:root {
  --bg: #faf8f4;
  --bg2: #f0ece4;
  --bg3: #e8e2d8;
  --text: #2c2417;
  --text2: #5a4e3a;
  --text3: #8a7a62;
  --accent: #7b4f2e;
  --accent2: #a06c3e;
  --link: #5c3d1e;
  --border: #d4c9b4;
  --blockquote-bg: #f5f0e8;
  --blockquote-border: #c4a882;
  --drawer-bg: #fdf9f4;
  --shadow: rgba(0,0,0,0.12);
  --toolbar-bg: rgba(250,248,244,0.95);
  --fs-base: 20px;
  --fs-step: 2px;
  --max-w: 780px;
  --radius: 6px;
  --transition: 0.2s ease;
  --font-body: Tahoma, Geneva, Verdana, 'Segoe UI', system-ui, sans-serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
  --bg: #1a1610;
  --bg2: #221e18;
  --bg3: #2c2820;
  --text: #e8dfc8;
  --text2: #b8a888;
  --text3: #7a6e58;
  --accent: #d4956a;
  --accent2: #c47a50;
  --link: #e0a87a;
  --border: #3c3428;
  --blockquote-bg: #231f18;
  --blockquote-border: #6a4e2e;
  --drawer-bg: #1e1a14;
  --shadow: rgba(0,0,0,0.4);
  --toolbar-bg: rgba(26,22,16,0.96);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: var(--fs-base); }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

/* ── TOOLBAR ── */
#toolbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--toolbar-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 8px 14px 7px;
  transition: background var(--transition), border-color var(--transition);
}

.tb-row {
  display: flex;
  align-items: center;
  gap: 7px;
}

.tb-row1 {
  justify-content: center;
  margin-bottom: 7px;
}

.tb-chapter-label {
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 4vw, 1.6rem);
  font-weight: normal;
  color: var(--accent);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.02em;
}

.tb-nav-group {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: 1;
}

.tb-right-group {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
}

/* Nav icon buttons: ☰ ◀ ▶ */
.tb-nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg2);
  color: var(--text2);
  cursor: pointer;
  font-size: 16px;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  user-select: none;
  flex-shrink: 0;
  line-height: 1;
}

.tb-nav-btn:hover {
  background: var(--bg3);
  border-color: var(--accent);
  color: var(--accent);
}

.tb-nav-btn.disabled {
  opacity: 0.28;
  cursor: default;
  pointer-events: none;
}

.tb-nav-btn.toc-btn { font-size: 18px; }

/* Right-side action buttons: VI / A− / A+ / ☾ */
.tb-right-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  min-width: 40px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg2);
  color: var(--text);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  user-select: none;
  white-space: nowrap;
}

.tb-right-btn:hover {
  background: var(--bg3);
  border-color: var(--accent);
  color: var(--accent);
}

.tb-right-btn:active { transform: scale(0.96); }

/* ── DRAWER ── */
#drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 200;
  backdrop-filter: blur(2px);
}

#drawer-overlay.open { display: block; }

#drawer {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: min(320px, 88vw);
  background: var(--drawer-bg);
  border-right: 1px solid var(--border);
  z-index: 201;
  transform: translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 24px var(--shadow);
}

#drawer.open { transform: translateX(0); }

#drawer-header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  background: var(--drawer-bg);
  z-index: 1;
}

#drawer-title {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text3);
}

#drawer-close {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: var(--text2);
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}

#drawer-close:hover { color: var(--accent); }

#drawer-body { padding: 8px 0 16px; flex: 1; }

.drawer-section-link {
  display: block;
  padding: 7px 16px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text2);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), padding-left var(--transition);
  border-left: 3px solid transparent;
}

.drawer-section-link:hover {
  background: var(--bg2);
  color: var(--accent);
  padding-left: 20px;
}

.drawer-section-link.current {
  border-left-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
  background: var(--bg2);
}

.drawer-rule-link {
  display: block;
  padding: 4px 16px 4px 24px;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text3);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
  line-height: 1.4;
}

.drawer-rule-link:hover {
  background: var(--bg2);
  color: var(--accent2);
  border-left-color: var(--accent2);
  padding-left: 28px;
}

.drawer-rule-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--bg2);
}

.drawer-sub-title {
  padding: 10px 16px 4px;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
}

.drawer-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 16px;
}

/* ── CONTENT ── */
#content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 32px 20px 80px;
}

.lang-block { display: block; }
.lang-block.hidden { display: none; }

/* ── INDEX PAGE ── */
.index-header {
  text-align: center;
  padding: 40px 20px 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.index-header h1 {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: normal;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin-bottom: 8px;
  font-family: var(--font-body);
}

.index-header .subtitle {
  font-size: 0.95rem;
  color: var(--text3);
  font-family: var(--font-sans);
}

