/* ============================================================
   云鼎中心 · 共享样式表 /assets/site.css
   目录型内容地图 / 居中刊头 / 清透渐变 / 有机色块
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  font-size:16px;
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}
html[data-textsize="large"]{font-size:18px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
:target,[id]{scroll-margin-top:9.5rem}

/* ---------- 2. 变量 ---------- */
:root{
  --yd-navy:#0B2A4A;
  --yd-navy-2:#071B31;
  --yd-navy-3:#123A63;
  --yd-gold:#C9A96E;
  --yd-gold-2:#EBDCBF;
  --yd-porcelain:#F7F4EF;
  --yd-blue:#2E6B8A;
  --yd-blue-2:#A9C6D6;
  --yd-ink:#10202E;
  --yd-gray:#E3E1DB;
  --yd-ok:#2F7D62;
  --yd-warn:#B4552E;

  --yd-font-display:"Source Han Serif SC","Noto Serif CJK SC","Songti SC","Source Han Serif CN",STSong,serif;
  --yd-font-body:"Source Han Sans SC","Noto Sans CJK SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --yd-font-data:"JetBrains Mono","SFMono-Regular",ui-monospace,Menlo,Consolas,monospace;

  --yd-shell-width:1220px;
  --yd-gutter:clamp(1rem,4vw,2.5rem);
  --yd-band:clamp(3.2rem,7vw,6.5rem);

  --yd-r-sm:8px;
  --yd-r-md:14px;
  --yd-r-lg:26px;
  --yd-r-organic:28px 28px 28px 6px;

  --yd-line:1px solid rgba(11,42,74,.14);
  --yd-line-soft:1px solid rgba(11,42,74,.08);
  --yd-line-light:1px solid rgba(247,244,239,.16);

  --yd-shadow-soft:0 18px 44px -30px rgba(11,42,74,.5);
  --yd-shadow-lift:0 28px 60px -32px rgba(11,42,74,.62);

  --yd-ease:cubic-bezier(.22,.61,.36,1);
  --yd-t-fast:200ms;
  --yd-t-mid:320ms;
  --yd-t-slow:450ms;
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  font-family:var(--yd-font-body);
  font-size:1rem;
  line-height:1.75;
  color:var(--yd-ink);
  background-color:var(--yd-porcelain);
  background-image:
    radial-gradient(120% 70% at 6% -14%,rgba(169,198,214,.42),transparent 62%),
    radial-gradient(95% 60% at 104% 2%,rgba(235,220,191,.58),transparent 58%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
html[data-textsize="large"] body{line-height:1.9}
h1,h2,h3,h4,h5{font-family:var(--yd-font-display);font-weight:900;line-height:1.22;letter-spacing:-.01em;color:var(--yd-navy)}
h1{font-size:clamp(1.75rem,4.4vw,2.75rem)}
h2{font-size:clamp(1.4rem,3.2vw,2.1rem)}
h3{font-size:clamp(1.15rem,2.4vw,1.45rem);font-weight:700;letter-spacing:.01em}
p{text-wrap:pretty}
strong{font-weight:700}
:focus-visible{outline:2px solid var(--yd-gold);outline-offset:3px;border-radius:4px}

.yd-num{
  font-family:var(--yd-font-data);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:0;
}

/* ---------- 4. 版心与文本容器 ---------- */
.yd-shell{
  width:100%;
  max-width:var(--yd-shell-width);
  margin-inline:auto;
  padding-inline:var(--yd-gutter);
}
.yd-prose{max-width:68ch;font-size:1.02rem;line-height:1.85;color:#1d2f3f}
.yd-prose p+p{margin-top:1em}
.yd-prose a{color:var(--yd-blue);border-bottom:1px solid rgba(46,107,138,.4)}
.yd-prose a:hover{color:var(--yd-navy);border-color:var(--yd-gold)}
.yd-rule{height:1px;border:0;background:linear-gradient(90deg,rgba(11,42,74,.22),rgba(11,42,74,.04));margin-block:2.2rem}

