/* =========================================
   AIで一人個人事業の教科書 / textbook.css
   依存: assets/css/common.css （カラー変数等）
   ----------------------------------------
   common.css で未定義の場合に備え、フォールバック変数を本ファイル冒頭で定義
   ========================================= */

:root {
  --tb-color-primary:    #0066FF;     /* Electric Blue   */
  --tb-color-secondary:  #8A2BE2;     /* Deep Purple     */
  --tb-color-accent:     #FF7A59;     /* Soft Coral      */
  --tb-color-bg:         #FAFBFD;
  --tb-color-bg-alt:     #F2F4F9;
  --tb-color-surface:    #FFFFFF;
  --tb-color-text:       #1A1F2E;
  --tb-color-text-sub:   #5A6478;
  --tb-color-text-mute:  #8C95AA;
  --tb-color-border:     #E5E8F0;
  --tb-color-border-strong: #D1D6E2;
  --tb-color-yayoi:      #1B5E20;
  --tb-color-success:    #16A34A;

  --tb-font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN',
                  'Yu Gothic', Meiryo, sans-serif;

  --tb-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --tb-shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
  --tb-shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);

  --tb-sidebar-width: 280px;
  /* 統一ヘッダー（common.css の .site-header）に合わせて 98px ※PCロゴ70+padding */
  --tb-header-height: 98px;
  --tb-progress-height: 3px;
}

/* モバイル時はヘッダーが小さくなる（ロゴ52+padding） */
@media (max-width: 768px) {
  :root { --tb-header-height: 74px; }
}

/* common.css でカラー変数が定義されている場合は優先 */
:root {
  --color-primary:   var(--tb-color-primary,   #0066FF);
  --color-secondary: var(--tb-color-secondary, #8A2BE2);
  --color-accent:    var(--tb-color-accent,    #FF7A59);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--tb-font-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--tb-color-text);
  background: var(--tb-color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.menu-open { overflow: hidden; }

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* common.css で a { color: inherit } になる場合の保険 */
.chapter-body a:not(.cta-btn-sim):not(.yayoi-link) {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: rgba(0, 102, 255, 0.35);
  text-underline-offset: 2px;
}
.chapter-body a:not(.cta-btn-sim):not(.yayoi-link):hover {
  text-decoration-color: var(--color-primary);
}

img { max-width: 100%; height: auto; }

/* =========================================
   進捗バー
   ========================================= */
.progress-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--tb-progress-height);
  background: rgba(0, 102, 255, 0.08);
  z-index: 1000;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg,
              var(--color-primary) 0%,
              var(--color-secondary) 60%,
              var(--color-accent) 100%);
  transition: width 0.18s ease-out;
}

/* =========================================
   進捗バーは fixed ヘッダーの上に重ねる
   （common.css の .site-header は position:fixed; top:0; z:100）
   ========================================= */
.progress-bar { z-index: 1100; }

/* =========================================
   目次開閉ボタン（モバイル用フローティング）
   旧 .menu-toggle の役割を引き継ぐ。id="menuToggle" は維持
   ========================================= */
.toc-toggle {
  position: fixed;
  top: calc(var(--tb-header-height) + var(--tb-progress-height) + 8px);
  left: 12px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--tb-color-border);
  border-radius: 10px;
  background: var(--tb-color-surface);
  box-shadow: var(--tb-shadow-md);
  cursor: pointer;
  display: none;             /* PCでは非表示。モバイル時のみ表示 */
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  z-index: 950;
}

.toc-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--tb-color-text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.toc-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.toc-toggle.is-open span:nth-child(2) { opacity: 0; }
.toc-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================
   レイアウト
   common.css の .site-header は position:fixed のため
   .layout は上に header 高さ分のオフセットを取る
   ========================================= */
.layout {
  display: flex;
  align-items: flex-start;
  padding-top: var(--tb-header-height);
}

/* サイドバー */
.sidebar {
  width: var(--tb-sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--tb-header-height) + var(--tb-progress-height));
  height: calc(100vh - var(--tb-header-height) - var(--tb-progress-height));
  overflow-y: auto;
  border-right: 1px solid var(--tb-color-border);
  background: var(--tb-color-surface);
  z-index: 100;
}

.sidebar-inner {
  padding: 20px 12px 60px;
}

.sidebar-title {
  padding: 0 8px 12px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--tb-color-text-mute);
  text-transform: uppercase;
  border-bottom: 1px solid var(--tb-color-border);
  margin-bottom: 12px;
}

