:root {
  --learn-ink: #102a3a;
  --learn-muted: #597080;
  --learn-surface: #ffffff;
  --learn-surface-soft: #f4f8f7;
  --learn-line: #dbe7e5;
  --learn-brand: #117f75;
  --learn-brand-deep: #075b58;
  --learn-brand-pale: #dff4ef;
  --learn-gold: #f0ae3d;
  --learn-red: #c04f4c;
  --learn-words: #dd6a42;
  --learn-words-soft: #fff0e8;
  --learn-phrases: #5c68c9;
  --learn-phrases-soft: #eff0ff;
  --learn-phonics: #278d75;
  --learn-phonics-soft: #e5f6f0;
  --learn-shadow: 0 20px 55px rgba(18, 52, 63, 0.11);
  --learn-shadow-soft: 0 10px 30px rgba(18, 52, 63, 0.08);
  --learn-radius-xl: 30px;
  --learn-radius-lg: 22px;
  --learn-radius-md: 15px;
}

html[data-theme="dark"] {
  --learn-ink: #eef8f6;
  --learn-muted: #a8bfbd;
  --learn-surface: #112c35;
  --learn-surface-soft: #0b242d;
  --learn-line: #29464d;
  --learn-brand: #63cfbf;
  --learn-brand-deep: #9be5d8;
  --learn-brand-pale: #173f41;
  --learn-gold: #ffc76a;
  --learn-red: #ffaaa4;
  --learn-words: #ff9a73;
  --learn-words-soft: #432c28;
  --learn-phrases: #aeb5ff;
  --learn-phrases-soft: #292e51;
  --learn-phonics: #6cd4bb;
  --learn-phonics-soft: #163f39;
  --learn-shadow: 0 22px 60px rgba(0, 0, 0, 0.28);
  --learn-shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.learn-page {
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  color: var(--learn-ink);
  background:
    radial-gradient(circle at 6% 5%, rgba(96, 195, 177, 0.13), transparent 29rem),
    radial-gradient(circle at 94% 20%, rgba(240, 174, 61, 0.1), transparent 27rem),
    var(--learn-surface-soft);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

.learn-page button,
.learn-page input,
.learn-page select {
  font: inherit;
}

.learn-page button,
.learn-page a,
.learn-page select,
.learn-page input {
  -webkit-tap-highlight-color: transparent;
}

.learn-page button:focus-visible,
.learn-page a:focus-visible,
.learn-page select:focus-visible,
.learn-page input:focus-visible,
.learn-page [tabindex]:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--learn-brand) 70%, white);
  outline-offset: 3px;
}

.learn-page [data-student-hidden="true"] {
  display: none !important;
}

html[data-student-access="pending"] .learn-categories,
html[data-student-access="pending"] .learn-library {
  visibility: hidden;
}

.learn-header {
  position: sticky;
  z-index: 40;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 10px max(22px, calc((100vw - 1440px) / 2));
  border-bottom: 1px solid color-mix(in srgb, var(--learn-line) 76%, transparent);
  background: color-mix(in srgb, var(--learn-surface) 91%, transparent);
  box-shadow: 0 4px 18px rgba(13, 57, 66, 0.045);
  backdrop-filter: blur(18px);
}

.learn-brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  color: var(--learn-ink);
  text-decoration: none;
}

.learn-brand img {
  width: 46px;
  height: 46px;
  margin-right: 11px;
  border-radius: 14px;
  box-shadow: 0 6px 16px rgba(18, 89, 86, 0.17);
}

.learn-brand span,
.learn-brand strong,
.learn-brand small {
  display: block;
  min-width: 0;
}

.learn-brand strong {
  font-size: 0.96rem;
  letter-spacing: -0.01em;
}

.learn-brand small {
  margin-top: 1px;
  color: var(--learn-muted);
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
}

.learn-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.learn-home-link,
.learn-icon-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 14px;
  border: 1px solid var(--learn-line);
  border-radius: 12px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  font-size: 0.8rem;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.learn-home-link:hover,
.learn-icon-button:hover {
  border-color: var(--learn-brand);
  color: var(--learn-brand-deep);
}

.learn-compact-select,
.learn-audio-settings label {
  display: grid;
  gap: 3px;
  color: var(--learn-muted);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.learn-compact-select select,
.learn-audio-settings select,
.learn-review-meta select {
  min-height: 34px;
  padding: 5px 30px 5px 9px;
  border: 1px solid var(--learn-line);
  border-radius: 10px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  font-size: 0.77rem;
  font-weight: 750;
}

#main {
  min-height: calc(100vh - 76px);
}

#learnApp {
  width: min(1440px, calc(100% - 44px));
  margin-inline: auto;
  padding: 34px 0 90px;
}

