[data-tool-root="backlight-bleed-test"] {
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 32px;
  --gray-100: #f7f7f7;
  --gray-150: #f2f2f2;
  --gray-200: #eeeeee;
  --gray-300: #dddddd;
  --gray-500: #999999;
  --gray-600: #666666;
  --gray-700: #444444;
  --gray-800: #222222;
  --gray-900: #111111;
  --bg-canvas: #ffffff;
  --bg-workspace: #f2f2f2;
  --bg-result-surface: #ffffff;
  --text-primary: #111111;
  --text-secondary: #444444;
  --text-tertiary: #666666;
  --border: #dddddd;
  --border-strong: #222222;
  --success: #276749;
  --danger: #a12424;
  --focus-ring: rgba(17, 17, 17, 0.35);
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  padding: 0 360px 0 30px;
  color: var(--text-primary);
  background: var(--bg-canvas);
  font-family: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.65;
}

[data-tool-root="backlight-bleed-test"] *,
[data-tool-root="backlight-bleed-test"] *::before,
[data-tool-root="backlight-bleed-test"] *::after {
  box-sizing: border-box;
}

[data-tool-root="backlight-bleed-test"] .tool-page-header {
  padding: 0 0 var(--space-xl);
  border-bottom: 1px solid var(--border);
}

[data-tool-root="backlight-bleed-test"] .tool-page-header h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.5px;
}

[data-tool-root="backlight-bleed-test"] .page-description {
  max-width: 72ch;
  margin: var(--space-sm) 0 0;
  color: var(--text-secondary);
}

[data-tool-root="backlight-bleed-test"] .tool-workspace,
[data-tool-root="backlight-bleed-test"] .desc-section,
[data-tool-root="backlight-bleed-test"] .related-tools {
  margin-top: var(--space-xl);
}

[data-tool-root="backlight-bleed-test"] .workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: stretch;
  gap: var(--space-lg);
}

[data-tool-root="backlight-bleed-test"] .input-panel,
[data-tool-root="backlight-bleed-test"] .result-panel {
  min-width: 0;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-workspace);
  border: 1px solid var(--border);
  border-radius: 6px;
}

[data-tool-root="backlight-bleed-test"] .panel-label,
[data-tool-root="backlight-bleed-test"] .result-summary-eyebrow {
  display: block;
  margin: 0 0 var(--space-md);
  font-weight: 700;
}

[data-tool-root="backlight-bleed-test"] .controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

[data-tool-root="backlight-bleed-test"] .field,
[data-tool-root="backlight-bleed-test"] .field-wide {
  min-width: 0;
}

[data-tool-root="backlight-bleed-test"] .field-wide {
  grid-column: 1 / -1;
}

[data-tool-root="backlight-bleed-test"] .field label,
[data-tool-root="backlight-bleed-test"] .copy-fallback label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 700;
}

[data-tool-root="backlight-bleed-test"] input,
[data-tool-root="backlight-bleed-test"] select,
[data-tool-root="backlight-bleed-test"] textarea,
[data-tool-root="backlight-bleed-test"] button {
  font: inherit;
}

[data-tool-root="backlight-bleed-test"] input,
[data-tool-root="backlight-bleed-test"] select,
[data-tool-root="backlight-bleed-test"] textarea {
  width: 100%;
  min-height: 44px;
  padding: 9px 10px;
  color: var(--text-primary);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-variant-numeric: tabular-nums;
}

[data-tool-root="backlight-bleed-test"] textarea {
  resize: vertical;
}

[data-tool-root="backlight-bleed-test"] input[aria-invalid="true"],
[data-tool-root="backlight-bleed-test"] select[aria-invalid="true"] {
  border-color: var(--danger);
}

[data-tool-root="backlight-bleed-test"] input:focus-visible,
[data-tool-root="backlight-bleed-test"] select:focus-visible,
[data-tool-root="backlight-bleed-test"] textarea:focus-visible,
[data-tool-root="backlight-bleed-test"] button:focus-visible,
[data-tool-root="backlight-bleed-test"] summary:focus-visible,
[data-tool-root="backlight-bleed-test"] a:focus-visible {
  outline: 2px solid var(--gray-900);
  outline-offset: 3px;
}

[data-tool-root="backlight-bleed-test"] .field-help,
[data-tool-root="backlight-bleed-test"] .field-error {
  margin: var(--space-xs) 0 0;
}

[data-tool-root="backlight-bleed-test"] .field-help {
  color: var(--text-tertiary);
}

[data-tool-root="backlight-bleed-test"] .field-error {
  color: var(--danger);
  font-weight: 700;
}

[data-tool-root="backlight-bleed-test"] .test-surface {
  display: grid;
  min-height: 230px;
  margin-top: var(--space-lg);
  place-items: center;
  overflow: hidden;
  color: #ffffff;
  background: #000000;
  border: 1px solid var(--gray-700);
  border-radius: 4px;
}

