/* ============ 00 变量与主题 ============ */
:root{
  --ink:#061024;
  --ink-2:#0a1730;
  --teal:#04324A;
  --blue:#0A6CFF;
  --blue-soft:rgba(10,108,255,.22);
  --cyan:#00E5C3;
  --cyan-soft:rgba(0,229,195,.12);
  --red:#FF3B30;
  --orange:#FF8A3D;
  --amber:#FFC53D;
  --paper:#F4F7FC;
  --ice:#8FA6C8;
  --glass:rgba(255,255,255,.08);
  --glass-strong:rgba(255,255,255,.14);
  --line:rgba(143,166,200,.26);
  --line-strong:rgba(143,166,200,.5);
  --rail:88px;
  --header-h:96px;
  --shell:1560px;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ============ 01 Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
[id]{scroll-margin-top:calc(var(--header-h) + 18px)}

/* ============ 02 基底排版 ============ */
body{
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(143,166,200,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,166,200,.05) 1px,transparent 1px);
  background-size:80px 80px;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-weight:900;line-height:1.08;letter-spacing:-.01em;color:var(--paper)}
h1{font-size:clamp(40px,5vw,72px)}
h2{font-size:clamp(26px,2.6vw,38px)}
h3{font-size:clamp(19px,1.6vw,24px);font-weight:800}
h4{font-size:17px;font-weight:800;line-height:1.3}
strong{font-weight:800}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ============ 03 容器与章节 ============ */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(16px,2.2vw,34px)}
.shell--rail{padding-left:clamp(16px,2.2vw,34px)}
.rail-offset{padding-left:0}
.section{padding-block:clamp(40px,5vw,84px);border-top:1px solid var(--line)}
.section--flush{border-top:0;padding-top:0}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:14px 28px;margin-bottom:clamp(20px,2.4vw,36px)}
.section__title{font-size:clamp(26px,2.6vw,38px);font-weight:900;line-height:1.1}
.section__note{max-width:34em;font-size:14.5px;line-height:1.7;color:var(--ice)}
.divider{height:1px;background:var(--line)}
.stack{display:grid;gap:clamp(14px,1.8vw,26px)}

/* ============ 04 网格 ============ */
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--12>*{min-width:0}
.col-3{grid-column:span 3}
.col-5{grid-column:span 5}
.col-7{grid-column:span 7}
.col-12{grid-column:span 12}

/* ============ 05 文字组件 ============ */
.kicker{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--ice);
}
.kicker::before{content:"";width:16px;height:1px;background:var(--cyan);flex:none}
.lead{max-width:34em;font-size:clamp(17px,1.5vw,20px);line-height:1.7;color:rgba(244,247,252,.9)}
.prose{max-width:38em}
.prose p{margin-bottom:1.2em;color:rgba(244,247,252,.86)}
.prose h3{margin:1.8em 0 .7em}
.prose ul,.prose ol{margin:0 0 1.2em}
.prose li{position:relative;padding-left:1.5em;margin-bottom:.5em;color:rgba(244,247,252,.86)}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:9px;height:1px;background:var(--cyan)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.02em}
.num--lg{display:inline-block;font-size:clamp(36px,4.6vw,64px);line-height:1;color:var(--cyan)}
.num--xl{display:inline-block;font-size:clamp(48px,7vw,96px);line-height:1;color:var(--cyan)}
.num--tilt{transform:rotate(-4deg)}
.num--outline{color:transparent;-webkit-text-stroke:1px var(--cyan)}

/* ============ 06 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.72em 1.15em;border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:700;letter-spacing:.02em;line-height:1.2;
  white-space:nowrap;transition:transform 180ms var(--ease),background-color 180ms var(--ease),border-color 180ms var(--ease),color 180ms var(--ease);
}
.btn--cta{background:var(--orange);color:var(--ink);clip-path:polygon(0 0,100% 0,calc(100% - 8px) 100%,0 100%)}
.btn--cta:hover,.btn--cta:focus-visible{transform:translateX(4px)}
.btn--blue{background:var(--blue);color:#fff}
.btn--blue:hover,.btn--blue:focus-visible{transform:translateX(4px);background:#2a80ff}
.btn--ghost{background:var(--glass);border-color:var(--line);color:var(--paper)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan);transform:translateX(4px)}
.btn--sm{padding:.5em .85em;font-size:13px}

