body.identifier-page {
  color-scheme: light;

  /* 配色 */
  --identifier-page: #f4f6f8;
  --identifier-surface: #ffffff;
  --identifier-surface-soft: #f6f8fa;
  --identifier-border: #d0d7de;
  --identifier-text: #1f2328;
  --identifier-muted: #57606a;
  --identifier-accent: #0969da;
  --identifier-accent-hover: #0757b5;
  --identifier-success: #1a7f37;
  --identifier-success-bg: #dafbe1;
  --identifier-warning: #9a6700;
  --identifier-warning-bg: #fff8c5;
  --identifier-danger: #cf222e;
  --identifier-danger-bg: #ffebe9;
  --identifier-notice-text: #0550ae;
  --identifier-notice-bg: #ddf4ff;
  --identifier-notice-border: #b6e3ff;
  --identifier-focus-ring: rgba(9, 105, 218, 0.24);
  --identifier-shadow: 0 14px 36px rgba(31, 35, 40, 0.07);

  /* 形状とサイズ */
  --identifier-radius: 12px;
  --identifier-control-radius: 8px;
  --identifier-table-radius: 9px;
  --identifier-card-radius: 10px;
  --identifier-control-height: 39px;
  --identifier-panel-padding: 18px;
  --identifier-content-width: 1380px;
  --identifier-page-gutter: 32px;
  --identifier-page-gutter-mobile: 24px;
  --identifier-gap-small: 8px;
  --identifier-gap-compact: 10px;
  --identifier-gap: 12px;
  --identifier-gap-large: 16px;
  --identifier-output-height: 220px;
  --identifier-validation-height: 140px;

  /* コード表示の文字設定 */
  --identifier-code-size: 13px;
  --identifier-table-code-size: 12px;
  --identifier-code-font: "Cascadia Code", Consolas, monospace;

  /* UUIDを既定値とし、GUIDページでは必要な列数だけを上書きする。 */
  --identifier-settings-columns-wide: repeat(5, minmax(170px, 1fr));
  --identifier-settings-columns-tablet: repeat(3, minmax(170px, 1fr));
  --identifier-special-columns: repeat(2, minmax(0, 1fr));

  min-block-size: 100vh;
  margin: 0;
  color: var(--identifier-text);
  background: var(--identifier-page);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.identifier-page,
.identifier-page * {
  box-sizing: border-box;
}

.identifier-main {
  inline-size: min(var(--identifier-content-width), calc(100% - var(--identifier-page-gutter)));
  margin-inline: auto;
  padding-block: 38px;
}

.identifier-page-header {
  margin-block-end: 18px;
}

.identifier-page-header h1 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
}

.identifier-page-header > p,
.identifier-panel-description {
  margin-block: 7px 0;
  color: var(--identifier-muted);
  line-height: 1.65;
}

.identifier-page .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--identifier-gap-small);
  margin-block-end: 12px;
  color: var(--identifier-muted);
  font-size: 0.9rem;
}

.identifier-page a {
  color: var(--identifier-accent);
  font-weight: 700;
  text-decoration: none;
}

.identifier-page a:is(:hover, :focus-visible) {
  text-decoration: underline;
}

.identifier-notice,
.identifier-panel {
  margin-block-end: 16px;
  border: 1px solid var(--identifier-border);
  border-radius: var(--identifier-radius);
  background: var(--identifier-surface);
  box-shadow: var(--identifier-shadow);
}

.identifier-notice {
  padding: 12px 14px;
  border-color: var(--identifier-notice-border);
  color: var(--identifier-notice-text);
  background: var(--identifier-notice-bg);
  line-height: 1.65;
}

.identifier-panel {
  padding: var(--identifier-panel-padding);
}

.identifier-panel-heading {
  margin-block-end: 14px;
}

.identifier-panel-heading--actions,
.identifier-actions,
.identifier-list-heading,
.identifier-pagination {
  display: flex;
  align-items: center;
}

.identifier-panel-heading--actions,
.identifier-list-heading {
  justify-content: space-between;
  gap: var(--identifier-gap-large);
}

.identifier-panel :is(h2, h3) {
  margin-block-start: 0;
}

.identifier-panel-title {
  margin-block-end: 0;
  font-size: 1.1rem;
}

.identifier-field {
  display: grid;
  align-content: start;
  gap: 6px;
  color: var(--identifier-muted);
  font-weight: 700;
}

.identifier-control,
.identifier-button {
  border: 1px solid var(--identifier-border);
  border-radius: var(--identifier-control-radius);
  color: var(--identifier-text);
  background: var(--identifier-surface);
  font: inherit;
}

.identifier-control:is(input, select) {
  inline-size: 100%;
  min-block-size: var(--identifier-control-height);
  padding: 7px 10px;
}

.identifier-button {
  min-block-size: var(--identifier-control-height);
  padding: 7px 13px;
  background: var(--identifier-surface-soft);
  font-weight: 700;
  cursor: pointer;
}

.identifier-button:hover:not(:disabled) {
  border-color: var(--identifier-accent);
  color: var(--identifier-accent);
}

.identifier-button--primary {
  border-color: var(--identifier-accent);
  color: #ffffff;
  background: var(--identifier-accent);
}

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

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

.identifier-page :is(.identifier-button, input, select, textarea):focus-visible {
  outline: 3px solid var(--identifier-focus-ring);
  outline-offset: 2px;
}

.identifier-settings-grid,
.identifier-stats,
.identifier-special-grid,
.identifier-about-grid {
  display: grid;
  grid-template-columns: var(--identifier-grid-columns);
}

.identifier-settings-grid {
  --identifier-grid-columns: var(--identifier-settings-columns-wide);
  gap: var(--identifier-gap);
}

