:root {
  color-scheme: light;
  --counter-page-background: #f4f6f8;
  --counter-surface: #ffffff;
  --counter-surface-subtle: #f6f8fa;
  --counter-border: #d0d7de;
  --counter-text: #1f2328;
  --counter-muted: #57606a;
  --counter-accent: #0969da;
  --counter-success: #1a7f37;
  --counter-warning: #9a6700;
  --counter-danger: #cf222e;
  --counter-notice-text: #0550ae;
  --counter-notice-border: #b6e3ff;
  --counter-notice-background: #ddf4ff;
  --counter-dark-surface: #161b22;
  --counter-dark-surface-subtle: #21262d;
  --counter-dark-border: #3d444d;
  --counter-dark-text: #f0f6fc;
  --counter-dark-muted: #9da7b3;
  --counter-dark-input: #0d1117;
  --counter-radius: 10px;
  --counter-control-radius: 7px;
  --counter-pill-radius: 999px;
  --counter-control-height: 38px;
  --counter-content-width: 1200px;
  --counter-page-inline-gutter: 32px;
  --counter-page-block-padding: 32px;
  --counter-mobile-page-inline-gutter: 20px;
  --counter-mobile-page-block-padding: 20px;
  --counter-panel-padding: 16px;
  --counter-card-padding: 14px;
  --counter-primary-gap: 10px;
  --counter-secondary-gap: 8px;
  --counter-detail-gap: 12px;
  --counter-editor-font-size: 14px;
  --counter-editor-line-height: 1.7;
  --counter-checkbox-size: 17px;
  --counter-compact-control-width: 130px;
  --counter-editor-min-height: 360px;
  --counter-editor-mobile-min-height: 300px;
  --counter-progress-height: 12px;
  --counter-frequency-code-min-width: 2.2em;
  --counter-frequency-code-radius: 4px;
  --counter-preview-max-height: 320px;
  --counter-message-min-height: 44px;
  --counter-mobile-button-basis: 140px;
  --counter-drop-zone-border: #8c959f;
  --counter-code-font-family: "Cascadia Code", "Consolas", monospace;
  --counter-shadow: 0 1px 2px rgba(31, 35, 40, 0.06);
}

/* Page foundation */
* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

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

.character-counter-page-header {
  margin-block-end: 16px;
}

.character-counter-page-header h1 {
  margin-block: 8px 0;
  margin-inline: 0;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
}

.character-counter-page-header p {
  margin-block: 8px 0;
  margin-inline: 0;
  color: var(--counter-muted);
  line-height: 1.7;
}

.character-counter-page .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

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

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

/* Notices and workspace themes */
:is(.character-counter-notice, .character-counter-workspace) {
  border: 1px solid var(--counter-border);
  border-radius: var(--counter-radius);
  background: var(--counter-surface);
  box-shadow: var(--counter-shadow);
}

.character-counter-notice {
  margin-block-end: 16px;
  padding-block: 12px;
  padding-inline: 14px;
  color: var(--counter-notice-text);
  border-color: var(--counter-notice-border);
  background: var(--counter-notice-background);
  line-height: 1.65;
}

.character-counter-notice span {
  display: block;
}

.character-counter-workspace {
  --workspace-surface: var(--counter-surface);
  --workspace-subtle: var(--counter-surface-subtle);
  --workspace-border: var(--counter-border);
  --workspace-text: var(--counter-text);
  --workspace-muted: var(--counter-muted);
  --workspace-input: var(--counter-surface);
  overflow: hidden;
  color: var(--workspace-text);
  background: var(--workspace-surface);
}

.character-counter-workspace[data-theme="dark"] {
  color-scheme: dark;
  --workspace-surface: var(--counter-dark-surface);
  --workspace-subtle: var(--counter-dark-surface-subtle);
  --workspace-border: var(--counter-dark-border);
  --workspace-text: var(--counter-dark-text);
  --workspace-muted: var(--counter-dark-muted);
  --workspace-input: var(--counter-dark-input);
}

.character-counter-workspace[data-font-size="12"] {
  --counter-editor-font-size: 12px;
}

.character-counter-workspace[data-font-size="14"] {
  --counter-editor-font-size: 14px;
}

.character-counter-workspace[data-font-size="16"] {
  --counter-editor-font-size: 16px;
}

.character-counter-workspace[data-font-size="18"] {
  --counter-editor-font-size: 18px;
}

/* Toolbar and controls */
:is(
  .character-counter-toolbar,
  .character-counter-panel-heading,
  .character-counter-toolbar-group,
  .character-counter-file-controls,
  .character-counter-target-inputs
) {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.character-counter-toolbar {
  justify-content: space-between;
  padding-block: 12px;
  padding-inline: 14px;
  border-block-end: 1px solid var(--workspace-border);
  background: var(--workspace-subtle);
}

