/* ==========================================================================
   诺亚赛场 · 共享样式 /assets/site.css
   纸张叠层 + 深空蓝夜场 + 等宽数字索引
   ========================================================================== */

:root{
  --ns-cream:#F4EDE2;
  --ns-cream-2:#E8DCCB;
  --ns-paper:#FBF6EE;
  --ns-edge:#C8B9A6;
  --ns-ink:#3B2A22;
  --ns-navy:#0B1B3A;
  --ns-navy-2:#12305F;
  --ns-navy-deep:#050C1C;
  --ns-orange:#FF6A1A;
  --ns-orange-2:#FFB347;
  --ns-violet:#6B3DF5;
  --ns-lime:#B6F24A;

  --ns-font-title:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",Georgia,serif;
  --ns-font-body:Inter,"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --ns-font-data:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ns-wrap:1240px;
  --ns-gutter:clamp(16px,4vw,40px);
  --ns-radius:2px;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}

body{
  margin:0;
  background-color:var(--ns-cream);
  background-image:repeating-linear-gradient(90deg,rgba(200,185,166,.28) 0 1px,transparent 1px 96px);
  color:var(--ns-ink);
  font-family:var(--ns-font-body);
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,svg,video{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
figure{margin:0}
hr{border:0;border-top:1px solid var(--ns-edge);margin:clamp(24px,3vw,40px) 0}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--ns-font-title);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-0.02em;
  color:var(--ns-navy);
}
h1{font-size:clamp(36px,4.6vw,64px)}
h2{font-size:clamp(24px,2.6vw,34px)}
h3{font-size:clamp(19px,1.7vw,23px)}

:focus-visible{outline:3px solid var(--ns-orange);outline-offset:3px;border-radius:1px}

.ns-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;
}
.ns-hidden{display:none!important}
.ns-num{font-family:var(--ns-font-data);font-variant-numeric:tabular-nums;letter-spacing:-0.01em}

/* ---------- 跳过链接 ---------- */
.ns-skip{
  position:absolute;left:14px;top:-80px;z-index:200;
  background:var(--ns-navy);color:var(--ns-cream);
  padding:10px 18px;font-size:14px;border-radius:var(--ns-radius);
  box-shadow:4px 4px 0 var(--ns-orange);
  transition:top .18s ease;
}
.ns-skip:focus{top:14px}

/* ---------- 容器 ---------- */
.ns-container{
  width:min(var(--ns-wrap),100% - (var(--ns-gutter) * 2));
  margin-inline:auto;
}

/* ---------- 顶栏 ---------- */
.ns-header{
  position:sticky;top:0;z-index:80;
  background:var(--ns-cream);
  border-bottom:1px solid var(--ns-ink);
  box-shadow:0 10px 24px -22px rgba(11,27,58,.9);
}
.ns-header__inner{
  display:flex;align-items:center;
  gap:clamp(14px,2.4vw,44px);
  min-height:76px;padding-block:10px;
}
.ns-header__lead{
  display:flex;align-items:center;gap:14px;
  margin-right:auto;min-width:0;
}

.ns-brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto}
.ns-brand__glyph{
  display:grid;place-items:center;
  width:40px;height:40px;
  background:var(--ns-navy);color:var(--ns-cream);
  font-family:var(--ns-font-data);font-weight:700;font-size:19px;line-height:1;
  box-shadow:4px 4px 0 var(--ns-orange);
  transform:rotate(-3deg);
}
.ns-brand__word{
  font-family:var(--ns-font-title);
  font-weight:800;font-size:22px;letter-spacing:-0.02em;
  color:var(--ns-navy);white-space:nowrap;
}
.ns-brand:hover .ns-brand__glyph{transform:rotate(0) translateY(-1px)}

