/* =========================================================
   真人对接会馆 · 共享样式 /assets/site.css
   轨道 + 画布 双图层结构，会馆档案视觉语言
   ========================================================= */

:root{
  --cinnabar:#B23A2E;
  --cinnabar-deep:#7E241C;
  --ink:#14100F;
  --ink-2:#2B2320;
  --paper:#F6F1E7;
  --sand:#EADFCB;
  --celadon:#3F6558;
  --celadon-light:#4F7A6A;
  --celadon-on-ink:#93B7A6;
  --gold:#C99A4B;
  --gold-deep:#8A6320;
  --smoke:#6B625C;

  --rail-w:232px;
  --rail-h:56px;
  --shell:1120px;

  --radius-lg:32px;
  --radius-md:18px;
  --radius-sm:10px;

  --ease:cubic-bezier(0.22,0.61,0.36,1);
  --dur:240ms;

  --serif:"Songti SC","SimSun","Source Han Serif SC","Noto Serif CJK SC","STSong",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",sans-serif;
  --mono:"IBM Plex Mono","Sarasa Mono SC","Sarasa Mono","Menlo","Consolas","Courier New",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
h1,h2,h3,h4,p,figure,blockquote,ol,ul{margin:0;}
ol,ul{padding:0;list-style:none;}
img,svg{display:block;max-width:100%;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;}
[id]{scroll-margin-top:84px;}
::selection{background:var(--cinnabar);color:var(--paper);}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px;border-radius:4px;}

/* ---------- base typography ---------- */
body{
  font-family:var(--serif);
  font-size:17px;
  line-height:1.85;
  color:var(--ink);
  background:var(--paper);
  padding-left:var(--rail-w);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{
  font-family:var(--sans);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.16;
  color:var(--ink);
}
p{max-width:40em;}
.display-xl{font-family:var(--sans);font-weight:900;font-size:clamp(42px,5.6vw,84px);line-height:1.02;letter-spacing:-.03em;}
.display-l{font-family:var(--sans);font-weight:900;font-size:clamp(30px,4vw,56px);line-height:1.08;letter-spacing:-.02em;}
.display-m{font-family:var(--sans);font-weight:900;font-size:clamp(23px,2.6vw,34px);line-height:1.22;letter-spacing:-.01em;}
.lede{font-size:clamp(17px,1.6vw,21px);line-height:1.8;color:var(--ink-2);}
.mono{font-family:var(--mono);font-size:14px;letter-spacing:.04em;}
.eyebrow{
  display:inline-block;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cinnabar-deep);
  margin-bottom:12px;
}
.note{
  font-size:15px;
  color:var(--smoke);
  border-bottom:1px solid rgba(63,101,88,.45);
  text-decoration:none;
  padding-bottom:1px;
}
.prose{max-width:40em;}
.prose p+p{margin-top:1.1em;}
.prose h2{margin-top:1.9em;margin-bottom:.6em;font-size:clamp(22px,2.2vw,30px);}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:clamp(18px,1.8vw,22px);}
.prose ul,.prose ol{margin-top:1em;display:flex;flex-direction:column;gap:.5em;}
.prose li{padding-left:1.4em;position:relative;}
.prose li::before{content:"—";position:absolute;left:0;color:var(--cinnabar);}
.hairline{height:1px;background:rgba(20,16,15,.16);border:0;margin:0;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:300;
  transform:translateY(-180%);
  background:var(--paper);
  color:var(--cinnabar-deep);
  font-family:var(--sans);
  font-weight:700;
  font-size:14px;
  letter-spacing:.02em;
  padding:12px 20px;
  border-radius:999px;
  text-decoration:none;
  box-shadow:0 10px 28px rgba(20,16,15,.32);
  transition:transform 180ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