/* ---------- 5. 章节标题组 ---------- */
.yd-section{padding-block:var(--yd-band)}
.yd-section__label{
  display:inline-flex;align-items:center;gap:.55rem;
  font-size:.76rem;font-weight:500;letter-spacing:.22em;
  color:var(--yd-blue);
}
.yd-section__label::before{content:"";width:28px;height:1px;background:var(--yd-gold)}
.yd-section__title{
  font-family:var(--yd-font-display);font-weight:900;
  font-size:clamp(1.6rem,3.6vw,2.5rem);line-height:1.24;
  color:var(--yd-navy);margin-top:.7rem;
}
.yd-section__lead{max-width:60ch;margin-top:.9rem;font-size:1.02rem;color:#3d4f60}

/* ---------- 6. 按钮 ---------- */
.yd-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.85rem 1.6rem;border-radius:999px;
  font-size:.95rem;font-weight:600;letter-spacing:.08em;
  border:1px solid transparent;
  transition:transform var(--yd-t-fast) var(--yd-ease),background-color var(--yd-t-fast) var(--yd-ease),
             color var(--yd-t-fast) var(--yd-ease),border-color var(--yd-t-fast) var(--yd-ease);
}
.yd-btn:hover{transform:translateY(-2px)}
.yd-btn--gold{background:var(--yd-gold);color:var(--yd-navy-2)}
.yd-btn--gold:hover{background:#d8bb85}
.yd-btn--ink{background:var(--yd-navy);color:var(--yd-porcelain)}
.yd-btn--ink:hover{background:var(--yd-navy-3)}
.yd-btn--ghost{border-color:rgba(11,42,74,.3);color:var(--yd-navy)}
.yd-btn--ghost:hover{border-color:var(--yd-gold);background:rgba(201,169,110,.14)}
.yd-btn--sm{padding:.55rem 1.05rem;font-size:.83rem}

/* ---------- 7. 栅格 ---------- */
.yd-grid{display:grid;gap:clamp(1rem,2.4vw,2rem);grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){
  .yd-grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
  .yd-col-3{grid-column:span 3}
  .yd-col-4{grid-column:span 4}
  .yd-col-5{grid-column:span 5}
  .yd-col-6{grid-column:span 6}
  .yd-col-7{grid-column:span 7}
  .yd-col-8{grid-column:span 8}
  .yd-col-12{grid-column:span 12}
}

/* ---------- 8. 有机色块 ---------- */
.yd-panel{
  position:relative;
  padding:clamp(1.4rem,3vw,2.4rem);
  border-radius:var(--yd-r-organic);
  background:var(--yd-porcelain);
  border:var(--yd-line);
  box-shadow:var(--yd-shadow-soft);
}
.yd-panel--cloud{
  background:
    radial-gradient(110% 90% at 10% 0%,rgba(169,198,214,.5),transparent 62%),
    linear-gradient(160deg,rgba(235,220,191,.85),rgba(247,244,239,.9));
  border-color:rgba(201,169,110,.35);
}
.yd-panel--navy{background:linear-gradient(155deg,var(--yd-navy-2),var(--yd-navy-3));color:rgba(247,244,239,.86);border-color:rgba(201,169,110,.28)}
.yd-panel--navy h2,.yd-panel--navy h3{color:var(--yd-porcelain)}
.yd-panel--blue{background:linear-gradient(155deg,rgba(46,107,138,.92),rgba(11,42,74,.94));color:rgba(247,244,239,.86);border-color:rgba(169,198,214,.3)}
.yd-panel--blue h2,.yd-panel--blue h3{color:var(--yd-porcelain)}
.yd-panel--line{background:transparent;border:1px dashed rgba(46,107,138,.4);box-shadow:none}

