html, body {
  line-height: 2;
}

:root{
  --base-color: hsl(120 48% 38%);
  --bg-color: hsl(120 20% 96%);
}

body.theme-tsuki {
  background: var(--bg-color, #D6DAE1);
  margin: 0;
  color: #222;
}

body.theme-dark {
  background: var(--bg-color, #0a0a0a);
  margin: 0;
  color: #ffffff;
}

body.theme-dark .container-section {
  background: #1a1a1a;
  border-color: #333;
  color: #ffffff;
}

body.theme-dark .sidebar {
  background: #111111 !important;
  border-right-color: #333 !important;
}

body.theme-dark .home-link {
  color: #90ff90 !important;
}

body.theme-dark a {
  color: #90ff90;
}

body.theme-dark a:visited {
  color: #c9a9ff;
}

.layout {
  position: relative;
  min-height: 100vh;
}

.sidebar {
  display: none;
}

.main-content {
  margin: 2em auto;
  max-width: 700px;
  min-width: 0;
  box-sizing: border-box;
  position: relative;
}

/* 個別のセクションコンテナ */
.container-section {
  background: #fff;
  border: 2px solid #444;
  margin-bottom: 1.5em;
  padding: 2em;
  box-sizing: border-box;
  position: relative;
}

/* 最初のセクションの上マージンを調整 */
.container-section:first-child {
  margin-top: 0;
}

/* 最後のセクションの下マージンを調整 */
.container-section:last-child {
  margin-bottom: 0;
}

.home-top, .home-bottom {
  text-align: left;
  margin: 1em 0;
  display: none;
}

.theme-toggle {
  background: none;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 0.3em 0.5em;
  cursor: pointer;
  font-size: 0.9em;
  margin-bottom: 1em;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: rgba(0, 0, 0, 0.1);
}

body.theme-dark .theme-toggle {
  border-color: #333;
  color: #ffffff;
}

body.theme-dark .theme-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

.mobile-only {
  display: none;
}

.home-link {
  display: block;
  font-weight: bold;
  margin-bottom: 1.5em;
  text-decoration: none;
  color: var(--base-color, #090);
}

.toc {
  font-size: 0.95em;
  line-height: 1.6;
}

/* サイドバーありの画面用 */
@media (min-width: 800px) {
  .sidebar {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: 20vw;
    min-width: 200px;
    max-width: 280px;
    height: 100vh;
    overflow-y: auto;
    background: #f8f8f8;
    border-right: 2px solid #ccc;
    padding: 2em 1em;
    box-sizing: border-box;
    z-index: 10;
  }
  
  .main-content {
    position: relative;
    margin: 2em auto;
    margin-left: calc(20vw + 2em);
    margin-left: clamp(calc(200px + 2em + 2em), calc(20vw + 2em), calc(280px + 2em + 2em));
    margin-right: auto;
    width: calc(100vw - clamp(calc(200px + 2em + 2em), calc(20vw + 2em), calc(280px + 2em + 2em)) - 2em);
    max-width: 800px;
    padding: 0;
  }
}

/* 大画面では本文を中央寄せ */
@media (min-width: 1400px) {
  .main-content {
    margin-left: max(calc(20vw + 2em), calc(50vw - 400px));
    margin-left: max(clamp(calc(200px + 2em + 2em), calc(20vw + 2em), calc(280px + 2em + 2em)), calc(50vw - 400px));
    width: auto;
    max-width: 800px;
  }
}

/* タブレット・スマホ画面用 */
@media (max-width: 799px) {
  .sidebar {
    display: none;
  }
  .main-content {
    position: static;
    margin: 1em;
    padding: 0;
    max-width: none;
    width: auto;
  }
  
  .container-section {
    padding: 1em;
  }
  
  .home-top, .home-bottom {
    display: block;
    margin: 1em 0;
    padding: 0 1em;
  }
  
  .home-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .mobile-only {
    display: inline-block;
  }
}

/* --- code block / inline code styling --- */
code, pre code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Courier New", monospace;
  font-size: 0.95em;
  tab-size: 4;
  hyphens: none;
  line-height: 1.5;
}

