:root{
  --deep:#0B0F1A;
  --abyss:#070A12;
  --graphite:#151C2E;
  --orbit:#24304A;
  --mist:#EAF0FF;
  --star:#9AA7C7;
  --blue:#1A5CFF;
  --cyan:#00E5C3;
  --orange:#FF6B35;
  --amber:#FFB547;
  --mint:#4DE2A8;
  --rail-w:224px;
  --masthead-h:140px;
  --content-max:1440px;
  --gutter:24px;
  --cut:16px;
  --radius:16px;
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"Space Grotesk","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,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;
  min-height:100vh;
  font-family:var(--font-display);
  font-size:16px;
  line-height:1.75;
  color:var(--star);
  background-color:var(--abyss);
  background-image:
    radial-gradient(760px 520px at 8% -6%,rgba(26,92,255,.22),transparent 62%),
    radial-gradient(620px 460px at 96% 2%,rgba(0,229,195,.11),transparent 60%),
    linear-gradient(180deg,var(--deep) 0%,var(--abyss) 72%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{max-width:100%;}
a{color:var(--blue);text-decoration:none;}
a:hover{color:var(--cyan);}
button{font:inherit;color:inherit;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px;}
::selection{background:rgba(0,229,195,.28);color:#fff;}

h1,h2,h3,h4{color:var(--mist);letter-spacing:-.02em;}
h1{font-weight:900;font-size:clamp(44px,6vw,92px);line-height:1.02;}
h2{font-weight:800;font-size:clamp(28px,3.4vw,52px);line-height:1.12;}
h3{font-weight:700;font-size:clamp(20px,2vw,28px);line-height:1.3;}
h4{font-weight:700;font-size:18px;line-height:1.4;}
strong{color:var(--mist);font-weight:700;}

/* ---------- 布局基础 ---------- */
.container{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter);}
.section{padding-block:clamp(52px,7vw,104px);}
.section--tight{padding-block:clamp(30px,4vw,56px);}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter);}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-6{grid-column:span 6;}
.span-7{grid-column:span 7;}
.span-8{grid-column:span 8;}
.span-12{grid-column:span 12;}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:linear-gradient(90deg,var(--blue),var(--cyan));}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;border:1px solid transparent;border-radius:999px;
  font-family:var(--font-display);font-size:15px;font-weight:700;line-height:1.2;
  text-decoration:none;cursor:pointer;
  transition:transform .2s var(--ease),box-shadow .22s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn--signal{background:var(--orange);color:#12060A;box-shadow:0 10px 26px rgba(255,107,53,.28);}
.btn--signal:hover{background:#FF7F51;color:#12060A;transform:translateY(-2px);box-shadow:0 14px 34px rgba(255,107,53,.4);}
.btn--path{background:rgba(26,92,255,.16);border-color:rgba(26,92,255,.55);color:var(--mist);}
.btn--path:hover{background:rgba(26,92,255,.28);border-color:var(--cyan);color:var(--mist);transform:translateY(-2px);}
.btn--ghost{background:transparent;border-color:var(--orbit);color:var(--mist);}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px);}

/* ---------- 标签 / 面包屑 / 面板 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 10px;border:1px solid rgba(36,48,74,.95);border-radius:999px;
  background:rgba(21,28,46,.7);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--star);
}
.tag--live{color:var(--mint);border-color:rgba(77,226,168,.45);}
.tag--alert{color:var(--amber);border-color:rgba(255,181,71,.45);}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--star);
}
.breadcrumb a{color:var(--star);}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb > * + *::before{content:"/";margin-right:8px;color:var(--orbit);}

.panel{
  position:relative;
  padding:24px;
  border:1px solid rgba(36,48,74,.95);
  border-radius:var(--radius);
  background:linear-gradient(158deg,rgba(21,28,46,.96),rgba(11,15,26,.92));
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .24s var(--ease);
}
.panel:hover{transform:translateY(-4px);border-color:rgba(0,229,195,.55);box-shadow:0 20px 44px rgba(0,0,0,.48);}
.cut{
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}

