:root{
  --ink:#060A1B;
  --layer:#0D1530;
  --gold:#F2B74A;
  --violet:#7B5CFF;
  --ice:#D9F2FF;
  --text:#E6EAF5;
  --muted:#9AA6C4;
  --data:#4ED8C0;
  --rule:#22305A;
  --warn:#FF7A59;
  --wrap-w:1280px;
  --gutter:clamp(1rem,3vw,2.5rem);
  --radius:2px;
  --font-cn:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--ink);
  color:var(--text);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    radial-gradient(900px 520px at 78% -8%,rgba(123,92,255,.20),transparent 62%),
    radial-gradient(720px 430px at 6% 10%,rgba(242,183,74,.10),transparent 60%),
    radial-gradient(760px 640px at 52% 112%,rgba(78,216,192,.08),transparent 66%);
}
body::after{
  content:"";position:fixed;inset:-12%;z-index:-1;pointer-events:none;opacity:.55;
  background-image:
    radial-gradient(1.4px 1.4px at 20px 30px,rgba(217,242,255,.55),transparent),
    radial-gradient(1.1px 1.1px at 150px 112px,rgba(123,92,255,.5),transparent),
    radial-gradient(1.6px 1.6px at 262px 48px,rgba(242,183,74,.42),transparent),
    radial-gradient(1px 1px at 82px 192px,rgba(78,216,192,.42),transparent);
  background-size:320px 240px;
  animation:starDrift 42s linear infinite;
}
@keyframes starDrift{from{transform:translate3d(0,0,0)}to{transform:translate3d(-80px,-60px,0)}}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{list-style:none;margin:0;padding:0}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
[hidden]{display:none !important}
h1{font-size:clamp(2.1rem,5.4vw,3.5rem);font-weight:900;line-height:1.2;letter-spacing:-.01em;color:var(--ice)}
h2{font-size:clamp(1.6rem,3.4vw,2.25rem);font-weight:900;line-height:1.3;letter-spacing:-.01em}
h3{font-size:clamp(1.25rem,2.2vw,1.5rem);font-weight:900;line-height:1.4}
strong{color:var(--ice)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}
.mono-meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted)}
.wrap{width:100%;max-width:var(--wrap-w);margin-inline:auto;padding-inline:var(--gutter)}
.site-main{display:block;padding-block:clamp(1.5rem,4vw,3rem) 0}
.skip-link{
  position:absolute;left:1rem;top:-4rem;z-index:200;
  display:inline-block;padding:.6rem 1rem;
  background:var(--gold);color:#0A1030;font-weight:700;letter-spacing:.08em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.6rem}

/* ===== 头部 ===== */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(6,10,27,.84);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--rule);
}
.header-meta{
  overflow:hidden;max-height:3rem;opacity:1;
  border-bottom:1px dashed rgba(34,48,90,.9);
  transition:max-height .26s var(--ease),opacity .2s var(--ease),border-color .2s var(--ease);
}
.header-meta__inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:.45rem}
.header-meta__status{display:flex;align-items:center;color:var(--ice)}
.dot{width:6px;height:6px;border-radius:50%;background:var(--data);box-shadow:0 0 9px var(--data);margin-right:.5rem;flex:0 0 auto;animation:pulse 3.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.site-header[data-scrolled] .header-meta{max-height:0;opacity:0;border-color:transparent}
.masthead{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:1rem;
  padding-block:.85rem .7rem;
}
.masthead__brand{
  grid-column:2;justify-self:center;display:flex;align-items:center;gap:.85rem;padding-inline:.4rem;
}
.masthead__brand::before{
  content:"";width:3px;height:2.1rem;flex:0 0 auto;
  background:linear-gradient(180deg,var(--gold),var(--violet));
}
.masthead__cn{font-size:clamp(1.5rem,3vw,2rem);font-weight:900;letter-spacing:.07em;color:var(--ice)}
.masthead__meta{display:flex;flex-direction:column;line-height:1.25;border-left:1px solid var(--rule);padding-left:.75rem}
.masthead__region{font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--gold)}
.masthead__tagline{font-size:.75rem;letter-spacing:.1em;color:var(--muted)}
.masthead__aside{grid-column:3;justify-self:end;display:flex;align-items:center;gap:.6rem}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  min-height:40px;padding:.45rem 1.05rem;border:1px solid var(--rule);border-radius:var(--radius);
