:root{
  --carbon:#0B1220;
  --midnight:#16213E;
  --cream:#F3ECDD;
  --paper:#E4D9C4;
  --cyan:#35F2D6;
  --orange:#FF6A2B;
  --violet:#8A6BFF;
  --ink:#2A1F17;
  --grey:#8A93A6;
  --edge:#F7F9FF;
  --line-dark:rgba(247,249,255,.14);
  --line-light:rgba(42,31,23,.16);
  --shadow:0 2px 12px rgba(11,18,32,.35);
  --r:4px;
  --font-display:"Helvetica Neue","Arial Narrow",system-ui,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --pad:clamp(1.15rem,4vw,4.5rem);
  --measure:34em;
  --sticky-top:150px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--carbon);
  color:var(--edge);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.22;
  letter-spacing:-.01em;
  margin:0 0 .6em;
}
h1{font-size:clamp(2rem,5vw,2.75rem)}
h2{font-size:clamp(1.5rem,3.2vw,2rem)}
h3{font-size:clamp(1.15rem,2.2vw,1.5rem)}
h4{font-size:1.25rem}
h5{font-size:1rem}
p{margin:0 0 1.2em;line-height:1.75}
ul,ol{margin:0 0 1.2em;padding-left:1.2em}
li{margin:.25em 0}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--edge)}
img{max-width:100%;height:auto;display:block}
button{font:inherit;color:inherit}
hr{border:0;border-top:1px solid var(--line-dark);margin:2rem 0}
::selection{background:var(--cyan);color:var(--carbon)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}
.band--paper :focus-visible,.band--paper-alt :focus-visible{outline-color:var(--orange)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:500;letter-spacing:-.01em}
.num--lg{font-size:1.75rem}
.num--xl{font-size:clamp(2.25rem,6vw,4rem);line-height:1.05}
.container{width:100%;max-width:1360px;margin-inline:auto;padding-inline:var(--pad)}
.prose{max-width:var(--measure)}
.prose p,.prose li{max-width:var(--measure)}
.skip-link{
  position:absolute;top:-64px;left:var(--pad);z-index:200;
  background:var(--cyan);color:var(--carbon);
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;
  padding:.6rem .95rem;border-radius:2px;transition:top .2s ease;
}
.skip-link:focus{top:8px;color:var(--carbon)}

/* ---------- 章节基底 ---------- */
.band{position:relative;padding-block:clamp(3rem,7vw,6.5rem)}
.band--dark{
  background-color:var(--carbon);color:var(--edge);
  background-image:linear-gradient(rgba(53,242,214,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(53,242,214,.045) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
}
.band--ink{background-color:var(--midnight);color:var(--edge)}
.band--paper{
  background-color:var(--cream);color:var(--ink);
  background-image:radial-gradient(rgba(42,31,23,.06) 1px,transparent 1px);
  background-size:5px 5px;
}
.band--paper-alt{background-color:var(--paper);color:var(--ink)}
.band--cut{clip-path:polygon(0 2.6rem,100% 0,100% 100%,0 100%)}
.band--cut-b{clip-path:polygon(0 0,100% 0,100% calc(100% - 2.6rem),0 100%)}
.band--narrow{padding-inline:0}
.band--narrow > .container{max-width:960px}

.rule{position:relative;height:1px;background:var(--line-dark);overflow:hidden}
.rule__sweep{position:absolute;inset:0;background:var(--cyan);transform-origin:left}
.band--paper .rule,.band--paper-alt .rule{background:var(--line-light)}
.band--paper .rule__sweep,.band--paper-alt .rule__sweep{background:var(--orange)}

.sec-head{display:flex;align-items:flex-end;flex-wrap:wrap;gap:.5rem 1rem;margin-bottom:clamp(1.2rem,3vw,2.2rem)}
.sec-head__index{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.2em;color:var(--orange)}
.sec-head__title{font-family:var(--font-display);font-weight:700;font-size:clamp(1.35rem,2.8vw,2rem);margin:0;letter-spacing:-.01em}
.sec-head__sub{margin-left:auto;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--grey)}
.band--paper .sec-head__index{color:var(--ink)}

.summary{
  display:flex;flex-wrap:wrap;gap:clamp(1.2rem,4vw,3rem);
  padding-block:clamp(1.4rem,4vw,2.4rem);
  border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);
}
.band--paper .summary{border-color:var(--line-light)}
.summary__item{display:flex;flex-direction:column;gap:.15rem;min-width:7rem}
.summary__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(1.6rem,4vw,2.5rem);line-height:1.1;color:var(--cyan)}
.band--paper .summary__value,.band--paper-alt .summary__value{color:var(--ink)}
.summary__label{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--grey)}
.band--paper .summary__label{color:rgba(42,31,23,.6)}

