/* =========================================================
   南宫注册 · 共享样式表 /assets/site.css
   视觉原型：夜间战术分析室 —— 深墨蓝底 × 荧光青刻度 × 暖纸手册
   ========================================================= */

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote,fieldset{margin:0;padding:0;}
ul,ol{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%;}
:focus{outline:none;}

:root{
  color-scheme:dark;
  --ink:#0A1A2F;
  --ink-2:#14263D;
  --ink-3:#061220;
  --paper:#F4EFE4;
  --cyan:#35E0D6;
  --amber:#FFB733;
  --orange:#FF6B35;
  --green:#3FA76A;
  --brick:#C2453D;
  --muted:#7C8CA0;
  --line:#2A3B52;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --font-display:"Arial Narrow","Helvetica Neue",Helvetica,"PingFang SC","Microsoft YaHei",sans-serif;
  --wrap:1180px;
  --gutter:clamp(16px,4vw,44px);
  --frame-h:66px;
  --ease:cubic-bezier(.2,.72,.3,1);
}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}

html{scroll-behavior:smooth;scroll-padding-top:110px;}

body{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(42,59,82,.34) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,59,82,.34) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:0;
  left:var(--gutter);
  z-index:200;
  transform:translateY(-140%);
  padding:11px 20px;
  background:var(--cyan);
  color:#04121A;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 阅读进度条 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:120;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--amber) 62%,var(--orange) 100%);
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 框架式顶栏 ---------- */
.site-frame{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(10,26,47,.94);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.frame-inner{
  position:relative;
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--frame-h);
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(12px,2.6vw,40px);
}

.brand-block{
  display:flex;
  align-items:center;
  gap:14px;
  min-width:0;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.brand-mark{
  width:9px;
  height:24px;
  flex:0 0 auto;
  background:linear-gradient(180deg,var(--cyan) 0 48%,var(--orange) 48% 100%);
  box-shadow:0 0 14px rgba(53,224,214,.42);
}
.brand-name{
  font-family:var(--font-display);
  font-size:21px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--paper);
  white-space:nowrap;
}
.brand-tag{
  padding-left:14px;
  border-left:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
  white-space:nowrap;
}

/* ---------- 导航 ---------- */
.site-nav{
  grid-column:2;
  justify-self:center;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(6px,1.9vw,28px);
}
.nav-list a{
  position:relative;
  display:block;
  padding:8px 2px 12px;
  font-size:14px;
  letter-spacing:.05em;
  color:var(--muted);
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:6px;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .26s var(--ease);
}
.nav-list a:hover,
.nav-list a:focus-visible{color:var(--paper);}
.nav-list a:hover::after,
.nav-list a:focus-visible::after{transform:scaleX(1);}
.nav-list a[aria-current="page"]{color:var(--cyan);}
.nav-list a[aria-current="page"]::after{transform:scaleX(1);}

/* ---------- 顶栏状态标 ---------- */
.frame-meta{
  grid-column:3;
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding-left:14px;
  border-left:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--muted);
  white-space:nowrap;
}
.frame-meta .meta-value{
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--amber);
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{
  grid-column:3;
  justify-self:end;
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--paper);
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px;width:15px;}
.nav-toggle-bars i{
  display:block;
  height:1px;
  background:var(--cyan);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.site-frame[data-open="true"] .nav-toggle{border-color:var(--orange);background:rgba(255,107,53,.1);}
.site-frame[data-open="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(4px) rotate(45deg);}
.site-frame[data-open="true"] .nav-toggle-bars i:nth-child(2){opacity:0;}
.site-frame[data-open="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-4px) rotate(-45deg);}

/* ---------- 顶栏刻度尺 ---------- */
.tick-rail{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(20,38,61,.7),rgba(20,38,61,0));
}
.tick-rail-track{
  display:flex;
  align-items:flex-end;
  gap:2px;
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  height:20px;
  padding:0 var(--gutter) 6px;
  overflow:hidden;
}
.tick{
  flex:1 1 0;
  min-width:2px;
  max-width:16px;
  height:5px;
  border-radius:1px;
  background:var(--line);
}
.tick:nth-child(3n){height:8px;}
.tick:nth-child(6n){height:11px;background:#3A5170;}
.tick.is-active{
  flex:0 0 4px;
  max-width:4px;
  height:14px;
  background:var(--orange);
  box-shadow:0 0 12px rgba(255,107,53,.65);
}

/* ---------- 通用容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.wrap--narrow{max-width:860px;}
.wrap--wide{max-width:1320px;}

