@charset "UTF-8";

:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #fbfcff;
  --ink: #172033;
  --muted: #667085;
  --line: #d8dee8;
  --accent: #0b63ce;
  --accent-dark: #074ea4;
  --orange: #9a6700;
  --focus: #0b63ce;
  --ok: #16794c;
  --fail: #b42318;
  --wait: #9a6700;
}

@media (min-width: 761px) {
  body:not(.mobile-preview-mode) .stage-panel > .lesson-context {
    box-sizing: border-box;
    max-height: none;
    padding-top: 12px;
    padding-bottom: 12px;
    overflow: visible;
  }

  body:not(.mobile-preview-mode) .stage-panel > .lesson-context strong {
    display: block;
    max-height: none;
    overflow: visible;
    font-size: 15px;
    line-height: 1.38;
    overflow-wrap: anywhere;
    -webkit-line-clamp: unset;
  }

  body:not(.mobile-preview-mode) .stage-panel > .lesson-context p {
    display: block;
    max-height: none;
    overflow: visible;
    font-size: 13px;
    line-height: 1.45;
    overflow-wrap: anywhere;
    -webkit-line-clamp: unset;
  }
}

.lesson-context p[hidden] {
  display: none !important;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

button {
  min-height: 32px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 12px;
  background: var(--ink);
  color: #fff;
  cursor: pointer;
}

button:hover {
  background: #2c3842;
}

button.is-loading {
  cursor: wait;
  opacity: 0.82;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 30%, transparent);
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  min-height: 58px;
  display: grid;
  grid-template-columns: minmax(150px, 190px) minmax(520px, 1fr) minmax(170px, 220px);
  gap: 12px;
  align-items: start;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 740;
  white-space: nowrap;
}

.brand-mark {
  width: 24px;
  height: 24px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--accent), #6cae75 58%, var(--orange));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.42);
}

.promptbar {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) auto;
  gap: 8px;
  align-items: start;
}

.input-group {
  display: grid;
  gap: 6px;
}

.input-group span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.problem-input-group,
.json-input-group {
  grid-column: auto;
}

.json-input-group,
.prompt-actions .secondary-action,
.examples {
  display: none;
}

body.debug-mode .json-input-group {
  display: grid;
}

body.debug-mode .prompt-actions .secondary-action {
  display: inline-flex;
  align-items: center;
}

body.debug-mode .examples {
  display: flex;
}

body.debug-mode .promptbar {
  grid-template-columns: minmax(220px, 0.42fr) minmax(320px, 0.58fr) auto;
}

.promptbar textarea {
  width: 100%;
  min-height: 62px;
  max-height: 88px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--surface);
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.35;
}

.json-input-group textarea {
  min-height: 62px;
}

.promptbar button,
.prompt-actions button {
  background: var(--accent);
}

.promptbar button:hover,
.prompt-actions button:hover {
  background: var(--accent-dark);
}

.prompt-actions .secondary-action {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.prompt-actions .secondary-action:hover {
  background: var(--surface-2);
}

.prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 0;
  align-self: end;
}

.flyai-lesson-status {
  grid-column: 1 / -1;
  min-height: 18px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.flyai-lesson-status.is-loading::before,
.tutor-question-status.is-loading::before {
  content: "";
  width: 10px;
  height: 10px;
  display: inline-block;
  margin-right: 6px;
  border: 2px solid color-mix(in srgb, var(--accent) 26%, transparent);
  border-top-color: var(--accent);
  border-radius: 50%;
  vertical-align: -1px;
  animation: loading-spin 0.8s linear infinite;
}

.flyai-lesson-status.is-error {
  color: #b3261e;
}

.stage-loading-overlay.is-error .loading-card {
  border-color: color-mix(in srgb, #b3261e 46%, var(--line));
  background: color-mix(in srgb, #fff 92%, #fce8e6);
}

.stage-loading-overlay.is-error .loading-spinner,
.stage-loading-overlay.is-error .loading-stream-panel,
.stage-loading-overlay.is-error .loading-reason-status {
  display: none;
}

.stage-loading-overlay.is-error #stageLoadingTitle {
  color: #b3261e;
}

.stage-loading-overlay.is-error .loading-detail {
  max-width: 560px;
  color: color-mix(in srgb, #b3261e 82%, var(--ink));
  white-space: normal;
}

.examples {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.examples button {
  min-height: 26px;
  border-color: var(--line);
  padding: 0 9px;
  background: var(--surface);
  color: var(--ink);
  font-size: 12px;
}

.examples button:hover {
  background: var(--surface-2);
}

body:not(.debug-mode) .json-input-group,
body:not(.debug-mode) .prompt-actions .secondary-action,
body:not(.debug-mode) .examples {
  display: none;
}

.json-error {
  grid-column: 1 / -1;
  min-height: 16px;
  margin: 0;
  color: #b3261e;
  font-size: 12px;
}

.controls {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.speed-control {
  min-width: 150px;
  min-height: 34px;
  display: grid;
  grid-template-columns: auto minmax(78px, 1fr);
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 9px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
}

.speed-control input {
  width: 100%;
}

.workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 360px);
}

.stage-panel {
  position: relative;
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto 46px;
  align-content: start;
  padding: 12px;
  gap: 10px;
}

#stage {
  justify-self: center;
  width: min(100%, 900px);
  height: auto;
  aspect-ratio: 16 / 11;
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfaf6;
}

.stage-loading-overlay {
  position: absolute;
  inset: 12px 12px 68px;
  z-index: 12;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: color-mix(in srgb, var(--bg) 62%, transparent);
  backdrop-filter: blur(2px);
  pointer-events: none;
}

.stage-loading-overlay[hidden] {
  display: none;
}

.loading-card {
  width: min(560px, calc(100% - 32px));
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  row-gap: 3px;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--line));
  border-radius: 8px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 28px rgba(29, 37, 44, 0.14);
}

.loading-card.has-stream {
  width: min(560px, calc(100% - 32px));
  grid-template-rows: auto auto auto;
}

.stage-loading-overlay:not(.is-error) #stageLoadingTitle,
.stage-loading-overlay:not(.is-error) .loading-detail {
  display: none;
}