.toc-group {
  margin-bottom: 18px;
}

.toc-group-label {
  padding: 6px 10px 4px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-secondary);
  text-transform: uppercase;
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc li { margin: 0; }

.toc a {
  display: block;
  padding: 8px 12px;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--tb-color-text-sub);
  border-left: 3px solid transparent;
  border-radius: 0 6px 6px 0;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.toc a:hover {
  background: var(--tb-color-bg-alt);
  color: var(--tb-color-text);
  text-decoration: none;
}

.toc a.is-active {
  color: var(--color-primary);
  background: rgba(0, 102, 255, 0.08);
  border-left-color: var(--color-primary);
  font-weight: 700;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 20, 35, 0.45);
  z-index: 90;
  backdrop-filter: blur(2px);
}

.sidebar-overlay.is-open { display: block; }

/* メインコンテンツ */
.content {
  flex: 1;
  min-width: 0;
  padding: 32px 48px 80px;
  max-width: 920px;
  margin: 0 auto;
}

/* =========================================
   章ブロック
   ========================================= */
.chapter {
  scroll-margin-top: calc(var(--tb-header-height) + var(--tb-progress-height) + 12px);
  padding: 24px 0 48px;
  border-bottom: 1px solid var(--tb-color-border);
}

.chapter:last-of-type { border-bottom: none; }

.chapter-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 20px;
  padding-bottom: 14px;
  border-bottom: 3px solid;
  border-image: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent)) 1;
}

.chapter-icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.10));
}

.chapter-title {
  margin: 0;
  font-size: 26px;
  font-weight: 900;
  line-height: 1.35;
  color: var(--tb-color-text);
  letter-spacing: 0.01em;
}

.chapter-body {
  font-size: 16px;
  line-height: 1.85;
}

/* 本文の見出し */
.chapter-body h3 {
  margin: 36px 0 12px;
  padding: 12px 14px;
  font-size: 19px;
  font-weight: 800;
  color: var(--tb-color-text);
  background: linear-gradient(90deg, rgba(0, 102, 255, 0.08), rgba(138, 43, 226, 0.04) 60%, transparent);
  border-left: 5px solid var(--color-primary);
  border-radius: 0 8px 8px 0;
  scroll-margin-top: calc(var(--tb-header-height) + var(--tb-progress-height) + 12px);
}

.chapter-body h4 {
  margin: 24px 0 10px;
  padding-bottom: 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--color-secondary);
  border-bottom: 2px dotted var(--tb-color-border-strong);
}

.chapter-body h5 {
  margin: 20px 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--tb-color-text);
}

.chapter-body p {
  margin: 14px 0;
}

.chapter-body strong {
  color: var(--tb-color-text);
  font-weight: 800;
  background: linear-gradient(transparent 60%, rgba(255, 122, 89, 0.25) 60%);
  padding: 0 1px;
}

.chapter-body em { color: var(--color-secondary); font-style: normal; font-weight: 600; }

.chapter-body ul, .chapter-body ol {
  margin: 12px 0 14px;
  padding-left: 1.5em;
  list-style: revert;   /* common.css の list-style: none を打ち消す */
}

.chapter-body ul { list-style-type: disc; }
.chapter-body ol { list-style-type: decimal; }

.chapter-body li {
  margin: 4px 0;
}

.chapter-body ul li::marker { color: var(--color-primary); }
.chapter-body ol li::marker { color: var(--color-secondary); font-weight: 700; }

.chapter-body hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--tb-color-border-strong), transparent);
  margin: 32px 0;
}

/* 引用 */
.chapter-body blockquote {
  margin: 18px 0;
  padding: 14px 18px;
  background: linear-gradient(180deg, rgba(0, 102, 255, 0.05), rgba(138, 43, 226, 0.03));
  border-left: 4px solid var(--color-primary);
  border-radius: 0 10px 10px 0;
  color: var(--tb-color-text);
  font-size: 14.5px;
  line-height: 1.75;
}

.chapter-body blockquote p { margin: 6px 0; }
.chapter-body blockquote strong { background: rgba(255, 224, 138, 0.45); }

/* テーブル */
.table-wrap {
  overflow-x: auto;
  margin: 18px 0 22px;
  border: 1px solid var(--tb-color-border);
  border-radius: 12px;
  box-shadow: var(--tb-shadow-sm);
  background: var(--tb-color-surface);
  -webkit-overflow-scrolling: touch;
}

.chapter-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
  white-space: nowrap;
}

