/* ============================================================
 * BabiaWeb — Vue-flavored docs site (template ref: 32_vue)
 * Brand color: #14B8A6 (teal-green, distinct from Vue #42b883)
 * Layout: top header + left sidebar (folding doc tree) + main + right TOC
 * Vue signature: clean white background, round-corner cards (10–14px),
 *   modern sans typography, generous spacing, subtle shadows, brand-color
 *   accents on links/buttons/active states. We swap Vue's signature green
 *   to teal #14B8A6 across the whole system.
 * Class prefix: bw- (BabiaWeb), no shared CSS with peers.
 * ============================================================ */

:root {
  /* === Brand teal palette === */
  --bw-c1: #14B8A6;
  --bw-c2: #0EA396;
  --bw-c3: #0E8F82;
  --bw-c-soft: #99F6E4;
  --bw-c-tint: #ECFDF5;
  --bw-c-tint2: #D1FAE5;
  --bw-c-line: #A7F3D0;
  --bw-c-glow: rgba(20, 184, 166, 0.18);

  /* === Surfaces === */
  --bw-bg: #FFFFFF;
  --bw-bg-alt: #F8FAFC;
  --bw-bg-soft: #F1F5F9;
  --bw-bg-code: #F6F8FA;
  --bw-bg-codeblock: #0F172A;
  --bw-bg-codeblock-text: #E2E8F0;
  --bw-bg-callout-info: #ECFDF5;
  --bw-bg-callout-warn: #FEF3C7;
  --bw-bg-callout-tip:  #EFF6FF;
  --bw-bg-card: #FFFFFF;
  --bw-bg-overlay: rgba(15, 23, 42, 0.55);

  /* === Text === */
  --bw-text: #0F172A;
  --bw-text-2: #1F2937;
  --bw-text-mut: #475569;
  --bw-text-soft: #64748B;
  --bw-text-faint: #94A3B8;
  --bw-text-on-brand: #FFFFFF;

  /* === Lines === */
  --bw-line: #E2E8F0;
  --bw-line-soft: #EEF2F7;
  --bw-line-strong: #CBD5E1;

  /* === Links === */
  --bw-link: #0EA396;
  --bw-link-hover: #0E8F82;
  --bw-link-visited: #6D28D9;

  /* === Misc === */
  --bw-radius-sm: 6px;
  --bw-radius: 10px;
  --bw-radius-md: 12px;
  --bw-radius-lg: 16px;
  --bw-radius-xl: 22px;

  --bw-shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --bw-shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.04);
  --bw-shadow-md: 0 4px 14px rgba(15, 23, 42, 0.07), 0 2px 4px rgba(15, 23, 42, 0.04);
  --bw-shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.10), 0 4px 8px rgba(15, 23, 42, 0.05);
  --bw-shadow-brand: 0 8px 24px rgba(20, 184, 166, 0.18);

  --bw-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Sans GB", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --bw-mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", "Source Code Pro", Consolas, "Roboto Mono", monospace;

  --bw-header-h: 64px;
  --bw-sidebar-w: 268px;
  --bw-toc-w: 224px;
  --bw-content-max: 780px;
  --bw-page-max: 1440px;

  --bw-trans: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bw-bg: #0B1220;
  --bw-bg-alt: #0F172A;
  --bw-bg-soft: #1E293B;
  --bw-bg-code: #131C2E;
  --bw-bg-codeblock: #0A0F1C;
  --bw-bg-codeblock-text: #CBD5E1;
  --bw-bg-callout-info: rgba(20, 184, 166, 0.10);
  --bw-bg-callout-warn: rgba(217, 119, 6, 0.12);
  --bw-bg-callout-tip:  rgba(59, 130, 246, 0.10);
  --bw-bg-card: #0F172A;
  --bw-text: #E2E8F0;
  --bw-text-2: #CBD5E1;
  --bw-text-mut: #94A3B8;
  --bw-text-soft: #64748B;
  --bw-text-faint: #475569;
  --bw-line: #1E293B;
  --bw-line-soft: #182032;
  --bw-line-strong: #334155;
  --bw-link: #2DD4BF;
  --bw-link-hover: #5EEAD4;
  --bw-c-tint: rgba(20, 184, 166, 0.10);
  --bw-c-tint2: rgba(20, 184, 166, 0.18);
}

/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--bw-header-h) + 12px); }
body.bw-body {
  font-family: var(--bw-font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--bw-text);
  background: var(--bw-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg, video { max-width: 100%; height: auto; }
a { color: var(--bw-link); text-decoration: none; transition: color var(--bw-trans); }
a:hover { color: var(--bw-link-hover); }
button { font-family: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; }
::selection { background: var(--bw-c-soft); color: var(--bw-text); }

