/* =========================================================
   千嬴国际官 · 共享样式 /assets/site.css
   头部、页脚、排版底座、通用组件
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol,li{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,video,canvas{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#101820;
  --ink-soft:#33454e;
  --paper:#FBF9F5;
  --deep:#0A2C3D;
  --lake:#0F6E8C;
  --lake-mid:#4E9DB5;
  --mist:#DCEAEF;
  --gold:#F0B429;
  --gold-soft:#FBE6B0;
  --flag:#C8452A;
  --flag-deep:#8E2B1B;
  --muted:#5C7079;

  --line:rgba(16,24,32,.13);
  --line-strong:rgba(16,24,32,.30);
  --line-invert:rgba(251,249,245,.18);
  --glass:rgba(251,249,245,.72);
  --glass-soft:rgba(251,249,245,.55);

  --font-display:"PingFang SC","Noto Sans SC","Source Han Sans SC","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI","PingFang SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;

  --fs-12:12px;--fs-13:13px;--fs-16:16px;--fs-18:18px;--fs-20:20px;--fs-24:24px;

  --wrap:1240px;
  --gutter-l:clamp(20px,6vw,88px);
  --gutter-r:clamp(20px,4vw,56px);

  --ease:cubic-bezier(.22,.61,.36,1);
  --header-h:88px;
  --header-h-condensed:56px;
}

body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:var(--fs-18);
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
[id]{scroll-margin-top:calc(var(--header-h) + 24px)}

:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.section--deep :focus-visible,.site-footer :focus-visible{outline-color:var(--gold-soft)}

/* ---------- 3. 排版底座 ---------- */
.t-display{font-family:var(--font-display);font-size:clamp(56px,9vw,132px);font-weight:300;line-height:.95;letter-spacing:-.02em}
.t-headline{font-family:var(--font-display);font-size:clamp(34px,4.4vw,48px);font-weight:700;line-height:1.15;letter-spacing:-.01em}
.t-subhead{font-size:clamp(20px,2vw,24px);font-weight:600;line-height:1.4}
.t-lede{font-size:clamp(17px,1.5vw,20px);line-height:1.75;color:var(--ink-soft);max-width:62ch}
.t-index{font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--lake)}
.t-muted{color:var(--muted);font-size:var(--fs-16)}
.section--deep .t-lede,.section--deep .t-muted{color:rgba(251,249,245,.74)}

/* ---------- 4. 布局容器 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding-left:var(--gutter-l);padding-right:var(--gutter-r)}
.wrap--narrow{max-width:880px}
.wrap--wide{max-width:1440px}

.section{padding-top:clamp(64px,9vw,120px);padding-bottom:clamp(64px,9vw,120px)}
.section--tight{padding-top:clamp(40px,5vw,64px);padding-bottom:clamp(40px,5vw,64px)}
.section--mist{background:var(--mist)}
.section--deep{background:var(--deep);color:var(--paper)}
.section--deep .section-head__note{color:rgba(251,249,245,.72)}

.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 12}
@media (min-width:900px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
  .col-12{grid-column:span 12}
}

/* ---------- 5. 章节标题组 ---------- */
.section-head{display:grid;gap:12px;margin-bottom:clamp(28px,4vw,52px)}
.section-head__index{font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;color:var(--lake);text-transform:uppercase}
.section-head__title{font-family:var(--font-display);font-size:clamp(28px,4vw,46px);font-weight:700;line-height:1.15;letter-spacing:-.01em}
.section-head__note{max-width:56ch;color:var(--muted);font-size:var(--fs-16)}
@media (min-width:900px){
  .section-head{grid-template-columns:minmax(0,3fr) minmax(0,9fr);column-gap:clamp(24px,4vw,56px);align-items:start}
  .section-head__index{grid-column:1;padding-top:12px}
  .section-head__title{grid-column:2}
  .section-head__note{grid-column:2}
}
.section--deep .section-head__index{color:var(--gold)}

