/* ==========================================================================
   百家家乐 · 共享样式 /assets/site.css
   骨架：吸顶双段命令栏 + 左右分屏（左索引 / 右内容）+ 深色页脚
   配色：夜航靛 · 靛蓝墨 · 朱红 · 铜鼓金 · 米白 · 素白 · 青绿
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#101C30;
  --ink-soft:#1E2E4A;
  --crimson:#C8342B;
  --gold:#C08A2E;
  --paper:#F7F2E8;
  --white:#FFFFFF;
  --jade:#1F7A6B;
  --slate:#5B6B82;
  --line:#D5DCE8;
  --sand:#E7DAC4;

  --on-dark:#F7F2E8;
  --on-dark-dim:#B6C2D3;
  --jade-soft:#7FC9BA;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --header-h:112px;
  --rail-w:300px;
  --frame:1400px;
  --pad-x:clamp(16px,3.2vw,44px);
  --radius:2px;
  --measure:64ch;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink-soft);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,pre{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{max-width:100%}
img{display:block;width:100%;height:auto}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}

:focus-visible{
  outline:2px solid var(--crimson);
  outline-offset:3px;
  border-radius:1px;
}

.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);
  white-space:nowrap;
}

/* ---------- 3. 排版 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(34px,5vw,64px);
  line-height:1.06;
  letter-spacing:-.02em;
  color:var(--ink-soft);
}
.display--hero{font-size:clamp(44px,6.5vw,104px)}
.display--sm{font-size:clamp(24px,2.6vw,34px)}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
  margin:0 0 10px;
}

.lede{
  font-size:19px;
  line-height:1.85;
  color:var(--slate);
  max-width:60ch;
}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}

.meta{
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.6;
  letter-spacing:.08em;
  color:var(--slate);
}

.prose{
  max-width:var(--measure);
  font-size:17px;
  line-height:1.9;
}
.prose > * + *{margin-top:1.2em}
.prose h2,.prose h3{
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.3;
  letter-spacing:-.01em;
  color:var(--ink-soft);
  margin-top:1.9em;
}
.prose h2{font-size:clamp(22px,2.4vw,30px)}
.prose h3{font-size:clamp(18px,1.8vw,22px)}
.prose ul,.prose ol{list-style:disc;padding-left:1.4em}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.5em}
.prose a{color:var(--crimson);text-decoration:none;border-bottom:1px solid currentColor}
.prose strong{font-weight:600;color:var(--ink)}
.prose code{
  font-family:var(--font-mono);
  font-size:.92em;
  background:var(--white);
  border:1px solid var(--line);
  padding:.1em .4em;
  border-radius:var(--radius);
}

/* ---------- 4. 工具与布局 ---------- */
.wrap{
  width:100%;
  max-width:var(--frame);
  margin:0 auto;
  padding-inline:var(--pad-x);
}

.site-main{display:block;min-height:60vh}

.page-layout{
  width:100%;
  max-width:var(--frame);
  margin:0 auto;
  padding:clamp(24px,4vw,60px) var(--pad-x) clamp(56px,7vw,112px);
  display:grid;
  grid-template-columns:minmax(0,var(--rail-w)) minmax(0,1fr);
  gap:clamp(24px,4vw,64px);
  align-items:start;
}

.section{padding-block:clamp(28px,4vw,64px)}
.section__head{margin-bottom:clamp(18px,2.4vw,32px)}
.section__head > * + *{margin-top:12px}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.stack > * + *{margin-top:clamp(14px,1.8vw,22px)}

.rule{
  height:1px;
  border:0;
  background:linear-gradient(90deg,var(--gold),rgba(192,138,46,0));
  opacity:.55;
}

.band--ink{
  background:var(--ink);
  color:var(--on-dark);
  padding-block:clamp(32px,4.6vw,72px);
}
.band--ink .display,
.band--ink .prose h2,
.band--ink .prose h3{color:var(--on-dark)}
.band--ink .lede,
.band--ink .meta{color:var(--on-dark-dim)}
.band--white{background:var(--white)}