.chapter-body th,
.chapter-body td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--tb-color-border);
  text-align: left;
  vertical-align: middle;
}

.chapter-body th {
  background: linear-gradient(180deg, #F4F6FB, #E8ECF5);
  font-weight: 800;
  color: var(--tb-color-text);
  border-bottom: 2px solid var(--tb-color-border-strong);
  position: sticky;
  top: calc(var(--tb-header-height, 56px) + 4px);
}

.chapter-body tbody tr:nth-child(odd)  td { background: #FAFBFE; }
.chapter-body tbody tr:nth-child(even) td { background: #FFFFFF; }
.chapter-body tbody tr:hover td { background: rgba(0, 102, 255, 0.05); }

.chapter-body td strong { background: rgba(255, 122, 89, 0.18); padding: 0 3px; border-radius: 3px; }

/* 数値カラム（右寄せ） */
.chapter-body table td:where(:nth-last-child(-n+5)),
.chapter-body table th:where(:nth-last-child(-n+5)) {
  /* 表によっては数値以外もあるので強制はしない */
}

/* コードブロック */
.chapter-body pre {
  margin: 18px 0;
  padding: 16px 18px;
  background: #0F1729;
  color: #E5E9F2;
  border-radius: 12px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.65;
  font-family: 'Cascadia Mono', 'Consolas', 'Menlo', monospace;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), var(--tb-shadow-sm);
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

.chapter-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.chapter-body code {
  background: rgba(138, 43, 226, 0.08);
  color: var(--color-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Cascadia Mono', 'Consolas', 'Menlo', monospace;
}

/* =========================================
   シミュレータCTA
   ========================================= */
.cta-simulator {
  margin: 22px 0;
  display: flex;
  justify-content: center;
}

.cta-btn-sim {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  font-size: 15px;
  font-weight: 800;
  color: #fff !important;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: 12px;
  text-decoration: none !important;
  box-shadow: 0 6px 18px rgba(0, 102, 255, 0.30), 0 2px 4px rgba(138, 43, 226, 0.18);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  max-width: 100%;
}

.cta-btn-sim:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(0, 102, 255, 0.36), 0 4px 8px rgba(138, 43, 226, 0.20);
}

.cta-btn-sim .cta-icon { font-size: 22px; }
.cta-btn-sim .cta-text { letter-spacing: 0.02em; }
.cta-btn-sim .cta-arrow {
  font-size: 18px; line-height: 1;
  transition: transform 0.18s ease;
}
.cta-btn-sim:hover .cta-arrow { transform: translateX(4px); }

/* =========================================
   弥生CTA（インラインリンク）
   ========================================= */
.yayoi-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: linear-gradient(135deg, #064E22, #1B5E20);
  color: #fff !important;
  font-weight: 700;
  font-size: 13.5px;
  border-radius: 8px;
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--tb-shadow-sm);
  word-break: break-all;
  max-width: 100%;
}

.yayoi-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--tb-shadow-md);
}

.yayoi-badge {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.20);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.yayoi-text {
  word-break: break-all;
}

/* =========================================
   章間ナビ
   ========================================= */
.chapter-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px dashed var(--tb-color-border-strong);
}

.chapter-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--tb-color-surface);
  border: 1px solid var(--tb-color-border);
  border-radius: 12px;
  color: var(--tb-color-text);
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s;
  min-height: 64px;
}

.chapter-nav a:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  box-shadow: var(--tb-shadow-md);
}

.chapter-nav .nav-prev { justify-content: flex-start; }
.chapter-nav .nav-next { justify-content: flex-end; text-align: right; }

.chapter-nav .nav-meta { display: flex; flex-direction: column; min-width: 0; }
.chapter-nav .nav-meta-label { font-size: 11px; color: var(--tb-color-text-mute); letter-spacing: 0.06em; }
.chapter-nav .nav-meta-title { font-size: 14px; font-weight: 700; line-height: 1.3; }

.chapter-nav .nav-arrow {
  font-size: 22px;
  color: var(--color-primary);
  flex-shrink: 0;
  font-weight: 800;
}

/* =========================================
   フッター
   ========================================= */
.site-footer {
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid var(--tb-color-border);
  color: var(--tb-color-text-mute);
  font-size: 12px;
  line-height: 1.7;
  text-align: center;
}

.site-footer p { margin: 4px 0; }

/* =========================================
   Back to top
   ========================================= */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  font-size: 22px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--tb-shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 800;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover { transform: translateY(-2px) scale(1.05); }

