: "";
  height: 3px;
  margin-top: 6px;
  width: min(220px, 68%);
}

@keyframes math-loading-sweep {
  0% { opacity: 0.3; transform: scaleX(0.28); }
  50% { opacity: 1; transform: scaleX(1); }
  100% { opacity: 0.3; transform: scaleX(0.28); }
}

.math-learning-next-link.is-loading {
  cursor: progress;
  min-width: 190px;
  pointer-events: none;
}

.math-learning-error button,
.math-learning-complete-button {
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--math-accent);
  border-radius: 10px;
  background: var(--math-accent);
  color: #fff;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.math-learning-complete-button {
  width: 100%;
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.math-learning-complete-button.is-complete {
  border-color: var(--math-success);
  background: var(--math-success);
}

.math-learning-lesson-hero {
  background: linear-gradient(105deg, #fff 0%, #fff 48%, #ffe7f2 100%);
}

.math-learning-lesson-hero .lesson-hero-copy {
  padding-left: 14px;
}

.math-learning-lesson-hero h1 {
  max-width: 22ch;
  font-size: clamp(2rem, 4vw, 3.45rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.math-learning-lesson-hero p {
  display: -webkit-box;
  max-width: 68ch;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.math-learning-kicker {
  color: var(--math-accent-strong);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.math-learning-material-panel {
  min-width: 0;
}

.math-learning-article {
  min-width: 0;
  padding: clamp(24px, 4vw, 42px);
}

.math-learning-article:focus {
  outline: none;
}

.math-learning-markdown {
  width: min(var(--math-reading), 100%);
  margin: 0 auto;
  color: var(--math-ink);
  font-size: 16px;
  line-height: 1.78;
  overflow-wrap: anywhere;
}

.math-learning-markdown > :first-child {
  margin-top: 0;
}

.math-learning-markdown h2,
.math-learning-markdown h3,
.math-learning-markdown h4 {
  color: var(--math-ink);
  line-height: 1.3;
  text-wrap: balance;
  scroll-margin-top: 90px;
}

.math-learning-markdown h2 {
  margin: 58px 0 18px;
  padding-top: 4px;
  font-size: clamp(24px, 3vw, 31px);
  letter-spacing: -0.02em;
}

.math-learning-markdown h3 {
  margin: 34px 0 12px;
  font-size: clamp(19px, 2.4vw, 23px);
}

.math-learning-markdown h4 {
  margin: 24px 0 10px;
  font-size: 17px;
}

.math-learning-markdown p,
.math-learning-markdown li {
  color: #4d5469;
}

.math-learning-markdown p {
  max-width: none;
  margin: 0 0 20px;
  font-size: inherit;
  line-height: inherit;
}

.math-learning-markdown ul,
.math-learning-markdown ol {
  margin: 0 0 24px;
  padding-left: 1.45em;
}

.math-learning-markdown li {
  margin: 6px 0;
  padding-left: 4px;
}

.math-learning-markdown li::marker {
  color: var(--math-accent);
  font-weight: 800;
}

.math-learning-markdown blockquote {
  margin: 26px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--math-accent);
  border-radius: 0 var(--math-radius) var(--math-radius) 0;
  background: var(--math-accent-soft);
  color: #684052;
}

.math-learning-markdown blockquote p:last-child {
  margin-bottom: 0;
}

.math-learning-markdown hr {
  height: 1px;
  margin: 38px 0;
  border: 0;
  background: var(--math-border);
}

.math-learning-markdown a {
  color: var(--math-accent-strong);
  font-weight: 700;
  text-underline-offset: 3px;
}

.math-learning-markdown code {
  padding: 0.14em 0.38em;
  border: 1px solid rgba(231, 46, 135, 0.13);
  border-radius: 6px;
  background: #fff4f9;
  color: #9d285e;
  font-size: 0.88em;
  white-space: break-spaces;
}

.math-learning-markdown pre {
  margin: 24px 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--math-code-border);
  border-radius: var(--math-radius);
  background: linear-gradient(145deg, var(--math-code-surface), #ffedf6);
  box-shadow: inset 4px 0 0 rgba(246, 51, 146, 0.34);
  color: var(--math-code-ink);
  scrollbar-color: rgba(201, 22, 108, 0.42) transparent;
}

