:root {
  color-scheme: light dark;
  --color-bg: #fdfdfc;
  --color-fg: #1c1c1c;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-card: #ffffff;
  --color-card-hover: #f7f7f6;
  --color-accent: #d97706;
  --color-accent-hover: #b45309;
  --color-code-bg: #f4f4f3;
  --color-code-fg: #1c1c1c;
  --color-link: #1d4ed8;
  --color-link-hover: #1e3a8a;
  --color-quote-border: #d97706;
  --color-table-stripe: #fafaf9;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #18181b;
    --color-fg: #e4e4e7;
    --color-muted: #9ca3af;
    --color-border: #2c2c30;
    --color-card: #1f1f23;
    --color-card-hover: #27272a;
    --color-accent: #fbbf24;
    --color-accent-hover: #f59e0b;
    --color-code-bg: #0f0f11;
    --color-code-fg: #e4e4e7;
    --color-link: #93c5fd;
    --color-link-hover: #bfdbfe;
    --color-quote-border: #fbbf24;
    --color-table-stripe: #1c1c1f;
  }
}

[data-theme="light"] {
  --color-bg: #fdfdfc;
  --color-fg: #1c1c1c;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-card: #ffffff;
  --color-card-hover: #f7f7f6;
  --color-accent: #d97706;
  --color-accent-hover: #b45309;
  --color-code-bg: #f4f4f3;
  --color-code-fg: #1c1c1c;
  --color-link: #1d4ed8;
  --color-link-hover: #1e3a8a;
  --color-quote-border: #d97706;
  --color-table-stripe: #fafaf9;
}

[data-theme="dark"] {
  --color-bg: #18181b;
  --color-fg: #e4e4e7;
  --color-muted: #9ca3af;
  --color-border: #2c2c30;
  --color-card: #1f1f23;
  --color-card-hover: #27272a;
  --color-accent: #fbbf24;
  --color-accent-hover: #f59e0b;
  --color-code-bg: #0f0f11;
  --color-code-fg: #e4e4e7;
  --color-link: #93c5fd;
  --color-link-hover: #bfdbfe;
  --color-quote-border: #fbbf24;
  --color-table-stripe: #1c1c1f;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

aside.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 1.5rem 1.25rem;
  border-right: 1px solid var(--color-border);
  background: var(--color-card);
}

aside.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-fg);
  margin-bottom: 1.5rem;
}

aside.sidebar .brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  font-family: var(--font-mono);
}

aside.sidebar nav h3 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin: 1.25rem 0 0.5rem;
  font-weight: 600;
}

aside.sidebar nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

aside.sidebar nav ul li {
  margin: 0;
}

aside.sidebar nav ul li a {
  display: block;
  padding: 0.4rem 0.65rem;
  font-size: 0.9rem;
  color: var(--color-fg);
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.15s;
}

aside.sidebar nav ul li a:hover {
  background: var(--color-card-hover);
}

aside.sidebar nav ul li a.active {
  background: var(--color-card-hover);
  color: var(--color-accent);
  font-weight: 600;
}

main.content {
  padding: 2rem 3rem 5rem;
  max-width: 980px;
  width: 100%;
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-link);
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  color: var(--color-fg);
  font-size: 0.85rem;
  font-family: inherit;
}

.theme-toggle:hover {
  background: var(--color-card-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin: 2.2rem 0 0.8rem;
  scroll-margin-top: 1rem;
}

h1 {
  font-size: 2rem;
  margin-top: 0;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: 1.2rem;
}

h4 {
  font-size: 1.05rem;
}

p {
  margin: 0.8rem 0;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

code {
  background: var(--color-code-bg);
  color: var(--color-code-fg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  position: relative;
  margin: 1rem 0;
}

pre code {
  background: transparent;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.55;
}

pre .copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  cursor: pointer;
  color: var(--color-muted);
  opacity: 0;
  transition: opacity 0.15s;
  font-family: inherit;
}

pre:hover .copy-btn {
  opacity: 1;
}

pre .copy-btn:hover {
  color: var(--color-fg);
}

pre .copy-btn.copied {
  color: var(--color-accent);
  opacity: 1;
}

blockquote {
  border-left: 4px solid var(--color-quote-border);
  margin: 1rem 0;
  padding: 0.6rem 1rem;
  color: var(--color-muted);
  background: var(--color-card-hover);
  border-radius: 0 6px 6px 0;
}

