:root {
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --text: #2b2f36;
  --text-strong: #111418;
  --text-muted: #6b7280;
  --border: #e3e5ea;
  --border-strong: #d4d7de;
  --accent: #6246ea;
  --accent-hover: #4b30d1;
  --accent-soft: #efebff;
  --marker: #fdeb9e;
  --code-bg: #f2f3f6;
  --sidebar-bg: #fafafb;
  --active-bg: #f0edff;
  --th-bg: #f6f5fb;
  --row-alt: #fbfbfd;
  --scrollbar: #cfd3da;
  --ok: #1a7f4b;
  --ok-bg: #e8f6ee;
  --ng: #c2362f;
  --ng-bg: #fdecea;
  --warn: #a8650a;
  --warn-bg: #fff4e0;
  --radius: 10px;
}

[data-theme="dark"] {
  --bg: #0f1115;
  --bg-elevated: #16181d;
  --text: #d5d8de;
  --text-strong: #f4f5f7;
  --text-muted: #969dab;
  --border: #292d35;
  --border-strong: #353a44;
  --accent: #a893ff;
  --accent-hover: #c6b9ff;
  --accent-soft: #231e38;
  --marker: #5b4a12;
  --code-bg: #1d2027;
  --sidebar-bg: #121419;
  --active-bg: #221d36;
  --th-bg: #1c1b26;
  --row-alt: #191b21;
  --scrollbar: #3a3f4a;
  --ok: #5fd08f;
  --ok-bg: #16281f;
  --ng: #ff8a80;
  --ng-bg: #2e1a1a;
  --warn: #f0b55a;
  --warn-bg: #2d2414;
}

* { box-sizing: border-box; }

/* display を指定したクラス（ボタン等）でも hidden 属性で確実に隠れるようにする */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  /* iPhone では 100vh がアドレスバー分だけ大きくなるため、実際の表示高さ(dvh)を優先する */
  height: 100dvh;
}

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1.25rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 20;
}

.brand {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text-strong);
  white-space: nowrap;
}
.brand:hover { color: var(--accent); }

.search-box { flex: 1; max-width: 420px; }
.search-box input {
  width: 100%;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}
.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.theme-toggle, .nav-toggle, .icon-link {
  background: none;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  color: var(--text-muted);
  transition: background-color 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover, .nav-toggle:hover, .icon-link:hover { background: var(--active-bg); color: var(--accent); }

.icon-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  text-decoration: none;
  margin-left: auto;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
}

/* Layout */
.body-layout {
  display: flex;
  flex: 1;
  min-height: 0;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 1rem 0.75rem 2rem;
}

.nav-overlay {
  display: none;
}

.content-area {
  flex: 1;
  min-width: 0;
  padding: 2.75rem clamp(1.25rem, 5vw, 4rem) 3rem;
  overflow-y: auto;
  background: var(--bg-elevated);
  scroll-padding-top: 1rem;
}

.toc {
  width: 240px;
  flex-shrink: 0;
  padding: 2.75rem 1.25rem 2rem;
  overflow-y: auto;
  font-size: 0.82rem;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
}
/* 目次のない画面（ホーム・四択問題など）では右の列を消して本文を広く使う */
.toc:empty { display: none; }
.toc-title {
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-strong);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}
.toc a {
  display: block;
  padding: 0.3rem 0 0.3rem 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
  line-height: 1.5;
  border-left: 2px solid var(--border);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.toc a:hover { color: var(--text-strong); }
.toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}
.toc a.level-3 { padding-left: 1.6rem; font-size: 0.78rem; }

/* Nav tree */
.nav-tree ul {
  list-style: none;
  margin: 0;
  padding-left: 0.6rem;
}
.nav-tree > ul { padding-left: 0; }
.nav-tree > ul > li > .nav-group > ul {
  padding-left: 0;
}

.nav-group summary {
  cursor: pointer;
  font-weight: 700;
  padding: 0.35rem 0.6rem;
  margin-top: 0.4rem;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.nav-group summary:hover { background: var(--active-bg); color: var(--text-strong); }
.nav-group .nav-group > ul {
  margin-left: 0.7rem;
  padding-left: 0.4rem;
  border-left: 1px solid var(--border);
}