/* ---------- 9. 索引 / 路线 / 图例 ---------- */
.yd-index{border-top:var(--yd-line)}
.yd-index__item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  gap:.35rem 1rem;align-items:baseline;
  padding:.9rem .3rem;border-bottom:var(--yd-line);
  transition:background-color var(--yd-t-fast) var(--yd-ease),padding-left var(--yd-t-fast) var(--yd-ease);
}
.yd-index__item:hover{background:rgba(201,169,110,.13);padding-left:.85rem}
.yd-index__no{font-family:var(--yd-font-data);font-size:.78rem;color:var(--yd-gold);letter-spacing:.04em}
.yd-index__label{font-weight:600;color:var(--yd-navy)}
.yd-index__meta{font-size:.8rem;color:var(--yd-blue);white-space:nowrap}

.yd-route-list{position:relative;padding-left:1.5rem;border-left:1px dashed rgba(46,107,138,.5)}
.yd-route-list__item{position:relative;padding:.35rem 0;font-size:.95rem;color:#33465a}
.yd-route-list__item::before{
  content:"";position:absolute;left:-1.93rem;top:1.05rem;
  width:9px;height:9px;border-radius:50%;
  background:var(--yd-porcelain);border:2px solid var(--yd-blue);
}

.yd-legend{display:flex;flex-wrap:wrap;gap:.7rem 1.3rem;font-size:.78rem;letter-spacing:.06em;color:#43576b}
.yd-legend__item{display:inline-flex;align-items:center;gap:.45rem}
.yd-legend__dot{width:9px;height:9px;border-radius:50%;background:var(--yd-blue);box-shadow:0 0 0 3px rgba(46,107,138,.16)}
.yd-legend__dot--ok{background:var(--yd-ok);box-shadow:0 0 0 3px rgba(47,125,98,.16)}
.yd-legend__dot--warn{background:var(--yd-warn);box-shadow:0 0 0 3px rgba(180,85,46,.16)}
.yd-legend__dot--gold{background:var(--yd-gold);box-shadow:0 0 0 3px rgba(201,169,110,.22)}

/* ---------- 10. 标签与数据 ---------- */
.yd-tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .62rem;border-radius:999px;
  font-size:.72rem;font-weight:500;letter-spacing:.08em;
  background:rgba(46,107,138,.12);color:var(--yd-blue);border:1px solid rgba(46,107,138,.26);
}
.yd-tag--ok{background:rgba(47,125,98,.12);color:var(--yd-ok);border-color:rgba(47,125,98,.3)}
.yd-tag--warn{background:rgba(180,85,46,.12);color:var(--yd-warn);border-color:rgba(180,85,46,.3)}
.yd-tag--gold{background:rgba(201,169,110,.2);color:#8a6a2f;border-color:rgba(201,169,110,.48)}

.yd-kv{display:grid;gap:.2rem}
.yd-kv__row{display:flex;justify-content:space-between;gap:1rem;padding:.6rem 0;border-bottom:1px dashed rgba(11,42,74,.16)}
.yd-kv__k{font-size:.9rem;color:#4b5d6e}
.yd-kv__v{font-family:var(--yd-font-data);font-variant-numeric:tabular-nums;font-weight:700;color:var(--yd-navy)}

/* ---------- 11. 面包屑 / 目录 ---------- */
.yd-crumb{padding-block:.9rem;font-size:.8rem;color:#5b6d7e}
.yd-crumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.3rem .6rem}
.yd-crumb__item{display:inline-flex;align-items:center}
.yd-crumb__item+.yd-crumb__item::before{content:"/";margin-right:.6rem;color:rgba(11,42,74,.3)}
.yd-crumb__link{color:var(--yd-blue)}
.yd-crumb__link:hover{color:var(--yd-navy);text-decoration:underline}