/* ---------- 5. 按钮 / 标签 / 提示 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid transparent;
  border-radius:var(--radius);
  background:var(--crimson);
  color:var(--white);
  font-size:14px;
  line-height:1.4;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.btn:hover{background:#A8291F}
.btn:active{transform:translateY(1px)}

.btn--ghost{
  background:transparent;
  border-color:var(--ink-soft);
  color:var(--ink-soft);
}
.btn--ghost:hover{background:var(--ink-soft);color:var(--paper)}

.btn--on-dark{
  background:transparent;
  border-color:rgba(192,138,46,.7);
  color:var(--on-dark);
}
.btn--on-dark:hover{background:rgba(192,138,46,.16);border-color:var(--gold)}

.btn--anchor{
  background:var(--crimson);
  border-color:var(--crimson);
  color:var(--white);
}
.btn--anchor:hover{background:#A8291F;border-color:#A8291F}

.btn--small{padding:9px 14px;font-size:13px}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--white);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--slate);
  white-space:nowrap;
}
.tag--gold{border-color:rgba(192,138,46,.6);color:var(--gold)}
.tag--jade{border-color:rgba(31,122,107,.55);color:var(--jade)}
.tag--crimson{border-color:rgba(200,52,43,.5);color:var(--crimson)}

.notice{
  border:1px solid var(--line);
  border-left:3px solid var(--gold);
  background:var(--white);
  padding:14px 18px;
  font-size:15.5px;
  line-height:1.85;
}
.notice--jade{border-left-color:var(--jade)}
.notice--crimson{border-left-color:var(--crimson)}

.copy-btn{
  padding:2px 8px;
  border:1px solid rgba(192,138,46,.5);
  border-radius:var(--radius);
  background:transparent;
  color:var(--gold);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.copy-btn:hover{background:rgba(192,138,46,.16)}
.copy-btn[data-copied]{
  border-color:rgba(31,122,107,.7);
  color:var(--jade-soft);
  background:rgba(31,122,107,.18);
}

/* ---------- 6. 跳转链接与滚动进度 ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:120;
  padding:10px 16px;
  background:var(--crimson);
  color:var(--white);
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  border-radius:var(--radius);
  transform:translateY(-160%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 7. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--paper);
}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--crimson);
  transform:scaleX(0);
  transform-origin:left center;
  z-index:2;
}

.cmd-bar{position:relative}
.cmd-bar__inner{
  width:100%;
  max-width:var(--frame);
  margin:0 auto;
  padding-inline:var(--pad-x);
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
}

.cmd-bar--top{
  background:var(--ink);
  color:var(--on-dark);
}
.cmd-bar--top .cmd-bar__inner{min-height:62px}

.cmd-bar--main{
  background:var(--white);
  color:var(--ink-soft);
  border-bottom:1px solid var(--line);
}
.cmd-bar--main .cmd-bar__inner{min-height:50px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:6px 0;
  color:inherit;
  text-decoration:none;
}
.brand__mark{
  width:30px;
  height:30px;
  flex:none;
  display:grid;
  place-items:center;
  border:1px solid rgba(192,138,46,.65);
  border-radius:50%;
  color:var(--gold);
}
.brand__text{display:block;line-height:1.15}
.brand__name{
  display:block;
  font-family:var(--font-display);
  font-size:20px;
  font-weight:400;
  letter-spacing:.08em;
  color:var(--on-dark);
}
.brand__sub{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--on-dark-dim);
}

.status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--on-dark-dim);
  white-space:nowrap;
}
.status__dot{
  width:8px;
  height:8px;
  flex:none;
  border-radius:50%;
  background:var(--jade-soft);
  box-shadow:0 0 0 3px rgba(127,201,186,.18);
}

.cmd-search{
  flex:1 1 auto;
  min-width:0;
  max-width:420px;
  margin-left:auto;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:8px 14px;
  border:1px solid rgba(214,225,240,.22);
  border-radius:var(--radius);
  background:rgba(255,255,255,.05);
  color:var(--on-dark-dim);
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:border-color .18s ease,background-color .18s ease,color .18s ease;
}
.cmd-search:hover{
  border-color:rgba(192,138,46,.8);
  background:rgba(255,255,255,.1);
  color:var(--on-dark);
}
.cmd-search__icon{flex:none;color:var(--gold)}
.cmd-search__text{white-space:nowrap;color:var(--on-dark)}
.cmd-search__hint{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--on-dark-dim);
  white-space:nowrap;
}