/* ---------- 6. 顶部导航 ---------- */
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:200;
  background:var(--deep);color:var(--paper);
  padding:12px 20px;font-size:var(--fs-13);font-weight:600;letter-spacing:.06em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.header-beam{
  position:absolute;left:0;right:0;bottom:0;height:3px;
  background:linear-gradient(90deg,var(--gold) 0%,var(--gold-soft) 16%,rgba(220,234,239,0) 40%,var(--lake-mid) 68%,var(--lake) 100%);
  transform-origin:left center;
  animation:beam-in .9s var(--ease) both;
  pointer-events:none;
}
@keyframes beam-in{from{transform:scaleX(0)}to{transform:scaleX(1)}}

.header-inner{
  max-width:var(--wrap);margin:0 auto;
  padding-left:var(--gutter-l);padding-right:var(--gutter-r);
  height:var(--header-h);
  display:flex;align-items:center;gap:clamp(16px,3vw,40px);
  transition:height .3s var(--ease);
}
.site-header[data-condensed] .header-inner{height:var(--header-h-condensed)}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;padding:6px 0}
.brand__mark{
  width:34px;height:34px;flex:0 0 auto;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--gold) 0%,var(--gold-soft) 100%);
  color:var(--deep);font-size:16px;font-weight:700;line-height:1;
  border:1px solid var(--gold);
}
.brand__text{display:flex;flex-direction:column;justify-content:center}
.brand__name{display:block;font-size:19px;font-weight:700;line-height:1.1;letter-spacing:.01em}
.brand__tag{display:block;font-size:var(--fs-12);letter-spacing:.14em;color:var(--muted);margin-top:4px}
.brand__path{display:none;align-items:center;gap:8px;font-size:var(--fs-13);color:var(--muted);letter-spacing:.04em}
.brand__sep{color:var(--line-strong)}
.site-header[data-condensed] .brand__tag{display:none}
.site-header[data-condensed] .brand__path{display:inline-flex}
.site-header[data-condensed] .brand__mark{width:28px;height:28px;font-size:14px}

.primary-nav{margin-left:auto;display:flex;align-items:center}
.nav-panel__label,.nav-panel__foot{display:none}
.nav-list{display:flex;align-items:center;gap:clamp(14px,2vw,30px)}
.nav-item{position:relative}
.nav-link{
  position:relative;display:inline-block;padding:6px 2px;
  font-size:15px;font-weight:500;color:var(--ink);letter-spacing:.03em;
  transition:color .2s var(--ease),font-size .3s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left center;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--lake)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--lake);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1);height:2px;background:var(--gold)}
.nav-link--cta{
  border:1px solid var(--gold);
  background:linear-gradient(180deg,rgba(251,230,176,.55),rgba(251,230,176,0));
  padding:9px 16px;font-weight:600;color:var(--deep);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.nav-link--cta::after{display:none}
.nav-link--cta:hover,.nav-link--cta:focus-visible{background:var(--gold);color:var(--deep)}
.nav-link--cta[aria-current="page"]{background:var(--gold);color:var(--deep)}
.site-header[data-condensed] .nav-link{font-size:14px}

.nav-toggle{
  display:none;margin-left:auto;align-items:center;gap:10px;
  padding:10px 4px;color:var(--ink);
  font-size:var(--fs-13);font-weight:600;letter-spacing:.14em;
}
.nav-toggle__bars{position:relative;display:block;width:22px;height:12px}
.nav-toggle__bars span{position:absolute;left:0;right:0;height:2px;background:currentColor;transition:transform .24s var(--ease)}
.nav-toggle__bars span:first-child{top:0}
.nav-toggle__bars span:last-child{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle[aria-expanded="true"]{color:var(--lake)}

.scroll-progress{position:absolute;left:0;right:0;bottom:0;height:2px;pointer-events:none}
.scroll-progress__bar{
  display:block;height:100%;
  background:linear-gradient(90deg,var(--gold),var(--flag),var(--lake));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}