.yd-toc{font-size:.86rem}
@media (min-width:1100px){.yd-toc{position:sticky;top:9.5rem}}
.yd-toc__title{
  font-size:.74rem;font-weight:600;letter-spacing:.2em;color:var(--yd-blue);
  padding-bottom:.6rem;border-bottom:1px solid rgba(11,42,74,.12);margin-bottom:.6rem;
}
.yd-toc__list{display:grid;gap:.1rem}
.yd-toc__link{
  position:relative;display:block;padding:.42rem 0 .42rem .9rem;
  color:#4d5f70;border-left:2px solid rgba(11,42,74,.12);
  transition:color var(--yd-t-fast) var(--yd-ease),border-color var(--yd-t-fast) var(--yd-ease),padding-left var(--yd-t-fast) var(--yd-ease);
}
.yd-toc__link:hover{color:var(--yd-navy)}
.yd-toc__link[aria-current="true"]{
  color:var(--yd-navy);font-weight:600;
  border-left-color:var(--yd-gold);padding-left:1.2rem;
}

/* ---------- 12. 图片容器 ---------- */
.yd-figure{
  position:relative;margin:0;overflow:hidden;
  border-radius:var(--yd-r-lg);
  aspect-ratio:16/9;
  background:
    linear-gradient(155deg,rgba(11,42,74,.94),rgba(46,107,138,.78)),
    radial-gradient(120% 80% at 18% 0%,rgba(201,169,110,.55),transparent 62%);
}
.yd-figure__img{width:100%;height:100%;object-fit:cover}
.yd-figure__cap{
  position:absolute;left:0;right:0;bottom:0;margin:0;
  padding:1.2rem 1.3rem;font-size:.84rem;letter-spacing:.04em;
  color:var(--yd-porcelain);
  background:linear-gradient(0deg,rgba(7,27,49,.86),rgba(7,27,49,0));
}
.yd-figure--4x3{aspect-ratio:4/3}
.yd-figure--1x1{aspect-ratio:1/1}
.yd-figure--wide{aspect-ratio:21/9}
.yd-figure--tall{aspect-ratio:3/4}

/* ---------- 13. 云场装饰 ---------- */
.yd-cloudfield{
  position:absolute;inset:-12% -6%;pointer-events:none;
  background:
    radial-gradient(46% 56% at 16% 28%,rgba(46,107,138,.42),transparent 70%),
    radial-gradient(38% 46% at 72% 16%,rgba(201,169,110,.2),transparent 70%),
    radial-gradient(52% 62% at 90% 80%,rgba(169,198,214,.2),transparent 72%);
  animation:yd-drift 12s ease-in-out infinite;
}
@keyframes yd-drift{
  0%,100%{transform:translate3d(0,0,0)}
  50%{transform:translate3d(0,-8px,0)}
}

/* ---------- 14. 显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity var(--yd-t-slow) var(--yd-ease),transform var(--yd-t-slow) var(--yd-ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 15. 刊头 ---------- */
.yd-skip{
  position:absolute;left:50%;top:-5rem;z-index:130;
  transform:translateX(-50%);
  padding:.7rem 1.4rem;border-radius:0 0 var(--yd-r-sm) var(--yd-r-sm);
  background:var(--yd-gold);color:var(--yd-navy-2);
  font-weight:700;letter-spacing:.08em;
  transition:top var(--yd-t-fast) var(--yd-ease);
}
.yd-skip:focus{top:0}

.yd-header{
  position:sticky;top:0;z-index:80;
  background:rgba(247,244,239,.97);
  border-bottom:1px solid rgba(11,42,74,.12);
  transition:box-shadow var(--yd-t-mid) var(--yd-ease),background-color var(--yd-t-mid) var(--yd-ease);
}
.yd-header[data-stuck]{
  box-shadow:0 16px 36px -28px rgba(11,42,74,.85);
  background:rgba(247,244,239,.99);
}

