/* ============ 1. 重置 ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,canvas,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit}
main{display:block}

/* ============ 2. 设计变量 ============ */
:root{
  --ink:#0B1F19;
  --charcoal:#121512;
  --brown:#241C16;
  --cream:#F6EDDC;
  --cream-2:#E4D6BE;
  --lime:#B8FF3D;
  --lime-soft:#DFFF9A;
  --amber:#FF9F1C;
  --brick:#E4572E;
  --sage:#8FA79A;
  --white:#FFFDF6;

  --line:rgba(143,167,154,.26);
  --line-strong:rgba(143,167,154,.48);

  --font-display:"Oswald","Barlow Condensed","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Noto Sans SC",monospace;

  --shell:1320px;
  --gutter:clamp(18px,4vw,56px);
  --header-h:78px;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-sm:12px;
  --pill:999px;
  --shadow-board:0 26px 64px -34px rgba(0,0,0,.9);
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ============ 3. 基础排版 ============ */
body{
  background-color:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:clamp(15px,1.05vw,17px);
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.14;
  letter-spacing:-.004em;
  color:var(--white);
}
h1{font-size:clamp(2.05rem,4.6vw,3.5rem)}
h2{font-size:clamp(1.55rem,3vw,2.35rem)}
h3{font-size:clamp(1.18rem,1.9vw,1.5rem)}
h4{font-size:clamp(1.02rem,1.4vw,1.16rem)}
::selection{background:var(--lime);color:#0B1F19}
[id]{scroll-margin-top:calc(var(--header-h) + 20px)}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px);display:block}

.mono,
.data-figure{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--lime);
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--lime);border-radius:2px}
.section--paper .eyebrow{color:#5B7A2A}
.section--paper .eyebrow::before{background:#5B7A2A}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px;border-radius:6px}
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:300;
  background:var(--lime);color:#0B1F19;font-weight:700;font-size:.9rem;
  padding:10px 20px;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  text-decoration:none;transition:top .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:0}

/* ============ 4. 容器与分区 ============ */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:820px}
.section{position:relative;padding-block:clamp(46px,7vw,96px)}
.section--board{background:linear-gradient(180deg,var(--charcoal),#0E1713 68%,var(--ink))}
.section--board::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(143,167,154,.12) 0 1px,transparent 1px 88px);
}
.section--board>.container{position:relative;z-index:1}
.section--paper{background:var(--cream);color:var(--brown);border-block:1px solid var(--cream-2)}
.section--paper h2,.section--paper h3,.section--paper h4{color:var(--brown)}
.section--paper .section-lede{color:rgba(36,28,22,.72)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px 32px;margin-bottom:clamp(24px,4vw,44px);
}
.section-title{margin-top:10px}
.section-lede{max-width:36em;color:var(--sage);font-size:.98rem;line-height:1.8}
.divider-rule{height:2px;border:0;margin-block:clamp(28px,4vw,52px);background:linear-gradient(90deg,var(--lime),rgba(184,255,61,0) 62%)}
.skew-band{
  height:clamp(22px,4vw,54px);
  background:linear-gradient(90deg,rgba(184,255,61,.5),rgba(255,159,28,.32) 55%,rgba(143,167,154,.12));
  clip-path:polygon(0 42%,100% 0,100% 58%,0 100%);
}

/* ============ 5. 网格与 Bento ============ */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,24px)}
.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,1.7vw,20px)}
.bento__cell{
  grid-column:span 4;
  position:relative;overflow:hidden;
  padding:clamp(18px,2.2vw,28px);
  background:linear-gradient(165deg,rgba(18,21,18,.94),rgba(11,31,25,.94));
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  transition:border-color .22s var(--ease),transform .22s var(--ease);
}
.bento__cell--focus{grid-column:span 7}
.bento__cell--wide{grid-column:span 8}
.bento__cell--half{grid-column:span 6}
.bento__cell--tall{grid-row:span 2}
.bento__cell--card{background:var(--cream);border-color:var(--cream-2);color:var(--brown)}
.bento__cell--card h3,.bento__cell--card h4{color:var(--brown)}
.bento__cell--link:hover,.bento__cell--link:focus-visible{border-color:rgba(184,255,61,.6);transform:translateY(-3px)}

/* ============ 6. 面板与纸卡 ============ */
.board-panel{
  background:linear-gradient(160deg,rgba(18,21,18,.96),rgba(11,31,25,.96));
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:clamp(20px,3vw,36px);
  box-shadow:var(--shadow-board);
}
.paper-card{
  background:var(--cream);color:var(--brown);
  border:1px solid var(--cream-2);
  border-radius:var(--radius-md);
  padding:clamp(18px,2.4vw,30px);
  box-shadow:0 20px 44px -32px rgba(0,0,0,.9);
}
.paper-card h2,.paper-card h3,.paper-card h4{color:var(--brown)}