.nav-tree a {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.45rem 0.7rem;
  margin: 0.1rem 0;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  transition: background-color 0.15s ease, color 0.15s ease;
}
.nav-tree a:hover { background: var(--active-bg); }
.nav-tree a.active {
  background: var(--active-bg);
  color: var(--accent);
}
.nav-tree a.active::before {
  content: "";
  position: absolute;
  left: -0.4rem;
  top: 0.45rem;
  bottom: 0.45rem;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
}
.nav-link-title {
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-link-summary {
  font-size: 0.72rem;
  font-weight: 400;
  line-height: 1.45;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.nav-tree a.active .nav-link-summary { color: var(--accent); opacity: 0.85; }
.nav-tree .empty {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0.5rem;
  line-height: 1.6;
}
.nav-tree .hidden { display: none !important; }
.nav-snippet {
  margin: -0.1rem 0 0.35rem 0.7rem;
  padding: 0 0.7rem;
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}
.nav-snippet mark {
  background: var(--marker);
  color: var(--text-strong);
  border-radius: 3px;
  padding: 0 0.15em;
}

/* Markdown body */
.markdown-body {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: 0.01em;
  overflow-wrap: break-word;
}
.markdown-body > :first-child { margin-top: 0; }
.markdown-body p { margin: 0 0 1.1em; }

.doc-breadcrumb {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
}
.markdown-body .doc-lead {
  margin: 0.6rem 0 2.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 1.02rem;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  scroll-margin-top: 1.25rem;
  line-height: 1.4;
  color: var(--text-strong);
  letter-spacing: 0;
}
.markdown-body h1 {
  font-size: 1.85rem;
  font-weight: 800;
  margin: 0;
}
.markdown-body h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 3.25rem 0 1.1rem;
  padding: 0.1rem 0 0.1rem 0.85rem;
  border-left: 4px solid var(--accent);
}
.markdown-body h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 2.25rem 0 0.75rem;
}
.markdown-body h4 {
  font-size: 1rem;
  margin: 1.75rem 0 0.5rem;
}

/* 重要語（スライドの赤字）は蛍光ペン風に目立たせる。表や見出しの中では色だけにとどめる */
.markdown-body strong {
  font-weight: 700;
  color: var(--text-strong);
}
.markdown-body p strong,
.markdown-body li strong {
  background: linear-gradient(transparent 62%, var(--marker) 62%);
  padding: 0 0.05em;
}

.markdown-body ul, .markdown-body ol {
  padding-left: 1.4em;
  margin: 0 0 1.25em;
}
.markdown-body li { margin: 0.35em 0; }
.markdown-body li > ul, .markdown-body li > ol { margin: 0.3em 0 0.4em; }
.markdown-body ul ul { list-style-type: circle; }
.markdown-body li::marker { color: var(--text-muted); }

.markdown-body pre {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1rem 1.2rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.6;
  margin: 0 0 1.5em;
}
.markdown-body code {
  font-family: ui-monospace, "SFMono-Regular", Consolas, "Noto Sans JP", monospace;
  background: var(--code-bg);
  padding: 0.12em 0.4em;
  border-radius: 5px;
  font-size: 0.88em;
}
.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}
.code-copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0.8;
  transition: opacity 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}
.code-copy-btn:hover { opacity: 1; background: var(--active-bg); color: var(--accent); }
.code-copy-btn .icon-check { display: none; }
.code-copy-btn.copied { opacity: 1; color: var(--accent); border-color: var(--accent); }
.code-copy-btn.copied .icon-copy { display: none; }
.code-copy-btn.copied .icon-check { display: block; }

.markdown-body blockquote {
  margin: 1.25rem 0;
  padding: 0.6rem 1.1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
}
.markdown-body blockquote > :last-child { margin-bottom: 0; }

.table-wrap {
  margin: 0.5rem 0 1.75rem;
  overflow-x: auto;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
}
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  line-height: 1.65;
}
.markdown-body th, .markdown-body td {
  padding: 0.65rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
.markdown-body th + th, .markdown-body td + td { border-left: 1px solid var(--border); }
.markdown-body th {
  background: var(--th-bg);
  color: var(--text-strong);
  font-weight: 700;
  font-size: 0.84rem;
  white-space: nowrap;
}
.markdown-body tbody tr:nth-child(even) td { background: var(--row-alt); }
.markdown-body tbody tr:last-child td { border-bottom: none; }
.markdown-body td:first-child {
  min-width: 8em;
  font-weight: 600;
  color: var(--text-strong);
}