.math-learning-markdown pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  white-space: pre;
}

.math-learning-table-wrap {
  width: 100%;
  margin: 26px 0;
  overflow-x: auto;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}

.math-learning-table-wrap table {
  width: 100%;
  min-width: 560px;
  margin: 0;
  border-collapse: collapse;
  font-size: 14px;
}

.math-learning-table-wrap th,
.math-learning-table-wrap td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--math-border);
  color: #4d5469;
  text-align: left;
  vertical-align: top;
}

.math-learning-table-wrap th {
  background: #fff5fa;
  color: var(--math-ink);
  font-weight: 800;
}

.math-learning-table-wrap tr:last-child td {
  border-bottom: 0;
}

.math-learning-table-wrap :is(th, td):has(.katex),
.math-learning-table-wrap :is(th, td):has(code) {
  white-space: nowrap;
}

.math-learning-math-inline {
  display: inline-flex;
  max-width: 100%;
  vertical-align: -0.08em;
}

.math-learning-math-display {
  width: 100%;
  margin: 24px 0;
  padding: 12px 4px;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
  -webkit-overflow-scrolling: touch;
}

.math-learning-math-display .katex-display {
  width: max-content;
  min-width: 100%;
  margin: 0;
}

.math-learning-math-error {
  padding: 2px 5px;
  border-radius: 5px;
  background: var(--math-danger-soft);
  color: var(--math-danger);
}

.math-learning-context {
  width: min(100%, 820px);
  margin: 0 auto 30px;
  padding: 14px;
  border: 1px solid rgba(231, 46, 135, 0.16);
  border-radius: var(--math-radius-lg);
  background: linear-gradient(145deg, #fffafd, #fff);
  display: grid;
  gap: 10px;
}

.math-learning-context-item {
  min-width: 0;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.86);
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  align-items: start;
  gap: 11px;
}

.math-learning-context-item > i {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: var(--math-accent-soft);
  color: var(--math-accent);
  display: grid;
  place-items: center;
}

.math-learning-context-item strong {
  color: var(--math-ink);
  font-size: 13px;
  letter-spacing: 0.01em;
}

.math-learning-context-item p {
  max-width: none;
  margin: 3px 0 0;
  color: var(--math-muted);
  font-size: 14px;
  line-height: 1.65;
}

.math-learning-reveal {
  margin: 24px 0;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fffafd;
}

.math-learning-reveal summary {
  min-height: 48px;
  padding: 12px 16px;
  color: var(--math-ink);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 9px;
}

.math-learning-reveal-body {
  padding: 4px 18px 18px;
}

.math-learning-interactive {
  width: min(880px, calc(100vw - 80px));
  margin: 36px 50% 40px;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid rgba(231, 46, 135, 0.2);
  border-radius: var(--math-radius-lg);
  background: linear-gradient(145deg, #fff, #fff8fc);
  box-shadow: 0 14px 34px rgba(96, 40, 70, 0.07);
  transform: translateX(-50%);
}

.math-learning-interactive-head {
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.math-learning-interactive-icon {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 13px;
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
  display: grid;
  place-items: center;
}

.math-learning-interactive-head span {
  color: var(--math-accent-strong);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.math-learning-interactive-head h3 {
  margin: 3px 0 0;
  color: var(--math-ink);
  font-size: clamp(20px, 2.6vw, 26px);
}

.math-learning-interactive-guidance {
  margin: -2px 0 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.math-learning-interactive-guidance > div {
  padding: 13px 15px;
  border-left: 3px solid rgba(231, 46, 135, 0.5);
  border-radius: 0 var(--math-radius-sm) var(--math-radius-sm) 0;
  background: rgba(255, 240, 247, 0.62);
  color: var(--math-muted);
  font-size: 13px;
  line-height: 1.55;
}

.math-learning-interactive-guidance strong {
  display: block;
  margin-bottom: 3px;
  color: var(--math-ink);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.math-learning-interactive-guidance p {
  margin: 0;
}