/* ---------- 章节 ---------- */
.section{
  position:relative;
  padding-block:clamp(52px,7vw,104px);
  border-top:1px solid var(--line);
}
.section:first-of-type{border-top:0;}
.section--paper{
  background:var(--paper);
  color:var(--ink);
  --line:#D9D0BE;
  --muted:#6E6455;
}
.section--paper .chapter-num,
.section--paper .eyebrow{color:#0E7C74;}
.section--paper .band-label{color:#9A6410;}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:12px 18px;
  margin-bottom:clamp(24px,3.4vw,44px);
}
.chapter-num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--cyan);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(24px,3.4vw,36px);
  font-weight:700;
  line-height:1.18;
  letter-spacing:-.01em;
}
.section-lede{
  flex:1 1 260px;
  min-width:0;
  font-size:15px;
  line-height:1.75;
  color:var(--muted);
  max-width:56ch;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
}
.lede{
  font-size:clamp(16px,1.6vw,18px);
  line-height:1.78;
  color:var(--muted);
  max-width:60ch;
}

/* ---------- 色带推进 ---------- */
.band{
  display:flex;
  align-items:center;
  gap:16px;
  padding-block:12px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.band-label{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--amber);
}
.band-line{flex:1 1 auto;height:1px;background:var(--line);}

/* ---------- 数据表达 ---------- */
.stat{display:flex;flex-direction:column;gap:8px;}
.stat-figure{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(48px,9vw,120px);
  line-height:.88;
  letter-spacing:-.04em;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}
.stat-figure--amber{color:var(--amber);}
.stat-figure--cyan{color:var(--cyan);}
.stat-figure--green{color:var(--green);}
.stat-figure--brick{color:var(--brick);}
.stat-label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--muted);
}
.num-xl{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(56px,10vw,140px);
  line-height:.86;
  letter-spacing:-.045em;
  font-variant-numeric:tabular-nums;
}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  padding:3px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
}
.tag--amber{color:var(--amber);border-color:rgba(255,183,51,.42);}
.tag--cyan{color:var(--cyan);border-color:rgba(53,224,214,.42);}
.tag--green{color:var(--green);border-color:rgba(63,167,106,.42);}
.tag--brick{color:var(--brick);border-color:rgba(194,69,61,.45);}

/* ---------- 按钮与链接 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  padding:.78em 1.4em;
  border:1px solid var(--line);
  background:var(--ink-2);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  text-transform:uppercase;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn:hover,.btn:focus-visible{border-color:var(--cyan);background:#1B3350;color:#FFFFFF;}
.btn--primary{
  border-color:var(--orange);
  background:var(--orange);
  color:#08111E;
  font-weight:700;
}
.btn--primary:hover,.btn--primary:focus-visible{
  border-color:#FF8A5C;
  background:#FF8A5C;
  color:#08111E;
}
.btn--ghost{background:transparent;}
.btn--ghost:hover,.btn--ghost:focus-visible{background:rgba(53,224,214,.1);}

.link-more{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--cyan);
  transition:border-color .18s var(--ease);
}
.link-more:hover,.link-more:focus-visible{border-bottom-color:var(--cyan);}

/* ---------- 面包屑 ---------- */
.crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}
.crumb a{color:var(--muted);transition:color .18s var(--ease);}
.crumb a:hover,.crumb a:focus-visible{color:var(--cyan);}
.crumb-sep{color:var(--line);}
.crumb [aria-current="page"]{color:var(--paper);}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(20px,3vw,36px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,1fr) minmax(0,1.45fr);}
.grid--rail{grid-template-columns:minmax(0,220px) minmax(0,1fr);}
.grid--baseline{align-items:baseline;}

/* ---------- 细线列表 ---------- */
.rule-list{border-top:1px solid var(--line);}
.rule-list > li{
  border-bottom:1px solid var(--line);
  padding-block:clamp(16px,2.2vw,26px);
}

/* ---------- 媒体容器（页面阶段放置图片） ---------- */
.media{display:block;}
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background:var(--ink-2);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.1) brightness(.92);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(53,224,214,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(53,224,214,.07) 1px,transparent 1px);
  background-size:34px 34px;
  pointer-events:none;
}
.media-frame--tall{aspect-ratio:4/5;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--wide{aspect-ratio:21/9;}
.media-cap{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--muted);
}

/* ---------- 可展开内容组 ---------- */
.disclosure{border-top:1px solid var(--line);}
.disclosure:last-of-type{border-bottom:1px solid var(--line);}
.disclosure-btn{
  width:100%;
  display:flex;
  align-items:center;
  gap:14px;
  padding:18px 2px;
  text-align:left;
  font-family:var(--font-body);
  font-size:16px;
  font-weight:600;
  line-height:1.5;
  color:var(--paper);
  transition:color .18s var(--ease);
}
.disclosure-btn:hover,.disclosure-btn:focus-visible{color:var(--cyan);}
.disclosure-idx{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--amber);
}
.disclosure-sign{
  position:relative;
  flex:0 0 auto;
  margin-left:auto;
  width:14px;
  height:14px;
}
.disclosure-sign::before,
.disclosure-sign::after{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:14px;
  height:1px;
  background:var(--cyan);
  transition:transform .22s var(--ease);
}
.disclosure-sign::after{transform:rotate(90deg);}
.disclosure.is-open .disclosure-sign::after{transform:rotate(0deg);}
.disclosure-panel{
  padding:0 2px 24px 38px;
  max-width:66ch;
  font-size:15.5px;
  line-height:1.78;
  color:var(--muted);
}
.disclosure-panel[hidden]{display:none;}
.disclosure-panel > * + *{margin-top:1em;}

