:root {
  color-scheme: light dark;
  --background: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --text: #172033;
  --muted: #667085;
  --border: #dfe5ef;
  --primary: #2256d8;
  --primary-hover: #1745b5;
  --primary-text: #ffffff;
  --accent: #e8efff;
  --success: #087e65;
  --danger: #c73737;
  --shadow: 0 12px 30px rgb(32 55 94 / 10%);
  --radius: 20px;
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--background);
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  background:
    radial-gradient(circle at top right, rgb(69 121 255 / 10%), transparent 36%),
    var(--background);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button {
  touch-action: manipulation;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid #75a0ff;
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

[hidden] {
  display: none !important;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: max(8px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 8px max(16px, env(safe-area-inset-left));
  border-bottom: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
  background: color-mix(in srgb, var(--background) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.brand-button,
.header-button,
.text-button {
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.brand-button {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 4px;
  gap: 10px;
  font-weight: 750;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 11px;
  background: var(--primary);
  color: #fff;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
}

.header-button {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 8px 10px;
  gap: 7px;
  border-radius: 12px;
}

.header-button:hover,
.text-button:hover {
  background: var(--accent);
}

.app-shell {
  width: min(100% - 32px, 720px);
  margin: 0 auto;
  padding: 28px 0 calc(40px + env(safe-area-inset-bottom));
  outline: 0;
}

.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero {
  padding: 28px 22px 22px;
}

.hero h1,
.page-heading h1,
.error-panel h1 {
  margin: 4px 0 18px;
  font-size: clamp(1.55rem, 6vw, 2.25rem);
  line-height: 1.35;
  letter-spacing: -0.035em;
}

.eyebrow {
  margin: 0;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.session-summary {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  align-items: center;
  margin: 24px 0;
  padding: 18px;
  border-radius: 16px;
  background: var(--surface-soft);
}

.summary-item {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  color: var(--muted);
}

.summary-number {
  color: var(--text);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.summary-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

.primary-button,
.secondary-button {
  min-height: 52px;
  padding: 12px 18px;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 750;
  transition: transform 120ms ease, background 120ms ease;
}

.primary-button {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: var(--primary-text);
}

.primary-button:not(:disabled):hover {
  background: var(--primary-hover);
}

.secondary-button {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.secondary-button:not(:disabled):hover {
  border-color: var(--primary);
  color: var(--primary);
}

.primary-button:not(:disabled):active,
.secondary-button:not(:disabled):active,
.round-audio-button:not(:disabled):active {
  transform: scale(0.98);
}

.full-width {
  width: 100%;
}

.progress-panel,
.analytics-panel {
  margin-top: 18px;
  padding: 22px;
}

.section-heading-row,
.word-heading-row,
.sentence-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.section-heading-row h2,
.settings-group h2 {
  margin: 2px 0 0;
  font-size: 1.15rem;
}

.section-heading-row strong {
  color: var(--primary);
  font-size: 1.4rem;
}

.progress-track,
.card-progress {
  overflow: hidden;
  height: 9px;
  border-radius: 999px;
  background: var(--border);
}

.progress-track {
  margin: 18px 0 10px;
}

.progress-track span,
.card-progress span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #5e8dff);
}

.progress-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 16px;
  color: var(--muted);
  font-size: 0.86rem;
}

.analytics-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.analytics-metric {
  display: grid;
  min-width: 0;
  padding: 14px;
  border-radius: 12px;
  background: var(--surface-soft);
}

.analytics-metric strong {
  font-size: 1.45rem;
  line-height: 1.2;
}

.analytics-metric span {
  font-weight: 750;
}

.analytics-metric small,
.empty-stats {
  color: var(--muted);
  font-size: 0.78rem;
}

.analytics-subsection {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.analytics-subsection h3 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.flagged-list {
  display: grid;
  margin: 0;
  padding-left: 24px;
  gap: 7px;
}

