:root{
  --void:#050B16;
  --panel:#0E1B31;
  --rock:#7E8891;
  --moss:#3E6B52;
  --clay:#C4693C;
  --bone:#F1EAD9;
  --cyan:#2FE3C8;
  --amber:#FF8A2B;
  --grape:#7A2E8F;
  --rose:#D9496B;
  --line-c:rgba(126,136,145,.28);
  --line:1px solid var(--line-c);
  --rail-w:236px;
  --topbar-h:58px;
  --r-xl:32px;
  --r-lg:24px;
  --r-md:16px;
  --r-pill:999px;
  --pad-page:clamp(18px,3.6vw,56px);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--void);-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video,picture{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:8px}
::selection{background:rgba(47,227,200,.3);color:var(--bone)}
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.9;
  font-weight:400;
  color:var(--bone);
  background-color:var(--void);
  background-image:
    radial-gradient(1080px 620px at 94% -10%,rgba(122,46,143,.22),transparent 62%),
    radial-gradient(760px 520px at -8% 16%,rgba(47,227,200,.09),transparent 60%),
    radial-gradient(900px 700px at 60% 120%,rgba(255,138,43,.07),transparent 65%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  padding-left:var(--rail-w);
  padding-top:var(--topbar-h);
}
body.is-nav-open{overflow:hidden}
h1,h2,h3,h4{font-weight:900;line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,5.6vw,4rem)}
h2{font-size:clamp(1.5rem,3vw,2.1rem)}
h3{font-size:clamp(1.15rem,2vw,1.4rem);line-height:1.35}
h4{font-size:1rem;line-height:1.5}
.num,code,kbd,samp{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.container{width:100%;max-width:1160px;margin-inline:auto}
#main-content{display:block;padding:clamp(24px,3.6vw,52px) var(--pad-page) clamp(44px,6vw,88px)}
.section{margin-top:clamp(36px,5vw,72px)}
.section:first-child{margin-top:0}
.prose{max-width:34em}
.prose p{max-width:34em;margin-bottom:1.1em;color:rgba(241,234,217,.86)}
.prose a{border-bottom:1px solid rgba(47,227,200,.5)}
.prose a:hover{color:var(--cyan)}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:14px;z-index:140;
  transform:translateY(-220%);
  background:var(--cyan);color:#04110E;
  font-size:14px;font-weight:800;letter-spacing:.02em;
  padding:10px 20px;border-radius:var(--r-pill);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 头部框架 ---------- */
.site-header{position:relative;z-index:80}
.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:90;
  display:flex;flex-direction:column;gap:18px;
  padding:24px 20px 20px;
  background:linear-gradient(180deg,#081326 0%,#060D1B 56%,#050B16 100%);
  border-right:var(--line);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.rail__brand{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:5px 12px;align-items:center;
  padding-bottom:18px;border-bottom:var(--line);
}
.rail__mark{
  grid-row:span 2;width:42px;height:42px;border-radius:14px;
  background:linear-gradient(150deg,var(--grape),var(--rose) 52%,var(--amber));
  display:grid;place-items:center;flex:none;
}
.rail__mark-dot{
  width:12px;height:12px;border-radius:50%;background:var(--void);
  box-shadow:0 0 0 3px rgba(5,11,22,.45);
}
.rail__name{display:flex;align-items:baseline;gap:6px;font-size:19px;font-weight:900;letter-spacing:-.01em}
.rail__name i{
  font-style:normal;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--cyan);border:1px solid rgba(47,227,200,.42);border-radius:var(--r-pill);
  padding:1px 7px;transform:translateY(-2px);
}
.rail__tag{font-size:11.5px;line-height:1.55;color:rgba(241,234,217,.5);letter-spacing:.02em}
.rail__nav{margin-top:2px;min-width:0}
.rail__list{display:flex;flex-direction:column;gap:2px}
.rail__link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:10px 12px 10px 14px;border-radius:12px;
  font-size:15px;color:rgba(241,234,217,.68);
  transition:background .18s ease,color .18s ease,padding-left .18s ease;
}
.rail__link::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:0;border-radius:3px;
  background:var(--cyan);transform:translateY(-50%);transition:height .2s ease;
}
.rail__link:hover{background:rgba(47,227,200,.07);color:var(--bone)}
.rail__link:hover::before{height:14px}
.rail__link[aria-current="page"]{background:rgba(47,227,200,.12);color:var(--bone);padding-left:18px}
.rail__link[aria-current="page"]::before{height:22px}
.rail__idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--rock);transition:color .18s ease}
.rail__link[aria-current="page"] .rail__idx{color:var(--cyan)}
.rail__label{font-weight:600}
.rail__foot{margin-top:auto;padding-top:16px;border-top:var(--line);display:grid;gap:7px}
.rail__state{display:flex;align-items:center;gap:8px;font-size:12px;color:rgba(241,234,217,.72)}
.rail__meta{font-size:11.5px;line-height:1.6;color:var(--rock);letter-spacing:.02em}
.dot{
  display:inline-block;flex:none;width:7px;height:7px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 0 3px rgba(47,227,200,.16);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(47,227,200,.42)}
  50%{box-shadow:0 0 0 6px rgba(47,227,200,0)}
}
.statusbar{
  position:fixed;top:0;left:var(--rail-w);right:0;height:var(--topbar-h);z-index:70;
  display:flex;align-items:center;gap:clamp(14px,2vw,28px);
  padding-inline:var(--pad-page);
  background:rgba(6,13,26,.9);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-bottom:var(--line);
}
.statusbar__brand{display:none;align-items:baseline;gap:5px;font-size:16px;font-weight:900;letter-spacing:-.01em}
.statusbar__brand i{
  font-style:normal;font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--cyan);border:1px solid rgba(47,227,200,.42);border-radius:var(--r-pill);padding:1px 6px;
}
.statusbar__pulse{display:flex;align-items:center;gap:8px;font-size:12.5px;color:rgba(241,234,217,.66);letter-spacing:.02em}
.statusbar__quick{display:flex;align-items:center;gap:22px;margin-left:auto;font-size:14px}
.statusbar__quick a{
  color:rgba(241,234,217,.76);padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.statusbar__quick a:hover{color:var(--cyan);border-bottom-color:rgba(47,227,200,.6)}
.statusbar__cta{flex:none}
.progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--amber) 62%,var(--rose));
  pointer-events:none;
}
.navtoggle{
  display:none;align-items:center;gap:9px;flex:none;
  padding:8px 15px;border:1px solid var(--line-c);border-radius:var(--r-pill);
  font-size:13px;font-weight:600;color:var(--bone);
  transition:border-color .18s ease,background .18s ease;
}
.navtoggle:hover{border-color:rgba(47,227,200,.5);background:rgba(47,227,200,.08)}
.navtoggle__bars{display:grid;gap:3px;width:16px}
.navtoggle__bars i{display:block;height:2px;border-radius:2px;background:var(--cyan);transition:transform .2s ease,opacity .2s ease}
.navtoggle[aria-expanded="true"] .navtoggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.navtoggle[aria-expanded="true"] .navtoggle__bars i:nth-child(2){opacity:0}
.navtoggle[aria-expanded="true"] .navtoggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.navtoggle__text{white-space:nowrap}
@keyframes railIn{from{opacity:0;transform:translateX(-12px)}to{opacity:1;transform:none}}

