:root{
  --ink:#070A12;
  --navy:#0C1424;
  --blueprint:#12294A;
  --blue:#1E5BFF;
  --cyan:#00E5FF;
  --orange:#FF8A1F;
  --magenta:#FF2E8A;
  --fog:#D8E4F2;
  --slate:#8FA3BF;
  --paper:#F4F8FF;

  --shell:1280px;
  --gutter:clamp(16px,4vw,56px);
  --skew:-2.5deg;
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-body:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

*,*::before,*::after{box-sizing:border-box}

html{
  background:var(--ink);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}

body{
  min-height:100vh;
  overflow-x:hidden;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(18,41,74,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,41,74,.55) 1px,transparent 1px);
  background-size:96px 96px,96px 96px;
  background-attachment:fixed;
  color:var(--fog);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
strong{color:var(--paper);font-weight:700}

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

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:-72px;
  left:16px;
  z-index:300;
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  color:#04070e;
  background:var(--cyan);
  border:1px solid var(--paper);
  clip-path:polygon(0 0,100% 0,calc(100% - 12px) 100%,0 100%);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- shell & layout ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.page-shell{
  position:relative;
  padding-block:clamp(32px,5vw,72px) clamp(48px,6vw,96px);
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(12px,1.6vw,24px);
}

/* ---------- typography ---------- */
.t-display{
  display:inline-block;
  font-size:clamp(2.4rem,5.4vw,4rem);
  line-height:1.06;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--paper);
  transform:skewX(var(--skew));
  transform-origin:left bottom;
}
.t-section{
  font-size:clamp(1.65rem,3vw,2.25rem);
  line-height:1.15;
  font-weight:800;
  letter-spacing:-.015em;
  color:var(--paper);
}
.t-sub{
  font-size:clamp(1.1rem,1.7vw,1.4rem);
  line-height:1.3;
  font-weight:700;
  color:var(--fog);
}
.t-note{
  font-size:13px;
  line-height:1.7;
  letter-spacing:.04em;
  color:var(--slate);
}
.num{
  font-family:var(--font-mono);
  font-weight:600;
  letter-spacing:.04em;
  font-variant-numeric:tabular-nums;
}

.sec-index{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--slate);
  margin-bottom:14px;
}
.sec-index::before{
  content:"";
  width:30px;
  height:1px;
  background:var(--cyan);
  flex:none;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 20px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  color:var(--fog);
  border:1px solid var(--blueprint);
  background:rgba(12,20,36,.7);
  clip-path:polygon(0 0,100% 0,calc(100% - 12px) 100%,0 100%);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--paper);transform:translateY(-2px)}
.btn:active{transform:translateY(0)}

.btn--signal{
  color:#170a02;
  background:var(--orange);
  border-color:var(--orange);
  box-shadow:0 0 0 1px rgba(255,138,31,.18);
}
.btn--signal:hover{
  color:#170a02;
  background:#ffa248;
  border-color:#ffd0a0;
}

.btn--ghost{
  color:var(--fog);
  background:transparent;
  border-color:rgba(216,228,242,.26);
}
.btn--ghost:hover{
  color:var(--paper);
  border-color:var(--cyan);
  background:rgba(0,229,255,.08);
}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:#0a1220;
  background:var(--paper);
  border:1px solid var(--paper);
  clip-path:polygon(0 0,100% 0,calc(100% - 6px) 100%,0 100%);
}
.tag--cyan{color:var(--cyan);background:rgba(0,229,255,.1);border-color:rgba(0,229,255,.5)}
.tag--signal{color:var(--orange);background:rgba(255,138,31,.1);border-color:rgba(255,138,31,.55)}
.tag--magenta{color:var(--magenta);background:rgba(255,46,138,.1);border-color:rgba(255,46,138,.55)}