[data-tool-root="backlight-bleed-test"] .test-surface-hint {
  max-width: 34ch;
  padding: var(--space-md);
  text-align: center;
  background: rgba(0, 0, 0, 0.72);
}

[data-tool-root="backlight-bleed-test"] .test-surface:fullscreen,
[data-tool-root="backlight-bleed-test"] .test-surface:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  min-height: 100vh;
  border: 0;
  border-radius: 0;
  cursor: none;
}

[data-tool-root="backlight-bleed-test"] .test-surface:fullscreen .test-surface-hint,
[data-tool-root="backlight-bleed-test"] .test-surface:-webkit-full-screen .test-surface-hint {
  display: none;
}

[data-tool-root="backlight-bleed-test"] .button-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

[data-tool-root="backlight-bleed-test"] .button-row-secondary {
  margin-top: var(--space-sm);
}

[data-tool-root="backlight-bleed-test"] .btn {
  min-height: 44px;
  padding: 9px 14px;
  color: var(--text-primary);
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  cursor: pointer;
}

[data-tool-root="backlight-bleed-test"] .btn:hover:not(:disabled) {
  background: var(--gray-200);
}

[data-tool-root="backlight-bleed-test"] .btn-primary {
  color: #ffffff;
  background: var(--gray-900);
}

[data-tool-root="backlight-bleed-test"] .btn-primary:hover:not(:disabled) {
  background: var(--gray-800);
}

[data-tool-root="backlight-bleed-test"] .btn:disabled {
  color: var(--gray-500);
  background: var(--gray-200);
  border-color: var(--gray-300);
  cursor: not-allowed;
}

[data-tool-root="backlight-bleed-test"] .region-recorder {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

[data-tool-root="backlight-bleed-test"] .region-recorder h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.3;
}

[data-tool-root="backlight-bleed-test"] .region-recorder p {
  margin: var(--space-sm) 0 var(--space-md);
  color: var(--text-secondary);
}

[data-tool-root="backlight-bleed-test"] .region-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(44px, 1fr));
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #111111;
  border: 1px solid var(--gray-700);
  border-radius: 4px;
}

[data-tool-root="backlight-bleed-test"] .region-button {
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  color: #ffffff;
  background: #111111;
  border: 0;
  border-right: 1px solid #444444;
  border-bottom: 1px solid #444444;
  border-radius: 0;
  cursor: pointer;
}

[data-tool-root="backlight-bleed-test"] .region-button:nth-child(4n) {
  border-right: 0;
}

[data-tool-root="backlight-bleed-test"] .region-button:nth-child(n + 13) {
  border-bottom: 0;
}

[data-tool-root="backlight-bleed-test"] .region-button[aria-pressed="true"] {
  background: #4b1f1f;
  outline: 3px solid #ffffff;
  outline-offset: -4px;
}

[data-tool-root="backlight-bleed-test"] .region-button[aria-pressed="true"]::after {
  content: "×";
  font-size: 24px;
  font-weight: 700;
}

[data-tool-root="backlight-bleed-test"] .status-line {
  min-height: 1.65em;
  margin-top: var(--space-md);
  color: var(--text-secondary);
}

[data-tool-root="backlight-bleed-test"] .status-line[data-status="error"] {
  color: var(--danger);
  font-weight: 700;
}

[data-tool-root="backlight-bleed-test"] .result-panel {
  display: flex;
}

[data-tool-root="backlight-bleed-test"] .result-summary {
  display: flex;
  width: 100%;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--bg-result-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

[data-tool-root="backlight-bleed-test"] .result-summary-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

[data-tool-root="backlight-bleed-test"] .result-badge {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 2px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-weight: 700;
}

[data-tool-root="backlight-bleed-test"] .result-summary[data-state="success"] .result-badge {
  color: var(--success);
  border-color: var(--success);
}

[data-tool-root="backlight-bleed-test"] .result-summary[data-state="danger"] .result-badge,
[data-tool-root="backlight-bleed-test"] .result-summary[data-state="warning"] .result-badge {
  color: var(--danger);
  border-color: var(--danger);
}

[data-tool-root="backlight-bleed-test"] .result-primary {
  display: grid;
  gap: var(--space-xs);
  margin-top: var(--space-xl);
}

[data-tool-root="backlight-bleed-test"] .result-primary-label,
[data-tool-root="backlight-bleed-test"] .result-primary-secondary {
  color: var(--text-secondary);
}

[data-tool-root="backlight-bleed-test"] .result-primary-value {
  overflow-wrap: anywhere;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

[data-tool-root="backlight-bleed-test"] .result-data-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: var(--space-xl) 0 0;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

[data-tool-root="backlight-bleed-test"] .result-data-band div {
  min-width: 0;
  padding: var(--space-md);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