/* ---------- 正文与目录 ---------- */
.prose{max-width:38em;}
.prose p{color:#C9D4EE;margin-block:0 1.05em;font-size:17px;line-height:1.75;}
.prose h3{margin-block:1.6em .6em;}
.prose ul,.prose ol{margin-block:0 1.2em;padding-left:1.3em;color:#C9D4EE;}
.prose ul{list-style:disc;}
.prose ol{list-style:decimal;}
.prose li{margin-block:.35em;}
.prose a{border-bottom:1px solid rgba(0,229,195,.4);}

.toc{display:flex;flex-direction:column;gap:2px;font-size:14px;}
.toc a{
  position:relative;display:block;padding:8px 0 8px 16px;
  color:var(--star);border-left:2px solid rgba(36,48,74,.9);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.toc a:hover{color:var(--mist);}
.toc a.is-active,.toc a[aria-current="true"]{color:var(--cyan);border-left-color:var(--cyan);}

/* ---------- 图片容器基础规则 ---------- */
.figure{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  border:1px solid rgba(36,48,74,.95);border-radius:var(--radius);
  background:linear-gradient(140deg,#101728,#0A0E18 60%);
}
.figure > img,
.figure > picture,
.figure > svg{display:block;width:100%;height:100%;object-fit:cover;}
.figure::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:2;
  background:
    radial-gradient(125% 105% at 50% 42%,transparent 38%,rgba(11,15,26,.8) 100%),
    linear-gradient(140deg,rgba(26,92,255,.22),rgba(0,229,195,.12) 58%,rgba(11,15,26,.62));
}
.figure--16x9{aspect-ratio:16/9;}
.figure--4x3{aspect-ratio:4/3;}
.figure--1x1{aspect-ratio:1/1;}
.figure--path{
  background-image:
    repeating-linear-gradient(122deg,rgba(26,92,255,.22) 0 1px,transparent 1px 22px),
    repeating-linear-gradient(62deg,rgba(0,229,195,.15) 0 1px,transparent 1px 34px),
    linear-gradient(140deg,#101728,#0A0E18);
}

/* ---------- 显现动效 ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
[data-reveal].is-in{opacity:1;transform:none;}

/* ---------- 头部 ---------- */
.skip-link{
  position:absolute;left:12px;top:8px;z-index:200;
  padding:10px 16px;border-radius:10px;
  background:var(--cyan);color:#04110E;font-weight:700;text-decoration:none;
  transform:translateY(-180%);transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#04110E;}

.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,rgba(7,10,18,.99),rgba(11,15,26,.96));
  border-bottom:1px solid var(--orbit);
  box-shadow:0 12px 30px rgba(0,0,0,.35);
}
.masthead{
  position:relative;
  width:100%;max-width:var(--content-max);margin-inline:auto;
  padding:12px var(--gutter) 0;
}
.masthead__bar{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;
}
.masthead__meta{
  display:flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--star);
}
.masthead__dot{width:6px;height:6px;flex:0 0 auto;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);}
.masthead__brand{
  position:relative;display:grid;justify-items:center;gap:2px;
  padding:6px 26px;text-decoration:none;color:var(--mist);
}
.masthead__brand:hover{color:var(--mist);}
.masthead__path{
  position:absolute;inset:0;width:100%;height:100%;
  z-index:0;pointer-events:none;opacity:.45;
}
.masthead__title{
  position:relative;z-index:1;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(22px,2.4vw,30px);line-height:1.1;letter-spacing:-.01em;
  color:var(--mist);
}
.masthead__sub{
  position:relative;z-index:1;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--star);
}
.masthead__utility{display:flex;align-items:center;justify-content:flex-end;gap:10px;}
.util-link{
  padding:8px 14px;border:1px solid var(--orbit);border-radius:999px;
  font-size:13.5px;font-weight:600;color:var(--mist);text-decoration:none;
  transition:border-color .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease);
}
.util-link:hover{border-color:var(--cyan);color:var(--cyan);}
.util-link--solid{background:rgba(26,92,255,.18);border-color:rgba(26,92,255,.6);}
.util-link--solid:hover{background:rgba(26,92,255,.32);border-color:var(--cyan);color:var(--mist);}