/* ---------- panel ---------- */
.panel{
  position:relative;
  padding:clamp(16px,2.2vw,28px);
  background:rgba(12,20,36,.86);
  border:1px solid var(--blueprint);
  transition:border-color .18s var(--ease),transform .18s var(--ease);
}
.panel:hover{border-color:rgba(0,229,255,.55)}
.panel--paper{
  background:var(--paper);
  border-color:var(--paper);
  color:#0b1525;
}
.panel--paper .t-sub,
.panel--paper strong{color:#0b1525}
.panel--paper .t-note{color:#41546e}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{
  margin-bottom:clamp(18px,2.4vw,28px);
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:0;
  margin:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--slate);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:rgba(18,41,74,1);color:#31527c}
.breadcrumbs a{color:var(--slate);border-bottom:1px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease)}
.breadcrumbs a:hover{color:var(--cyan);border-bottom-color:rgba(0,229,255,.5)}
.breadcrumbs [aria-current="page"]{color:var(--fog)}

/* ---------- prose ---------- */
.prose{
  max-width:70ch;
  font-size:17px;
  line-height:1.78;
  color:var(--fog);
}
.prose > * + *{margin-top:1.05em}
.prose h2{
  margin-top:1.9em;
  font-size:clamp(1.4rem,2.3vw,1.85rem);
  line-height:1.2;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--paper);
}
.prose h3{
  margin-top:1.6em;
  font-size:1.15rem;
  font-weight:700;
  color:var(--paper);
}
.prose ul,.prose ol{
  padding-left:1.25em;
  line-height:1.7;
}
.prose li + li{margin-top:.4em}
.prose a{
  color:var(--blue);
  border-bottom:1px solid rgba(30,91,255,.55);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.prose a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.prose blockquote{
  margin-inline:0;
  padding:14px 18px;
  border-left:2px solid var(--cyan);
  background:rgba(12,20,36,.8);
  color:var(--fog);
}

/* ---------- media frame（页面阶段放图片占位） ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:
    linear-gradient(135deg,rgba(30,91,255,.18),rgba(7,10,18,.9) 55%),
    repeating-linear-gradient(45deg,rgba(18,41,74,.9) 0 1px,transparent 1px 12px);
  border:1px solid var(--blueprint);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__tag{
  position:absolute;
  left:14px;
  top:14px;
  z-index:2;
}
.media-frame__body{
  position:relative;
  z-index:2;
  padding:clamp(14px,2vw,24px);
  display:flex;
  flex-direction:column;
  gap:8px;
}

/* ============================================================
   头部
   ============================================================ */
.site-header{
  position:relative;
  z-index:90;
  background:linear-gradient(180deg,rgba(12,20,36,.98),rgba(7,10,18,.92));
  border-bottom:1px solid var(--blueprint);
}

.hud-bar{
  border-bottom:1px solid var(--blueprint);
  background:
    linear-gradient(90deg,rgba(30,91,255,.14),transparent 42%,rgba(0,229,255,.07) 76%,transparent);
}

.hud-inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  min-height:64px;
  padding-block:8px;
}

.brand-lockup{
  display:flex;
  align-items:center;
  gap:12px;
  flex:none;
  transition:opacity .18s var(--ease);
}
.brand-lockup:hover{opacity:.86}

.brand-mark{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  flex:none;
  font-family:var(--font-mono);
  font-size:16px;
  font-weight:700;
  color:var(--paper);
  background:linear-gradient(140deg,var(--blue),#0a1f4d 78%);
  border:1px solid rgba(0,229,255,.55);
  transform:skewX(-8deg);
}
.brand-mark__glyph{transform:skewX(8deg)}

.brand-text{
  display:flex;
  flex-direction:column;
  gap:1px;
  min-width:0;
}
.brand-name{
  display:inline-block;
  font-size:17px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--paper);
  transform:skewX(var(--skew));
  transform-origin:left center;
}
.brand-line{
  font-size:12px;
  line-height:1.4;
  letter-spacing:.04em;
  color:var(--slate);
  white-space:nowrap;
}

