*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--ink-900);
  color:var(--ivory);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    radial-gradient(880px 520px at 78% -12%,rgba(49,230,214,.10),transparent 70%),
    radial-gradient(680px 480px at 4% 10%,rgba(255,106,42,.07),transparent 72%),
    linear-gradient(to right,rgba(233,237,242,.035) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(233,237,242,.028) 1px,transparent 1px);
  background-size:auto,auto,80px 80px,80px 80px;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
:root{
  --ink-900:#071824;
  --ink-800:#0B2233;
  --ink-700:#123247;
  --ash:#8A8F98;
  --ivory:#E9EDF2;
  --signal:#FF6A2A;
  --cyan:#31E6D6;
  --teal:#0E4A52;
  --amber:#F2B84B;
  --line:rgba(233,237,242,.10);
  --line-strong:rgba(233,237,242,.18);
  --max:1180px;
  --gutter:clamp(18px,5vw,56px);
  --r-md:12px;
  --r-lg:18px;
  --r-xl:26px;
  --r-pill:999px;
  --font-display:"Archivo Narrow","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","Noto Sans Mono CJK SC",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}
.zk-skip{
  position:fixed;top:8px;left:8px;z-index:200;
  transform:translateY(-160%);
  background:var(--cyan);color:var(--ink-900);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;
  padding:10px 18px;border-radius:var(--r-pill);
  transition:transform .16s ease;
}
.zk-skip:focus{transform:translateY(0)}
.zk-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------- 头部浮岛 ---------- */
.zk-header{
  position:sticky;top:0;z-index:60;
  padding:14px var(--gutter) 0;
}
.zk-progress{position:absolute;left:0;right:0;top:0;height:2px;background:rgba(233,237,242,.07);pointer-events:none}
.zk-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--signal));
  transition:width .12s linear;
}
.zk-header__shell{position:relative;max-width:var(--max);margin-inline:auto}
.zk-pill{
  display:flex;align-items:center;gap:clamp(8px,1.4vw,18px);
  padding:8px 8px 8px 16px;
  background:rgba(11,34,51,.88);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  box-shadow:0 14px 34px rgba(0,0,0,.34);
  transition:box-shadow .18s ease,border-color .18s ease,background-color .18s ease;
}
.zk-header[data-scrolled="true"] .zk-pill{
  background:rgba(9,28,42,.96);
  border-color:var(--line-strong);
  box-shadow:0 22px 48px rgba(0,0,0,.52);
}
.zk-brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;padding:4px 6px 4px 0;border-radius:var(--r-pill)}
.zk-brand__mark{
  position:relative;flex:0 0 auto;
  width:28px;height:28px;border-radius:9px;
  background:linear-gradient(140deg,var(--teal),var(--ink-700));
  border:1px solid rgba(49,230,214,.45);
  display:inline-flex;align-items:center;justify-content:center;
}
.zk-brand__mark::before{content:"";position:absolute;left:5px;right:5px;top:50%;height:1px;background:rgba(233,237,242,.32)}
.zk-brand__dot{width:7px;height:7px;border-radius:50%;background:var(--signal);box-shadow:0 0 0 3px rgba(255,106,42,.18)}
.zk-brand__text{display:flex;flex-direction:column;line-height:1.2}
.zk-brand__name{
  font-family:var(--font-display);
  font-size:17px;font-weight:700;letter-spacing:-.01em;color:var(--ivory);
}
.zk-brand__tag{
  margin-top:3px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;
  color:var(--ash);white-space:nowrap;
}
.zk-nav-toggle{display:none}
.zk-nav{display:block;flex:1 1 auto;min-width:0}
.zk-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.zk-nav__link{
  display:inline-flex;align-items:center;
  padding:9px 11px;border-radius:var(--r-pill);
  font-size:13.5px;line-height:1.3;color:#b9c4cf;
  transition:background-color .15s ease,color .15s ease,box-shadow .15s ease;
}
.zk-nav__link:hover{background:rgba(14,74,82,.85);color:var(--ivory)}
