/* =========================================================
   kanqiu-shaba.com.cn  /assets/site.css
   共享外壳样式：重置 · 令牌 · 中文排版 · 命令栏 · 页脚 · 基础组件
   ========================================================= */

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:80px;
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
hr{border:0;border-top:1px solid var(--line-soft)}
table{border-collapse:collapse;width:100%}
summary{list-style:none}
summary::-webkit-details-marker{display:none}

/* ---------- 2. 设计令牌 ---------- */
:root{
  /* 深蓝同色阶 */
  --ink-900:#071633;
  --ink-800:#0D2A56;
  --ink-700:#16396F;
  --line:#24509B;
  --line-soft:rgba(36,80,155,.42);
  /* 强调与状态 */
  --accent:#E8542A;
  --accent-hi:#FF8A50;
  --state:#22D3D0;
  /* 阅读区与文字 */
  --paper:#F4F7FC;
  --text-dark:#0B1220;
  --muted:#A9BEDC;
  --text-body:#DBE6F7;
  --white:#FFFFFF;
  --scrim:rgba(7,22,51,.72);
  /* 形状 */
  --r-lg:28px;
  --r-md:12px;
  --r-pill:999px;
  /* 留白梯度 24 / 32 / 56 */
  --s-1:24px;
  --s-2:32px;
  --s-3:56px;
  --gap:clamp(14px,1.7vw,24px);
  --shell:1240px;
  --bar-h:56px;
  /* 字体族 */
  --font-display:"Noto Sans SC","HarmonyOS Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-head:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  /* 动效 */
  --ease:cubic-bezier(.2,.8,.2,1);
  --dur:240ms;
}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  min-height:100vh;
  overflow-x:hidden;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--text-body);
  text-align:left;
  word-break:break-word;
  overflow-wrap:anywhere;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 88% -10%,rgba(232,84,42,.16),transparent 62%),
    radial-gradient(900px 540px at -6% 2%,rgba(34,211,208,.08),transparent 58%),
    linear-gradient(rgba(36,80,155,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(36,80,155,.16) 1px,transparent 1px);
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  background-size:100% 100%,100% 100%,64px 64px,64px 64px;
}
::selection{background:rgba(232,84,42,.4);color:var(--white)}
h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  color:var(--white);
  letter-spacing:-.02em;
  line-height:1.25;
  text-wrap:balance;
}
h1{font-size:clamp(34px,5.4vw,56px);line-height:1.05;letter-spacing:-.03em}
h2{font-size:clamp(26px,3.4vw,40px);line-height:1.15}
h3{font-size:clamp(20px,2.2vw,28px);line-height:1.25}
h4{font-size:20px;font-weight:700;line-height:1.35;letter-spacing:-.01em}
p{text-wrap:pretty}
strong,b{font-weight:700;color:var(--white)}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:0;
}
:focus-visible{outline:2px solid var(--state);outline-offset:2px}

.skip-link{
  position:absolute;
  left:12px;
  top:-64px;
  z-index:120;
  padding:10px 18px;
  border-radius:0 0 var(--r-md) var(--r-md);
  background:var(--accent);
  color:var(--white);
  font-family:var(--font-head);
  font-size:14px;
  font-weight:700;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 4. 布局工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(14px,3vw,32px);
}
.band{position:relative;padding-block:var(--s-3)}
.band--tight{padding-block:var(--s-2)}
.band--panel{
  background:linear-gradient(180deg,rgba(13,42,86,.94),rgba(7,22,51,.55));
  border-block:1px solid var(--line-soft);
}
.band--paper{background:var(--paper);color:var(--text-dark)}
.band--paper h1,.band--paper h2,.band--paper h3,.band--paper h4,.band--paper strong{color:var(--text-dark)}
.band--paper .lede,.band--paper .muted,.band--paper .tile__text,.band--paper .tile__meta,.band--paper .prose{color:#4C5F7C}
.band--paper .eyebrow{color:#C0441F}
.band--paper .eyebrow::before{background:#C0441F}
.band--paper .tile{background:var(--white);border-color:rgba(36,80,155,.22)}
.band--paper .tile__title{color:var(--text-dark)}
.band--paper .chip{background:rgba(36,80,155,.08);color:#41577A}
.band--paper .data-row__key{color:#4C5F7C}
.band--paper .data-row__val{color:var(--text-dark)}

.section{padding-block:var(--s-2)}
.section-head{display:flex;flex-direction:column;gap:10px;margin-bottom:var(--s-2)}
.section-head--row{
  flex-direction:row;
  align-items:flex-end;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:var(--s-1);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent-hi);
}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--accent)}
.lede{font-size:17px;line-height:1.75;color:var(--muted);max-width:64ch}
.muted{color:var(--muted)}

