:root {
  color-scheme: light;

  /* ページとライトテーマの配色 */
  --zalgo-page-background: #f4f6f8;
  --zalgo-surface: #ffffff;
  --zalgo-subtle: #f6f8fa;
  --zalgo-border: #d0d7de;
  --zalgo-text: #1f2328;
  --zalgo-muted: #57606a;
  --zalgo-accent: #0969da;
  --zalgo-notice-text: #0550ae;
  --zalgo-notice-border: #b6e3ff;
  --zalgo-notice-background: #ddf4ff;

  /* ワークスペースのダークテーマ配色 */
  --zalgo-dark-surface: #161b22;
  --zalgo-dark-subtle: #21262d;
  --zalgo-dark-border: #3d444d;
  --zalgo-dark-text: #f0f6fc;
  --zalgo-dark-muted: #9da7b3;
  --zalgo-dark-input: #0d1117;

  /* レイアウトとコンポーネント寸法 */
  --zalgo-radius: 10px;
  --zalgo-control-radius: 7px;
  --zalgo-control-height: 38px;
  --zalgo-content-width: 1200px;
  --zalgo-page-gutter: 32px;
  --zalgo-page-padding: 32px;
  --zalgo-panel-padding: 16px;
  --zalgo-gap: 12px;
  --zalgo-space-2: 8px;
  --zalgo-space-3: 10px;
  --zalgo-space-4: 12px;
  --zalgo-space-5: 14px;
  --zalgo-space-6: 16px;

  /* プレビューとUIの書体 */
  --zalgo-preview-font-size: 20px;
  --zalgo-preview-font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  --zalgo-ui-font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  --zalgo-code-font-family: "Cascadia Code", Consolas, monospace;
  --zalgo-shadow: 0 1px 2px rgba(31, 35, 40, 0.06);
}

/* 宣言順: レイアウト、寸法、余白、外観、文字、操作状態 */
/* 基本要素とページ構造 */
* {
  box-sizing: border-box;
}

/* ダウンロード時などに動的生成する一時要素にも適用する */
[hidden] {
  display: none !important;
}

body.zalgo-page {
  min-block-size: 100vh;
  margin: 0;
  color: var(--zalgo-text);
  background: var(--zalgo-page-background);
  font-family: var(--zalgo-ui-font-family);
}

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

.zalgo-page-header {
  margin-block-end: var(--zalgo-space-6);
}

.zalgo-page-header h1 {
  margin-block: var(--zalgo-space-2) 0;
  margin-inline: 0;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
}

.zalgo-page-header p {
  margin-block: var(--zalgo-space-2) 0;
  margin-inline: 0;
  color: var(--zalgo-muted);
  line-height: 1.7;
}

.zalgo-page .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--zalgo-space-2);
  font-size: 0.9rem;
}

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

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

/* ページ共通の面と注意書き */
:is(.zalgo-notice, .zalgo-workspace, .zalgo-about) {
  border: 1px solid var(--zalgo-border);
  border-radius: var(--zalgo-radius);
  background: var(--zalgo-surface);
  box-shadow: var(--zalgo-shadow);
}

.zalgo-notice {
  margin-block-end: var(--zalgo-space-6);
  padding-block: var(--zalgo-space-4);
  padding-inline: var(--zalgo-space-5);
  color: var(--zalgo-notice-text);
  border-color: var(--zalgo-notice-border);
  background: var(--zalgo-notice-background);
  line-height: 1.65;
}

/* ワークスペースのテーマと表示設定 */
.zalgo-workspace {
  --workspace-surface: var(--zalgo-surface);
  --workspace-subtle: var(--zalgo-subtle);
  --workspace-border: var(--zalgo-border);
  --workspace-text: var(--zalgo-text);
  --workspace-muted: var(--zalgo-muted);
  --workspace-input: var(--zalgo-surface);
  overflow: hidden;
  color: var(--workspace-text);
  background: var(--workspace-surface);
}

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

.zalgo-workspace[data-font-family="serif"] {
  --zalgo-preview-font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
}