.character-counter-workspace button,
.character-counter-control {
  min-block-size: var(--counter-control-height);
  color: var(--workspace-text);
  border: 1px solid var(--workspace-border);
  border-radius: var(--counter-control-radius);
  background: var(--workspace-input);
  font: inherit;
}

.character-counter-workspace button {
  padding-inline: 12px;
  background: var(--workspace-subtle);
  font-weight: 700;
  cursor: pointer;
}

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

.character-counter-workspace button:disabled {
  opacity: 0.48;
  cursor: not-allowed;
}

.character-counter-workspace :is(button, select, input, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--counter-accent);
  outline-offset: 2px;
}

.character-counter-field {
  display: grid;
  gap: 5px;
  color: var(--workspace-muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.character-counter-field--compact {
  display: flex;
  align-items: center;
  gap: 8px;
}

.character-counter-field .character-counter-control {
  min-inline-size: var(--counter-compact-control-width);
  padding-inline: 10px;
}

.character-counter-check-field {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--workspace-muted);
  font-size: 0.9rem;
  cursor: pointer;
}

.character-counter-check-field input {
  inline-size: var(--counter-checkbox-size);
  block-size: var(--counter-checkbox-size);
  margin: 0;
  accent-color: var(--counter-accent);
}

/* Content panels */
.character-counter-panel {
  padding: var(--counter-panel-padding);
  border-block-end: 1px solid var(--workspace-border);
}

.character-counter-panel-heading {
  justify-content: space-between;
  align-items: flex-start;
  margin-block-end: 12px;
}

:is(
  .character-counter-panel-heading,
  .character-counter-detail-panel,
  .character-counter-whitespace-panel
) h2 {
  margin: 0;
  font-size: 1rem;
}

:is(.character-counter-panel-heading p, .character-counter-whitespace-panel > p) {
  margin-block: 5px 0;
  margin-inline: 0;
  color: var(--workspace-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.character-counter-file-controls {
  justify-content: flex-end;
}

.character-counter-drop-zone {
  margin-block-end: 10px;
  padding-block: 11px;
  padding-inline: 14px;
  color: var(--workspace-muted);
  border: 1px dashed var(--counter-drop-zone-border);
  border-radius: var(--counter-control-radius);
  background: var(--workspace-subtle);
  text-align: center;
  cursor: pointer;
}

.character-counter-drop-zone:is(:hover, [data-dragging="true"]) {
  color: var(--counter-accent);
  border-color: var(--counter-accent);
  background: color-mix(in srgb, var(--counter-accent) 8%, var(--workspace-subtle));
}

.character-counter-file-name {
  margin-block: 0 10px;
  margin-inline: 0;
  color: var(--counter-accent);
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.character-counter-input {
  display: block;
  inline-size: 100%;
  min-block-size: var(--counter-editor-min-height);
  resize: vertical;
  padding: var(--counter-card-padding);
  color: var(--workspace-text);
  border: 1px solid var(--workspace-border);
  border-radius: var(--counter-control-radius);
  background: var(--workspace-input);
  font: var(--counter-editor-font-size)/var(--counter-editor-line-height)
    var(--counter-code-font-family);
  tab-size: 4;
}

.character-counter-target-inputs .character-counter-control {
  inline-size: var(--counter-compact-control-width);
}

.character-counter-progress {
  display: block;
  inline-size: 100%;
  block-size: var(--counter-progress-height);
  overflow: hidden;
  border: 0;
  border-radius: var(--counter-pill-radius);
  background: var(--workspace-subtle);
  accent-color: var(--counter-accent);
}

.character-counter-progress::-webkit-progress-bar {
  background: var(--workspace-subtle);
}

.character-counter-progress::-webkit-progress-value {
  border-radius: var(--counter-pill-radius);
  background: var(--counter-accent);
}

.character-counter-progress::-moz-progress-bar {
  border-radius: var(--counter-pill-radius);
  background: var(--counter-accent);
}

.character-counter-target-status {
  margin-block: 9px 0;
  margin-inline: 0;
  color: var(--workspace-muted);
  font-size: 0.9rem;
}

.character-counter-target-status[data-status="within"] {
  color: var(--counter-success);
}

.character-counter-target-status[data-status="short"] {
  color: var(--counter-warning);
}

.character-counter-target-status:is([data-status="over"], [data-status="invalid"]) {
  color: var(--counter-danger);
  font-weight: 700;
}

:is(
  .character-counter-primary-stats,
  .character-counter-secondary-stats,
  .character-counter-detail-list
) {
  margin: 0;
}

/* Statistics and details */
.character-counter-primary-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--counter-primary-gap);
}

.character-counter-primary-stats > div,
.character-counter-secondary-stats > div,
.character-counter-detail-panel {
  min-inline-size: 0;
  border: 1px solid var(--workspace-border);
  border-radius: var(--counter-control-radius);
  background: var(--workspace-subtle);
}

