/* ============================================================
   pc-canada-28.com.cn — /assets/site.css
   共享外壳：变量 / 重置 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

:root{
  --navy:#0B1B33;
  --navy-2:#122A4A;
  --navy-3:#091729;
  --ink:#1B2430;
  --ice:#7FC4E8;
  --ice-soft:#C7E7F7;
  --maple:#D8262C;
  --maple-soft:#F2666B;
  --amber:#F5B31B;
  --green:#3F9B7A;
  --gray:#C9C6BE;
  --paper:#F4F6F8;

  --line:rgba(127,196,232,.20);
  --line-strong:rgba(127,196,232,.40);
  --shell:rgba(18,42,74,.88);
  --shadow:0 22px 46px -28px rgba(0,0,0,.92);
  --cut:14px;
  --container:1220px;
  --radius-pill:999px;

  --font-head:"Archivo Narrow","Oswald","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"HarmonyOS Sans SC","PingFang SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Roboto Mono","Courier New",monospace;
}

/* ---------- 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:130px;
}
body{
  margin:0;
  min-height:100vh;
  background:var(--navy);
  color:var(--ice-soft);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(58% 46% at 10% -6%, rgba(127,196,232,.16), transparent 70%),
    radial-gradient(44% 38% at 94% 6%, rgba(216,38,44,.12), transparent 72%);
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer;padding:0}
table{border-collapse:collapse;width:100%}

/* ---------- 中文排版 ---------- */
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.15;
  letter-spacing:-.012em;
  color:#fff;
}
h1{font-size:clamp(30px,5vw,58px)}
h2{font-size:clamp(24px,3.2vw,38px)}
h3{font-size:clamp(19px,2.2vw,25px)}
h4{font-size:17px;letter-spacing:0}
p{max-width:70ch}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.04em}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
:focus-visible{outline:2px solid var(--amber);outline-offset:2px;border-radius:5px}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:absolute;
  top:-120px;left:1rem;
  z-index:200;
  padding:.6rem 1.1rem;
  background:var(--amber);
  color:var(--ink);
  font-weight:700;
  font-size:14px;
  border-radius:0 0 10px 10px;
  transition:top .2s ease;
}
.skip-link:focus{top:0}

/* ============================================================
   头部
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
}

/* 通知位 */
.notice-bar{
  background:linear-gradient(90deg,#F5B31B 0%,#F2A20B 55%,#F5B31B 100%);
  color:var(--ink);
  font-size:13px;
  line-height:1.5;
  border-bottom:1px solid rgba(11,27,51,.28);
}
.notice-bar__inner{
  width:min(var(--container),100% - 1.6rem);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:.7rem;
  min-height:40px;
  padding:.2rem 0;
}
.notice-bar__label{
  flex:none;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  padding:.12rem .5rem;
  border:1px solid rgba(11,27,51,.5);
  border-radius:4px;
}
.notice-bar__viewport{
  flex:1 1 auto;
  min-width:0;
  overflow:hidden;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 26px,#000 calc(100% - 26px),transparent);
  mask-image:linear-gradient(90deg,transparent,#000 26px,#000 calc(100% - 26px),transparent);
}
.notice-bar__track{
  display:flex;
  width:max-content;
  animation:notice-roll 30s linear infinite;
}
.notice-bar__group{display:flex;flex:none}
.notice-bar__item{
  white-space:nowrap;
  padding-right:3rem;
  font-weight:500;
}
.notice-bar:hover .notice-bar__track,
.notice-bar:focus-within .notice-bar__track{animation-play-state:paused}
.notice-bar__more{
  flex:none;
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  font-size:13px;
  font-weight:700;
  padding:.2rem .75rem;
  border:1px solid rgba(11,27,51,.55);
  border-radius:var(--radius-pill);
  transition:background .2s ease,color .2s ease;
}
.notice-bar__more::after{content:"↗";font-size:12px}
.notice-bar__more:hover{background:var(--ink);color:var(--amber)}
@keyframes notice-roll{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* 悬浮胶囊导航 */
.nav-shell{
  padding:.55rem 0;
  background:linear-gradient(180deg,rgba(11,27,51,.94),rgba(11,27,51,.62));
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  transition:padding .25s ease;
}
.nav-shell__inner{
  position:relative;
  width:min(var(--container),100% - 1.6rem);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:1rem;
  padding:.45rem .55rem .45rem 1.05rem;
  background:var(--shell);
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  box-shadow:var(--shadow);
  transition:background .25s ease,padding .25s ease;
}
.site-header[data-condensed="true"] .nav-shell{padding:.28rem 0}
.site-header[data-condensed="true"] .nav-shell__inner{
  padding-top:.3rem;
  padding-bottom:.3rem;
  background:rgba(18,42,74,.74);
}
.site-header[data-condensed="true"] .brand__sub{opacity:0}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:.7rem;flex:none}
.brand__mark{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  padding:.26rem .55rem;
  border-radius:6px;
  background:var(--ice);
  color:var(--navy);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{
  font-family:var(--font-head);
  font-weight:800;
  font-size:17px;
  letter-spacing:.02em;
  color:#fff;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--ice);
  transition:opacity .25s ease;
}