.zalgo-workspace[data-font-family="monospace"] {
  --zalgo-preview-font-family: var(--zalgo-code-font-family);
}

.zalgo-workspace[data-font-size="16"] {
  --zalgo-preview-font-size: 16px;
}

.zalgo-workspace[data-font-size="20"] {
  --zalgo-preview-font-size: 20px;
}

.zalgo-workspace[data-font-size="24"] {
  --zalgo-preview-font-size: 24px;
}

.zalgo-workspace[data-font-size="32"] {
  --zalgo-preview-font-size: 32px;
}

/* ツールバーとパネルの共通レイアウト */
:is(
  .zalgo-toolbar,
  .zalgo-toolbar-group,
  .zalgo-panel-heading,
  .zalgo-heading-actions,
  .zalgo-actions,
  .zalgo-range-row,
  .zalgo-seed-row
) {
  display: flex;
  align-items: center;
  gap: var(--zalgo-space-3);
  flex-wrap: wrap;
}

.zalgo-toolbar {
  justify-content: space-between;
  padding-block: var(--zalgo-space-4);
  padding-inline: var(--zalgo-space-5);
  border-block-end: 1px solid var(--workspace-border);
  background: var(--workspace-subtle);
}

.zalgo-panel {
  padding: var(--zalgo-panel-padding);
  border-block-end: 1px solid var(--workspace-border);
}

.zalgo-panel-heading {
  justify-content: space-between;
  align-items: flex-start;
  margin-block-end: var(--zalgo-space-4);
}

h2.zalgo-panel-title,
h2.zalgo-about-title {
  margin: 0;
  font-size: 1rem;
}

p.zalgo-panel-description {
  margin-block: 5px 0;
  margin-inline: 0;
  color: var(--workspace-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* 入力コントロールとボタン */
.zalgo-counter {
  color: var(--workspace-muted);
  font-size: 0.82rem;
  white-space: nowrap;
}

.zalgo-field {
  display: grid;
  gap: 6px;
  color: var(--workspace-muted);
  font-size: 0.84rem;
}

.zalgo-field--row {
  grid-template-columns: auto minmax(120px, auto);
  align-items: center;
}

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

.zalgo-control {
  padding-inline: 10px;
}

.zalgo-button {
  padding-inline: 13px;
  background: var(--workspace-subtle);
  font-weight: 700;
  cursor: pointer;
}

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

.zalgo-button:is(:hover, :focus-visible):not(:disabled) {
  color: var(--zalgo-accent);
  border-color: var(--zalgo-accent);
  background: var(--workspace-input);
}

.zalgo-button:disabled {
  opacity: 0.48;
  cursor: not-allowed;
}

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

.zalgo-textarea {
  display: block;
  inline-size: 100%;
  min-block-size: 180px;
  padding: var(--zalgo-space-4);
  resize: vertical;
  font-family: var(--zalgo-code-font-family);
  font-size: 15px;
  line-height: 1.8;
}

.zalgo-output {
  min-block-size: 220px;
  line-height: 2.5;
}

/* 生成設定 */
.zalgo-settings-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--zalgo-gap);
}

.zalgo-setting-group {
  display: grid;
  align-content: start;
  gap: var(--zalgo-space-3);
  min-inline-size: 0;
  margin: 0;
  padding: var(--zalgo-space-5);
  border: 1px solid var(--workspace-border);
  border-radius: var(--zalgo-control-radius);
  background: var(--workspace-subtle);
}

.zalgo-setting-group--seed {
  grid-column: span 2;
}

legend.zalgo-setting-legend {
  padding-inline: 5px;
  color: var(--workspace-text);
  font-weight: 700;
}

p.zalgo-setting-note {
  margin: 0;
  color: var(--workspace-muted);
  font-size: 0.8rem;
  line-height: 1.55;
}

.zalgo-check-field {
  display: flex;
  align-items: center;
  gap: var(--zalgo-space-2);
  min-block-size: 30px;
  font-size: 0.86rem;
}

.zalgo-check-field input {
  inline-size: 17px;
  block-size: 17px;
  margin: 0;
  accent-color: var(--zalgo-accent);
}