/* ============ 07 卡片 / 标签 / 筛选 ============ */
.card{
  position:relative;padding:clamp(18px,2vw,28px);
  background:var(--glass);border:1px solid var(--line);border-radius:3px;
  transition:border-color 200ms var(--ease),background-color 200ms var(--ease);
}
.card:hover{border-color:var(--blue)}
.card--solid{background:var(--teal);border-color:rgba(143,166,200,.34)}
.card--blue{background:linear-gradient(140deg,rgba(10,108,255,.92),rgba(10,108,255,.5));border-color:transparent}
.card__index{display:block;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--ice);margin-bottom:12px}
.card__title{font-size:clamp(18px,1.6vw,23px);font-weight:800;line-height:1.28}
.card__text{margin-top:10px;font-size:15px;line-height:1.7;color:rgba(244,247,252,.84)}
.card__foot{margin-top:18px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:.55em;
  padding:.48em .9em;border:1px solid var(--line);border-radius:2px;
  background:var(--glass);color:var(--paper);font-size:13.5px;font-weight:500;
  transition:border-color 200ms var(--ease),color 200ms var(--ease),background-color 200ms var(--ease);
}
.chip::before{content:"";width:7px;height:7px;flex:none;border-radius:50%;background:var(--ice);transition:background-color 200ms var(--ease),box-shadow 200ms var(--ease)}
.chip:hover{border-color:var(--line-strong)}
.chip[aria-pressed="true"]{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-soft)}
.chip[aria-pressed="true"]::before{background:var(--cyan);box-shadow:0 0 0 3px rgba(0,229,195,.18)}
.tag{
  display:inline-flex;align-items:center;gap:.4em;padding:3px 8px;border-radius:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  background:rgba(143,166,200,.16);color:var(--paper);
}
.tag--cyan{background:var(--cyan-soft);color:var(--cyan);border:1px solid rgba(0,229,195,.5)}
.tag--red{background:var(--red);color:#fff}
.tag--amber{background:var(--amber);color:var(--ink)}

/* ============ 08 折叠 / 复制 / 面包屑 / 数据块 / 图容器 ============ */
.fold{border:1px solid var(--line);border-radius:3px;background:var(--glass);transition:border-color 200ms var(--ease)}
.fold+.fold{margin-top:10px}
.fold:hover{border-color:var(--blue)}
.fold__summary{display:flex;align-items:center;gap:12px;padding:16px 18px;cursor:pointer;font-weight:700;font-size:16px;line-height:1.5;list-style:none}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"+";margin-left:auto;font-family:var(--font-mono);font-size:18px;color:var(--cyan);transition:transform 220ms var(--ease)}
.fold[open] .fold__summary::after{content:"–"}
.fold__body{padding:0 18px 18px;font-size:15px;line-height:1.75;color:rgba(244,247,252,.84)}
.copy-btn{
  display:inline-flex;align-items:center;gap:.4em;padding:.35em .7em;
  border:1px solid var(--line);border-radius:2px;background:var(--glass);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--ice);
  transition:border-color 180ms var(--ease),color 180ms var(--ease),background-color 180ms var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-btn[data-copied="true"]{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-soft)}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:20px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ice)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--line-strong)}
.breadcrumb__link{color:var(--ice)}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__current{color:var(--paper)}
.stat{display:grid;gap:6px}
.stat__num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700;font-size:clamp(30px,3.4vw,48px);line-height:1;color:var(--cyan)}
.stat__label{font-size:13px;letter-spacing:.06em;color:var(--ice)}
.figure{
  position:relative;display:block;overflow:hidden;border:1px solid var(--line);border-radius:3px;
  background:linear-gradient(150deg,var(--teal) 0%,var(--ink) 72%);
}
.figure::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:
    linear-gradient(rgba(143,166,200,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,166,200,.14) 1px,transparent 1px);
  background-size:34px 34px;
  pointer-events:none;
}
.figure__img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.figure--21x9{aspect-ratio:21/9}
.figure--16x9{aspect-ratio:16/9}
.figure--4x3{aspect-ratio:4/3}
.figure--1x1{aspect-ratio:1/1}
.figure__caption{display:block;margin-top:10px;font-size:13px;line-height:1.6;color:var(--ice)}

/* ============ 09 数据导航轨道 ============ */
.data-rail{
  position:fixed;left:0;top:var(--header-h);bottom:0;width:var(--rail);z-index:40;
  display:none;flex-direction:column;align-items:center;gap:16px;
  padding:24px 0 20px;
  background:linear-gradient(180deg,rgba(10,108,255,.22),rgba(4,50,74,.34) 46%,rgba(6,16,36,.5));
  border-right:1px solid var(--line);
}
.data-rail__label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:rgba(143,166,200,.85);writing-mode:vertical-rl}
.data-rail__stat{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:13px;letter-spacing:.06em;color:var(--cyan);writing-mode:vertical-rl}
.data-rail__link{
  display:grid;place-items:center;width:40px;height:40px;
  border:1px solid var(--line);color:var(--ice);
  font-family:var(--font-mono);font-size:12px;
  transition:border-color 200ms var(--ease),color 200ms var(--ease),background-color 200ms var(--ease);
}
.data-rail__link:hover{border-color:var(--blue);color:var(--paper)}
.data-rail__link[aria-current="true"]{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-soft)}
.data-rail__spark{width:1px;flex:1;min-height:24px;background:linear-gradient(180deg,var(--cyan),transparent);opacity:.45}