  font-size:.875rem;letter-spacing:.08em;color:var(--text);
  background:rgba(217,242,255,.03);cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{border-color:rgba(242,183,74,.55);color:var(--ice);background:rgba(242,183,74,.08)}
.btn--primary{
  background:linear-gradient(135deg,var(--gold),#F7D48C);color:#0A1030;
  border-color:transparent;font-weight:700;
  box-shadow:0 10px 26px -14px rgba(242,183,74,.9),inset 0 0 0 1px rgba(255,255,255,.18);
}
.btn--primary:hover{color:#0A1030;background:linear-gradient(135deg,#F7D48C,var(--gold));box-shadow:0 12px 30px -12px rgba(242,183,74,1)}
.btn--ghost{background:transparent;border-color:rgba(217,242,255,.28);color:var(--ice)}
.btn--ghost:hover{background:rgba(123,92,255,.16);border-color:var(--violet)}
.login-entry{white-space:nowrap}
.nav-toggle{
  grid-column:1;justify-self:start;display:none;align-items:center;gap:.5rem;
  padding:.45rem .7rem;border:1px solid var(--rule);border-radius:var(--radius);color:var(--ice);
}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bar{display:block;height:1.5px;width:100%;background:var(--gold)}
.nav-toggle__text{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em}
.site-nav{border-top:1px solid rgba(34,48,90,.7)}
.site-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:.15rem;padding-bottom:.35rem}
.site-nav__link{
  position:relative;display:block;padding:.5rem .95rem;
  font-size:.94rem;letter-spacing:.06em;color:var(--text);border-radius:var(--radius);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:.95rem;right:.95rem;bottom:.22rem;height:1px;
  background:linear-gradient(90deg,var(--gold),var(--violet));
  transform:scaleX(0);transform-origin:left;transition:transform .22s var(--ease);
}
.site-nav__link:hover{color:var(--gold)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--ice);font-weight:700;background:rgba(123,92,255,.12)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--gold),var(--violet) 55%,var(--data));
  transition:width .12s linear;
}

/* ===== 章节与正文 ===== */
.section{padding-block:clamp(1.75rem,4vw,3rem)}
.section__head{
  display:flex;flex-direction:column;gap:.55rem;
  border-top:1px solid var(--rule);padding-top:1rem;margin-bottom:1.5rem;
}
.section__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--data)}
.section__title{color:var(--ice)}
.section__lead{max-width:68ch;color:var(--muted);font-size:1rem}
.prose{max-width:68ch;font-size:1.0625rem;color:var(--text)}
.prose p{margin-bottom:1.2em}
.prose ul{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1.2em}
.prose li{position:relative;padding-left:1.1rem}
.prose li::before{content:"";position:absolute;left:0;top:.8em;width:6px;height:1px;background:var(--gold)}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.75rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.layout-rail{display:grid;grid-template-columns:minmax(0,180px) minmax(0,1fr) minmax(0,190px);gap:clamp(1.25rem,2.6vw,2.25rem);align-items:start}

/* ===== 通用组件 ===== */
.data-tag{
  display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.09em;
  color:var(--data);border:1px solid rgba(78,216,192,.34);background:rgba(78,216,192,.08);
  border-radius:var(--radius);padding:.12rem .5rem;
}
.panel{
  position:relative;border:1px solid var(--rule);border-radius:var(--radius);
  padding:clamp(1rem,2.2vw,1.6rem);
  background:linear-gradient(158deg,rgba(13,21,48,.94),rgba(6,10,27,.78));
}
.panel--glass{
  background:rgba(13,21,48,.55);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-color:rgba(123,92,255,.28);
}
.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);padding-block:.75rem 1.25rem}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}
.breadcrumb__item{display:flex;align-items:center;gap:.5rem}
.breadcrumb__item:not(:last-child)::after{content:"/";color:var(--rule)}
.breadcrumb__link:hover{color:var(--gold)}
