:root{
  --abyss:#050B14;
  --deep:#08172B;
  --panel:#0E223C;
  --line:#23405F;
  --paper:#F3F7FA;
  --mist:#9FB4C7;
  --cyan:#3DF2DB;
  --cyan-lt:#9BFFF2;
  --amber:#FF8A3D;
  --amber-lt:#FFC29E;
  --red:#FF5D7A;
  --ink:#04120F;
  --nav-h:72px;
  --max:1280px;
  --gutter:clamp(20px,4.2vw,48px);
  --radius:16px;
  --font-display:"HarmonyOS Sans SC","PingFang SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 1px 0 rgba(255,255,255,.03),0 18px 40px -30px rgba(0,0,0,.95);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--abyss);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,p,figure,ul,ol,dl{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
[hidden]{display:none !important}
::selection{background:var(--cyan);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}

.mono{font-family:var(--font-mono);letter-spacing:.02em}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:100;
  padding:10px 18px;border-radius:999px;
  background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.read-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:70;
  background:rgba(35,64,95,.45);pointer-events:none;
}
.read-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-lt));
  box-shadow:0 0 12px rgba(61,242,219,.7);
  transition:transform .12s linear;
}

/* ---------- 顶部框架导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:linear-gradient(180deg,rgba(5,11,20,.97),rgba(8,23,43,.94));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}
.site-header__inner{
  width:100%;max-width:calc(var(--max) + var(--gutter) * 2);
  margin-inline:auto;padding-inline:var(--gutter);
  height:var(--nav-h);
  display:flex;align-items:center;gap:20px;
}
.brand{display:inline-flex;align-items:center;gap:11px;min-width:0}
.brand__mark{
  flex:0 0 auto;width:22px;height:24px;
  background:linear-gradient(150deg,var(--cyan) 0%,#1E9C92 58%,#0E223C 100%);
  clip-path:polygon(50% 0%,100% 25%,100% 75%,50% 100%,0% 75%,0% 25%);
  filter:drop-shadow(0 0 8px rgba(61,242,219,.45));
  transition:filter .22s var(--ease);
}
.brand:hover .brand__mark{filter:drop-shadow(0 0 13px rgba(61,242,219,.85))}
.brand__text{display:flex;flex-direction:column;min-width:0}
.brand__name{
  font-family:var(--font-display);font-weight:700;font-size:17px;
  letter-spacing:.04em;line-height:1.2;color:var(--paper);white-space:nowrap;
}
.brand__line{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.1em;
  color:var(--mist);line-height:1.4;white-space:nowrap;
}
.brand--footer .brand__name{font-size:21px}
.brand--footer .brand__line{font-size:10px;letter-spacing:.14em;color:var(--mist)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  margin-left:auto;padding:9px 13px;
  background:transparent;border:1px solid var(--line);border-radius:12px;
  color:var(--paper);cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:flex;flex-direction:column;justify-content:space-between;width:16px;height:12px}
.nav-toggle__bars span{display:block;height:1.5px;background:currentColor;border-radius:2px;transition:transform .2s var(--ease),width .2s var(--ease)}
.nav-toggle__bars span:last-child{width:70%;align-self:flex-end}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(5.25px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{width:100%;transform:translateY(-5.25px) rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:18px;margin-left:auto}
.site-nav__list{
  display:flex;align-items:center;gap:2px;
  padding:5px;border:1px solid var(--line);border-radius:999px;
  background:rgba(14,34,60,.5);
}
.site-nav__link{
  position:relative;display:block;padding:8px 14px;border-radius:999px;
  font-size:14px;line-height:1.25;color:var(--mist);white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.site-nav__link:hover{color:var(--paper);background:rgba(61,242,219,.07)}
.site-nav__link[aria-current="page"]{color:var(--cyan);background:rgba(61,242,219,.1)}
.site-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:3px;
  width:14px;height:2px;border-radius:2px;
  transform:translateX(-50%);
  background:var(--cyan);box-shadow:0 0 10px rgba(61,242,219,.75);
}
.site-nav__foot{display:flex;align-items:center;gap:14px}