.ns-tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 10px;
  background:var(--ns-cream-2);
  border:1px solid var(--ns-edge);
  border-radius:var(--ns-radius);
  font-family:var(--ns-font-data);
  font-size:11px;letter-spacing:.16em;line-height:1.2;
  color:var(--ns-ink);white-space:nowrap;
}
.ns-tag::before{
  content:"";width:7px;height:7px;background:var(--ns-lime);
  box-shadow:0 0 0 2px rgba(182,242,74,.3);
}

.ns-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:3px;
  overflow:hidden;pointer-events:none;
}
.ns-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--ns-orange),var(--ns-orange-2));
  transform:scaleX(0);transform-origin:0 50%;
}

/* ---------- 导航 ---------- */
.ns-nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,20px)}
.ns-nav__list{display:flex;align-items:center;gap:clamp(2px,.9vw,12px)}
.ns-nav__link{
  position:relative;display:inline-block;
  padding:9px 6px;font-size:15px;font-weight:500;color:var(--ns-navy);
  white-space:nowrap;transition:color .18s ease;
}
.ns-nav__link::after{
  content:"";position:absolute;left:6px;right:6px;bottom:3px;height:3px;
  background:var(--ns-orange);
  transform:scaleX(0);transform-origin:left;
  transition:transform .2s ease;
}
.ns-nav__link:hover::after,
.ns-nav__link:focus-visible::after{transform:scaleX(1)}
.ns-nav__link[aria-current="page"]{font-weight:700;color:var(--ns-navy)}
.ns-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- 按钮 ---------- */
.ns-cta,.ns-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:var(--ns-radius);
  border:1px solid var(--ns-navy);
  font-family:var(--ns-font-body);font-size:15px;font-weight:700;
  line-height:1.2;white-space:nowrap;
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease;
}
.ns-cta,.ns-btn--accent{
  background:var(--ns-orange);color:var(--ns-navy-deep);
  border-color:var(--ns-navy);
  box-shadow:4px 4px 0 var(--ns-navy);
}
.ns-cta:hover,.ns-btn--accent:hover{transform:translate(-1px,-2px);box-shadow:6px 7px 0 var(--ns-navy)}
.ns-btn{background:var(--ns-navy);color:var(--ns-cream);box-shadow:4px 4px 0 var(--ns-orange)}
.ns-btn:hover{transform:translate(-1px,-2px);box-shadow:6px 7px 0 var(--ns-orange)}
.ns-btn--ghost{background:transparent;color:var(--ns-navy);border-color:var(--ns-navy);box-shadow:none}
.ns-btn--ghost:hover{background:var(--ns-cream-2);box-shadow:none;transform:none}
.ns-zone--dark .ns-btn--ghost,
.ns-zone--navy .ns-btn--ghost{color:var(--ns-cream);border-color:var(--ns-cream)}
.ns-zone--dark .ns-btn--ghost:hover,
.ns-zone--navy .ns-btn--ghost:hover{background:rgba(244,237,226,.12)}

/* ---------- 汉堡按钮 ---------- */
.ns-burger{
  display:none;align-items:center;gap:9px;
  padding:8px 12px;
  border:1px solid var(--ns-navy);border-radius:var(--ns-radius);
  font-family:var(--ns-font-data);font-size:11px;letter-spacing:.16em;
  color:var(--ns-navy);background:transparent;
}
.ns-burger__bars{display:grid;gap:3px;width:16px}
.ns-burger__bars i{display:block;height:2px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
.ns-header[data-open] .ns-burger{background:var(--ns-navy);color:var(--ns-cream)}
.ns-header[data-open] .ns-burger__bars i:first-child{transform:translateY(5px) rotate(45deg)}
.ns-header[data-open] .ns-burger__bars i:nth-child(2){opacity:0}
.ns-header[data-open] .ns-burger__bars i:last-child{transform:translateY(-5px) rotate(-45deg)}