.identifier-actions {
  flex-wrap: wrap;
  gap: var(--identifier-gap-small);
}

.identifier-actions--end {
  justify-content: flex-end;
  margin-block-start: 14px;
}

.identifier-message {
  min-block-size: 22px;
  margin-block: 10px 0;
  color: var(--identifier-muted);
  font-size: 0.9rem;
}

.identifier-message[data-type="success"] { color: var(--identifier-success); }
.identifier-message[data-type="warning"] { color: var(--identifier-warning); }
.identifier-message[data-type="error"] { color: var(--identifier-danger); }

.identifier-stats {
  --identifier-grid-columns: repeat(4, minmax(0, 1fr));
  margin: 0 0 16px;
  border-block-start: 1px solid var(--identifier-border);
  border-inline-start: 1px solid var(--identifier-border);
}

.identifier-stats--validation {
  --identifier-grid-columns: repeat(6, minmax(0, 1fr));
  margin-block-start: 18px;
}

.identifier-stat {
  min-inline-size: 0;
  padding: 10px 12px;
  border-block-end: 1px solid var(--identifier-border);
  border-inline-end: 1px solid var(--identifier-border);
}

.identifier-stat dt {
  color: var(--identifier-muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.identifier-stat dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
  font-weight: 700;
}

.identifier-output,
.identifier-validation-input {
  inline-size: 100%;
  block-size: var(--identifier-textarea-height);
  min-block-size: var(--identifier-textarea-height);
  max-block-size: var(--identifier-textarea-height);
  padding: 12px;
  resize: none;
  font: var(--identifier-code-size)/1.6 var(--identifier-code-font);
}

.identifier-output {
  --identifier-textarea-height: var(--identifier-output-height);
}

.identifier-validation-input {
  --identifier-textarea-height: var(--identifier-validation-height);
}

.identifier-list-heading {
  margin-block: 18px 10px;
}

.identifier-list-title {
  margin-block-end: 0;
  font-size: 1rem;
}

.identifier-muted {
  color: var(--identifier-muted);
  font-size: 0.88rem;
}

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

.identifier-result-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--identifier-gap-compact);
  padding: 8px 10px;
  border-radius: var(--identifier-control-radius);
}

.identifier-result-list code,
.identifier-special-grid code {
  overflow-wrap: anywhere;
  font: var(--identifier-code-size)/1.55 var(--identifier-code-font);
}

.identifier-pagination {
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--identifier-gap-small);
  margin-block-start: 14px;
}

.identifier-pagination span {
  min-inline-size: 70px;
  color: var(--identifier-muted);
  text-align: center;
  font-weight: 700;
}

.identifier-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--identifier-border);
  border-radius: var(--identifier-table-radius);
}

.identifier-validation-table {
  inline-size: 100%;
  border-collapse: collapse;
  background: var(--identifier-surface);
}

.identifier-validation-table :is(th, td) {
  padding: 9px 10px;
  border-block-end: 1px solid var(--identifier-border);
  text-align: start;
  vertical-align: top;
}

.identifier-validation-table th {
  color: var(--identifier-muted);
  background: var(--identifier-surface-soft);
  font-size: 0.82rem;
  white-space: nowrap;
}

.identifier-validation-table td {
  font-size: 0.86rem;
}

.identifier-validation-table tbody tr:last-child td {
  border-block-end: 0;
}

.identifier-table-code {
  min-inline-size: 250px;
  font: var(--identifier-table-code-size)/1.55 var(--identifier-code-font);
  overflow-wrap: anywhere;
}

.identifier-status {
  display: inline-flex;
  min-block-size: 27px;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  font-weight: 800;
  white-space: nowrap;
}

.identifier-status--valid {
  color: var(--identifier-success);
  background: var(--identifier-success-bg);
}

.identifier-status--invalid {
  color: var(--identifier-danger);
  background: var(--identifier-danger-bg);
}

.identifier-status--duplicate {
  color: var(--identifier-warning);
  background: var(--identifier-warning-bg);
}

.identifier-special-grid {
  --identifier-grid-columns: var(--identifier-special-columns);
}

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

.identifier-special-grid,
.identifier-about-grid {
  gap: var(--identifier-gap-large);
}

.identifier-special-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--identifier-gap-compact);
  padding: 14px;
  border-radius: var(--identifier-card-radius);
}

.identifier-result-list li,
.identifier-special-card {
  border: 1px solid var(--identifier-border);
  background: var(--identifier-surface-soft);
}

.identifier-special-card-title {
  grid-column: 1 / -1;
  margin-block-end: 0;
  font-size: 1rem;
}

.identifier-about > p,
.identifier-about li {
  line-height: 1.7;
}

.identifier-about-grid {
  margin-block-start: 18px;
}

.identifier-page [hidden] {
  display: none !important;
}

@media (max-width: 1080px) {
  .identifier-settings-grid {
    --identifier-grid-columns: var(--identifier-settings-columns-tablet);
  }

  .identifier-stats--validation {
    --identifier-grid-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .identifier-main {
    inline-size: min(100% - var(--identifier-page-gutter-mobile), var(--identifier-content-width));
    padding-block: 24px;
  }

  .identifier-panel {
    --identifier-panel-padding: 14px;
  }

  .identifier-settings-grid,
  .identifier-stats,
  .identifier-stats--validation,
  .identifier-special-grid,
  .identifier-about-grid {
    --identifier-grid-columns: 1fr;
  }

  .identifier-panel-heading--actions {
    align-items: stretch;
    flex-direction: column;
  }

  .identifier-result-list li,
  .identifier-special-card {
    grid-template-columns: 1fr;
  }

  .identifier-result-list .identifier-button,
  .identifier-special-card .identifier-button {
    justify-self: start;
  }
}