/* =========================================
   レスポンシブ
   ========================================= */
@media (max-width: 1024px) {
  .toc-toggle { display: flex; }

  .sidebar {
    position: fixed;
    top: calc(var(--tb-header-height) + var(--tb-progress-height));
    left: 0;
    height: calc(100vh - var(--tb-header-height) - var(--tb-progress-height));
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 4px 0 18px rgba(0, 0, 0, 0.10);
  }

  .sidebar.is-open { transform: translateX(0); }

  .content {
    padding: 24px 24px 64px;
    max-width: 100%;
  }
}

@media (max-width: 640px) {
  .content { padding: 16px 14px 56px; }

  .chapter-header { gap: 10px; padding-bottom: 10px; }
  .chapter-icon { width: 44px; height: 44px; }
  .chapter-title { font-size: 19px; line-height: 1.3; }

  .chapter-body { font-size: 15px; line-height: 1.8; }
  .chapter-body h3 { font-size: 16px; padding: 10px 12px; }
  .chapter-body h4 { font-size: 15px; }

  .chapter-body table { font-size: 12.5px; }
  .chapter-body th, .chapter-body td { padding: 8px 10px; }

  .chapter-body pre { font-size: 11.5px; padding: 12px 14px; }

  .cta-btn-sim { padding: 12px 16px; font-size: 14px; gap: 8px; }
  .cta-btn-sim .cta-text { font-size: 13.5px; }

  .chapter-nav {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .chapter-nav a { min-height: 56px; padding: 12px; }
  .chapter-nav .nav-next { justify-content: flex-start; text-align: left; }
}

/* 印刷時の整形 */
@media print {
  .progress-bar, .site-header, .sidebar, .sidebar-overlay,
  .back-to-top, .chapter-nav, .toc-toggle { display: none !important; }
  .layout { padding-top: 0; }
  .content { max-width: 100%; padding: 0; }
  .chapter { page-break-after: always; border: none; }
  body { background: #fff; }
  .chapter-body pre { background: #f5f5f5; color: #111; }
}

/* 章ページの中央配置 + 表幅強制 */
main.content { margin-left: auto !important; margin-right: auto !important; }
.table-wrap { max-width: 100%; box-sizing: border-box; }
.table-wrap table { min-width: 100%; }

/* 章ページ：sticky thead 解除（site-header との衝突回避） */
body:not(.has-side-toc) .chapter-body table thead th,
body:not(.has-side-toc) .chapter-body table thead {
  position: static !important;
  top: auto !important;
}

/* =========================================================
   Chapter Sidebar TOC (auto-injected by chapter-toc.js)
   ========================================================= */
.ch-layout{
  display:grid;grid-template-columns:240px 1fr;gap:32px;
  max-width:1280px;margin:0 auto;padding:0 24px;
  align-items:start;
}
@media (max-width:1024px){
  .ch-layout{grid-template-columns:1fr;gap:0;padding:0}
}
.ch-layout > main.content{
  margin:0 !important;max-width:100% !important;padding:24px 12px 80px !important;
}

/* Sidebar */
.ch-toc{
  position:sticky;top:90px;align-self:start;
  max-height:calc(100vh - 110px);overflow-y:auto;padding:18px 8px 18px 18px;
  font-size:13px;border-right:1px solid #eef0f4;
  scrollbar-width:thin;
}
@media (max-width:1024px){.ch-toc{display:none}}
.ch-toc h4{
  font-size:11px;font-weight:800;color:#9ca3af;
  letter-spacing:.16em;text-transform:uppercase;margin:0 0 10px;
}
.ch-toc ol, .ch-toc ul{list-style:none;margin:0;padding:0}
.ch-toc li{margin-bottom:1px}
.ch-toc a{
  display:flex;align-items:baseline;gap:8px;
  padding:7px 10px;border-left:2px solid transparent;border-radius:0 6px 6px 0;
  color:#5b6478;font-size:12.5px;line-height:1.5;text-decoration:none;
  transition:all .15s ease;
}
.ch-toc a:hover{color:#0066FF;background:rgba(0,102,255,.04)}
.ch-toc a.is-active{
  color:#0066FF;border-left-color:#0066FF;font-weight:700;background:rgba(0,102,255,.06);
}
.ch-toc .toc-num{
  display:inline-block;min-width:1.8em;font-weight:700;color:#9ca3af;flex-shrink:0;
  white-space:nowrap;
}
.ch-toc .toc-t{flex:1;min-width:0}
.ch-toc-aux li a{padding-left:14px;font-size:12px;color:#6b7280}
.ch-toc-aux li a:hover{color:#0066FF}
.ch-toc-foot{
  margin-top:18px;padding-top:12px;border-top:1px dashed #eef0f4;
  font-size:12px;
}
.ch-toc-foot a{
  color:#0066FF;font-weight:700;text-decoration:none;
}
.ch-toc-foot a:hover{text-decoration:underline}