.markdown-body img {
  max-width: 100%;
  border-radius: var(--radius);
}
.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.75rem 0;
}
.markdown-body .loading,
.markdown-body .error,
.markdown-body .empty-state {
  color: var(--text-muted);
}

.doc-pager {
  max-width: 820px;
  margin: 3.5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
}
.doc-pager[hidden] { display: none; }
.pager-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 48%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.pager-link:hover { border-color: var(--accent); background: var(--active-bg); }
.pager-prev { text-align: left; }
.pager-next { text-align: right; margin-left: auto; }
.pager-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}
.pager-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent);
}

.site-footer {
  max-width: 820px;
  margin: 2rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.78rem;
  text-align: center;
}
.doc-pager:not([hidden]) + .site-footer { border-top: none; padding-top: 0; margin-top: 1.5rem; }

/* Quiz */
.nav-quiz-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.45rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text-strong);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}
.nav-quiz-link svg { color: var(--accent); flex-shrink: 0; }
.nav-quiz-link:hover, .nav-quiz-link.active {
  border-color: var(--accent);
  background: var(--active-bg);
  color: var(--accent);
}

.quiz-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 3rem 0 0;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--accent-soft);
}
.quiz-cta-text { display: flex; flex-direction: column; gap: 0.15rem; }
.quiz-cta-text strong { color: var(--text-strong); background: none; padding: 0; }
.quiz-cta-text span { color: var(--text-muted); font-size: 0.88rem; line-height: 1.6; }
.markdown-body .quiz-cta-button,
.quiz-primary, .quiz-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
[data-theme="dark"] .markdown-body .quiz-cta-button,
[data-theme="dark"] .quiz-primary { color: #16181d; }
.markdown-body .quiz-cta-button:hover, .quiz-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
[data-theme="dark"] .markdown-body .quiz-cta-button:hover,
[data-theme="dark"] .quiz-primary:hover { color: #16181d; }
.quiz-secondary { background: transparent; color: var(--accent); }
.quiz-secondary:hover { background: var(--active-bg); }
.quiz-link-button {
  background: none;
  border: none;
  padding: 0.4rem 0.2rem;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.86rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.quiz-link-button:hover { color: var(--text-strong); }
.quiz-small {
  padding: 0.25rem 0.8rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
.quiz-small:hover { background: var(--accent); color: var(--bg-elevated); }

.quiz-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0 0 2rem;
}
.quiz-stat {
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--sidebar-bg);
}
.quiz-stat-value { font-size: 1.6rem; font-weight: 800; color: var(--text-strong); line-height: 1.2; }
.quiz-stat-label { font-size: 0.78rem; color: var(--text-muted); }

.quiz-setup {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem 1.5rem;
  padding: 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.quiz-field { display: flex; flex-direction: column; gap: 0.35rem; }
.quiz-field:first-child { flex: 1 1 280px; }
.quiz-field-label { font-size: 0.8rem; font-weight: 700; color: var(--text-strong); }
.quiz-select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
}
.quiz-select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.quiz-segment {
  display: inline-flex;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  overflow: hidden;
}
.quiz-segment label { cursor: pointer; }
.quiz-segment input { position: absolute; opacity: 0; pointer-events: none; }
.quiz-segment span {
  display: block;
  padding: 0.5rem 0.95rem;
  font-size: 0.88rem;
  color: var(--text);
  border-left: 1px solid var(--border-strong);
}
.quiz-segment label:first-child span { border-left: none; }
.quiz-segment input:checked + span { background: var(--accent); color: var(--bg-elevated); font-weight: 700; }
.quiz-segment input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: -2px; }

.markdown-body .quiz-progress-table td:first-child { font-weight: 500; }
.markdown-body .quiz-progress-table td { vertical-align: middle; }
.markdown-body .quiz-progress-table th:not(:first-child),
.markdown-body .quiz-progress-table td:not(:first-child) {
  width: 1%;
  white-space: nowrap;
  text-align: center;
}
.markdown-body .quiz-progress-table .quiz-group-row td { text-align: left; white-space: normal; }
.markdown-body .quiz-group-row td {
  background: var(--th-bg) !important;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  padding-top: 0.45rem;
  padding-bottom: 0.45rem;
}
.quiz-cell-done { color: var(--ok); font-weight: 700; }
.quiz-cell-weak { color: var(--ng); font-weight: 700; }