/* inline code (single backtick) */
p code, li code, span.code-inline {
  background: rgba(0,0,0,0.04);
  padding: 0.08em 0.25em;
  border-radius: 4px;
  border: 1px solid rgba(0,0,0,0.04);
  color: inherit;
}

/* fenced code blocks wrapper */
.code-block {
  margin: 1em 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(0,0,0,0.04);
  border: 1px solid rgba(0,0,0,0.06);
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(250,250,250,0.98));
}

/* header: title + copy button */
.code-block .code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6em;
  padding: 0.45em 0.6em;
  background: linear-gradient(180deg, rgba(0,0,0,0.02), rgba(0,0,0,0.01));
  border-bottom: 1px solid rgba(0,0,0,0.04);
  font-size: 0.85em;
  color: rgba(0, 0, 0, 0.6);
}
.code-block .code-title { font-weight: 600; }
.code-block .code-meta { font-size: 0.8em; color: rgba(0,0,0,0.45); }

/* copy button */
.code-block .code-copy {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.2em 0.5em;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85em;
  color: #fff;
}
.code-block .code-copy:active { transform: translateY(1px); }

/* body: gutter + content */
.code-body {
  display: flex;
  gap: 1rem;
  width: 100%;
  min-width: 0;
  overflow: auto;
}
.code-gutter {
  user-select: none;
  padding: 0.6em 0.7em;
  background: rgba(0,0,0,0.02);
  color: rgba(0,0,0,0.45);
  text-align: right;
  font-family: inherit;
  font-size: 0.9em;
  line-height: 1.5;
  border-right: 1px solid rgba(0,0,0,0.04);
  white-space: pre;
}
.code-content {
  padding: 0.6em;
  min-width: 0;
  overflow: auto;
  font-size: 0.92em;
  line-height: 1.5;
  white-space: pre;
}

/* hide gutter when selecting inside block or when wrapper has .hide-gutter */
.code-block.selection-active .code-gutter,
.code-block.hide-gutter .code-gutter {
  display: none;
}

/* responsive: allow horizontal scroll inside content, keep header visible */
.code-body::-webkit-scrollbar { height: 10px; }
.code-body::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.08); border-radius: 6px; }

/* table responsive improvements */
table { display: block; width: 100%; overflow: auto; border-radius: 6px; }
@media (prefers-color-scheme: dark) {
  .code-block { background: linear-gradient(180deg, rgba(18,18,18,0.98), rgba(22,22,22,0.98)); border-color: rgba(255,255,255,0.04); }
  .code-block .code-header { background: rgba(255,255,255,0.02); color: rgba(255,255,255,0.7); }
  .code-gutter { background: rgba(255,255,255,0.02); color: rgba(255,255,255,0.5); border-right-color: rgba(255,255,255,0.03); }
  pre, code { color: #eaeaea; }
  pre { background: transparent; }
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.6em 0;
}
table th, table td {
  border: 1px solid rgba(0,0,0,0.08);
  padding: 0.5em 0.6em;
  text-align: left;
  background: rgba(255,255,255,0.02);
}
table th { font-weight: bold; }
pre, code {
  font-family: Consolas, 'Courier New', monospace;
  background: rgba(0,0,0,0.03);
  color: inherit;
}
pre {
  padding: 0.8em;
  overflow: auto;
  border-radius: 6px;
  margin: 0.8em 0;
  border: 1px solid rgba(0,0,0,0.06);
}
code {
  padding: 0.12em 0.25em;
  border-radius: 3px;
  background: rgba(0,0,0,0.02);
  font-size: 0.95em;
}