/* 栏目 */
.site-nav{margin-inline-start:auto}
.site-nav__list{display:flex;align-items:center;gap:.15rem}
.site-nav__item{flex:none}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:.42rem;
  padding:.52rem .85rem;
  border-radius:var(--radius-pill);
  font-size:14.5px;
  font-weight:500;
  color:var(--ice-soft);
  transition:background .2s ease,color .2s ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible{background:rgba(127,196,232,.14);color:#fff}
.site-nav__link[aria-current="page"]{
  background:linear-gradient(135deg,rgba(216,38,44,.92),rgba(242,102,107,.78));
  color:#fff;
  font-weight:700;
}
.site-nav__code{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  color:var(--ice);
  opacity:.55;
  transition:opacity .2s ease;
}
.site-nav__link:hover .site-nav__code,
.site-nav__link:focus-visible .site-nav__code{opacity:1}
.site-nav__link[aria-current="page"] .site-nav__code{color:#fff;opacity:.9}

@media (min-width:1081px){
  .site-nav__link::after{
    content:attr(data-update);
    position:absolute;
    top:calc(100% + 12px);
    left:50%;
    transform:translate(-50%,-6px);
    white-space:nowrap;
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.06em;
    color:var(--ice-soft);
    background:var(--navy-2);
    border:1px solid var(--line);
    border-radius:6px;
    padding:.28rem .6rem;
    opacity:0;
    pointer-events:none;
    transition:opacity .18s ease,transform .18s ease;
    z-index:5;
  }
  .site-nav__link:hover::after,
  .site-nav__link:focus-visible::after{opacity:1;transform:translate(-50%,0)}
}

/* 移动端开合按钮 */
.nav-toggle{
  display:none;
  margin-inline-start:auto;
  align-items:center;
  gap:.5rem;
  padding:.5rem .85rem;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-pill);
  color:var(--ice-soft);
  font-size:13px;
  letter-spacing:.06em;
}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bar{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .22s ease,opacity .22s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__text{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em}

@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .nav-shell__inner{flex-wrap:wrap;border-radius:22px}
  .site-nav{
    order:3;
    flex:1 0 100%;
    margin:0;
    padding:.55rem;
    background:var(--navy-2);
    border:1px solid var(--line);
    border-radius:16px;
    box-shadow:var(--shadow);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    pointer-events:none;
    transition:opacity .22s ease,transform .22s ease,visibility .22s;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
    pointer-events:auto;
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:.1rem}
  .site-nav__link{
    justify-content:flex-start;
    padding:.72rem .9rem;
    border-radius:12px;
    font-size:15px;
  }
  .site-nav__code{opacity:.7}
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:4.5rem;
  background:linear-gradient(180deg,rgba(11,27,51,0) 0%,#081426 18%,#081426 100%);
  border-top:1px solid var(--line);
  color:var(--ice-soft);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:140px;
  pointer-events:none;
  opacity:.55;
  background:repeating-linear-gradient(115deg,rgba(127,196,232,.10) 0 1px,transparent 1px 15px);
}
.footer-grid{
  position:relative;
  width:min(var(--container),100% - 2rem);
  margin-inline:auto;
  display:grid;
  grid-template-columns:1.35fr 1fr 1fr 1.4fr;
  gap:2.2rem;
  padding:3.2rem 0 2.2rem;
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin-bottom:.95rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ice);
}
.footer-col__title::before{content:"";width:16px;height:1px;background:var(--maple)}
.footer-col__title + .footer-col__title{margin-top:1.6rem}