.zk-nav__link[aria-current="page"]{
  background:rgba(14,74,82,.95);
  color:var(--cyan);
  box-shadow:inset 0 0 0 1px rgba(49,230,214,.30);
}
.zk-header__cta{flex:0 0 auto;white-space:nowrap}
.zk-header__note{
  margin:9px 4px 0;
  color:var(--ash);
  text-align:right;
}
.zk-header__note .zk-mono{font-size:11px;letter-spacing:.08em}

/* ---------- 按钮与标签 ---------- */
.zk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:14px;font-weight:600;line-height:1.2;letter-spacing:.01em;
  cursor:pointer;
  transition:background-color .16s ease,border-color .16s ease,color .16s ease,transform .16s ease;
}
.zk-btn--signal{background:var(--signal);color:var(--ink-900)}
.zk-btn--signal:hover{background:#ff8047;transform:translateY(-1px)}
.zk-btn--ghost{background:rgba(18,50,71,.42);border-color:var(--line-strong);color:var(--ivory)}
.zk-btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.zk-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 13px;border-radius:var(--r-pill);
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;
  color:var(--ash);
}
.zk-chip--amber{color:var(--amber);border-color:rgba(242,184,75,.36);background:rgba(242,184,75,.08)}
.zk-chip--cyan{color:var(--cyan);border-color:rgba(49,230,214,.34);background:rgba(49,230,214,.08)}
.zk-tag{
  display:inline-flex;align-items:center;
  padding:3px 10px;border-radius:var(--r-pill);
  background:rgba(14,74,82,.72);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:#bcd6da;
}
.zk-link{color:var(--cyan);border-bottom:1px solid rgba(49,230,214,.35);transition:border-color .15s ease,color .15s ease}
.zk-link:hover{color:#7ff3e8;border-color:var(--cyan)}
.zk-mono{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;font-variant-numeric:tabular-nums}

/* ---------- 容器与节奏 ---------- */
.zk-container{width:min(100% - var(--gutter) * 2,var(--max));margin-inline:auto}
.zk-section{padding-block:clamp(46px,7vw,92px);position:relative;z-index:1}
.zk-section--tight{padding-block:clamp(28px,4vw,52px)}
.zk-stack{display:grid;gap:clamp(14px,2vw,22px);align-content:start}
.zk-grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.zk-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.zk-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.zk-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.zk-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.10em;
  color:var(--ash);
}
.zk-eyebrow::before{content:"";width:26px;height:1px;background:var(--cyan);opacity:.75}
.zk-title{
  font-family:var(--font-display);
  font-size:clamp(34px,5.4vw,64px);
  font-weight:800;line-height:1.04;letter-spacing:-.03em;
  color:var(--ivory);
}
.zk-title--md{
  font-family:var(--font-display);
  font-size:clamp(26px,3.2vw,36px);
  font-weight:700;line-height:1.16;letter-spacing:-.02em;
  color:var(--ivory);
}
.zk-lede{font-size:clamp(16px,1.3vw,18px);line-height:1.78;color:#c3ccd6;max-width:60ch}
.zk-panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--r-xl);
  padding:clamp(18px,2.6vw,30px);
}
.zk-rule{height:1px;background:var(--line);border:0;margin:0}
.zk-scale{
  height:22px;
  border-bottom:1px solid var(--line-strong);
  background-image:repeating-linear-gradient(90deg,rgba(233,237,242,.26) 0 1px,transparent 1px 26px);
  background-repeat:repeat-x;
  background-position:left bottom;
  background-size:auto 9px;
}
.zk-list{display:grid;gap:10px}
.zk-list li{position:relative;padding-left:18px;color:#c3ccd6}
.zk-list li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:7px;height:1px;background:var(--cyan);opacity:.7;
}
.zk-breadcrumb{margin-bottom:clamp(18px,3vw,30px)}
.zk-breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--ash)}