/* ============ 7. 标签与状态 ============ */
.tactic-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 13px 6px 11px;
  border-radius:2px var(--pill) var(--pill) 2px;
  background:rgba(184,255,61,.12);
  border:1px solid rgba(184,255,61,.5);
  color:var(--lime);
  font-size:.76rem;font-weight:600;letter-spacing:.08em;line-height:1.5;
}
.tactic-tag--amber{background:rgba(255,159,28,.14);border-color:rgba(255,159,28,.55);color:var(--amber)}
.tactic-tag--brick{background:rgba(228,87,46,.14);border-color:rgba(228,87,46,.55);color:#FF9678}
.tactic-tag--paper{background:rgba(36,28,22,.06);border-color:rgba(36,28,22,.35);color:var(--brown)}
.status-dot{
  display:inline-block;flex:0 0 auto;width:8px;height:8px;border-radius:50%;
  background:var(--amber);box-shadow:0 0 0 4px rgba(255,159,28,.18);
  animation:dot-pulse 2.6s var(--ease) infinite;
}
.status-dot--lime{background:var(--lime);box-shadow:0 0 0 4px rgba(184,255,61,.18)}
.status-dot--brick{background:var(--brick);box-shadow:0 0 0 4px rgba(228,87,46,.2)}
@keyframes dot-pulse{0%,100%{opacity:1}50%{opacity:.42}}
.data-figure{display:block;color:var(--lime);font-weight:600;font-size:clamp(1.6rem,3vw,2.4rem);line-height:1.05}

/* ============ 8. 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 22px;border-radius:var(--pill);
  border:1px solid transparent;text-decoration:none;
  font-size:.94rem;font-weight:600;letter-spacing:.05em;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--lime);color:#0B1F19;box-shadow:0 16px 34px -22px rgba(184,255,61,.95)}
.btn--primary:hover{background:var(--lime-soft);transform:translateY(-2px)}
.btn--ghost{background:rgba(184,255,61,.06);border-color:rgba(184,255,61,.55);color:var(--lime)}
.btn--ghost:hover{background:rgba(184,255,61,.16);transform:translateY(-2px)}
.btn--quiet{background:transparent;border-color:var(--line-strong);color:var(--cream)}
.btn--quiet:hover{border-color:var(--lime);color:var(--lime);transform:translateY(-2px)}

/* ============ 9. 面包屑与正文 ============ */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px 0;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;color:var(--sage);
}
.breadcrumb a{color:var(--sage);text-decoration:none;transition:color .18s var(--ease)}
.breadcrumb a:hover{color:var(--lime)}
.breadcrumb__sep{color:rgba(143,167,154,.55)}
.breadcrumb [aria-current="page"]{color:var(--cream)}
.prose{max-width:42em}
.prose p{margin-bottom:1.05em;color:rgba(246,237,220,.86)}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin-block:1.4em .6em}
.prose ul,.prose ol{display:grid;gap:8px;margin-bottom:1.05em;padding-left:1.15em}
.prose ul li{position:relative;color:rgba(246,237,220,.86)}
.prose ul li::before{content:"";position:absolute;left:-1.05em;top:.72em;width:6px;height:6px;border-radius:2px;background:rgba(184,255,61,.7)}
.prose ol{list-style:decimal;color:rgba(246,237,220,.86)}
.prose strong{color:var(--white);font-weight:600}
.section--paper .prose p,.section--paper .prose ul li,.section--paper .prose ol{color:rgba(36,28,22,.82)}
.section--paper .prose strong{color:var(--brown)}

/* ============ 10. 章节跟随目录 ============ */
.toc{
  position:sticky;top:calc(var(--header-h) + 20px);
  background:rgba(18,21,18,.86);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  padding:18px 16px;
}
.toc-title{
  margin:0 0 12px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--sage);
}
.toc-list{display:grid;gap:2px}
.toc-link{
  display:block;padding:8px 10px;border-radius:10px;
  border-left:2px solid transparent;
  color:rgba(246,237,220,.8);font-size:.9rem;text-decoration:none;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.toc-link:hover{color:var(--lime);background:rgba(184,255,61,.08)}
.toc-link[aria-current="true"]{
  color:var(--lime);font-weight:600;
  border-left-color:var(--lime);background:rgba(184,255,61,.1);
}

/* ============ 11. 图片容器基础规则 ============ */
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:
    repeating-linear-gradient(135deg,rgba(143,167,154,.1) 0 1px,transparent 1px 14px),
    linear-gradient(150deg,#16261F,#0B1F19);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--band{aspect-ratio:21/9}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;
  color:var(--sage);line-height:1.7;
}
.section--paper .media-caption{color:rgba(36,28,22,.65)}