blockquote p {
  margin: 0.3rem 0;
}

ul, ol {
  padding-left: 1.5rem;
  margin: 0.8rem 0;
}

li {
  margin: 0.25rem 0;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2rem 0;
  font-size: 0.92rem;
  display: block;
  overflow-x: auto;
}

table thead {
  background: var(--color-card-hover);
}

table th, table td {
  border: 1px solid var(--color-border);
  padding: 0.55rem 0.9rem;
  text-align: left;
  vertical-align: top;
}

table tbody tr:nth-child(even) {
  background: var(--color-table-stripe);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

.mermaid {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem;
  margin: 1.2rem 0;
  text-align: center;
  overflow-x: auto;
}

/* Hub (index) layout */
.hub-hero {
  margin: 0 0 2rem;
}

.hub-hero h1 {
  font-size: 2.4rem;
  margin: 0 0 0.5rem;
}

.hub-hero p {
  color: var(--color-muted);
  font-size: 1.05rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  display: block;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.2rem 1.3rem;
  text-decoration: none;
  color: inherit;
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
  box-shadow: var(--shadow-card);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
  text-decoration: none;
  color: inherit;
}

.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: var(--color-fg);
}

.card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.card .card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-code-bg);
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.section-heading {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  font-weight: 600;
  margin: 2rem 0 0.8rem;
  padding: 0;
  border: none;
}

footer.page-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* =========================================================
   Reusable components for content pages
   ========================================================= */

/* Page hero: 各ページ冒頭の見出し + リード */
.page-hero {
  margin: 0 0 2rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  margin: 0 0 0.6rem;
  font-size: 2.2rem;
  letter-spacing: -0.015em;
}

.page-hero .lead {
  font-size: 1.05rem;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
  max-width: 64ch;
}

.page-hero .eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

/* Callout: 注意書き / 補足情報 */
.callout {
  --callout-color: var(--color-accent);
  border-left: 4px solid var(--callout-color);
  background: color-mix(in oklab, var(--callout-color) 6%, var(--color-card));
  border-radius: 0 8px 8px 0;
  padding: 0.85rem 1.1rem;
  margin: 1.2rem 0;
  font-size: 0.93rem;
  line-height: 1.65;
}

.callout > *:first-child { margin-top: 0; }
.callout > *:last-child  { margin-bottom: 0; }

.callout--info     { --callout-color: #0ea5e9; }
.callout--warning  { --callout-color: #f59e0b; }
.callout--danger   { --callout-color: #dc2626; }
.callout--success  { --callout-color: #16a34a; }
.callout--note     { --callout-color: var(--color-muted); }

.callout__title {
  font-weight: 700;
  margin-bottom: 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--callout-color);
}

.callout__title::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--callout-color);
}

/* Badge: ステータス / カテゴリのラベル */
.badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 999px;
  background: var(--color-code-bg);
  color: var(--color-fg);
  border: 1px solid var(--color-border);
  letter-spacing: 0.04em;
  white-space: nowrap;
  vertical-align: middle;
}

.badge--accent  { background: var(--color-accent); color: #fff; border-color: transparent; }
.badge--info    { background: #0ea5e9; color: #fff; border-color: transparent; }
.badge--warn    { background: #f59e0b; color: #fff; border-color: transparent; }
.badge--danger  { background: #dc2626; color: #fff; border-color: transparent; }
.badge--success { background: #16a34a; color: #fff; border-color: transparent; }
.badge--muted   { background: var(--color-card-hover); color: var(--color-muted); }

/* Stat: KPI 風の数値表示 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.stat {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow-card);
}

.stat__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  font-weight: 600;
}

.stat__value {
  font-size: 1.7rem;
  font-weight: 800;
  margin-top: 0.3rem;
  color: var(--color-fg);
  line-height: 1.15;
}

.stat__hint {
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-top: 0.3rem;
}

/* Phase / Step リスト: 番号付き手順 */
.phase-list {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0;
  display: grid;
  gap: 0.7rem;
  counter-reset: phase-counter;
}