.learn-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(330px, 0.6fr);
  gap: 34px;
  align-items: end;
  overflow: hidden;
  padding: clamp(28px, 5vw, 58px);
  border: 1px solid color-mix(in srgb, var(--learn-brand) 20%, var(--learn-line));
  border-radius: var(--learn-radius-xl);
  background:
    linear-gradient(120deg, color-mix(in srgb, var(--learn-surface) 94%, var(--learn-brand-pale)), var(--learn-surface));
  box-shadow: var(--learn-shadow);
}

.learn-hero::before,
.learn-hero::after {
  position: absolute;
  z-index: -1;
  border-radius: 999px;
  content: "";
}

.learn-hero::before {
  top: -110px;
  right: 18%;
  width: 300px;
  height: 300px;
  background: color-mix(in srgb, var(--learn-brand-pale) 76%, transparent);
}

.learn-hero::after {
  right: -70px;
  bottom: -100px;
  width: 260px;
  height: 260px;
  border: 48px solid color-mix(in srgb, var(--learn-gold) 14%, transparent);
}

.learn-eyebrow {
  margin: 0 0 8px;
  color: var(--learn-brand-deep);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.15em;
}

.learn-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4.75rem);
  font-weight: 850;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.learn-hero-copy > p:last-child {
  max-width: 780px;
  margin: 22px 0 0;
  color: var(--learn-muted);
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
}

.learn-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 9px;
  margin: 0;
}

.learn-hero-stats div {
  min-height: 108px;
  padding: 17px 15px;
  border: 1px solid color-mix(in srgb, var(--learn-line) 86%, transparent);
  border-radius: 18px;
  background: color-mix(in srgb, var(--learn-surface) 87%, transparent);
  box-shadow: var(--learn-shadow-soft);
}

.learn-hero-stats dt {
  color: var(--learn-muted);
  font-size: 0.69rem;
  font-weight: 800;
  line-height: 1.25;
}

.learn-hero-stats dd {
  margin: 8px 0 0;
  color: var(--learn-brand-deep);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1;
}

.learn-categories {
  padding: 50px 0 24px;
}

.learn-section-intro {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.learn-section-intro h2,
.learn-level-heading h2,
.learn-level-overview h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.learn-audio-settings {
  display: flex;
  align-items: end;
  gap: 9px;
  padding: 9px;
  border: 1px solid var(--learn-line);
  border-radius: 15px;
  background: var(--learn-surface);
}

.learn-audio-settings .learn-icon-button {
  min-height: 48px;
}

.learn-icon-button[aria-pressed="false"] {
  color: var(--learn-muted);
  background: var(--learn-surface-soft);
}

.learn-tablist {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.learn-tab {
  position: relative;
  display: flex;
  min-height: 108px;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  overflow: hidden;
  border: 1px solid var(--learn-line);
  border-radius: 20px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  text-align: left;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.learn-tab::after {
  position: absolute;
  inset: auto 0 0;
  height: 4px;
  background: var(--tab-color);
  content: "";
  opacity: 0;
  transform: scaleX(0.35);
  transition: opacity 180ms ease, transform 180ms ease;
}

.learn-tab:hover {
  border-color: color-mix(in srgb, var(--tab-color) 62%, var(--learn-line));
  box-shadow: var(--learn-shadow-soft);
  transform: translateY(-2px);
}

.learn-tab[aria-selected="true"] {
  border-color: color-mix(in srgb, var(--tab-color) 70%, var(--learn-line));
  background: var(--tab-soft);
  box-shadow: var(--learn-shadow-soft);
}

.learn-tab[aria-selected="true"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.learn-tab-words {
  --tab-color: var(--learn-words);
  --tab-soft: var(--learn-words-soft);
}

.learn-tab-phrases {
  --tab-color: var(--learn-phrases);
  --tab-soft: var(--learn-phrases-soft);
}

.learn-tab-phonics {
  --tab-color: var(--learn-phonics);
  --tab-soft: var(--learn-phonics-soft);
}

.learn-tab-icon {
  display: grid;
  width: 56px;
  height: 56px;
  flex: 0 0 56px;
  place-items: center;
  border-radius: 17px;
  background: color-mix(in srgb, var(--tab-color) 13%, var(--learn-surface));
  font-size: 1.75rem;
}

.learn-tab span:not(.learn-tab-icon),
.learn-tab strong,
.learn-tab small {
  display: block;
}

.learn-tab strong {
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}

.learn-tab small {
  margin-top: 3px;
  color: var(--learn-muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.learn-library {
  display: grid;
  grid-template-columns: 276px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.learn-level-panel,
.learn-content-panel {
  min-width: 0;
  border: 1px solid var(--learn-line);
  border-radius: var(--learn-radius-lg);
  background: var(--learn-surface);
  box-shadow: var(--learn-shadow-soft);
}