/* Mobile FAB + Bottom sheet */
.ch-toc-fab{
  display:none;position:fixed;right:20px;bottom:20px;width:54px;height:54px;
  border-radius:50%;background:linear-gradient(135deg,#0066FF 0%,#8A2BE2 100%);
  color:#fff;border:0;cursor:pointer;
  box-shadow:0 12px 30px rgba(11,16,32,.25);z-index:60;
  align-items:center;justify-content:center;font-size:22px;
}
@media (max-width:1024px){.ch-toc-fab{display:flex}}
.ch-toc-overlay{
  position:fixed;inset:0;background:rgba(11,18,38,.55);z-index:60;
  opacity:0;pointer-events:none;transition:opacity .2s ease;
}
.ch-toc-overlay.is-open{opacity:1;pointer-events:auto}
.ch-toc-sheet{display:none;
  position:fixed;left:0;right:0;bottom:0;background:#fff;
  border-radius:18px 18px 0 0;padding:18px 16px calc(28px + env(safe-area-inset-bottom));
  z-index:61;max-height:75vh;overflow-y:auto;
  transform:translateY(100%);transition:transform .25s ease;
}
.ch-toc-sheet.is-open{transform:translateY(0)}
.ch-toc-sheet .handle{
  width:40px;height:4px;border-radius:2px;background:#d1d5db;margin:0 auto 14px;
}
.ch-toc-sheet .ch-toc-inner{
  position:static;border:0;padding:0;max-height:none;overflow:visible;
}

/* Hide the broken old top chapter-nav fallback when sidebar is present */
@media (min-width:1025px){
  .ch-layout .chapter-nav{margin-top:8px}
}

/* Mobile-only sheet visibility */
@media (max-width:1024px){.ch-toc-sheet{display:block !important}}
@media (min-width:1025px){.ch-toc-sheet, .ch-toc-overlay, .ch-toc-fab{display:none !important}}
@media (min-width:1025px){.ch-toc-fab{display:none !important}}

/* =========================================================
   Chapter UX Pack — additions for v2 nav
   ========================================================= */

/* Breadcrumb */
.ch-crumb{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  margin:0 0 16px;font-size:12px;color:#9ca3af;
}
.ch-crumb a{color:#0066FF;text-decoration:none;font-weight:600}
.ch-crumb a:hover{text-decoration:underline}
.ch-crumb .sep{color:#cbd5e1}
.ch-crumb .curr{color:#0b1020;font-weight:700}
.ch-readtime{
  margin-left:auto;
  display:inline-flex;align-items:center;
  padding:4px 10px;border-radius:999px;
  background:linear-gradient(135deg,rgba(0,102,255,.08),rgba(138,43,226,.08));
  border:1px solid rgba(0,102,255,.18);
  font-size:11px;font-weight:700;color:#0066FF;
}

/* Sticky simulator CTA in sidebar */
.ch-toc-cta{
  display:block;margin-top:18px;padding:11px 14px;
  background:linear-gradient(135deg,#0066FF,#8A2BE2);color:#fff !important;
  border-radius:10px;text-decoration:none;font-weight:800;font-size:13px;
  text-align:center;box-shadow:0 6px 14px rgba(0,102,255,.18);
  transition:all .15s ease;
}
.ch-toc-cta:hover{transform:translateY(-1px);box-shadow:0 10px 20px rgba(138,43,226,.25)}