.yd-header__rail{
  background:var(--yd-navy-2);
  color:rgba(247,244,239,.84);
  max-height:6rem;overflow:hidden;
  transition:max-height var(--yd-t-mid) var(--yd-ease),opacity var(--yd-t-mid) var(--yd-ease);
}
.yd-header[data-stuck] .yd-header__rail{max-height:0;opacity:0}
.yd-rail{
  display:flex;align-items:center;justify-content:space-between;
  gap:.5rem 1.25rem;flex-wrap:wrap;
  padding-block:.5rem;font-size:.78rem;
}
.yd-rail__note{margin:0;letter-spacing:.1em;color:var(--yd-gold-2)}
.yd-rail__tools{display:flex;align-items:center;gap:1.15rem;flex-wrap:wrap}
.yd-rail__link{color:rgba(247,244,239,.86);border-bottom:1px solid transparent;transition:color var(--yd-t-fast) var(--yd-ease),border-color var(--yd-t-fast) var(--yd-ease)}
.yd-rail__link:hover{color:var(--yd-gold);border-bottom-color:var(--yd-gold)}
.yd-rail__stat{color:rgba(247,244,239,.66)}
.yd-rail__stat .yd-num{color:var(--yd-gold);font-weight:700}
.yd-rail__label-short{display:none}
.yd-rail__btn{
  padding:.18rem .7rem;border-radius:999px;
  border:1px solid rgba(201,169,110,.45);
  font-size:.72rem;letter-spacing:.08em;color:var(--yd-gold-2);
  transition:background-color var(--yd-t-fast) var(--yd-ease),color var(--yd-t-fast) var(--yd-ease);
}
.yd-rail__btn:hover{background:rgba(201,169,110,.18)}
.yd-rail__btn[aria-pressed="true"]{background:var(--yd-gold);color:var(--yd-navy-2);border-color:var(--yd-gold)}

.yd-masthead{padding-block:1.05rem .85rem;transition:padding var(--yd-t-mid) var(--yd-ease)}
.yd-masthead__inner{
  position:relative;
  display:grid;grid-template-columns:1fr auto 1fr;
  align-items:center;gap:1rem;
}
.yd-masthead__wing{margin:0;font-size:.76rem;letter-spacing:.14em;color:var(--yd-blue)}
.yd-masthead__wing--right{text-align:right}
.yd-winglink{border-bottom:1px dashed rgba(46,107,138,.55);padding-bottom:2px;transition:color var(--yd-t-fast) var(--yd-ease),border-color var(--yd-t-fast) var(--yd-ease)}
.yd-winglink:hover{color:var(--yd-navy);border-color:var(--yd-gold)}
.yd-header[data-stuck] .yd-masthead{padding-block:.45rem}
.yd-header[data-stuck] .yd-masthead__wing{opacity:0;visibility:hidden}

.yd-brand{display:flex;align-items:center;gap:.75rem;justify-self:center}
.yd-brand__mark{
  position:relative;flex:none;
  width:44px;height:44px;border-radius:16px 16px 16px 5px;
  background:linear-gradient(150deg,var(--yd-navy) 6%,var(--yd-blue) 100%);
  box-shadow:inset 0 0 0 1.5px rgba(201,169,110,.75),0 12px 24px -16px rgba(11,42,74,.9);
  transition:width var(--yd-t-mid) var(--yd-ease),height var(--yd-t-mid) var(--yd-ease),border-radius var(--yd-t-mid) var(--yd-ease);
}
.yd-brand__mark::before{
  content:"";position:absolute;left:50%;top:9px;transform:translateX(-50%);
  width:22px;height:11px;border:2px solid var(--yd-gold);border-bottom:0;
  border-radius:22px 22px 0 0;
}
.yd-brand__mark::after{
  content:"";position:absolute;left:50%;bottom:11px;transform:translateX(-50%);
  width:20px;height:2px;border-radius:2px;background:var(--yd-gold);
}
.yd-brand__text{display:flex;flex-direction:column;line-height:1.15}
.yd-brand__name{
  font-family:var(--yd-font-display);font-weight:900;
  font-size:clamp(1.5rem,3.4vw,2rem);letter-spacing:.08em;color:var(--yd-navy);
  transition:font-size var(--yd-t-mid) var(--yd-ease);
}
.yd-brand__note{font-size:.68rem;letter-spacing:.2em;color:var(--yd-blue)}
.yd-header[data-stuck] .yd-brand__mark{width:34px;height:34px;border-radius:12px 12px 12px 4px}
.yd-header[data-stuck] .yd-brand__mark::before{top:7px;width:17px;height:8px;border-width:1.6px}
.yd-header[data-stuck] .yd-brand__mark::after{bottom:8px;width:15px}
.yd-header[data-stuck] .yd-brand__name{font-size:clamp(1.2rem,2.4vw,1.5rem)}

