/* =========================================================
   博狗网登录 · 共享站点样式 /assets/site.css
   档案墨绿 + 琥珀金刻度 + 纸米白卡片
   ========================================================= */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:150px}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
::-moz-focus-inner{border:0}

/* ---------- tokens ---------- */
:root{
  --ink:#0C2A24;
  --ink-deep:#08201B;
  --ink-soft:#123B32;
  --amber:#F0A93B;
  --amber-soft:#FFD28A;
  --cool:#6E93B0;
  --cool-soft:#BBD2E2;
  --paper:#F5EFE2;
  --paper-soft:#E6DECD;
  --char:#14201D;
  --moss:#4E7A63;
  --muted:#8C9A92;
  --text:#CBD8D0;
  --line:rgba(245,239,226,.14);
  --line-amber:rgba(240,169,59,.28);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,"Courier New",monospace;
  --maxw:1240px;
  --gutter:clamp(16px,4.2vw,52px);
  --gap:clamp(16px,2.6vw,32px);
  --ease:cubic-bezier(.22,.7,.3,1);
  --shadow-paper:0 2px 0 rgba(0,0,0,.16),10px 12px 0 rgba(240,169,59,.13);
}

/* ---------- base ---------- */
body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16.5px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{color:var(--paper);line-height:1.25;font-weight:800;letter-spacing:-.01em}
::selection{background:var(--amber);color:#1A1206}

:focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
  border-radius:2px;
}
a:focus-visible,button:focus-visible{outline:2px solid var(--amber);outline-offset:3px}

.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  padding:.72em 1.15em;
  background:var(--amber);
  color:#1A1206;
  font-weight:800;
  font-size:.86rem;
  letter-spacing:.04em;
  border-radius:2px;
  box-shadow:0 6px 18px rgba(0,0,0,.4);
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

/* =========================================================
   HEADER
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--ink);
  border-bottom:1px solid var(--line-amber);
}

/* --- 上层说明带 --- */
.header-masthead{
  background:var(--ink-deep);
  border-bottom:1px solid rgba(240,169,59,.16);
}
.header-masthead__inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,24px);
  min-height:38px;
  padding-block:5px;
  font-size:.74rem;
  letter-spacing:.06em;
  color:var(--muted);
}
.brand-line{
  display:flex;
  align-items:center;
  gap:.6em;
  flex:0 1 auto;
  min-width:0;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  color:#A8B7AE;
}
.brand-line__dot{
  flex:none;
  width:6px;
  height:6px;
  background:var(--amber);
  box-shadow:0 0 0 3px rgba(240,169,59,.16);
}

.version-ticker{
  flex:1 1 auto;
  min-width:0;
  overflow:hidden;
  position:relative;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 10%,#000 90%,transparent);
}
.version-ticker__track{
  display:flex;
  width:max-content;
  animation:ticker-scroll 34s linear infinite;
}
.version-ticker:hover .version-ticker__track{animation-play-state:paused}
.version-ticker__seq{display:flex;flex:none}
.version-ticker__item{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:#93A79C;
  padding-inline:.9em;
  border-right:1px solid rgba(240,169,59,.24);
  white-space:nowrap;
}
.version-ticker__item:first-child{color:var(--amber-soft)}
@keyframes ticker-scroll{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}

.version-chip{
  flex:none;
  display:inline-flex;
  align-items:center;
  gap:.42em;
  padding:.3em .62em;
  border:1px solid rgba(240,169,59,.5);
  background:rgba(240,169,59,.09);
  color:var(--amber);
  font-family:var(--mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.09em;
  white-space:nowrap;
}
.version-chip__label{color:#B99B69;font-weight:400}
.version-chip__dot{color:rgba(240,169,59,.55)}

.quick-link{
  flex:none;
  display:inline-flex;
  align-items:center;
  gap:.38em;
  color:var(--amber-soft);
  font-size:.76rem;
  font-weight:800;
  letter-spacing:.09em;
  border-bottom:1px solid transparent;
  padding-block:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.quick-link:hover{border-bottom-color:var(--amber);color:var(--amber)}
.quick-link__arrow{transition:transform .2s var(--ease)}
.quick-link:hover .quick-link__arrow{transform:translateX(3px)}