/* ===== Header (Vue style: clean white sticky bar with subtle bottom line) ===== */
.bw-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--bw-line);
}
[data-theme="dark"] .bw-header { background: rgba(11, 18, 32, 0.84); }
.bw-header__bar { width: 100%; }
.bw-header__inner {
  display: flex; align-items: center; gap: 16px;
  height: var(--bw-header-h);
  max-width: var(--bw-page-max);
  margin: 0 auto;
  padding: 0 28px;
}
.bw-brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700;
  color: var(--bw-text);
  flex-shrink: 0;
}
.bw-brand:hover { color: var(--bw-text); }
.bw-brand__mark { display: inline-flex; align-items: center; }
.bw-brand__name {
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--bw-text);
}
.bw-brand__tag {
  display: inline-flex; align-items: center;
  height: 18px; padding: 0 6px;
  font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--bw-c1);
  background: var(--bw-c-tint);
  border: 1px solid var(--bw-c-line);
  border-radius: 999px;
}

/* Search box in header */
.bw-search {
  position: relative;
  flex: 0 1 280px;
  max-width: 320px;
  margin-left: 12px;
}
.bw-search__icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--bw-text-faint);
  display: inline-flex; align-items: center; pointer-events: none;
}
.bw-search__input {
  width: 100%;
  height: 38px;
  padding: 0 56px 0 36px;
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  background: var(--bw-bg-alt);
  color: var(--bw-text);
  font-size: 14px;
  outline: none;
  transition: border-color var(--bw-trans), box-shadow var(--bw-trans), background var(--bw-trans);
}
.bw-search__input:focus {
  border-color: var(--bw-c1);
  background: var(--bw-bg);
  box-shadow: 0 0 0 4px var(--bw-c-glow);
}
.bw-search__hint {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  display: inline-flex; align-items: center; justify-content: center;
  height: 22px; min-width: 32px; padding: 0 6px;
  font-size: 11px; font-family: var(--bw-mono); font-weight: 600;
  color: var(--bw-text-soft);
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: 6px;
}

/* Top nav */
.bw-topnav {
  display: inline-flex; align-items: center; gap: 4px;
  margin-left: auto;
}
.bw-topnav__item {
  display: inline-flex; align-items: center;
  height: 36px; padding: 0 12px;
  font-size: 14px; font-weight: 500;
  color: var(--bw-text-mut);
  border-radius: 8px;
  transition: color var(--bw-trans), background var(--bw-trans);
}
.bw-topnav__item:hover { color: var(--bw-c1); background: var(--bw-c-tint); }
.bw-topnav__item.is-active { color: var(--bw-c1); background: var(--bw-c-tint); }

/* Right cluster (lang + theme) */
.bw-header__right { display: inline-flex; align-items: center; gap: 6px; margin-left: 4px; }
.bw-iconbtn {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 8px;
  color: var(--bw-text-mut);
  cursor: pointer;
  transition: color var(--bw-trans), background var(--bw-trans), border-color var(--bw-trans);
}
.bw-iconbtn:hover { color: var(--bw-c1); background: var(--bw-c-tint); }

/* Lang dropdown */
.bw-lang { position: relative; }
.bw-lang__btn {
  height: 36px; padding: 0 10px;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px;
  background: transparent;
  border: 1px solid var(--bw-line);
  border-radius: 8px;
  color: var(--bw-text-mut);
  cursor: pointer;
  transition: border-color var(--bw-trans), color var(--bw-trans);
}
.bw-lang__btn:hover { border-color: var(--bw-c1); color: var(--bw-c1); }
.bw-lang__cur { font-weight: 600; }
.bw-lang__menu {
  position: absolute; right: 0; top: calc(100% + 6px);
  min-width: 168px;
  margin: 0; padding: 6px;
  list-style: none;
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  box-shadow: var(--bw-shadow-lg);
  display: none;
  z-index: 80;
}
.bw-lang.is-open .bw-lang__menu { display: block; }
.bw-lang__menu li { list-style: none; }
.bw-lang__menu a {
  display: block; padding: 8px 12px;
  font-size: 14px;
  color: var(--bw-text-mut);
  border-radius: 6px;
}
.bw-lang__menu a:hover { background: var(--bw-c-tint); color: var(--bw-c1); }
.bw-lang__menu a.is-current { background: var(--bw-c-tint); color: var(--bw-c1); font-weight: 600; }

.bw-themebtn .bw-theme-dark { display: none; }
.bw-themebtn .bw-theme-light { display: inline-flex; }
[data-theme="dark"] .bw-themebtn .bw-theme-light { display: none; }
[data-theme="dark"] .bw-themebtn .bw-theme-dark { display: inline-flex; }

/* ===== Shell (3-col layout) ===== */
.bw-shell {
  max-width: var(--bw-page-max);
  margin: 0 auto;
  padding: 0 28px;
  display: block;
}
.bw-shell--has-sidebar {
  display: grid;
  grid-template-columns: var(--bw-sidebar-w) minmax(0, 1fr);
  gap: 36px;
  align-items: flex-start;
}

