/* =========================================
   1delta — Simple Sidebar (theme-aware)
   ========================================= */

/* ---------- Theme variables ---------- */

/* Default / White */
.book[data-theme="white"], .book:not([data-theme]) {
  --nav-bg: #f8fafc;
  --nav-fg: #687485;
  --nav-muted: #6b7280;
  --nav-border: #e5e7eb;
  --nav-hover: #eef2f7;
  --nav-active-bg: #e8f1ff;
  --nav-accent: #2563eb;
  --scroll-track: rgba(0,0,0,.05);
  --scroll-thumb: rgba(0,0,0,.25);
  --scroll-thumb-hover: rgba(0,0,0,.45);
}

/* Sepia */
.book[data-theme="sepia"] {
  --nav-bg: #efe7d2;
  --nav-fg: #3b2f2a;
  --nav-muted: #6f5f56;
  --nav-border: #dfd4bc;
  --nav-hover: #f6eed9;
  --nav-active-bg: #efe0c9;
  --nav-accent: #9a6b39;
  --scroll-track: rgba(0,0,0,.08);
  --scroll-thumb: rgba(0,0,0,.28);
  --scroll-thumb-hover: rgba(0,0,0,.45);
}

/* Night */
.book[data-theme="night"] {
  --nav-bg: #111a27;
  --nav-fg: #d0d4db;
  --nav-muted: #aab3bf;
  --nav-border: #1c2a3b;
  --nav-hover: #0f1823;
  --nav-active-bg: rgba(121,184,255,.14);
  --nav-accent: #79b8ff;
  --scroll-track: rgba(255,255,255,.06);
  --scroll-thumb: rgba(255,255,255,.20);
  --scroll-thumb-hover: rgba(255,255,255,.35);
}

/* ---------- Base panel ---------- */
.book .book-summary {
  background: var(--nav-bg);
  color: var(--nav-fg);
  border-right: 1px solid var(--nav-border);
}

.book .book-summary .summary {
  padding: 12px;
  font-size: 15px;
  line-height: 1.45;
}

/* remove bullets everywhere */
.book .book-summary .summary ul,
.book .book-summary .summary li { list-style: none; }

/* ---------- Top title (first item) ---------- */
.book .book-summary .summary > li:first-child h1,
.book .book-summary .summary > li:first-child h2 {
  margin: 8px 8px 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .3px;
  text-transform: uppercase;
  color: var(--nav-muted);
}

/* ---------- Links ---------- */
.book .book-summary .summary a {
  color: var(--nav-fg);
  text-decoration: none;
}

/* top-level chapters */
.book .book-summary .summary li.chapter > a {
  display: block;
  padding: 8px 10px;
  margin: 2px 4px;
  border-radius: 8px;
}

/* hover & focus */
.book .book-summary .summary li.chapter > a:hover {
  background: var(--nav-hover);
}
.book .book-summary .summary li.chapter > a:focus {
  outline: 2px solid var(--nav-accent);
  outline-offset: 2px;
}

/* active page */
.book .book-summary .summary li.chapter.active > a,
.book .book-summary .summary li.chapter > ul.articles > li.active > a {
  background: var(--nav-active-bg);
  color: var(--nav-fg);
}

/* ---------- Nesting ---------- */
.book .book-summary .summary li.chapter > ul.articles {
  margin: 2px 0 6px;
  padding-left: 12px; /* simple indent */
}

.book .book-summary .summary li.chapter > ul.articles > li > a {
  display: block;
  padding: 6px 8px;
  margin: 1px 4px;
  border-radius: 6px;
  color: var(--nav-fg);
}

.book .book-summary .summary li.chapter > ul.articles > li > a:hover {
  background: var(--nav-hover);
}

/* deeper levels: a touch more indent */
.book .book-summary .summary li li ul {
  margin: 2px 0;
  padding-left: 12px;
}
.book .book-summary .summary li li ul li a {
  display: block;
  padding: 5px 8px;
  margin: 1px 4px;
  border-radius: 6px;
  color: var(--nav-muted);
}
.book .book-summary .summary li li ul li a:hover {
  background: var(--nav-hover);
  color: var(--nav-fg);
}