.phase-list > li {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.9rem 1.1rem 0.9rem 3.4rem;
  position: relative;
  box-shadow: var(--shadow-card);
  counter-increment: phase-counter;
}

.phase-list > li::before {
  content: counter(phase-counter);
  position: absolute;
  left: 0.85rem;
  top: 0.85rem;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.92rem;
}

.phase-list strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.98rem;
}

.phase-list small {
  color: var(--color-muted);
  font-size: 0.82rem;
}

/* Definition list 風の説明リスト */
.def-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.5rem 1.4rem;
  margin: 1rem 0;
  align-items: baseline;
}

.def-list dt {
  font-weight: 700;
  color: var(--color-fg);
  font-size: 0.92rem;
}

.def-list dd {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.92rem;
}

/* Q&A: 質問・回答のカードペア */
.qa-list {
  display: grid;
  gap: 1.1rem;
  margin: 1.5rem 0;
}

.qa {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow-card);
}

.qa__question {
  font-weight: 700;
  font-size: 1rem;
  margin: 0 0 0.6rem;
  padding-left: 1.8rem;
  position: relative;
  line-height: 1.5;
}

.qa__question::before {
  content: "Q";
  position: absolute;
  left: 0;
  top: 0.05em;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.qa__answer {
  padding-left: 1.8rem;
  position: relative;
  color: var(--color-fg);
  font-size: 0.93rem;
  line-height: 1.65;
}

.qa__answer::before {
  content: "A";
  position: absolute;
  left: 0;
  top: 0.05em;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: var(--color-card-hover);
  border: 1px solid var(--color-border);
  color: var(--color-fg);
  font-size: 0.78rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.qa__answer > p:first-child { margin-top: 0; }
.qa__answer > p:last-child  { margin-bottom: 0; }

/* Prism.js テーマの上書き — サイト共通の <pre> スタイルに揃える */
pre[class*="language-"] {
  background: var(--color-code-bg) !important;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  margin: 1rem 0;
  font-size: 0.85rem;
  line-height: 1.55;
  text-shadow: none !important;
}

pre[class*="language-"] code {
  background: transparent;
  padding: 0;
  text-shadow: none !important;
  font-size: inherit;
}

/* Prism の標準トークン色がライト/ダーク両方で読みやすくなるよう微調整 */
code[class*="language-"],
pre[class*="language-"] {
  font-family: var(--font-mono);
  text-shadow: none !important;
}

/* インライン code はハイライトせずシンプルに */
:not(pre) > code[class*="language-"] {
  background: var(--color-code-bg);
  color: var(--color-code-fg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
}

/* H2 (Q) / H3 (A) Q&A 表示 — technical-qa 等で使用 */
h2.qa-q {
  padding-left: 3.2rem;
  position: relative;
  border-bottom-color: color-mix(in oklab, var(--color-accent) 40%, var(--color-border));
  margin-top: 2.6rem;
}

h2.qa-q::before {
  content: "Q";
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 800;
  font-size: 1.05rem;
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  justify-content: center;
}

h3.qa-a {
  padding-left: 3.2rem;
  position: relative;
  color: var(--color-fg);
}

h3.qa-a::before {
  content: "A";
  position: absolute;
  left: 0.35rem;
  top: 0.05em;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 50%;
  background: var(--color-card-hover);
  border: 1px solid var(--color-border);
  color: var(--color-fg);
  font-weight: 800;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* テーブル enhancements */
table tbody tr:hover {
  background: var(--color-card-hover);
}

table.cols-compact th,
table.cols-compact td {
  padding: 0.4rem 0.7rem;
  font-size: 0.86rem;
}

/* KBD: キーボードキー / 短いコマンド名強調 */
kbd {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  background: var(--color-card-hover);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 0.82em;
  color: var(--color-fg);
}

/* リスト内のコードを少し詰める */
li > code {
  font-size: 0.86em;
}

/* Mobile */
@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  aside.sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.25rem;
  }

  main.content {
    padding: 1.5rem 1.25rem 3rem;
  }

  h1 {
    font-size: 1.7rem;
  }

  .page-hero h1 {
    font-size: 1.7rem;
  }

  .def-list {
    grid-template-columns: 1fr;
    gap: 0.2rem 0;
  }

  .def-list dt {
    margin-top: 0.5rem;
  }
}