.math-learning-interactive-grid,
.math-learning-compare,
.math-learning-control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.math-learning-interactive-card {
  min-width: 0;
  padding: 17px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: rgba(255, 255, 255, 0.92);
}

.math-learning-interactive-card h4 {
  margin: 0 0 8px;
  color: var(--math-ink);
  font-size: 15px;
}

.math-learning-interactive-card p:last-child {
  margin-bottom: 0;
}

.math-learning-control {
  color: var(--math-muted);
  display: grid;
  gap: 8px;
  font-size: 13px;
  font-weight: 750;
}

.math-learning-control input,
.math-learning-control select {
  width: 100%;
  min-height: 44px;
  padding: 8px 11px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius-sm);
  background: #fff;
  color: var(--math-ink);
  font: inherit;
}

.math-learning-control input[type="range"] {
  padding: 0;
  accent-color: var(--math-accent);
}

.math-learning-button-row {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.math-learning-action,
.math-learning-choice,
.math-learning-step-button {
  min-height: 44px;
  padding: 9px 16px;
  border: 1px solid var(--math-border);
  border-radius: 999px;
  background: #fff;
  color: var(--math-ink);
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.math-learning-action:hover,
.math-learning-choice:hover,
.math-learning-step-button:hover,
.math-learning-choice.is-selected {
  border-color: rgba(231, 46, 135, 0.42);
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
}

.math-learning-action.is-primary {
  border-color: var(--math-accent);
  background: var(--math-accent);
  color: #fff;
}

.math-learning-feedback {
  min-height: 48px;
  margin-top: 18px;
  padding: 13px 15px;
  border-radius: var(--math-radius-sm);
  background: var(--math-info-soft);
  color: var(--math-info);
  line-height: 1.55;
}

.math-learning-feedback.is-success { background: var(--math-success-soft); color: var(--math-success); }
.math-learning-feedback.is-warning { background: var(--math-warning-soft); color: var(--math-warning); }
.math-learning-feedback.is-error { background: var(--math-danger-soft); color: var(--math-danger); }

.math-learning-equation-result {
  margin-top: 18px;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--math-code-border);
  border-radius: var(--math-radius);
  background: linear-gradient(145deg, var(--math-code-surface), #ffedf6);
  color: var(--math-code-ink);
  text-align: center;
  font-variant-numeric: tabular-nums;
  scrollbar-color: rgba(201, 22, 108, 0.42) transparent;
}

.math-learning-la-result,
.math-learning-matrix-stage {
  min-width: 0;
  margin-top: 18px;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fff;
  color: var(--math-ink);
  scrollbar-color: rgba(201, 22, 108, 0.42) transparent;
  -webkit-overflow-scrolling: touch;
}

.math-learning-la-result > :last-child,
.math-learning-matrix-stage > :last-child {
  margin-bottom: 0;
}

.math-learning-la-result.is-valid {
  border-color: rgba(32, 122, 87, 0.35);
  background: var(--math-success-soft);
  color: var(--math-success);
}

.math-learning-la-result.is-invalid {
  border-color: rgba(170, 52, 69, 0.35);
  background: var(--math-danger-soft);
  color: var(--math-danger);
}

.math-learning-scalar-pair,
.math-learning-contribution-row,
.math-learning-score-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.math-learning-scalar-pair > span,
.math-learning-contribution-row > span,
.math-learning-score-list > span {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius-sm);
  background: #fffafd;
  color: var(--math-ink);
}

.math-learning-scalar-pair small,
.math-learning-score-list strong {
  display: block;
  color: var(--math-muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.math-learning-scalar-pair strong,
.math-learning-score-list output {
  display: block;
  margin-top: 4px;
  color: var(--math-accent-strong);
  font-size: 18px;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.math-learning-score-list {
  grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
}

.math-learning-matrix-grid,
.math-learning-score-matrix {
  width: max-content;
  min-width: min(100%, 300px);
  margin: 0 auto;
  padding: 8px 14px;
  border-left: 2px solid var(--math-ink);
  border-right: 2px solid var(--math-ink);
  border-radius: 9px;
  display: grid;
  gap: 7px;
}

.math-learning-matrix-grid {
  grid-template-columns: repeat(2, minmax(88px, 1fr));
}