.stage-loading-overlay:not(.is-error) .loading-card:not(.has-stream) .loading-stream-panel {
  display: none;
}

.stage-loading-overlay:not(.is-error) .loading-card {
  width: min(560px, calc(100% - 32px));
  grid-template-columns: 32px minmax(0, 1fr);
  grid-template-rows: auto auto auto;
}

.stage-loading-overlay:not(.is-error) .loading-card:not(.has-stream) .loading-spinner {
  grid-row: 1 / 3;
}

.stage-loading-overlay:not(.is-error) .loading-card.has-stream .loading-spinner {
  grid-row: 1 / 2;
}

#flywait-entry {
  grid-column: 2;
  min-width: 0;
  margin-top: 0 !important;
}

.loading-reason-status {
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  min-height: 0;
  max-height: none;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-behavior: smooth;
  border-top: 1px solid color-mix(in srgb, var(--accent) 12%, var(--line));
  color: color-mix(in srgb, var(--ink) 82%, var(--muted));
  font: 11.5px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.loading-reason-status[hidden] {
  display: none;
}

.loading-reason-text {
  display: block;
  min-width: 0;
  white-space: inherit;
  padding: 8px 11px 10px;
}

.loading-spinner {
  grid-row: 1 / 3;
  width: 30px;
  height: 30px;
  border: 4px solid color-mix(in srgb, var(--accent) 18%, var(--line));
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: loading-spin 0.82s linear infinite;
}

.loading-card strong {
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.25;
}

.loading-detail {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.loading-stream-panel {
  grid-column: 1 / -1;
  min-width: 0;
  margin-top: 12px;
  display: grid;
  grid-template-columns: minmax(210px, 0.85fr) minmax(300px, 1.25fr);
  grid-template-areas:
    "header header"
    "timeline output";
  gap: 10px 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
  border-radius: 10px;
  padding: 14px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 6%, #fff), #fff 66%);
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 85%);
}

.loading-stream-panel[hidden] {
  display: none;
}

.loading-stream-header {
  grid-area: header;
  display: flex;
  gap: 8px;
  align-items: center;
  min-width: 0;
}

.loading-thinking-pulse {
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 30%, transparent);
  animation: loading-thinking-pulse 1.5s ease-out infinite;
}

.loading-stream-label {
  min-width: 0;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.loading-stream-state {
  margin-left: auto;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line));
  border-radius: 999px;
  padding: 3px 8px;
  color: #52637a;
  background: #fff;
  font-size: 11px;
  line-height: 1.2;
  white-space: nowrap;
}

.loading-stream-state.is-live {
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 9%, #fff);
}

.loading-thinking-stream {
  grid-area: timeline;
  min-width: 0;
}

.loading-stream-section-label {
  display: block;
  margin-bottom: 6px;
  color: #667b96;
  font-size: 11.5px;
  font-weight: 650;
}

.loading-thinking-timeline {
  position: relative;
  min-height: 0;
  max-height: min(126px, 18vh);
  margin: 0;
  overflow: auto;
  border: 1px solid color-mix(in srgb, var(--accent) 18%, var(--line));
  border-left: 3px solid color-mix(in srgb, var(--accent) 58%, var(--line));
  border-radius: 7px;
  padding: 9px 10px;
  white-space: pre-line;
  color: #71839b;
  background: rgb(255 255 255 / 78%);
  font-size: 11.5px;
  font-weight: 400;
  line-height: 1.6;
}

.loading-model-stream {
  grid-area: output;
  min-width: 0;
}

.loading-model-output {
  min-height: 72px;
  max-height: min(126px, 18vh);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line));
  border-radius: 7px;
  background: #fff;
}

.loading-model-output pre {
  flex: 1 1 auto;
  min-height: 0;
  margin: 0;
  overflow: auto;
  border: 0;
  padding: 10px 11px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: #8292a8;
  background: transparent;
  font: 11.5px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.loading-model-output pre.is-waiting {
  color: #71839b;
  font-family: inherit;
  font-style: normal;
}

@keyframes loading-thinking-pulse {
  70% {
    box-shadow: 0 0 0 8px transparent;
  }

  100% {
    box-shadow: 0 0 0 0 transparent;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .loading-thinking-pulse,
  .loading-thinking-timeline,
  .loading-spinner {
    animation-duration: 3.5s;
  }
}

.timeline {
  min-height: 44px;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: var(--surface);
}

.timeline span {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
}

.timeline input {
  width: 100%;
  accent-color: var(--accent);
}

.inspector {
  border-left: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.58);
  padding: 12px;
  overflow: auto;
}

.inspector section + section {
  margin-top: 18px;
}

.inspector h2 {
  margin: 0 0 8px;
  font-size: 12px;
  line-height: 1.2;
  color: var(--muted);
  text-transform: uppercase;
}

.action-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.action-list li {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 8px;
  background: var(--surface);
  color: var(--ink);
}

.action-list li.is-active {
  border-color: color-mix(in srgb, var(--accent) 54%, var(--line));
  background: color-mix(in srgb, var(--accent) 10%, #fff);
}

.action-list time {
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.action-list span {
  overflow-wrap: anywhere;
  font-size: 12px;
}

.step-text {
  min-height: 70px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

.tutor-question-section {
  position: sticky;
  top: 12px;
  z-index: 4;
  width: 100%;
  max-height: none;
  overflow: visible;
  margin: 0;
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--line));
  border-radius: 8px;
  padding: 12px;
  background: #f6fffc;
  box-shadow: 0 8px 22px rgba(36, 124, 107, 0.12);
}

.inspector .tutor-question-section h2 {
  margin: 0 0 9px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 760;
  line-height: 1.2;
  text-transform: none;
}

.tutor-question-form {
  display: grid;
  gap: 8px;
}

.tutor-question-form textarea {
  width: 100%;
  min-height: 84px;
  max-height: 140px;
  resize: vertical;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: 8px;
  padding: 10px 11px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.45;
}

.tutor-question-section.is-automatic-followup-locked textarea,
.tutor-question-section.is-automatic-followup-locked .tutor-question-tips button,
.tutor-question-section.is-automatic-followup-locked .tutor-image-picker span,
.tutor-question-section.is-automatic-followup-locked #tutorQuestionButton {
  cursor: not-allowed;
  opacity: 0.58;
}