.flagged-list li {
  padding-left: 4px;
}

.flagged-list li::marker {
  color: var(--muted);
  font-weight: 750;
}

.flagged-list strong {
  overflow-wrap: anywhere;
}

.flagged-list span {
  float: right;
  margin-left: 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

.empty-stats {
  margin: 0;
}

.card-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.text-button {
  min-height: 44px;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--primary);
  font-weight: 700;
}

.card-progress {
  height: 5px;
  margin-bottom: 18px;
}

.word-card {
  padding: 24px 22px;
}

.pos-badge,
.domain-label,
.sentence-label,
.scene-label {
  font-size: 0.74rem;
  font-weight: 800;
}

.pos-badge {
  display: inline-flex;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--primary);
}

.word-card h1 {
  margin: 4px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.25rem, 12vw, 3.8rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.round-audio-button {
  display: grid;
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-size: 1.05rem;
}

.word-ja {
  margin: 20px 0 5px;
  font-size: 1.28rem;
  font-weight: 750;
}

.definition {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 1.02rem;
}

.queue-button {
  margin-top: 20px;
}

.sentence-list {
  display: grid;
  margin-top: 16px;
  gap: 14px;
}

.sentence-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
}

.sentence-label {
  color: var(--primary);
  letter-spacing: 0.08em;
}

.domain-label {
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
}

.sentence-en {
  margin: 14px 0 5px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.55;
}

.sentence-ja {
  margin: 0;
  color: var(--muted);
}

.scene {
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 3px solid var(--primary);
  border-radius: 0 10px 10px 0;
  background: var(--surface-soft);
}

.scene-label {
  color: var(--primary);
}

.scene p {
  margin: 2px 0 0;
  font-size: 0.88rem;
}

.audio-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 16px;
  gap: 10px;
}

.card-navigation {
  position: sticky;
  bottom: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  margin: 20px -8px 0;
  padding: 12px 8px max(12px, env(safe-area-inset-bottom));
  gap: 10px;
  background: color-mix(in srgb, var(--background) 90%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.audio-hint {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

.debug-date-notice {
  display: inline-flex;
  margin: 10px 0 0;
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
  font-size: 0.78rem;
  font-weight: 800;
}

.mode-instruction {
  display: grid;
  margin-bottom: 16px;
  padding: 14px 16px;
  gap: 2px;
  border-left: 4px solid var(--primary);
  border-radius: 0 12px 12px 0;
  background: var(--surface-soft);
}

.mode-instruction span {
  color: var(--muted);
  font-size: 0.88rem;
}

.intro-actions,
.evaluation-actions {
  position: sticky;
  bottom: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  margin: 20px -8px 0;
  padding: 12px 8px max(12px, env(safe-area-inset-bottom));
  gap: 10px;
  background: color-mix(in srgb, var(--background) 90%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.recall-cue {
  min-height: 270px;
  padding: 34px 26px;
  text-align: center;
}

.recall-cue h1 {
  margin: 26px 0 4px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.2rem, 11vw, 4rem);
  line-height: 1.2;
}

.cue-label {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.cue-pos {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.cue-sentence-ja,
.cue-scene {
  margin: 28px auto 0;
  font-size: clamp(1.15rem, 5vw, 1.55rem);
  font-weight: 700;
  line-height: 1.7;
}

.cue-scene {
  max-width: 34rem;
}

.reveal-button {
  position: sticky;
  bottom: max(12px, env(safe-area-inset-bottom));
  margin-top: 20px;
  box-shadow: 0 8px 22px rgb(23 32 51 / 18%);
}

.answer-panel {
  margin-top: 16px;
  padding: 26px 22px;
}

.answer-panel h2 {
  margin: 8px 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.45rem, 6vw, 2rem);
  line-height: 1.5;
}

.answer-ja {
  margin: 0;
  color: var(--muted);
}

.answer-word {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.answer-tools-slot {
  min-height: 1px;
  margin-top: 14px;
}