.math-learning-score-matrix {
  grid-template-columns: repeat(3, minmax(92px, 1fr));
}

.math-learning-matrix-grid button,
.math-learning-score-matrix button {
  min-width: 0;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: #fff8fc;
  color: var(--math-ink);
  font: inherit;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
}

.math-learning-matrix-grid button:hover,
.math-learning-score-matrix button:hover,
.math-learning-matrix-grid button.is-highlighted,
.math-learning-score-matrix button.is-highlighted {
  border-color: rgba(231, 46, 135, 0.42);
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
}

.math-learning-matrix-expression {
  min-width: 340px;
  padding: 16px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius-sm);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 800;
}

.math-learning-matrix-expression .is-active {
  padding: 7px 10px;
  border-radius: 8px;
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
}

.math-learning-la-geometry {
  width: 100%;
  min-width: 280px;
  min-height: 230px;
  margin-top: 18px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fff;
}

.math-learning-la-geometry text {
  fill: var(--math-muted);
  font-size: 12px;
  font-weight: 700;
}

.math-learning-la-geometry .axis {
  stroke: #81798a;
  stroke-width: 1.4;
}

.math-learning-la-geometry .guide {
  fill: none;
  stroke: rgba(231, 46, 135, 0.52);
  stroke-width: 2.2;
  stroke-dasharray: 6 5;
}

.math-learning-la-geometry .vector {
  stroke: var(--math-accent);
  stroke-width: 4;
  stroke-linecap: round;
}

.math-learning-la-geometry .vector.is-fixed {
  stroke: #7357c7;
}

.math-learning-la-geometry .plot-point {
  fill: #fff;
  stroke: var(--math-accent);
  stroke-width: 3;
}

.math-learning-shape-grid {
  width: max-content;
  min-width: min(100%, 260px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(var(--shape-columns), minmax(38px, 1fr));
  gap: 6px;
}

.math-learning-shape-grid span {
  min-height: 38px;
  border: 1px solid rgba(231, 46, 135, 0.24);
  border-radius: 8px;
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 800;
}

.math-learning-spec-fallback {
  display: grid;
  gap: 14px;
}

.math-learning-spec-details {
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fff;
}

.math-learning-spec-details summary {
  min-height: 48px;
  padding: 12px 15px;
  color: var(--math-ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
}

.math-learning-spec-details > div {
  padding: 0 17px 17px;
}

.math-learning-spec-safety {
  margin-top: 14px;
  padding: 14px 16px;
  border-left: 4px solid var(--math-warning);
  border-radius: 0 var(--math-radius-sm) var(--math-radius-sm) 0;
  background: var(--math-warning-soft);
  color: var(--math-warning);
}

.math-learning-spec-safety strong {
  display: block;
  margin-bottom: 5px;
}

.math-learning-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.math-learning-chip {
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--math-border);
  border-radius: 10px;
  background: #fff;
  color: var(--math-ink);
  font-size: 13px;
  font-weight: 750;
}

.math-learning-quiz-intro,
.math-learning-preview-note {
  margin-bottom: 22px;
}

.math-learning-preview-note {
  padding: 14px 16px;
  border-left: 4px solid var(--math-warning);
  border-radius: 0 var(--math-radius-sm) var(--math-radius-sm) 0;
  background: var(--math-warning-soft);
  color: #74420e;
  font-size: 14px;
}

.math-learning-diagnostic {
  margin: 52px 0 42px;
}

.math-learning-diagnostic-heading {
  margin-bottom: 18px;
}

.math-learning-diagnostic-heading > span {
  color: var(--math-accent-strong);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.math-learning-diagnostic-heading h2 {
  margin: 6px 0 0;
}

.math-learning-diagnostic-intro {
  margin-bottom: 22px;
  padding: 17px 18px;
  border-left: 4px solid var(--math-accent);
  border-radius: 0 var(--math-radius) var(--math-radius) 0;
  background: var(--math-accent-soft);
}

.math-learning-diagnostic-intro p:last-child {
  margin-bottom: 0;
}

.math-learning-diagnostic-list {
  display: grid;
  gap: 18px;
}

.math-learning-diagnostic-question {
  min-width: 0;
  margin: 0;
  padding: 20px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fff;
}