.crumbs{font-size:13px;color:var(--muted)}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs__item{display:inline-flex;align-items:center;gap:8px}
.crumbs__item + .crumbs__item::before{content:"/";color:var(--line);font-family:var(--font-mono)}
.crumbs__link{color:var(--muted);transition:color var(--dur) var(--ease)}
.crumbs__link:hover{color:var(--white)}

/* ---------- 5. Bento 网格与模块 ---------- */
.bento{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
  align-items:stretch;
}
.bento > *{grid-column:span 12;min-width:0}
@media (min-width:760px){
  .bento > .b-3,.bento > .b-4{grid-column:span 6}
  .bento > .b-6,.bento > .b-8,.bento > .b-9{grid-column:span 12}
}
@media (min-width:1040px){
  .bento > .b-3{grid-column:span 3}
  .bento > .b-4{grid-column:span 4}
  .bento > .b-6{grid-column:span 6}
  .bento > .b-8{grid-column:span 8}
  .bento > .b-9{grid-column:span 9}
  .bento > .b-12{grid-column:span 12}
}

.tile{
  position:relative;
  padding:var(--s-2);
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  border-radius:var(--r-lg);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.tile:hover{transform:translateY(-2px);border-color:rgba(232,84,42,.78)}
.tile--card{background:var(--ink-700);border-radius:var(--r-md)}
.tile--flat{background:transparent}
.tile--focus{
  background:linear-gradient(150deg,var(--ink-700),var(--ink-800) 68%);
  border-radius:var(--r-lg) var(--r-md) var(--r-lg) var(--r-md);
}
.tile--notch{border-radius:var(--r-md) var(--r-lg) var(--r-md) var(--r-lg)}
.tile__title{font-size:20px;font-weight:700;line-height:1.35;color:var(--white);margin-bottom:8px}
.tile__text{font-size:15.5px;line-height:1.7;color:var(--muted)}
.tile__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin-top:var(--s-1);
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--muted);
}

.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

/* ---------- 6. 长文层叠结构 ---------- */
.doc{display:grid;gap:var(--s-2);align-items:start}
@media (min-width:1040px){
  .doc{grid-template-columns:minmax(190px,220px) minmax(0,1fr)}
  .doc__aside{position:sticky;top:calc(var(--bar-h) + var(--s-1))}
}
.prose{max-width:68ch;font-size:17px;line-height:1.75}
.prose > * + *{margin-top:1em}
.prose h2{font-size:clamp(22px,2.4vw,28px);margin-top:var(--s-2);margin-bottom:0}
.prose h3{font-size:20px;margin-top:var(--s-1);margin-bottom:0}
.prose ul,.prose ol{display:flex;flex-direction:column;gap:8px}
.prose ul li{position:relative;padding-left:18px}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:6px;
  height:6px;
  border-radius:2px;
  background:var(--accent);
}
.prose ol{counter-reset:prose}
.prose ol li{position:relative;padding-left:26px}
.prose ol li::before{
  counter-increment:prose;
  content:counter(prose);
  position:absolute;
  left:0;
  top:.24em;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--accent-hi);
}

/* ---------- 7. 目录 / 时间轴 / 问答 ---------- */
.toc{font-size:14px}
.toc__title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
  margin-bottom:14px;
}
.toc__list{border-left:1px solid var(--line-soft);display:flex;flex-direction:column;gap:2px}
.toc__link{
  display:block;
  padding:8px 0 8px 16px;
  margin-left:-1px;
  border-left:2px solid transparent;
  color:var(--muted);
  line-height:1.55;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.toc__link:hover{color:var(--white)}
.toc__link[aria-current="true"]{color:var(--white);border-left-color:var(--accent)}

.log{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:var(--s-1);
  padding-left:22px;
  border-left:1px solid var(--line-soft);
}
.log__item{position:relative}
.log__item::before{
  content:"";
  position:absolute;
  left:-28px;
  top:10px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--ink-900);
  border:2px solid var(--line);
}
.log__item--now::before{
  background:var(--accent);
  border-color:var(--accent);
  box-shadow:0 0 0 4px rgba(232,84,42,.18);
}
.log__meta{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--state)}
.log__title{font-size:18px;font-weight:700;color:var(--white);margin:4px 0 6px;line-height:1.35}
.log__text{font-size:15px;line-height:1.7;color:var(--muted)}