/* ===== Sidebar (Vue-style folding doc tree) ===== */
.bw-sidebar {
  position: sticky;
  top: var(--bw-header-h);
  height: calc(100vh - var(--bw-header-h));
  overflow-y: auto;
  padding: 24px 8px 60px 0;
  border-right: 1px solid var(--bw-line);
  scrollbar-width: thin;
  scrollbar-color: var(--bw-line) transparent;
}
.bw-sidebar::-webkit-scrollbar { width: 8px; }
.bw-sidebar::-webkit-scrollbar-thumb { background: var(--bw-line); border-radius: 4px; }
.bw-sidebar__head {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px 12px;
  border-bottom: 1px solid var(--bw-line);
  margin-bottom: 12px;
}
.bw-sidebar__brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600;
  color: var(--bw-text);
}
.bw-sidebar__inner { padding: 0 4px; }
.bw-sidebar__group { margin-bottom: 6px; }
.bw-sidebar__group--root { padding-bottom: 8px; border-bottom: 1px solid var(--bw-line-soft); margin-bottom: 14px; }

.bw-sidebar__heading {
  width: 100%;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px;
  margin: 0;
  font-size: 14px; font-weight: 600;
  color: var(--bw-text);
  background: transparent;
  border: 0; outline: 0;
  text-align: left;
  border-radius: 6px;
  cursor: default;
}
.bw-sidebar__heading--clickable { cursor: pointer; }
.bw-sidebar__heading--clickable:hover { background: var(--bw-bg-alt); }
.bw-sidebar__chev {
  display: inline-flex; align-items: center;
  color: var(--bw-text-faint);
  transition: transform var(--bw-trans);
}
.bw-sidebar__group.is-collapsed .bw-sidebar__chev { transform: rotate(-90deg); }
.bw-sidebar__hname { flex: 1; }
.bw-sidebar__hcount {
  font-size: 11px; font-weight: 500;
  color: var(--bw-text-faint);
  background: var(--bw-bg-alt);
  border-radius: 999px;
  padding: 1px 8px;
}

.bw-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 0;
}
.bw-sidebar__list--inner {
  padding-left: 16px;
  margin-top: 2px;
  border-left: 1px solid var(--bw-line-soft);
  margin-left: 14px;
}
.bw-sidebar__group.is-collapsed .bw-sidebar__list--inner { display: none; }
.bw-sidebar__list li { list-style: none; margin: 0; }
.bw-sidebar__link {
  display: block;
  padding: 6px 10px;
  font-size: 13.5px;
  color: var(--bw-text-mut);
  border-radius: 6px;
  transition: color var(--bw-trans), background var(--bw-trans);
  line-height: 1.45;
}
.bw-sidebar__link:hover { color: var(--bw-c1); background: var(--bw-bg-alt); }
.bw-sidebar__link.is-active {
  color: var(--bw-c1);
  background: var(--bw-c-tint);
  font-weight: 600;
}
.bw-sidebar__link--cat { color: var(--bw-text-soft); font-style: italic; font-size: 13px; }

/* ===== Main column ===== */
.bw-main {
  min-width: 0;
  padding: 28px 0 80px;
}
.bw-main--full {
  max-width: var(--bw-page-max);
  margin: 0 auto;
  padding: 24px 28px 80px;
}

/* ===== Article ===== */
.bw-article { min-width: 0; }
.bw-article__head { margin: 4px 0 28px; }
.bw-article__kicker {
  display: inline-block;
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em;
  color: var(--bw-c1);
  text-transform: uppercase;
  padding: 4px 10px;
  background: var(--bw-c-tint);
  border-radius: 999px;
  margin-bottom: 12px;
}
.bw-article__h1 {
  margin: 0 0 12px;
  font-size: 36px; font-weight: 800; letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--bw-text);
}
.bw-article__lede {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.65;
  color: var(--bw-text-mut);
  max-width: 70ch;
}
.bw-article__meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-size: 13.5px;
  color: var(--bw-text-soft);
}
.bw-article__meta-sep { color: var(--bw-text-faint); }
.bw-chip {
  display: inline-flex; align-items: center;
  height: 22px; padding: 0 10px;
  font-size: 12px; font-weight: 500;
  color: var(--bw-c1);
  background: var(--bw-c-tint);
  border: 1px solid var(--bw-c-line);
  border-radius: 999px;
  text-decoration: none;
}
.bw-chip:hover { background: var(--bw-c-tint2); color: var(--bw-c2); }

/* Crumb */
.bw-crumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  margin: 6px 0 18px;
  font-size: 13px;
  color: var(--bw-text-soft);
}
.bw-crumb a { color: var(--bw-text-soft); text-decoration: none; }
.bw-crumb a:hover { color: var(--bw-c1); text-decoration: underline; }
.bw-crumb__sep { color: var(--bw-text-faint); }
.bw-crumb__current { color: var(--bw-text); font-weight: 500; }

/* Article body grid (with right TOC) */
.bw-article__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--bw-toc-w);
  gap: 40px;
  align-items: flex-start;
}
.bw-article--page .bw-article__body,
.bw-article--home { display: block; }