/* ---------- 分区节奏 ---------- */
.ns-zone{position:relative;padding-block:clamp(44px,6vw,88px)}
.ns-zone--paper{background:var(--ns-cream)}
.ns-zone--cream2{background:var(--ns-cream-2)}
.ns-zone--navy{background:var(--ns-navy);color:var(--ns-cream)}
.ns-zone--dark{background:var(--ns-navy-deep);color:var(--ns-cream)}
.ns-zone--diag{
  clip-path:polygon(0 4vw,100% 0,100% 100%,0 100%);
  padding-top:calc(clamp(44px,6vw,88px) + 3vw);
}
.ns-zone--navy h1,.ns-zone--navy h2,.ns-zone--navy h3,
.ns-zone--dark h1,.ns-zone--dark h2,.ns-zone--dark h3{color:var(--ns-cream)}
.ns-zone--navy .ns-chapter__num,.ns-zone--dark .ns-chapter__num,
.ns-zone--navy .ns-eyebrow,.ns-zone--dark .ns-eyebrow{color:var(--ns-orange)}

/* ---------- 章节索引骨架 ---------- */
.ns-shell{
  width:min(var(--ns-wrap),100% - (var(--ns-gutter) * 2));
  margin-inline:auto;
  display:grid;gap:clamp(20px,3vw,40px);
  grid-template-columns:minmax(0,1fr);
}
.ns-rail{display:none}
.ns-rail__label{
  display:block;margin-bottom:12px;
  font-family:var(--ns-font-data);font-size:10px;letter-spacing:.22em;
  color:var(--ns-edge);
}
.ns-rail__list{display:flex;flex-direction:column;gap:13px}
.ns-rail__link{
  display:flex;align-items:center;gap:9px;
  font-family:var(--ns-font-data);font-size:12px;letter-spacing:.1em;
  color:var(--ns-ink);opacity:.5;
  transition:opacity .2s ease,color .2s ease;
}
.ns-rail__link::before{
  content:"";flex:0 0 auto;width:14px;height:2px;background:currentColor;
  transition:width .2s ease,background-color .2s ease;
}
.ns-rail__link:hover{opacity:.85}
.ns-rail__link.is-active{opacity:1;color:var(--ns-navy);font-weight:700}
.ns-rail__link.is-active::before{width:26px;background:var(--ns-orange)}
.ns-rail__num{font-variant-numeric:tabular-nums}

/* ---------- 章节头 ---------- */
.ns-chapter{
  display:grid;gap:8px 26px;align-items:start;
  margin-bottom:clamp(22px,3vw,38px);
}
.ns-chapter__num{
  font-family:var(--ns-font-data);font-size:14px;font-weight:700;
  letter-spacing:.16em;color:var(--ns-navy);
}
.ns-chapter__title{font-size:clamp(24px,2.6vw,34px);margin:0}
.ns-chapter__note{
  margin:0;font-size:15px;line-height:1.65;color:var(--ns-ink);
  opacity:.78;max-width:62ch;
}
.ns-zone--navy .ns-chapter__note,
.ns-zone--dark .ns-chapter__note{color:var(--ns-cream);opacity:.82}

.ns-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--ns-font-data);font-size:12px;font-weight:700;
  letter-spacing:.2em;color:var(--ns-violet);
  margin-bottom:14px;
}
.ns-eyebrow::after{content:"";width:36px;height:2px;background:currentColor}

/* ---------- 栅格 ---------- */
.ns-grid{display:grid;gap:clamp(16px,2vw,26px)}
@media (min-width:720px){
  .ns-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ns-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ns-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .ns-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .ns-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
}