.grid{display:grid;gap:clamp(1rem,2.5vw,2rem)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}
.col-start-3{grid-column-start:3}
.col-start-4{grid-column-start:4}
.col-start-7{grid-column-start:7}
.rail{
  grid-column:span 1;
  border-left:1px solid var(--line-dark);
  padding-left:.8rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;
  color:var(--grey);text-transform:uppercase;
}
.band--paper .rail{border-color:var(--line-light);color:rgba(42,31,23,.55)}

/* ---------- 展签标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4em;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
  padding:.26em .58em;border:1px solid currentColor;border-radius:2px;line-height:1.4;
}
.tag--index{color:var(--orange)}
.tag--dim{color:var(--cyan)}
.tag--source{color:var(--grey)}
.band--paper .tag--index,.band--paper-alt .tag--index{color:var(--ink);border-color:var(--orange)}
.band--paper .tag--dim,.band--paper-alt .tag--dim{color:var(--ink);border-color:var(--cyan)}
.band--paper .tag--source,.band--paper-alt .tag--source{color:rgba(42,31,23,.66);border-color:var(--line-light)}

/* ---------- 展签卡片 ---------- */
.panel{
  position:relative;
  background:var(--midnight);
  border:1px solid var(--line-dark);
  border-radius:var(--r);
  padding:clamp(1rem,2.2vw,1.6rem);
  box-shadow:var(--shadow);
  transition:border-color .2s ease,transform .2s ease;
}
.panel::after{
  content:"";position:absolute;top:-1px;right:-1px;width:14px;height:14px;
  border-top:1px solid var(--cyan);border-right:1px solid var(--cyan);
}
.panel:hover{border-color:var(--cyan);transform:translateY(-2px)}
.band--paper .panel,.band--paper-alt .panel{
  background:rgba(255,255,255,.5);
  border-color:var(--line-light);
  color:var(--ink);
  box-shadow:0 2px 12px rgba(42,31,23,.12);
}
.band--paper .panel:hover,.band--paper-alt .panel:hover{border-color:var(--orange)}
.panel__head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:.7rem}
.panel__title{font-family:var(--font-display);font-weight:700;font-size:1.08rem;margin:0;letter-spacing:0}
.panel__num{font-family:var(--font-mono);font-size:1.6rem;color:var(--cyan);flex:0 0 auto}
.band--paper .panel__num{color:var(--orange)}
.panel__body{font-size:.95rem;color:var(--grey);margin:0}
.band--paper .panel__body{color:rgba(42,31,23,.72)}
.panel__foot{margin-top:1rem;padding-top:.7rem;border-top:1px solid var(--line-dark);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--grey)}
.band--paper .panel__foot{border-color:var(--line-light);color:rgba(42,31,23,.6)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;
  padding:.7em 1.1em;border:1px solid var(--line-dark);border-radius:var(--r);
  background:transparent;color:var(--edge);cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{color:var(--edge)}
.btn--accent{border-color:var(--orange);color:var(--orange)}
.btn--accent:hover{background:var(--orange);color:var(--carbon);border-color:var(--orange)}
.btn--solid{background:var(--cyan);border-color:var(--cyan);color:var(--carbon)}
.btn--solid:hover{background:transparent;color:var(--cyan)}
.btn--ghost{border-color:var(--line-dark);color:var(--edge)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--small{padding:.45em .8em;font-size:.7rem}
.band--paper .btn,.band--paper-alt .btn{color:var(--ink)}
.band--paper .btn--accent,.band--paper-alt .btn--accent{color:var(--ink);border-color:var(--orange)}
.band--paper .btn--accent:hover,.band--paper-alt .btn--accent:hover{background:var(--orange);color:var(--cream)}
.band--paper .btn--ghost,.band--paper-alt .btn--ghost{border-color:var(--line-light)}
.band--paper .btn--ghost:hover,.band--paper-alt .btn--ghost:hover{border-color:var(--orange);color:var(--ink)}
.band--paper .btn--solid,.band--paper-alt .btn--solid{background:var(--ink);border-color:var(--ink);color:var(--cream)}