/* 玻璃条（仅桌面，避免影响移动抽屉的定位上下文） */
@media (min-width:881px){
  .site-header[data-condensed]{
    background:var(--glass);
    -webkit-backdrop-filter:blur(14px) saturate(1.2);
    backdrop-filter:blur(14px) saturate(1.2);
    box-shadow:0 18px 40px -32px rgba(10,44,61,.6);
  }
}

/* ---------- 7. 移动端抽屉 ---------- */
body.is-nav-open{overflow:hidden}

@media (max-width:880px){
  :root{--header-h:64px;--header-h-condensed:56px}
  .brand__tag{display:none}
  .nav-toggle{display:inline-flex}

  .primary-nav{
    position:fixed;top:0;right:0;bottom:0;
    width:min(84vw,344px);
    display:flex;flex-direction:column;align-items:stretch;
    gap:0;
    padding:calc(var(--header-h) + 20px) 22px 28px;
    background:var(--paper);
    border-left:1px solid var(--line);
    box-shadow:-40px 0 70px -50px rgba(10,44,61,.75);
    transform:translateX(102%);
    visibility:hidden;
    overflow-y:auto;
    z-index:90;
    transition:transform .34s var(--ease),visibility .34s var(--ease);
  }
  .primary-nav[data-open]{transform:translateX(0);visibility:visible}

  .nav-panel__label{display:block;font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;padding-bottom:12px;border-bottom:1px solid var(--line)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-link{display:block;padding:16px 6px;font-size:17px}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{padding-left:16px;box-shadow:inset 4px 0 0 var(--gold)}
  .nav-link--cta{
    margin-top:18px;text-align:center;padding:14px 16px;
    background:var(--gold-soft);border:1px solid var(--gold);
  }
  .nav-item:has(.nav-link--cta){border-bottom:0}
  .nav-panel__foot{display:block;margin-top:auto;padding-top:24px}
  .nav-panel__meta{font-size:var(--fs-12);letter-spacing:.08em;color:var(--muted);margin-bottom:12px}
}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.04em;line-height:1.2;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--gold{background:var(--gold);color:var(--deep);border-color:var(--gold)}
.btn--gold:hover,.btn--gold:focus-visible{background:var(--gold-soft);color:var(--deep);border-color:var(--gold)}
.btn--ghost{border-color:var(--lake);color:var(--lake)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--lake);color:var(--paper)}
.btn--deep{background:var(--deep);color:var(--paper)}
.btn--deep:hover,.btn--deep:focus-visible{background:var(--lake)}
.btn--quiet{border-color:var(--line-strong);color:var(--ink)}
.btn--quiet:hover,.btn--quiet:focus-visible{border-color:var(--lake);color:var(--lake)}
.btn--block{width:100%}

/* ---------- 9. 面包屑 ---------- */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:var(--fs-13);color:var(--muted);letter-spacing:.05em}
.crumbs__item{display:inline-flex;align-items:center;gap:8px}
.crumbs__item:not(:last-child)::after{content:"/";color:var(--line-strong)}
.crumbs__item a:hover{color:var(--lake)}
.crumbs__item[aria-current="page"]{color:var(--ink)}

/* ---------- 10. 卡片 ---------- */
.card{background:var(--paper);border:1px solid var(--line);padding:clamp(20px,2.6vw,32px)}
.card--glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px) saturate(1.15);
  backdrop-filter:blur(12px) saturate(1.15);
  border-color:rgba(251,249,245,.6);
}
.card--mist{background:var(--mist);border-color:transparent}
.card--deep{background:var(--deep);color:var(--paper);border-color:transparent}
.card--deep .t-muted{color:rgba(251,249,245,.72)}

/* ---------- 11. 徽标 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid currentColor;
  font-size:var(--fs-12);font-weight:600;letter-spacing:.14em;line-height:1.4;
}
.badge--gold{color:var(--flag-deep);background:var(--gold-soft);border-color:var(--gold)}
.badge--flag{color:var(--flag);border-color:var(--flag)}
.badge--lake{color:var(--lake);border-color:var(--lake-mid)}