.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:40px;padding:0;
  border:1px solid var(--orbit);border-radius:10px;
  background:rgba(21,28,46,.85);cursor:pointer;
  transition:border-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);}
.nav-toggle__bar{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--mist);transition:background-color .2s var(--ease);}
.nav-toggle__bar::before,.nav-toggle__bar::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;
  background:var(--mist);transition:transform .22s var(--ease),top .22s var(--ease),background-color .2s var(--ease);
}
.nav-toggle__bar::before{top:-6px;}
.nav-toggle__bar::after{top:6px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before{top:0;transform:rotate(45deg);background:var(--cyan);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after{top:0;transform:rotate(-45deg);background:var(--cyan);}

.masthead__nav{margin-top:8px;border-top:1px solid rgba(36,48,74,.75);}
.masthead__nav-list{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:2px;}
.masthead__nav-list a{
  position:relative;display:block;padding:12px 15px;
  font-size:14.5px;font-weight:600;color:var(--star);text-decoration:none;
  transition:color .18s var(--ease);
}
.masthead__nav-list a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:7px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
  transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.masthead__nav-list a:hover{color:var(--mist);}
.masthead__nav-list a:hover::after{transform:scaleX(1);}
.masthead__nav-list a[aria-current="page"]{color:var(--mist);}
.masthead__nav-list a[aria-current="page"]::after{transform:scaleX(1);background:var(--cyan);}
.masthead__nav-list a[aria-current="page"]::before{
  content:"";position:absolute;top:5px;left:50%;transform:translateX(-50%);
  width:4px;height:4px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px var(--cyan);
}

.masthead__progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(36,48,74,.5);overflow:hidden;}
.masthead__progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .12s linear;}

/* ---------- 左侧固定分类导轨 ---------- */
.rail{
  display:flex;flex-direction:column;gap:12px;
  margin-top:8px;padding-top:10px;
  border-top:1px solid rgba(36,48,74,.55);
}
.rail__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--star);
}
.rail__list{display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;scrollbar-width:none;-ms-overflow-style:none;}
.rail__list::-webkit-scrollbar{display:none;}
.rail__list li{flex:0 0 auto;}
.rail__list a{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid rgba(36,48,74,.9);border-radius:999px;
  font-size:13.5px;font-weight:600;color:var(--star);text-decoration:none;white-space:nowrap;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.rail__list a::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--orbit);transition:background-color .2s var(--ease),box-shadow .2s var(--ease);}
.rail__list a:hover{color:var(--mist);border-color:rgba(26,92,255,.6);background:rgba(26,92,255,.14);}
.rail__list a:hover::before{background:var(--cyan);box-shadow:0 0 10px var(--cyan);}
.rail__foot{display:none;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--star);align-items:center;gap:8px;}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,var(--deep) 0%,var(--abyss) 100%);
  border-top:1px solid var(--orbit);
  padding-top:clamp(40px,5vw,64px);
}
.footer{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter);}
.footer__grid{
  display:grid;grid-template-columns:1.15fr 1.4fr 1fr;gap:clamp(24px,4vw,48px);
  padding-bottom:clamp(30px,4vw,44px);
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px;}
.footer__logo{
  font-family:var(--font-display);font-weight:900;font-size:clamp(28px,3vw,36px);
  line-height:1;letter-spacing:-.02em;color:var(--mist);
}
.footer__logo span{color:var(--cyan);}
.footer__line{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--star);}
.footer__note{max-width:26em;font-size:14px;line-height:1.7;color:var(--star);}
.footer__nav{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.footer__title{
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan);margin-bottom:12px;
}
.footer__links{display:flex;flex-direction:column;gap:8px;}
.footer__links a{
  display:inline-block;font-size:14.5px;color:var(--star);text-decoration:none;
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer__links a:hover{color:var(--mist);transform:translateX(3px);}
.footer__contact-list{display:flex;flex-direction:column;}
.footer__contact-list li{
  display:grid;grid-template-columns:52px 1fr;gap:10px;align-items:start;
  padding:9px 0;border-bottom:1px dashed rgba(36,48,74,.85);
}
.footer__contact-list li:first-child{padding-top:0;}
.k{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--star);padding-top:3px;}
.v{font-size:14.5px;color:var(--mist);word-break:break-word;}
.copy-btn{
  margin-left:8px;padding:2px 8px;border:1px solid var(--orbit);border-radius:6px;
  background:transparent;color:var(--star);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan);}
.copy-btn[data-copied="true"]{border-color:var(--mint);color:var(--mint);background:rgba(77,226,168,.12);}
.footer__hint{margin-top:12px;font-size:13px;line-height:1.7;color:var(--star);}