.zalgo-range-row {
  flex-wrap: nowrap;
}

.zalgo-range-row input {
  flex: 1;
  min-inline-size: 100px;
  accent-color: var(--zalgo-accent);
}

.zalgo-range-row output {
  min-inline-size: 3.6em;
  color: var(--workspace-text);
  font-family: var(--zalgo-code-font-family);
  text-align: end;
}

.zalgo-seed-row {
  flex-wrap: nowrap;
}

.zalgo-seed-row input {
  flex: 1;
  min-inline-size: 0;
  font-family: var(--zalgo-code-font-family);
}

.zalgo-actions {
  justify-content: flex-end;
  margin-block-start: var(--zalgo-space-5);
}

/* 表示プレビュー */
.zalgo-preview-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--zalgo-space-4);
  margin-block: var(--zalgo-space-6) var(--zalgo-space-2);
}

h3.zalgo-preview-title {
  margin: 0;
  font-size: 0.92rem;
}

span.zalgo-preview-note {
  color: var(--workspace-muted);
  font-size: 0.78rem;
}

.zalgo-preview {
  min-block-size: 130px;
  max-block-size: 360px;
  overflow: auto;
  padding-block: 24px;
  padding-inline: var(--zalgo-space-6);
  color: var(--workspace-text);
  border: 1px solid var(--workspace-border);
  border-radius: var(--zalgo-control-radius);
  background: var(--workspace-input);
  font-family: var(--zalgo-preview-font-family);
  font-size: var(--zalgo-preview-font-size);
  line-height: 3;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

/* 統計と状態メッセージ */
h2.zalgo-stats-title {
  margin-block-end: var(--zalgo-space-4);
}

.zalgo-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--zalgo-space-3);
  margin: 0;
}

div.zalgo-stat-item {
  min-inline-size: 0;
  padding: var(--zalgo-space-4);
  border: 1px solid var(--workspace-border);
  border-radius: var(--zalgo-control-radius);
  background: var(--workspace-subtle);
}

dt.zalgo-stat-label {
  color: var(--workspace-muted);
  font-size: 0.78rem;
}

dd.zalgo-stat-value {
  margin-block: 5px 0;
  margin-inline: 0;
  overflow: hidden;
  font-family: var(--zalgo-code-font-family);
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.zalgo-message {
  min-block-size: 44px;
  margin: 0;
  padding-block: var(--zalgo-space-4);
  padding-inline: var(--zalgo-space-6);
  color: var(--workspace-muted);
  background: var(--workspace-subtle);
  line-height: 1.5;
}

.zalgo-message[data-status="success"] {
  color: #1a7f37;
}

.zalgo-message[data-status="error"] {
  color: #cf222e;
}

/* ツール説明 */
.zalgo-about {
  margin-block-start: var(--zalgo-space-6);
  padding: 22px;
  line-height: 1.7;
}

p.zalgo-about-description {
  color: var(--zalgo-muted);
}

.zalgo-about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

h3.zalgo-about-subtitle {
  margin-block: 18px 6px;
  margin-inline: 0;
  font-size: 0.95rem;
}

:is(ul, ol).zalgo-about-list {
  margin-block: 6px 0;
  padding-inline-start: 22px;
}

/* レスポンシブレイアウト */
@media (max-width: 900px) {
  .zalgo-settings-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  :root {
    --zalgo-page-gutter: 20px;
    --zalgo-page-padding: 20px;
  }

  .zalgo-toolbar,
  .zalgo-panel-heading,
  .zalgo-preview-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .zalgo-toolbar-group,
  .zalgo-heading-actions {
    inline-size: 100%;
  }

  .zalgo-field--row {
    display: grid;
    flex: 1 1 160px;
    grid-template-columns: 1fr;
  }

  .zalgo-settings-grid,
  .zalgo-stats,
  .zalgo-about-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .zalgo-setting-group--seed {
    grid-column: auto;
  }

  .zalgo-heading-actions .zalgo-button,
  .zalgo-actions .zalgo-button {
    flex: 1 1 140px;
  }

  .zalgo-textarea {
    min-block-size: 220px;
  }
}