.tutor-question-section.is-automatic-followup-locked textarea {
  background: color-mix(in srgb, var(--surface) 72%, var(--canvas-grid, #d8e3f1));
}

.tutor-image-row,
.question-image-row {
  display: grid;
  gap: 7px;
}

.tutor-image-picker,
.question-image-picker {
  width: max-content;
  max-width: 100%;
}

.tutor-image-picker input,
.question-image-picker input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.tutor-image-picker span,
.question-image-picker span {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line));
  border-radius: 8px;
  padding: 5px 10px;
  background: #ffffff;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 720;
  line-height: 1.2;
  cursor: pointer;
}

.tutor-image-picker:focus-within span,
.tutor-image-picker span:hover,
.question-image-picker:focus-within span,
.question-image-picker span:hover {
  border-color: var(--accent);
  background: #f2fffb;
}

.tutor-image-preview,
.question-image-preview {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--line));
  border-radius: 8px;
  padding: 7px 8px;
  background: #ffffff;
}

.tutor-image-preview[hidden],
.question-image-preview[hidden] {
  display: none;
}

.tutor-image-preview span,
.question-image-preview span {
  min-width: 0;
  overflow: hidden;
  color: var(--ink);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tutor-image-preview button,
.question-image-preview button {
  min-height: 28px;
  flex: 0 0 auto;
  border-color: color-mix(in srgb, #b3261e 28%, var(--line));
  padding-inline: 8px;
  color: #8b1d17;
  font-size: 12px;
}

.recognized-visual-summary {
  margin-top: 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line));
  border-radius: 10px;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--accent) 5%, #fff);
}

.recognition-data-cache {
  display: none !important;
}

.recognized-visual-summary[hidden] {
  display: none;
}

.recognized-visual-summary h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 14px;
}

.recognized-visual-summary h3 span {
  margin-left: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.recognized-visual-summary textarea {
  width: 100%;
  min-height: 112px;
  resize: vertical;
  border: 1px solid color-mix(in srgb, var(--accent) 18%, var(--line));
  border-radius: 8px;
  padding: 9px 10px;
  white-space: pre-wrap;
  color: var(--ink-soft);
  background: #fff;
  font-size: 13px;
  line-height: 1.65;
}

.tutor-question-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.tutor-question-actions button {
  min-height: 34px;
}

.tutor-question-actions button[type="submit"] {
  background: var(--accent);
  padding-inline: 14px;
  font-weight: 700;
}

.tutor-question-actions button[type="submit"]:hover {
  background: var(--accent-dark);
}

.tutor-question-status {
  min-height: 16px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.tutor-question-status.is-error {
  color: #b3261e;
}

.lesson-summary-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.92);
}

.inspector .lesson-summary-section h2 {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 780;
  line-height: 1.25;
  text-transform: none;
}

.lesson-summary {
  display: grid;
  gap: 14px;
}

.summary-group {
  display: grid;
  gap: 7px;
}

.summary-group h3 {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
  font-weight: 780;
  line-height: 1.25;
}

.summary-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 5px;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.48;
}

.summary-list li::marker {
  color: var(--accent);
  font-weight: 700;
}

.summary-answer {
  margin: 0;
  border-left: 4px solid var(--accent);
  padding: 8px 0 8px 11px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 720;
  line-height: 1.48;
  overflow-wrap: anywhere;
}

.summary-empty {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.debug-panel {
  margin-top: 18px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.debug-panel[hidden] {
  display: none;
}

.debug-panel summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  line-height: 1.2;
  text-transform: uppercase;
}

.debug-panel section {
  margin-top: 14px;
}

.problem-text {
  min-height: 58px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

.reasoning-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  list-style: none;
}

.reasoning-list li {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  background: var(--surface);
}

.reasoning-list strong {
  display: block;
  margin-bottom: 5px;
  color: var(--ink);
  font-size: 13px;
}

.reasoning-list p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.meta-list {
  margin: 0;
  display: grid;
  gap: 6px;
}

.meta-list div {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 8px;
  min-height: 28px;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.meta-list dt {
  color: var(--muted);
  font-size: 12px;
}

.meta-list dd {
  margin: 0;
  font-size: 12px;
  overflow-wrap: anywhere;
}

.domain-expression-list div {
  grid-template-columns: 92px minmax(0, 1fr);
}

@media (max-width: 1100px) {
  .topbar {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .controls {
    justify-content: flex-start;
  }

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

  .inspector {
    border-top: 1px solid var(--line);
    border-left: 0;
    overflow: visible;
  }

  .tutor-question-section {
    position: static;
  }
}

@media (max-width: 720px) {
  body {
    overflow-x: hidden;
  }

  .topbar {
    gap: 10px;
    padding: 10px;
  }

  .brand {
    min-height: 28px;
  }

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

  .prompt-actions,
  .question-image-row,
  .examples,
  .json-error {
    grid-column: 1 / -1;
  }

  .promptbar textarea {
    min-height: 54px;
    max-height: 84px;
    font-size: 12px;
  }

  .json-input-group textarea {
    min-height: 46px;
    max-height: 68px;
  }

  .prompt-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-self: stretch;
  }

  .prompt-actions button {
    width: 100%;
    min-height: 38px;
    padding-inline: 8px;
  }

  .question-image-picker,
  .question-image-picker span {
    width: 100%;
  }

  .question-image-picker span {
    justify-content: center;
  }

  .examples {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: thin;
  }

  .examples button {
    flex: 0 0 auto;
  }

  .controls {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
  }

  .controls button {
    min-width: 0;
    padding-inline: 8px;
  }

  .speed-control {
    grid-column: 1 / -1;
    min-width: 0;
  }

  .stage-panel {
    padding: 8px;
    gap: 8px;
  }

  #stage {
    width: 100%;
    border-radius: 8px;
  }

  .stage-loading-overlay {
    inset: 8px 8px 60px;
  }

  .loading-card {
    width: min(330px, calc(100% - 20px));
    grid-template-columns: 28px minmax(0, 1fr);
    padding: 13px 14px;
  }