.footer-brand__head{display:flex;align-items:center;gap:.6rem;margin-bottom:.75rem}
.footer-brand__mark{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  padding:.24rem .55rem;
  border-radius:6px;
  background:var(--ice);
  color:var(--navy);
}
.footer-brand__name{
  font-family:var(--font-head);
  font-weight:800;
  font-size:19px;
  letter-spacing:.02em;
  color:#fff;
}
.footer-brand__note{
  font-size:14px;
  line-height:1.8;
  color:var(--gray);
  max-width:34ch;
  margin-bottom:1.2rem;
}
.footer-index{border-top:1px solid var(--line)}
.footer-index__row{
  display:flex;
  align-items:center;
  gap:.8rem;
  padding:.5rem 0;
  border-bottom:1px solid var(--line);
}
.footer-index__key{
  flex:none;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--maple-soft);
}
.footer-index__val{
  font-size:14px;
  color:var(--ice-soft);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-index__val:hover{color:var(--ice);border-bottom-color:var(--ice)}

.footer-nav__list{display:flex;flex-direction:column;gap:.42rem}
.footer-nav__link{
  display:inline-block;
  font-size:14.5px;
  color:var(--ice-soft);
  transition:color .2s ease,transform .2s ease;
}
.footer-nav__link:hover{color:var(--ice);transform:translateX(3px)}

.footer-legal__list{display:flex;flex-direction:column;gap:.42rem}
.footer-legal__link{
  display:inline-block;
  font-size:14.5px;
  color:var(--ice-soft);
  transition:color .2s ease,transform .2s ease;
}
.footer-legal__link:hover{color:var(--ice);transform:translateX(3px)}

.footer-icp{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--gray);
}

.footer-contact{display:flex;flex-direction:column;gap:.75rem}
.footer-contact__row{
  display:grid;
  grid-template-columns:52px minmax(0,1fr);
  gap:.6rem;
  font-size:14px;
  line-height:1.7;
}
.footer-contact__key{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--ice);
  padding-top:.16rem;
}
.footer-contact__val{color:var(--ice-soft);word-break:break-word}

.footer-bottom{
  position:relative;
  border-top:1px solid var(--line);
  background:rgba(9,23,41,.7);
}
.footer-bottom__inner{
  width:min(var(--container),100% - 2rem);
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.6rem 1.2rem;
  padding:1.15rem 0 1.4rem;
}
.footer-bottom__note{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--amber);
}
.footer-bottom__note::before{content:"●";font-size:9px;margin-right:.4rem;vertical-align:middle}
.footer-bottom__copy{font-size:13px;color:var(--gray);max-width:none}

/* 返回顶部 */
.back-to-top{
  position:fixed;
  right:1.2rem;
  bottom:1.2rem;
  z-index:70;
  padding:.7rem 1.05rem;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--ink);
  background:var(--amber);
  border-radius:0;
  clip-path:polygon(var(--cut) 0,100% 0,100% 100%,0 100%,0 var(--cut));
  box-shadow:0 14px 30px -16px rgba(0,0,0,.9);
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s;
}
.back-to-top[data-visible="true"]{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{background:#FFC63D}

/* ============================================================
   基础组件
   ============================================================ */
.container{width:min(var(--container),100% - 2rem);margin-inline:auto}