.yd-nav-toggle{
  display:none;position:absolute;right:0;top:50%;transform:translateY(-50%);
  align-items:center;gap:.45rem;
  padding:.42rem .85rem;border-radius:999px;
  border:1px solid rgba(11,42,74,.22);
  font-size:.76rem;letter-spacing:.12em;color:var(--yd-navy);
}
.yd-nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.yd-nav-toggle__bars::before,
.yd-nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:var(--yd-gold);
  transition:transform var(--yd-t-fast) var(--yd-ease),top var(--yd-t-fast) var(--yd-ease);
}
.yd-nav-toggle__bars::before{top:0}
.yd-nav-toggle__bars::after{top:8px}
.yd-nav-toggle[aria-expanded="true"] .yd-nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.yd-nav-toggle[aria-expanded="true"] .yd-nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

.yd-nav{border-top:1px solid rgba(11,42,74,.1);background:linear-gradient(180deg,rgba(227,225,219,.55),rgba(247,244,239,0))}
.yd-nav__list{
  display:flex;justify-content:center;flex-wrap:wrap;
  gap:clamp(.6rem,2.4vw,2.4rem);
  max-width:var(--yd-shell-width);margin-inline:auto;
  padding-inline:var(--yd-gutter);
}
.yd-nav__link{
  position:relative;display:inline-block;
  padding:.85rem .1rem;font-size:.95rem;font-weight:500;letter-spacing:.06em;
  color:rgba(16,32,46,.78);
  transition:color var(--yd-t-fast) var(--yd-ease);
}
.yd-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:.35rem;height:2px;
  background:var(--yd-gold);transform:scaleX(0);transform-origin:left;
  transition:transform var(--yd-t-fast) var(--yd-ease);
}
.yd-nav__link:hover{color:var(--yd-navy)}
.yd-nav__link:hover::after{transform:scaleX(1)}
.yd-nav__link[aria-current="page"]{color:var(--yd-navy);font-weight:700}
.yd-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.yd-progress{position:relative;height:2px;background:rgba(11,42,74,.08);overflow:hidden}
.yd-progress__bar{
  display:block;width:0;height:100%;
  background:linear-gradient(90deg,var(--yd-blue),var(--yd-gold));
  transition:width 120ms linear;
}

.yd-totop{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:70;
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.6rem 1rem;border-radius:999px;
  background:var(--yd-navy);color:var(--yd-porcelain);
  font-size:.78rem;letter-spacing:.1em;
  box-shadow:var(--yd-shadow-lift);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity var(--yd-t-mid) var(--yd-ease),transform var(--yd-t-mid) var(--yd-ease),visibility var(--yd-t-mid) var(--yd-ease);
}
.yd-totop.is-visible{opacity:1;visibility:visible;transform:none}
.yd-totop:hover{background:var(--yd-navy-3)}