/* ===== Prose ===== */
.bw-prose {
  max-width: var(--bw-content-max);
  font-size: 16px;
  line-height: 1.78;
  color: var(--bw-text);
  word-wrap: break-word;
}
.bw-prose > * + * { margin-top: 1.1em; }
.bw-prose h1,
.bw-prose h2,
.bw-prose h3,
.bw-prose h4 {
  color: var(--bw-text);
  letter-spacing: -0.01em;
  scroll-margin-top: calc(var(--bw-header-h) + 14px);
}
.bw-prose h2 {
  position: relative;
  margin: 2em 0 0.8em;
  padding-top: 8px;
  font-size: 26px;
  font-weight: 700;
  border-top: 1px solid var(--bw-line-soft);
  line-height: 1.3;
}
.bw-prose h2:first-child { border-top: 0; padding-top: 0; margin-top: 0.4em; }
.bw-prose h3 { margin: 1.6em 0 0.6em; font-size: 20px; font-weight: 700; line-height: 1.35; }
.bw-prose h4 { margin: 1.4em 0 0.5em; font-size: 16.5px; font-weight: 700; }
.bw-prose p { margin: 0 0 1em; }
.bw-prose strong { color: var(--bw-text); font-weight: 700; }
.bw-prose em { color: var(--bw-text-2); }
.bw-prose a {
  color: var(--bw-link);
  text-decoration: none;
  border-bottom: 1px solid var(--bw-c-line);
  padding-bottom: 1px;
  transition: color var(--bw-trans), border-color var(--bw-trans);
}
.bw-prose a:hover { color: var(--bw-link-hover); border-bottom-color: var(--bw-c2); }

.bw-prose ul, .bw-prose ol {
  margin: 1em 0; padding: 0 0 0 1.4em;
}
.bw-prose ul li { list-style: disc; }
.bw-prose ol li { list-style: decimal; }
.bw-prose li { margin: 0.4em 0; }
.bw-prose li::marker { color: var(--bw-c1); }

.bw-prose blockquote {
  margin: 1.4em 0;
  padding: 12px 18px;
  background: var(--bw-bg-callout-tip);
  border-left: 4px solid var(--bw-c1);
  border-radius: var(--bw-radius-sm);
  color: var(--bw-text-mut);
}
.bw-prose blockquote p { margin: 0.4em 0; }

.bw-prose hr {
  border: 0; border-top: 1px solid var(--bw-line);
  margin: 2.4em 0;
}

/* Heading anchor links injected by addHeadingAnchors */
.bw-prose .heading-anchor {
  margin-left: 6px;
  font-weight: 400;
  color: var(--bw-text-faint);
  border-bottom: 0;
  opacity: 0;
  transition: opacity var(--bw-trans);
}
.bw-prose h2:hover .heading-anchor,
.bw-prose h3:hover .heading-anchor { opacity: 1; }

/* Inline code & code blocks */
.bw-prose :not(pre) > code {
  font-family: var(--bw-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: var(--bw-bg-code);
  border: 1px solid var(--bw-line-soft);
  border-radius: 4px;
  color: var(--bw-c2);
  word-break: break-all;
}
.bw-prose pre {
  position: relative;
  margin: 1.2em 0;
  padding: 18px 18px 16px;
  background: var(--bw-bg-codeblock);
  color: var(--bw-bg-codeblock-text);
  border-radius: var(--bw-radius-md);
  overflow-x: auto;
  line-height: 1.6;
  font-size: 14px;
  box-shadow: var(--bw-shadow-sm);
}
.bw-prose pre code {
  font-family: var(--bw-mono);
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  display: block;
}
.bw-copy {
  position: absolute; top: 10px; right: 10px;
  height: 26px; padding: 0 10px;
  font-size: 12px; font-weight: 600;
  font-family: var(--bw-mono);
  color: var(--bw-bg-codeblock-text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--bw-trans), border-color var(--bw-trans);
}
.bw-copy:hover { background: rgba(20, 184, 166, 0.18); border-color: var(--bw-c1); }

/* Tables */
.bw-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: 14.5px;
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  overflow: hidden;
  box-shadow: var(--bw-shadow-xs);
}
.bw-prose thead { background: var(--bw-bg-alt); }
.bw-prose th, .bw-prose td {
  padding: 11px 14px;
  text-align: left;
  border-bottom: 1px solid var(--bw-line-soft);
  vertical-align: top;
}
.bw-prose th {
  font-weight: 600;
  color: var(--bw-text);
  border-bottom: 1px solid var(--bw-line);
  white-space: nowrap;
}
.bw-prose tbody tr:last-child td { border-bottom: 0; }
.bw-prose tbody tr:hover { background: var(--bw-bg-alt); }

/* Callouts (Vue tip/warning style) */
.bw-prose .callout, .bw-prose .tip, .bw-prose .warning {
  margin: 1.4em 0;
  padding: 14px 16px;
  border-radius: var(--bw-radius);
  border-left: 4px solid var(--bw-c1);
  background: var(--bw-bg-callout-info);
}