/* ---------- 左侧轨道 / header ---------- */
.site-rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail-w);
  z-index:90;
  background-color:var(--cinnabar);
  background-image:linear-gradient(180deg,rgba(20,16,15,.26),rgba(20,16,15,0) 34%,rgba(20,16,15,.18));
  color:var(--paper);
  border-right:1px solid rgba(20,16,15,.32);
}
.rail__inner{
  height:100%;
  display:flex;
  flex-direction:column;
  gap:22px;
  padding:26px 22px 18px;
  overflow-y:auto;
  scrollbar-width:thin;
}
.rail__brand{
  flex:none;
  display:flex;
  gap:14px;
  align-items:flex-start;
  text-decoration:none;
  color:var(--paper);
}
.rail__seal{
  flex:none;
  width:54px;height:54px;
  display:grid;place-items:center;
  border:2px solid var(--gold);
  border-radius:8px;
  color:var(--gold);
  font-family:var(--sans);
  font-weight:900;
  font-size:17px;
  line-height:1;
  letter-spacing:.1em;
  writing-mode:vertical-rl;
  transform:rotate(-3deg);
  transition:transform 220ms var(--ease),background-color 220ms var(--ease);
}
.rail__brand:hover .rail__seal{transform:rotate(0deg);background:rgba(201,154,75,.14);}
.rail__lockup{display:flex;flex-direction:column;gap:10px;min-width:0;}
.rail__name{
  writing-mode:vertical-rl;
  text-orientation:upright;
  font-family:var(--sans);
  font-weight:900;
  font-size:22px;
  line-height:1.06;
  letter-spacing:.14em;
  color:var(--paper);
}
.rail__sub{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.12em;
  color:rgba(246,241,231,.72);
  white-space:nowrap;
}
.rail__toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:7px 14px;
  border:1px solid rgba(246,241,231,.6);
  border-radius:999px;
  color:var(--paper);
  font-family:var(--sans);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  cursor:pointer;
  transition:background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.rail__toggle:hover{background:rgba(246,241,231,.16);}
.rail__toggle-box{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.rail__toggle-box span{
  display:block;height:2px;width:100%;
  background:currentColor;border-radius:2px;
  transition:transform 200ms var(--ease),opacity 200ms var(--ease);
}
.rail__toggle-text{line-height:1;}

.rail__nav{
  flex:1 1 auto;
  min-height:0;
  display:flex;
  flex-direction:column;
  padding-top:2px;
}
.nav-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  border-top:1px solid rgba(246,241,231,.24);
}
.nav-list__item{border-bottom:1px solid rgba(246,241,231,.18);}
.nav-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:11px 10px;
  border-radius:6px;
  text-decoration:none;
  color:rgba(246,241,231,.86);
  font-family:var(--sans);
  font-weight:700;
  font-size:15px;
  letter-spacing:.04em;
  transition:background-color 180ms var(--ease),color 180ms var(--ease),padding-left 180ms var(--ease);
}
.nav-link__num{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(246,241,231,.48);
  transition:color 180ms var(--ease);
}
.nav-link__label{line-height:1.3;}
.nav-link:hover,
.nav-link:focus-visible{background:rgba(20,16,15,.24);color:#FFFFFF;padding-left:14px;}
.nav-link:hover .nav-link__num,
.nav-link:focus-visible .nav-link__num{color:var(--gold);}
.nav-link[aria-current="page"]{
  background:var(--paper);
  color:var(--cinnabar-deep);
  box-shadow:inset 3px 0 0 var(--gold);
}
.nav-link[aria-current="page"] .nav-link__num{color:var(--gold-deep);}

.rail__ticker{
  margin-top:auto;
  padding-top:14px;
  border-top:1px solid rgba(246,241,231,.26);
  display:flex;
  flex-direction:column;
  gap:10px;
}
.rail__ticker-text{
  font-family:var(--mono);
  font-size:11px;
  line-height:1.65;
  letter-spacing:.03em;
  color:rgba(246,241,231,.72);
  max-width:100%;
}
.pill{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  align-self:flex-start;
  padding:8px 15px;
  border-radius:999px;
  border:1px solid currentColor;
  font-family:var(--sans);
  font-size:12px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  transition:background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease),transform 180ms var(--ease);
}
.pill--gold{
  color:var(--gold);
  border-color:rgba(201,154,75,.8);
  background:rgba(201,154,75,.14);
}
.pill--gold:hover,
.pill--gold:focus-visible{background:var(--gold);color:var(--ink);border-color:var(--gold);transform:translateY(-1px);}
.rail__scrim{display:none;}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 26px;
  border-radius:999px;
  border:1.5px solid transparent;
  font-family:var(--sans);
  font-weight:700;
  font-size:15px;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease),transform 180ms var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn--solid{background:var(--cinnabar);color:var(--paper);}
.btn--solid:hover{background:var(--cinnabar-deep);color:#FFFFFF;}
.btn--ink{background:var(--ink);color:var(--paper);}
.btn--ink:hover{background:var(--cinnabar);color:var(--paper);}
.btn--gold{background:var(--gold);color:var(--ink);}
.btn--gold:hover{background:var(--gold-deep);color:var(--paper);}
.btn--ghost{border-color:currentColor;background:transparent;color:var(--cinnabar-deep);}
.btn--ghost:hover{background:var(--cinnabar);border-color:var(--cinnabar);color:var(--paper);}