/* ---------- 12. 图片容器 ---------- */
.media{position:relative;display:block;overflow:hidden;background:var(--mist);border:1px solid var(--line)}
.media>img,.media>picture>img{width:100%;height:100%;object-fit:cover}
.media--panorama{aspect-ratio:21/9}
.media--wide{aspect-ratio:16/9}
.media--figure{aspect-ratio:4/3}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:3/4}
.media__placeholder{
  position:absolute;inset:0;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--mist) 0%,#eef6f8 55%,rgba(240,180,41,.14) 100%);
}
.media__placeholder::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(8deg,rgba(15,110,140,.10) 0 1px,transparent 1px 13px);
}
.media__caption{
  position:absolute;left:16px;bottom:14px;
  padding:4px 10px;font-size:var(--fs-12);font-weight:600;letter-spacing:.14em;
  color:var(--deep);background:rgba(251,249,245,.84);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}

/* ---------- 13. 时间线 ---------- */
.timeline{position:relative;padding-left:30px}
.timeline::before{
  content:"";position:absolute;left:6px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--gold),var(--lake-mid) 55%,var(--lake));
}
.timeline__item{position:relative;padding-bottom:clamp(22px,3vw,34px)}
.timeline__item::before{
  content:"";position:absolute;left:-30px;top:9px;
  width:12px;height:12px;border-radius:50%;
  background:var(--paper);border:2px solid var(--lake-mid);
}
.timeline__item[data-state="current"]::before{background:var(--gold);border-color:var(--gold);box-shadow:0 0 0 4px rgba(240,180,41,.22)}
.timeline__mark{display:block;font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;color:var(--lake);margin-bottom:4px}
.timeline__title{font-size:var(--fs-20);font-weight:600;line-height:1.4}
.timeline__meta{margin-top:6px;font-size:var(--fs-13);color:var(--muted);letter-spacing:.04em}

/* ---------- 14. 可展开内容组 ---------- */
.accordion{border-top:1px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__trigger{
  display:flex;align-items:baseline;gap:16px;width:100%;
  padding:20px 0;text-align:left;
  font-size:clamp(17px,1.7vw,20px);font-weight:600;line-height:1.45;
  transition:color .2s var(--ease);
}
.accordion__trigger:hover{color:var(--lake)}
.accordion__trigger[aria-expanded="true"]{color:var(--lake)}
.accordion__index{font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;color:var(--lake);flex:0 0 auto}
.accordion__sign{
  margin-left:auto;flex:0 0 auto;width:16px;height:16px;position:relative;
}
.accordion__sign::before,.accordion__sign::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--lake);
  transform:translate(-50%,-50%);transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.accordion__sign::before{width:14px;height:1.5px}
.accordion__sign::after{width:1.5px;height:14px}
.accordion__trigger[aria-expanded="true"] .accordion__sign::after{transform:translate(-50%,-50%) scaleY(0);opacity:0}
.accordion__panel{overflow:hidden;transition:height .3s var(--ease)}
.accordion__body{padding:0 0 26px;max-width:66ch;font-size:var(--fs-16);line-height:1.85;color:var(--ink-soft)}

/* ---------- 15. 装饰 ---------- */
.slope{background-image:repeating-linear-gradient(8deg,rgba(15,110,140,.10) 0 1px,transparent 1px 14px)}
.arc{background-image:repeating-radial-gradient(circle at 82% 18%,rgba(15,110,140,.09) 0 1px,transparent 1px 38px)}
.aurora{background:linear-gradient(100deg,var(--gold-soft) 0%,rgba(251,249,245,0) 26%,rgba(220,234,239,.92) 54%,var(--lake-mid) 82%,var(--lake) 100%)}