/* --- 下层导航带 --- */
.header-nav-band{position:relative;background:var(--ink)}
.header-nav-band::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:7px;
  background-image:repeating-linear-gradient(90deg,rgba(240,169,59,.42) 0 1px,transparent 1px 22px);
  opacity:.55;
  pointer-events:none;
}
.header-nav-band__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.6vw,38px);
  min-height:66px;
  padding-block:10px 20px;
}

.brandmark{display:flex;align-items:center;gap:.7rem;flex:none}
.brandmark__mark{
  width:40px;
  height:40px;
  display:grid;
  place-items:center;
  background:var(--amber);
  color:#1A1206;
  font-size:1.05rem;
  font-weight:900;
  line-height:1;
  box-shadow:4px 4px 0 rgba(240,169,59,.2),inset 0 0 0 1px rgba(0,0,0,.16);
  transition:box-shadow .22s var(--ease),transform .22s var(--ease);
}
.brandmark:hover .brandmark__mark{transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(240,169,59,.24),inset 0 0 0 1px rgba(0,0,0,.16)}
.brandmark__text{display:flex;flex-direction:column;line-height:1.25}
.brandmark__name{font-size:1.02rem;font-weight:800;color:var(--paper);letter-spacing:.03em}
.brandmark__sub{font-family:var(--mono);font-size:.64rem;letter-spacing:.2em;color:var(--muted)}

/* --- 导航 --- */
.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(0px,.5vw,8px)}
.nav-list__item{display:flex;align-items:center}
.nav-link{
  position:relative;
  display:inline-block;
  padding:.55em .68em;
  font-size:.85rem;
  font-weight:700;
  letter-spacing:.045em;
  color:#C3D2C9;
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(245,239,226,.06)}
.nav-link[aria-current="page"]{color:var(--amber);border-bottom-color:var(--amber)}
.nav-link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:50%;
  top:-5px;
  width:1px;
  height:6px;
  background:var(--amber);
  transform:translateX(-50%);
}

/* --- 抽屉按钮 / 遮罩（桌面隐藏） --- */
.nav-toggle{display:none}
.nav-scrim{display:none}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{
  position:relative;
  background:var(--ink-deep);
  color:var(--text);
  border-top:1px solid var(--line-amber);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:8px;
  background-image:repeating-linear-gradient(90deg,rgba(240,169,59,.5) 0 1px,transparent 1px 20px);
  opacity:.5;
  pointer-events:none;
}
.footer-main{padding-block:clamp(44px,6vw,84px) clamp(24px,3vw,40px)}

.footer-head{
  display:grid;
  grid-template-columns:minmax(230px,.9fr) minmax(0,1.7fr);
  gap:clamp(26px,4vw,60px);
  padding-bottom:clamp(26px,4vw,44px);
  border-bottom:1px solid var(--line);
}
.footer-head__brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-head__mark{
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  background:transparent;
  border:1px solid var(--line-amber);
  color:var(--amber);
  font-size:1.15rem;
  font-weight:900;
  line-height:1;
  transform:rotate(-3deg);
}
.footer-head__name{font-size:1.32rem;font-weight:900;color:var(--paper);letter-spacing:.03em}
.footer-head__line{
  font-size:.92rem;
  color:var(--amber-soft);
  letter-spacing:.05em;
  max-width:16em;
}
.footer-version{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--muted);
  border:1px solid var(--line);
  padding:.32em .6em;
}
.footer-version__key{color:var(--amber);letter-spacing:.16em}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,36px);
  align-content:start;
}
.footer-col__title{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.18em;
  color:var(--amber);
  padding-bottom:.7em;
  margin-bottom:.7em;
  border-bottom:1px solid var(--line);
}
.footer-col__list{display:flex;flex-direction:column;gap:.62em}
.footer-link{
  display:inline-block;
  font-size:.88rem;
  color:#B7C6BD;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{color:var(--amber-soft);border-bottom-color:var(--line-amber)}