.qa{border-bottom:1px solid var(--line-soft)}
.qa:first-of-type{border-top:1px solid var(--line-soft)}
.qa__q{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 4px;
  font-family:var(--font-head);
  font-size:17px;
  font-weight:700;
  color:var(--white);
  cursor:pointer;
}
.qa__q::after{
  content:"";
  width:11px;
  height:11px;
  flex:0 0 auto;
  border-right:2px solid var(--accent);
  border-bottom:2px solid var(--accent);
  transform:rotate(45deg) translateY(-2px);
  transition:transform var(--dur) var(--ease);
}
.qa[open] .qa__q::after{transform:rotate(-135deg) translateY(-2px)}
.qa__a{padding:0 4px 20px;font-size:15.5px;line-height:1.75;color:var(--muted)}
.band--paper .qa{border-color:rgba(36,80,155,.22)}
.band--paper .qa__q{color:var(--text-dark)}
.band--paper .qa__a{color:#4C5F7C}

/* ---------- 8. 数据与标签 ---------- */
.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(24px,3vw,34px);
  font-weight:700;
  line-height:1.1;
  color:var(--white);
}
.stat__num em{font-style:normal;color:var(--accent-hi)}
.stat__label{font-size:13px;line-height:1.6;color:var(--muted)}

.data-list{
  border:1px solid var(--line-soft);
  border-radius:var(--r-md);
  overflow:hidden;
}
.data-row{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:12px;
  padding:12px 16px;
  border-bottom:1px solid rgba(36,80,155,.28);
  font-size:15px;
}
.data-row:last-child{border-bottom:0}
.data-row__key{font-size:14px;color:var(--muted)}
.data-row__val{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--white)}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  border:1px solid var(--line-soft);
  border-radius:var(--r-pill);
  background:rgba(22,57,111,.55);
  color:var(--muted);
  font-size:12.5px;
  line-height:1.5;
  letter-spacing:.02em;
  white-space:nowrap;
}
.chip--state{
  border-color:rgba(34,211,208,.45);
  background:rgba(34,211,208,.1);
  color:var(--state);
  font-family:var(--font-mono);
}
.chip--accent{
  border-color:rgba(232,84,42,.5);
  background:rgba(232,84,42,.12);
  color:var(--accent-hi);
}

.copy-btn{
  display:inline-flex;
  align-items:center;
  gap:5px;
  padding:3px 9px;
  border:1px solid var(--line-soft);
  border-radius:var(--r-pill);
  background:rgba(22,57,111,.5);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.04em;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.copy-btn:hover{color:var(--white);border-color:var(--accent)}
.copy-btn.is-copied{
  color:var(--state);
  border-color:rgba(34,211,208,.6);
  background:rgba(34,211,208,.12);
}

/* ---------- 9. 图片容器（页面阶段放图） ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  isolation:isolate;
  border:1px solid var(--line-soft);
  border-radius:var(--r-lg);
  background:linear-gradient(140deg,var(--ink-700),var(--ink-900));
  aspect-ratio:16/9;
}
.media--wide{aspect-ratio:21/9}
.media--4x3{aspect-ratio:4/3}
.media--3x2{aspect-ratio:3/2}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--auto{aspect-ratio:auto}
.media__img,.media > img{width:100%;height:100%;object-fit:cover}
.media--motion .media__img,.media--motion > img{filter:saturate(.92) contrast(1.06)}
.media__scrim{
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(7,22,51,.06),var(--scrim));
}
.media__scrim--diag{background:linear-gradient(125deg,rgba(7,22,51,.06) 28%,rgba(7,22,51,.84))}
.media__caption{
  position:absolute;
  left:18px;
  right:18px;
  bottom:16px;
  margin:0;
  font-size:13px;
  line-height:1.55;
  color:var(--white);
}
.media__tag{
  position:absolute;
  top:14px;
  left:14px;
  padding:4px 10px;
  border-radius:var(--r-pill);
  border:1px solid rgba(34,211,208,.45);
  background:rgba(7,22,51,.6);
  color:var(--state);
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.5;
}
.media--ph{
  border-style:dashed;
  border-color:rgba(36,80,155,.6);
  background-image:
    linear-gradient(135deg,rgba(36,80,155,.22) 0 1px,transparent 1px 14px),
    linear-gradient(140deg,var(--ink-700),var(--ink-900));
}
@media (prefers-reduced-motion:no-preference){
  .media--zoom .media__img,.media--zoom > img{transition:transform .5s var(--ease)}
  .media--zoom:hover .media__img,.media--zoom:hover > img{transform:scale(1.03)}
}