.asr-tool {
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.asr-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.asr-heading-row p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.asr-start-button {
  flex: 0 0 auto;
  min-height: 46px;
  padding: 9px 13px;
}

.asr-start-button > span:first-child {
  color: var(--danger);
  font-size: 0.72rem;
}

.asr-listening-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--danger);
  animation: asr-pulse 900ms ease-in-out infinite alternate;
}

.asr-status,
.asr-unavailable {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.recorder-tool {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.recorder-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.recorder-heading-row p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.recorder-toggle-button {
  flex: 0 0 auto;
  min-height: 46px;
  padding: 9px 13px;
}

.recorder-toggle-button > span:first-child {
  color: var(--danger);
  font-size: 0.72rem;
}

.recorder-status,
.recorder-unavailable {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.recorder-playback-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.recorder-playback-actions[hidden] {
  display: none;
}

.asr-result {
  margin-top: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
}

.asr-result.is-match {
  border-color: color-mix(in srgb, var(--success) 45%, var(--border));
}

.asr-result.is-mismatch {
  border-color: color-mix(in srgb, var(--danger) 40%, var(--border));
}

.asr-result-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.asr-result-heading strong,
.asr-keyword.is-match {
  color: var(--success);
}

.asr-result.is-mismatch .asr-result-heading strong,
.asr-keyword.is-mismatch {
  color: var(--danger);
}

.asr-result-heading span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

.asr-transcript {
  display: grid;
  margin: 10px 0;
  gap: 2px;
}

.asr-transcript span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 750;
}

.asr-transcript q {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
}

.asr-keyword {
  margin: 0;
  font-size: 0.84rem;
  font-weight: 750;
}

@keyframes asr-pulse {
  from {
    opacity: 0.35;
    transform: scale(0.85);
  }
  to {
    opacity: 1;
    transform: scale(1.1);
  }
}

@media (max-width: 520px) {
  .asr-heading-row,
  .recorder-heading-row {
    align-items: stretch;
    flex-direction: column;
  }

  .asr-start-button,
  .recorder-toggle-button {
    width: 100%;
  }

  .recorder-playback-actions {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .asr-listening-dot {
    animation: none;
  }
}

.incorrect-button {
  border-color: color-mix(in srgb, var(--danger) 40%, var(--border));
  color: var(--danger);
}

.completion-screen {
  display: grid;
  gap: 18px;
}

.completion-hero {
  padding: 32px 22px;
  text-align: center;
}

.completion-mark {
  display: grid;
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--success) 16%, transparent);
  color: var(--success);
  font-size: 2rem;
  font-weight: 850;
}

.completion-hero h1 {
  margin: 6px 0 24px;
  font-size: clamp(1.5rem, 6vw, 2rem);
}

.completion-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  border-radius: 14px;
  background: var(--border);
}

.completion-stats div {
  display: grid;
  padding: 16px 8px;
  background: var(--surface-soft);
}

.completion-stats strong {
  font-size: 1.5rem;
}

.completion-stats span,
.known-summary {
  color: var(--muted);
  font-size: 0.82rem;
}

.known-summary {
  margin: 16px 0 0;
}

.stage-summary {
  padding: 22px;
}

.stage-summary h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

.stage-count-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.stage-count-grid div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--surface-soft);
  font-size: 0.84rem;
}

.page-heading {
  margin-bottom: 24px;
}

.page-heading h1 {
  margin-bottom: 6px;
}

.page-heading p:last-child {
  margin: 0;
  color: var(--muted);
}

.settings-form {
  display: grid;
  gap: 16px;
}

.settings-group {
  padding: 22px;
}

.settings-group h2 {
  margin-bottom: 12px;
}

.export-settings > p:first-of-type,
.export-settings > small {
  display: block;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.84rem;
}

