/* M31CGM handbook stylesheet (skill 0.8.0). Paste assets_ref/lang.css below unchanged. */

/* --- handbook bilingual switch (assets_ref/lang.css, unchanged) --- */
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; }

/* --- theme --- */
:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #555;
  --card: #f5f6f8;
  --border: #d9dce1;
  --link: #0b5cad;
  --accent: #b02a30;
  --ok: #1a7f37;
  --warn: #9a6700;
  --code-bg: #eef1f4;
}
html[data-theme="dark"] {
  --bg: #14161a;
  --fg: #e6e8eb;
  --muted: #a8b0ba;
  --card: #1d2026;
  --border: #3a3f47;
  --link: #7ab3f5;
  --accent: #ff7a80;
  --ok: #4ade80;
  --warn: #fbbf24;
  --code-bg: #23272e;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
}
main { max-width: 980px; margin: 0 auto; padding: 16px; }
header.site {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg); border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
}
header.site .brand { font-weight: 700; font-size: 1.05rem; }
header.site nav { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 0.92rem; }
header.site nav a { color: var(--link); text-decoration: none; }
header.site nav a:hover { text-decoration: underline; }
header.site .spacer { flex: 1; }

h1 { font-size: 1.6rem; margin: 0.6em 0 0.3em; }
h2 { font-size: 1.25rem; margin: 1.6em 0 0.4em; border-bottom: 1px solid var(--border); padding-bottom: 0.2em; }
h3 { font-size: 1.05rem; margin: 1.2em 0 0.3em; }
p { margin: 0.55em 0; }
a { color: var(--link); }
img { max-width: 100%; height: auto; }
figure { margin: 1em 0; }
figcaption { font-size: 0.85rem; color: var(--muted); margin-top: 0.3em; }
table { border-collapse: collapse; width: 100%; font-size: 0.88rem; margin: 0.8em 0; }
th, td { border: 1px solid var(--border); padding: 6px 8px; text-align: left; vertical-align: top; }
th { background: var(--card); }
@media (max-width: 700px) {
  pre code { white-space: pre-wrap; word-break: break-all; }
  main { overflow-x: hidden; }
  table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
  table thead, table tbody { display: table; width: max-content; }
  table tr { display: table-row; }
  table th, table td { display: table-cell; }
  header.site { max-width: 100vw; overflow-x: hidden; }
}
code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.86em; }
pre { background: var(--code-bg); padding: 10px 12px; border-radius: 8px; overflow-x: auto; }
svg { max-width: 100%; height: auto; }
.src { font-size: 0.78rem; color: var(--muted); }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 0.75rem; border: 1px solid var(--border); }
.tag.done { color: var(--ok); border-color: var(--ok); }
.tag.prov { color: var(--warn); border-color: var(--warn); }
.tag.run { color: var(--link); border-color: var(--link); }
.tag.plan { color: var(--muted); }
details.toc { border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; margin: 0.8em 0; background: var(--card); }
details.toc summary { cursor: pointer; font-weight: 600; }
details.toc ul { margin: 0.4em 0 0.2em; padding-left: 1.2em; }
details.toc li { margin: 0.15em 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 700px) { .grid2 { grid-template-columns: 1fr; } }
.warnbox { border-left: 3px solid var(--warn); background: var(--card); padding: 8px 12px; margin: 0.8em 0; }
.okbox { border-left: 3px solid var(--ok); background: var(--card); padding: 8px 12px; margin: 0.8em 0; }
.okbox h3, .warnbox h3 { margin-top: 0.2em; }
.small { font-size: 0.85rem; }
.muted { color: var(--muted); }