/* ===== TOC (right rail) ===== */
.bw-toc {
  position: sticky;
  top: calc(var(--bw-header-h) + 24px);
  width: var(--bw-toc-w);
  max-height: calc(100vh - var(--bw-header-h) - 48px);
  overflow-y: auto;
  font-size: 13px;
  padding: 0 4px 0 12px;
  border-left: 1px solid var(--bw-line-soft);
}
.bw-toc__inner { padding: 4px 0 32px; }
.bw-toc__head {
  display: block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bw-text-soft);
  margin-bottom: 10px;
}
.bw-toc__list { list-style: none; margin: 0; padding: 0; }
.bw-toc__list li { list-style: none; margin: 0; }
.bw-toc__item a {
  display: block;
  padding: 5px 0 5px 8px;
  border-left: 2px solid transparent;
  color: var(--bw-text-mut);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--bw-trans), border-color var(--bw-trans);
}
.bw-toc__item a:hover { color: var(--bw-c1); }
.bw-toc__item a.is-active {
  color: var(--bw-c1);
  border-left-color: var(--bw-c1);
  font-weight: 600;
}
.bw-toc__item--lv2 a { padding-left: 8px; }
.bw-toc__item--lv3 a { padding-left: 22px; font-size: 12.5px; }
.bw-toc__more { margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--bw-line-soft); }
.bw-toc__list--plain li a { padding-left: 0; border-left: 0; }

/* ===== Hero (home) ===== */
.bw-article--home { padding: 0; max-width: none; }
.bw-hero {
  position: relative;
  text-align: center;
  padding: 64px 24px 48px;
  background: linear-gradient(180deg, rgba(20, 184, 166, 0.07) 0%, rgba(255, 255, 255, 0) 100%);
  border-bottom: 1px solid var(--bw-line);
  margin: -28px -28px 48px;
  overflow: hidden;
}
[data-theme="dark"] .bw-hero { background: linear-gradient(180deg, rgba(20, 184, 166, 0.10) 0%, rgba(11, 18, 32, 0) 100%); }
.bw-hero::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(circle at 50% 0%, rgba(20, 184, 166, 0.18) 0%, rgba(255, 255, 255, 0) 60%);
}
.bw-hero__inner { position: relative; max-width: 900px; margin: 0 auto; }
.bw-hero__kicker {
  display: inline-block;
  padding: 6px 14px;
  font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.10em;
  color: var(--bw-c1);
  background: var(--bw-c-tint);
  border: 1px solid var(--bw-c-line);
  border-radius: 999px;
}
.bw-hero__title {
  margin: 18px 0 12px;
  font-size: 56px;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--bw-text);
  background: linear-gradient(135deg, var(--bw-c2) 0%, var(--bw-c1) 50%, #2DD4BF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.bw-hero__lede {
  max-width: 640px;
  margin: 0 auto 28px;
  font-size: 17.5px;
  line-height: 1.6;
  color: var(--bw-text-mut);
}

.bw-hero__search {
  position: relative;
  max-width: 540px;
  margin: 0 auto 24px;
}
.bw-hero__search-icon {
  position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
  color: var(--bw-text-faint); pointer-events: none;
  display: inline-flex; align-items: center;
}
.bw-hero__search-input {
  width: 100%;
  height: 56px;
  padding: 0 130px 0 50px;
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius-md);
  background: var(--bw-bg);
  color: var(--bw-text);
  font-size: 16px;
  outline: none;
  box-shadow: var(--bw-shadow-sm);
  transition: border-color var(--bw-trans), box-shadow var(--bw-trans);
}
.bw-hero__search-input:focus {
  border-color: var(--bw-c1);
  box-shadow: var(--bw-shadow-brand);
}
.bw-hero__search-hint {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  font-size: 12px; font-family: var(--bw-mono);
  color: var(--bw-text-soft);
  padding: 4px 10px;
  background: var(--bw-bg-alt);
  border: 1px solid var(--bw-line);
  border-radius: 6px;
}
.bw-hero__cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 8px 0 18px; }

.bw-hero__pills { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 16px; }
.bw-hero__pill {
  display: inline-flex; align-items: center;
  height: 28px; padding: 0 14px;
  font-size: 13px; font-weight: 500;
  color: var(--bw-text-mut);
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: 999px;
  transition: color var(--bw-trans), border-color var(--bw-trans), background var(--bw-trans);
}
.bw-hero__pill:hover { color: var(--bw-c1); border-color: var(--bw-c1); background: var(--bw-c-tint); }

/* ===== Buttons ===== */
.bw-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 44px; padding: 0 22px;
  font-size: 14.5px; font-weight: 600;
  border-radius: var(--bw-radius);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--bw-trans), color var(--bw-trans), border-color var(--bw-trans), transform var(--bw-trans), box-shadow var(--bw-trans);
}
.bw-btn--primary {
  background: var(--bw-c1);
  color: var(--bw-text-on-brand);
  border-color: var(--bw-c1);
  box-shadow: var(--bw-shadow-sm);
}
.bw-btn--primary:hover {
  background: var(--bw-c2);
  border-color: var(--bw-c2);
  color: #fff;
  box-shadow: var(--bw-shadow-brand);
  transform: translateY(-1px);
}
.bw-btn--ghost {
  background: var(--bw-bg);
  color: var(--bw-text-mut);
  border-color: var(--bw-line);
}
.bw-btn--ghost:hover {
  border-color: var(--bw-c1);
  color: var(--bw-c1);
}