.status-dot{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--mist);white-space:nowrap;
}
.status-dot__pulse{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(61,242,219,.16);
  animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(61,242,219,.16)}
  50%{box-shadow:0 0 0 6px rgba(61,242,219,.04)}
}

.frame-rail{
  position:fixed;top:0;bottom:0;width:1px;z-index:1;pointer-events:none;display:none;
  background:linear-gradient(180deg,transparent,var(--line) 10%,rgba(35,64,95,.35) 90%,transparent);
}
@media (min-width:1200px){.frame-rail{display:block}}
.frame-rail--left{left:24px}
.frame-rail--right{right:24px}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid transparent;border-radius:999px;
  font-family:var(--font-body);font-size:15px;font-weight:600;line-height:1.2;
  text-align:center;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn--sm{padding:8px 15px;font-size:13.5px}
.btn--block{display:flex;width:100%}
.btn--amber{
  background:var(--amber);border-color:var(--amber);color:#200D02;
  box-shadow:0 8px 20px -14px rgba(255,138,61,.9);
}
.btn--amber:hover{background:var(--amber-lt);border-color:var(--amber-lt);transform:translateY(-1px)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:0;padding:64px 0 0;color:var(--mist);
  background:radial-gradient(90% 120% at 12% 0%,rgba(14,34,60,.85),transparent 62%),var(--abyss);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:132px;height:1px;
  background:var(--cyan);box-shadow:0 0 14px rgba(61,242,219,.8);
}
.site-footer__inner{
  width:100%;max-width:calc(var(--max) + var(--gutter) * 2);
  margin-inline:auto;padding-inline:var(--gutter);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(230px,1.05fr) minmax(0,1.5fr) minmax(268px,1.1fr);
  gap:48px;padding-bottom:52px;
}
.footer-brand__tag{
  margin:16px 0 12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--cyan);
}
.footer-brand__note{font-size:14px;line-height:1.9;color:var(--mist);max-width:34ch}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.footer-col__title{
  margin:0 0 16px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.18em;color:var(--paper);
}
.footer-col__title::before{
  content:"";display:inline-block;width:6px;height:6px;margin-right:9px;
  background:var(--cyan);vertical-align:middle;
  clip-path:polygon(50% 0%,100% 25%,100% 75%,50% 100%,0% 75%,0% 25%);
}
.footer-col__list{display:flex;flex-direction:column;gap:11px}
.footer-link{
  position:relative;display:inline-block;padding-left:0;
  font-size:14.5px;color:var(--mist);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-link::before{
  content:"";position:absolute;left:0;top:50%;width:0;height:1px;
  background:var(--cyan);transition:width .18s var(--ease);
}
.footer-link:hover{color:var(--paper);padding-left:14px}
.footer-link:hover::before{width:9px}

.contact-list{display:flex;flex-direction:column;gap:14px}
.contact-item{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;
  padding-bottom:12px;border-bottom:1px solid rgba(35,64,95,.6);
}
.contact-item--plain{border-bottom:none;padding-bottom:0}
.contact-item__label{
  flex:0 0 100%;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;color:var(--mist);
}
.contact-item__value{font-size:14px;line-height:1.7;color:var(--paper);word-break:break-word}
.copy-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border:1px solid var(--line);border-radius:999px;
  background:transparent;color:var(--mist);cursor:pointer;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-btn--sm{padding:3px 9px;font-size:10px}
.copy-btn.is-copied{border-color:var(--cyan);color:var(--cyan);background:rgba(61,242,219,.12)}
.footer-contact__note{
  margin-top:16px;padding-left:12px;border-left:2px solid rgba(255,138,61,.6);
  font-size:12.5px;line-height:1.85;color:var(--mist);
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 28px;
  padding:22px 0 28px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--mist);
}
.footer-base__copy,.footer-base__icp{margin:0}
.footer-base__link{
  margin-left:auto;color:var(--cyan);
  border-bottom:1px solid transparent;
  transition:border-color .18s var(--ease);
}
.footer-base__link:hover{border-bottom-color:var(--cyan)}