/* ---------- 面包屑 ---------- */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--grey);margin-bottom:1.4rem}
.crumbs__item{color:inherit}
.crumbs__item a{color:inherit;border-bottom:1px solid transparent}
.crumbs__item a:hover{color:var(--cyan);border-color:var(--cyan)}
.band--paper .crumbs__item a:hover,.band--paper-alt .crumbs__item a:hover{color:var(--ink);border-color:var(--orange)}
.crumbs__sep{opacity:.5}
.crumbs__sep::before{content:"/"}

/* ---------- 图片容器基础规则 ---------- */
.figure{margin:0;position:relative}
.figure__frame{
  position:relative;overflow:hidden;border:1px solid var(--line-dark);border-radius:var(--r);
  aspect-ratio:16/9;background:linear-gradient(160deg,var(--midnight),var(--carbon));
}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(200deg,rgba(53,242,214,.12),rgba(255,106,43,.16));
}
.figure__frame img,.figure__frame svg,.figure__frame video{width:100%;height:100%;object-fit:cover;display:block}
.figure--wide .figure__frame{aspect-ratio:21/9}
.figure--tall .figure__frame{aspect-ratio:4/5}
.figure--square .figure__frame{aspect-ratio:1/1}
.figure__frame--empty{background-image:repeating-linear-gradient(45deg,rgba(138,147,166,.12) 0 1px,transparent 1px 14px)}
.band--paper .figure__frame,.band--paper-alt .figure__frame{border-color:var(--line-light)}
.band--paper .figure__frame::after,.band--paper-alt .figure__frame::after{background:linear-gradient(200deg,rgba(53,242,214,.1),rgba(255,106,43,.14))}
.figure__caption{
  display:flex;flex-wrap:wrap;gap:.6em;align-items:baseline;
  margin-top:.7rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--grey);
}
.band--paper .figure__caption,.band--paper-alt .figure__caption{color:rgba(42,31,23,.62)}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line-dark);border-radius:var(--r);background:rgba(22,33,62,.45)}
.band--paper .table-wrap,.band--paper-alt .table-wrap{border-color:var(--line-light);background:rgba(255,255,255,.45)}
table.data{width:100%;border-collapse:collapse;font-size:.94rem;min-width:520px}
.data th{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  text-align:left;white-space:nowrap;padding:.7rem .9rem;
  background:var(--midnight);color:var(--cyan);border-bottom:1px solid var(--line-dark);
}
.data td{padding:.68rem .9rem;border-bottom:1px solid var(--line-dark);font-variant-numeric:tabular-nums}
.data tbody tr:nth-child(even){background:rgba(247,249,255,.03)}
.data tbody tr:hover{background:rgba(53,242,214,.06)}
.band--paper .data th,.band--paper-alt .data th{background:var(--paper);color:var(--ink);border-color:var(--line-light)}
.band--paper .data td,.band--paper-alt .data td{border-color:var(--line-light)}
.band--paper .data tbody tr:nth-child(even),.band--paper-alt .data tbody tr:nth-child(even){background:rgba(42,31,23,.05)}
.band--paper .data tbody tr:hover,.band--paper-alt .data tbody tr:hover{background:rgba(255,106,43,.1)}
.data .sticky-col{position:sticky;left:0;background:var(--midnight);z-index:1}
.band--paper .data .sticky-col,.band--paper-alt .data .sticky-col{background:var(--paper)}