.learn-level-panel {
  position: sticky;
  top: 94px;
  padding: 20px;
}

.learn-level-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.learn-level-heading h2 {
  font-size: 1.35rem;
}

.learn-level-count {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 5px 9px;
  border-radius: 999px;
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
  font-size: 0.69rem;
  font-weight: 900;
  white-space: nowrap;
}

.learn-level-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 7px;
}

.learn-level-button {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 46px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--learn-line);
  border-radius: 11px;
  color: var(--learn-ink);
  background: var(--learn-surface-soft);
  font-size: 0.78rem;
  font-weight: 900;
  cursor: pointer;
}

.learn-level-button::after {
  position: absolute;
  inset: auto 0 0;
  height: 3px;
  background: var(--level-progress-color, transparent);
  content: "";
  transform: scaleX(var(--level-progress, 0));
  transform-origin: left;
}

.learn-level-button:hover:not(:disabled) {
  border-color: var(--learn-brand);
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
}

.learn-level-button[aria-current="true"] {
  border-color: var(--learn-brand);
  color: white;
  background: var(--learn-brand-deep);
  box-shadow: 0 7px 16px color-mix(in srgb, var(--learn-brand) 25%, transparent);
}

html[data-theme="dark"] .learn-level-button[aria-current="true"] {
  color: #062725;
  background: var(--learn-brand);
}

.learn-level-button.is-complete {
  --level-progress-color: var(--learn-brand);
}

.learn-level-button.is-started:not([aria-current="true"]) {
  border-color: color-mix(in srgb, var(--learn-gold) 58%, var(--learn-line));
  background: color-mix(in srgb, var(--learn-gold) 10%, var(--learn-surface));
}

.learn-level-button:disabled {
  color: color-mix(in srgb, var(--learn-muted) 72%, transparent);
  background: color-mix(in srgb, var(--learn-surface-soft) 65%, transparent);
  cursor: not-allowed;
}

.learn-level-button .lock-mark {
  position: absolute;
  top: 2px;
  right: 3px;
  font-size: 0.52rem;
  line-height: 1;
}

.learn-level-legend {
  display: grid;
  gap: 7px;
  margin-top: 17px;
  color: var(--learn-muted);
  font-size: 0.68rem;
  font-weight: 750;
}

.learn-level-legend > span {
  display: flex;
  align-items: center;
  gap: 7px;
}

.learn-level-legend i {
  width: 9px;
  height: 9px;
  border: 1px solid var(--learn-line);
  border-radius: 50%;
  background: var(--learn-surface-soft);
}

.learn-level-legend .is-open {
  border-color: var(--learn-brand);
  background: var(--learn-brand);
}

.learn-level-legend .is-progress {
  border-color: var(--learn-gold);
  background: var(--learn-gold);
}

.learn-level-legend .is-locked {
  background: var(--learn-line);
}

.learn-private-note {
  display: flex;
  gap: 8px;
  margin: 17px 0 0;
  padding: 12px;
  border-radius: 12px;
  color: var(--learn-muted);
  background: var(--learn-surface-soft);
  font-size: 0.7rem;
  font-weight: 650;
}

.learn-content-panel {
  padding: clamp(18px, 2.5vw, 30px);
}

.learn-level-overview {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  min-height: 150px;
  padding: clamp(18px, 2.5vw, 28px);
  border: 1px solid color-mix(in srgb, var(--category-accent, var(--learn-brand)) 28%, var(--learn-line));
  border-radius: 20px;
  background:
    linear-gradient(115deg, var(--category-soft, var(--learn-brand-pale)), color-mix(in srgb, var(--learn-surface) 95%, transparent));
}

.learn-level-symbol {
  display: grid;
  width: 72px;
  height: 72px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--category-accent, var(--learn-brand)) 28%, transparent);
  border-radius: 22px;
  background: var(--learn-surface);
  box-shadow: var(--learn-shadow-soft);
  font-size: 2.1rem;
}

.learn-level-copy > p:not(.learn-eyebrow) {
  margin: 7px 0 0;
  color: var(--learn-muted);
  font-size: 0.88rem;
}

.learn-progress-row {
  display: grid;
  grid-template-columns: minmax(120px, 310px) auto;
  gap: 10px;
  align-items: center;
  margin-top: 14px;
}

.learn-progress-track,
.learn-review-meter {
  overflow: hidden;
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--learn-line) 74%, transparent);
}

.learn-progress-track span,
.learn-review-meter span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--category-accent, var(--learn-brand));
  transition: width 260ms ease;
}

.learn-progress-row strong {
  color: var(--learn-muted);
  font-size: 0.76rem;
}