.quiz-top {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}
.quiz-count { font-weight: 800; color: var(--text-strong); font-size: 1rem; }
.quiz-scope { color: var(--text-muted); font-size: 0.85rem; }
.quiz-running-score { margin-left: auto; color: var(--ok); font-weight: 700; font-size: 0.88rem; }
.quiz-bar { height: 6px; background: var(--border); border-radius: 999px; overflow: hidden; margin-bottom: 1.5rem; }
.quiz-bar-fill { height: 100%; background: var(--accent); border-radius: 999px; transition: width 0.3s ease; }

.quiz-card, .quiz-review {
  padding: 1.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  background: var(--bg-elevated);
}
.quiz-review { margin-bottom: 1rem; padding: 1.1rem 1.25rem; }
.quiz-source { font-size: 0.78rem; font-weight: 600; color: var(--text-muted); margin-bottom: 0.5rem; }
.markdown-body .quiz-question {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.7;
  margin: 0 0 1.25rem;
}
.quiz-review .quiz-question { font-size: 1rem; margin-bottom: 0.6rem; }
.markdown-body .quiz-choices { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.6rem; }
.markdown-body .quiz-choices li { margin: 0; }
.quiz-choice {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1.5px solid var(--border-strong);
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--text);
  font: inherit;
  font-size: 0.97rem;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.quiz-choice:hover:not(:disabled) { border-color: var(--accent); background: var(--active-bg); }
.quiz-choice:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.quiz-choice:disabled { cursor: default; }
.quiz-choice-key {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  margin-top: 0.02rem;
  border-radius: 6px;
  background: var(--code-bg);
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 700;
}
.quiz-choice.is-correct { border-color: var(--ok); background: var(--ok-bg); color: var(--text-strong); }
.quiz-choice.is-correct .quiz-choice-key { background: var(--ok); color: #fff; }
.quiz-choice.is-wrong { border-color: var(--ng); background: var(--ng-bg); color: var(--text-strong); }
.quiz-choice.is-wrong .quiz-choice-key { background: var(--ng); color: #fff; }
.quiz-choice:disabled:not(.is-correct):not(.is-wrong) { opacity: 0.55; }

/* 選択肢を消す（取り消し線） */
.markdown-body .quiz-choices .quiz-choice-row { display: flex; align-items: stretch; gap: 0.4rem; }
.quiz-choice-row .quiz-choice { flex: 1; min-width: 0; }
.quiz-strike {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.quiz-strike:hover:not(:disabled) { border-color: var(--ng); color: var(--ng); background: var(--ng-bg); }
.quiz-strike:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.quiz-strike:disabled { opacity: 0.35; cursor: default; }
.quiz-choice-row.is-struck .quiz-strike { border-color: var(--ng); background: var(--ng); color: #fff; }
.quiz-choice-row.is-struck .quiz-choice { cursor: not-allowed; border-style: dashed; background: var(--sidebar-bg); }
.quiz-choice-row.is-struck .quiz-choice:hover:not(:disabled) { border-color: var(--border-strong); background: var(--sidebar-bg); }
.quiz-choice-row.is-struck .quiz-choice-text {
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--ng);
  color: var(--text-muted);
  opacity: 0.7;
}
.quiz-choice-row.is-struck .quiz-choice-key { opacity: 0.5; }

.quiz-feedback {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border-radius: 10px;
  border-left: 4px solid var(--border-strong);
  background: var(--sidebar-bg);
}
.quiz-feedback.is-correct { border-left-color: var(--ok); background: var(--ok-bg); }
.quiz-feedback.is-wrong { border-left-color: var(--ng); background: var(--ng-bg); }
.quiz-verdict { font-weight: 800; font-size: 1.05rem; margin-bottom: 0.25rem; }
.quiz-feedback.is-correct .quiz-verdict { color: var(--ok); }
.quiz-feedback.is-wrong .quiz-verdict { color: var(--ng); }
.markdown-body .quiz-answer-line, .markdown-body .quiz-review-answer { font-weight: 700; color: var(--text-strong); margin: 0 0 0.35rem; }
.markdown-body .quiz-review-yours { color: var(--ng); margin: 0 0 0.2rem; font-size: 0.92rem; }
.markdown-body .quiz-explain { margin: 0 0 0.5rem; font-size: 0.93rem; }
.quiz-doc-link { font-size: 0.86rem; font-weight: 600; }