/* ---------- 纸张叠层卡片 ---------- */
.ns-card{
  position:relative;
  background:var(--ns-paper);
  border:1px solid var(--ns-ink);
  border-radius:var(--ns-radius);
  padding:clamp(18px,2vw,26px);
  box-shadow:7px 7px 0 var(--ns-cream-2);
  transition:transform .18s ease,box-shadow .18s ease;
}
.ns-card:hover{transform:translateY(-2px);box-shadow:9px 10px 0 var(--ns-cream-2)}
.ns-zone--navy .ns-card,
.ns-zone--dark .ns-card{
  background:rgba(244,237,226,.06);
  color:var(--ns-cream);
  box-shadow:7px 7px 0 rgba(255,106,26,.35);
}
.ns-zone--navy .ns-card:hover,
.ns-zone--dark .ns-card:hover{box-shadow:9px 10px 0 rgba(255,106,26,.5)}
.ns-zone--navy .ns-card__title,
.ns-zone--dark .ns-card__title{color:var(--ns-cream)}
.ns-card__label{
  display:inline-block;margin-bottom:12px;
  padding:4px 9px;
  background:var(--ns-navy);color:var(--ns-cream);
  font-family:var(--ns-font-data);font-size:11px;letter-spacing:.14em;
  border-radius:var(--ns-radius);
}
.ns-zone--navy .ns-card__label,
.ns-zone--dark .ns-card__label{background:var(--ns-orange);color:var(--ns-navy-deep)}
.ns-card__title{font-family:var(--ns-font-title);font-size:20px;margin:0 0 8px;color:var(--ns-navy)}
.ns-card__meta{
  display:flex;flex-wrap:wrap;gap:6px 14px;margin:0 0 10px;
  font-family:var(--ns-font-data);font-size:12px;letter-spacing:.08em;
  color:var(--ns-violet);
}
.ns-card__body{margin:0;font-size:15px;line-height:1.7}

/* ---------- 数据块 ---------- */
.ns-stat{
  display:flex;flex-direction:column;gap:5px;
  padding-left:15px;border-left:3px solid var(--ns-orange);
}
.ns-stat__value{
  font-family:var(--ns-font-data);font-weight:700;
  font-size:clamp(28px,3.4vw,46px);line-height:1;
  color:var(--ns-navy);font-variant-numeric:tabular-nums;
}
.ns-stat__label{font-size:13px;letter-spacing:.05em;color:var(--ns-ink);opacity:.75}
.ns-zone--navy .ns-stat__value,
.ns-zone--dark .ns-stat__value{color:var(--ns-lime)}
.ns-zone--navy .ns-stat__label,
.ns-zone--dark .ns-stat__label{color:var(--ns-cream);opacity:.82}

/* ---------- 筛选 chip ---------- */
.ns-chips{display:flex;flex-wrap:wrap;gap:9px}
.ns-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 14px;border-radius:999px;
  border:1px solid var(--ns-ink);background:transparent;
  font-family:var(--ns-font-data);font-size:12px;letter-spacing:.1em;
  color:var(--ns-ink);
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.ns-chip:hover{background:var(--ns-cream-2);border-color:var(--ns-navy)}
.ns-chip::before{content:"";width:6px;height:6px;background:var(--ns-edge);border-radius:50%}
.ns-chip[aria-pressed="true"]{background:var(--ns-navy);border-color:var(--ns-navy);color:var(--ns-cream)}
.ns-chip[aria-pressed="true"]::before{background:var(--ns-lime)}
.is-filtered-out{display:none!important}

/* ---------- 图片容器 ---------- */
.ns-media{position:relative;display:block}
.ns-media__frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--ns-ink);
  border-radius:var(--ns-radius);
  background:
    repeating-linear-gradient(135deg,rgba(244,237,226,.07) 0 10px,transparent 10px 22px),
    linear-gradient(135deg,var(--ns-navy) 0%,var(--ns-navy-deep) 62%,#1B1038 100%);
  box-shadow:7px 7px 0 var(--ns-cream-2);
}
.ns-media__frame img{width:100%;height:100%;object-fit:cover}
.ns-media--4x3 .ns-media__frame{aspect-ratio:4 / 3}
.ns-media--1x1 .ns-media__frame{aspect-ratio:1 / 1}
.ns-media--wide .ns-media__frame{aspect-ratio:21 / 9}
.ns-media__corner{
  position:absolute;left:12px;bottom:12px;
  padding:4px 9px;
  background:var(--ns-orange);color:var(--ns-navy-deep);
  font-family:var(--ns-font-data);font-size:11px;letter-spacing:.12em;
  border-radius:var(--ns-radius);
}
.ns-media__cap{
  display:block;margin-top:10px;
  font-size:13px;line-height:1.6;color:var(--ns-ink);opacity:.75;
}
.ns-zone--navy .ns-media__cap,
.ns-zone--dark .ns-media__cap{color:var(--ns-cream);opacity:.8}
.ns-zone--navy .ns-media__frame,
.ns-zone--dark .ns-media__frame{box-shadow:7px 7px 0 rgba(255,106,26,.3)}