/* ---------- 16. 滚动显现 ---------- */
.has-js [data-reveal]{opacity:0;transform:translateY(12px)}
[data-reveal]{transition:opacity .4s var(--ease),transform .4s var(--ease)}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 17. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(72px,10vw,140px);
  background:var(--deep);
  color:rgba(251,249,245,.82);
}
.site-footer::before{
  content:"";position:absolute;right:-10%;bottom:-45%;width:70%;height:120%;
  background:radial-gradient(circle at 50% 50%,rgba(78,157,181,.28) 0%,rgba(78,157,181,0) 62%);
  pointer-events:none;
}
.site-footer::after{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,var(--gold),var(--gold-soft) 18%,rgba(220,234,239,0) 42%,var(--lake-mid) 72%,var(--lake));
}
.footer-inner{
  position:relative;z-index:1;
  max-width:var(--wrap);margin:0 auto;
  padding:clamp(48px,7vw,88px) var(--gutter-r) 0 var(--gutter-l);
}
.footer-grid{display:grid;grid-template-columns:1.15fr 1.5fr 1.15fr;gap:clamp(28px,4vw,56px)}
.footer-brand__name{font-size:22px;font-weight:700;color:var(--paper);letter-spacing:.02em}
.footer-brand__line{margin-top:12px;font-size:15px;line-height:1.8;color:rgba(251,249,245,.8);max-width:26ch}
.footer-brand__meta{margin-top:14px;font-size:var(--fs-13);letter-spacing:.04em;color:rgba(251,249,245,.55)}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.footer-group__title{
  font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--gold);margin-bottom:14px;
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-block;padding:6px 0;font-size:15px;color:rgba(251,249,245,.78);
  border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--paper);border-bottom-color:var(--gold)}

.footer-feedback{
  padding:20px;
  border:1px solid var(--line-invert);
  background:var(--glass-soft);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.footer-feedback__title{font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;color:var(--gold);text-transform:uppercase}
.footer-feedback__text{margin:12px 0 16px;font-size:14px;line-height:1.7;color:rgba(251,249,245,.72)}
.copy-btn{
  display:block;width:100%;margin-bottom:14px;padding:10px 12px;
  border:1px dashed rgba(251,249,245,.34);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;color:var(--paper);
  text-align:left;overflow-wrap:anywhere;
  transition:border-color .2s var(--ease),background .2s var(--ease),color .2s var(--ease);
}
.copy-btn:hover,.copy-btn:focus-visible{border-color:var(--gold);background:rgba(240,180,41,.12)}
.copy-btn[data-copied]{border-style:solid;border-color:var(--gold);background:var(--gold-soft);color:var(--flag-deep);font-family:var(--font-body);font-weight:600}

.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 28px;
  margin-top:clamp(32px,5vw,56px);padding:20px 0 28px;
  border-top:1px solid var(--line-invert);
  font-size:var(--fs-13);color:rgba(251,249,245,.6);letter-spacing:.04em;
}
.footer-base__item--end{margin-left:auto}

.footer-sticky{display:none}

@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-feedback{grid-column:1 / -1}
}
@media (max-width:720px){
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-base__item--end{margin-left:0}
}
@media (max-width:767px){
  body{padding-bottom:64px}
  .footer-sticky{
    display:flex;align-items:center;gap:14px;
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    padding:12px 18px calc(12px + env(safe-area-inset-bottom));
    background:rgba(10,44,61,.94);
    -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
    border-top:1px solid var(--line-invert);
  }
  .footer-sticky__label{font-size:var(--fs-12);font-weight:600;letter-spacing:.16em;color:var(--gold);text-transform:uppercase}
  .footer-sticky__link{
    margin-left:auto;padding:9px 20px;
    background:var(--gold);color:var(--deep);
    font-size:14px;font-weight:600;letter-spacing:.04em;
  }
}

/* ---------- 18. 无障碍与降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .header-beam{animation:none;transform:none}
}

@media print{
  .site-header,.footer-sticky{position:static}
  .site-footer{background:#fff;color:#000}
}