/* ---------- 10. 装饰与显现 ---------- */
.blob{
  position:absolute;
  border-radius:50%;
  filter:blur(48px);
  opacity:.5;
  pointer-events:none;
  z-index:0;
}
.blob--accent{background:radial-gradient(circle,rgba(232,84,42,.55),transparent 68%)}
.blob--state{background:radial-gradient(circle,rgba(34,211,208,.35),transparent 68%)}
.blob--deep{background:radial-gradient(circle,rgba(36,80,155,.62),transparent 70%)}

.reveal{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.reveal.is-in{opacity:1;transform:none}

/* ---------- 11. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  line-height:1.1;
  letter-spacing:.02em;
  text-align:center;
  transition:transform var(--dur) var(--ease),background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn--primary{
  background:linear-gradient(160deg,var(--accent),#CF431E);
  color:var(--white);
  box-shadow:0 14px 26px -18px rgba(232,84,42,1);
}
.btn--primary:hover{background:linear-gradient(160deg,var(--accent-hi),var(--accent));transform:translateY(-2px)}
.btn--ghost{
  background:rgba(13,42,86,.55);
  border-color:var(--line);
  color:var(--paper);
}
.btn--ghost:hover{border-color:var(--accent);color:var(--white);transform:translateY(-2px)}
.btn--quiet{background:transparent;border-color:transparent;color:var(--muted);padding:8px 10px}
.btn--quiet:hover{color:var(--white)}
.btn--sm{padding:8px 15px;font-size:13px}
.btn--block{width:100%}

/* ---------- 12. 命令栏头部 ---------- */
.cmd-bar{
  position:sticky;
  top:0;
  z-index:80;
  height:var(--bar-h);
  background:linear-gradient(180deg,rgba(9,26,58,.97),rgba(7,22,51,.92));
  border-bottom:1px solid var(--line-soft);
  -webkit-backdrop-filter:blur(12px) saturate(1.2);
  backdrop-filter:blur(12px) saturate(1.2);
}
.cmd-bar::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  opacity:.75;
  background:linear-gradient(90deg,transparent,rgba(232,84,42,.8),rgba(34,211,208,.5),transparent);
}
.cmd-bar__inner{
  height:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(14px,3vw,32px);
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  font-family:var(--font-head);
  font-weight:800;
  color:var(--white);
  letter-spacing:-.01em;
}
.brand__glyph{
  width:32px;
  height:32px;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  border-radius:10px;
  background:linear-gradient(145deg,var(--accent),#B93C1B);
  color:var(--white);
  font-size:16px;
  font-weight:900;
  box-shadow:0 6px 18px -10px rgba(232,84,42,.95);
}
.brand__name{font-size:16px;white-space:nowrap}
.brand__short{display:none;font-size:15px;white-space:nowrap}
.brand--foot .brand__glyph{width:36px;height:36px;font-size:17px}
.brand--foot .brand__name{font-size:17px}

.cmd-nav{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  align-items:center;
  justify-content:center;
}
.cmd-nav__list{display:flex;align-items:center;gap:2px}
.cmd-nav__item{display:block}
.cmd-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 11px;
  border-radius:9px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  line-height:1.3;
  color:var(--muted);
  white-space:nowrap;
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.cmd-nav__idx{
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:0;
  color:rgba(169,190,220,.6);
  transition:color var(--dur) var(--ease);
}
.cmd-nav__link:hover{color:var(--white);background:rgba(36,80,155,.32)}
.cmd-nav__link:hover .cmd-nav__idx{color:var(--accent-hi)}
.cmd-nav__link[aria-current="page"]{
  color:var(--white);
  background:linear-gradient(180deg,rgba(22,57,111,.95),rgba(13,42,86,.9));
  box-shadow:inset 0 -2px 0 0 var(--accent);
}
.cmd-nav__link[aria-current="page"] .cmd-nav__idx{color:var(--accent-hi)}
.cmd-nav__cta{display:none}

.cmd-bar__tail{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.cmd-bar__cta{white-space:nowrap}

.status-chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:5px 11px 5px 9px;
  border:1px solid rgba(34,211,208,.38);
  border-radius:var(--r-pill);
  background:rgba(34,211,208,.08);
  color:var(--state);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  white-space:nowrap;
}
.status-chip__dot{
  width:6px;
  height:6px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--state);
  animation:breathe 2.4s var(--ease) infinite;
}
.status-chip__text{white-space:nowrap}
@keyframes breathe{
  0%,100%{opacity:.55;box-shadow:0 0 0 0 rgba(34,211,208,.5)}
  50%{opacity:1;box-shadow:0 0 0 5px rgba(34,211,208,0)}
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 13px;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  background:rgba(13,42,86,.72);
  color:var(--white);
  font-family:var(--font-head);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--accent);background:rgba(22,57,111,.92)}
.nav-toggle__bars{position:relative;width:16px;height:10px;flex:0 0 auto}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),top var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

