/* =========================================================
   金沙平台 · 共享样式 /assets/site.css
   设计语汇：堆叠画板 · 沙丘曲线 · 印刷线 · 坐标索引
   ========================================================= */

:root{
  --gold:#D4A017;
  --gold-soft:#E4B335;
  --clay:#C96F3B;
  --oasis:#1F7A6B;
  --night:#1B2A4A;
  --paper:#FDFBF6;
  --sand:#F7F1E4;
  --ink:#2B241C;
  --warm:#6E6558;
  --mist:#A8CFC7;
  --rule:#D8CEBE;
  --night-ink:#EFE9DC;
  --night-dim:rgba(253,251,246,.68);
  --maxw:1180px;
  --pad:clamp(18px,4vw,40px);
  --radius:2px;
  --shadow-panel:0 18px 42px -30px rgba(43,36,28,.55);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Noto Sans Mono CJK SC","Courier New",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--oasis);outline-offset:3px}
.site-footer :focus-visible,.site-header[data-state="overlay"] :focus-visible{outline-color:var(--gold)}
::selection{background:var(--gold);color:var(--ink)}

/* ---------- 中文排版基底 ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:1024px){ body{font-size:17px} }
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.2;color:var(--ink)}
h1{font-size:clamp(2rem,4.6vw,3.4rem)}
h2{font-size:clamp(1.6rem,2.8vw,2.4rem)}
h3{font-size:clamp(1.12rem,1.7vw,1.42rem);font-weight:700;letter-spacing:-.01em}
h4{font-size:1rem;font-weight:700}
p{font-weight:400}
strong,b{font-weight:700}
#main-content{scroll-margin-top:112px}

/* ---------- 容器与通用布局 ---------- */
.shell{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(48px,7vw,96px)}
.grid{display:grid;gap:clamp(16px,2.6vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(228px,1fr))}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 画板 ---------- */
.panel{
  position:relative;
  background:var(--paper);
  border:1px solid var(--rule);
  box-shadow:var(--shadow-panel);
  padding:clamp(20px,3.2vw,36px);
  border-radius:var(--radius);
}
.panel--sand{background:var(--sand)}
.panel--slate{background:var(--night);border-color:rgba(253,251,246,.16);color:var(--night-ink)}
.panel--slate h2,.panel--slate h3{color:var(--night-ink)}
.panel--slant{clip-path:polygon(0 0,100% 0,100% 100%,0 calc(100% - 28px))}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.6em;
  padding:13px 22px;border:1px solid transparent;border-radius:var(--radius);
  font-size:.95rem;font-weight:700;line-height:1.2;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--gold{background:var(--gold);color:var(--ink);border-color:rgba(43,36,28,.18)}
.btn--gold:hover{background:var(--gold-soft)}
.btn--oasis{background:var(--oasis);color:var(--paper)}
.btn--oasis:hover{background:#26897A}
.btn--ghost{border-color:var(--rule);color:var(--ink)}
.btn--ghost:hover{border-color:var(--oasis);color:var(--oasis)}
.btn__coord{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;opacity:.72}

/* ---------- 标签与索引字 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.45em;
  padding:4px 9px;border:1px solid var(--rule);border-radius:var(--radius);
  background:var(--sand);color:var(--warm);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;line-height:1.5;
}
.tag--gold{border-color:rgba(212,160,23,.5);background:rgba(212,160,23,.12);color:#87650A}
.tag--clay{border-color:rgba(201,111,59,.45);background:rgba(201,111,59,.1);color:#A0522A}
.tag--oasis{border-color:rgba(31,122,107,.42);background:rgba(31,122,107,.1);color:#186355}
.index-label{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--warm);
}
.index-label::before{content:"";width:18px;height:2px;background:var(--gold);flex:none}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.55em;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--warm);padding-block:16px;
}
.crumbs a{transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--oasis)}
.crumbs__sep{color:var(--rule)}
.crumbs [aria-current="page"]{color:var(--ink)}

/* ---------- 正文 ---------- */
.prose{max-width:70ch}
.prose>*+*{margin-top:1.1em}
.prose p{line-height:1.85;color:#3A3227}
.prose h2{margin-top:2em;font-size:clamp(1.4rem,2.2vw,1.9rem)}
.prose h3{margin-top:1.6em}
.prose ul{display:grid;gap:.55em}
.prose ul li{position:relative;padding-left:1.3em}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:8px;height:8px;background:var(--gold);transform:rotate(45deg);
}
.prose a{color:var(--oasis);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--clay)}
.prose blockquote{border-left:3px solid var(--gold);background:var(--sand);padding:16px 20px;color:var(--warm)}
.prose table{font-size:.95rem;border:1px solid var(--rule);margin-top:1.4em}
.prose th,.prose td{padding:10px 12px;border-bottom:1px solid var(--rule);text-align:left}
.prose th{background:var(--sand);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;font-weight:500}
.prose tr:nth-child(even) td{background:rgba(168,207,199,.14)}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  background:var(--sand);
  border:1px solid var(--rule);
  border-radius:var(--radius);
}
.media-frame>img,.media-frame>picture>img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(140deg,rgba(31,122,107,.16),rgba(27,42,74,0) 58%,rgba(201,111,59,.14));
}
.media-frame__tag{
  position:absolute;left:12px;bottom:12px;z-index:2;
  margin:0;padding:4px 9px;border-radius:var(--radius);
  background:rgba(253,251,246,.92);color:var(--ink);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;
}