.learn-review-button {
  display: flex;
  min-width: 184px;
  min-height: 62px;
  align-items: center;
  justify-content: center;
  gap: 11px;
  padding: 11px 16px;
  border: 0;
  border-radius: 15px;
  color: #fff;
  background: var(--category-accent, var(--learn-brand-deep));
  box-shadow: 0 10px 22px color-mix(in srgb, var(--category-accent, var(--learn-brand)) 24%, transparent);
  text-align: left;
  cursor: pointer;
}

.learn-review-button > span:first-child {
  font-size: 1.35rem;
}

.learn-review-button strong,
.learn-review-button small {
  display: block;
}

.learn-review-button strong {
  font-size: 0.82rem;
}

.learn-review-button small {
  margin-top: 2px;
  opacity: 0.82;
  font-size: 0.65rem;
  font-weight: 700;
}

.learn-review-button:hover:not(:disabled) {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.learn-review-button:disabled {
  color: var(--learn-muted);
  background: var(--learn-line);
  box-shadow: none;
  cursor: not-allowed;
}

.learn-toolbar {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) auto auto;
  gap: 12px;
  align-items: center;
  padding: 20px 0;
}

.learn-search {
  display: flex;
  min-width: 0;
  height: 46px;
  align-items: center;
  gap: 8px;
  padding: 0 13px;
  border: 1px solid var(--learn-line);
  border-radius: 13px;
  background: var(--learn-surface-soft);
}

.learn-search > span:not(.sr-only) {
  color: var(--learn-muted);
  font-size: 1.2rem;
}

.learn-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  color: var(--learn-ink);
  background: transparent;
  font-size: 0.84rem;
}

.learn-search input::placeholder {
  color: var(--learn-muted);
}

.learn-filters {
  display: flex;
  gap: 6px;
}

.learn-filters button,
.learn-rating-button,
.learn-reveal-button,
.learn-next-button {
  min-height: 42px;
  padding: 8px 12px;
  border: 1px solid var(--learn-line);
  border-radius: 11px;
  color: var(--learn-muted);
  background: var(--learn-surface);
  font-size: 0.72rem;
  font-weight: 850;
  cursor: pointer;
}

.learn-filters button:hover,
.learn-filters button.is-active {
  border-color: var(--learn-brand);
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
}

.learn-result-count {
  margin: 0;
  color: var(--learn-muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-align: right;
  white-space: nowrap;
}

.learn-state {
  display: grid;
  min-height: 330px;
  place-items: center;
  align-content: center;
  padding: 36px;
  border: 1px dashed var(--learn-line);
  border-radius: 18px;
  color: var(--learn-muted);
  background: var(--learn-surface-soft);
  text-align: center;
}

.learn-state-icon {
  display: grid;
  width: 70px;
  height: 70px;
  place-items: center;
  margin-bottom: 12px;
  border-radius: 22px;
  background: var(--learn-surface);
  box-shadow: var(--learn-shadow-soft);
  font-size: 2rem;
}

.learn-state h2 {
  margin: 0;
  color: var(--learn-ink);
  font-size: 1.2rem;
}

.learn-state p {
  max-width: 520px;
  margin: 7px 0 0;
  font-size: 0.84rem;
}

.learn-state button,
.learn-state a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  margin-top: 17px;
  padding: 9px 15px;
  border: 1px solid var(--learn-brand);
  border-radius: 12px;
  color: #fff;
  background: var(--learn-brand-deep);
  font-size: 0.78rem;
  font-weight: 850;
  text-decoration: none;
  cursor: pointer;
}

.learn-loader {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
}

.learn-loader span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--learn-brand);
  animation: learn-pulse 1s ease-in-out infinite;
}

.learn-loader span:nth-child(2) {
  animation-delay: 120ms;
}

.learn-loader span:nth-child(3) {
  animation-delay: 240ms;
}

@keyframes learn-pulse {
  0%, 100% { opacity: 0.3; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-5px); }
}

.learn-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.learn-card {
  --card-accent: var(--learn-brand);
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--learn-line);
  border-radius: 19px;
  background: var(--learn-surface);
  box-shadow: 0 6px 20px rgba(18, 52, 63, 0.055);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.learn-card:hover {
  border-color: color-mix(in srgb, var(--card-accent) 45%, var(--learn-line));
  box-shadow: var(--learn-shadow-soft);
  transform: translateY(-2px);
}

.learn-card[data-category="words"] { --card-accent: var(--learn-words); }
.learn-card[data-category="phrases"] { --card-accent: var(--learn-phrases); }
.learn-card[data-category="phonics"] { --card-accent: var(--learn-phonics); }

.learn-card::before {
  display: block;
  width: 100%;
  height: 4px;
  background: var(--card-accent);
  content: "";
}