.export-settings > small {
  margin: 10px 0 0;
}

.number-setting,
.toggle-setting,
.date-setting,
.token-setting {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
  gap: 16px;
  border-top: 1px solid var(--border);
}

.number-setting small,
.date-setting small,
.token-setting small {
  display: block;
  color: var(--muted);
}

.number-input-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
}

.number-input-wrap input {
  width: 72px;
  min-height: 46px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--background);
  color: var(--text);
  font-weight: 750;
  text-align: right;
}

.date-setting input,
.token-setting input {
  min-height: 46px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--background);
  color: var(--text);
}

.token-setting {
  align-items: flex-start;
  padding: 12px 0;
  flex-direction: column;
}

.token-setting input {
  width: 100%;
}

.sync-status {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.sync-status.has-pending {
  color: var(--danger);
}

.toggle-setting {
  position: relative;
  cursor: pointer;
  font-weight: 700;
}

.toggle-setting input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.toggle-control {
  position: relative;
  flex: 0 0 auto;
  width: 52px;
  height: 30px;
  border-radius: 999px;
  background: var(--border);
  transition: background 140ms ease;
}

.toggle-control::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 5px rgb(0 0 0 / 20%);
  content: "";
  transition: transform 140ms ease;
}

.toggle-setting input:checked + .toggle-control {
  background: var(--primary);
}

.toggle-setting input:checked + .toggle-control::after {
  transform: translateX(22px);
}

.toggle-setting input:focus-visible + .toggle-control {
  outline: 3px solid #75a0ff;
  outline-offset: 3px;
}

.save-message {
  min-height: 1.5em;
  margin: 0;
  color: var(--success);
  text-align: center;
}

.loading-panel,
.error-panel {
  padding: 42px 24px;
  text-align: center;
}

.loading-spinner {
  width: 38px;
  height: 38px;
  margin: 0 auto 14px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.error-icon {
  display: grid;
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--danger) 15%, transparent);
  color: var(--danger);
  font-size: 1.5rem;
  font-weight: 850;
}

.toast {
  position: fixed;
  z-index: 20;
  right: 16px;
  bottom: calc(16px + env(safe-area-inset-bottom));
  left: 16px;
  width: min(calc(100% - 32px), 500px);
  margin: auto;
  padding: 12px 16px;
  border-radius: 12px;
  background: #172033;
  box-shadow: var(--shadow);
  color: #fff;
  font-size: 0.9rem;
  text-align: center;
}

.toast[data-type="error"] {
  background: #8f2828;
}

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

@media (min-width: 640px) {
  .site-header {
    padding-right: 28px;
    padding-left: 28px;
  }

  .app-shell {
    padding-top: 42px;
  }

  .hero,
  .word-card {
    padding: 34px;
  }

  .sentence-card,
  .settings-group,
  .progress-panel,
  .analytics-panel,
  .stage-summary {
    padding: 26px;
  }

  .analytics-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .answer-panel,
  .completion-hero {
    padding: 34px;
  }
}

@media (max-width: 420px) {
  .brand-button > span:last-child {
    display: none;
  }

  .app-shell {
    width: min(100% - 24px, 720px);
    padding-top: 18px;
  }

  .hero h1 {
    font-size: 1.55rem;
  }

  .word-card h1 {
    overflow-wrap: anywhere;
    font-size: 2.45rem;
  }

  .recall-cue {
    min-height: 230px;
    padding: 28px 18px;
  }

  .date-setting {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
  }

  .date-setting input {
    width: 100%;
  }
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --background: #111827;
    --surface: #182235;
    --surface-soft: #202e48;
    --text: #f4f7fb;
    --muted: #aeb9cc;
    --border: #344159;
    --primary: #7ca3ff;
    --primary-hover: #99b8ff;
    --primary-text: #101827;
    --accent: #26395f;
    --success: #65d7ba;
    --danger: #ff8c8c;
    --shadow: 0 14px 35px rgb(0 0 0 / 24%);
  }
}