/* ============ 10 页头 ============ */
.skip-link{
  position:absolute;left:14px;top:10px;z-index:200;
  padding:10px 16px;border-radius:2px;background:var(--cyan);color:var(--ink);
  font-size:14px;font-weight:700;
  transform:translateY(-220%);
  transition:transform 180ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(6,16,36,.88);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header__inner{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(12px,1.6vw,26px);
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-right:clamp(14px,2vw,30px);
  min-height:var(--header-h);
}
.brand-rail{display:flex;align-items:center;width:100%;padding-left:clamp(14px,1.3vw,20px)}
.brand{display:flex;flex-direction:column;gap:8px}
.brand__mark{
  display:block;max-width:2.3em;word-break:break-all;
  font-size:19px;font-weight:900;line-height:1.05;letter-spacing:.01em;color:var(--paper);
}
.brand__meta{display:flex;flex-direction:column;gap:4px}
.brand__edition{
  align-self:flex-start;padding:1px 5px;border:1px solid rgba(0,229,195,.45);border-radius:2px;
  font-family:var(--font-mono);font-size:10px;line-height:1.5;letter-spacing:.1em;color:var(--cyan);
}
.brand__tagline{font-size:10px;letter-spacing:.06em;color:var(--ice);white-space:nowrap}
.site-nav{
  grid-column:2;
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;
  gap:clamp(10px,1.6vw,30px);min-width:0;
}
.site-nav__list{display:flex;align-items:center;gap:clamp(2px,.9vw,18px);min-width:0}
.site-nav__list--start{justify-self:start}
.site-nav__list--end{justify-self:end}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;display:inline-block;padding:8px 2px;
  font-size:15px;font-weight:500;letter-spacing:.02em;color:var(--paper);white-space:nowrap;
  transition:color 180ms var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:3px;height:1px;background:var(--cyan);
  transform:scaleX(0);transform-origin:left;transition:transform 180ms var(--ease);
}
.site-nav__link:hover{color:var(--cyan)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.header-ticker{
  display:flex;align-items:center;gap:clamp(8px,1.3vw,20px);
  min-width:0;overflow:hidden;white-space:nowrap;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ice);
}
.header-ticker__item{display:inline-flex;align-items:baseline;gap:.42em}
.header-ticker__num{font-size:15px;font-weight:700;color:var(--cyan);font-variant-numeric:tabular-nums}
.header-ticker__sep{display:inline-block;width:1px;height:13px;background:var(--line-strong);flex:none}
.header-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;position:relative;width:46px;height:46px;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  border:1px solid var(--line);border-radius:2px;background:var(--glass);
  transition:border-color 200ms var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bar{display:block;width:20px;height:2px;background:var(--paper);transition:transform 220ms var(--ease),opacity 220ms var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) 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(-7px) rotate(-45deg)}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;pointer-events:none}
.scroll-progress__bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform 120ms linear;
}