.learn-card-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 18px 18px 14px;
}

.learn-card-icon {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 15px;
  background: color-mix(in srgb, var(--card-accent) 12%, var(--learn-surface));
  font-size: 1.6rem;
}

.learn-card-title {
  min-width: 0;
}

.learn-card-title small {
  display: block;
  overflow: hidden;
  margin-bottom: 3px;
  color: var(--card-accent);
  font-size: 0.66rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.learn-card-title h3 {
  overflow-wrap: anywhere;
  margin: 0;
  font-size: 1.23rem;
  letter-spacing: -0.025em;
  line-height: 1.22;
}

.learn-card-title .learn-card-ja {
  margin: 4px 0 0;
  color: var(--learn-muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.learn-favorite-button {
  display: grid;
  width: 43px;
  height: 43px;
  place-items: center;
  border: 1px solid var(--learn-line);
  border-radius: 13px;
  color: var(--learn-muted);
  background: var(--learn-surface-soft);
  font-size: 1.1rem;
  cursor: pointer;
}

.learn-favorite-button:hover,
.learn-favorite-button[aria-pressed="true"] {
  border-color: color-mix(in srgb, #d65e75 55%, var(--learn-line));
  color: #d84f6c;
  background: color-mix(in srgb, #ef8195 12%, var(--learn-surface));
}

.learn-favorite-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.learn-card-body {
  display: grid;
  gap: 10px;
  padding: 0 18px 16px;
}

.learn-detail {
  padding: 11px 12px;
  border-radius: 12px;
  background: var(--learn-surface-soft);
}

.learn-detail dt {
  margin: 0 0 3px;
  color: var(--learn-muted);
  font-size: 0.64rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.learn-detail dd {
  margin: 0;
  color: var(--learn-ink);
  font-size: 0.79rem;
}

.learn-detail dd + dd {
  margin-top: 3px;
  color: var(--learn-muted);
  font-size: 0.73rem;
}

.learn-detail.is-mistake {
  border-left: 3px solid var(--learn-gold);
  background: color-mix(in srgb, var(--learn-gold) 9%, var(--learn-surface));
}

.learn-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-chip-list li,
.learn-status-pill,
.learn-plan-pill {
  display: inline-flex;
  min-height: 25px;
  align-items: center;
  padding: 4px 8px;
  border: 1px solid var(--learn-line);
  border-radius: 999px;
  color: var(--learn-muted);
  background: var(--learn-surface);
  font-size: 0.63rem;
  font-weight: 800;
}

.learn-audio-block {
  padding: 12px 18px;
  border-top: 1px solid var(--learn-line);
  border-bottom: 1px solid var(--learn-line);
  background: color-mix(in srgb, var(--card-accent) 5%, var(--learn-surface));
}

.learn-audio-sample {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  margin-bottom: 9px;
  color: var(--learn-muted);
  font-size: 0.66rem;
  font-weight: 800;
}

.learn-audio-sample select {
  min-width: 0;
  min-height: 34px;
  padding: 5px 30px 5px 9px;
  border: 1px solid var(--learn-line);
  border-radius: 9px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  font: inherit;
}

.learn-audio-buttons {
  display: flex;
  gap: 7px;
}

.learn-audio-button {
  display: inline-flex;
  min-height: 42px;
  flex: 1 1 0;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 10px;
  border: 1px solid color-mix(in srgb, var(--card-accent) 32%, var(--learn-line));
  border-radius: 11px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  font-size: 0.72rem;
  font-weight: 850;
  cursor: pointer;
}

.learn-audio-button:hover {
  border-color: var(--card-accent);
  color: var(--card-accent);
}

.learn-audio-button:disabled {
  opacity: 0.56;
  cursor: wait;
}

.learn-audio-button[aria-busy="true"] {
  opacity: 1;
  border-color: var(--card-accent);
  color: var(--card-accent);
  background: color-mix(in srgb, var(--card-accent) 10%, var(--learn-surface));
}

.learn-audio-glyph {
  display: inline-flex;
  width: 22px;
  height: 18px;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.learn-audio-glyph i {
  width: 3px;
  height: 7px;
  border-radius: 999px;
  background: currentColor;
}

.learn-audio-glyph i:nth-child(2) {
  height: 13px;
}

.learn-audio-button[aria-busy="true"] .learn-audio-glyph i {
  animation: learn-audio-wave 0.72s ease-in-out infinite alternate;
}

.learn-audio-button[aria-busy="true"] .learn-audio-glyph i:nth-child(2) {
  animation-delay: -0.28s;
}

.learn-audio-button[aria-busy="true"] .learn-audio-glyph i:nth-child(3) {
  animation-delay: -0.48s;
}