/* ---------- 通用按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--r-pill);
  font-size:14px;font-weight:700;letter-spacing:.01em;
  border:1px solid transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--primary{background:var(--amber);color:#170B02}
.btn--primary:hover{background:#FFA355;transform:translateY(-1px)}
.btn--ghost{border-color:rgba(47,227,200,.42);color:var(--cyan);background:rgba(47,227,200,.06)}
.btn--ghost:hover{background:rgba(47,227,200,.15);transform:translateY(-1px)}
.pill{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 14px;border-radius:var(--r-pill);
  font-size:12.5px;font-weight:600;letter-spacing:.02em;color:var(--bone);
  background:rgba(62,107,82,.28);border:1px solid rgba(62,107,82,.7);
}
.pill--clay{background:rgba(196,105,60,.22);border-color:rgba(196,105,60,.7)}
.pill--live{background:linear-gradient(90deg,rgba(122,46,143,.55),rgba(217,73,107,.5));border-color:rgba(217,73,107,.6)}

/* ---------- 章节头 / 面板 / 网格 ---------- */
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:end;gap:16px;
  padding-bottom:14px;margin-bottom:clamp(20px,3vw,32px);
  border-bottom:1px solid rgba(47,227,200,.34);
}
.section-head__idx{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--clay)}
.section-head__title{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:900;line-height:1.15;letter-spacing:-.01em}
.section-head__note{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:12px;letter-spacing:.3em;color:var(--rock);
  max-height:84px;overflow:hidden;
}
.panel{
  background-color:var(--panel);
  background-image:radial-gradient(rgba(241,234,217,.045) 1px,transparent 1px);
  background-size:4px 4px;
  border:1px solid rgba(126,136,145,.2);
  border-radius:var(--r-lg);
  padding:clamp(16px,2.3vw,28px);
}
.grid{display:grid;gap:clamp(14px,2vw,22px);min-width:0}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
@media (min-width:1024px){
  .grid--split{grid-template-columns:4fr 7fr;align-items:start}
}

