[data-tool-root="black-level-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;
  --success: #276749;
  --danger: #a12424;
  --focus-ring: rgba(17, 17, 17, 0.35);
  box-sizing: border-box;
  width: 100%;
  padding: 0 360px 40px 30px;
  color: var(--gray-900);
  font-family: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

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

[data-tool-root="black-level-test"] .tool-page-header {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--gray-300);
}

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

[data-tool-root="black-level-test"] .page-description {
  max-width: 72ch;
  margin: var(--space-sm) 0 0;
  color: var(--gray-700);
}

[data-tool-root="black-level-test"] .tool-workspace {
  margin-top: var(--space-xl);
  padding: var(--space-xl);
  background: var(--gray-150);
  border: 1px solid var(--gray-300);
  border-radius: 6px;
}

[data-tool-root="black-level-test"] .workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  gap: var(--space-lg);
  align-items: start;
}

[data-tool-root="black-level-test"] .input-panel,
[data-tool-root="black-level-test"] .result-summary,
[data-tool-root="black-level-test"] .insight-card,
[data-tool-root="black-level-test"] .acc {
  background: #ffffff;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
}

[data-tool-root="black-level-test"] .input-panel,
[data-tool-root="black-level-test"] .result-summary,
[data-tool-root="black-level-test"] .insight-card {
  padding: var(--space-xl);
}

[data-tool-root="black-level-test"] .panel-label,
[data-tool-root="black-level-test"] .result-summary-eyebrow {
  margin: 0;
  font-weight: 700;
}

[data-tool-root="black-level-test"] .controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

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

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

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

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

[data-tool-root="black-level-test"] input[type="number"],
[data-tool-root="black-level-test"] select,
[data-tool-root="black-level-test"] textarea {
  width: 100%;
  min-height: 42px;
  padding: 9px 10px;
  color: var(--gray-900);
  background: #ffffff;
  border: 1px solid var(--gray-500);
  border-radius: 4px;
}

[data-tool-root="black-level-test"] input[type="range"] {
  width: 100%;
  accent-color: var(--gray-900);
}

[data-tool-root="black-level-test"] .range-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 52px;
  gap: var(--space-md);
  align-items: center;
}

[data-tool-root="black-level-test"] .range-control output {
  min-width: 52px;
  padding: 6px 8px;
  text-align: center;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-radius: 4px;
}

[data-tool-root="black-level-test"] .input-with-suffix {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

[data-tool-root="black-level-test"] .input-with-suffix input {
  border-radius: 4px 0 0 4px;
}

[data-tool-root="black-level-test"] .input-with-suffix span {
  min-height: 42px;
  padding: 9px 12px;
  background: var(--gray-100);
  border: 1px solid var(--gray-500);
  border-left: 0;
  border-radius: 0 4px 4px 0;
}

[data-tool-root="black-level-test"] .field-help,
[data-tool-root="black-level-test"] .keyboard-help,
[data-tool-root="black-level-test"] .result-summary-note,
[data-tool-root="black-level-test"] .visual-conclusion {
  margin: var(--space-sm) 0 0;
  color: var(--gray-600);
}

[data-tool-root="black-level-test"] .field-error {
  margin: var(--space-sm) 0 0;
  color: var(--danger);
  font-weight: 700;
}

[data-tool-root="black-level-test"] [aria-invalid="true"] {
  border-color: var(--danger);
}

[data-tool-root="black-level-test"] .test-stage {
  position: relative;
  width: 100%;
  min-height: 300px;
  margin-top: var(--space-xl);
  overflow: hidden;
  background: #000000;
  border: 1px solid var(--gray-800);
  border-radius: 4px;
}

[data-tool-root="black-level-test"] .test-stage canvas {
  display: block;
  width: 100%;
  height: 300px;
}

[data-tool-root="black-level-test"] .test-stage:fullscreen {
  width: 100vw;
  height: 100vh;
  min-height: 100vh;
  border: 0;
  border-radius: 0;
}

[data-tool-root="black-level-test"] .test-stage:fullscreen canvas {
  width: 100vw;
  height: 100vh;
}

[data-tool-root="black-level-test"] .button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

[data-tool-root="black-level-test"] .btn {
  min-height: 42px;
  padding: 9px 14px;
  color: var(--gray-900);
  background: #ffffff;
  border: 1px solid var(--gray-800);
  border-radius: 4px;
  cursor: pointer;
}