/* ---------- 章节目录 ---------- */
.toc{position:sticky;top:var(--sticky-top);display:flex;flex-direction:column;gap:.1rem}
.toc__title{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--grey);margin-bottom:.6rem}
.toc__link{
  display:block;padding:.34rem 0 .34rem .85rem;border-left:1px solid var(--line-dark);
  font-size:.86rem;color:var(--grey);transition:color .2s ease,border-color .2s ease;
}
.toc__link:hover{color:var(--edge)}
.toc__link[aria-current="true"]{color:var(--cyan);border-color:var(--cyan)}
.band--paper .toc__link{border-color:var(--line-light);color:rgba(42,31,23,.6)}
.band--paper .toc__link[aria-current="true"]{color:var(--ink);border-color:var(--orange)}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(11,18,32,.95);
  color:var(--edge);
  border-bottom:1px solid var(--line-dark);
  backdrop-filter:blur(10px);
}
.site-header__bar{position:relative;border-bottom:1px solid var(--line-dark)}
.site-header__inner{display:flex;align-items:center;gap:clamp(.7rem,2vw,1.6rem);min-height:74px}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--edge);text-decoration:none;flex:0 0 auto}
.brand:hover{color:var(--cyan)}
.brand__mark{position:relative;width:26px;height:26px;flex:0 0 auto;border:1px solid var(--cyan);border-radius:2px;display:block}
.brand__axis{position:absolute;left:0;right:0;top:50%;height:1px;background:var(--orange)}
.brand__tick{position:absolute;top:0;bottom:0;left:50%;width:1px;background:var(--cyan)}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__name{font-family:var(--font-display);font-weight:700;font-size:1.05rem;letter-spacing:.04em}
.brand__meta{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;color:var(--grey)}
.rule-line{
  flex:1 1 auto;min-width:1.5rem;height:12px;align-self:center;
  border-bottom:1px solid var(--line-dark);
  background-image:repeating-linear-gradient(90deg,var(--line-dark) 0 1px,transparent 1px 14px);
}
.nav{flex:0 1 auto}
.nav__list{display:flex;align-items:center;gap:clamp(.5rem,1.5vw,1.35rem);list-style:none;margin:0;padding:0}
.nav__item{margin:0}
.nav__link{
  position:relative;display:inline-block;padding:.35rem .1rem;
  font-size:.92rem;color:var(--edge);opacity:.82;text-decoration:none;
  transition:color .18s ease,opacity .18s ease;
}
.nav__link:hover{color:var(--cyan);opacity:1}
.nav__link[aria-current="page"]{color:var(--cyan);opacity:1}
.nav__link[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;background:var(--cyan)}
.header__cta{flex:0 0 auto}
.nav-toggle{
  display:none;align-items:center;gap:.55rem;flex:0 0 auto;
  background:transparent;border:1px solid var(--line-dark);border-radius:2px;
  color:var(--edge);font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;
  padding:.5rem .7rem;cursor:pointer;transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:1px;background:currentColor;transition:opacity .2s ease}
.site-header[data-open="true"] .nav-toggle{border-color:var(--cyan);color:var(--cyan)}
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(2){opacity:.3}

.segbar{background:linear-gradient(180deg,rgba(22,33,62,.92),rgba(11,18,32,.92));border-bottom:1px solid var(--line-dark)}
.segbar__inner{display:flex;align-items:center;gap:1rem;min-height:48px}
.segbar__label{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--grey);white-space:nowrap}
.segbar__list{display:flex;align-items:center;gap:.35rem;list-style:none;margin:0;padding:0;overflow-x:auto;scrollbar-width:thin}
.segbar__list::-webkit-scrollbar{height:3px}
.segbar__list::-webkit-scrollbar-thumb{background:var(--line-dark)}
.seg{
  display:inline-flex;align-items:baseline;gap:.45em;white-space:nowrap;
  background:transparent;border:1px solid transparent;border-radius:2px;
  color:var(--grey);font-family:var(--font-body);font-size:.84rem;
  padding:.35rem .62rem;cursor:pointer;
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.seg:hover{color:var(--edge);border-color:var(--line-dark)}
.seg.is-active,.seg[aria-pressed="true"]{color:var(--cyan);border-color:var(--cyan);background:rgba(53,242,214,.07)}
.seg__num{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em}
.seg__name{font-size:.84rem}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.scroll-progress__bar{display:block;height:100%;width:100%;background:var(--cyan);transform:scaleX(0);transform-origin:left}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;color:var(--edge);background-color:var(--carbon);
  border-top:1px solid var(--line-dark);
  background-image:linear-gradient(rgba(138,147,166,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(138,147,166,.06) 1px,transparent 1px);
  background-size:48px 48px,48px 48px;
}
.site-footer__grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1.3fr;
  gap:clamp(1.4rem,3vw,2.6rem);
  padding-block:clamp(2.6rem,6vw,4.5rem);
}
.brand--footer{margin-bottom:.2rem}
.footer-brand__note{margin:.9rem 0 0;font-size:.92rem;color:var(--grey);max-width:24em;line-height:1.7}
.footer-brand__stamp{margin:1rem 0 0;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--cyan)}
.footer-col__title{
  font-family:var(--font-mono);font-size:.72rem;font-weight:500;letter-spacing:.16em;
  text-transform:uppercase;color:var(--grey);margin:0 0 .9rem;
}
.footer-col__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}
.footer-col__list li{margin:0}
.footer-col__list a{color:var(--edge);opacity:.82;font-size:.94rem;text-decoration:none;border-bottom:1px solid transparent;transition:color .2s ease,opacity .2s ease,border-color .2s ease}
.footer-col__list a:hover{color:var(--cyan);opacity:1;border-color:var(--cyan)}
.footer-contact__line{display:flex;flex-wrap:wrap;gap:.55rem;margin:0 0 .55rem;font-size:.88rem;line-height:1.6}
.footer-contact__label{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--grey);min-width:2.6em;padding-top:.15rem}
.footer-contact__value{color:var(--edge);opacity:.9;word-break:break-word}
.footer-contact__note{margin:.4rem 0 1rem;font-size:.82rem;color:var(--grey);line-height:1.7;max-width:22em}
.site-footer__legal{border-top:1px solid var(--line-dark);background:rgba(22,33,62,.55)}
.legal__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.6rem;
  padding-block:1rem;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--grey);
}
.site-footer .btn--ghost{border-color:var(--line-dark);color:var(--edge)}
.site-footer .btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:70;
  width:44px;height:44px;display:grid;place-items:center;
  border:1px solid var(--cyan);border-radius:2px;background:rgba(11,18,32,.86);
  color:var(--cyan);font-size:1rem;line-height:1;cursor:pointer;
  opacity:0;pointer-events:none;transition:opacity .25s ease,border-color .25s ease,color .25s ease;
}
.to-top[data-visible="true"]{opacity:1;pointer-events:auto}
.to-top:hover{background:var(--cyan);color:var(--carbon)}
.to-top--light{border-color:var(--orange);color:var(--orange)}
.to-top--light:hover{background:var(--orange);color:var(--cream)}