.math-learning-diagnostic-prompt {
  margin-bottom: 15px;
  color: var(--math-ink);
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  font-weight: 750;
}

.math-learning-diagnostic-prompt > span {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 850;
}

.math-learning-diagnostic-prompt p,
.math-learning-diagnostic-option p,
.math-learning-diagnostic-result p {
  margin: 0;
  color: inherit;
}

.math-learning-diagnostic-options {
  display: grid;
  gap: 10px;
}

.math-learning-diagnostic-option {
  min-height: 48px;
  padding: 10px 13px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius-sm);
  background: #fff;
  color: var(--math-ink);
  cursor: pointer;
  display: grid;
  grid-template-columns: 20px 30px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.math-learning-diagnostic-option:hover,
.math-learning-diagnostic-option:has(input:checked) {
  border-color: rgba(231, 46, 135, 0.44);
  background: var(--math-accent-soft);
}

.math-learning-diagnostic-option input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--math-accent);
}

.math-learning-diagnostic-letter {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: #fff5fa;
  color: var(--math-accent-strong);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 850;
}

.math-learning-diagnostic-option.is-correct {
  border-color: rgba(32, 122, 87, 0.48);
  background: var(--math-success-soft);
}

.math-learning-diagnostic-option.is-correct .math-learning-diagnostic-letter {
  background: var(--math-success);
  color: #fff;
}

.math-learning-diagnostic-option.is-incorrect {
  border-color: rgba(170, 52, 69, 0.46);
  background: var(--math-danger-soft);
}

.math-learning-diagnostic-option.is-incorrect .math-learning-diagnostic-letter {
  background: var(--math-danger);
  color: #fff;
}

.math-learning-diagnostic-feedback {
  margin: 13px 0 0;
  padding: 11px 13px;
  border-radius: var(--math-radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.5;
}

.math-learning-diagnostic-feedback:empty {
  display: none;
}

.math-learning-diagnostic-feedback.is-correct {
  background: var(--math-success-soft);
  color: var(--math-success);
}

.math-learning-diagnostic-feedback.is-incorrect {
  background: var(--math-danger-soft);
  color: var(--math-danger);
}

.math-learning-diagnostic-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.math-learning-diagnostic-result {
  padding: 18px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fffafd;
  color: var(--math-ink);
}

.math-learning-diagnostic-result.is-warning {
  border-color: rgba(138, 83, 21, 0.3);
  background: var(--math-warning-soft);
  color: var(--math-warning);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.math-learning-diagnostic-result.is-warning strong,
.math-learning-diagnostic-result.is-warning p {
  display: block;
}

.math-learning-diagnostic-result.is-complete {
  border-color: rgba(231, 46, 135, 0.24);
  background: linear-gradient(145deg, #fff, var(--math-accent-soft));
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
}

.math-learning-diagnostic-score {
  min-width: 112px;
  padding: 14px;
  border-radius: 14px;
  background: var(--math-accent);
  color: #fff;
  text-align: center;
}

.math-learning-diagnostic-score strong {
  display: block;
  font-size: 30px;
  line-height: 1;
}

.math-learning-diagnostic-score strong span {
  color: inherit;
  font-size: 15px;
}

.math-learning-diagnostic-score small {
  color: inherit;
  font-size: 11px;
  font-weight: 750;
}

.math-learning-diagnostic-result.is-complete > div:last-child > span {
  color: var(--math-accent-strong);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.math-learning-diagnostic-result h3 {
  margin: 2px 0 5px;
  font-size: 21px;
}

.math-learning-quiz-list {
  display: grid;
  gap: 18px;
}

.math-learning-quiz-card {
  min-width: 0;
  margin: 0;
  padding: 24px 26px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: linear-gradient(145deg, #fff 72%, #fffafd 100%);
  box-shadow: 0 8px 24px rgba(142, 48, 91, 0.04);
}

.math-learning-quiz-prompt {
  margin-bottom: 20px;
  color: var(--math-ink);
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  font-weight: 750;
}