/* ============ 11 页脚 ============ */
.site-footer{
  position:relative;margin-top:clamp(48px,6vw,96px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,var(--ink) 0%,var(--teal) 58%,var(--ink) 100%);
  padding-block:clamp(36px,4.5vw,72px) clamp(22px,2.4vw,34px);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(143,166,200,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,166,200,.06) 1px,transparent 1px);
  background-size:80px 80px;
}
.site-footer__inner{position:relative;width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(16px,2.2vw,34px)}
.site-footer__top{
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1.7fr) minmax(0,1.35fr);
  gap:clamp(24px,3vw,56px);
}
.footer-brand__name{font-size:clamp(20px,2vw,27px);font-weight:900;line-height:1.2;letter-spacing:-.01em}
.footer-brand__slogan{margin-top:10px;max-width:22em;font-size:15px;line-height:1.7;color:rgba(244,247,252,.8)}
.footer-brand__meta{display:flex;flex-wrap:wrap;gap:10px 18px;margin-top:18px}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2vw,32px)}
.footer-nav__col{min-width:0}
.footer-nav__title{margin-bottom:14px;font-family:var(--font-mono);font-size:11.5px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--ice)}
.footer-nav__list{display:grid;gap:9px}
.footer-nav__link{
  position:relative;display:inline-block;padding-bottom:2px;
  font-size:15px;font-weight:500;color:var(--paper);
  transition:color 180ms var(--ease);
}
.footer-nav__link::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;background:var(--cyan);
  transform:scaleX(0);transform-origin:left;transition:transform 180ms var(--ease);
}
.footer-nav__link:hover,.footer-nav__link:focus-visible{color:var(--cyan)}
.footer-nav__link:hover::after,.footer-nav__link:focus-visible::after{transform:scaleX(1)}
.footer-contact{min-width:0}
.contact-list{display:grid;gap:12px}
.contact-list__row{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;
  padding-bottom:10px;border-bottom:1px solid var(--line);
}
.contact-list__row--wide{grid-template-columns:auto minmax(0,1fr)}
.contact-list__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ice);white-space:nowrap}
.contact-list__value{font-size:14.5px;line-height:1.6;color:var(--paper);word-break:break-all}
.site-footer__bottom{
  display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:14px 28px;
  margin-top:clamp(28px,3vw,48px);padding-top:20px;border-top:1px solid var(--line);
}
.footer-note{max-width:52em;font-size:13.5px;line-height:1.75;color:var(--ice)}
.footer-note__link{color:var(--cyan);border-bottom:1px solid rgba(0,229,195,.4)}
.footer-note__link:hover{color:var(--paper);border-bottom-color:var(--paper)}
.footer-legal{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--ice)}

/* ============ 12 断点：平板与手机 ============ */
@media (max-width:1119px){
  :root{--header-h:96px}
  .site-header__inner{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:
      "brand actions"
      "nav nav";
    align-items:center;
    gap:6px 12px;
    padding:10px clamp(14px,4vw,24px) 0;
    min-height:0;
  }
  .brand-rail{grid-area:brand;padding-left:0}
  .header-actions{grid-area:actions}
  .brand{flex-direction:row;align-items:baseline;gap:10px}
  .brand__mark{max-width:none;font-size:21px;letter-spacing:.02em}
  .brand__meta{flex-direction:row;align-items:center;gap:8px}
  .brand__tagline{font-size:11px;letter-spacing:.08em}
  .site-nav{
    grid-area:nav;grid-column:auto;
    display:flex;flex-direction:column;gap:0;
    padding-bottom:8px;
  }
  .site-nav__list{
    flex-direction:column;align-items:stretch;gap:0;
    border-top:1px solid var(--line);
  }
  .site-nav__item{display:block}
  .site-nav__link{display:block;padding:13px 2px;font-size:16px;border-bottom:1px solid var(--line)}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{padding-left:12px;border-left:2px solid var(--cyan)}
  .site-nav__list--start,.site-nav__list--end{justify-self:stretch}
  .header-ticker{
    order:-1;overflow-x:auto;overflow-y:hidden;padding:9px 0;
    border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    font-size:11px;scrollbar-width:none;-webkit-overflow-scrolling:touch;
  }
  .header-ticker::-webkit-scrollbar{display:none}
  .header-ticker__item{flex:none}
  .nav-toggle{display:inline-flex}
  .site-nav[data-ready="true"] .site-nav__list{
    max-height:0;visibility:hidden;overflow:hidden;
    transition:max-height 220ms var(--ease),visibility 0s linear 220ms;
  }
  .site-nav[data-ready="true"][data-open] .site-nav__list{
    max-height:60vh;visibility:visible;
    transition:max-height 220ms var(--ease),visibility 0s;
  }
  .site-footer__top{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:1023px){
  .grid--12{gap:18px}
  .col-3{grid-column:span 6}
  .col-5,.col-7{grid-column:span 12}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:720px){
  body{font-size:16px}
  .col-3{grid-column:span 12}
  .site-footer__top{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
  .site-footer__bottom{flex-direction:column}
  .footer-legal{white-space:normal}
  .brand__tagline{display:none}
}
@media (min-width:1120px){
  .data-rail{display:flex}
  .shell--rail{padding-left:calc(var(--rail) + clamp(16px,2.2vw,34px))}
  .rail-offset{padding-left:var(--rail)}
  .site-footer__inner{padding-left:calc(var(--rail) + clamp(16px,2.2vw,34px))}
}

/* ============ 13 动效降级 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
  .btn--cta:hover,.btn--cta:focus-visible,
  .btn--blue:hover,.btn--blue:focus-visible,
  .btn--ghost:hover,.btn--ghost:focus-visible{transform:none}
  .scroll-progress__bar{transition:none}
}