.footer-contact{
  margin-top:clamp(26px,4vw,44px);
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,30px);
  padding:clamp(20px,3vw,32px);
  background:var(--paper);
  color:var(--char);
  border:1px solid rgba(20,32,29,.14);
  box-shadow:8px 8px 0 rgba(240,169,59,.16);
}
.footer-contact__label{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.18em;
  color:#6B7A70;
  margin-bottom:.35em;
}
.footer-contact__value{
  font-size:.92rem;
  font-weight:700;
  line-height:1.6;
  color:var(--char);
  overflow-wrap:anywhere;
}
.footer-contact__note{
  grid-column:1 / -1;
  font-size:.78rem;
  line-height:1.8;
  color:#5C6B62;
  padding-top:.9em;
  border-top:1px dashed rgba(20,32,29,.2);
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:.5em 1.6em;
  justify-content:space-between;
  align-items:center;
  margin-top:clamp(22px,3vw,34px);
  padding-top:16px;
  border-top:1px solid var(--line);
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.05em;
  color:var(--muted);
}

/* =========================================================
   通用组件
   ========================================================= */

/* --- 按钮 --- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  padding:.82em 1.4em;
  font-size:.9rem;
  font-weight:800;
  letter-spacing:.05em;
  line-height:1.3;
  border:1px solid transparent;
  border-radius:2px;
  transition:transform .18s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn__arrow{transition:transform .2s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(4px)}
.btn--primary{background:var(--amber);color:#1A1206;box-shadow:4px 4px 0 rgba(240,169,59,.22)}
.btn--primary:hover{background:var(--amber-soft);transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(240,169,59,.28)}
.btn--ghost{border-color:rgba(245,239,226,.3);color:var(--paper)}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn--cool{border-color:rgba(110,147,176,.7);color:var(--cool-soft);background:rgba(110,147,176,.1)}
.btn--cool:hover{background:rgba(110,147,176,.22);border-color:var(--cool-soft);color:#DCEBF5}

/* --- 标签 --- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:.24em .6em;
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.14em;
  border:1px solid var(--line);
  color:var(--muted);
  white-space:nowrap;
}
.tag--amber{border-color:var(--line-amber);color:var(--amber);background:rgba(240,169,59,.1)}
.tag--cool{border-color:rgba(110,147,176,.5);color:var(--cool-soft);background:rgba(110,147,176,.12)}

/* --- 眉标 --- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.65em;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.2em;
  color:var(--amber);
}
.eyebrow::before{content:"";width:14px;height:1px;background:currentColor;flex:none}

/* --- 纸卡 --- */
.paper-card{
  position:relative;
  background:var(--paper);
  color:var(--char);
  border:1px solid rgba(20,32,29,.14);
  padding:clamp(18px,2.6vw,30px);
  border-radius:2px;
  box-shadow:var(--shadow-paper);
}
.paper-card h2,.paper-card h3,.paper-card h4{color:var(--char)}
.paper-card--stack::after{
  content:"";
  position:absolute;
  inset:10px -10px -10px 10px;
  background:var(--paper-soft);
  border:1px solid rgba(20,32,29,.1);
  z-index:-1;
}

/* --- 图片容器基础（页面阶段放置占位或图片） --- */
.figure{position:relative;margin:0}
.figure__frame{
  position:relative;
  display:grid;
  place-items:center;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:var(--ink-soft);
  border:1px solid var(--line-amber);
}
.figure__img{width:100%;height:100%;object-fit:cover;display:block}
.figure__placeholder{
  width:100%;
  height:100%;
  display:grid;
  place-items:center;
  gap:.5em;
  background-image:
    repeating-linear-gradient(135deg,rgba(240,169,59,.14) 0 1px,transparent 1px 14px),
    repeating-linear-gradient(45deg,rgba(110,147,176,.1) 0 1px,transparent 1px 26px);
  background-color:var(--ink-soft);
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.18em;
  color:#9FB3A8;
  padding:1em;
  text-align:center;
}
.figure__caption{
  margin-top:.7em;
  font-size:.78rem;
  letter-spacing:.04em;
  color:var(--muted);
}
.figure--wide .figure__frame{aspect-ratio:21 / 9}
.figure--tall .figure__frame{aspect-ratio:4 / 5}
.figure--square .figure__frame{aspect-ratio:1 / 1}