.math-learning-quiz-number {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(231, 46, 135, 0.2);
  border-radius: 13px;
  background: var(--math-accent-soft);
  color: var(--math-accent-strong);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.04em;
}

.math-learning-quiz-question-copy,
.math-learning-quiz-question-copy > .math-learning-markdown,
.math-learning-quiz-option-copy,
.math-learning-quiz-option-copy > .math-learning-markdown {
  width: 100%;
  min-width: 0;
}

.math-learning-markdown .math-learning-quiz-question-copy > p,
.math-learning-markdown .math-learning-quiz-question-copy > .math-learning-markdown > p {
  margin: 0 0 10px;
  line-height: 1.62;
}

.math-learning-markdown .math-learning-quiz-question-copy > :last-child,
.math-learning-markdown .math-learning-quiz-question-copy > .math-learning-markdown > :last-child,
.math-learning-markdown .math-learning-quiz-option-copy > p,
.math-learning-markdown .math-learning-quiz-option-copy > .math-learning-markdown > p {
  margin: 0;
  color: inherit;
}

.math-learning-markdown .math-learning-quiz-question-copy :is(ul, ol) {
  margin: 8px 0 12px;
}

.math-learning-markdown .math-learning-quiz-question-copy li {
  margin: 3px 0;
  line-height: 1.55;
}

.math-learning-markdown .math-learning-quiz-question-copy .math-learning-math-display {
  margin: 12px 0 14px;
  padding: 13px 14px;
}

.math-learning-quiz-options {
  display: grid;
  gap: 9px;
}

.math-learning-quiz-option {
  min-width: 0;
  min-height: 54px;
  padding: 10px 13px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius-sm);
  background: #fff;
  color: var(--math-ink);
  cursor: pointer;
  display: grid;
  grid-template-columns: 18px 30px minmax(0, 1fr);
  align-items: center;
  gap: 11px;
  transition: border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.math-learning-quiz-option:hover {
  border-color: rgba(231, 46, 135, 0.36);
  box-shadow: 0 5px 15px rgba(142, 48, 91, 0.05);
}

.math-learning-page .math-learning-quiz-option span {
  color: inherit;
}

.math-learning-quiz-letter {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: #fff5fa;
  color: var(--math-accent-strong);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 850;
}

.math-learning-quiz-option-copy {
  font-size: 14px;
  line-height: 1.55;
}

.math-learning-quiz-option:has(input:checked) {
  border-color: var(--math-accent);
  background: var(--math-accent-soft);
}

.math-learning-quiz-option:has(input:checked) .math-learning-quiz-letter {
  background: var(--math-accent);
  color: #fff;
}

.math-learning-quiz-option.is-correct {
  border-color: rgba(32, 122, 87, 0.46);
  background: var(--math-success-soft);
}

.math-learning-quiz-option.is-correct .math-learning-quiz-letter {
  background: var(--math-success);
  color: #fff;
}

.math-learning-quiz-option.is-incorrect {
  border-color: rgba(170, 52, 69, 0.46);
  background: var(--math-danger-soft);
}

.math-learning-quiz-option.is-incorrect .math-learning-quiz-letter {
  background: var(--math-danger);
  color: #fff;
}

.math-learning-quiz-option input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--math-accent);
}

.math-learning-quiz-review {
  margin-top: 16px;
  padding: 15px 16px;
  border-left: 4px solid var(--math-info);
  border-radius: var(--math-radius-sm);
  background: var(--math-info-soft);
  color: var(--math-info);
}

.math-learning-quiz-review > strong {
  margin-bottom: 7px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.math-learning-quiz-review.is-correct {
  border-left-color: var(--math-success);
  background: var(--math-success-soft);
  color: var(--math-success);
}

.math-learning-quiz-review.is-incorrect {
  border-left-color: var(--math-danger);
  background: var(--math-danger-soft);
  color: var(--math-danger);
}

.math-learning-markdown .math-learning-quiz-review > .math-learning-markdown {
  line-height: 1.6;
}

.math-learning-markdown .math-learning-quiz-review > .math-learning-markdown > :last-child {
  margin-bottom: 0;
}