.version-tags{
  display:flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
}
.version-tag{
  padding:4px 9px;
  border:1px solid rgba(192,138,46,.55);
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:11px;
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
  color:var(--gold);
  white-space:nowrap;
}
.version-tag--test{
  border-color:rgba(127,201,186,.6);
  color:var(--jade-soft);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--white);
  color:var(--ink-soft);
  font-size:13px;
  letter-spacing:.06em;
  cursor:pointer;
}
.nav-toggle__bars{
  position:relative;
  width:16px;
  height:2px;
  flex:none;
  background:var(--crimson);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:var(--crimson);
  transition:transform .2s ease;
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.site-header[data-open] .nav-toggle__bars{background:transparent}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

.primary-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
}
.primary-nav a{
  position:relative;
  display:inline-block;
  padding:14px 2px;
  color:var(--ink-soft);
  font-size:13.5px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:color .25s ease;
}
.primary-nav a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:9px;
  height:2px;
  background:var(--crimson);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.primary-nav a:hover{color:var(--ink)}
.primary-nav a:hover::after{transform:scaleX(1)}
.primary-nav a[aria-current="page"]{
  color:var(--crimson);
}
.primary-nav a[aria-current="page"]::after{transform:scaleX(1)}

.cmd-bar__aside{
  display:flex;
  align-items:center;
  gap:14px;
  margin-left:auto;
}
.lang-tag{
  padding-left:14px;
  border-left:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--slate);
  white-space:nowrap;
}

/* ---------- 8. 分屏骨架与左侧索引栏 ---------- */
.rail{position:sticky;top:calc(var(--header-h) + 20px)}

.rail__panel{
  background:var(--ink);
  color:var(--on-dark);
  border-top:3px solid var(--crimson);
  border-radius:var(--radius);
  padding:22px 20px 24px;
}
.rail__panel + .rail__panel{margin-top:16px}

.panel-title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
  margin:0 0 14px;
}

.chapter-index{counter-reset:ch}
.chapter-index li{counter-increment:ch}
.chapter-index a{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:9px 0 9px 11px;
  border-left:3px solid transparent;
  border-bottom:1px dashed rgba(247,242,232,.14);
  color:var(--on-dark-dim);
  font-size:13.5px;
  line-height:1.6;
  text-decoration:none;
  transition:color .25s ease,border-color .25s ease,background-color .25s ease;
}
.chapter-index a:hover{color:var(--on-dark);background:rgba(247,242,232,.06)}
.chapter-index a[aria-current="true"]{
  color:var(--white);
  border-left-color:var(--crimson);
  background:rgba(247,242,232,.07);
}
.chapter-index__num{
  flex:none;
  font-family:var(--font-mono);
  font-size:11px;
  font-variant-numeric:tabular-nums;
  letter-spacing:.08em;
  color:var(--gold);
}
.chapter-index__num::before{content:counter(ch,decimal-leading-zero)}

.rail__status{
  display:grid;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--on-dark-dim);
}
.rail__status b{
  font-weight:500;
  color:var(--on-dark);
}

/* ---------- 9. 面包屑 / 卡片 / 折叠 / 媒体 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--slate);
}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"／";color:var(--gold)}
.crumbs a{color:var(--slate);text-decoration:none}
.crumbs a:hover{color:var(--crimson)}
.crumbs [aria-current="page"]{color:var(--ink-soft)}

.card{
  position:relative;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.2vw,26px);
}
.card--lift{transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.card--lift:hover{
  transform:translateY(-2px);
  border-color:#C2CCDB;
  box-shadow:0 16px 30px -22px rgba(16,28,48,.55),0 2px 0 0 var(--sand);
}
.card__title{
  font-family:var(--font-display);
  font-weight:400;
  font-size:clamp(19px,2vw,24px);
  line-height:1.3;
  letter-spacing:-.01em;
  color:var(--ink-soft);
}
.card__meta{margin-top:10px}