.yd-quickbar{display:none}

/* ---------- 16. 页脚 ---------- */
.yd-footer{
  position:relative;overflow:hidden;
  margin-top:var(--yd-band);
  background:var(--yd-navy-2);
  color:rgba(247,244,239,.78);
}
.yd-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(85% 60% at 10% 0%,rgba(46,107,138,.45),transparent 64%),
    radial-gradient(65% 55% at 94% 6%,rgba(201,169,110,.22),transparent 60%);
}
.yd-footer>*:not(.yd-cloudfield){position:relative;z-index:1}

.yd-footer__top{
  display:grid;gap:2.4rem;
  padding-block:clamp(2.6rem,6vw,4.4rem) 2.2rem;
  grid-template-columns:minmax(0,1fr);
}
@media (min-width:900px){.yd-footer__top{grid-template-columns:minmax(230px,1fr) 2.3fr;gap:3rem}}

.yd-footer__brand{display:flex;flex-direction:column;gap:.5rem;align-items:flex-start}
.yd-footer__mark{
  position:relative;width:46px;height:46px;border-radius:16px 16px 16px 5px;
  background:linear-gradient(150deg,var(--yd-navy-3),var(--yd-blue));
  box-shadow:inset 0 0 0 1.5px rgba(201,169,110,.8);
}
.yd-footer__mark::before{
  content:"";position:absolute;left:50%;top:10px;transform:translateX(-50%);
  width:22px;height:11px;border:2px solid var(--yd-gold);border-bottom:0;border-radius:22px 22px 0 0;
}
.yd-footer__mark::after{
  content:"";position:absolute;left:50%;bottom:12px;transform:translateX(-50%);
  width:20px;height:2px;border-radius:2px;background:var(--yd-gold);
}
.yd-footer__name{
  margin:0;font-family:var(--yd-font-display);font-weight:900;
  font-size:1.6rem;letter-spacing:.1em;color:var(--yd-porcelain);
}
.yd-footer__tagline{margin:0;font-size:.84rem;letter-spacing:.14em;color:var(--yd-gold-2)}
.yd-footer__route{
  margin:.4rem 0 0;font-family:var(--yd-font-data);font-size:.72rem;
  letter-spacing:.22em;color:rgba(169,198,214,.85);
}

.yd-footer__cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.8rem 1.2rem}
@media (min-width:560px){.yd-footer__cols{grid-template-columns:repeat(4,minmax(0,1fr))}}
.yd-footer__coltitle{
  margin:0 0 .9rem;font-family:var(--yd-font-body);
  font-size:.76rem;font-weight:600;letter-spacing:.2em;color:var(--yd-gold);
}
.yd-footer__links{display:grid;gap:.6rem}
.yd-footer__link{
  display:inline-block;font-size:.9rem;color:rgba(247,244,239,.74);
  transition:color var(--yd-t-fast) var(--yd-ease),transform var(--yd-t-fast) var(--yd-ease);
}
.yd-footer__link:hover{color:var(--yd-porcelain);transform:translateX(3px)}

.yd-footer__contact{
  display:grid;gap:1.6rem;
  padding-block:2rem 2.2rem;
  border-top:var(--yd-line-light);
  grid-template-columns:minmax(0,1fr);
}
@media (min-width:900px){.yd-footer__contact{grid-template-columns:1.25fr 1fr;gap:2.5rem}}
.yd-contact-list{display:grid;gap:.8rem}
.yd-contact-list__item{display:flex;gap:.85rem;align-items:flex-start;margin:0;font-size:.9rem}
.yd-contact-list__key{
  flex:none;min-width:4.6rem;padding-top:.15rem;
  font-size:.76rem;letter-spacing:.12em;color:var(--yd-gold-2);
}
.yd-contact-list__val{color:rgba(247,244,239,.88);word-break:break-all}
.yd-footer__note{margin:0;max-width:52ch;font-size:.86rem;line-height:1.8;color:rgba(247,244,239,.62)}