/* ---------- 正文 ---------- */
.prose{
  max-width:38em;
  font-size:16.5px;
  line-height:1.78;
  color:inherit;
}
.prose > * + *{margin-top:1.1em;}
.prose h2{font-size:22px;font-weight:700;line-height:1.45;margin-top:1.9em;letter-spacing:-.01em;}
.prose h3{font-size:18px;font-weight:700;line-height:1.5;margin-top:1.6em;}
.prose ul{padding-left:0;}
.prose ul li{position:relative;padding-left:1.1em;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:7px;
  height:1px;
  background:var(--cyan);
}
.prose ol{list-style:decimal;padding-left:1.3em;}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(53,224,214,.35);}
.prose a:hover,.prose a:focus-visible{border-bottom-color:var(--cyan);}
.prose blockquote{
  border-left:2px solid var(--orange);
  padding-left:1.1em;
  color:var(--muted);
}
.prose strong{font-weight:700;color:var(--paper);}
.section--paper .prose strong{color:var(--ink);}
.section--paper .prose a{color:#0E7C74;border-bottom-color:rgba(14,124,116,.35);}
.section--paper .prose ul li::before{background:#0E7C74;}

/* ---------- 页脚 ---------- */
.site-foot{
  margin-top:auto;
  background:var(--ink-3);
  border-top:1px solid var(--line);
  color:var(--muted);
}
.foot-inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--gutter) clamp(28px,4vw,46px);
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.2fr;
  gap:clamp(24px,4vw,52px);
}
.foot-brand .brand{margin-bottom:16px;}
.foot-brand .brand-name{color:var(--paper);}
.foot-tagline{
  max-width:28ch;
  font-size:14px;
  line-height:1.72;
  color:var(--muted);
}
.foot-cover{
  margin-top:18px;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  line-height:1.9;
  color:#5D7591;
}
.foot-cover-num{font-size:14px;font-weight:700;color:var(--amber);}
.foot-title{
  margin-bottom:18px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
}
.foot-list li + li{margin-top:10px;}
.foot-list a{font-size:14px;color:var(--muted);transition:color .18s var(--ease);}
.foot-list a:hover,.foot-list a:focus-visible{color:var(--paper);}
.foot-contact dt{
  margin-bottom:4px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:#4E6480;
}
.foot-contact dd{
  margin-bottom:16px;
  font-size:14px;
  line-height:1.6;
  color:var(--paper);
  word-break:break-word;
}
.foot-contact dd:last-of-type{margin-bottom:0;}
.foot-note{
  margin-top:16px;
  font-size:12.5px;
  line-height:1.72;
  color:#5D7591;
}
.foot-base{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:18px var(--gutter) 26px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:#4E6480;
}
.foot-legal{color:#6C86A3;}

/* ---------- 进入视口显现 ---------- */
[data-reveal]{opacity:1;transform:none;}
html[data-js="on"] [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease-out,transform .55s cubic-bezier(.16,.84,.44,1);
}
html[data-js="on"] [data-reveal].is-revealed{opacity:1;transform:none;}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1180px){
  .brand-tag{display:none;}
}
@media (max-width:1000px){
  .foot-inner{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:880px){
  :root{--frame-h:58px;}
  .frame-inner{grid-template-columns:auto minmax(0,1fr) auto;padding-inline:var(--gutter);}
  .frame-meta{display:none;}
  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    padding:6px var(--gutter) 22px;
    background:var(--ink-2);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 48px rgba(3,9,17,.6);
  }
  .site-frame[data-open="true"] .site-nav{display:block;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-list li + li{border-top:1px solid var(--line);}
  .nav-list a{padding:15px 2px;font-size:15.5px;color:var(--paper);}
  .nav-list a::after{display:none;}
  .nav-list a[aria-current="page"]{color:var(--cyan);padding-left:16px;}
  .nav-list a[aria-current="page"]::before{
    content:"";
    position:absolute;
    left:0;
    top:50%;
    width:7px;
    height:7px;
    margin-top:-3.5px;
    background:var(--orange);
  }

  .grid--2,
  .grid--3,
  .grid--split,
  .grid--rail{grid-template-columns:1fr;}

  .section-lede{flex:1 1 100%;}
  .disclosure-panel{padding-left:2px;}
}
@media (max-width:600px){
  .foot-inner{grid-template-columns:1fr;gap:34px;}
  .foot-base{flex-direction:column;align-items:flex-start;}
  .tick-rail-track{height:18px;padding-bottom:5px;}
  .stat-figure{font-size:clamp(44px,16vw,72px);}
}

/* ---------- 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;
  }
  html[data-js="on"] [data-reveal]{opacity:1;transform:none;}
  .scroll-progress{transition:none;}
}