:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --surface-strong: #edf2f7;
  --line: #dfe5ec;
  --line-strong: #cbd5e1;
  --ink: #18202b;
  --ink-secondary: #475569;
  --ink-muted: #66758a;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --success: #16794a;
  --success-soft: #edf9f2;
  --warning: #a15c00;
  --warning-soft: #fff8e7;
  --danger: #b42318;
  --danger-soft: #fff2f0;
  --focus: 0 0 0 3px rgb(37 99 235 / 20%);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --mono: "SFMono-Regular", "SF Mono", Menlo, Monaco, Consolas, monospace;
  --radius-control: 8px;
  --radius-panel: 12px;
}

[hidden] {
  display: none !important;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

button,
input,
textarea {
  font: inherit;
}

button,
a,
input,
textarea {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 20;
  padding: 10px 14px;
  border-radius: var(--radius-control);
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.lab-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 10px clamp(16px, 3vw, 40px);
  border-bottom: 1px solid var(--line);
  background: rgb(255 255 255 / 96%);
  backdrop-filter: blur(10px);
}

.lab-brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 780;
  text-decoration: none;
}

.lab-brand img {
  width: 32px;
  height: 32px;
  border-radius: 7px;
}

.lab-brand small {
  overflow: hidden;
  color: var(--ink-muted);
  font-size: 13px;
  font-weight: 520;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lab-topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.auth-identity {
  color: var(--ink-muted);
  font-size: 13px;
}

.lab-main {
  width: min(1520px, 100%);
  margin: 0 auto;
  padding: 32px clamp(16px, 3vw, 40px) 64px;
}

.lab-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.75fr);
  gap: 48px;
  align-items: end;
  padding: 12px 0 28px;
}

.lab-context {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

.lab-intro h1 {
  max-width: 760px;
  margin: 0;
  font-size: 32px;
  font-weight: 780;
  letter-spacing: -0.025em;
  line-height: 1.22;
  text-wrap: balance;
}

.lab-intro > div > p:last-child {
  max-width: 72ch;
  margin: 14px 0 0;
  color: var(--ink-secondary);
  line-height: 1.75;
  text-wrap: pretty;
}

.lab-purpose {
  display: grid;
  gap: 16px;
  margin: 0;
  padding-left: 24px;
  border-left: 1px solid var(--line-strong);
}

.lab-purpose div {
  display: grid;
  gap: 4px;
}

.lab-purpose dt {
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
}

.lab-purpose dd {
  margin: 0;
  color: var(--ink-secondary);
  font-size: 13px;
  line-height: 1.65;
}

.auth-gate {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
}

.auth-gate h2 {
  margin: 0;
  font-size: 21px;
}

.auth-gate p {
  max-width: 65ch;
  margin: 8px 0 20px;
  color: var(--ink-secondary);
}

.lab-workspace {
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.lab-input-panel,
.lab-output {
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface);
}

.lab-input-panel {
  position: sticky;
  top: 88px;
  max-height: calc(100dvh - 112px);
  overflow: auto;
  padding: 22px;
}

.lab-output {
  min-height: 720px;
  padding: 22px;
}

.section-heading,
.output-toolbar,
.question-browser-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.section-heading h2,
.output-toolbar h2 {
  margin: 0;
  font-size: 19px;
  line-height: 1.35;
}

.section-heading p,
.output-toolbar p,
.question-browser-head p {
  margin: 5px 0 0;
  color: var(--ink-muted);
  font-size: 12.5px;
  line-height: 1.65;
}

.text-button {
  min-height: 36px;
  padding: 4px 8px;
  border: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font-weight: 650;
}

#probeForm {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.field {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.field label,
.fieldset legend {
  color: var(--ink);
  font-size: 13px;
  font-weight: 680;
}

.field label > span[aria-hidden] {
  color: var(--danger);
}

.field input,
.field textarea,
.question-search input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.field input,
.question-search input {
  padding: 0 12px;
}

.field textarea {
  min-height: 76px;
  padding: 10px 12px;
  resize: vertical;
}

.field input:hover,
.field textarea:hover,
.question-search input:hover {
  border-color: #94a3b8;
}