.yd-footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.75rem 1.6rem;
  padding-block:1.4rem 1.8rem;
  border-top:var(--yd-line-light);
  font-size:.78rem;color:rgba(247,244,239,.6);
}
.yd-footer__icp{margin:0;font-family:var(--yd-font-data);letter-spacing:.04em}
.yd-footer__legal-links{display:flex;flex-wrap:wrap;gap:1.1rem}
.yd-footer__legal-link{color:rgba(247,244,239,.72);border-bottom:1px solid transparent;transition:color var(--yd-t-fast) var(--yd-ease),border-color var(--yd-t-fast) var(--yd-ease)}
.yd-footer__legal-link:hover{color:var(--yd-gold);border-bottom-color:var(--yd-gold)}
.yd-footer__footnote{margin:0;letter-spacing:.04em}

/* ---------- 17. 响应式：平板与手机 ---------- */
@media (max-width:900px){
  .yd-masthead__wing{display:none}
  .yd-masthead__inner{grid-template-columns:minmax(0,1fr)}
  .yd-brand{justify-self:start;padding-right:5.5rem}
  .yd-nav-toggle{display:inline-flex}

  .yd-nav{display:none;background:var(--yd-porcelain)}
  .yd-nav[data-open]{display:block;animation:yd-nav-in var(--yd-t-mid) var(--yd-ease) both}
  .yd-nav__list{flex-direction:column;gap:0;padding-block:.4rem 1rem}
  .yd-nav__link{display:block;padding:.9rem 0;font-size:1.02rem;border-bottom:1px solid rgba(11,42,74,.08)}
  .yd-nav__link::after{display:none}
  .yd-nav__link[aria-current="page"]{color:var(--yd-navy);padding-left:.9rem;border-left:3px solid var(--yd-gold)}

  .yd-quickbar{
    position:fixed;left:0;right:0;bottom:0;z-index:90;
    display:flex;align-items:center;gap:.55rem;
    padding:.5rem var(--yd-gutter) calc(.5rem + env(safe-area-inset-bottom,0px));
    background:rgba(7,27,49,.97);
    color:rgba(247,244,239,.8);
    font-size:.76rem;letter-spacing:.06em;
    box-shadow:0 -14px 32px -22px rgba(0,0,0,.9);
  }
  .yd-quickbar__stat{white-space:nowrap}
  .yd-quickbar__stat .yd-num{color:var(--yd-gold);font-weight:700}
  .yd-quickbar__btn{
    padding:.2rem .6rem;border-radius:999px;
    border:1px solid rgba(201,169,110,.45);color:var(--yd-gold-2);
    font-size:.74rem;letter-spacing:.08em;
  }
  .yd-quickbar__btn[aria-pressed="true"]{background:var(--yd-gold);color:var(--yd-navy-2)}
  .yd-quickbar__link{margin-left:auto;color:rgba(247,244,239,.86);white-space:nowrap}
  .yd-quickbar__link--gold{color:var(--yd-gold);font-weight:600}
  .yd-quickbar__link+.yd-quickbar__link{margin-left:.6rem}

  body{padding-bottom:3.4rem}
  .yd-totop{bottom:calc(3.6rem + env(safe-area-inset-bottom,0px))}
}
@keyframes yd-nav-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

@media (max-width:640px){
  .yd-rail{justify-content:space-between;font-size:.72rem;gap:.4rem}
  .yd-rail__note{display:none}
  .yd-rail__tools{width:100%;justify-content:space-between;gap:.4rem}
  .yd-rail__label{display:none}
  .yd-rail__label-short{display:inline}
}
@media (max-width:380px){
  .yd-quickbar__stat{display:none}
  .yd-brand__note{display:none}
}

/* ---------- 18. 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .yd-cloudfield{animation:none}
  [data-reveal]{opacity:1;transform:none}
  .yd-totop{transform:none}
  .yd-btn:hover,.yd-footer__link:hover,.yd-index__item:hover{transform:none}
}