[data-tool-root="backlight-bleed-test"] .result-data-band dt {
  color: var(--text-tertiary);
}

[data-tool-root="backlight-bleed-test"] .result-data-band dd {
  margin: var(--space-xs) 0 0;
  overflow-wrap: anywhere;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

[data-tool-root="backlight-bleed-test"] .result-summary-note {
  margin: var(--space-lg) 0 0;
  padding: var(--space-md);
  color: var(--text-secondary);
  background: var(--gray-100);
  border-left: 3px solid var(--gray-800);
}

[data-tool-root="backlight-bleed-test"] .copy-fallback {
  margin-top: var(--space-md);
}

[data-tool-root="backlight-bleed-test"] .desc-section h2,
[data-tool-root="backlight-bleed-test"] .related-tools h2 {
  margin: 0 0 var(--space-md);
  padding-left: var(--space-md);
  font-size: 24px;
  line-height: 1.3;
  border-left: 3px solid var(--gray-900);
}

[data-tool-root="backlight-bleed-test"] .card-block {
  padding: var(--space-xl);
  background: var(--gray-100);
  border: 1px solid var(--border);
  border-radius: 6px;
}

[data-tool-root="backlight-bleed-test"] .visual-card h3 {
  margin: 0 0 var(--space-md);
  font-size: 18px;
}

[data-tool-root="backlight-bleed-test"] .visual-card svg {
  display: block;
  width: 100%;
  height: auto;
  min-height: 220px;
  color: var(--text-secondary);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 4px;
}

[data-tool-root="backlight-bleed-test"] .visual-card svg text {
  fill: currentColor;
  font-family: "Noto Sans SC", system-ui, sans-serif;
}

[data-tool-root="backlight-bleed-test"] .visual-card svg .visual-marker {
  fill: #ffffff;
}

[data-tool-root="backlight-bleed-test"] .visual-card p {
  margin: var(--space-md) 0 0;
}

[data-tool-root="backlight-bleed-test"] .acc {
  border-top: 1px solid var(--border);
}

[data-tool-root="backlight-bleed-test"] .acc:first-child {
  border-top: 0;
}

[data-tool-root="backlight-bleed-test"] .acc summary {
  padding: var(--space-md) 0;
  font-weight: 700;
  cursor: pointer;
}

[data-tool-root="backlight-bleed-test"] .acc-panel {
  padding: 0 0 var(--space-lg);
}

[data-tool-root="backlight-bleed-test"] .acc-panel > :first-child {
  margin-top: 0;
}

[data-tool-root="backlight-bleed-test"] .acc-panel > :last-child {
  margin-bottom: 0;
}

[data-tool-root="backlight-bleed-test"] .faq-group {
  border-top: 1px solid var(--border);
}

[data-tool-root="backlight-bleed-test"] .source-list,
[data-tool-root="backlight-bleed-test"] .acc-panel ol {
  padding-left: 22px;
}

[data-tool-root="backlight-bleed-test"] .source-list a,
[data-tool-root="backlight-bleed-test"] .related-links a {
  color: var(--text-primary);
  text-underline-offset: 3px;
}

[data-tool-root="backlight-bleed-test"] .related-tools-accordion {
  padding: 0 var(--space-xl);
  background: var(--gray-100);
  border: 1px solid var(--border);
  border-radius: 6px;
}

[data-tool-root="backlight-bleed-test"] .related-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm) var(--space-lg);
}

[data-tool-root="backlight-bleed-test"] .category-link {
  grid-column: 1 / -1;
}

@media (max-width: 900px) {
  [data-tool-root="backlight-bleed-test"] {
    padding-right: 8px;
    padding-left: 8px;
  }
}

@media (max-width: 720px) {
  [data-tool-root="backlight-bleed-test"] .workspace-grid,
  [data-tool-root="backlight-bleed-test"] .controls-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  [data-tool-root="backlight-bleed-test"] .input-panel,
  [data-tool-root="backlight-bleed-test"] .result-panel,
  [data-tool-root="backlight-bleed-test"] .card-block {
    padding: 14px 12px;
  }

  [data-tool-root="backlight-bleed-test"] .field-wide {
    grid-column: auto;
  }
}

@media (max-width: 430px) {
  [data-tool-root="backlight-bleed-test"] .button-row,
  [data-tool-root="backlight-bleed-test"] .result-data-band,
  [data-tool-root="backlight-bleed-test"] .related-links {
    grid-template-columns: 1fr;
  }

  [data-tool-root="backlight-bleed-test"] .category-link {
    grid-column: auto;
  }

  [data-tool-root="backlight-bleed-test"] .tool-page-header h1 {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  [data-tool-root="backlight-bleed-test"] *,
  [data-tool-root="backlight-bleed-test"] *::before,
  [data-tool-root="backlight-bleed-test"] *::after {
    scroll-behavior: auto;
    transition: none;
    animation: none;
  }
}