/* --- モード切替関連（厳密 / 具体） --- */
/* Mode toggle area: keep existing layout but add accent-tinted background using --base-color */
.mode-toggle-group {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  position: relative;
  padding: 0.15rem;
  border-radius: 8px;
  transition: background-color .18s ease, border-color .18s ease;
  /* subtle left-to-right tint using accent color; fallback to semi-transparent gray if color-mix unsupported */
  background: linear-gradient(90deg, color-mix(in srgb, var(--base-color) 10%, white), transparent);
  border: 1px solid rgba(0,0,0,0.04);
}
.mode-toggle {
  background: transparent;
  border: 1px solid rgba(0,0,0,0.12);
  padding: 0.25em 0.5em;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9em;
  transition: background-color .12s ease, border-color .12s ease, color .12s ease;
}
.mode-toggle.active {
  /* stronger accent for active state */
  background: color-mix(in srgb, var(--base-color) 22%, white);
  border-color: color-mix(in srgb, var(--base-color) 36%, rgba(0,0,0,0.12));
}
body.theme-dark .mode-toggle-group {
  /* dark theme: tint towards black for subtlety */
  background: linear-gradient(90deg, color-mix(in srgb, var(--base-color) 8%, black), transparent);
  border: 1px solid rgba(255,255,255,0.04);
}
body.theme-dark .mode-toggle { border-color: rgba(255,255,255,0.12); color: #fff; }
body.theme-dark .mode-toggle.active {
  background: color-mix(in srgb, var(--base-color) 18%, black);
  border-color: color-mix(in srgb, var(--base-color) 30%, rgba(255,255,255,0.12));
}

/* タグ単位での表示制御（data-mode 属性を使う）
   - 要素に data-mode="precise" を付けると厳密モードでのみ表示
   - data-mode="concrete" は具体モードでのみ表示
   - 指定がない要素は両方のモードで表示される（デフォルト） */
body:not(.mode-precise) [data-mode="precise"] { display: none !important; }
body.mode-precise [data-mode="concrete"] { display: none !important; }

/* 簡易: data-mode 属性が付いたが値がない場合は両方で表示（何もしない） */

body.theme-tsuki .code-block {
  background: linear-gradient(180deg, #ffffff, #fbfbfb);
  border-color: rgba(0,0,0,0.06);
  color: #111;
}
body.theme-tsuki .code-block .code-header {
  background: linear-gradient(180deg, rgba(0,0,0,0.02), rgba(0,0,0,0.01));
  color: rgba(0,0,0,0.65);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
body.theme-tsuki .code-block .code-copy {
  color: #111;
  background: none;
  border: 1px solid rgba(0,0,0,0.06);
}
body.theme-tsuki .code-gutter {
  background: rgba(0,0,0,0.02);
  color: rgba(0,0,0,0.45);
  border-right: 1px solid rgba(0,0,0,0.04);
}
body.theme-tsuki .code-content,
body.theme-tsuki pre,
body.theme-tsuki code {
  color: #111;
  background: transparent;
}
.code-block pre,
.code-block code,
.code-block .code-content pre,
.code-block .code-content code {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  padding: 0 !important;
  margin: 0 !important;
  border-radius: 0 !important;
}

/* --- mode-controlled content background --- */
[data-mode] {
  display: block;
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  transition: background-color .18s ease, border-color .18s ease, box-shadow .18s ease;
}

/* show accent-tinted background for the visible mode's elements */
body.mode-precise [data-mode="precise"],
body:not(.mode-precise) [data-mode="concrete"] {
  /* use accent --base-color lightly; fall back to subtle gray */
  background: color-mix(in srgb, var(--base-color) 10%, transparent);
  box-shadow: 0 4px 10px color-mix(in srgb, var(--base-color) 6%, rgba(0,0,0,0.04));
}

/* dark theme adjustments */
body.theme-dark.mode-precise [data-mode="precise"],
body.theme-dark:not(.mode-precise) [data-mode="concrete"] {
  background: color-mix(in srgb, var(--base-color) 12%, black);
  box-shadow: 0 4px 10px color-mix(in srgb, var(--base-color) 6%, rgba(0,0,0,0.4));
}

/* ensure hidden mode elements keep no background when hidden */
body:not(.mode-precise) [data-mode="precise"] { background: none !important; box-shadow: none !important; }
body.mode-precise [data-mode="concrete"] { background: none !important; box-shadow: none !important; }