/* ---------- 显现 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(8px);transition:opacity .5s ease,transform .5s ease}
.js [data-reveal].is-in{opacity:1;transform:none}
.js [data-reveal] .rule__sweep{transform:scaleX(0);transition:transform .32s ease-out}
.js [data-reveal].is-in .rule__sweep{transform:scaleX(1)}

/* ---------- 平板 ---------- */
@media (max-width:1100px){
  :root{--sticky-top:120px}
  .site-header__inner{min-height:66px;gap:.7rem}
  .nav__list{gap:.8rem}
  .nav__link{font-size:.86rem}
  .site-footer__grid{grid-template-columns:1.4fr 1fr 1fr;row-gap:2.2rem}
  .footer-col--contact{grid-column:span 3}
  .span-3,.span-4{grid-column:span 6}
  .span-5,.span-7{grid-column:span 12}
  .span-8,.span-9{grid-column:span 12}
  .col-start-3,.col-start-4,.col-start-7{grid-column-start:auto}
}

/* ---------- 移动 ---------- */
@media (max-width:960px){
  .site-header__inner{min-height:62px}
  .brand__meta{font-size:.62rem}
  .rule-line{display:none}
  .brand{margin-right:auto}
  .nav{
    position:absolute;top:100%;left:0;right:0;z-index:90;
    display:none;background:var(--carbon);
    border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);
    box-shadow:var(--shadow);
    padding:.4rem var(--pad) 1rem;
    max-height:min(72vh,540px);overflow-y:auto;
  }
  .site-header[data-open="true"] .nav{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--line-dark)}
  .nav__item:last-child{border-bottom:0}
  .nav__link{display:block;padding:.85rem .2rem;font-size:1rem;opacity:1}
  .nav__link[aria-current="page"]::after{display:none}
  .nav__link[aria-current="page"]{padding-left:.8rem;border-left:2px solid var(--cyan)}
  .nav-toggle{display:inline-flex}
  .segbar__label{display:none}
  .segbar__inner{min-height:44px}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:span 1}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-6{grid-column:span 6}
  .span-4{grid-column:span 6}
  .rail{display:none}
  .site-footer__grid{grid-template-columns:1fr 1fr;gap:1.8rem 1.4rem}
  .footer-brand{grid-column:span 2}
  .footer-col--contact{grid-column:span 2}
  .sec-head__sub{margin-left:0;width:100%}
  .toc{position:static;margin-bottom:1.6rem}
}
@media (max-width:720px){
  .header__cta{display:none}
  .band{padding-block:clamp(2.4rem,9vw,3.6rem)}
  .summary{gap:1.4rem}
  .summary__item{min-width:6rem}
}
@media (max-width:640px){
  body{font-size:16px}
  .site-footer__grid{grid-template-columns:1fr}
  .footer-brand,.footer-col--contact{grid-column:span 1}
  .legal__inner{justify-content:flex-start}
  .grid--12{grid-template-columns:1fr}
  .span-6,.span-4{grid-column:span 1}
  .to-top{width:40px;height:40px}
}

/* ---------- 无障碍与动效降级 ---------- */
@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 !important;transform:none !important}
  .js [data-reveal] .rule__sweep{transform:scaleX(1) !important}
  .panel:hover{transform:none}
}