  .loading-card.has-stream {
    width: min(520px, calc(100% - 20px));
  }

  .stage-loading-overlay:not(.is-error) .loading-card.has-stream {
    width: min(330px, calc(100% - 20px));
  }

  .loading-stream-panel {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "header"
      "timeline"
      "output";
  }

  .loading-spinner {
    width: 26px;
    height: 26px;
    border-width: 3px;
  }

  .timeline {
    min-height: 42px;
    grid-template-columns: 50px minmax(0, 1fr);
    padding-inline: 10px;
  }

  .inspector {
    padding: 10px;
  }

  .inspector section + section {
    margin-top: 14px;
  }

  .tutor-question-form textarea {
    min-height: 78px;
  }

  .tutor-question-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .tutor-question-actions button {
    width: 100%;
  }

  .action-list {
    max-height: 220px;
    overflow: auto;
  }
}

@media (max-width: 430px) {
  .topbar {
    padding: 8px;
  }

  .brand span:last-child {
    font-size: 15px;
  }

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

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

  .stage-panel {
    padding-inline: 6px;
  }

  .loading-card strong {
    font-size: 14px;
  }

  .loading-detail {
    font-size: 12px;
  }

  .loading-stream-panel {
    gap: 8px;
    padding: 10px;
  }

  .loading-thinking-timeline {
    min-height: 0;
    max-height: min(96px, 14vh);
    padding: 7px 8px;
    font-size: 10.5px;
    line-height: 1.45;
  }

  .loading-model-output {
    min-height: 64px;
    max-height: min(108px, 16vh);
  }

  .loading-model-output pre {
    padding: 8px 9px;
    font-size: 10.5px;
  }

  .loading-reason-status {
    font-size: 10.5px;
  }

  .loading-reason-text {
    padding: 7px 9px 8px;
  }
}

body.mobile-preview-mode {
  min-height: 100vh;
  overflow: auto;
  background: #20272d;
}

body.mobile-preview-mode .app-shell {
  width: min(390px, 100vw);
  min-height: 844px;
  margin: 16px auto;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 18px;
  overflow: hidden;
  background: var(--bg);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

body.mobile-preview-mode .topbar {
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 8px;
  align-items: stretch;
}

body.mobile-preview-mode .brand {
  min-height: 28px;
}

body.mobile-preview-mode .brand span:last-child {
  font-size: 18px;
}

body.mobile-preview-mode .promptbar {
  grid-template-columns: 1fr;
}

body.mobile-preview-mode .prompt-actions,
body.mobile-preview-mode .question-image-row,
body.mobile-preview-mode .examples,
body.mobile-preview-mode .json-error {
  grid-column: 1 / -1;
}

body.mobile-preview-mode .promptbar textarea {
  min-height: 150px;
  max-height: 220px;
  padding: 12px 13px;
  font-size: 16px;
  line-height: 1.5;
}

body.mobile-preview-mode .prompt-actions {
  display: grid;
  grid-template-columns: 1fr;
  align-self: stretch;
}

body.mobile-preview-mode .prompt-actions button {
  width: 100%;
  min-height: 52px;
  padding-inline: 8px;
  font-size: 16px;
}

body.mobile-preview-mode .question-image-picker,
body.mobile-preview-mode .question-image-picker span {
  width: 100%;
}

body.mobile-preview-mode .question-image-picker span {
  justify-content: center;
  min-height: 44px;
  font-size: 15px;
}

body.mobile-preview-mode.debug-mode .examples {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

body.mobile-preview-mode.debug-mode .examples button {
  flex: 0 0 auto;
}

body.mobile-preview-mode .controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  justify-content: stretch;
}

body.mobile-preview-mode .controls button {
  min-width: 0;
  padding-inline: 8px;
}

body.mobile-preview-mode .speed-control {
  grid-column: 1 / -1;
  min-width: 0;
}

body.mobile-preview-mode .workspace {
  grid-template-columns: 1fr;
}

body.mobile-preview-mode .stage-panel {
  padding: 6px;
  gap: 8px;
}

body.mobile-preview-mode #stage {
  width: 100%;
  border-radius: 8px;
}

body.mobile-preview-mode .stage-loading-overlay {
  inset: 6px 6px 60px;
}

body.mobile-preview-mode .loading-card {
  width: min(330px, calc(100% - 20px));
  grid-template-columns: 28px minmax(0, 1fr);
  padding: 13px 14px;
}

body.mobile-preview-mode .loading-card.has-stream {
  width: min(520px, calc(100% - 20px));
}

body.mobile-preview-mode .stage-loading-overlay:not(.is-error) .loading-card.has-stream {
  width: min(330px, calc(100% - 20px));
}

body.mobile-preview-mode .loading-spinner {
  width: 26px;
  height: 26px;
  border-width: 3px;
}

body.mobile-preview-mode .timeline {
  min-height: 42px;
  grid-template-columns: 50px minmax(0, 1fr);
  padding-inline: 10px;
}

body.mobile-preview-mode .inspector {
  border-top: 1px solid var(--line);
  border-left: 0;
  padding: 10px;
  overflow: visible;
}

body.mobile-preview-mode .inspector section + section {
  margin-top: 14px;
}

body.mobile-preview-mode .tutor-question-section {
  position: static;
}

body.mobile-preview-mode .tutor-question-form textarea {
  min-height: 112px;
  font-size: 16px;
  line-height: 1.5;
}

body.mobile-preview-mode .tutor-image-picker,
body.mobile-preview-mode .tutor-image-picker span {
  width: 100%;
}

body.mobile-preview-mode .tutor-image-picker span {
  justify-content: center;
  min-height: 40px;
  font-size: 15px;
}

body.mobile-preview-mode .tutor-question-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

body.mobile-preview-mode .tutor-question-actions button {
  width: 100%;
}

body.mobile-preview-mode .action-list {
  max-height: 220px;
  overflow: auto;
}

body.mini-program-mode {
  min-height: 100dvh;
  overflow: auto;
  background: var(--bg);
}

body.mini-program-mode .app-shell {
  width: 100%;
  min-height: 100dvh;
  margin: 0;
  border: 0;
  border-radius: 0;
  overflow: visible;
  background: var(--bg);
  box-shadow: none;
}

body.mini-program-mode .brand {
  display: none;
}

body.mini-program-mode .topbar {
  padding: 8px;
}

body.mini-program-mode .promptbar textarea {
  min-height: 132px;
  max-height: 210px;
}

body.mini-program-mode .workspace {
  min-height: 0;
}

body.mini-program-mode.question-entry-mode .stage-panel,
body.mini-program-mode.question-entry-mode .inspector {
  display: none;
}

body.mini-program-mode.lesson-rendered-mode .prompt-actions,
body.mini-program-mode.lesson-rendered-mode .question-image-row,
body.mini-program-mode.lesson-rendered-mode .flyai-lesson-status {
  display: none;
}

body.mini-program-mode.lesson-rendered-mode .promptbar textarea {
  min-height: 76px;
  max-height: 92px;
  font-size: 14px;
  line-height: 1.45;
}

