:root {
  color-scheme: light dark;
  --background: #f4f4f7;
  --surface: #ffffff;
  --text: #111111;
  --muted: #6b6b70;
  --border: #d9d9de;
  --accent: #0a84ff;
  --accent-text: #ffffff;
  --success: #227a3b;
  --error: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #111214;
    --surface: #1c1d20;
    --text: #f5f5f7;
    --muted: #a1a1a7;
    --border: #37383d;
    --accent: #409cff;
    --success: #5ac878;
    --error: #ff746b;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.privacy-page {
  line-height: 1.55;
}

.privacy-page h2 {
  margin-top: 28px;
}

button, input, select {
  font: inherit;
}

button, select, input {
  min-height: 46px;
}

.app {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 20px 16px calc(32px + env(safe-area-inset-bottom));
}

.header,
.exercise-meta,
.progress-title,
.actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header h1 {
  margin: 0;
}

.header p,
#hint,
#progressText,
#exerciseCounter {
  color: var(--muted);
}

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

.speech-rate-control {
  color: var(--muted);
  font-size: 12px;
}

.speech-rate-control select {
  min-width: 82px;
}

.stats,
.controls {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.stats {
  grid-template-columns: repeat(5, 1fr);
}

.stats > div,
.exercise-card,
.progress-section,
.analytics-section,
.learning-tools,
.cloud-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
}

.cloud-panel {
  margin-top: 16px;
  padding: 16px;
}

.cloud-summary,
.cloud-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.cloud-consent {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

.cloud-consent input {
  flex: 0 0 auto;
  min-height: auto;
  margin-top: 2px;
}

.cloud-summary h2,
.cloud-summary p {
  margin: 0;
}

.cloud-summary p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.cloud-actions {
  justify-content: flex-start;
  margin-top: 14px;
}

.sync-status {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}

.sync-status.synced {
  border-color: color-mix(in srgb, var(--success) 45%, var(--border));
  color: var(--success);
}

.sync-status.pending,
.sync-status.syncing {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  color: var(--accent);
}

.personalization-reason {
  margin: -8px 0 16px;
  padding: 10px 12px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-size: 14px;
}

.course-progress {
  margin: -2px 0 16px;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 36%, var(--border));
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  color: var(--text);
  font-size: 14px;
}

.learning-tools {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 18px;
  margin-top: 16px;
  padding: 18px;
}

.learning-tools h2 {
  margin: 0 0 12px;
  font-size: 17px;
}

.course-map {
  display: grid;
  gap: 9px;
}

.course-stage {
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.course-stage.current {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, var(--surface));
}

.course-stage > div:first-child {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
}

.course-stage > div:first-child span {
  color: var(--muted);
}

.course-stage-track {
  height: 5px;
  margin-top: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in srgb, var(--border) 65%, transparent);
}

.course-stage-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.diagnostic-actions {
  display: grid;
  gap: 8px;
}

.special-session-status {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.stats > div {
  padding: 12px;
}

.stats span {
  display: block;
  font-size: 13px;
  color: var(--muted);
}

.stats strong {
  display: block;
  margin-top: 4px;
  font-size: 24px;
}

.controls {
  grid-template-columns: 1fr 1fr;
}

label {
  display: grid;
  gap: 6px;
}

select,
input[type="text"],
input[type="password"],
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--surface);
  color: var(--text);
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.exercise-card,
.progress-section,
.analytics-section {
  margin-top: 16px;
  padding: 18px;
}

.analytics-section > summary {
  cursor: pointer;
  font-size: 18px;
  font-weight: 700;
}

.privacy-note,
.analytics-status {
  color: var(--muted);
}

.analytics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 16px;
}

.analytics-grid > div {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.analytics-grid span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.analytics-grid strong {
  display: block;
  margin-top: 5px;
  font-size: 22px;
}

.analytics-detail h3 {
  margin-bottom: 6px;
}

.api-settings {
  margin-top: 16px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--background) 48%, transparent);
}

.settings-heading,
.settings-actions,
.behavior-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
}

.settings-heading {
  justify-content: space-between;
}

.settings-heading h3,
.settings-heading p {
  margin: 0;
}

.api-key-status {
  margin-top: 4px !important;
  color: var(--muted);
}

.api-key-status.configured {
  color: var(--success);
}

.api-settings label {
  margin-top: 14px;
}

.api-settings code {
  overflow-wrap: anywhere;
}

.settings-actions {
  flex-wrap: wrap;
  margin-top: 12px;
}

.behavior-toggle {
  align-items: flex-start;
  margin-top: 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.behavior-toggle input {
  min-height: auto;
  margin-top: 3px;
}