@keyframes learn-audio-wave {
  from { transform: scaleY(0.45); }
  to { transform: scaleY(1.15); }
}

.learn-audio-status {
  min-height: 18px;
  margin: 7px 0 0;
  color: var(--learn-muted);
  font-size: 0.67rem;
  font-weight: 700;
}

.learn-audio-status[data-phase="loading"] {
  color: var(--learn-brand-deep);
}

.learn-audio-status[data-phase="playing"] {
  color: var(--card-accent);
}

.learn-audio-status[data-phase="error"] {
  color: var(--learn-red);
}

.learn-card-progress {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 9px;
  margin-top: auto;
  padding: 13px 18px 17px;
}

.learn-status-pill[data-status="learning"] {
  border-color: color-mix(in srgb, var(--learn-gold) 52%, var(--learn-line));
  color: color-mix(in srgb, var(--learn-gold) 68%, var(--learn-ink));
  background: color-mix(in srgb, var(--learn-gold) 9%, var(--learn-surface));
}

.learn-status-pill[data-status="reviewed"],
.learn-status-pill[data-status="mastered"] {
  border-color: color-mix(in srgb, var(--learn-brand) 42%, var(--learn-line));
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
}

.learn-card-rating {
  display: flex;
  gap: 5px;
}

.learn-card-rating button {
  min-height: 35px;
  padding: 6px 9px;
  border: 1px solid var(--learn-line);
  border-radius: 9px;
  color: var(--learn-muted);
  background: var(--learn-surface);
  font-size: 0.63rem;
  font-weight: 850;
  cursor: pointer;
}

.learn-card-rating button:hover,
.learn-card-rating button[aria-pressed="true"] {
  border-color: var(--learn-brand);
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
}

.learn-card-rating button:disabled {
  opacity: 0.52;
  cursor: wait;
}

.learn-review-dialog {
  width: min(720px, calc(100vw - 32px));
  max-height: min(860px, calc(100vh - 32px));
  padding: 0;
  overflow: auto;
  border: 1px solid var(--learn-line);
  border-radius: 25px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  box-shadow: 0 35px 100px rgba(5, 30, 36, 0.32);
}

.learn-review-dialog::backdrop {
  background: rgba(5, 26, 34, 0.62);
  backdrop-filter: blur(5px);
}

.learn-review-shell {
  padding: clamp(20px, 4vw, 34px);
}

.learn-review-header,
.learn-review-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.learn-review-header h2 {
  margin: 0;
  font-size: 1.65rem;
  letter-spacing: -0.04em;
}

.learn-dialog-close {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid var(--learn-line);
  border-radius: 13px;
  color: var(--learn-muted);
  background: var(--learn-surface-soft);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}

.learn-review-meter {
  height: 6px;
  margin: 20px 0 13px;
}

.learn-review-meta {
  color: var(--learn-muted);
  font-size: 0.72rem;
  font-weight: 850;
}

.learn-review-meta label {
  display: flex;
  align-items: center;
  gap: 7px;
}

.learn-review-card {
  display: grid;
  min-height: 410px;
  align-content: center;
  margin-top: 18px;
  padding: clamp(24px, 6vw, 50px);
  border: 1px solid color-mix(in srgb, var(--category-accent, var(--learn-brand)) 35%, var(--learn-line));
  border-radius: 22px;
  background:
    radial-gradient(circle at 90% 8%, color-mix(in srgb, var(--category-accent, var(--learn-brand)) 12%, transparent), transparent 14rem),
    var(--learn-surface-soft);
  text-align: center;
}

.learn-review-prompt-label {
  margin: 0 0 9px;
  color: var(--category-accent, var(--learn-brand));
  font-size: 0.69rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.learn-review-prompt {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: clamp(1.65rem, 5vw, 3rem);
  font-weight: 850;
  letter-spacing: -0.045em;
  line-height: 1.12;
}

.learn-review-subprompt {
  margin: 10px 0 0;
  color: var(--learn-muted);
  font-size: 0.87rem;
}

.learn-review-audio {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 18px;
}

.learn-review-audio .learn-audio-button {
  flex: 0 1 150px;
}

.learn-choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  width: 100%;
  margin-top: 22px;
  text-align: left;
}

.learn-choice-button {
  display: flex;
  min-height: 58px;
  align-items: center;
  gap: 11px;
  padding: 11px 13px;
  border: 1px solid var(--learn-line);
  border-radius: 13px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
}

.learn-choice-button:hover:not(:disabled),
.learn-choice-button:focus-visible {
  border-color: var(--category-accent, var(--learn-brand));
  background: color-mix(in srgb, var(--category-accent, var(--learn-brand)) 8%, var(--learn-surface));
}