/* ---------- 布局容器 ---------- */
.shell{
  width:100%;
  max-width:calc(var(--shell) + 96px);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,48px);
}
.band{padding-block:clamp(44px,6.5vw,88px);}
.band--sand{background:var(--sand);}
.band--ink{background:var(--ink);color:rgba(246,241,231,.86);}
.band--ink h1,.band--ink h2,.band--ink h3{color:var(--paper);}
.band--ink .eyebrow{color:var(--gold);}
.band--ink .note{color:rgba(246,241,231,.72);border-bottom-color:rgba(201,154,75,.6);}
.band--cinnabar{background:var(--cinnabar);color:var(--paper);}
.band--cinnabar h1,.band--cinnabar h2,.band--cinnabar h3{color:var(--paper);}
.band--cinnabar .eyebrow{color:rgba(246,241,231,.78);}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 24px;
  margin-bottom:clamp(20px,3vw,34px);
  padding-bottom:14px;
  border-bottom:2px solid var(--ink);
  position:relative;
}
.section-head::after{
  content:"";
  position:absolute;
  left:0;bottom:-2px;
  width:64px;height:2px;
  background:var(--cinnabar);
}
.section-head h2{max-width:22em;}
.band--ink .section-head{border-bottom-color:rgba(246,241,231,.5);}

/* ---------- 栅格 ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,32px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.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-12{grid-column:span 12;}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-md);
  background:var(--sand);
  isolation:isolate;
}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(.82) contrast(1.03);
  transition:transform 460ms var(--ease);
}
.media:hover .media__img{transform:scale(1.03);}
.media--4x3{aspect-ratio:4/3;}
.media--16x9{aspect-ratio:16/9;}
.media--3x4{aspect-ratio:3/4;}
.media--1x1{aspect-ratio:1/1;}
.media--film::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(150deg,rgba(20,16,15,.22),rgba(178,58,46,.14) 55%,rgba(201,154,75,.12));
  mix-blend-mode:multiply;
}
.media__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:16px;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--paper);
  background:linear-gradient(transparent,rgba(20,16,15,.78));
}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:20px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--smoke);
}
.crumbs li{display:flex;align-items:center;gap:8px;}
.crumbs li+li::before{content:"/";color:rgba(20,16,15,.34);}
.crumbs__link{
  text-decoration:none;
  color:var(--cinnabar-deep);
  border-bottom:1px solid rgba(126,36,28,.38);
}
.crumbs__link:hover{border-bottom-color:var(--cinnabar);}
.crumbs__current{color:var(--smoke);}

/* ---------- 目录 / toc ---------- */
.toc{
  position:sticky;
  top:28px;
  align-self:start;
  font-family:var(--sans);
}
.toc__title{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--smoke);
  margin-bottom:12px;
}
.toc__list{
  display:flex;
  flex-direction:column;
  gap:2px;
  border-left:2px solid rgba(20,16,15,.14);
}
.toc__link{
  display:block;
  margin-left:-2px;
  padding:9px 12px;
  border-left:2px solid transparent;
  font-size:14px;
  font-weight:700;
  line-height:1.45;
  letter-spacing:.02em;
  text-decoration:none;
  color:var(--smoke);
  transition:color 180ms var(--ease),background-color 180ms var(--ease),border-color 180ms var(--ease);
}
.toc__link:hover{color:var(--ink);background:rgba(20,16,15,.05);}
.toc__link[aria-current="true"]{
  color:var(--cinnabar-deep);
  border-left-color:var(--cinnabar);
  background:rgba(178,58,46,.08);
}