/* ---------- 滚动显现 ---------- */
.has-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* =========================================================
   头部
   ========================================================= */
.skip-link{
  position:absolute;left:14px;top:-64px;z-index:300;
  padding:12px 18px;border-radius:var(--radius);
  background:var(--night);color:var(--paper);
  font-size:.9rem;font-weight:700;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

.site-header{
  position:sticky;top:0;z-index:120;
  width:100%;
  color:var(--ink);
  background:var(--paper);
  border-bottom:1px solid var(--rule);
  transition:background .25s var(--ease),color .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease);
}
.site-header a{color:inherit}

/* 坐标窄带 */
.site-header__rail{
  height:28px;overflow:hidden;
  background:var(--night);
  color:rgba(253,251,246,.72);
  border-bottom:1px solid rgba(253,251,246,.1);
  transition:height .25s var(--ease),opacity .25s var(--ease),background .25s var(--ease);
}
.site-header__rail .shell{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;height:28px;
}
.rail-coord,.rail-status{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;white-space:nowrap;
}
.rail-status{color:var(--mist)}

/* 主栏 */
.site-header__bar{
  display:flex;align-items:center;
  gap:clamp(10px,2vw,26px);
  height:78px;
  transition:height .25s var(--ease);
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__glyph{position:relative;display:block;width:36px;height:36px;flex:0 0 auto}
.brand__glyph::before,.brand__glyph::after{content:"";position:absolute;left:50%;top:50%;border-radius:2px}
.brand__glyph::before{width:24px;height:24px;margin:-12px 0 0 -12px;background:var(--gold);transform:rotate(45deg)}
.brand__glyph::after{width:24px;height:24px;margin:-12px 0 0 -12px;border:2px solid var(--clay);transform:rotate(45deg) translate(-4px,4px)}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{display:block;font-size:1.06rem;font-weight:800;letter-spacing:.02em;line-height:1.15}
.brand__sub{
  display:block;margin-top:3px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;
  color:var(--warm);line-height:1.4;white-space:nowrap;
}

/* 导航 */
.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:clamp(4px,1.4vw,18px)}
.site-nav__item{display:block}
.site-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 4px;font-size:.95rem;font-weight:500;
  color:inherit;white-space:nowrap;
  transition:color .2s var(--ease);
}
.site-nav__index{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;
  color:var(--warm);transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:4px;right:4px;bottom:2px;height:2px;
  background:var(--gold);transform:scaleX(0);transform-origin:right;
  transition:transform .22s var(--ease),background .22s var(--ease);
}
.site-nav__link:hover{color:var(--oasis)}
.site-nav__link:hover .site-nav__index{color:var(--oasis)}
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after{transform:scaleX(1);transform-origin:left}
.site-nav__link[aria-current="page"]{font-weight:800}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--clay)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--clay)}

/* 索引触发按钮 */
.index-trigger{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 10px;border:1px solid var(--rule);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--warm);white-space:nowrap;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.index-trigger:hover{color:var(--oasis);border-color:var(--mist)}
.index-trigger kbd{
  font-family:var(--font-mono);font-size:10px;letter-spacing:0;
  padding:1px 4px;border:1px solid var(--rule);border-radius:2px;
  background:var(--sand);color:var(--warm);
}

/* 头部 CTA */
.header-cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 16px;border-radius:var(--radius);
  background:var(--gold);color:var(--ink)!important;
  border:1px solid rgba(43,36,28,.18);
  font-size:.88rem;font-weight:800;white-space:nowrap;
  transition:background .2s var(--ease),transform .2s var(--ease);
}
.header-cta:hover{background:var(--gold-soft);transform:translateY(-1px)}
.header-cta__coord{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;opacity:.62}