/* ---------- 面包屑 ---------- */
.ns-breadcrumb{margin-bottom:clamp(16px,2vw,26px)}
.ns-breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.ns-breadcrumb li{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--ns-font-data);font-size:12px;letter-spacing:.08em;
  color:var(--ns-ink);opacity:.75;
}
.ns-breadcrumb li + li::before{content:"/";color:var(--ns-edge);opacity:1}
.ns-breadcrumb a{text-decoration:underline;text-decoration-color:var(--ns-orange);text-underline-offset:3px}
.ns-breadcrumb a:hover{color:var(--ns-navy)}

/* ---------- 正文排版 ---------- */
.ns-prose{max-width:72ch}
.ns-prose > p{font-size:17px}
.ns-prose h2{margin:1.5em 0 .55em}
.ns-prose h3{margin:1.4em 0 .5em}
.ns-prose ul,.ns-prose ol{margin:0 0 1.1em;padding-left:1.2em}
.ns-prose ul li{list-style:none;position:relative;padding-left:16px;margin-bottom:.5em}
.ns-prose ul li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:8px;height:2px;background:var(--ns-orange);
}
.ns-prose ol{list-style:decimal}
.ns-prose ol li{margin-bottom:.5em}
.ns-prose a{
  color:var(--ns-navy);font-weight:600;
  text-decoration:underline;text-decoration-color:var(--ns-orange);
  text-underline-offset:3px;text-decoration-thickness:2px;
}
.ns-prose a:hover{color:var(--ns-orange)}
.ns-zone--navy .ns-prose,
.ns-zone--dark .ns-prose{color:var(--ns-cream)}
.ns-zone--navy .ns-prose a,
.ns-zone--dark .ns-prose a{color:var(--ns-lime);text-decoration-color:var(--ns-orange)}

/* ---------- 返回顶部 ---------- */
.ns-totop{
  position:fixed;right:18px;bottom:18px;z-index:90;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  background:var(--ns-cream);color:var(--ns-navy);
  border:1px solid var(--ns-ink);border-radius:var(--ns-radius);
  box-shadow:5px 5px 0 var(--ns-orange);
  font-family:var(--ns-font-data);font-size:12px;letter-spacing:.12em;
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .2s ease,visibility .2s ease,transform .18s ease;
}
.ns-totop.is-on{opacity:1;visibility:visible;pointer-events:auto}
.ns-totop:hover{transform:translateY(-2px);background:var(--ns-orange);color:var(--ns-navy-deep)}

/* ---------- 页脚 ---------- */
.ns-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  padding-block:clamp(42px,5vw,76px) 26px;
  background:var(--ns-navy);
  color:var(--ns-cream);
}
.ns-footer__strip{
  position:absolute;left:0;right:0;top:0;height:6px;
  background:repeating-linear-gradient(90deg,var(--ns-orange) 0 22px,transparent 22px 36px);
}
.ns-footer__grid{
  display:grid;gap:clamp(26px,3vw,40px);
  grid-template-columns:minmax(0,1fr);
}
.ns-footer__title{
  margin:0 0 14px;
  font-family:var(--ns-font-data);font-size:12px;font-weight:700;
  letter-spacing:.2em;color:var(--ns-orange);
}
.ns-footer__list{display:grid;gap:9px}
.ns-footer__list a{
  font-size:15px;color:var(--ns-cream);opacity:.82;
  transition:opacity .18s ease,color .18s ease;
}
.ns-footer__list a:hover,
.ns-footer__list a:focus-visible{opacity:1;color:var(--ns-lime)}