/* Runner-inspired workbench layout for the main tutor page. */
body:not(.mobile-preview-mode) {
  overflow: hidden;
  background: var(--bg);
  font: 16px/1.48 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body:not(.mobile-preview-mode) button {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 12px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

body:not(.mobile-preview-mode) button:hover {
  background: #f3f6fb;
}

body:not(.mobile-preview-mode) .app-shell {
  display: grid;
  grid-template-columns: minmax(420px, 520px) minmax(0, 1fr);
  grid-template-rows: 100vh;
  min-height: 100vh;
  background: var(--bg);
}

body:not(.mobile-preview-mode) .topbar {
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: stretch;
  padding: 0;
  border-right: 1px solid var(--line);
  border-bottom: 0;
  background: var(--surface);
  overflow: auto;
  backdrop-filter: none;
}

body:not(.mobile-preview-mode) .brand {
  min-height: auto;
  align-items: flex-start;
  border-bottom: 1px solid var(--line);
  padding: 16px;
  font-size: 20px;
  line-height: 1.2;
}

body:not(.mobile-preview-mode) .brand-mark {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  border-radius: 5px;
  background: var(--accent);
  box-shadow: none;
}

body:not(.mobile-preview-mode) .promptbar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  align-content: start;
  align-items: start;
  border-bottom: 1px solid var(--line);
  padding: 12px 16px;
}

body:not(.mobile-preview-mode) .input-group {
  align-content: start;
  grid-auto-rows: max-content;
}

body:not(.mobile-preview-mode).debug-mode .promptbar {
  grid-template-columns: 1fr;
}

body:not(.mobile-preview-mode) .input-group span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0;
  text-transform: none;
}

body:not(.mobile-preview-mode) .promptbar textarea,
body:not(.mobile-preview-mode) .tutor-question-form textarea {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--ink);
  box-shadow: inset 0 1px 0 rgba(23, 32, 51, 0.02);
}

body:not(.mobile-preview-mode) .promptbar textarea {
  min-height: 148px;
  max-height: 230px;
  padding: 12px 13px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

body:not(.mobile-preview-mode) .json-input-group textarea {
  min-height: 160px;
  max-height: 280px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
}

body:not(.mobile-preview-mode) .prompt-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  align-self: start;
}

body:not(.mobile-preview-mode) .question-image-row {
  gap: 8px;
}

body:not(.mobile-preview-mode).debug-mode .prompt-actions {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

body:not(.mobile-preview-mode) .prompt-actions button,
body:not(.mobile-preview-mode) .tutor-question-actions button[type="submit"] {
  min-height: 48px;
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 650;
}

body:not(.mobile-preview-mode) .prompt-actions button:hover,
body:not(.mobile-preview-mode) .tutor-question-actions button[type="submit"]:hover {
  background: var(--accent-dark);
}

body:not(.mobile-preview-mode) .prompt-actions .secondary-action {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

body:not(.mobile-preview-mode) .prompt-actions .secondary-action:hover {
  background: #f3f6fb;
}

body:not(.mobile-preview-mode) .flyai-lesson-status,
body:not(.mobile-preview-mode) .json-error {
  font-size: 14px;
}

body:not(.mobile-preview-mode) .examples {
  gap: 6px;
  padding-top: 2px;
}

body:not(.mobile-preview-mode) .examples button {
  min-height: 28px;
  border-color: var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 12px;
}

body:not(.mobile-preview-mode) .examples button:hover {
  color: var(--accent);
  background: #eef5ff;
}

body:not(.mobile-preview-mode) .topbar > .controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  justify-content: stretch;
  border-bottom: 1px solid var(--line);
  padding: 12px 16px;
}

body:not(.mobile-preview-mode) .topbar > .controls button {
  min-width: 0;
  color: var(--ink);
}

body:not(.mobile-preview-mode) .stage-panel > .controls {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(128px, 0.7fr) repeat(3, minmax(112px, 0.6fr)) minmax(280px, 3fr);
  gap: 12px;
  align-items: stretch;
  justify-content: start;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 14px 18px;
  background: var(--surface);
}

body:not(.mobile-preview-mode) .stage-panel > .controls button {
  min-width: 0;
  min-height: 58px;
  padding: 10px 16px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 720;
}

body:not(.mobile-preview-mode) .stage-panel > .controls #playPauseButton {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

body:not(.mobile-preview-mode) .stage-panel > .controls #playPauseButton:hover {
  background: var(--accent-dark);
}

body:not(.mobile-preview-mode) .stage-panel > .controls .speed-control {
  grid-column: auto;
  min-width: 260px;
  min-height: 58px;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding-inline: 18px;
  font-size: 18px;
  font-weight: 650;
}

body:not(.mobile-preview-mode) .stage-panel > .controls .speed-control input {
  height: 28px;
}

body:not(.mobile-preview-mode) .speed-control {
  grid-column: 1 / -1;
  min-width: 0;
  min-height: 38px;
  border-radius: 6px;
  background: var(--surface-2);
}

body:not(.mobile-preview-mode) .speed-control input,
body:not(.mobile-preview-mode) .timeline input {
  accent-color: var(--accent);
}

body:not(.mobile-preview-mode) .workspace {
  min-height: 0;
  height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) minmax(260px, 34vh);
  overflow: hidden;
}