/* 移动端开关 */
.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:44px;flex:0 0 auto;
  border:1px solid var(--rule);border-radius:var(--radius);
  color:inherit;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--mist)}
.nav-toggle__bars{
  position:relative;display:block;width:20px;height:2px;
  background:currentColor;
  transition:background .2s var(--ease);
}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;
  background:currentColor;transition:transform .2s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle{background:var(--sand);border-color:var(--mist)}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* 头部状态：透明叠加 */
.site-header[data-state="overlay"]{
  background:transparent;
  border-bottom-color:transparent;
  box-shadow:none;
  color:var(--paper);
}
.site-header[data-state="overlay"] .site-header__rail{
  background:transparent;
  border-bottom-color:rgba(253,251,246,.18);
  color:rgba(253,251,246,.66);
}
.site-header[data-state="overlay"] .rail-status{color:rgba(253,251,246,.82)}
.site-header[data-state="overlay"] .brand__sub{color:rgba(253,251,246,.72)}
.site-header[data-state="overlay"] .site-nav__index{color:rgba(253,251,246,.6)}
.site-header[data-state="overlay"] .site-nav__link,
.site-header[data-state="overlay"] .brand__name{text-shadow:0 1px 14px rgba(27,42,74,.45)}
.site-header[data-state="overlay"] .site-nav__link:hover{color:var(--gold)}
.site-header[data-state="overlay"] .site-nav__link:hover .site-nav__index{color:var(--gold)}
.site-header[data-state="overlay"] .index-trigger{
  border-color:rgba(253,251,246,.4);color:rgba(253,251,246,.86);
}
.site-header[data-state="overlay"] .nav-toggle{border-color:rgba(253,251,246,.42)}

/* 头部状态：滚动收窄 */
.site-header[data-state="compact"]{
  box-shadow:0 14px 34px -26px rgba(43,36,28,.7);
}
.site-header[data-state="compact"] .site-header__rail{height:0;opacity:0;border-bottom-width:0}
.site-header[data-state="compact"] .site-header__bar{height:58px}

/* ---------- 站内索引面板 ---------- */
.index-panel{
  position:fixed;inset:0;z-index:200;
  display:grid;place-items:start center;
  padding:clamp(16px,7vh,90px) var(--pad);
  background:rgba(27,42,74,.58);
  -webkit-backdrop-filter:blur(3px);
  backdrop-filter:blur(3px);
  overflow-y:auto;
}
.index-panel[hidden]{display:none}
.index-panel__card{
  width:min(720px,100%);
  background:var(--paper);color:var(--ink);
  border:1px solid var(--rule);
  border-top:4px solid var(--gold);
  box-shadow:0 44px 80px -40px rgba(20,16,10,.75);
  padding:clamp(18px,3vw,32px);
  border-radius:var(--radius);
}
.index-panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--rule);
}
.index-panel__title{
  font-size:1.15rem;font-weight:800;letter-spacing:-.01em;
  display:flex;align-items:center;gap:10px;
}
.index-panel__title::before{content:"";width:8px;height:8px;background:var(--clay);transform:rotate(45deg)}
.index-panel__close{
  padding:7px 12px;border:1px solid var(--rule);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--warm);transition:color .18s var(--ease),border-color .18s var(--ease);
}
.index-panel__close:hover{color:var(--clay);border-color:var(--clay)}
.index-panel__hint{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--warm);margin-bottom:10px;
}
.index-panel__list{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
.index-panel__link{
  display:flex;align-items:baseline;gap:12px;
  padding:12px 8px;font-size:.98rem;font-weight:500;
  border-bottom:1px solid rgba(216,206,190,.7);
  transition:background .18s var(--ease),color .18s var(--ease),padding-left .18s var(--ease);
}
.index-panel__link:hover{background:var(--sand);color:var(--oasis);padding-left:14px}
.index-panel__coord{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--gold);flex:none;
}
body[data-scroll-lock="true"]{overflow:hidden}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(40px,7vw,88px);
  padding-top:clamp(40px,6vw,72px);
  background:var(--night);
  color:var(--night-ink);
  border-top:3px solid var(--gold);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;left:-12%;right:-12%;bottom:-160px;height:360px;
  pointer-events:none;
  background:
    radial-gradient(58% 100% at 26% 100%,rgba(201,111,59,.34),rgba(201,111,59,0) 72%),
    radial-gradient(52% 100% at 78% 100%,rgba(31,122,107,.36),rgba(31,122,107,0) 74%);
}
.site-footer .shell{position:relative;z-index:1}

.footer-top{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:clamp(24px,4vw,64px);align-items:start;
  padding-bottom:clamp(26px,4vw,44px);
  border-bottom:1px solid rgba(253,251,246,.14);
}
.footer-ident{min-width:0}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand__name{display:block;font-size:1.14rem;font-weight:800;letter-spacing:.02em;line-height:1.2}
.footer-brand__tag{
  display:block;margin-top:3px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--mist);
}
.footer-lede{
  margin-top:14px;max-width:36ch;
  font-size:.94rem;line-height:1.8;color:var(--night-dim);
}