/* Expand mode-controlled elements to span the container-section's inner width
   so the accent background reaches the content edges rather than hugging text. */
.container-section [data-mode] {
  margin-left: -2em;
  margin-right: -2em;
  padding-left: calc(2em + 0.65rem);
  padding-right: calc(2em + 0.65rem);
  border-radius: 6px;
}

@media (max-width: 799px) {
  .container-section [data-mode] {
    margin-left: -1em;
    margin-right: -1em;
    padding-left: calc(1em + 0.65rem);
    padding-right: calc(1em + 0.65rem);
  }
}
.code-content,
.code-content pre,
.code-content code,
.code-gutter,
pre, code {
  white-space: pre;        /* 折り返しを無効化 */
  overflow-x: auto;       /* 横スクロールで表示する */
  word-break: normal;
  word-wrap: normal;
}


/* details（解答欄）表示をライト／ダークで確実に見えるように修正 */
details {
  background: #f6f8fa; /* ライト時の薄い背景 */
  color: #111;         /* ライト時は濃い文字色 */
  padding: 10px;
  border-radius: 6px;
}
details summary {
  cursor: pointer;
  font-weight: 700;
  color: inherit; /* 親の色を継承 */
}

/* ダークモード時は薄い背景＋明るい文字色にする（黒は不可視になるため避ける） */
body.theme-dark details {
  background: rgba(255,255,255,0.1) !important; /* !important を追加してHTMLのstyle指定を上書き */
  color: #eaeaea !important; /* 念のためこちらにも追加 */
}
body.theme-dark details summary {
  color: inherit;
}

/* details 内の要素は親の色を継承する */
details * { color: inherit; }

/* ===== Highlight.js の背景を透明にし、自作の背景色を活かす ===== */
.hljs {
  background: transparent !important;
  padding: 0 !important;
}

/* Highlight.jsトークンカラーをテーマに応じて調整 */
body.theme-tsuki .hljs,
body.theme-tsuki .hljs-attr,
body.theme-tsuki .hljs-quote {
  color: #111;
}

body.theme-dark .hljs,
body.theme-dark .hljs-attr,
body.theme-dark .hljs-quote {
  color: #eaeaea;
}

/* キーワード、数値、文字列などのハイライト色を確保 */
.hljs-string { color: #028a0f; }
.hljs-number { color: #0066ff; }
.hljs-literal { color: #0066ff; }
.hljs-attr { color: #df3600; }
.hljs-symbol { color: #d73a49; }
.hljs-bullet { color: #005cc5; }
.hljs-title { color: #6f42c1; }
.hljs-section { color: #6f42c1; }
.hljs-keyword { color: #d73a49; }
.hljs-type { color: #d73a49; }

body.theme-dark .hljs-string { color: #85e89d; }
body.theme-dark .hljs-number { color: #79b8ff; }
body.theme-dark .hljs-literal { color: #79b8ff; }
body.theme-dark .hljs-attr { color: #f97583; }
body.theme-dark .hljs-symbol { color: #f97583; }
body.theme-dark .hljs-bullet { color: #79b8ff; }
body.theme-dark .hljs-title { color: #b392f0; }
body.theme-dark .hljs-section { color: #b392f0; }
body.theme-dark .hljs-keyword { color: #f97583; }
body.theme-dark .hljs-type { color: #f97583; }

/* ===== 実験用: 複数ターミナルのコードブロック並列表示 ===== */
.experiment-terminals {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin: 15px 0;
}

.experiment-terminals .code-block {
  margin: 0;
}

.experiment-terminals .terminal-label {
  font-weight: 700;
  font-size: 1.2em;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-left: 4px solid #007bff;
  padding-left: 10px;
  color: #007bff;
}

body.theme-dark .experiment-terminals .terminal-label {
  border-bottom: 2px solid rgba(79, 166, 255, 0.3);
  color: #4fa6ff;
}

.experiment-terminals .empty-terminal {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 60px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.02);
  border-radius: 6px;
  color: rgba(0, 0, 0, 0.5);
  font-style: italic;
}

body.theme-dark .experiment-terminals .empty-terminal {
  background: rgba(255, 255, 255, 0.02);
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 799px) {
  .experiment-terminals {
    grid-template-columns: 1fr;
  }
}