.behavior-toggle small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
}

.analytics-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.danger-link {
  color: var(--error);
}

.report-button {
  margin-top: 16px;
  color: var(--muted);
}

dialog {
  width: min(560px, calc(100% - 32px));
  max-height: calc(100vh - 32px);
  overflow: auto;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 24px 80px rgb(0 0 0 / 32%);
}

dialog::backdrop {
  background: rgb(0 0 0 / 58%);
  backdrop-filter: blur(3px);
}

.dialog-heading,
.dialog-actions,
.report-snapshot-option {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dialog-heading {
  align-items: flex-start;
  justify-content: space-between;
}

.dialog-heading h2,
.dialog-heading p {
  margin: 0;
}

.dialog-heading p {
  margin-top: 5px;
}

#reportForm {
  display: grid;
  gap: 14px;
}

.dialog-close {
  min-width: 46px;
  padding: 6px 12px;
  font-size: 24px;
  line-height: 1;
}

.report-snapshot-option {
  align-items: flex-start;
}

.report-snapshot-option input {
  min-height: auto;
  margin-top: 4px;
}

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

.analytics-status {
  min-height: 24px;
  margin-top: 12px;
}

.ai-report {
  margin-top: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
}

.ai-report h3,
.ai-report h4 {
  margin: 14px 0 6px;
}

.ai-report h3:first-child {
  margin-top: 0;
}

.ai-report ul,
.ai-report ol {
  margin-top: 6px;
  padding-left: 22px;
}

.exercise-card h2 {
  margin: 28px 0 8px;
  text-align: center;
  font-size: clamp(24px, 6vw, 38px);
}

.exercise-context {
  margin-top: 22px;
  padding: 16px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
  color: var(--text);
  font-size: 16px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.exercise-context + h2 {
  margin-top: 20px;
}

.badge {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  font-size: 13px;
}

#answerArea {
  margin-top: 20px;
}

.feedback {
  min-height: 64px;
  margin-top: 16px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.feedback.success {
  color: var(--success);
}

.feedback.error {
  color: var(--error);
}

.feedback.notice {
  color: var(--accent);
}

.answer-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.answer-comparison > strong {
  grid-column: 1 / -1;
  color: var(--accent);
}

.answer-comparison div {
  min-width: 0;
}

.answer-comparison span {
  color: var(--muted);
  font-size: 12px;
}

.answer-comparison p {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
}

.weekly-report {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  line-height: 1.5;
}

.weekly-report ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.actions {
  justify-content: flex-start;
  flex-wrap: wrap;
  margin-top: 14px;
}

button {
  border-radius: 12px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

button:not(:disabled) {
  cursor: pointer;
}

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

button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 38%, transparent);
  outline-offset: 2px;
}

.primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.secondary {
  background: var(--surface);
}

.link-button {
  min-height: auto;
  padding: 0;
  border: 0;
  text-decoration: underline;
}

.choice-list,
.token-bank {
  display: grid;
  gap: 10px;
}

.choice,
.token {
  text-align: left;
}

.choice.selected,
.token.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

.choice[aria-pressed="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

.hint:empty {
  display: none;
}

.learning-stage {
  width: fit-content;
  margin: 12px auto 0;
  padding: 7px 11px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--success) 12%, transparent);
  color: var(--success);
  font-size: 14px;
  font-weight: 600;
}

.learning-stage:empty {
  display: none;
}

.scaffold-builder {
  display: grid;
  gap: 12px;
}

.scaffold-instruction {
  margin: 0;
  color: var(--muted);
  text-align: center;
}

.piece-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 70px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--background) 55%, transparent);
}

.piece {
  min-width: 48px;
  padding-inline: 13px;
  text-align: center;
}

.piece.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

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

.built-answer {
  min-height: 54px;
  margin-bottom: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  margin-top: 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--border) 60%, transparent);
}

#progressBar {
  width: 0;
  height: 100%;
  background: var(--accent);
  transition: width 180ms ease;
}

@media (max-width: 560px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .controls {
    grid-template-columns: 1fr;
  }

  .learning-tools {
    grid-template-columns: 1fr;
  }

  .answer-comparison {
    grid-template-columns: 1fr;
  }

  .analytics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .header {
    align-items: flex-start;
  }

  .header {
    flex-direction: column;
  }

  .header-actions {
    width: 100%;
    align-items: stretch;
    flex-direction: column;
  }

  .header button,
  .actions button,
  .cloud-actions button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  #progressBar {
    transition: none;
  }
}