/* 自信なし */
.quiz-unsure {
  display: inline-flex;
  align-items: center;
  margin-top: 0.85rem;
  padding: 0.4rem 0.85rem;
  border: 1.5px dashed var(--border-strong);
  border-radius: 999px;
  background: none;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
}
.quiz-unsure:hover { border-color: var(--warn); color: var(--warn); }
.quiz-unsure:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.quiz-unsure.is-on { border-style: solid; border-color: var(--warn); background: var(--warn-bg); color: var(--warn); }
.quiz-feedback.is-unsure { border-left-color: var(--warn); background: var(--warn-bg); }
.quiz-feedback.is-unsure .quiz-verdict { color: var(--warn); }

/* ほかの選択肢の説明 */
.quiz-others {
  margin: 0.2rem 0 0.5rem;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 0.86rem;
}
.quiz-others-title { font-size: 0.74rem; font-weight: 700; color: var(--text-muted); margin-bottom: 0.2rem; }
.markdown-body .quiz-others-list { list-style: none; margin: 0; padding: 0; }
.markdown-body .quiz-others-list li { margin: 0.15rem 0; line-height: 1.6; }
.quiz-others-choice { font-weight: 700; color: var(--text-strong); }
.quiz-others-list li.is-picked .quiz-others-choice { color: var(--ng); }
.quiz-others-arrow { margin: 0 0.4rem; color: var(--text-muted); }
.quiz-others-desc { color: var(--text); }

/* 前回の続き */
.quiz-resume {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding: 0.9rem 1.1rem;
  border: 1.5px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent-soft);
}
.quiz-resume-text { display: flex; flex-direction: column; gap: 0.1rem; }
.quiz-resume-title { font-weight: 800; color: var(--text-strong); }
.quiz-resume-sub { font-size: 0.85rem; color: var(--text-muted); }
.quiz-resume-actions { display: flex; align-items: center; gap: 0.75rem; }

.quiz-check {
  flex-basis: 100%;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text);
  cursor: pointer;
}
.quiz-check input { margin-top: 0.3rem; accent-color: var(--accent); }

/* 結果のカテゴリ別正答率 */
.markdown-body .quiz-breakdown-list { list-style: none; margin: 0 0 1.5rem; padding: 0; display: grid; gap: 0.5rem; }
.markdown-body .quiz-breakdown-row {
  display: grid;
  grid-template-columns: minmax(8rem, 13rem) 1fr 10.5rem 7.5rem;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
}
.quiz-breakdown-name { font-weight: 700; color: var(--text-strong); font-size: 0.9rem; }
.quiz-breakdown-bar { height: 8px; border-radius: 999px; background: var(--border); overflow: hidden; }
.quiz-breakdown-fill { display: block; height: 100%; border-radius: 999px; background: var(--accent); }
.quiz-breakdown-row.is-low .quiz-breakdown-fill { background: var(--ng); }
.quiz-breakdown-row.is-full .quiz-breakdown-fill { background: var(--ok); }
.quiz-breakdown-row > .quiz-small { justify-self: end; }
.quiz-breakdown-num { font-size: 0.84rem; color: var(--text-muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.quiz-breakdown-row.is-low .quiz-breakdown-num { color: var(--ng); font-weight: 700; }
@media (max-width: 640px) {
  .markdown-body .quiz-breakdown-row { grid-template-columns: 1fr auto; gap: 0.4rem 0.75rem; }
  .quiz-breakdown-bar { grid-column: 1 / -1; grid-row: 2; }
  .quiz-breakdown-num { grid-column: 1; grid-row: 3; white-space: normal; }
  .quiz-breakdown-row > .quiz-small, .quiz-breakdown-spacer { grid-column: 2; grid-row: 1; }
}

.quiz-review-tag {
  display: inline-block;
  margin-right: 0.5rem;
  padding: 0.05rem 0.5rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
}
.quiz-review-tag.is-wrong { background: var(--ng-bg); color: var(--ng); }
.quiz-review-tag.is-unsure { background: var(--warn-bg); color: var(--warn); }