/* ---------- 记录条 / 标签 ---------- */
.record{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 16px;
  padding:14px 2px;
  border-bottom:1px dashed rgba(20,16,15,.22);
}
.record__num{
  flex:none;
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.05em;
  color:var(--gold-deep);
}
.record__body{flex:1 1 12em;min-width:0;}
.record__meta{
  flex:none;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--smoke);
}
.band--ink .record{border-bottom-color:rgba(246,241,231,.24);}
.band--ink .record__num{color:var(--gold);}
.band--ink .record__meta{color:rgba(246,241,231,.6);}
.tag{
  display:inline-flex;
  align-items:center;
  padding:4px 11px;
  border-radius:999px;
  border:1px solid rgba(63,101,88,.34);
  background:rgba(63,101,88,.12);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--celadon);
}
.band--ink .tag{
  border-color:rgba(147,183,166,.5);
  background:rgba(79,122,106,.28);
  color:var(--celadon-on-ink);
}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:20px;
  bottom:22px;
  z-index:80;
  width:54px;height:54px;
  display:grid;place-items:center;
  border-radius:50%;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.04em;
  line-height:1.2;
  text-align:center;
  cursor:pointer;
  opacity:0;
  transform:translateY(12px);
  pointer-events:none;
  box-shadow:0 12px 26px rgba(20,16,15,.28);
  transition:opacity 200ms var(--ease),transform 200ms var(--ease),background-color 180ms var(--ease);
}
.to-top.is-visible{opacity:1;transform:none;pointer-events:auto;}
.to-top:hover{background:var(--cinnabar);}

/* ---------- 渐显 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(12px);}
.js [data-reveal].is-in{
  opacity:1;
  transform:none;
  transition:opacity 420ms var(--ease),transform 420ms var(--ease);
}
.js body.nav-open{overflow:hidden;}
body.nav-open{overflow:hidden;}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:rgba(246,241,231,.82);
  font-family:var(--sans);
}
.site-footer::before{
  content:"";
  display:block;
  height:6px;
  background:linear-gradient(90deg,var(--cinnabar) 0 42%,var(--gold) 42% 58%,var(--celadon-light) 58% 100%);
}
.footer__inner{
  max-width:calc(var(--shell) + 96px);
  margin-inline:auto;
  padding:clamp(42px,5.6vw,76px) clamp(18px,4vw,48px) 26px;
}
.footer__top{
  display:grid;
  grid-template-columns:minmax(0,5fr) minmax(0,7fr);
  gap:clamp(26px,4vw,56px);
  align-items:start;
}
.footer__eyebrow{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--gold);
  margin-bottom:14px;
}
.footer__callout-title{
  font-size:clamp(28px,3.4vw,46px);
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--paper);
}
.footer__callout-note{
  margin-top:16px;
  font-family:var(--serif);
  font-size:14px;
  line-height:1.85;
  color:rgba(246,241,231,.62);
  max-width:26em;
}
.footer__index-list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:0 26px;
}
.footer__index-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:11px 0;
  border-bottom:1px solid rgba(246,241,231,.14);
  text-decoration:none;
  font-size:15px;
  font-weight:700;
  letter-spacing:.03em;
  color:rgba(246,241,231,.88);
  transition:color 160ms var(--ease),padding-left 160ms var(--ease),border-color 160ms var(--ease);
}
.footer__index-link:hover,
.footer__index-link:focus-visible{color:var(--gold);padding-left:6px;border-bottom-color:rgba(201,154,75,.6);}
.footer__index-num{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(201,154,75,.9);
}
.footer__contact{
  margin-top:clamp(32px,4.4vw,54px);
  padding-top:26px;
  border-top:1px solid rgba(246,241,231,.16);
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:20px 28px;
}
.footer__contact-item{display:flex;flex-direction:column;gap:8px;min-width:0;}
.footer__contact-label{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--celadon-on-ink);
}
.footer__contact-value{
  font-family:var(--mono);
  font-size:15px;
  letter-spacing:.02em;
  line-height:1.6;
  color:var(--paper);
  word-break:break-word;
}
.footer__contact-value--text{font-family:var(--serif);font-size:15px;}
.footer__note{
  margin-top:22px;
  padding-left:14px;
  border-left:2px solid var(--gold);
  font-family:var(--serif);
  font-size:13px;
  line-height:1.85;
  color:rgba(246,241,231,.6);
  max-width:62ch;
}
.footer__legal{
  margin-top:clamp(28px,3.6vw,44px);
  padding-top:24px;
  border-top:1px solid rgba(246,241,231,.16);
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  justify-content:space-between;
  gap:18px 36px;
}
.footer__legal-text{
  max-width:52ch;
  font-family:var(--serif);
  font-size:13px;
  line-height:1.85;
  color:rgba(246,241,231,.6);
}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:10px;}
.footer__legal-link{
  display:inline-flex;
  align-items:center;
  padding:8px 16px;
  border:1px solid rgba(246,241,231,.32);
  border-radius:999px;
  text-decoration:none;
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  color:rgba(246,241,231,.9);
  transition:background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.footer__legal-link:hover,
.footer__legal-link:focus-visible{background:var(--gold);border-color:var(--gold);color:var(--ink);}
.footer__base{
  margin-top:26px;
  padding-top:18px;
  border-top:1px solid rgba(246,241,231,.16);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.04em;
  color:rgba(246,241,231,.55);
}
.footer__copy,.footer__icp{line-height:1.6;}