.learn-choice-button:disabled {
  cursor: default;
  opacity: 0.72;
}

.learn-choice-button[data-result="correct"] {
  border-color: var(--learn-brand);
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
  opacity: 1;
  animation: learn-answer-success 420ms cubic-bezier(0.2, 0.85, 0.3, 1);
}

.learn-choice-button[data-result="wrong"] {
  border-color: color-mix(in srgb, var(--learn-red) 68%, var(--learn-line));
  color: var(--learn-red);
  background: color-mix(in srgb, var(--learn-red) 8%, var(--learn-surface));
  opacity: 1;
}

.learn-choice-number {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 9px;
  font-size: 0.68rem;
  font-weight: 900;
}

.learn-choice-feedback {
  margin: 14px 0 0;
  padding: 11px 13px;
  border: 1px solid var(--learn-line);
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 800;
}

.learn-choice-feedback.is-correct {
  border-color: color-mix(in srgb, var(--learn-brand) 55%, var(--learn-line));
  color: var(--learn-brand-deep);
  background: var(--learn-brand-pale);
  animation: learn-answer-success 420ms cubic-bezier(0.2, 0.85, 0.3, 1);
}

@keyframes learn-answer-success {
  0% {
    opacity: 0;
    transform: translateY(5px) scale(0.985);
  }
  58% {
    transform: translateY(-1px) scale(1.012);
  }
  100% {
    opacity: 1;
    transform: none;
  }
}

.learn-choice-feedback.is-wrong {
  border-color: color-mix(in srgb, var(--learn-red) 55%, var(--learn-line));
  color: var(--learn-red);
  background: color-mix(in srgb, var(--learn-red) 7%, var(--learn-surface));
}

.learn-review-choice-help {
  margin: 0;
  color: var(--learn-muted);
  font-size: 0.75rem;
  font-weight: 750;
}

.learn-review-answer {
  display: grid;
  gap: 8px;
  margin-top: 23px;
  padding-top: 22px;
  border-top: 1px solid var(--learn-line);
}

.learn-review-answer[hidden],
.learn-review-rating[hidden] {
  display: none;
}

.learn-review-answer strong {
  font-size: 1.35rem;
  letter-spacing: -0.025em;
}

.learn-review-answer p {
  margin: 0;
  color: var(--learn-muted);
  font-size: 0.82rem;
}

.learn-review-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}

.learn-reveal-button,
.learn-next-button {
  min-width: 170px;
  border-color: var(--category-accent, var(--learn-brand));
  color: #fff;
  background: var(--category-accent, var(--learn-brand-deep));
}

.learn-review-rating {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  width: 100%;
}

.learn-rating-button {
  display: grid;
  min-height: 54px;
  place-items: center;
  color: var(--learn-ink);
  text-align: center;
}

.learn-rating-button small {
  display: block;
  color: var(--learn-muted);
  font-size: 0.61rem;
}

.learn-rating-button:hover {
  border-color: var(--category-accent, var(--learn-brand));
  color: var(--category-accent, var(--learn-brand));
}

.learn-key-hint {
  margin: 14px 0 0;
  color: var(--learn-muted);
  font-size: 0.65rem;
  font-weight: 700;
  text-align: center;
}

.learn-toast {
  position: fixed;
  z-index: 100;
  right: 20px;
  bottom: max(20px, env(safe-area-inset-bottom));
  max-width: min(380px, calc(100vw - 40px));
  padding: 13px 16px;
  border: 1px solid color-mix(in srgb, var(--learn-brand) 42%, var(--learn-line));
  border-radius: 14px;
  color: var(--learn-ink);
  background: var(--learn-surface);
  box-shadow: var(--learn-shadow);
  font-size: 0.8rem;
  font-weight: 750;
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.learn-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.learn-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px max(22px, calc((100vw - 1440px) / 2));
  border-top: 1px solid var(--learn-line);
  color: var(--learn-muted);
  background: var(--learn-surface);
  font-size: 0.75rem;
}

.learn-footer p,
.learn-footer strong,
.learn-footer span {
  display: block;
  margin: 0;
}

.learn-footer strong {
  color: var(--learn-ink);
}

.learn-footer a {
  color: var(--learn-brand-deep);
  font-weight: 850;
}

.access-boundary {
  width: min(850px, calc(100% - 36px));
  margin: 70px auto;
}

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

body[data-language="en"] .learn-card-ja,
body[data-language="en"] [data-content-ja] {
  display: none;
}

@media (max-width: 1120px) {
  .learn-header {
    position: relative;
  }

  .learn-hero {
    grid-template-columns: 1fr;
  }

  .learn-hero-stats {
    max-width: 680px;
  }

  .learn-library {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .learn-level-grid {
    grid-template-columns: repeat(4, minmax(42px, 1fr));
  }