.breadcrumb__item[aria-current="page"]{color:var(--ice)}
.tabs__list{display:flex;flex-wrap:wrap;gap:.2rem;border-bottom:1px solid var(--rule)}
.tabs__tab{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted);
  padding:.6rem .9rem;border:1px solid transparent;border-bottom:none;border-radius:2px 2px 0 0;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.tabs__tab:hover{color:var(--ice)}
.tabs__tab[aria-selected="true"]{color:var(--ice);background:rgba(123,92,255,.16);border-color:rgba(123,92,255,.42)}
.tabs__panel{padding-top:1.2rem;animation:panelIn .2s var(--ease) both}
@keyframes panelIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.chips{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
  padding:.32rem .7rem;border:1px solid var(--rule);border-radius:var(--radius);background:rgba(217,242,255,.02);
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.chip:hover{color:var(--ice);border-color:rgba(242,183,74,.5)}
.chip[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:#0A1030;font-weight:700}
.rail{position:sticky;top:9.5rem;border-left:1px solid var(--rule);padding-left:1rem}
.rail__list{display:flex;flex-direction:column;gap:.15rem}
.rail__link{
  position:relative;display:block;padding:.35rem 0;font-size:.85rem;color:var(--muted);
  transition:color .18s var(--ease);
}
.rail__link::before{content:"";position:absolute;left:-1rem;top:.85em;width:8px;height:1px;background:var(--rule)}
.rail__link:hover{color:var(--ice)}
.rail__link[data-active]{color:var(--gold)}
.rail__link[data-active]::before{background:var(--gold);width:14px}
.note-vertical{
  writing-mode:vertical-rl;font-family:var(--font-mono);font-size:12px;letter-spacing:.3em;
  color:var(--muted);text-transform:uppercase;
}
.img-frame{
  position:relative;overflow:hidden;border:1px solid var(--rule);border-radius:var(--radius);
  aspect-ratio:16/9;
  background:
    radial-gradient(120% 90% at 72% 0%,rgba(123,92,255,.30),transparent 60%),
    radial-gradient(90% 70% at 8% 100%,rgba(242,183,74,.16),transparent 62%),
    linear-gradient(180deg,#0B1230,#060A1B);
}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;
  background-image:
    linear-gradient(rgba(217,242,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(217,242,255,.06) 1px,transparent 1px);
  background-size:44px 44px;
}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--square{aspect-ratio:1/1}
.img-frame__img{width:100%;height:100%;object-fit:cover}
.img-frame__cap{
  position:absolute;left:0;right:0;bottom:0;padding:.55rem .8rem;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ice);
  background:linear-gradient(0deg,rgba(6,10,27,.92),transparent);
}
.starfield{position:relative;isolation:isolate}
.starfield::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:
    radial-gradient(1.4px 1.4px at 24px 32px,rgba(217,242,255,.7),transparent),
    radial-gradient(1.2px 1.2px at 148px 96px,rgba(123,92,255,.7),transparent),
    radial-gradient(1.6px 1.6px at 268px 44px,rgba(242,183,74,.6),transparent);
  background-size:320px 220px;
  animation:starDrift 45s linear infinite;
}
.orbit-rule{
  height:1px;width:100%;
  background:linear-gradient(90deg,transparent,rgba(123,92,255,.85),rgba(242,183,74,.85),transparent);
  transform-origin:left;animation:orbitDraw 2s linear both;
}
@keyframes orbitDraw{from{transform:scaleX(0)}to{transform:scaleX(1)}}
html[data-js="on"] .reveal{opacity:0;transform:translateY(10px)}
html[data-js="on"] .reveal.is-visible{opacity:1;transform:none;transition:opacity .55s var(--ease),transform .55s var(--ease)}

/* ===== 页脚 ===== */
.site-footer{
  position:relative;margin-top:clamp(3rem,7vw,5rem);
  border-top:1px solid var(--rule);
  background:linear-gradient(180deg,rgba(13,21,48,.86),rgba(6,10,27,1));
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--gold) 18%,var(--violet) 58%,transparent);
}
.footer-grid{
  display:grid;grid-template-columns:1fr;gap:clamp(1.5rem,3vw,2.5rem);
  padding-block:clamp(2rem,4vw,3rem);