.hud-status{
  display:flex;
  align-items:center;
  gap:9px;
  margin-left:auto;
  font-size:13px;
  line-height:1.4;
  letter-spacing:.03em;
  color:var(--slate);
  white-space:nowrap;
}
.status-dot{
  width:7px;
  height:7px;
  flex:none;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,229,255,.14);
  animation:kit-pulse 2.4s ease-in-out infinite;
}
.hud-status__tick{
  padding:1px 7px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--cyan);
  border:1px solid rgba(0,229,255,.35);
  background:rgba(0,229,255,.07);
}
@keyframes kit-pulse{
  0%,100%{opacity:.45;transform:scale(.85)}
  50%{opacity:1;transform:scale(1)}
}

.hud-cta{flex:none}

/* 下层栏目条 */
.nav-deck{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(7,10,18,.94);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--blueprint);
}
.nav-deck::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:1px;
  background:linear-gradient(90deg,var(--cyan),var(--blue) 38%,rgba(18,41,74,0) 92%);
  opacity:.75;
  pointer-events:none;
}

.nav-deck__inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
  min-height:54px;
}

.primary-nav{min-width:0}

.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.nav-item{display:block}

.nav-link{
  position:relative;
  display:flex;
  align-items:center;
  gap:7px;
  padding:9px 12px;
  font-size:14px;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.01em;
  color:var(--slate);
  border:1px solid transparent;
  border-bottom-color:transparent;
  transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.nav-link:hover{
  color:var(--paper);
  background:rgba(30,91,255,.14);
  border-color:rgba(30,91,255,.45);
  transform:translateY(-2px);
}
.nav-link[aria-current="page"]{
  color:var(--paper);
  background:rgba(30,91,255,.2);
  border-color:rgba(30,91,255,.6);
}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:-1px;
  height:2px;
  background:var(--cyan);
}
.nav-link[aria-current="page"] .nav-index{color:var(--cyan)}

.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.08em;
  color:rgba(143,163,191,.62);
  transition:color .16s var(--ease);
}
.nav-link:hover .nav-index{color:var(--cyan)}

.nav-note{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:rgba(143,163,191,.6);
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:11px;
  padding:11px 14px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--fog);
  border:1px solid var(--blueprint);
  background:rgba(12,20,36,.85);
  transition:border-color .16s var(--ease),color .16s var(--ease),background .16s var(--ease);
}
.nav-toggle:hover{border-color:rgba(0,229,255,.55);color:var(--paper)}
.nav-toggle[aria-expanded="true"]{
  border-color:var(--orange);
  color:var(--paper);
  background:rgba(255,138,31,.12);
}
.nav-toggle__bars{
  position:relative;
  width:18px;
  height:2px;
  flex:none;
  background:var(--cyan);
  box-shadow:0 -6px 0 var(--cyan),0 6px 0 var(--cyan);
  transition:box-shadow .16s var(--ease),background .16s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{
  background:var(--orange);
  box-shadow:0 -6px 0 var(--orange),0 6px 0 var(--orange);
}
.nav-toggle__label{white-space:nowrap}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(32px,5vw,72px);
  border-top:1px solid var(--blueprint);
  background:linear-gradient(180deg,rgba(12,20,36,.96),rgba(7,10,18,1) 62%);
  color:var(--fog);
}

.foot-grid{
  display:grid;
  grid-template-columns:1.6fr .85fr .85fr .85fr 1.45fr;
  gap:clamp(20px,3vw,44px);
  padding-block:clamp(32px,4.5vw,60px);
}

.foot-brand{min-width:0}
.brand-mark--footer{
  width:42px;
  height:42px;
  font-size:18px;
  margin-bottom:14px;
}
.foot-brand__name{
  font-size:18px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--paper);
  margin-bottom:8px;
}
.foot-brand__desc{
  max-width:30ch;
  font-size:14px;
  line-height:1.7;
  color:var(--slate);
  margin-bottom:18px;
}