.scroll-progress{
  position:fixed;
  top:0;left:0;
  z-index:80;
  width:100%;
  height:3px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--ice),var(--maple));
  pointer-events:none;
}

.label{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ice);
}
.label--gray{color:var(--gray)}

.section{padding:3.2rem 0}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.6rem 1rem;
  margin-bottom:1.7rem;
}
.section__no{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--maple-soft);
}
.section__title{flex:1 1 260px}
.section__lead{max-width:58ch;color:var(--gray);font-size:15.5px;flex:1 1 100%}

.panel{
  position:relative;
  padding:1.35rem 1.5rem;
  background:var(--navy-2);
  border:1px solid var(--line);
  border-radius:6px;
}
.panel--cut{
  border:0;
  border-radius:0;
  padding:1.55rem 1.6rem;
  background:linear-gradient(160deg,#16325A 0%,#102542 68%,#0E2240 100%);
  clip-path:polygon(var(--cut) 0,100% 0,100% 100%,0 100%,0 var(--cut));
}
.panel--cut::before{
  content:"";
  position:absolute;
  top:var(--cut);
  left:0;
  width:calc(var(--cut) * 1.42);
  height:2px;
  background:var(--ice);
  transform:rotate(-45deg);
  transform-origin:left center;
}
.panel__title{
  font-family:var(--font-head);
  font-size:17px;
  font-weight:800;
  color:#fff;
  margin-bottom:.5rem;
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.72rem 1.35rem;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-size:14.5px;
  font-weight:600;
  line-height:1.2;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--maple);color:#fff}
.btn--primary:hover{background:var(--maple-soft)}
.btn--amber{background:var(--amber);color:var(--ink)}
.btn--amber:hover{background:#FFC63D}
.btn--ghost{
  border-color:var(--line-strong);
  background:rgba(127,196,232,.06);
  color:var(--ice-soft);
}
.btn--ghost:hover{border-color:var(--ice);color:#fff}
.btn--sm{padding:.45rem .9rem;font-size:13px}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.22rem .6rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ice);
  background:rgba(127,196,232,.08);
  border:1px solid var(--line-strong);
  border-radius:4px;
}
.tag--maple{background:rgba(216,38,44,.9);color:#fff;border-color:transparent}
.tag--amber{background:var(--amber);color:var(--ink);border-color:transparent}
.tag--green{background:var(--green);color:#0B1B33;border-color:transparent}

.ledger{border-top:1px solid var(--line)}
.ledger__row{
  display:grid;
  grid-template-columns:minmax(120px,200px) minmax(0,1fr);
  gap:.4rem 1.2rem;
  padding:.85rem 0;
  border-bottom:1px solid var(--line);
}
.ledger__key{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.05em;
  color:var(--ice);
}
.ledger__val{font-size:15px;color:var(--ice-soft)}

.prose{
  max-width:64ch;
  font-size:16.5px;
  line-height:1.85;
  color:var(--ice-soft);
}
.prose p + p{margin-top:1.05em}
.prose a{color:var(--ice);border-bottom:1px solid rgba(127,196,232,.45)}
.prose a:hover{color:#fff;border-bottom-color:var(--ice)}
.prose strong{color:#fff}
.prose h2,.prose h3{margin-top:1.8em;margin-bottom:.6em}

.paper-zone{
  background:var(--paper);
  color:var(--ink);
}
.paper-zone h1,.paper-zone h2,.paper-zone h3,.paper-zone h4{color:var(--ink)}
.paper-zone .prose{color:var(--ink)}
.paper-zone .prose a{color:#0F4C75;border-bottom-color:rgba(15,76,117,.4)}
.paper-zone .prose strong{color:var(--ink)}
.paper-zone .label{color:#0F4C75}

.crumbs{padding:.9rem 0 0;font-size:13px}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}
.crumbs__item{display:inline-flex;align-items:center;gap:.5rem}
.crumbs__link{color:var(--gray);transition:color .2s ease}
.crumbs__link:hover{color:var(--ice)}
.crumbs__sep{color:rgba(201,198,190,.5);font-family:var(--font-mono)}