/* ---------- 右下角客服仓与返回顶部 ---------- */
.help-dock{
  position:fixed;right:20px;bottom:20px;z-index:45;
  display:flex;flex-direction:column;align-items:flex-end;gap:10px;
}
.help-dock__panel{
  width:min(304px,calc(100vw - 40px));
  padding:18px;
  background:var(--panel);
  border:1px solid var(--line);border-radius:18px;
  box-shadow:0 28px 60px -26px rgba(0,0,0,.95),0 0 0 1px rgba(61,242,219,.06);
}
.help-dock__eyebrow{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;
  color:var(--cyan);margin-bottom:8px;
}
.help-dock__title{
  font-family:var(--font-display);font-weight:700;font-size:15px;
  color:var(--paper);margin-bottom:6px;
}
.help-dock__text{font-size:13px;line-height:1.75;color:var(--mist);margin-bottom:14px}
.help-dock__row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:14px}
.help-dock__value{
  font-family:var(--font-mono);font-size:11.5px;color:var(--paper);word-break:break-all;
}
.help-dock__link{
  display:block;margin-top:10px;text-align:center;
  font-size:12.5px;color:var(--mist);
  transition:color .18s var(--ease);
}
.help-dock__link:hover{color:var(--cyan)}
.help-dock__toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 17px;
  background:rgba(14,34,60,.94);
  border:1px solid rgba(61,242,219,.42);border-radius:999px;
  color:var(--paper);cursor:pointer;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;
  box-shadow:0 14px 32px -20px rgba(0,0,0,.95);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.help-dock__toggle:hover{color:var(--cyan);border-color:var(--cyan)}
.help-dock__icon{
  width:8px;height:8px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 4px rgba(61,242,219,.14);
}
.to-top{
  position:fixed;right:20px;bottom:92px;z-index:44;
  width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;
  background:rgba(14,34,60,.92);
  border:1px solid var(--line);border-radius:50%;
  color:var(--mist);cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{color:var(--cyan);border-color:var(--cyan)}
.to-top__icon{
  width:9px;height:9px;
  border-left:1.5px solid currentColor;border-top:1.5px solid currentColor;
  transform:rotate(45deg) translate(1px,1px);
}

/* ---------- 页面通用布局组件 ---------- */
.wrap{
  width:100%;max-width:calc(var(--max) + var(--gutter) * 2);
  margin-inline:auto;padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px 22px;
  margin-bottom:clamp(24px,3vw,36px);
}
.section-index{
  font-family:var(--font-display);font-weight:200;
  font-size:clamp(60px,9vw,120px);line-height:.78;letter-spacing:-.03em;
  color:rgba(159,180,199,.12);
  -webkit-text-stroke:1px rgba(35,64,95,.9);
}
.section-title{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(26px,3.2vw,40px);line-height:1.22;color:var(--paper);
}
.section-kicker{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  color:var(--cyan);margin-bottom:8px;
}
.section-note{font-size:15px;line-height:1.85;color:var(--mist);max-width:58ch;margin-top:12px}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--cyan);
}
.lede{font-size:clamp(16px,1.4vw,18px);line-height:1.9;color:var(--mist);max-width:62ch}
.prose{font-size:16px;line-height:1.85;color:var(--mist);max-width:64ch}
.prose p{margin-bottom:1em}
.prose h2,.prose h3{font-family:var(--font-display);color:var(--paper);line-height:1.3;margin:1.6em 0 .6em}

.breadcrumb{
  padding-block:20px;
  border-bottom:1px solid rgba(35,64,95,.5);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist);
}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:rgba(35,64,95,1)}
.breadcrumb__link{color:var(--mist);transition:color .18s var(--ease)}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--cyan)}