body:not(.mobile-preview-mode) .stage-panel {
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) 46px;
  gap: 10px;
  align-content: stretch;
  padding: 14px;
  background: var(--bg);
}

body:not(.mobile-preview-mode) #stage {
  align-self: start;
  justify-self: center;
  width: min(100%, 900px);
  max-height: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
}

body:not(.mobile-preview-mode) .timeline,
body:not(.mobile-preview-mode) .lesson-summary-section,
body:not(.mobile-preview-mode) .tutor-question-section,
body:not(.mobile-preview-mode) .step-text,
body:not(.mobile-preview-mode) .problem-text,
body:not(.mobile-preview-mode) .reasoning-list li,
body:not(.mobile-preview-mode) .action-list li {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  box-shadow: none;
}

body:not(.mobile-preview-mode) .timeline {
  min-height: 44px;
  padding: 0 12px;
}

body:not(.mobile-preview-mode) .inspector {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
  align-content: start;
  gap: 12px;
  border-top: 1px solid var(--line);
  border-left: 0;
  background: var(--surface);
  padding: 12px;
  overflow: auto;
}

body:not(.mobile-preview-mode) .inspector section + section {
  margin-top: 0;
}

body:not(.mobile-preview-mode) .inspector h2,
body:not(.mobile-preview-mode) .inspector .tutor-question-section h2,
body:not(.mobile-preview-mode) .inspector .lesson-summary-section h2 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
  text-transform: none;
}

body:not(.mobile-preview-mode) .tutor-question-section {
  position: static;
  border-color: var(--line);
  padding: 10px;
  background: #fff;
}

body:not(.mobile-preview-mode) .tutor-question-form textarea {
  min-height: 76px;
  max-height: 120px;
  padding: 9px 10px;
  font-size: 14px;
  line-height: 1.4;
}

body:not(.mobile-preview-mode) .tutor-image-picker span,
body:not(.mobile-preview-mode) .tutor-image-preview,
body:not(.mobile-preview-mode) .question-image-picker span,
body:not(.mobile-preview-mode) .question-image-preview {
  border-color: var(--line);
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--ink);
}

body:not(.mobile-preview-mode) .tutor-image-picker span:hover,
body:not(.mobile-preview-mode) .tutor-image-picker:focus-within span,
body:not(.mobile-preview-mode) .question-image-picker span:hover,
body:not(.mobile-preview-mode) .question-image-picker:focus-within span {
  border-color: var(--accent);
  background: #eef5ff;
  color: var(--accent);
}

body:not(.mobile-preview-mode) .tutor-question-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

body:not(.mobile-preview-mode) .tutor-question-actions button {
  width: 100%;
}

body:not(.mobile-preview-mode) .lesson-summary-section {
  padding: 12px;
}

body:not(.mobile-preview-mode) .lesson-summary {
  gap: 10px;
  font-size: 16px;
  line-height: 1.5;
}

body:not(.mobile-preview-mode) .summary-group {
  gap: 8px;
}

body:not(.mobile-preview-mode) .summary-group h3 {
  font-size: 16px;
  line-height: 1.32;
}

body:not(.mobile-preview-mode) .summary-list {
  font-size: 16px;
  line-height: 1.5;
}

body:not(.mobile-preview-mode) .summary-list li::marker {
  color: var(--accent);
}

body:not(.mobile-preview-mode) .summary-answer {
  border-left-color: var(--accent);
  font-size: 17px;
  line-height: 1.45;
}

body:not(.mobile-preview-mode) .debug-panel {
  grid-column: 1 / -1;
  margin-top: 0;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

body:not(.mobile-preview-mode) .action-list {
  max-height: 220px;
  overflow: auto;
}

body:not(.mobile-preview-mode) .action-list li.is-active {
  border-color: var(--accent);
  background: #eef5ff;
}

body:not(.mobile-preview-mode) .stage-loading-overlay {
  inset: 14px 14px 70px;
  border-radius: 7px;
  background: rgba(245, 247, 251, 0.72);
}

body:not(.mobile-preview-mode) .loading-card {
  border-color: var(--line);
  border-radius: 7px;
}

body:not(.mobile-preview-mode) .loading-spinner {
  border-color: #d8e6fb;
  border-top-color: var(--accent);
}

@media (max-width: 1180px) {
  body:not(.mobile-preview-mode) {
    overflow: auto;
  }

  body:not(.mobile-preview-mode) .app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }

  body:not(.mobile-preview-mode) .topbar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    overflow: visible;
  }

  body:not(.mobile-preview-mode) .brand {
    padding: 12px 14px;
  }

  body:not(.mobile-preview-mode) .promptbar {
    padding: 12px 14px;
  }

  body:not(.mobile-preview-mode) .workspace {
    height: auto;
    min-height: 0;
    grid-template-rows: auto auto;
    overflow: visible;
  }

  body:not(.mobile-preview-mode) .stage-panel {
    min-height: 0;
  }

  body:not(.mobile-preview-mode) #stage {
    max-height: none;
  }

  body:not(.mobile-preview-mode) .inspector {
    grid-template-columns: 1fr;
    overflow: visible;
  }
}

@media (max-width: 720px) {
  body:not(.mobile-preview-mode) .topbar > .controls,
  body:not(.mobile-preview-mode) .tutor-question-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body:not(.mobile-preview-mode) .stage-panel > .controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 8px;
  }

  body:not(.mobile-preview-mode) .stage-panel > .controls button {
    min-height: 44px;
    padding-inline: 8px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .stage-panel > .controls .speed-control {
    grid-column: 1 / -1;
    min-width: 0;
    min-height: 44px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .prompt-actions,
  body:not(.mobile-preview-mode).debug-mode .prompt-actions {
    grid-template-columns: 1fr;
  }

  body:not(.mobile-preview-mode) .promptbar textarea {
    min-height: 150px;
    font-size: 16px;
    line-height: 1.5;
  }

  body:not(.mobile-preview-mode) .prompt-actions button {
    min-height: 52px;
    font-size: 16px;
  }

  body:not(.mobile-preview-mode) .question-image-picker span {
    min-height: 44px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .stage-panel {
    padding: 8px;
  }

  body:not(.mobile-preview-mode) .stage-loading-overlay {
    inset: 8px 8px 60px;
  }
}