/* ---------- 13. 页脚 ---------- */
.site-foot{
  position:relative;
  margin-top:var(--s-3);
  background:linear-gradient(180deg,var(--ink-800),var(--ink-900) 78%);
  border-top:1px solid var(--line-soft);
  color:var(--text-body);
}
.site-foot::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  opacity:.65;
  background:linear-gradient(90deg,transparent,var(--accent),var(--state),transparent);
}
.site-foot__inner{
  display:grid;
  grid-template-columns:1fr;
  gap:var(--s-2);
  padding-block:var(--s-3);
}
.site-foot__brand .brand{margin-bottom:16px}
.site-foot__tagline{
  font-size:14.5px;
  line-height:1.75;
  color:var(--muted);
  max-width:36ch;
  margin-bottom:18px;
}
.foot-tags{display:flex;flex-wrap:wrap;gap:8px}

.foot-cols{
  display:grid;
  gap:var(--s-1);
  grid-template-columns:repeat(auto-fit,minmax(148px,1fr));
}
.foot-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-family:var(--font-head);
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--white);
}
.foot-col__title::before{content:"";width:14px;height:2px;border-radius:2px;background:var(--accent)}
.foot-list{display:flex;flex-direction:column;gap:9px}
.foot-link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:var(--muted);
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.foot-link:hover{
  color:var(--white);
  transform:translateX(3px);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-color:var(--accent);
}

.foot-contact__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--state);
}
.foot-contact__list{display:flex;flex-direction:column;gap:12px;margin-bottom:16px}
.contact-line{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.contact-line__label{
  flex:0 0 100%;
  font-size:11.5px;
  letter-spacing:.12em;
  color:rgba(169,190,220,.75);
}
.contact-line__value{font-size:14px;line-height:1.6;color:var(--white);word-break:break-all}
.contact-line__value.mono{font-size:13.5px}
.contact-line--wide .contact-line__value{font-size:13px;line-height:1.7;color:var(--text-body)}
.foot-contact__note{
  font-size:12.5px;
  line-height:1.75;
  color:var(--muted);
  max-width:44ch;
}

.site-foot__bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-block:18px;
  border-top:1px solid rgba(36,80,155,.4);
  font-size:12.5px;
  color:rgba(169,190,220,.88);
}
.foot-version{font-size:12.5px;letter-spacing:.02em;line-height:1.7}
.foot-copy{font-size:12.5px;line-height:1.7}

/* ---------- 14. 滚动进度与返回顶部（JS 注入） ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:90;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--accent),var(--accent-hi),var(--state));
  will-change:transform;
}
.back-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:85;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  background:rgba(13,42,86,.94);
  color:var(--white);
  font-family:var(--font-head);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) linear,border-color var(--dur) var(--ease);
}
.back-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{border-color:var(--accent)}
.back-top__icon{font-family:var(--font-mono);font-size:14px;line-height:1}
.back-top__text{line-height:1}

/* ---------- 15. 响应式：命令栏收敛 ---------- */
@media (max-width:1023px){
  .cmd-nav{
    position:fixed;
    top:var(--bar-h);
    left:0;
    right:0;
    z-index:79;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    max-height:calc(100vh - var(--bar-h));
    overflow-y:auto;
    padding:12px 14px 20px;
    background:linear-gradient(180deg,rgba(13,42,86,.99),rgba(7,22,51,.99));
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 50px -30px #000;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) linear;
  }
  .cmd-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
  }
  .cmd-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .cmd-nav__link{padding:13px 14px;font-size:15px;border-radius:10px;justify-content:flex-start}
  .cmd-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 0 var(--accent)}
  .cmd-nav__idx{font-size:12px}
  .cmd-nav__cta{display:inline-flex;margin-top:14px;align-self:flex-start}
  .nav-toggle{display:inline-flex}
}

@media (max-width:760px){
  .site-foot__inner{grid-template-columns:1fr}
  .foot-cols{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
}

@media (max-width:660px){
  .cmd-bar__cta{display:none}
  .status-chip{padding:4px 8px 4px 7px;font-size:11px;gap:6px}
  .cmd-bar__inner{gap:8px;padding-inline:12px}
  .back-top__text{display:none}
  .back-top{padding:11px 13px}
}

@media (max-width:560px){
  .brand__name{display:none}
  .brand__short{display:inline}
  .foot-contact__note{max-width:none}
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
  .scroll-progress__bar{transition:none}
  .tile:hover{transform:none}
  .btn:hover,.btn--ghost:hover{transform:none}
  .foot-link:hover{transform:none}
}