.card{
  background:var(--panel);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;
  box-shadow:var(--shadow);
  transition:border-color .22s var(--ease),box-shadow .22s var(--ease),transform .22s var(--ease);
}
.card:hover{border-color:rgba(61,242,219,.4);box-shadow:0 4px 0 rgba(0,0,0,.18),0 22px 44px -30px rgba(0,0,0,1);transform:translateY(-2px)}
.card__title{
  font-family:var(--font-display);font-weight:700;font-size:19px;
  line-height:1.35;color:var(--paper);margin-bottom:8px;
}
.card__text{font-size:14.5px;line-height:1.8;color:var(--mist)}
.card__meta{
  margin-top:14px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--mist);
}
.panel{
  background:linear-gradient(160deg,rgba(14,34,60,.95),rgba(8,23,43,.95));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(20px,3vw,28px);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  border:1px solid var(--line);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;
  color:var(--mist);
}
.tag--cyan{color:var(--cyan);border-color:rgba(61,242,219,.42);background:rgba(61,242,219,.08)}
.tag--amber{color:var(--amber-lt);border-color:rgba(255,138,61,.45);background:rgba(255,138,61,.1)}

.grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}

.media{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:18px;
  aspect-ratio:16/9;
  background:
    radial-gradient(120% 120% at 18% 0%,rgba(61,242,219,.18),transparent 58%),
    radial-gradient(90% 100% at 100% 100%,rgba(255,138,61,.14),transparent 55%),
    linear-gradient(160deg,var(--panel),var(--deep));
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:4/5}
.media__img{width:100%;height:100%;object-fit:cover}
.media__caption{
  position:absolute;left:14px;bottom:12px;
  padding:4px 9px;border-radius:7px;
  background:rgba(5,11,20,.66);border:1px solid var(--line);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--mist);
}
.media__badge{
  position:absolute;top:12px;left:12px;
  padding:4px 10px;border-radius:999px;
  background:rgba(5,11,20,.72);border:1px solid rgba(61,242,219,.42);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .site-nav__foot .status-dot{display:none}
}
@media (max-width:1023px){
  :root{--nav-h:64px}
  .brand__line{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:16px;
    margin-left:0;padding:18px var(--gutter) 24px;
    background:var(--deep);
    border-bottom:1px solid var(--line);
    box-shadow:0 34px 60px -34px rgba(0,0,0,1);
    max-height:calc(100vh - var(--nav-h));
    overflow-y:auto;
  }
  .site-header[data-open] .site-nav{display:flex;animation:navIn .22s var(--ease) both}
  @keyframes navIn{
    from{opacity:0;transform:translateY(-8px)}
    to{opacity:1;transform:none}
  }
  .site-nav__list{
    flex-direction:column;align-items:stretch;gap:2px;
    padding:6px;border-radius:18px;background:rgba(14,34,60,.72);
  }
  .site-nav__link{padding:12px 16px;border-radius:12px;font-size:16px;text-align:left}
  .site-nav__link[aria-current="page"]::after{
    left:4px;top:50%;bottom:auto;
    width:3px;height:18px;transform:translateY(-50%);
  }
  .site-nav__foot{flex-direction:column;align-items:stretch;gap:12px}
  .site-nav__foot .status-dot{display:inline-flex;justify-content:center}
  .site-nav__foot .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:40px;padding-bottom:44px}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:767px){
  .site-footer{padding-top:48px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .footer-base{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-base__link{margin-left:0}
  .grid--12{grid-template-columns:repeat(4,minmax(0,1fr))}
}
@media (max-width:640px){
  .help-dock{right:14px;bottom:14px}
  .help-dock__toggle{padding:10px 14px;font-size:11px}
  .to-top{right:14px;bottom:76px;width:36px;height:36px}
  .section-index{font-size:56px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .read-progress__bar{transition:none}
  .card:hover{transform:none}
  .btn--amber:hover{transform:none}
}