.footer-contact{display:grid;gap:9px;font-style:normal;min-width:0}
.footer-contact__row{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:baseline}
.footer-contact__key{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold);
}
.footer-contact__val{color:rgba(253,251,246,.9);font-size:.94rem;word-break:break-word}
.footer-contact__note{
  margin-top:6px;max-width:38ch;
  font-size:.8rem;line-height:1.7;color:rgba(253,251,246,.56);
}

.footer-body{
  display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(28px,4vw,48px);
}
.footer-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,28px)}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;align-items:center;gap:8px;
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--mist);
}
.footer-col__title::before{content:"";width:6px;height:6px;background:var(--gold);transform:rotate(45deg);flex:none}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.92rem;color:rgba(253,251,246,.82);
  transition:color .18s var(--ease);
}
.footer-link::before{
  content:"";width:10px;height:1px;background:currentColor;opacity:.45;flex:none;
  transition:width .18s var(--ease),background .18s var(--ease),opacity .18s var(--ease);
}
.footer-link:hover{color:var(--gold)}
.footer-link:hover::before{width:18px;background:var(--gold);opacity:1}

/* 费用周期卡片 */
.footer-cost{
  position:relative;
  background:var(--sand);color:var(--ink);
  border:1px solid var(--rule);
  padding:clamp(18px,2.6vw,28px);
  box-shadow:0 26px 50px -34px rgba(0,0,0,.8);
  transform:translateY(-8px);
  border-radius:var(--radius);
}
.footer-cost::before{content:"";position:absolute;left:0;top:0;width:64px;height:4px;background:var(--clay)}
.footer-cost__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--clay);
}
.footer-cost__title{margin:8px 0 10px;font-size:1.08rem;font-weight:800;letter-spacing:-.01em}
.footer-cost__body{font-size:.9rem;line-height:1.8;color:var(--warm)}
.footer-cost__sub{
  margin-top:16px;padding-top:14px;
  border-top:1px dashed var(--rule);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--warm);
}
.footer-cost__entries{display:grid;gap:8px;margin-top:10px}
.footer-cost__entry{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;
  align-items:baseline;font-size:.88rem;line-height:1.6;color:var(--ink);
}
.footer-cost__n{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:#A4760C}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  padding-block:18px 26px;
  border-top:1px solid rgba(253,251,246,.14);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(253,251,246,.58);
}
.footer-legal__meta{display:flex;flex-wrap:wrap;gap:8px 20px;margin:0}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1120px){
  .index-trigger{display:none}
}

@media (max-width:980px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    margin-left:0;z-index:5;
    display:block;
    padding:8px var(--pad) 22px;
    background:var(--paper);color:var(--ink);
    border-top:1px solid var(--rule);
    border-bottom:1px solid var(--rule);
    box-shadow:0 26px 52px -30px rgba(43,36,28,.6);
    max-height:calc(100vh - 108px);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{opacity:1;visibility:visible;transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item+.site-nav__item{border-top:1px solid var(--rule)}
  .site-nav__link{
    display:flex;width:100%;padding:14px 2px;
    font-size:1.02rem;color:var(--ink);text-shadow:none;
  }
  .site-nav__link::after{display:none}
  .site-nav__link:hover{color:var(--oasis)}
  .site-nav__link[aria-current="page"]{color:var(--clay)}
  .site-nav__link[aria-current="page"] .site-nav__index{color:var(--clay)}
  .site-header[data-state="overlay"] .site-nav{background:var(--paper);color:var(--ink)}
  .site-header[data-state="overlay"] .site-nav__link{color:var(--ink);text-shadow:none}
  .site-header[data-state="overlay"] .site-nav__index{color:var(--warm)}
  .index-panel__list{grid-template-columns:1fr}
}

@media (max-width:900px){
  .footer-top{grid-template-columns:1fr}
  .footer-body{grid-template-columns:1fr}
  .footer-cost{transform:none}
}

@media (max-width:760px){
  .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

@media (max-width:560px){
  .site-header__bar{height:66px;gap:8px}
  .site-header[data-state="compact"] .site-header__bar{height:56px}
  .brand__glyph{width:30px;height:30px}
  .brand__glyph::before,.brand__glyph::after{width:20px;height:20px;margin:-10px 0 0 -10px}
  .brand__name{font-size:.98rem}
  .header-cta{padding:9px 11px;font-size:.8rem;gap:5px}
  .header-cta__coord{display:none}
  .footer-links{grid-template-columns:1fr}
  .rail-status{display:none}
}

@media (max-width:420px){
  .brand__sub{display:none}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .has-js [data-reveal]{opacity:1!important;transform:none!important}
  .footer-cost{transform:none}
}