/* --- 网格 --- */
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}

/* --- 章节 --- */
.section{position:relative;padding-block:clamp(48px,7vw,96px)}
.section--tint{background:var(--ink-soft)}
.section--paper{background:var(--paper);color:#3E4A44}
.section--paper .section__title{color:var(--char)}
.section--paper .section__note{color:#5C6B62}
.section--paper .section__num{border-color:rgba(20,32,29,.2);color:#8A6A1F}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  gap:clamp(10px,2vw,22px);
  margin-bottom:clamp(24px,3.4vw,44px);
}
.section__num{
  font-family:var(--mono);
  font-size:.78rem;
  letter-spacing:.16em;
  color:var(--amber);
  border:1px solid var(--line-amber);
  padding:.35em .62em;
  line-height:1;
}
.section__title{
  font-size:clamp(1.7rem,3.4vw,2.5rem);
  font-weight:900;
  line-height:1.18;
  letter-spacing:-.01em;
  color:var(--paper);
}
.section__note{
  font-size:.82rem;
  letter-spacing:.04em;
  color:var(--muted);
  max-width:26em;
  line-height:1.75;
}

/* --- 刻度装饰条 --- */
.tick-rail{
  position:absolute;
  top:0;
  bottom:0;
  left:0;
  width:56px;
  background-image:repeating-linear-gradient(180deg,var(--line-amber) 0 1px,transparent 1px 14px);
  opacity:.55;
  pointer-events:none;
}

/* --- 面包屑 --- */
.breadcrumb{
  padding-block:14px;
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5em}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.5em}
.breadcrumb__item::after{content:"/";color:rgba(240,169,59,.55)}
.breadcrumb__item:last-child::after{content:none}
.breadcrumb__item a{transition:color .2s var(--ease)}
.breadcrumb__item a:hover{color:var(--amber)}
.breadcrumb__item[aria-current="page"]{color:var(--amber-soft)}

/* --- 正文 --- */
.prose{
  max-width:34em;
  font-size:1rem;
  line-height:1.85;
  color:var(--text);
}
.prose > * + *{margin-top:1em}
.prose h2{font-size:1.32rem;font-weight:800;color:var(--paper)}
.prose h3{font-size:1.08rem;font-weight:800;color:var(--paper)}
.prose strong{color:var(--amber-soft);font-weight:800}
.prose ul,.prose ol{display:flex;flex-direction:column;gap:.4em}
.prose li{position:relative;padding-left:1.1em}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.92em;
  width:.42em;
  height:1px;
  background:var(--amber);
}
.section--paper .prose{color:#3E4A44}
.section--paper .prose h2,.section--paper .prose h3,.section--paper .prose strong{color:var(--char)}

/* --- 滚动显现 --- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
[data-reveal].is-revealed{opacity:1;transform:none;will-change:auto}

/* --- JS 注入：滚动进度与返回顶部 --- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:200;
  width:100%;
  height:2px;
  transform:scaleX(var(--p,0));
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--amber),var(--amber-soft));
  pointer-events:none;
}
.to-top{
  position:fixed;
  right:clamp(12px,2.4vw,28px);
  bottom:clamp(12px,2.4vw,28px);
  z-index:80;
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  background:var(--ink-soft);
  border:1px solid var(--line-amber);
  color:var(--amber);
  font-size:1.05rem;
  line-height:1;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s,background .2s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--ink);border-color:var(--amber)}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1120px){
  .nav-link{padding:.55em .5em;font-size:.82rem}
  .brandmark__sub{letter-spacing:.14em}
}