/* 資料をその場で開くパネル */
.quiz-peek { margin-top: 0.4rem; }
.quiz-peek-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.1rem;
  border: none;
  background: none;
  color: var(--accent);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
}
.quiz-peek-toggle::after {
  content: "";
  width: 0.45em;
  height: 0.45em;
  margin-top: -0.2em;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
.quiz-peek-toggle.is-open::after { transform: rotate(-135deg); margin-top: 0.15em; }
.quiz-peek-toggle:hover { color: var(--accent-hover); }
.quiz-peek-panel {
  margin-top: 0.4rem;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--bg-elevated);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  transform-origin: top center;
  animation: quiz-peek-pop 0.28s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes quiz-peek-pop {
  from { opacity: 0; transform: translateY(-6px) scale(0.97); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .quiz-peek-panel { animation: none; }
}
.quiz-peek-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  flex-wrap: wrap;
  padding: 0.5rem 0.85rem;
  border-bottom: 1px solid var(--border);
  background: var(--sidebar-bg);
  font-size: 0.78rem;
}
.quiz-peek-title { font-weight: 700; color: var(--text-muted); }
.markdown-body .quiz-peek-open { font-weight: 600; text-decoration: none; }
.quiz-peek-body {
  max-height: 340px;
  overflow-y: auto;
  padding: 0.75rem 1rem 1rem;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text);
}
.quiz-peek-body > :first-child { margin-top: 0; }
.markdown-body .quiz-peek-body h1 { font-size: 1.15rem; margin: 0 0 0.6rem; }
.markdown-body .quiz-peek-body h2 { font-size: 1rem; margin: 1.4rem 0 0.5rem; }
.markdown-body .quiz-peek-body h3 { font-size: 0.95rem; margin: 1.1rem 0 0.4rem; }
.markdown-body .quiz-peek-body table { font-size: 0.82rem; }
.markdown-body .quiz-peek-body .table-wrap { margin: 0.4rem 0 1rem; }
.markdown-body .quiz-peek-body pre { font-size: 0.78rem; }
.markdown-body .quiz-peek-body .quiz-peek-hit {
  background: var(--marker);
  outline: 2px solid color-mix(in srgb, var(--marker) 70%, var(--accent));
  outline-offset: -2px;
  border-radius: 4px;
}
.markdown-body .quiz-peek-mark { background: var(--accent); color: #fff; border-radius: 3px; padding: 0 0.15em; }
[data-theme="dark"] .markdown-body .quiz-peek-mark { color: #16181d; }
.markdown-body .quiz-peek-note { font-size: 0.78rem; color: var(--text-muted); }

.quiz-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}
.quiz-result-actions { justify-content: flex-start; margin: 1.5rem 0 1rem; }
.markdown-body .quiz-hint { margin-top: 1.5rem; font-size: 0.78rem; color: var(--text-muted); }

.quiz-result {
  margin-top: 1.25rem;
  padding: 1.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  text-align: center;
  background: var(--sidebar-bg);
}
.quiz-result-num { font-size: 3rem; font-weight: 800; color: var(--accent); line-height: 1; }
.quiz-result-total { font-size: 1.1rem; font-weight: 700; color: var(--text-strong); }
.quiz-result-rate { margin-top: 0.4rem; font-size: 0.95rem; font-weight: 700; color: var(--text-muted); }
.markdown-body .quiz-result-message { margin: 0.75rem 0 0; }

.nav-quiz-link + .nav-tree { margin-top: 0.8rem; }

.markdown-body a.quiz-small {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

/* Home */
.home-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin: 0 0 1rem;
}
.markdown-body .home-action {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.95rem 1.1rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.markdown-body .home-action:hover { border-color: var(--accent); background: var(--active-bg); }
.markdown-body .home-action.is-primary { border-color: var(--accent); background: var(--accent-soft); }
.home-action-title { font-weight: 700; color: var(--text-strong); font-size: 0.95rem; }
.home-action-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 0.9rem;
}
.home-cat {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}
.home-cat-head { display: flex; align-items: baseline; justify-content: space-between; gap: 0.5rem; }
.markdown-body .home-cat-title { margin: 0; font-size: 1.02rem; }
.home-cat-count { font-size: 0.78rem; color: var(--text-muted); white-space: nowrap; }
.home-bar { height: 6px; background: var(--border); border-radius: 999px; overflow: hidden; }
.home-bar-fill { height: 100%; background: var(--ok); border-radius: 999px; }
.home-cat-progress-text { margin-top: 0.3rem; font-size: 0.76rem; color: var(--text-muted); }
.markdown-body .home-cat-docs { margin: 0; padding-left: 1.1em; font-size: 0.88rem; line-height: 1.6; }
.markdown-body .home-cat-docs li { margin: 0.15em 0; }
.home-cat-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: auto; }
.markdown-body .home-about { margin-top: 2rem; font-size: 0.85rem; }