.foot-col{min-width:0}
.foot-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.foot-col__title::after{
  content:"";
  flex:1;
  height:1px;
  background:linear-gradient(90deg,rgba(0,229,255,.4),transparent);
}

.foot-list{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:9px;
  font-size:14px;
  line-height:1.5;
}
.foot-list a{
  display:inline-block;
  color:var(--slate);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.foot-list a:hover{
  color:var(--paper);
  border-bottom-color:var(--cyan);
  transform:translateX(2px);
}

.foot-list--meta{gap:12px}
.foot-list--meta li{display:flex;flex-wrap:wrap;gap:7px;align-items:baseline}
.foot-key{
  flex:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(143,163,191,.75);
  border:1px solid var(--blueprint);
  padding:1px 6px;
}
.foot-val{
  min-width:0;
  font-size:13px;
  line-height:1.6;
  color:var(--fog);
  word-break:break-word;
}
.foot-note{
  margin-top:14px;
  font-size:12px;
  line-height:1.65;
  color:rgba(143,163,191,.85);
}

.foot-ruler{
  height:9px;
  border-top:1px solid var(--blueprint);
  background-image:repeating-linear-gradient(90deg,rgba(30,91,255,.55) 0 1px,transparent 1px 24px);
  background-position:left center;
  background-size:24px 100%;
  background-repeat:repeat-x;
}

.foot-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 22px;
  padding-block:18px 26px;
  border-top:1px solid var(--blueprint);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.03em;
  color:var(--slate);
}
.foot-legal__copy{margin-right:auto}
.foot-legal__icp{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  color:rgba(143,163,191,.9);
}
.foot-legal__links{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  margin:0;
  padding:0;
  list-style:none;
}
.foot-legal__links a{
  color:var(--slate);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.foot-legal__links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* ---------- 滚动进度条（脚本注入） ---------- */
.scroll-progress{
  position:fixed;
  left:0;
  top:0;
  right:0;
  height:2px;
  z-index:250;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--blue) 58%,var(--orange));
  pointer-events:none;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1100px){
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr;row-gap:32px}
  .foot-col--meta{grid-column:span 3}
  .foot-brand{grid-column:span 3}
}

@media (max-width:900px){
  body{background-attachment:scroll;background-size:64px 64px,64px 64px}

  .hud-inner{flex-wrap:wrap;row-gap:10px;padding-block:10px}
  .hud-status{margin-left:0;order:3;width:100%}
  .hud-cta{margin-left:auto}

  .nav-deck__inner{flex-wrap:wrap;padding-block:10px}
  .nav-toggle{display:inline-flex;order:1}
  .nav-note{order:2;margin-left:auto}
  .primary-nav{
    order:3;
    display:none;
    width:100%;
    padding-top:10px;
    flex-basis:100%;
  }
  .nav-deck[data-open="true"] .primary-nav{display:block}
  .nav-deck[data-open="true"] .nav-note{color:var(--orange)}

  .nav-list{flex-direction:column;gap:0;width:100%}
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:13px 10px;
    border:0;
    border-left:2px solid transparent;
    border-bottom:1px solid rgba(18,41,74,.85);
    background:transparent;
  }
  .nav-link:hover{transform:none;border-left-color:var(--blue);background:rgba(30,91,255,.12)}
  .nav-link[aria-current="page"]{
    border-left-color:var(--cyan);
    background:rgba(30,91,255,.16);
  }
  .nav-link[aria-current="page"]::after{display:none}
}

@media (max-width:640px){
  body{font-size:16px}
  .brand-line{display:none}
  .hud-status__text{display:none}
  .hud-cta{width:100%;justify-content:flex-start;margin-left:0;clip-path:none}

  .foot-grid{grid-template-columns:1fr;row-gap:28px}
  .foot-brand,
  .foot-col--meta{grid-column:auto}
  .foot-legal{flex-direction:column;align-items:flex-start;gap:8px}
  .foot-legal__copy{margin-right:0}
}

@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;opacity:1;transform:none}
  .scroll-progress{display:none}
}