/* ===== Home sections ===== */
.bw-home-section {
  max-width: var(--bw-page-max);
  margin: 0 auto;
  padding: 56px 28px;
  border-bottom: 1px solid var(--bw-line-soft);
}
.bw-home-section:last-child { border-bottom: 0; }
.bw-home-section__head { max-width: 720px; margin: 0 auto 32px; text-align: center; }
.bw-h2 {
  margin: 0 0 8px;
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--bw-text);
  line-height: 1.2;
}
.bw-h2__lede {
  margin: 0;
  font-size: 16px;
  color: var(--bw-text-mut);
  line-height: 1.6;
}

/* ===== Card grid (Vue-style rounded cards w/ topbar accent) ===== */
.bw-cardgrid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.bw-cardgrid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 920px) {
  .bw-cardgrid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .bw-cardgrid--3 { grid-template-columns: 1fr; }
}
.bw-card {
  position: relative;
  display: flex; flex-direction: column;
  background: var(--bw-bg-card);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--bw-trans), border-color var(--bw-trans), box-shadow var(--bw-trans);
}
.bw-card:hover {
  transform: translateY(-2px);
  border-color: var(--bw-c1);
  box-shadow: var(--bw-shadow-md);
}
.bw-card__topbar {
  height: 4px;
  background: linear-gradient(90deg, var(--bw-c1), #2DD4BF);
  opacity: 0;
  transition: opacity var(--bw-trans);
}
.bw-card:hover .bw-card__topbar { opacity: 1; }
.bw-card__body { padding: 22px 22px 20px; flex: 1; }
.bw-card__title {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 17px; font-weight: 700;
  color: var(--bw-text);
  margin-bottom: 10px;
}
.bw-card__arrow {
  color: var(--bw-c1);
  display: inline-flex; align-items: center;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--bw-trans), transform var(--bw-trans);
}
.bw-card:hover .bw-card__arrow { opacity: 1; transform: translateX(0); }
.bw-card__desc {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--bw-text-mut);
}
.bw-card__list {
  list-style: none; margin: 0; padding: 0;
  border-top: 1px dashed var(--bw-line-soft);
  padding-top: 12px;
}
.bw-card__list li {
  display: flex; gap: 8px; align-items: flex-start;
  padding: 4px 0;
  font-size: 13px;
  color: var(--bw-text-soft);
  line-height: 1.4;
}
.bw-card__bullet { color: var(--bw-c1); font-weight: 700; flex-shrink: 0; }
.bw-card__litem { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bw-card__count {
  display: inline-flex; align-items: center;
  margin-top: 12px;
  font-size: 12px; font-weight: 600;
  color: var(--bw-c1);
  background: var(--bw-c-tint);
  padding: 3px 10px;
  border-radius: 999px;
}

/* Reflist (more categories, plain row list) */
.bw-reflist { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 720px) { .bw-reflist { grid-template-columns: 1fr; } }
.bw-reflist__item { list-style: none; }
.bw-reflist__link {
  display: flex; flex-direction: column; gap: 4px;
  padding: 14px 16px;
  background: var(--bw-bg-alt);
  border: 1px solid var(--bw-line-soft);
  border-radius: var(--bw-radius);
  text-decoration: none;
  transition: border-color var(--bw-trans), background var(--bw-trans);
}
.bw-reflist__link:hover { border-color: var(--bw-c1); background: var(--bw-bg); }
.bw-reflist__title { font-size: 14.5px; font-weight: 700; color: var(--bw-text); }
.bw-reflist__desc { font-size: 13px; color: var(--bw-text-mut); line-height: 1.5; }

/* ===== Post list ===== */
.bw-postlist { list-style: none; padding: 0; margin: 0; }
.bw-postlist__item {
  list-style: none;
  padding: 18px 4px;
  border-bottom: 1px solid var(--bw-line-soft);
}
.bw-postlist__item:last-child { border-bottom: 0; }
.bw-postlist__title {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--bw-text);
  text-decoration: none;
  margin-bottom: 6px;
  line-height: 1.4;
}
.bw-postlist__title:hover { color: var(--bw-c1); }
.bw-postlist__meta {
  display: flex; align-items: center; gap: 10px;
  font-size: 12.5px;
  color: var(--bw-text-soft);
  margin-bottom: 6px;
}
.bw-postlist__date { font-family: var(--bw-mono); font-size: 12px; }
.bw-postlist__chip {
  display: inline-flex;
  height: 20px; padding: 0 8px;
  align-items: center;
  font-size: 11.5px; font-weight: 500;
  color: var(--bw-c1);
  background: var(--bw-c-tint);
  border-radius: 999px;
}
.bw-postlist__desc { margin: 0; font-size: 14px; color: var(--bw-text-mut); line-height: 1.55; }

.bw-viewall {
  margin: 28px 0 0;
  text-align: center;
}
.bw-viewall a {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600;
  color: var(--bw-c1);
}