/* One-screen desktop layout: prompt, stage, and tutor panels fit in one viewport. */
@media (min-width: 1181px) {
  body:not(.mobile-preview-mode) {
    height: 100dvh;
    overflow: hidden;
  }

  body:not(.mobile-preview-mode) .app-shell {
    height: 100dvh;
    min-height: 0;
    display: grid;
    grid-template-columns: clamp(380px, 20vw, 440px) minmax(620px, 1fr) clamp(460px, 24vw, 540px);
    grid-template-rows: minmax(0, 1fr);
  }

  body:not(.mobile-preview-mode) .topbar {
    grid-column: 1;
    grid-row: 1;
    min-height: 0;
    overflow: hidden;
  }

  body:not(.mobile-preview-mode) .workspace {
    display: contents;
  }

  body:not(.mobile-preview-mode) .brand {
    min-height: 52px;
    padding: 14px 16px;
    font-size: 20px;
  }

  body:not(.mobile-preview-mode) .brand-mark {
    width: 18px;
    height: 18px;
    border-radius: 5px;
  }

  body:not(.mobile-preview-mode) .promptbar {
    flex: 0 0 auto;
    min-height: 0;
    padding: 14px 16px;
    gap: 10px;
    align-content: start;
    grid-auto-rows: max-content;
  }

  body:not(.mobile-preview-mode).debug-mode .promptbar {
    overflow: hidden;
  }

  body:not(.mobile-preview-mode) .promptbar textarea {
    height: clamp(148px, 20vh, 190px);
    min-height: 148px;
    max-height: 190px;
    resize: none;
  }

  body:not(.mobile-preview-mode) .json-input-group textarea {
    height: clamp(110px, 22vh, 170px);
    min-height: 110px;
    max-height: 170px;
  }

  body:not(.mobile-preview-mode) .prompt-actions {
    gap: 6px;
    align-self: start;
  }

  body:not(.mobile-preview-mode) .prompt-actions button {
    min-height: 50px;
    height: 52px;
  }

  body:not(.mobile-preview-mode) .question-image-picker span,
  body:not(.mobile-preview-mode) .question-image-preview {
    min-height: 42px;
    padding: 8px 11px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .flyai-lesson-status,
  body:not(.mobile-preview-mode) .json-error {
    min-height: 16px;
    line-height: 1.25;
  }

  body:not(.mobile-preview-mode) .topbar > .controls {
    margin-top: 10px;
    padding: 10px 12px 12px;
    gap: 6px;
    border-top: 1px solid var(--line);
  }

  body:not(.mobile-preview-mode) .topbar > .controls button {
    min-height: 32px;
    padding-inline: 8px;
  }

  body:not(.mobile-preview-mode) .speed-control {
    min-height: 34px;
  }

  body:not(.mobile-preview-mode) .stage-panel {
    grid-column: 2;
    grid-row: 1;
    height: 100dvh;
    min-height: 0;
    grid-template-rows: auto minmax(0, 1fr) 40px;
    gap: 12px;
    padding: 12px;
  }

  body:not(.mobile-preview-mode) #stage {
    width: min(100%, 900px, calc((100dvh - 174px) * 16 / 11));
    max-width: 100%;
    max-height: calc(100dvh - 174px);
  }

  body:not(.mobile-preview-mode) .timeline {
    min-height: 40px;
    padding-inline: 10px;
  }

  body:not(.mobile-preview-mode) .inspector {
    grid-column: 3;
    grid-row: 1;
    height: 100dvh;
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
    align-content: stretch;
    gap: 12px;
    overflow: hidden;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 14px;
  }

  body:not(.mobile-preview-mode) .tutor-question-section,
  body:not(.mobile-preview-mode) .lesson-summary-section {
    min-width: 0;
    padding: 14px;
  }

  body:not(.mobile-preview-mode) .inspector h2,
  body:not(.mobile-preview-mode) .inspector .tutor-question-section h2,
  body:not(.mobile-preview-mode) .inspector .lesson-summary-section h2 {
    margin-bottom: 10px;
    font-size: 18px;
  }

  body:not(.mobile-preview-mode) .tutor-question-form {
    gap: 6px;
  }

  body:not(.mobile-preview-mode) .tutor-question-form textarea {
    height: 78px;
    min-height: 78px;
    max-height: 78px;
    resize: none;
  }

  body:not(.mobile-preview-mode) .tutor-image-row {
    gap: 5px;
  }

  body:not(.mobile-preview-mode) .tutor-image-picker span,
  body:not(.mobile-preview-mode) .tutor-image-preview {
    min-height: 36px;
    padding: 7px 10px;
  }

  body:not(.mobile-preview-mode) .tutor-question-actions {
    gap: 6px;
  }

  body:not(.mobile-preview-mode) .tutor-question-actions button {
    min-height: 42px;
    padding-inline: 10px;
  }

  body:not(.mobile-preview-mode) .tutor-question-status {
    min-height: 14px;
    line-height: 1.2;
  }

  body:not(.mobile-preview-mode) .lesson-summary-section {
    min-height: 0;
    overflow: auto;
    scrollbar-width: thin;
  }

  body:not(.mobile-preview-mode) .lesson-summary {
    min-height: 0;
    gap: 10px;
    overflow: visible;
  }

  body:not(.mobile-preview-mode) .summary-group {
    gap: 8px;
  }

  body:not(.mobile-preview-mode) .summary-group h3 {
    font-size: 16px;
    line-height: 1.32;
  }

  body:not(.mobile-preview-mode) .summary-list {
    gap: 5px;
    padding-left: 20px;
    font-size: 16px;
    line-height: 1.5;
  }

  body:not(.mobile-preview-mode) .summary-answer {
    padding: 8px 0 8px 12px;
    font-size: 17px;
    line-height: 1.45;
  }

  body:not(.mobile-preview-mode) .debug-panel {
    grid-column: 1;
  }

  body:not(.mobile-preview-mode) .stage-loading-overlay {
    inset: 12px 12px 60px;
  }
}