.character-counter-primary-stats > div {
  padding: var(--counter-card-padding);
}

.character-counter-primary-stats dt {
  color: var(--workspace-muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.character-counter-primary-stats dd {
  margin-block: 4px;
  margin-inline: 0;
  color: var(--counter-accent);
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  font-weight: 800;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.character-counter-primary-stats span {
  color: var(--workspace-muted);
  font-size: 0.76rem;
}

.character-counter-secondary-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--counter-secondary-gap);
  margin-block-start: 10px;
}

.character-counter-secondary-stats > div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding-block: 10px;
  padding-inline: 12px;
}

:is(.character-counter-secondary-stats, .character-counter-detail-list) dt {
  color: var(--workspace-muted);
  font-size: 0.82rem;
}

:is(.character-counter-secondary-stats, .character-counter-detail-list) dd {
  margin: 0;
  font-weight: 800;
  text-align: end;
  overflow-wrap: anywhere;
}

.character-counter-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--counter-detail-gap);
  padding: var(--counter-panel-padding);
  border-block-end: 1px solid var(--workspace-border);
}

.character-counter-detail-panel {
  padding: var(--counter-card-padding);
}

.character-counter-detail-panel h2 {
  margin-block-end: 10px;
}

.character-counter-detail-list {
  display: grid;
  gap: 0;
}

.character-counter-detail-list > div {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding-block: 7px;
  border-block-end: 1px solid var(--workspace-border);
}

.character-counter-detail-list > div:last-child {
  border-block-end: 0;
}

.character-counter-frequency-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-inline-start: 24px;
}

.character-counter-frequency-list li {
  padding-inline-start: 3px;
}

.character-counter-frequency-list li::marker {
  color: var(--workspace-muted);
}

.character-counter-frequency-list code {
  display: inline-block;
  min-inline-size: var(--counter-frequency-code-min-width);
  margin-inline-end: 8px;
  padding-block: 2px;
  padding-inline: 5px;
  border: 1px solid var(--workspace-border);
  border-radius: var(--counter-frequency-code-radius);
  background: var(--workspace-input);
  text-align: center;
}

.character-counter-empty {
  margin: 0;
  color: var(--workspace-muted);
  font-size: 0.88rem;
}

.character-counter-whitespace-panel pre {
  max-block-size: var(--counter-preview-max-height);
  margin-block: 12px 0;
  margin-inline: 0;
  overflow: auto;
  padding: var(--counter-detail-gap);
  color: var(--workspace-text);
  border: 1px solid var(--workspace-border);
  border-radius: var(--counter-control-radius);
  background: var(--workspace-input);
  font: var(--counter-editor-font-size)/var(--counter-editor-line-height)
    var(--counter-code-font-family);
  white-space: pre;
}

.character-counter-message {
  min-block-size: var(--counter-message-min-height);
  margin: 0;
  padding-block: 12px;
  padding-inline: 16px;
  color: var(--workspace-muted);
  background: var(--workspace-subtle);
  line-height: 1.5;
}

/* Feedback states */
.character-counter-message[data-type="success"] {
  color: var(--counter-success);
}

.character-counter-message[data-type="error"] {
  color: var(--counter-danger);
  font-weight: 700;
}

/* Responsive layout */
@media (max-width: 900px) {
  :is(.character-counter-primary-stats, .character-counter-secondary-stats) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .character-counter-detail-grid {
    grid-template-columns: 1fr 1fr;
  }

  .character-counter-detail-panel:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .character-counter-main {
    inline-size: min(
      calc(100% - var(--counter-mobile-page-inline-gutter)),
      var(--counter-content-width)
    );
    padding-block: var(--counter-mobile-page-block-padding);
  }

  :is(
    .character-counter-toolbar,
    .character-counter-panel-heading,
    .character-counter-file-controls,
    .character-counter-target-inputs
  ) {
    align-items: stretch;
    flex-direction: column;
  }

  .character-counter-toolbar-group {
    inline-size: 100%;
  }

  .character-counter-toolbar-group > button {
    flex: 1 1 var(--counter-mobile-button-basis);
  }

  .character-counter-field--compact {
    justify-content: space-between;
  }

  :is(
    .character-counter-file-controls,
    .character-counter-target-inputs
  ) .character-counter-field {
    inline-size: 100%;
  }

  :is(
    .character-counter-file-controls,
    .character-counter-target-inputs
  ) .character-counter-control {
    inline-size: 100%;
  }

  .character-counter-input {
    min-block-size: var(--counter-editor-mobile-min-height);
  }

  :is(
    .character-counter-primary-stats,
    .character-counter-secondary-stats,
    .character-counter-detail-grid
  ) {
    grid-template-columns: 1fr;
  }

  .character-counter-detail-panel:last-child {
    grid-column: auto;
  }
}