.grid{display:grid;gap:1.3rem}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.stack > * + *{margin-top:1.1rem}

.split{
  display:grid;
  grid-template-columns:minmax(200px,238px) minmax(0,1fr);
  gap:2.4rem;
  align-items:start;
}

.rail{position:sticky;top:140px;align-self:start}
.rail__title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--ice);
}
.rail__list{
  display:flex;
  flex-direction:column;
  gap:.15rem;
  border-left:1px solid var(--line);
}
.rail__link{
  display:flex;
  align-items:baseline;
  gap:.6rem;
  margin-left:-1px;
  padding:.45rem .7rem .45rem .95rem;
  border-left:2px solid transparent;
  font-size:14px;
  color:var(--gray);
  transition:color .2s ease,background .2s ease,border-color .2s ease;
}
.rail__link:hover{color:var(--ice-soft)}
.rail__link.is-active{
  color:#fff;
  border-left-color:var(--maple);
  background:linear-gradient(90deg,rgba(216,38,44,.18),transparent);
}
.rail__no{font-family:var(--font-mono);font-size:11px;color:var(--ice)}
.rail__link.is-active .rail__no{color:var(--maple-soft)}

/* 图片容器基础规则 */
.figure{position:relative;margin:0;overflow:hidden;border:1px solid var(--line);background:linear-gradient(150deg,#16325A,#0E2240)}
.figure__frame{
  position:relative;
  display:block;
  width:100%;
  min-height:180px;
  overflow:hidden;
}
.figure__frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.7;
  background:
    repeating-linear-gradient(115deg,rgba(127,196,232,.10) 0 1px,transparent 1px 16px),
    radial-gradient(70% 60% at 80% 10%,rgba(216,38,44,.16),transparent 72%);
}
.figure__img,
.figure img,
.figure svg{display:block;width:100%;height:100%;object-fit:cover}
.figure--wide .figure__frame{aspect-ratio:16 / 9}
.figure--square .figure__frame{aspect-ratio:1 / 1}
.figure--tall .figure__frame{aspect-ratio:3 / 4}
.figure__cap{
  margin-top:.6rem;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--gray);
}

[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.22,.68,.32,1);
}
[data-reveal].is-visible{opacity:1;transform:none}

[data-drag-scroll]{cursor:grab;overflow-x:auto;scrollbar-width:thin}
[data-drag-scroll].is-dragging{cursor:grabbing;scroll-behavior:auto}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1.3fr 1fr;gap:2rem 2.4rem}
}
@media (max-width:960px){
  .split{grid-template-columns:minmax(0,1fr);gap:1.6rem}
  .rail{position:static}
  .rail__list{flex-direction:row;flex-wrap:wrap;border-left:0;gap:.4rem}
  .rail__link{
    margin-left:0;
    padding:.4rem .8rem;
    border-left:0;
    border:1px solid var(--line);
    border-radius:var(--radius-pill);
  }
  .rail__link.is-active{border-color:var(--maple);background:rgba(216,38,44,.16)}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  body{font-size:15.5px}
  .notice-bar__inner{gap:.5rem;min-height:36px}
  .notice-bar__label{display:none}
  .notice-bar__item{padding-right:2rem}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:1.7rem;padding:2.4rem 0 1.8rem}
  .ledger__row{grid-template-columns:minmax(0,1fr);gap:.2rem}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-bottom__inner{padding-right:4.5rem}
}
@media (max-width:420px){
  .brand__sub{display:none}
  .nav-toggle__text{display:none}
}

/* ============================================================
   可访问性与降级
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .notice-bar__track{animation:none;transform:none}
  .notice-bar__viewport{overflow-x:auto;-webkit-mask-image:none;mask-image:none}
  [data-reveal]{opacity:1;transform:none}
  .back-to-top{transition:none}
}