.fold{
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.fold + .fold{margin-top:12px}
.fold__summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 20px;
  cursor:pointer;
  list-style:none;
  font-weight:500;
  font-size:16px;
  color:var(--ink-soft);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary:hover{color:var(--crimson)}
.fold__chev{
  flex:none;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--gold);
  transition:transform .3s ease;
}
.fold[open] .fold__chev{transform:rotate(90deg)}
.fold__body{
  padding:0 20px 20px;
  border-top:1px dashed var(--line);
  font-size:16px;
  line-height:1.9;
}
.fold[open] .fold__body{animation:foldIn .3s ease both}

@keyframes foldIn{
  from{opacity:0;transform:translateY(-4px)}
  to{opacity:1;transform:none}
}

.media{
  display:block;
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--sand);
}
.media img{
  width:100%;
  height:auto;
  aspect-ratio:16 / 10;
  object-fit:cover;
}
.media__ph{
  display:grid;
  place-items:center;
  width:100%;
  aspect-ratio:16 / 10;
  background-color:var(--sand);
  background-image:
    radial-gradient(120% 90% at 12% 8%,rgba(247,242,232,.9),rgba(247,242,232,0) 58%),
    radial-gradient(90% 70% at 88% 96%,rgba(16,28,48,.16),rgba(16,28,48,0) 55%),
    repeating-linear-gradient(115deg,rgba(16,28,48,.05) 0 2px,rgba(16,28,48,0) 2px 16px);
  color:var(--slate);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  text-align:center;
  padding:12px;
}
.media--wide .media img,
.media--wide .media__ph{aspect-ratio:21 / 9}
.media--tall .media img,
.media--tall .media__ph{aspect-ratio:3 / 4}
.media--square .media img,
.media--square .media__ph{aspect-ratio:1 / 1}
.media__cap{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--slate);
}

/* ---------- 10. 路线描边组件 ---------- */
.route{
  display:block;
  width:100%;
  height:auto;
  overflow:visible;
}
.route__track{
  fill:none;
  stroke:var(--crimson);
  stroke-width:2;
  stroke-linecap:round;
  stroke-dasharray:var(--route-len,1200);
  stroke-dashoffset:var(--route-len,1200);
  animation:routeDraw .6s ease forwards;
}
@keyframes routeDraw{
  to{stroke-dashoffset:0}
}

/* ---------- 11. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,2.4vw,32px);
  bottom:clamp(14px,2.4vw,32px);
  z-index:80;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--white);
  color:var(--ink-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  cursor:pointer;
  opacity:0;
  transform:translateY(10px);
  pointer-events:none;
  transition:opacity .25s ease,transform .25s ease,border-color .25s ease,color .25s ease;
}
.to-top[data-visible]{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{border-color:var(--crimson);color:var(--crimson)}
.to-top__arrow{color:var(--crimson);font-size:12px}

/* ---------- 12. 显现动画 ---------- */
@keyframes rise{
  from{opacity:0;transform:translateY(14px)}
  to{opacity:1;transform:none}
}
[data-reveal].is-in{animation:rise .55s cubic-bezier(.2,.7,.2,1) both}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  background:var(--ink);
  color:var(--on-dark);
  padding:clamp(38px,4.6vw,72px) var(--pad-x) 0;
}
.site-footer__inner{
  width:100%;
  max-width:var(--frame);
  margin:0 auto;
  display:grid;
  grid-template-columns:minmax(220px,300px) minmax(0,1fr);
  gap:clamp(28px,4vw,64px);
  padding-bottom:clamp(28px,3.6vw,48px);
}
.brand--footer .brand__name{color:var(--on-dark)}
.site-footer__line{
  margin-top:18px;
  font-family:var(--font-display);
  font-size:19px;
  line-height:1.7;
  letter-spacing:.02em;
  color:var(--on-dark);
  max-width:22ch;
}
.site-footer__brand .btn{margin-top:22px}