/* ============ 12. 入场显现协议 ============ */
[data-reveal]{transition:opacity .52s var(--ease),transform .52s var(--ease)}
.has-js [data-reveal]{opacity:0;transform:translateY(16px)}
.has-js [data-reveal][data-revealed]{opacity:1;transform:none}

/* ============ 13. 页头 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  color:var(--white);
  background:linear-gradient(180deg,rgba(11,31,25,.99),rgba(11,31,25,.93));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.header-frame{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:15px var(--gutter);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  transition:padding-block .22s var(--ease);
}
.site-header[data-condensed] .header-frame{padding-block:9px}
.header-brand{display:flex;align-items:center;min-width:0}
.brand-mark{
  display:inline-flex;align-items:center;gap:14px;
  padding:6px 6px 6px 2px;border-radius:var(--radius-sm);
  text-decoration:none;color:inherit;
}
.brand-glyph{
  position:relative;display:block;flex:0 0 auto;
  width:36px;height:36px;
  border:2px solid var(--lime);
  border-radius:12px 12px 5px 12px;
  transform:rotate(-8deg);
  transition:transform .22s var(--ease),border-color .22s var(--ease);
}
.brand-glyph::after{
  content:"";position:absolute;top:-4px;right:-4px;
  width:8px;height:8px;border-radius:50%;
  background:var(--amber);box-shadow:0 0 0 3px rgba(255,159,28,.2);
}
.brand-glyph-core{
  position:absolute;inset:8px;border-radius:5px;
  background:var(--lime);
  box-shadow:0 0 0 4px rgba(184,255,61,.14);
}
.brand-mark:hover .brand-glyph{transform:rotate(0deg);border-color:var(--lime-soft)}
.brand-text{display:grid;gap:1px;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-size:1.32rem;font-weight:700;letter-spacing:.03em;line-height:1.1;
  color:var(--white);white-space:nowrap;
}
.brand-descriptor{
  font-family:var(--font-mono);
  font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--sage);line-height:1.4;white-space:nowrap;
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.site-header[data-condensed] .brand-descriptor{opacity:0;transform:translateY(-4px)}
.header-nav-zone{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px)}
.site-nav{display:block}
.nav-list{display:flex;align-items:center;gap:4px}
.nav-item{display:block}
.nav-link{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 14px;border-radius:var(--pill);
  border:1px solid transparent;
  color:rgba(246,237,220,.82);
  font-size:.92rem;font-weight:500;letter-spacing:.04em;
  text-decoration:none;white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--lime);background:rgba(184,255,61,.1);border-color:rgba(184,255,61,.4)}
.nav-link[aria-current="page"]{
  color:var(--lime);font-weight:600;
  background:rgba(184,255,61,.12);
  border-color:rgba(184,255,61,.55);
}
.nav-link[aria-current="page"]::after{
  content:"";width:5px;height:5px;border-radius:50%;background:var(--lime);
}
.cta-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:var(--pill);
  background:var(--lime);color:#0B1F19;
  font-size:.88rem;font-weight:700;letter-spacing:.06em;
  text-decoration:none;white-space:nowrap;
  box-shadow:0 14px 30px -18px rgba(184,255,61,.95);
  transition:background-color .18s var(--ease),transform .18s var(--ease);
}
.cta-tag::after{content:"›";font-family:var(--font-mono);font-size:1rem;line-height:1}
.cta-tag:hover{background:var(--lime-soft);transform:translateY(-2px)}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border-radius:14px;
  border:1px solid rgba(184,255,61,.45);
  background:rgba(184,255,61,.08);
  color:var(--cream);
}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars span{
  display:block;height:2px;border-radius:2px;background:var(--lime);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle-label{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
}
.site-header[data-open] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.header-rule{position:relative;height:2px;background:rgba(143,167,154,.16)}
.header-rule-fill{
  position:absolute;left:0;top:0;bottom:0;width:0;
  background:linear-gradient(90deg,var(--lime),var(--amber));
  transition:width .12s linear;
}