/* End-of-chapter prominent next CTA */
.ch-endnav{
  margin:48px 0 24px;display:grid;gap:14px;
}
.ch-endnav-next{
  display:block;padding:24px 26px;border-radius:14px;text-decoration:none;
  background:linear-gradient(135deg,#0066FF,#8A2BE2);color:#fff !important;
  box-shadow:0 14px 30px -10px rgba(0,102,255,.4);
  transition:all .2s ease;position:relative;overflow:hidden;
}
.ch-endnav-next:hover{transform:translateY(-2px);box-shadow:0 22px 44px -10px rgba(138,43,226,.5)}
.ch-endnav-next .ll{font-size:11px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;opacity:.85;margin-bottom:6px}
.ch-endnav-next .title{font-size:22px;font-weight:900;margin-bottom:6px;line-height:1.3}
.ch-endnav-next .lead{font-size:13px;opacity:.9;line-height:1.6;margin-bottom:14px}
.ch-endnav-next .cta{
  display:inline-block;padding:6px 14px;border-radius:999px;
  background:rgba(255,255,255,.18);font-size:12px;font-weight:800;
  border:1px solid rgba(255,255,255,.3);
}
.ch-endnav-finish{background:linear-gradient(135deg,#0E8A5F,#0066FF)}
.ch-endnav-prev{
  display:block;padding:14px 20px;border:1px solid #e5e7eb;border-radius:10px;
  text-decoration:none;color:#1f2937;background:#fff;
  transition:all .15s ease;
}
.ch-endnav-prev:hover{border-color:#0066FF;color:#0066FF;transform:translateY(-1px)}
.ch-endnav-prev .ll{font-size:11px;font-weight:700;color:#9ca3af;margin-bottom:2px}
.ch-endnav-prev .title{font-size:14px;font-weight:800}

/* Recommended cards */
.ch-recommend{margin:24px 0 16px;padding:24px;border-radius:14px;background:#f7f8fb;border:1px solid #eef0f4}
.ch-recommend-h{
  font-size:11px;font-weight:800;letter-spacing:.18em;text-transform:uppercase;
  color:#8A2BE2;margin-bottom:12px;
}
.ch-recommend-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width:780px){.ch-recommend-grid{grid-template-columns:1fr}}
.ch-rec-card{
  display:block;padding:16px 18px;background:#fff;border:1px solid #e5e7eb;
  border-radius:10px;text-decoration:none;color:#0b1020;
  transition:all .2s ease;
}
.ch-rec-card:hover{border-color:#0066FF;transform:translateY(-2px);box-shadow:0 12px 24px -10px rgba(0,102,255,.2)}
.ch-rec-card .num{
  display:inline-block;font-size:11px;font-weight:800;letter-spacing:.16em;
  color:#0066FF;margin-bottom:6px;
}
.ch-rec-card .t{font-size:14px;font-weight:800;margin-bottom:6px;line-height:1.4}
.ch-rec-card .l{font-size:12px;color:#6b7280;line-height:1.6}

/* Completion badge */
.ch-cert{
  display:flex;align-items:center;gap:16px;
  margin:0 0 24px;padding:18px 22px;border-radius:14px;
  background:linear-gradient(135deg,rgba(14,138,95,.1),rgba(0,102,255,.1));
  border:1px solid rgba(14,138,95,.25);
}
.ch-cert-icon{font-size:36px;flex-shrink:0}
.ch-cert-title{font-size:15px;font-weight:900;color:#0b1020;margin-bottom:2px}
.ch-cert-sub{font-size:12px;color:#374151;line-height:1.6}
.ch-cert-sub a{color:#0066FF;font-weight:700;text-decoration:underline;text-underline-offset:2px}

/* Header dropdown */
.nav-dd{position:relative;display:inline-flex;align-items:center}
.nav-dd-trigger{display:inline-flex;align-items:center;gap:4px}
.nav-dd-caret{font-size:10px;opacity:.6;transition:transform .15s ease}
.nav-dd.is-open .nav-dd-caret{transform:rotate(180deg)}
.nav-dd-menu{
  position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);
  min-width:280px;background:#fff;border:1px solid #e5e7eb;
  border-radius:14px;box-shadow:0 18px 40px -12px rgba(11,16,32,.18);
  padding:8px;z-index:100;
  opacity:0;pointer-events:none;transition:opacity .15s ease, transform .15s ease;
}
.nav-dd.is-open .nav-dd-menu{
  opacity:1;pointer-events:auto;transform:translateX(-50%) translateY(0);
}
.nav-dd-item{
  display:flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:8px;text-decoration:none;
  font-size:13px;color:#0b1020;transition:background .12s;
}
.nav-dd-item:hover{background:rgba(0,102,255,.06);color:#0066FF}
.nav-dd-head{font-weight:800;color:#0066FF !important}
.nav-dd-ch{padding:6px 12px;font-size:12.5px}
.nav-dd-num{
  display:inline-block;min-width:1.8em;font-weight:800;color:#9ca3af;font-size:11px;
}
.nav-dd-sep{height:1px;background:#eef0f4;margin:6px 8px}
@media (max-width:980px){
  .nav-dd-menu{display:none}
}