  .learn-level-panel {
    top: 18px;
  }

  .learn-level-overview {
    grid-template-columns: 58px minmax(0, 1fr);
  }

  .learn-level-symbol {
    width: 58px;
    height: 58px;
    border-radius: 18px;
    font-size: 1.7rem;
  }

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

  .learn-toolbar {
    grid-template-columns: 1fr;
  }

  .learn-result-count {
    text-align: left;
  }

  .learn-card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .learn-header {
    align-items: flex-start;
    gap: 10px;
    padding-inline: 18px;
  }

  .learn-header-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .learn-home-link {
    order: 3;
  }

  #learnApp {
    width: min(100% - 28px, 760px);
    padding-top: 18px;
  }

  .learn-hero {
    padding: 30px 24px;
    border-radius: 24px;
  }

  .learn-section-intro {
    align-items: stretch;
    flex-direction: column;
  }

  .learn-audio-settings {
    align-self: flex-start;
  }

  .learn-tablist {
    grid-template-columns: 1fr;
  }

  .learn-tab {
    min-height: 86px;
  }

  .learn-library {
    grid-template-columns: 1fr;
  }

  .learn-level-panel {
    position: static;
    overflow: hidden;
  }

  .learn-level-grid {
    grid-auto-columns: 46px;
    grid-auto-flow: column;
    grid-template-columns: none;
    grid-template-rows: repeat(2, 46px);
    gap: 7px;
    padding: 2px 2px 10px;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
    scroll-snap-type: x proximity;
  }

  .learn-level-button {
    width: 46px;
    scroll-snap-align: start;
  }

  .learn-level-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
  }
}

@media (max-width: 620px) {
  .learn-header {
    display: grid;
    grid-template-columns: 1fr;
  }

  .learn-header-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .learn-home-link {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .learn-compact-select select {
    width: 100%;
  }

  .learn-brand strong {
    font-size: 0.9rem;
  }

  .learn-brand small {
    font-size: 0.68rem;
  }

  .learn-hero h1 {
    font-size: clamp(2.1rem, 12vw, 3.4rem);
  }

  .learn-hero-stats {
    grid-template-columns: 1fr;
  }

  .learn-hero-stats div {
    display: flex;
    min-height: 70px;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
  }

  .learn-hero-stats dd {
    margin: 0;
  }

  .learn-categories {
    padding-top: 36px;
  }

  .learn-audio-settings {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .learn-audio-settings .learn-icon-button {
    grid-column: 1 / -1;
  }

  .learn-audio-settings select {
    width: 100%;
  }

  .learn-content-panel,
  .learn-level-panel {
    padding: 14px;
    border-radius: 18px;
  }

  .learn-level-overview {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .learn-level-symbol {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    font-size: 1.45rem;
  }

  .learn-level-copy > p:not(.learn-eyebrow) {
    font-size: 0.78rem;
  }

  .learn-progress-row {
    grid-template-columns: 1fr auto;
  }

  .learn-filters {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .learn-filters button {
    min-height: 44px;
  }

  .learn-card-head {
    padding-inline: 14px;
  }

  .learn-card-body {
    padding-inline: 14px;
  }

  .learn-audio-block,
  .learn-card-progress {
    padding-inline: 14px;
  }

  .learn-card-progress {
    align-items: stretch;
    flex-direction: column;
  }

  .learn-card-rating {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .learn-card-rating button {
    min-height: 42px;
  }

  .learn-review-dialog {
    width: calc(100vw - 18px);
    max-height: calc(100vh - 18px);
    border-radius: 20px;
  }

  .learn-review-shell {
    padding: 18px;
  }

  .learn-review-meta {
    align-items: stretch;
    flex-direction: column;
  }

  .learn-review-meta label {
    justify-content: space-between;
  }

  .learn-review-card {
    min-height: 380px;
    padding: 26px 18px;
  }

  .learn-review-rating {
    grid-template-columns: 1fr;
  }

  .learn-choice-grid {
    grid-template-columns: 1fr;
  }

  .learn-key-hint {
    display: none;
  }

  .learn-footer {
    align-items: flex-start;
    flex-direction: column;
    padding-inline: 18px;
  }
}

@media (max-width: 390px) {
  #learnApp {
    width: calc(100% - 20px);
  }

  .learn-header {
    padding-inline: 12px;
  }

  .learn-hero {
    padding: 26px 18px;
  }

  .learn-tab {
    padding: 14px;
  }

  .learn-tab-icon {
    width: 48px;
    height: 48px;
    flex-basis: 48px;
    border-radius: 14px;
  }

  .learn-audio-buttons {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .learn-page *,
  .learn-page *::before,
  .learn-page *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}