}
.footer-brand__mark{display:flex;align-items:baseline;gap:.7rem}
.footer-brand__name{font-size:1.4rem;font-weight:900;letter-spacing:.14em;color:var(--ice)}
.footer-brand__region{font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--gold)}
.footer-brand__statement{max-width:34ch;margin-top:.8rem;font-size:.95rem;color:var(--muted)}
.footer-coord{margin-top:.9rem;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--data)}
.footer-col__title{
  margin-bottom:.85rem;font-family:var(--font-mono);font-size:12px;font-weight:400;
  letter-spacing:.22em;color:var(--gold);text-transform:uppercase;
}
.footer-links{display:flex;flex-direction:column;gap:.45rem}
.footer-link{
  display:inline-block;font-size:.95rem;color:var(--text);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:var(--gold);transform:translateX(3px)}
.footer-contact{display:flex;flex-direction:column;gap:.7rem}
.footer-contact__row{display:flex;flex-wrap:wrap;align-items:flex-start;gap:.5rem}
.footer-contact__label{
  flex:0 0 3.2rem;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--muted);padding-top:.2rem;
}
.footer-contact__value{flex:1 1 12rem;font-size:.92rem;line-height:1.6;color:var(--text);word-break:break-word}
.copy-btn{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);
  border:1px solid var(--rule);border-radius:var(--radius);padding:.12rem .45rem;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.copy-btn:hover{color:var(--ice);border-color:var(--violet)}
.copy-btn[data-copied]{background:var(--data);border-color:var(--data);color:#06202A;font-weight:700}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem 1.5rem;
  padding-block:1.1rem;border-top:1px solid var(--rule);font-size:.8rem;color:var(--muted);
}
.footer-note{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em}
.footer-legal{color:var(--muted)}
.footer-bottom__links{display:flex;flex-wrap:wrap;gap:1.1rem}
.footer-bottom__links .footer-link{font-size:.82rem;color:var(--muted)}
.footer-bottom__links .footer-link:hover{color:var(--gold)}

/* ===== 响应式 ===== */
@media (max-width:1100px){
  .layout-rail{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;order:-1;border-left:0;padding-left:0;border-bottom:1px solid var(--rule);padding-bottom:.75rem}
  .rail__link::before{display:none}
  .note-vertical{display:none}
}
@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .masthead{grid-template-columns:auto minmax(0,1fr) auto;gap:.6rem}
  .masthead__brand{grid-column:2;flex-direction:column;gap:.3rem;text-align:center}
  .masthead__brand::before{display:none}
  .masthead__meta{border-left:0;padding-left:0;align-items:center}
  .masthead__cn{font-size:1.6rem}
  .masthead__aside{grid-column:3}
  .login-entry{padding:.4rem .7rem;font-size:.8rem;letter-spacing:.06em}
  .site-nav{display:none;background:rgba(13,21,48,.97);border-top:1px solid var(--rule)}
  .site-nav[data-open]{display:block;animation:navIn .2s var(--ease) both}
  .site-nav__list{flex-direction:column;gap:0;padding-block:.35rem}
  .site-nav__item{width:100%}
  .site-nav__link{padding:.85rem 1rem;border-bottom:1px dashed rgba(34,48,90,.7);font-size:1rem}
  .site-nav__link::after{left:1rem;right:auto;width:26px;bottom:.55rem}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .site-main{padding-block:1rem 0}
}
@keyframes navIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
@media (max-width:640px){
  .header-meta__coord{display:none}
  .header-meta__inner{justify-content:flex-end}
  .masthead__tagline{display:none}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (min-width:680px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1080px){
  .footer-grid{grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,.75fr)) minmax(0,1.3fr)}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  body::after,.starfield::before{animation:none}
  html[data-js="on"] .reveal{opacity:1;transform:none}
  .footer-link:hover{transform:none}
  .tabs__panel{animation:none}
}