/* ---------- 响应式：平板 / 手机 ---------- */
@media (max-width:1024px){
  body{padding-left:0;padding-top:var(--rail-h);}

  .site-rail{
    inset:0 0 auto 0;
    width:100%;
    height:var(--rail-h);
    border-right:0;
    border-bottom:1px solid rgba(20,16,15,.34);
    background-image:linear-gradient(90deg,rgba(20,16,15,.22),rgba(20,16,15,0) 60%);
  }
  .rail__inner{
    flex-direction:row;
    align-items:center;
    gap:12px;
    height:var(--rail-h);
    padding:0 14px;
    overflow:visible;
  }
  .rail__brand{gap:10px;align-items:center;}
  .rail__seal{
    width:32px;height:32px;
    font-size:11px;
    border-width:1.5px;
    border-radius:5px;
    letter-spacing:.06em;
  }
  .rail__lockup{flex-direction:row;align-items:baseline;gap:9px;}
  .rail__name{
    writing-mode:horizontal-tb;
    font-size:16px;
    letter-spacing:.08em;
    line-height:1;
  }
  .rail__sub{font-size:10px;letter-spacing:.08em;color:rgba(246,241,231,.68);}
  .rail__toggle{display:inline-flex;}

  .rail__nav{
    position:fixed;
    top:var(--rail-h);
    left:0;
    bottom:0;
    width:240px;
    max-width:82vw;
    padding:18px 16px 20px;
    background-color:var(--cinnabar);
    background-image:linear-gradient(180deg,rgba(20,16,15,.24),rgba(20,16,15,0) 40%);
    box-shadow:14px 0 34px rgba(20,16,15,.34);
    transform:translateX(-100%);
    visibility:hidden;
    transition:transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
    overflow-y:auto;
    z-index:96;
    flex:none;
  }
  .site-rail[data-open] .rail__nav{
    transform:translateX(0);
    visibility:visible;
  }
  .nav-link{padding:13px 10px;font-size:15px;}

  .rail__scrim{
    display:none;
    position:fixed;
    inset:var(--rail-h) 0 0 0;
    background:rgba(20,16,15,.56);
    z-index:94;
  }
  .site-rail[data-open] .rail__scrim{display:block;}

  .site-rail[data-open] .rail__toggle{background:rgba(246,241,231,.18);}
  .site-rail[data-open] .rail__toggle-box span:nth-child(1){transform:translateY(5px) rotate(45deg);}
  .site-rail[data-open] .rail__toggle-box span:nth-child(2){opacity:0;}
  .site-rail[data-open] .rail__toggle-box span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

  .toc{position:static;top:auto;}
  .footer__top{grid-template-columns:1fr;}
  .footer__contact{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.8;}
  .rail__sub{display:none;}
  .footer__index-list{grid-template-columns:1fr;}
  .footer__contact{grid-template-columns:1fr;}
  .footer__legal{flex-direction:column;}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12;}
  .to-top{width:48px;height:48px;right:14px;bottom:16px;}
}

@media (max-width:400px){
  .rail__name{font-size:15px;letter-spacing:.04em;}
  .rail__toggle-text{display:none;}
  .rail__toggle{padding:8px 11px;}
}

/* ---------- 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;
    scroll-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1;transform:none;}
  .media:hover .media__img{transform:none;}
}