/* ============ 14. 页脚 ============ */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,9vw,120px);
  color:var(--cream-2);
  border-top:1px solid rgba(184,255,61,.35);
  background:
    radial-gradient(130% 120% at 86% -30%,rgba(184,255,61,.12),transparent 58%),
    linear-gradient(180deg,#101B16,var(--charcoal) 42%,#1B1410);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.6;
  background-image:repeating-linear-gradient(90deg,rgba(143,167,154,.14) 0 1px,transparent 1px 96px);
}
.site-footer::after{
  content:"";position:absolute;right:-70px;top:-90px;
  width:280px;height:280px;border-radius:50%;
  border:1px solid rgba(184,255,61,.18);pointer-events:none;
}
.footer-frame{
  position:relative;z-index:1;
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(40px,6vw,76px) var(--gutter) clamp(24px,3vw,36px);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr) minmax(0,1.15fr);
  gap:clamp(26px,4vw,60px);
}
.footer-brand-block{display:grid;gap:14px;align-content:start}
.footer-brand-line{
  font-family:var(--font-display);
  font-size:clamp(1.3rem,2.3vw,1.75rem);
  line-height:1.3;color:var(--white);letter-spacing:.01em;
}
.footer-brand-line strong{color:var(--lime);font-weight:700}
.footer-stamp{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--sage);
}
.footer-nav-title,.footer-contact-title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:.72rem;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--sage);
}
.footer-nav-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 16px}
.footer-nav-list a{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 0;text-decoration:none;
  color:rgba(246,237,220,.85);font-size:.94rem;
  transition:color .18s var(--ease);
}
.footer-nav-list a::before{
  content:"";width:6px;height:6px;border-radius:2px;
  background:rgba(184,255,61,.45);flex:0 0 auto;
  transition:background-color .18s var(--ease);
}
.footer-nav-list a:hover{color:var(--lime)}
.footer-nav-list a:hover::before{background:var(--lime)}
.footer-contact{display:grid;align-content:start}
.footer-contact-list{display:grid;gap:0}
.contact-item{
  display:grid;gap:3px;
  padding-bottom:12px;margin-bottom:12px;
  border-bottom:1px dashed rgba(143,167,154,.28);
}
.footer-contact-list .contact-item:last-child{padding-bottom:0;margin-bottom:0;border-bottom:0}
.contact-label{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--sage);
}
.contact-value{color:var(--white);font-size:.98rem;overflow-wrap:anywhere;line-height:1.6}
.contact-value--mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.contact-note{color:var(--sage);font-size:.82rem;line-height:1.72}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 26px;
  margin-top:clamp(28px,4vw,48px);padding-top:22px;
  border-top:1px solid rgba(143,167,154,.22);
}
.legal-list{display:flex;flex-wrap:wrap;gap:8px 20px}
.legal-list a{
  color:rgba(246,237,220,.8);font-size:.86rem;text-decoration:none;
  border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease);
}
.legal-list a:hover{color:var(--lime);border-bottom-color:rgba(184,255,61,.6)}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 22px;
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.05em;color:var(--sage);
}
.footer-icp,.footer-copy{margin:0}

/* ============ 15. 返回顶部 ============ */
.to-top{
  position:fixed;right:clamp(14px,3vw,34px);bottom:clamp(14px,3vw,34px);z-index:75;
  width:52px;height:52px;
  display:grid;place-items:center;
  border-radius:18px 18px 6px 18px;
  background:var(--charcoal);
  border:1px solid rgba(184,255,61,.5);
  color:var(--lime);
  font-family:var(--font-mono);font-size:1.15rem;line-height:1;
  box-shadow:var(--shadow-board);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s,background-color .18s var(--ease),color .18s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:#18271F;color:var(--lime-soft)}

/* ============ 16. 响应式 ============ */
@media (max-width:1120px){
  .nav-link{padding:8px 10px;font-size:.86rem;letter-spacing:.02em}
  .header-frame{gap:16px}
  .bento__cell{grid-column:span 6}
  .bento__cell--focus{grid-column:span 12}
}
@media (max-width:900px){
  :root{--header-h:66px}
  .header-frame{padding-block:11px;gap:12px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    padding:14px var(--gutter) 24px;
    background:linear-gradient(180deg,#0E241D,var(--charcoal));
    border-bottom:1px solid rgba(184,255,61,.35);
    box-shadow:var(--shadow-board);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .24s var(--ease),visibility .2s;
  }
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{
    width:100%;justify-content:space-between;
    padding:14px 16px;border-radius:14px;
    font-size:.98rem;
  }
  .nav-link[aria-current="page"]::after{width:7px;height:7px}
  .bento__cell,.bento__cell--wide,.bento__cell--half,.bento__cell--focus{grid-column:span 12}
  .bento__cell--tall{grid-row:auto}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .footer-top{grid-template-columns:1fr}
  .footer-nav-list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .toc{position:static}
}
@media (max-width:620px){
  body{font-size:15px}
  .brand-name{font-size:1.12rem}
  .brand-descriptor{display:none}
  .brand-glyph{width:32px;height:32px}
  .cta-tag{padding:9px 13px;font-size:.8rem}
  .footer-nav-list{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .to-top{width:46px;height:46px;border-radius:16px 16px 6px 16px}
  .section--paper{border-radius:0}
}
@media (max-width:400px){
  .nav-toggle-label{display:none}
  .cta-tag{font-size:.76rem;padding:8px 11px}
}

/* ============ 17. 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;
  }
  .status-dot{animation:none}
  .header-rule-fill{transition:none}
  [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
  .bento__cell--link:hover,.bento__cell--link:focus-visible,
  .btn:hover,.cta-tag:hover{transform:none}
}