/* ===== Pager ===== */
.bw-pager {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  margin: 32px 0 8px;
  justify-content: center;
}
.bw-pager__btn,
.bw-pager__num {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 36px; height: 36px; padding: 0 12px;
  font-size: 13px; font-weight: 500;
  color: var(--bw-text-mut);
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: 8px;
  text-decoration: none;
  transition: border-color var(--bw-trans), color var(--bw-trans), background var(--bw-trans);
}
.bw-pager__btn:hover,
.bw-pager__num:hover { border-color: var(--bw-c1); color: var(--bw-c1); background: var(--bw-c-tint); }
.bw-pager__num.is-current {
  background: var(--bw-c1);
  border-color: var(--bw-c1);
  color: var(--bw-text-on-brand);
}
.bw-pager__btn.is-disabled,
.bw-pager__num.is-disabled {
  color: var(--bw-text-faint);
  background: var(--bw-bg-alt);
  pointer-events: none;
}

/* ===== Prev / Next ===== */
.bw-prevnext {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 56px 0 8px;
  padding-top: 32px;
  border-top: 1px solid var(--bw-line);
}
.bw-prevnext__item {
  display: flex; flex-direction: column;
  padding: 14px 18px;
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--bw-trans), background var(--bw-trans);
  min-width: 0;
}
.bw-prevnext__item:hover {
  border-color: var(--bw-c1);
  background: var(--bw-bg-alt);
}
.bw-prevnext__next { text-align: right; align-items: flex-end; }
.bw-prevnext__lab {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; font-weight: 600;
  color: var(--bw-text-soft);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.bw-prevnext__t {
  font-size: 14px;
  font-weight: 600;
  color: var(--bw-text);
  line-height: 1.4;
  word-break: break-word;
}
.bw-prevnext__item:hover .bw-prevnext__t { color: var(--bw-c1); }

/* ===== Footer ===== */
.bw-footer {
  margin-top: 80px;
  padding: 56px 28px 28px;
  background: var(--bw-bg-alt);
  border-top: 1px solid var(--bw-line);
  color: var(--bw-text-mut);
}
.bw-footer__inner {
  max-width: var(--bw-page-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr repeat(4, 1fr);
  gap: 32px;
}
.bw-footer__brand { padding-right: 16px; }
.bw-footer__logo { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--bw-text); }
.bw-footer__name { font-size: 18px; }
.bw-footer__tag {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--bw-text-mut);
  line-height: 1.6;
}
.bw-footer__cols { display: contents; }
.bw-footer__col ul { list-style: none; margin: 0; padding: 0; }
.bw-footer__col li { padding: 4px 0; }
.bw-footer__h {
  font-size: 13px;
  font-weight: 700;
  color: var(--bw-text);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.bw-footer__col a {
  font-size: 13.5px;
  color: var(--bw-text-mut);
  text-decoration: none;
}
.bw-footer__col a:hover { color: var(--bw-c1); }
.bw-footer__lang { display: flex; flex-wrap: wrap; gap: 8px; }
.bw-footer__lang li { padding: 0; }
.bw-footer__lang a {
  display: inline-flex; align-items: center;
  height: 24px; padding: 0 10px;
  font-size: 12px;
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: 999px;
}
.bw-footer__lang a:hover { border-color: var(--bw-c1); color: var(--bw-c1); }
.bw-footer__lang a.is-current { background: var(--bw-c-tint); border-color: var(--bw-c-line); color: var(--bw-c1); font-weight: 600; }

.bw-footer__bottom {
  max-width: var(--bw-page-max);
  margin: 32px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--bw-line);
  font-size: 12.5px;
  color: var(--bw-text-soft);
  display: flex; flex-direction: column; gap: 8px;
}
.bw-footer__rights { font-family: var(--bw-mono); }
.bw-footer__risk { line-height: 1.6; }

/* ===== FAQ accordion ===== */
.bw-faq {
  max-width: 820px;
  margin: 0 auto;
  display: flex; flex-direction: column; gap: 12px;
}
.bw-faq__item {
  background: var(--bw-bg);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  overflow: hidden;
  transition: border-color var(--bw-trans), box-shadow var(--bw-trans);
}
.bw-faq__item[open] {
  border-color: var(--bw-c1);
  box-shadow: var(--bw-shadow-sm);
}
.bw-faq__q {
  list-style: none;
  cursor: pointer;
  padding: 16px 22px;
  font-size: 15.5px; font-weight: 600;
  color: var(--bw-text);
  position: relative;
  padding-right: 48px;
  user-select: none;
}
.bw-faq__q::-webkit-details-marker { display: none; }
.bw-faq__q::after {
  content: '+';
  position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 400; line-height: 1;
  color: var(--bw-c1);
  transition: transform var(--bw-trans);
}
.bw-faq__item[open] .bw-faq__q::after { content: '−'; }
.bw-faq__a {
  padding: 0 22px 18px;
  color: var(--bw-text-mut);
  font-size: 14.5px;
  line-height: 1.7;
}
.bw-faq__a p { margin: 0; }