/* ---------- Caret (minimal) ---------- */
/* your JS adds <span class="caret"> inside the <a> */
.book .book-summary .chapter.has-children > a {
  padding-left: 26px; /* room for caret */
  position: relative;
}
.book .book-summary .chapter > a .caret {
  position: absolute;
  left: 10px;
  top: 50%;
  width: 0; height: 0;
  transform: translateY(-50%) rotate(0deg);
  border-left: 6px solid var(--nav-muted);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: transform .12s ease, border-color .12s ease;
}
.book .book-summary .chapter.expanded > a .caret {
  transform: translateY(-50%) rotate(90deg);
  border-left-color: var(--nav-accent);
}

/* ---------- Scrollbar (subtle) ---------- */
.book .book-summary .summary::-webkit-scrollbar { width: 10px; }
.book .book-summary .summary::-webkit-scrollbar-track { background: transparent; }
.book .book-summary .summary::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--nav-fg) 20%, transparent);
  border-radius: 6px;
}
.book .book-summary .summary::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--nav-fg) 35%, transparent);
}
.book .book-summary .summary {
  scrollbar-color: color-mix(in srgb, var(--nav-fg) 20%, transparent) transparent;
}

/* =========================================
   Sidebar Scrollbar (thin, theme-aware)
   ========================================= */
.book .book-summary .summary {
  scrollbar-width: thin; /* Firefox */
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

/* WebKit / Blink */
.book .book-summary .summary::-webkit-scrollbar {
  width: 6px;            /* thin */
}
.book .book-summary .summary::-webkit-scrollbar-track {
  background: var(--scroll-track);
}
.book .book-summary .summary::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 6px;
}
.book .book-summary .summary::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
}

/* =========================================
   Sidebar Scrollbar — robust + theme-aware
   (apply to BOTH possible scroll containers)
   ========================================= */

/* Ensure one (or both) are actually scroll containers */
.book .book-summary,
.book .book-summary .summary {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Firefox */
.book .book-summary,
.book .book-summary .summary {
  scrollbar-width: thin; /* <— thin in Firefox */
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

/* WebKit/Blink */
.book .book-summary::-webkit-scrollbar,
.book .book-summary .summary::-webkit-scrollbar {
  width: 6px;
}

.book .book-summary::-webkit-scrollbar-track,
.book .book-summary .summary::-webkit-scrollbar-track {
  background: var(--scroll-track);
}

.book .book-summary::-webkit-scrollbar-thumb,
.book .book-summary .summary::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 6px;
}

.book .book-summary::-webkit-scrollbar-thumb:hover,
.book .book-summary .summary::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
}

/* Make sure headers are visible even if code.css loads late */
pre[class*="language-"],
pre {
  position: relative;
}

pre .code-header {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 36px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  background: var(--code-surface, rgba(0,0,0,.4));
  color: var(--code-dim, #c8d1dc);
  border-bottom: 1px solid rgba(255,255,255,.12);
  z-index: 1;
}

pre .code-header .lights { display: inline-flex; gap: 6px; margin-right: 8px; }
pre .code-header .lights i { width: 10px; height: 10px; border-radius: 50%; background:#ff5f57; box-shadow: inset 0 0 0 1px rgba(0,0,0,.2); }
pre .code-header .lights i:nth-child(2){ background:#febc2e; }
pre .code-header .lights i:nth-child(3){ background:#28c840; }

pre .code-header .label { font-size: 12px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.15); padding: 2px 8px; border-radius: 999px; line-height: 1; }
pre .code-header .spacer { flex: 1 1 auto; }
pre .code-header .copy-btn { border: 1px solid rgba(255,255,255,.2); background: transparent; color: inherit; padding: 4px 8px; border-radius: 8px; font-size: 12px; cursor: pointer; }
pre .code-header .copy-btn:hover { background: rgba(255,255,255,.06); }