.field input:focus,
.field textarea:focus,
.question-search input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: var(--focus);
}

.field input::placeholder,
.field textarea::placeholder,
.question-search input::placeholder {
  color: #64748b;
  opacity: 1;
}

.field input:disabled,
.field textarea:disabled {
  border-color: var(--line);
  background: var(--surface-subtle);
  color: var(--ink-muted);
  cursor: not-allowed;
}

.field-help,
.field-error {
  margin: 0;
  font-size: 12px;
}

.field-help {
  color: var(--ink-muted);
}

.field-error {
  color: var(--danger);
  font-weight: 620;
}

.fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.product-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.product-fields label {
  display: grid;
  gap: 5px;
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 600;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border-radius: var(--radius-control);
  cursor: pointer;
  font-weight: 680;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 120ms ease;
  white-space: nowrap;
}

.button:active:not(:disabled) {
  transform: translateY(1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

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

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

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

.button-secondary:hover:not(:disabled) {
  border-color: #94a3b8;
  background: var(--surface-subtle);
}

.button-generate {
  width: 100%;
}

.submit-note {
  margin: -8px 0 0;
  color: var(--ink-muted);
  font-size: 12px;
  line-height: 1.6;
}

.output-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.empty-state {
  display: grid;
  min-height: 520px;
  place-content: center;
  justify-items: center;
  padding: 32px;
  color: var(--ink-secondary);
  text-align: center;
}

.empty-state strong {
  color: var(--ink);
  font-size: 18px;
}

.empty-state p {
  max-width: 46ch;
  margin: 8px 0 0;
  line-height: 1.7;
}

.progress-panel {
  margin-top: 22px;
  padding: 22px;
  border-radius: var(--radius-panel);
  background: var(--surface-subtle);
}

.progress-copy {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.progress-copy > div {
  display: grid;
  gap: 3px;
}

.progress-copy span {
  color: var(--ink-muted);
  font-size: 12px;
}

.progress-copy strong {
  font-size: 15px;
  font-weight: 700;
}

#progressPercent {
  color: var(--primary);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
}

.progress-track {
  height: 5px;
  margin-top: 18px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-strong);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
  transition: width 220ms ease-out;
}

.stage-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.stage-list li {
  padding: 7px 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  color: var(--ink-muted);
  font-size: 11px;
  text-align: center;
}

.stage-list li.is-current {
  border-color: #bfdbfe;
  background: var(--primary-soft);
  color: #1d4ed8;
  font-weight: 680;
}

.stage-list li.is-complete {
  color: var(--success);
}

.error-panel {
  margin-top: 22px;
  padding: 22px;
  border: 1px solid #f2b8b5;
  border-radius: var(--radius-panel);
  background: var(--danger-soft);
}

.error-panel h3 {
  margin: 0;
  color: var(--danger);
  font-size: 18px;
}

.error-panel p {
  max-width: 76ch;
  margin: 8px 0 18px;
  color: #7a271a;
  line-height: 1.7;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.error-panel pre {
  max-height: 320px;
  margin: 16px 0 0;
  overflow: auto;
  padding: 14px;
  border-radius: var(--radius-control);
  background: #2b1b1a;
  color: #ffe9e6;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

#resultArea {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.quality-overview,
.boundary-panel,
.question-browser {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
}

.quality-heading h3,
.boundary-panel h3,
.question-browser h3 {
  margin: 0;
  font-size: 17px;
}

.quality-heading p {
  margin: 4px 0 0;
  color: var(--ink-muted);
  font-size: 12px;
}

.status-label {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--ink-secondary);
  font-size: 12px;
  font-weight: 700;
}

.status-label.is-pass {
  background: var(--success-soft);
  color: var(--success);
}

.status-label.is-warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  background: var(--line);
}

.metric {
  min-width: 0;
  padding: 12px;
  background: var(--surface);
}

.metric span {
  display: block;
  color: var(--ink-muted);
  font-size: 11px;
}

.metric strong {
  display: block;
  overflow: hidden;
  margin-top: 4px;
  font-family: var(--mono);
  font-size: 17px;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.check-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.check-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px 12px;
  border-radius: var(--radius-control);
  background: var(--surface-subtle);
}