.math-learning-quiz-actions {
  margin-top: 4px;
  padding-top: 4px;
}

.math-learning-quiz-card:focus {
  outline: 3px solid rgba(231, 46, 135, 0.25);
  outline-offset: 3px;
}

.math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero {
  grid-template-columns: minmax(0, 1.55fr) minmax(220px, 0.75fr);
  min-height: 300px;
}

.math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero .lesson-hero-copy {
  gap: 13px;
}

.math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero h1 {
  max-width: 21ch;
  font-size: clamp(2.15rem, 3.35vw, 3rem);
  line-height: 1.04;
}

.math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero img {
  max-height: 250px;
}

.math-learning-status-card .module-side-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.math-learning-status-card .module-side-head i {
  color: var(--math-accent);
}

.math-learning-svg {
  width: 100%;
  min-height: 250px;
  border: 1px solid var(--math-border);
  border-radius: var(--math-radius);
  background: #fff;
  touch-action: none;
}

.math-learning-svg text { fill: var(--math-muted); font-size: 11px; }
.math-learning-svg .axis { stroke: #757184; stroke-width: 1.2; }
.math-learning-svg .guide { stroke: rgba(231, 46, 135, 0.42); stroke-dasharray: 5 5; }
.math-learning-svg .plot-line { fill: none; stroke: var(--math-accent); stroke-width: 3; }
.math-learning-svg .plot-point { fill: #fff; stroke: var(--math-accent); stroke-width: 3; }

.math-learning-response-field,
.math-learning-discussion-form {
  margin: 24px 0 42px;
  padding: 22px;
  border: 1px solid rgba(231, 46, 135, 0.2);
  border-radius: 18px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(255, 244, 250, 0.92));
  box-shadow: 0 14px 32px rgba(105, 42, 79, 0.07);
}

.math-learning-response-field label,
.math-learning-discussion-form label {
  display: grid;
  gap: 4px;
  margin-bottom: 12px;
  color: #43263a;
}

.math-learning-response-field label span,
.math-learning-discussion-form label span {
  font-weight: 800;
}

.math-learning-response-field label small,
.math-learning-discussion-form label small {
  color: #756374;
  font-size: 0.85rem;
  line-height: 1.5;
}

.math-learning-response-field textarea,
.math-learning-discussion-form textarea {
  width: 100%;
  min-height: 150px;
  resize: vertical;
  padding: 14px 15px;
  border: 1px solid rgba(105, 65, 91, 0.25);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.96);
  color: #352231;
  font: inherit;
  line-height: 1.6;
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.math-learning-response-field textarea:hover,
.math-learning-discussion-form textarea:hover {
  border-color: rgba(231, 46, 135, 0.42);
}

.math-learning-response-field textarea:focus,
.math-learning-discussion-form textarea:focus {
  border-color: var(--math-accent);
  box-shadow: 0 0 0 4px rgba(231, 46, 135, 0.12);
  outline: none;
}

.math-learning-response-field textarea[readonly] {
  background: rgba(247, 242, 246, 0.9);
  color: #6b5a67;
}

.math-learning-response-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.math-learning-response-status {
  margin: 14px 0 0;
  padding: 11px 13px;
  border: 1px solid rgba(105, 65, 91, 0.14);
  border-radius: 11px;
  background: rgba(248, 245, 248, 0.9);
  color: #665560;
  font-size: 0.88rem;
  line-height: 1.5;
}

.math-learning-response-status.is-success {
  border-color: rgba(31, 145, 94, 0.24);
  background: rgba(232, 249, 240, 0.9);
  color: #176b48;
}

.math-learning-response-status.is-warning {
  border-color: rgba(190, 125, 15, 0.25);
  background: rgba(255, 248, 226, 0.94);
  color: #805b13;
}

.math-learning-response-status.is-error {
  border-color: rgba(193, 52, 75, 0.24);
  background: rgba(255, 237, 241, 0.94);
  color: #983047;
}

.math-learning-practice-form > .math-learning-response-status,
[data-discussion-overall] {
  margin-top: 18px;
}

.math-learning-visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.math-learning-page :where(a, button, input, select, textarea, summary):focus-visible {
  outline: 3px solid rgba(231, 46, 135, 0.35);
  outline-offset: 3px;
}