[data-tool-root="black-level-test"] .btn:hover {
  background: var(--gray-200);
}

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

[data-tool-root="black-level-test"] .btn-primary:hover {
  background: var(--gray-800);
}

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

[data-tool-root="black-level-test"] .status-line {
  min-height: 26px;
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--gray-300);
}

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

[data-tool-root="black-level-test"] .result-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 3px 10px;
  font-size: 13px;
  font-weight: 700;
  border: 1px solid var(--gray-500);
  border-radius: 999px;
}

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

[data-tool-root="black-level-test"] .result-summary[data-state="invalid"] .result-badge {
  color: var(--danger);
  border-color: var(--danger);
}

[data-tool-root="black-level-test"] .result-primary {
  margin-top: var(--space-xl);
}

[data-tool-root="black-level-test"] .result-primary-label,
[data-tool-root="black-level-test"] .result-primary-secondary {
  display: block;
}

[data-tool-root="black-level-test"] .result-primary-label {
  color: var(--gray-600);
}

[data-tool-root="black-level-test"] .result-primary-value {
  display: block;
  overflow-wrap: anywhere;
  margin: var(--space-xs) 0;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}

[data-tool-root="black-level-test"] .result-primary-secondary {
  color: var(--gray-700);
}

[data-tool-root="black-level-test"] .result-data-band {
  margin: var(--space-xl) 0 0;
  border-top: 1px solid var(--gray-300);
}

[data-tool-root="black-level-test"] .result-data-band div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--gray-300);
}

[data-tool-root="black-level-test"] .result-data-band dt {
  color: var(--gray-600);
}

[data-tool-root="black-level-test"] .result-data-band dd {
  margin: 0;
  text-align: right;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

[data-tool-root="black-level-test"] .copy-fallback {
  margin-top: var(--space-lg);
}

[data-tool-root="black-level-test"] .copy-fallback textarea {
  resize: vertical;
}

[data-tool-root="black-level-test"] .desc-section {
  margin-top: var(--space-2xl);
}

[data-tool-root="black-level-test"] .desc-section h2 {
  margin: 0 0 var(--space-lg);
  padding-left: 10px;
  font-size: 24px;
  line-height: 1.3;
  border-left: 3px solid var(--gray-900);
}

[data-tool-root="black-level-test"] .level-axis {
  padding: var(--space-md) 0;
}

[data-tool-root="black-level-test"] .level-axis-track {
  position: relative;
  height: 16px;
  background: var(--gray-900);
  border: 1px solid var(--gray-500);
  border-radius: 999px;
}

[data-tool-root="black-level-test"] .level-axis-marker {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 30px;
  transform: translate(-50%, -50%);
  background: #ffffff;
  border: 3px solid var(--gray-900);
  border-radius: 999px;
}

[data-tool-root="black-level-test"] .level-axis-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-sm);
  color: var(--gray-600);
  font-variant-numeric: tabular-nums;
}

[data-tool-root="black-level-test"] .interpretation-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

[data-tool-root="black-level-test"] .interpretation-grid article {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--gray-300);
}

[data-tool-root="black-level-test"] .interpretation-grid h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.4;
}

[data-tool-root="black-level-test"] .interpretation-grid p {
  margin: var(--space-sm) 0 0;
}

[data-tool-root="black-level-test"] .accordion-group {
  display: grid;
  gap: var(--space-md);
}

[data-tool-root="black-level-test"] .acc summary {
  padding: var(--space-lg);
  font-weight: 700;
  cursor: pointer;
}

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

[data-tool-root="black-level-test"] .acc-panel p {
  margin: var(--space-sm) 0 0;
}

[data-tool-root="black-level-test"] :focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

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

@media (max-width: 720px) {
  [data-tool-root="black-level-test"] .workspace-grid,
  [data-tool-root="black-level-test"] .interpretation-grid {
    grid-template-columns: 1fr;
  }

  [data-tool-root="black-level-test"] .controls-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 430px) {
  [data-tool-root="black-level-test"] .tool-workspace,
  [data-tool-root="black-level-test"] .input-panel,
  [data-tool-root="black-level-test"] .result-summary,
  [data-tool-root="black-level-test"] .insight-card {
    padding: 14px;
  }

  [data-tool-root="black-level-test"] .button-row-levels .btn {
    width: 100%;
  }

  [data-tool-root="black-level-test"] .result-data-band div {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  [data-tool-root="black-level-test"] .result-data-band dd {
    text-align: left;
  }
}

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