.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  padding-block:18px 22px;border-top:1px solid rgba(36,48,74,.85);
}
.footer__legal{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;}
.footer__legal a{color:var(--star);text-decoration:none;}
.footer__legal a:hover{color:var(--cyan);}
.footer__meta{
  display:flex;flex-wrap:wrap;gap:14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--star);
}
.footer__region{color:var(--amber);}

.to-top{
  position:fixed;right:20px;bottom:20px;z-index:70;
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 16px;border:1px solid rgba(0,229,195,.5);border-radius:999px;
  background:rgba(11,15,26,.94);color:var(--cyan);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;cursor:pointer;
  opacity:0;transform:translateY(10px);pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;transform:none;pointer-events:auto;}
.to-top:hover{border-color:var(--cyan);background:rgba(0,229,195,.14);}

/* ---------- 桌面：左导轨固定 ---------- */
@media (min-width:1200px){
  body{padding-left:var(--rail-w);}
  .site-header,.site-footer{margin-left:calc(-1 * var(--rail-w));}
  .rail{
    position:fixed;left:0;top:calc(var(--masthead-h) + 18px);
    width:var(--rail-w);max-height:calc(100vh - var(--masthead-h) - 36px);
    overflow-y:auto;margin-top:0;padding:22px 16px 22px 26px;
    border-top:0;border-right:1px solid rgba(36,48,74,.85);
    z-index:1;
  }
  .rail__label{display:block;}
  .rail__list{flex-direction:column;gap:4px;overflow:visible;padding-bottom:0;}
  .rail__list a{
    width:100%;border-radius:10px;border-color:transparent;
    padding:9px 12px;font-size:14px;
  }
  .rail__list a:hover{transform:translateX(3px);}
  .rail__foot{display:flex;}
  .masthead__bar{gap:24px;}
}

/* ---------- 平板 ---------- */
@media (max-width:1199px){
  .grid-12{grid-template-columns:repeat(8,minmax(0,1fr));}
  .span-8,.span-7,.span-6,.span-5,.span-4{grid-column:span 8;}
  .footer__grid{grid-template-columns:1fr 1fr;}
  .footer__contact{grid-column:span 2;}
}

@media (max-width:980px){
  .masthead__meta{display:none;}
  .masthead__bar{grid-template-columns:auto 1fr auto;gap:12px;}
  .masthead__brand{justify-items:start;padding:4px 12px;}
  .masthead__path{opacity:.32;}
  .nav-toggle{display:inline-flex;}
  .masthead__nav{
    position:absolute;left:0;right:0;top:100%;
    margin-top:0;padding:0 var(--gutter);
    background:linear-gradient(180deg,#0A0E18,#070A12);
    border-top:1px solid var(--orbit);border-bottom:1px solid var(--orbit);
    max-height:0;overflow:hidden;
    transition:max-height .3s var(--ease);
    box-shadow:0 24px 40px rgba(0,0,0,.55);
  }
  .masthead__nav[data-open="true"]{max-height:440px;overflow-y:auto;}
  .masthead__nav-list{flex-direction:column;align-items:stretch;gap:0;padding-block:8px;}
  .masthead__nav-list a{padding:13px 4px;border-bottom:1px solid rgba(36,48,74,.5);}
  .masthead__nav-list a::after{left:4px;right:auto;width:26px;bottom:8px;}
  .masthead__nav-list a[aria-current="page"]::before{display:none;}
  .footer__grid{grid-template-columns:1fr;gap:28px;}
  .footer__contact{grid-column:auto;}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  body{background-attachment:scroll;}
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 4;}
  .util-link{padding:7px 11px;font-size:12.5px;}
  .footer__nav{grid-template-columns:1fr 1fr;gap:18px;}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:10px;}
  .panel{padding:18px;}
  .to-top{right:14px;bottom:14px;padding:9px 13px;}
  .prose p{font-size:16px;}
}

/* ---------- 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!important;transform:none!important;}
  .panel:hover,.btn:hover{transform:none;}
  .footer__links a:hover{transform:none;}
}