/* Keywords slideshow */
.kw-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.9rem 1.25rem;
  margin-bottom: 1.25rem;
}
.kw-field-scope { flex: 1 1 260px; }
.kw-check {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding-bottom: 0.55rem;
  font-size: 0.88rem;
  cursor: pointer;
  user-select: none;
}
.kw-check input { width: 1rem; height: 1rem; accent-color: var(--accent); }

.kw-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  background: var(--bg-elevated);
  overflow: hidden;
  outline: none;
}
.kw-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  min-height: 340px;
  padding: 2.5rem 2rem 2rem;
  text-align: center;
}
.kw-card.kw-enter { animation: kw-fade 0.45s ease; }
@keyframes kw-fade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .kw-card.kw-enter { animation: none; }
}
.markdown-body .kw-source {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
}
.markdown-body .kw-source:hover { color: var(--accent); text-decoration: underline; }
.kw-term {
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-strong);
  overflow-wrap: anywhere;
}
.kw-desc {
  max-width: 36em;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  line-height: 1.8;
  color: var(--text);
}
.kw-checks { display: flex; flex-wrap: wrap; gap: 0.25rem 1.1rem; }
.kw-desc-wrap { position: relative; max-width: 36em; width: 100%; }
.kw-desc-wrap .kw-desc { margin: 0 auto; transition: opacity 0.35s ease; }
.kw-think {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}
.kw-desc-wrap.is-hidden { cursor: pointer; }
.kw-desc-wrap.is-hidden .kw-desc { opacity: 0; }
.kw-desc-wrap.is-hidden .kw-think { opacity: 1; }
.kw-stage:fullscreen .kw-think { font-size: 1.2rem; }
.kw-progress { height: 4px; background: var(--border); }
.kw-progress-fill { height: 100%; width: 0; background: var(--accent); transition: width 0.1s linear; }
.kw-stage.is-paused .kw-progress-fill { background: var(--text-muted); }
.kw-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  background: var(--sidebar-bg);
  border-top: 1px solid var(--border);
}
.kw-buttons { display: flex; gap: 0.4rem; }
.kw-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.kw-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--active-bg); }
.kw-btn-play { background: var(--accent); border-color: var(--accent); color: var(--bg-elevated); }
.kw-btn-play:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--bg-elevated); }
.kw-btn-play .kw-icon-play { display: none; }
.kw-stage.is-paused .kw-btn-play .kw-icon-play { display: inline-flex; }
.kw-stage.is-paused .kw-btn-play .kw-icon-pause { display: none; }
.kw-btn span { display: inline-flex; }
.kw-counter { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.kw-footer-right { display: flex; align-items: center; gap: 0.75rem; }
.kw-known-btn {
  padding: 0.45rem 1rem;
  border: 1.5px solid var(--ok);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--ok);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.kw-known-btn:hover { background: var(--ok-bg); }
.kw-known-btn.is-known { background: var(--ok); color: #fff; }
[data-theme="dark"] .kw-known-btn.is-known { color: #16181d; }
.kw-known-status {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin: -0.25rem 0 0.9rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.kw-known-bar { flex: 1 1 140px; max-width: 260px; }
.kw-known-status .quiz-link-button { padding: 0; font-size: 0.8rem; }
.markdown-body .kw-note { margin-top: 1rem; font-size: 0.78rem; line-height: 1.7; color: var(--text-muted); }

/* 全画面ではカードを画面いっぱいに広げ、文字も大きくする */
.kw-stage:fullscreen {
  border: none;
  border-radius: 0;
  width: 100vw;
  height: 100vh;
}
.kw-stage:fullscreen .kw-card { flex: 1; padding: 3rem 6vw; gap: 2rem; }
.kw-stage:fullscreen .kw-term { font-size: clamp(2.4rem, 6vw, 5rem); }
.kw-stage:fullscreen .kw-desc { font-size: clamp(1.2rem, 2.4vw, 2rem); max-width: 40em; }
.kw-stage:fullscreen .kw-source { font-size: 1rem; }

/* Scrollbars */
.sidebar::-webkit-scrollbar, .content-area::-webkit-scrollbar, .toc::-webkit-scrollbar {
  width: 8px;
}
.sidebar::-webkit-scrollbar-thumb, .content-area::-webkit-scrollbar-thumb, .toc::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 4px;
}