/* Narrow desktop preview: keep the same one-screen contract inside Codex side-by-side panes. */
@media (min-width: 760px) and (max-width: 1180px) {
  body:not(.mobile-preview-mode) {
    height: 100dvh;
    overflow: hidden;
  }

  body:not(.mobile-preview-mode) .app-shell {
    height: 100dvh;
    min-height: 0;
    display: grid;
    grid-template-columns: clamp(210px, 26vw, 290px) minmax(0, 1fr) clamp(250px, 30vw, 350px);
    grid-template-rows: minmax(0, 1fr);
    flex-direction: initial;
  }

  body:not(.mobile-preview-mode) .topbar {
    grid-column: 1;
    grid-row: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--line);
    border-bottom: 0;
    overflow: hidden;
  }

  body:not(.mobile-preview-mode) .workspace {
    display: contents;
  }

  body:not(.mobile-preview-mode) .brand {
    min-height: 46px;
    padding: 10px;
    font-size: 17px;
  }

  body:not(.mobile-preview-mode) .brand-mark {
    width: 15px;
    height: 15px;
    border-radius: 4px;
  }

  body:not(.mobile-preview-mode) .promptbar {
    flex: 0 0 auto;
    min-height: 0;
    padding: 9px 10px;
    gap: 7px;
    align-content: start;
    grid-auto-rows: max-content;
  }

  body:not(.mobile-preview-mode) .promptbar textarea {
    height: 140px;
    min-height: 140px;
    max-height: 140px;
    resize: none;
    font-size: 14px;
    line-height: 1.45;
  }

  body:not(.mobile-preview-mode) .prompt-actions {
    align-self: start;
  }

  body:not(.mobile-preview-mode) .prompt-actions button {
    min-height: 44px;
    height: 46px;
    padding-inline: 8px;
    font-size: 14px;
    white-space: normal;
  }

  body:not(.mobile-preview-mode) .question-image-picker span,
  body:not(.mobile-preview-mode) .question-image-preview {
    min-height: 36px;
    padding: 6px 9px;
    font-size: 13px;
  }

  body:not(.mobile-preview-mode) .flyai-lesson-status,
  body:not(.mobile-preview-mode) .json-error {
    min-height: 14px;
    line-height: 1.2;
  }

  body:not(.mobile-preview-mode) .topbar > .controls {
    margin-top: 8px;
    padding: 8px 10px 10px;
    gap: 6px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 1px solid var(--line);
  }

  body:not(.mobile-preview-mode) .topbar > .controls button {
    min-height: 31px;
    padding-inline: 6px;
  }

  body:not(.mobile-preview-mode) .speed-control {
    min-height: 32px;
    grid-column: 1 / -1;
  }

  body:not(.mobile-preview-mode) .stage-panel > .controls {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
    padding: 8px;
  }

  body:not(.mobile-preview-mode) .stage-panel > .controls button {
    min-height: 44px;
    padding-inline: 8px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .stage-panel > .controls .speed-control {
    grid-column: 1 / -1;
    min-width: 0;
    min-height: 44px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .stage-panel {
    grid-column: 2;
    grid-row: 1;
    height: 100dvh;
    min-height: 0;
    grid-template-rows: auto minmax(0, 1fr) 38px;
    gap: 8px;
    padding: 8px;
  }

  body:not(.mobile-preview-mode) #stage {
    width: min(100%, 820px, calc((100dvh - 154px) * 16 / 11));
    max-height: calc(100dvh - 154px);
  }

  body:not(.mobile-preview-mode) .timeline {
    min-height: 38px;
    padding-inline: 8px;
  }

  body:not(.mobile-preview-mode) .inspector {
    grid-column: 3;
    grid-row: 1;
    height: 100dvh;
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
    gap: 8px;
    align-content: stretch;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 8px;
    overflow: hidden;
  }

  body:not(.mobile-preview-mode) .tutor-question-section,
  body:not(.mobile-preview-mode) .lesson-summary-section {
    padding: 10px;
  }

  body:not(.mobile-preview-mode) .inspector h2,
  body:not(.mobile-preview-mode) .inspector .tutor-question-section h2,
  body:not(.mobile-preview-mode) .inspector .lesson-summary-section h2 {
    margin-bottom: 8px;
    font-size: 15px;
  }

  body:not(.mobile-preview-mode) .tutor-question-form {
    gap: 5px;
  }

  body:not(.mobile-preview-mode) .tutor-question-form textarea {
    height: 68px;
    min-height: 68px;
    max-height: 68px;
    resize: none;
    font-size: 14px;
    line-height: 1.45;
  }

  body:not(.mobile-preview-mode) .tutor-image-row {
    gap: 5px;
  }

  body:not(.mobile-preview-mode) .tutor-image-picker span,
  body:not(.mobile-preview-mode) .tutor-image-preview {
    min-height: 32px;
    padding: 5px 8px;
  }

  body:not(.mobile-preview-mode) .tutor-question-actions {
    gap: 5px;
    grid-template-columns: 1fr;
  }

  body:not(.mobile-preview-mode) .tutor-question-actions button {
    min-height: 36px;
    padding-inline: 7px;
    font-size: 14px;
  }

  body:not(.mobile-preview-mode) .tutor-question-status {
    min-height: 13px;
    line-height: 1.18;
  }

  body:not(.mobile-preview-mode) .lesson-summary-section {
    min-height: 0;
    overflow: auto;
    scrollbar-width: thin;
  }

  body:not(.mobile-preview-mode) .lesson-summary {
    min-height: 0;
    gap: 8px;
    overflow: visible;
  }

  body:not(.mobile-preview-mode) .summary-group {
    gap: 3px;
  }

  body:not(.mobile-preview-mode) .summary-group h3 {
    font-size: 14px;
    line-height: 1.25;
  }

  body:not(.mobile-preview-mode) .summary-list {
    gap: 4px;
    padding-left: 18px;
    font-size: 14px;
    line-height: 1.42;
  }

  body:not(.mobile-preview-mode) .summary-answer {
    padding: 6px 0 6px 10px;
    font-size: 15px;
    line-height: 1.36;
  }

  body:not(.mobile-preview-mode) .stage-loading-overlay {
    inset: 8px 8px 54px;
  }
}