@media (max-width: 1120px) {
  .math-learning-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .math-learning-layout .lesson-right-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .math-learning-layout .lesson-list-card {
    grid-row: span 2;
  }
}

@media (max-width: 760px) {
  .math-learning-lesson-hero {
    grid-template-columns: minmax(0, 1fr);
    padding: 24px 20px;
  }

  .math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero {
    grid-template-columns: minmax(0, 1fr);
    min-height: 0;
  }

  .math-learning-lesson-hero .lesson-hero-copy {
    padding: 0;
  }

  .math-learning-lesson-hero img {
    display: none;
  }

  .math-learning-lesson-hero h1 {
    font-size: clamp(1.7rem, 8vw, 2.45rem);
  }

  .math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero h1 {
    max-width: none;
    font-size: clamp(1.8rem, 8vw, 2.15rem);
    line-height: 1.05;
  }

  .math-learning-root[data-math-content-type="quiz"] .math-learning-lesson-hero p {
    -webkit-line-clamp: 2;
  }

  .math-learning-article {
    padding: 25px 18px;
  }

  .math-learning-markdown {
    font-size: 16px;
    line-height: 1.72;
  }

  .math-learning-markdown h2 {
    margin-top: 46px;
  }

  .math-learning-diagnostic-question {
    padding: 16px;
  }

  .math-learning-diagnostic-option {
    padding: 11px;
    grid-template-columns: 18px 28px minmax(0, 1fr);
    gap: 8px;
  }

  .math-learning-diagnostic-actions .math-learning-action {
    flex: 1 1 150px;
  }

  .math-learning-diagnostic-result.is-complete {
    grid-template-columns: minmax(0, 1fr);
  }

  .math-learning-quiz-card {
    padding: 18px 16px;
  }

  .math-learning-quiz-prompt {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 11px;
  }

  .math-learning-quiz-number {
    width: 38px;
    height: 38px;
  }

  .math-learning-quiz-option {
    grid-template-columns: 18px 28px minmax(0, 1fr);
    padding: 11px;
    gap: 9px;
  }

  .math-learning-quiz-letter {
    width: 28px;
    height: 28px;
  }

  .math-learning-quiz-actions .math-learning-action {
    flex: 1 1 150px;
  }

  .math-learning-response-field,
  .math-learning-discussion-form {
    padding: 17px;
    margin-bottom: 32px;
  }

  .math-learning-response-actions .math-learning-action {
    flex: 1 1 150px;
  }

  .math-learning-diagnostic-score {
    width: 100%;
  }

  .math-learning-interactive {
    width: 100%;
    margin-left: 0;
    margin-right: 0;
    padding: 18px;
    transform: none;
  }

  .math-learning-interactive-grid,
  .math-learning-compare,
  .math-learning-control-grid,
  .math-learning-interactive-guidance,
  .math-learning-layout .lesson-right-panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .math-learning-scalar-pair,
  .math-learning-contribution-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .math-learning-score-list {
    grid-template-columns: repeat(2, minmax(92px, 1fr));
  }

  .math-learning-layout .lesson-list-card {
    grid-row: auto;
  }

  .math-learning-material-panel .lesson-tabs {
    min-height: 64px;
    padding: 0 12px;
  }

  .math-learning-material-panel .lesson-tabs a {
    font-size: 0.82rem;
    padding: 0 6px;
  }

  .math-learning-material-panel .lesson-nav-footer {
    gap: 10px;
    padding: 16px 18px;
  }

  .math-learning-material-panel .lesson-nav-footer a {
    min-width: 0;
    padding: 0 12px;
    font-size: 12px;
  }
}

@media (max-width: 430px) {
  .math-learning-table-wrap {
    width: calc(100vw - 76px);
  }

  .math-learning-la-result,
  .math-learning-matrix-stage {
    width: 100%;
    padding: 14px;
  }

  .math-learning-matrix-grid,
  .math-learning-score-matrix {
    margin-left: 0;
  }

  .math-learning-material-panel .lesson-nav-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .math-learning-material-panel .lesson-nav-footer a {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .math-learning-page *,
  .math-learning-page *::before,
  .math-learning-page *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}