@media (max-width: 1100px) {
  .toc { display: none; }
}

@media (max-width: 700px) {
  .topbar {
    flex-wrap: wrap;
    row-gap: 0.6rem;
    padding: 0.6rem 0.9rem;
  }
  .brand { font-size: 1rem; }
  .search-box {
    /* 幅が足りない場合は検索欄だけ折り返して2段目に出す（アイコン類は1段目を優先） */
    order: 5;
    flex: 1 1 100%;
    max-width: none;
  }
  .content-area { padding: 1.75rem 1.1rem 2.5rem; }
  .markdown-body { font-size: 0.97rem; }
  .markdown-body h1 { font-size: 1.5rem; }
  .markdown-body h2 { font-size: 1.18rem; margin-top: 2.5rem; }
  .markdown-body td:first-child { min-width: 7em; }
  .quiz-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .quiz-card { padding: 1.1rem; }
  .markdown-body .quiz-question { font-size: 1.05rem; }
  .kw-card { min-height: 280px; padding: 2rem 1.25rem 1.5rem; }
  .markdown-body .quiz-progress-table th, .markdown-body .quiz-progress-table td { padding: 0.55rem 0.6rem; }
}

@media (max-width: 380px) {
  /* さらに狭い画面ではアイコン類も1段目に収まりきらないため、間隔とロゴを詰める */
  .topbar { gap: 0.5rem; }
  .brand { font-size: 0.9rem; }
}

/* タブレット縦以下ではサイドバーを開閉式にして本文の幅を確保する */
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .sidebar {
    position: fixed;
    top: var(--topbar-h, 60px);
    left: 0;
    bottom: 0;
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  }
  .sidebar.open { transform: translateX(0); }
  .nav-overlay.open {
    display: block;
    position: fixed;
    inset: var(--topbar-h, 60px) 0 0 0;
    background: rgba(15, 17, 21, 0.4);
    z-index: 25;
  }
}

/* タッチ操作の端末ではキーボード操作の案内は不要 */
@media (hover: none) and (pointer: coarse) {
  .markdown-body .quiz-hint { display: none; }
  /* iPhone は 16px 未満の入力欄・選択欄にフォーカスすると画面を自動拡大し、元に戻らないため */
  .search-box input, .quiz-select { font-size: 16px; }
}

/* ---- 印刷 ---- */
.doc-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}
.doc-topline .doc-breadcrumb { margin-bottom: 0; }
.doc-print-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}
.doc-print-btn:hover { border-color: var(--accent); color: var(--accent); }
.doc-print-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.print-only { display: none; }

@media print {
  @page { margin: 14mm 12mm; }

  /* ダークテーマ中でも白地・黒文字で印刷する */
  [data-theme="dark"] {
    --bg: #ffffff;
    --bg-elevated: #ffffff;
    --text: #2b2f36;
    --text-strong: #111418;
    --text-muted: #6b7280;
    --border: #e3e5ea;
    --border-strong: #d4d7de;
    --accent: #6246ea;
    --accent-soft: #efebff;
    --marker: #fdeb9e;
    --code-bg: #f2f3f6;
    --sidebar-bg: #fafafb;
    --th-bg: #f6f5fb;
    --row-alt: #fbfbfd;
  }
  html, body { height: auto; background: #fff; }
  body { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .app { display: block; height: auto; }
  .body-layout { display: block; }
  .content-area { padding: 0; overflow: visible; background: #fff; }

  .topbar, .sidebar, .nav-overlay, .toc, .doc-pager, .site-footer,
  .quiz-cta, .code-copy-btn, .doc-print-btn { display: none !important; }

  .markdown-body { max-width: none; font-size: 10.5pt; line-height: 1.7; }
  .markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
    break-after: avoid;
    page-break-after: avoid;
  }
  .markdown-body tr, .markdown-body pre, .markdown-body blockquote, .markdown-body img {
    break-inside: avoid;
    page-break-inside: avoid;
  }
  .table-wrap { overflow: visible; }
  .markdown-body table { font-size: 9.5pt; }
  .markdown-body pre { overflow: visible; white-space: pre-wrap; font-size: 8.5pt; }
  .markdown-body .hljs { background: none; }
  .markdown-body a { color: inherit; text-decoration: none; }

  .markdown-body .print-only { display: block; }
  .markdown-body .print-source {
    margin-top: 2em;
    padding-top: 0.6em;
    border-top: 1px solid #d4d7de;
    font-size: 8pt;
    color: #6b7280;
    word-break: break-all;
  }
}