/* CGMStacking handbook stylesheet (skill: lang.css pasted unchanged at the top) */
/* handbook bilingual switch (skill 0.5.0).  Paste into the site's stylesheet unchanged.
   Without JavaScript nothing sets data-lang, so Chinese shows. */
html[data-lang="en"] .l-zh,
html:not([data-lang="en"]) .l-en { display: none !important; }

.lang-toggle {
  font: inherit; font-size: 0.9rem; padding: 0.3rem 0.8rem; min-height: 44px; min-width: 44px;
  border: 1px solid currentColor; border-radius: 999px; background: transparent; color: inherit; cursor: pointer;
}
.lang-toggle:focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }

:root {
  --bg: #ffffff; --fg: #1a1a1a; --muted: #5a6572; --line: #d8dee6;
  --card: #f6f8fa; --accent: #0072B2; --accent2: #D55E00; --ok: #009E73; --warn: #B34d00;
  --table-h: #eef2f6; --code-bg: #f2f4f7; --link: #0b5fa5;
}
html[data-theme="dark"] {
  --bg: #0f141a; --fg: #d8dee6; --muted: #8a95a1; --line: #2a3440;
  --card: #161d26; --accent: #5fb5f2; --accent2: #ff8a4d; --ok: #2fbf8f; --warn: #ffb066;
  --table-h: #1a232e; --code-bg: #131a23; --link: #6fc2f5;
}
* { box-sizing: border-box; }
html { font-size: 17px; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}
main.wrap { max-width: 980px; margin: 0 auto; padding: 1rem 16px 3rem; }
header.topbar {
  position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 0.5rem;
  padding: 0.45rem 16px; background: var(--bg); border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
header.topbar .brand { font-weight: 700; margin-right: 0.4rem; white-space: nowrap; }
header.topbar nav { display: flex; gap: 0.55rem; flex-wrap: wrap; font-size: 0.88rem; }
header.topbar nav a { color: var(--link); text-decoration: none; white-space: nowrap; }
header.topbar nav a:hover { text-decoration: underline; }
header.topbar .spacer { flex: 1; }
#themeBtn {
  font: inherit; font-size: 1rem; border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: inherit; cursor: pointer; min-height: 44px; min-width: 44px;
}
h1 { font-size: 1.55rem; line-height: 1.3; margin: 0.9rem 0 0.5rem; }
h2 { font-size: 1.2rem; margin: 1.1rem 0 0.4rem; border-bottom: 1px solid var(--line); padding-bottom: 0.2rem; }
h3 { font-size: 1.05rem; margin: 1.3rem 0 0.4rem; }
p { margin: 0.5rem 0; }
a { color: var(--link); }
.lead { font-size: 1rem; }
figure { margin: 0.5rem 0; }
figure svg { max-height: 150px; }
.anim { margin: 0.8rem 0; padding: 0.5rem; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
.anim svg { display: block; max-width: 100%; height: auto; margin: 0 auto; color: var(--fg); }
.anim-caption { font-size: 0.85rem; color: var(--muted); margin: 0.4rem 0 0; }
.anim-controls { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; margin-bottom: 0.4rem; font-size: 0.85rem; }
.anim-controls button { font: inherit; font-size: 0.85rem; padding: 0.3rem 0.8rem; min-height: 36px; border: 1px solid var(--line); border-radius: 999px; background: var(--bg); color: inherit; cursor: pointer; }
.anim-controls input[type=range] { flex: 1; min-width: 140px; }
figure img { max-width: 100%; height: auto; display: block; margin: 0 auto;
  border: 1px solid var(--line); border-radius: 6px; }
figcaption { font-size: 0.85rem; color: var(--muted); margin-top: 0.4rem; }
.src { font-size: 0.78rem; color: var(--muted); margin-top: 0.25rem; word-break: break-all; }
.note { background: var(--card); border-left: 3px solid var(--accent); padding: 0.5rem 0.8rem; border-radius: 0 6px 6px 0; }
.note.warn { border-left-color: var(--warn); }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: 8px;
  padding: 0.6rem 1rem; margin: 0.8rem 0; font-size: 0.9rem; }
.toc b { display: block; margin-bottom: 0.3rem; }
.toc ol { margin: 0; padding-left: 1.3rem; }
.toc li { margin: 0.15rem 0; }
.tblwrap { overflow-x: auto; margin: 0.5rem 0; }
table { border-collapse: collapse; font-size: 0.8rem; min-width: 100%; }
th, td { border: 1px solid var(--line); padding: 0.22rem 0.4rem; text-align: left; vertical-align: top; }
th { background: var(--table-h); }
tbody tr:nth-child(2n) { background: var(--card); }
code, kbd {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.85em;
  background: var(--code-bg); border-radius: 4px; padding: 0.08em 0.35em; word-break: break-all;
}
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 0.7rem 0.9rem; overflow-x: auto; font-size: 0.8rem; line-height: 1.5; }
pre code { background: transparent; padding: 0; word-break: normal; }
footer { margin-top: 2.5rem; border-top: 1px solid var(--line); padding-top: 0.7rem;
  font-size: 0.82rem; color: var(--muted); }
.kbd-hint { font-size: 0.8rem; color: var(--muted); }
.arrow-up::after { content: " ↑"; color: var(--ok); }
.arrow-flat::after { content: " →"; color: var(--muted); }
.arrow-down::after { content: " ↓"; color: var(--accent2); }
.pill {
  display: inline-block; font-size: 0.74rem; border-radius: 999px; padding: 0.05rem 0.55rem;
  border: 1px solid var(--line); white-space: nowrap;
}
.pill.prov { border-color: var(--warn); color: var(--warn); }
.pill.trusted { border-color: var(--ok); color: var(--ok); }
.pill.pending { border-color: var(--muted); color: var(--muted); }
.pill.rejected { border-color: var(--accent2); color: var(--accent2); }
@media (max-width: 640px) {
  html { font-size: 16px; }
  header.topbar nav { order: 3; width: 100%; font-size: 0.8rem; }
  h1 { font-size: 1.3rem; }
  .tblwrap table { font-size: 0.8rem; }
}
@media print {
  header.topbar { display: none; }
  .l-zh, .l-en { display: block !important; }
}