/* ---------- 图片与图表容器（供页面阶段使用） ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;width:100%;
  border-radius:var(--r-lg);
  border:1px solid rgba(126,136,145,.22);
  background:linear-gradient(160deg,#122444,#070F1E 72%);
}
.media img,.media svg,.media picture,.media video{width:100%;height:100%;object-fit:cover}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:4/5}
.media--chart{aspect-ratio:5/3}
.media--field::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(47,227,200,.11) 1px,transparent 1px),
    linear-gradient(90deg,rgba(47,227,200,.11) 1px,transparent 1px);
  background-size:34px 34px;
}
.media__label{
  position:absolute;left:14px;bottom:12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:rgba(241,234,217,.78);
  background:rgba(5,11,22,.66);border-radius:var(--r-pill);padding:4px 11px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:12.5px;color:var(--rock);margin-bottom:20px}
.breadcrumb li{display:flex;align-items:center;gap:14px}
.breadcrumb a{color:rgba(241,234,217,.72);border-bottom:1px solid rgba(47,227,200,.32)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb li:not(:last-child)::after{content:"/";color:rgba(126,136,145,.5)}

/* ---------- 页脚 ---------- */
.site-footer{
  background:linear-gradient(180deg,#040A14,#03070D 72%);
  border-top:var(--line);
  padding:clamp(34px,5vw,68px) var(--pad-page) 26px;
  color:var(--bone);
}
.site-footer__inner{display:grid;gap:clamp(26px,4vw,56px);grid-template-columns:1fr}
@media (min-width:900px){
  .site-footer__inner{grid-template-columns:minmax(240px,1fr) minmax(0,1.9fr)}
}
.footer__brand{display:grid;gap:10px;justify-items:start}
.footer__mark{font-size:22px;font-weight:900;letter-spacing:-.01em}
.footer__mark span{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--cyan);
  border:1px solid rgba(47,227,200,.42);border-radius:var(--r-pill);padding:1px 7px;
  vertical-align:middle;margin-left:4px;
}
.footer__tag{font-size:13px;color:rgba(241,234,217,.66);letter-spacing:.02em}
.footer__lead{font-size:13.5px;line-height:1.85;color:var(--rock);max-width:24em}
.footer__cols{display:grid;gap:clamp(20px,3vw,36px);grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}
.footer__col{min-width:0}
.footer__coltitle{font-size:12px;font-weight:700;letter-spacing:.22em;color:var(--clay);margin-bottom:12px}
.footer__links{display:grid;gap:9px;font-size:14.5px}
.footer__links a{
  color:rgba(241,234,217,.76);border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
}
.footer__links a:hover{color:var(--cyan);border-bottom-color:rgba(47,227,200,.55)}
.footer__contact{
  display:grid;gap:14px;
  margin-top:clamp(28px,4vw,46px);padding-top:22px;
  border-top:var(--line);
}
@media (min-width:768px){
  .footer__contact{grid-template-columns:repeat(3,minmax(0,1fr))}
}
.footer__item{display:flex;flex-direction:column;gap:4px;font-size:14px;min-width:0}
.footer__label{font-size:11px;letter-spacing:.2em;color:var(--rock)}
.footer__value{color:rgba(241,234,217,.9);word-break:break-word}
.footer__base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;margin-top:26px;padding-top:18px;
  border-top:var(--line);font-size:12.5px;color:var(--rock);
}
.footer__legal,.footer__copy,.footer__note{min-width:0}

/* ---------- 入场显现 ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s ease-out,transform .5s ease-out}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 移动 / 平板 ---------- */
@media (max-width:1023px){
  :root{--rail-w:0px;--topbar-h:56px}
  body{padding-left:0}
  .rail{
    top:var(--topbar-h);width:min(84vw,320px);z-index:95;
    transform:translateX(-104%);pointer-events:none;
    transition:transform .3s cubic-bezier(.2,.7,.3,1);
    box-shadow:28px 0 70px rgba(0,0,0,.55);
  }
  .rail[data-open="true"]{transform:translateX(0);pointer-events:auto}
  .statusbar{left:0}
  .statusbar__brand{display:flex}
  .statusbar__pulse{display:none}
  .statusbar__quick{display:none}
  .statusbar__cta{display:none}
  .navtoggle{display:inline-flex;margin-left:auto}
  .section-head{grid-template-columns:auto minmax(0,1fr)}
  .section-head__note{display:none}
  [data-nav][data-open="true"] .rail__link{animation:railIn .32s ease-out both}
  [data-nav][data-open="true"] .rail__list>li:nth-child(1) .rail__link{animation-delay:.02s}
  [data-nav][data-open="true"] .rail__list>li:nth-child(2) .rail__link{animation-delay:.06s}
  [data-nav][data-open="true"] .rail__list>li:nth-child(3) .rail__link{animation-delay:.1s}
  [data-nav][data-open="true"] .rail__list>li:nth-child(4) .rail__link{animation-delay:.14s}
  [data-nav][data-open="true"] .rail__list>li:nth-child(5) .rail__link{animation-delay:.18s}
  [data-nav][data-open="true"] .rail__list>li:nth-child(6) .rail__link{animation-delay:.22s}
}
@media (max-width:560px){
  body{font-size:16px}
  .statusbar{gap:12px}
  .navtoggle__text{display:none}
  .footer__base{flex-direction:column;align-items:flex-start}
}

/* ---------- 无障碍动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .progress{transition:none}
}