.check-mark {
  display: inline-flex;
  width: 22px;
  height: 22px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--success-soft);
  color: var(--success);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
}

.check-item.is-warning .check-mark {
  background: var(--warning-soft);
  color: var(--warning);
}

.check-item strong {
  display: block;
  font-size: 13px;
}

.check-item p {
  margin: 2px 0 0;
  color: var(--ink-muted);
  font-size: 11.5px;
  line-height: 1.55;
}

.boundary-panel {
  background: var(--surface-subtle);
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.boundary-item {
  padding: 12px 14px;
  border-radius: var(--radius-control);
  background: var(--surface);
}

.boundary-item strong {
  display: block;
  font-size: 13px;
}

.boundary-item p {
  margin: 5px 0 0;
  color: var(--ink-secondary);
  font-size: 12px;
  line-height: 1.65;
}

.question-browser-head {
  align-items: end;
}

.question-search {
  display: grid;
  width: min(340px, 100%);
  gap: 5px;
}

.question-search label {
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 650;
}

.filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
  padding: 10px;
  border-radius: var(--radius-control);
  background: var(--surface-subtle);
}

.segmented-control {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.segmented-control button {
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--ink-secondary);
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
}

.segmented-control button:hover {
  background: var(--surface);
}

.segmented-control button[aria-pressed="true"] {
  border-color: var(--line);
  background: var(--surface);
  color: var(--primary);
}

.question-list {
  display: grid;
  gap: 0;
  margin-top: 14px;
}

.question-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 13px 4px;
  border-bottom: 1px solid var(--line);
}

.question-row:last-child {
  border-bottom: 0;
}

.question-index {
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 11px;
}

.question-copy {
  min-width: 0;
}

.question-copy strong {
  display: block;
  color: var(--ink);
  font-size: 14px;
  font-weight: 620;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin-top: 5px;
  color: var(--ink-muted);
  font-size: 11px;
}

.question-state {
  padding-top: 1px;
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.question-state.is-non-named {
  color: var(--ink-muted);
}

.filter-empty {
  margin: 22px 0 0;
  color: var(--ink-muted);
  text-align: center;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 30;
  max-width: min(380px, calc(100vw - 40px));
  padding: 12px 15px;
  border-radius: var(--radius-control);
  background: var(--ink);
  color: #fff;
  font-size: 13px;
}

@media (max-width: 1120px) {
  .lab-intro {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .lab-purpose {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 16px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

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

  .lab-input-panel {
    position: static;
    max-height: none;
  }
}

@media (max-width: 720px) {
  .lab-topbar {
    min-height: 58px;
    padding: 8px 14px;
  }

  .lab-brand small,
  .auth-identity {
    display: none;
  }

  .lab-topbar-actions .button {
    min-height: 40px;
    padding: 8px 10px;
    font-size: 12px;
  }

  .lab-main {
    padding: 20px 14px 40px;
  }

  .lab-intro {
    padding-bottom: 20px;
  }

  .lab-intro h1 {
    font-size: 25px;
  }

  .lab-purpose {
    grid-template-columns: 1fr;
  }

  .lab-input-panel,
  .lab-output {
    padding: 16px;
  }

  .product-fields {
    grid-template-columns: 1fr;
  }

  .output-toolbar,
  .question-browser-head {
    align-items: stretch;
    flex-direction: column;
  }

  .output-actions,
  .output-actions .button,
  .question-search {
    width: 100%;
  }

  .stage-list {
    grid-template-columns: 1fr;
  }

  .stage-list li {
    display: none;
    text-align: left;
  }

  .stage-list li.is-current {
    display: block;
  }

  .filter-row {
    align-items: stretch;
    flex-direction: column;
  }

  .question-row {
    grid-template-columns: 58px minmax(0, 1fr);
  }

  .question-state {
    grid-column: 2;
    padding: 0;
  }
}

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

  .lab-topbar {
    backdrop-filter: none;
  }
}