@media (max-width:1000px){
  html{scroll-padding-top:120px}

  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:.5em;
    margin-left:auto;
    padding:.52em .72em;
    position:relative;
    z-index:130;
    border:1px solid var(--line-amber);
    background:rgba(240,169,59,.07);
    color:var(--amber);
    font-size:.76rem;
    font-weight:800;
    letter-spacing:.12em;
    line-height:1;
    transition:background .2s var(--ease),border-color .2s var(--ease);
  }
  .nav-toggle:hover{background:rgba(240,169,59,.16);border-color:var(--amber)}
  .nav-toggle__bars{display:block;width:18px}
  .nav-toggle__bars span{
    display:block;
    height:1.5px;
    background:currentColor;
    margin:3.5px 0;
    transition:transform .25s var(--ease),opacity .18s var(--ease);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

  .primary-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    width:min(88vw,368px);
    margin:0;
    padding:96px clamp(18px,4vw,30px) 40px;
    background:var(--ink-soft);
    border-left:1px solid var(--line-amber);
    box-shadow:-24px 0 48px rgba(0,0,0,.45);
    transform:translateX(102%);
    transition:transform .34s var(--ease);
    overflow-y:auto;
    z-index:120;
  }
  .primary-nav[data-open="true"]{transform:translateX(0)}

  .nav-list{flex-direction:column;align-items:stretch;gap:0;counter-reset:navitem}
  .nav-list__item{
    display:flex;
    align-items:center;
    gap:.9em;
    border-bottom:1px solid rgba(245,239,226,.1);
    counter-increment:navitem;
  }
  .nav-list__item::before{
    content:counter(navitem,decimal-leading-zero);
    font-family:var(--mono);
    font-size:.7rem;
    letter-spacing:.06em;
    color:var(--amber);
    opacity:.78;
  }
  .nav-link{
    flex:1 1 auto;
    display:block;
    padding:.98em 0;
    font-size:1rem;
    border-bottom:0;
    color:#D8E3DB;
  }
  .nav-link:hover{background:transparent;color:var(--amber-soft)}
  .nav-link[aria-current="page"]{
    color:var(--amber);
    box-shadow:inset 2px 0 0 var(--amber);
    padding-left:.7em;
  }
  .nav-link[aria-current="page"]::before{display:none}

  .nav-scrim{
    display:block;
    position:fixed;
    inset:0;
    z-index:110;
    background:rgba(5,18,15,.62);
    opacity:0;
    visibility:hidden;
    transition:opacity .3s var(--ease),visibility .3s var(--ease);
  }
  .primary-nav[data-open="true"] ~ .nav-scrim{opacity:1;visibility:visible}

  html.nav-open{overflow:hidden}

  .footer-head{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:900px){
  .version-ticker{display:none}
  .brand-line{flex:1 1 auto}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:720px){
  body{font-size:16px;line-height:1.8}
  .grid--2,.grid--3,.grid--aside{grid-template-columns:minmax(0,1fr)}
  .section__head{flex-direction:column;align-items:flex-start;gap:10px}
  .section__note{max-width:none}
}

@media (max-width:620px){
  .header-masthead__inner{font-size:.68rem;gap:8px;padding-block:6px}
  .brand-line{max-width:52vw}
  .version-chip__label{display:none}
  .version-chip__dot{display:none}
  .version-chip{font-size:.7rem;padding:.3em .55em}
  .quick-link{font-size:.7rem;letter-spacing:.06em}
  .brandmark__mark{width:36px;height:36px;font-size:.96rem}
  .brandmark__sub{display:none}
  .header-nav-band__inner{min-height:58px;padding-block:8px 18px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-contact{grid-template-columns:minmax(0,1fr);box-shadow:6px 6px 0 rgba(240,169,59,.16)}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:.4em}
  .to-top{width:40px;height:40px}
}

/* =========================================================
   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;
  }
  .version-ticker__track{animation:none;transform:none}
  [data-reveal]{opacity:1;transform:none}
  .brandmark:hover .brandmark__mark{transform:none}
  .btn--primary:hover{transform:none}
  .quick-link:hover .quick-link__arrow{transform:none}
  .to-top{transform:none}
}