.ns-footer__contact{display:grid;gap:14px}
.ns-footer__row{display:grid;gap:4px}
.ns-footer__key{
  font-family:var(--ns-font-data);font-size:11px;letter-spacing:.16em;
  color:var(--ns-orange-2);
}
.ns-footer__value{font-size:14px;line-height:1.65;color:var(--ns-cream);opacity:.86}

.ns-copy{
  display:inline-flex;align-items:center;justify-content:space-between;gap:10px;
  max-width:100%;padding:7px 11px;
  border:1px dashed rgba(244,237,226,.42);border-radius:var(--ns-radius);
  background:rgba(244,237,226,.06);
  text-align:left;
  transition:border-color .18s ease,background-color .18s ease;
}
.ns-copy:hover{border-color:var(--ns-lime);background:rgba(182,242,74,.1)}
.ns-copy__value{
  font-family:var(--ns-font-data);font-size:13px;color:var(--ns-cream);
  overflow-wrap:anywhere;
}
.ns-copy__hint{
  flex:0 0 auto;
  font-family:var(--ns-font-data);font-size:10px;letter-spacing:.14em;
  color:var(--ns-lime);
}
.ns-copy.is-copied{border-color:var(--ns-lime);background:rgba(182,242,74,.18)}

.ns-footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;
  margin-top:clamp(28px,4vw,48px);padding-top:20px;
  border-top:1px solid rgba(244,237,226,.22);
}
.ns-footer__sign{
  margin:0;
  font-family:var(--ns-font-title);font-size:17px;letter-spacing:.04em;
  color:var(--ns-cream);
}
.ns-footer__legal{
  display:flex;flex-wrap:wrap;gap:6px 20px;margin:0;
  font-family:var(--ns-font-data);font-size:12px;
  color:rgba(244,237,226,.72);
}
.ns-footer__icp{color:rgba(244,237,226,.72)}

/* ---------- 显现动效 ---------- */
.ns-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .24s ease-out,transform .24s ease-out;
}
.ns-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (max-width:1179.98px) and (min-width:960px){
  .ns-nav__link{font-size:14px;padding:8px 4px}
  .ns-header__lead .ns-tag{display:none}
}

@media (max-width:959.98px){
  .ns-burger{display:inline-flex}
  .ns-nav{
    position:absolute;left:0;right:0;top:100%;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    padding:12px var(--ns-gutter) 24px;
    max-height:80vh;overflow-y:auto;
    background:var(--ns-navy-deep);
    border-bottom:3px solid var(--ns-orange);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
  }
  .ns-header[data-open] .ns-nav{opacity:1;visibility:visible;transform:none}
  .ns-nav__list{display:grid;gap:0;width:100%}
  .ns-nav__link{
    display:block;padding:15px 2px;
    border-bottom:1px solid rgba(244,237,226,.16);
    color:var(--ns-cream);font-size:17px;
  }
  .ns-nav__link::after{display:none}
  .ns-nav__link[aria-current="page"]{color:var(--ns-lime);font-weight:700}
  .ns-nav__cta{margin-top:18px;width:100%;box-shadow:4px 4px 0 rgba(182,242,74,.75)}
  .ns-footer__bottom{flex-direction:column;align-items:flex-start}
}

@media (min-width:640px){
  .ns-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .ns-footer__grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .ns-chapter{grid-template-columns:132px minmax(0,1fr)}
  .ns-chapter__num{grid-column:1}
  .ns-chapter__title,.ns-chapter__note{grid-column:2}
  .ns-chapter__note{margin-top:-6px}
}
@media (min-width:1100px){
  .ns-shell{grid-template-columns:118px minmax(0,1fr);align-items:start}
  .ns-rail{display:block;position:sticky;top:104px;align-self:start}
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    transition-delay:0ms!important;
  }
  .ns-js [data-reveal]{opacity:1;transform:none}
  .ns-progress__bar{transition:none}
}