.foot-nav{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(20px,2.6vw,40px);
}
.foot-col__title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
  margin:0 0 14px;
}
.foot-col__list{
  display:grid;
  gap:9px;
  font-size:14px;
  line-height:1.7;
  color:var(--on-dark-dim);
}
.foot-col__list a{
  color:var(--on-dark-dim);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.foot-col__list a:hover{
  color:var(--on-dark);
  border-bottom-color:var(--gold);
}
.foot-col__list--contact li{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px;
}
.foot-col__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--gold);
}
.foot-col__mono{
  font-family:var(--font-mono);
  font-size:13px;
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
  color:var(--on-dark);
  word-break:break-all;
}
.foot-col__text{font-size:14px;line-height:1.75;color:var(--on-dark-dim)}

.version-strip{
  border-top:1px solid rgba(192,138,46,.35);
  border-bottom:1px solid rgba(247,242,232,.14);
  background:rgba(255,255,255,.03);
}
.version-strip__inner{
  width:100%;
  max-width:var(--frame);
  margin:0 auto;
  padding:16px var(--pad-x);
  display:flex;
  flex-wrap:wrap;
  gap:12px clamp(20px,4vw,56px);
  align-items:baseline;
}
.version-cell{
  display:inline-flex;
  align-items:baseline;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
}
.version-cell__k{color:var(--gold)}
.version-cell__v{
  color:var(--on-dark);
  font-variant-numeric:tabular-nums;
}
.version-cell--test .version-cell__v{
  color:var(--jade-soft);
  padding:2px 8px;
  border:1px solid rgba(127,201,186,.5);
  border-radius:var(--radius);
}

.site-footer__base{
  width:100%;
  max-width:var(--frame);
  margin:0 auto;
  padding:18px 0 26px;
}
.site-footer__base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 24px;
}
.site-footer__note,
.site-footer__legal{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--on-dark-dim);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1180px){
  .foot-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:1080px){
  .brand__sub{display:none}
  .cmd-search{max-width:260px}
  .cmd-search__hint{display:none}
  .site-footer__inner{grid-template-columns:1fr}
}

@media (max-width:960px){
  :root{--header-h:104px}

  .nav-toggle{display:inline-flex;order:1}
  .cmd-bar--main .cmd-bar__inner{
    flex-wrap:wrap;
    padding-block:6px;
    row-gap:0;
  }
  .cmd-bar__aside{order:2;gap:10px}
  .primary-nav{
    order:3;
    flex-basis:100%;
    display:none;
    margin-top:6px;
    border-top:1px solid var(--line);
    padding-top:2px;
  }
  .site-header[data-open] .primary-nav{display:block}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .primary-nav a{
    display:block;
    padding:13px 0;
    font-size:15px;
    border-bottom:1px dashed var(--line);
  }
  .primary-nav a::after{display:none}
  .primary-nav a[aria-current="page"]{
    color:var(--crimson);
    padding-left:12px;
    box-shadow:inset 3px 0 0 var(--crimson);
  }

  .page-layout{grid-template-columns:1fr}
  .rail{position:static;order:-1}
  .chapter-index{
    display:flex;
    gap:8px;
    overflow-x:auto;
    padding-bottom:6px;
  }
  .chapter-index li{flex:0 0 auto}
  .chapter-index a{
    border:1px solid rgba(247,242,232,.18);
    border-left:1px solid rgba(247,242,232,.18);
    border-radius:var(--radius);
    padding:8px 12px;
    white-space:nowrap;
  }
  .chapter-index a[aria-current="true"]{
    border-color:var(--crimson);
    background:rgba(200,52,43,.16);
  }
}

@media (max-width:720px){
  .status__text{display:none}
  .cmd-search{
    max-width:52px;
    justify-content:center;
    padding:9px;
  }
  .cmd-search__text{display:none}
  .version-tag--test{display:none}
  .lang-tag{display:none}
  .btn{padding:11px 16px;font-size:13.5px}
  .site-footer__line{font-size:17px}
}

@media (max-width:560px){
  .version-tag{display:none}
  .foot-nav{grid-template-columns:1fr}
  .site-footer{padding-bottom:56px}
  .rail__panel{padding:18px 16px 20px}
  .section{padding-block:clamp(22px,5vw,40px)}
}

/* ---------- 15. 动效与可读性偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .route__track{stroke-dashoffset:0;animation:none}
  [data-reveal].is-in{animation:none}
  .card--lift:hover{transform:none}
}