.toc-list {
  list-style: none;
  display: grid;
  gap: 10px;
}

.toc-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg2);
  transition: border-color var(--transition), background var(--transition), transform 0.15s ease, box-shadow 0.15s ease;
}

.toc-item:hover {
  border-color: var(--accent2);
  background: var(--bg3);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--shadow);
}

.toc-item a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 18px;
  text-decoration: none;
  color: inherit;
}

.toc-num {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  color: var(--text3);
  letter-spacing: 0.08em;
  flex-shrink: 0;
  min-width: 36px;
}

.toc-name {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.4;
  transition: color var(--transition);
}

.toc-item:hover .toc-name { color: var(--accent); }

.toc-meta {
  margin-left: auto;
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--text3);
  flex-shrink: 0;
}

/* Search */
#index-search {
  display: block;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto 20px;
  padding: 10px 16px;
  font-size: 15px;
  font-family: var(--font-sans);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg2);
  color: var(--text);
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

#index-search:focus { border-color: var(--accent); }
#index-search::placeholder { color: var(--text3); }

/* ── SECTION PAGE ── */
.section-title {
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  font-weight: normal;
  color: var(--accent);
  margin: 0 0 8px;
  line-height: 1.3;
}

h2.section-title {
  font-size: clamp(1.1rem, 3.5vw, 1.5rem);
  margin-top: 4px;
  color: var(--text2);
}

.rule-heading {
  font-size: clamp(1rem, 3vw, 1.25rem);
  margin: 2rem 0 0.6rem;
  padding: 0.5rem 0 0.5rem 14px;
  border-left: 3px solid var(--accent2);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.35;
}

.anchor-link {
  font-size: 0.75em;
  color: var(--text3);
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--transition);
  flex-shrink: 0;
}

.rule-heading:hover .anchor-link { opacity: 1; }

.sub-heading {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.4rem 0 0.4rem;
  color: var(--text2);
  font-style: italic;
}

.sub-sub-heading {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 1.1rem 0 0.3rem;
  color: var(--text2);
}

p {
  margin: 0.7em 0;
  text-align: justify;
  hyphens: auto;
}

blockquote {
  margin: 1em 0;
  padding: 12px 16px;
  background: var(--blockquote-bg);
  border-left: 4px solid var(--blockquote-border);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text2);
  font-style: italic;
  transition: background var(--transition), border-color var(--transition);
}

blockquote p { margin: 0.4em 0; }

ul, ol {
  margin: 0.6em 0 0.6em 1.4em;
  padding: 0;
}

li { margin: 0.2em 0; }

code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.88em;
  background: var(--bg3);
  padding: 1px 5px;
  border-radius: 3px;
}

hr.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

em { font-style: italic; }
strong { font-weight: 700; }

/* ── NAVIGATION ── */
.nav-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 24px 0;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.nav-row.top { border-top: none; border-bottom: 1px solid var(--border); margin-top: 0; padding-bottom: 12px; margin-bottom: 24px; }

.nav-btn {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg2);
  color: var(--text2);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.nav-btn:hover {
  background: var(--bg3);
  border-color: var(--accent);
  color: var(--accent);
}

.nav-btn.home {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.nav-btn.home:hover { background: var(--accent2); border-color: var(--accent2); }

.nav-spacer { flex: 1; }

/* ── GLOSSARY TOOLTIP ── */
abbr.gl-term {
  text-decoration: underline dotted var(--text3);
  cursor: help;
  position: relative;
}

abbr.gl-term[title]:hover::after,
abbr.gl-term[title]:focus::after {
  content: attr(title);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  font-family: var(--font-sans);
  font-size: 12px;
  font-style: normal;
  line-height: 1.4;
  padding: 6px 10px;
  border-radius: var(--radius);
  white-space: normal;
  max-width: 240px;
  min-width: 120px;
  z-index: 50;
  box-shadow: 0 4px 16px var(--shadow);
  pointer-events: none;
  text-align: left;
  word-break: break-word;
}

abbr.gl-term[title]:hover::before,
abbr.gl-term[title]:focus::before {
  content: "";
  position: absolute;
  bottom: calc(100% + 1px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--text);
  z-index: 51;
}

/* ── SCROLL SPY HIGHLIGHT ── */
.rule-heading.spy-active {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* ── RESPONSIVE ── */
@media (max-width: 480px) {
  #content { padding: 20px 14px 60px; }
  .tb-btn { font-size: 12px; padding: 5px 8px; }
  .nav-btn { font-size: 12px; padding: 6px 10px; }
  .toc-item a { padding: 12px 14px; gap: 8px; }
  .toc-meta { display: none; }
  #index-search { font-size: 14px; }
  p { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ── INDEX WORD COUNT BADGE ── */
.wc-badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 20px;
  background: var(--bg3);
  color: var(--text3);
  border: 1px solid var(--border);
  margin-left: 4px;
  vertical-align: middle;
  white-space: nowrap;
}

/* ── PART MARKER (hidden, internal) ── */
.part-break { display: none; }