/* ===== CTA block ===== */
.bw-cta {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  padding: 36px;
  background: linear-gradient(135deg, var(--bw-c1) 0%, var(--bw-c2) 100%);
  border-radius: var(--bw-radius-lg);
  color: #fff;
  box-shadow: var(--bw-shadow-md);
}
.bw-cta .bw-h2 {
  color: #fff;
  margin-bottom: 8px;
  font-size: 24px;
}
.bw-cta__copy p {
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: 14.5px;
  line-height: 1.6;
  max-width: 540px;
}
.bw-cta__actions { display: flex; flex-wrap: wrap; gap: 10px; }
.bw-cta .bw-btn--primary {
  background: #fff;
  color: var(--bw-c2);
  border-color: #fff;
}
.bw-cta .bw-btn--primary:hover {
  background: var(--bw-bg-alt);
  color: var(--bw-c3);
}
.bw-cta .bw-btn--ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}
.bw-cta .bw-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
  color: #fff;
}

/* ===== 404 ===== */
.bw-404 {
  max-width: 600px;
  margin: 80px auto;
  padding: 0 28px;
  text-align: center;
}
.bw-404__code {
  font-size: 96px; font-weight: 800;
  line-height: 1;
  color: var(--bw-c1);
  letter-spacing: -0.04em;
  margin-bottom: 16px;
  font-family: var(--bw-mono);
}
.bw-404__title {
  margin: 0 0 12px;
  font-size: 28px;
  color: var(--bw-text);
}
.bw-404__body {
  margin: 0 0 24px;
  color: var(--bw-text-mut);
  font-size: 15px;
  line-height: 1.6;
}
.bw-404__actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ===== Misc utilities ===== */
.bw-mobile-only { display: none !important; }
.bw-desktop-only { display: inline-flex; }

/* ===== Responsive ===== */
@media (max-width: 1180px) {
  :root { --bw-toc-w: 200px; }
  .bw-article__body { gap: 28px; }
}

@media (max-width: 1024px) {
  .bw-shell--has-sidebar { grid-template-columns: 1fr; gap: 0; }
  .bw-sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    width: 84%; max-width: 320px;
    height: 100vh;
    background: var(--bw-bg);
    border-right: 1px solid var(--bw-line);
    box-shadow: var(--bw-shadow-lg);
    transform: translateX(-100%);
    transition: transform var(--bw-trans);
    z-index: 70;
    padding: 18px 12px 60px;
  }
  .bw-sidebar.is-open { transform: translateX(0); }
  .bw-sidebar__head { display: flex; }
  body.bw-nav-open { overflow: hidden; }
  body.bw-nav-open::after {
    content: '';
    position: fixed; inset: 0;
    background: var(--bw-bg-overlay);
    z-index: 65;
  }
  .bw-mobile-only { display: inline-flex !important; }
  .bw-article__body { grid-template-columns: 1fr; gap: 24px; }
  .bw-toc { display: none; }
  .bw-footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .bw-header__inner { padding: 0 16px; gap: 8px; }
  .bw-search { display: none; }
  .bw-topnav { display: none; }
  .bw-brand__tag { display: none; }
  .bw-shell { padding: 0 16px; }
  .bw-main { padding: 18px 0 60px; }
  .bw-hero { padding: 48px 18px 36px; margin: -18px -16px 36px; }
  .bw-hero__title { font-size: 38px; }
  .bw-hero__lede { font-size: 15.5px; }
  .bw-hero__search-input { height: 48px; font-size: 14.5px; padding: 0 100px 0 44px; }
  .bw-hero__search-hint { display: none; }
  .bw-home-section { padding: 36px 16px; }
  .bw-h2 { font-size: 24px; }
  .bw-article__h1 { font-size: 28px; }
  .bw-article__lede { font-size: 15.5px; }
  .bw-prose h2 { font-size: 22px; }
  .bw-prose h3 { font-size: 18px; }
  .bw-prose pre { padding: 14px 14px 12px; font-size: 13px; }
  .bw-prevnext { grid-template-columns: 1fr; }
  .bw-cta { padding: 24px; }
  .bw-cta .bw-h2 { font-size: 20px; }
  .bw-footer { padding: 42px 18px 24px; }
  .bw-footer__inner { grid-template-columns: 1fr; gap: 24px; }
  .bw-footer__brand { padding-right: 0; }
}

@media (max-width: 480px) {
  :root { --bw-header-h: 56px; }
  .bw-brand__name { font-size: 16px; }
  .bw-hero__title { font-size: 30px; letter-spacing: -0.015em; }
  .bw-hero__cta { flex-direction: column; }
  .bw-hero__cta .bw-btn { width: 100%; }
  .bw-cardgrid { gap: 14px; }
  .bw-card__body { padding: 18px; }
  .bw-postlist__title { font-size: 16px; }
  .bw-prose { font-size: 15.5px; }
}

/* ===== Print ===== */
@media print {
  .bw-header, .bw-sidebar, .bw-toc, .bw-prevnext, .bw-footer, .bw-iconbtn, .bw-pager, .bw-copy { display: none !important; }
  .bw-shell--has-sidebar { display: block; padding: 0; }
  .bw-main { padding: 0; }
  .bw-hero { background: none; }
  body.bw-body { background: #fff; color: #000; }
  .bw-prose pre { background: #f6f8fa; color: #000; border: 1px solid #ddd; }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ===== End ===== */