.zk-breadcrumb__list a{color:#a8b4bf;transition:color .15s ease}
.zk-breadcrumb__list a:hover{color:var(--cyan)}
.zk-breadcrumb__sep{color:rgba(138,143,152,.6)}

/* ---------- 图片容器 ---------- */
.zk-figure{display:block}
.zk-figure__frame{
  position:relative;overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--ink-700);
  aspect-ratio:16/9;
}
.zk-figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(233,237,242,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(233,237,242,.06) 1px,transparent 1px);
  background-size:44px 44px;
  mix-blend-mode:screen;opacity:.55;
}
.zk-figure__img{width:100%;height:100%;object-fit:cover;transition:filter .2s ease}
.zk-figure:hover .zk-figure__img{filter:brightness(1.08)}
.zk-figure__cap{margin-top:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--ash)}
.zk-figure--wide .zk-figure__frame{aspect-ratio:21/9}
.zk-figure--tall .zk-figure__frame{aspect-ratio:4/5}
.zk-figure--square .zk-figure__frame{aspect-ratio:1/1}

/* ---------- 页脚 ---------- */
.zk-footer{
  position:relative;z-index:1;
  margin-top:clamp(56px,8vw,110px);
  padding:clamp(30px,4vw,52px) 0 clamp(24px,3vw,36px);
  background:linear-gradient(180deg,rgba(11,34,51,0),rgba(11,34,51,.92) 34%,var(--ink-800) 100%);
  border-top:1px solid var(--line);
}
.zk-footer__scale{
  height:24px;margin-bottom:clamp(22px,3vw,38px);
  border-bottom:1px solid var(--line-strong);
  background-image:repeating-linear-gradient(90deg,rgba(233,237,242,.24) 0 1px,transparent 1px 26px);
  background-repeat:repeat-x;
  background-position:left bottom;
  background-size:auto 10px;
}
.zk-footer__grid{
  display:grid;
  grid-template-columns:1.5fr .85fr 1.3fr .85fr;
  gap:clamp(22px,3vw,42px);
}
.zk-footer__brand{display:grid;gap:12px;align-content:start}
.zk-footer__logo{
  font-family:var(--font-display);
  font-size:22px;font-weight:800;letter-spacing:-.02em;color:var(--ivory);
}
.zk-footer__line{font-size:14px;line-height:1.7;color:#b3bec9;max-width:34ch}
.zk-footer__version{justify-self:start}
.zk-footer__note{font-size:12.5px;line-height:1.7;color:var(--ash);max-width:38ch}
.zk-footer__col{display:grid;gap:12px;align-content:start}
.zk-footer__head{
  font-family:var(--font-mono);font-size:11.5px;font-weight:400;
  letter-spacing:.10em;color:var(--ash);
  padding-bottom:10px;border-bottom:1px solid var(--line);
}
.zk-footer__list{display:grid;gap:9px}
.zk-footer__list a{
  font-size:13.5px;color:#b9c4cf;
  transition:color .15s ease;
}
.zk-footer__list a:hover{color:var(--cyan)}
.zk-footer__list--data li{display:grid;gap:1px;font-size:13.5px;color:#c3ccd6;line-height:1.65}
.zk-footer__key{font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;color:var(--ash)}
.zk-footer__meta{
  display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:space-between;align-items:center;
  margin-top:clamp(26px,3.5vw,44px);
  padding-top:16px;border-top:1px solid var(--line);
  color:var(--ash);
}
.zk-footer__meta .zk-mono{font-size:11.5px}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .zk-brand__tag{display:none}
  .zk-nav__link{padding:9px 9px;font-size:13px}
  .zk-header__note{display:none}
}
@media (max-width:980px){
  .zk-header{padding:10px clamp(10px,3vw,20px) 0}
  .zk-pill{padding:7px 8px 7px 12px;gap:10px;justify-content:space-between}
  .zk-nav-toggle{
    display:inline-flex;align-items:center;gap:8px;
    padding:9px 14px;border-radius:var(--r-pill);
    border:1px solid var(--line-strong);
    background:rgba(18,50,71,.5);
    font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--ivory);
    cursor:pointer;
  }
  .zk-nav-toggle__bars{display:inline-flex;flex-direction:column;gap:5px;width:16px}
  .zk-nav-toggle__bars span{display:block;height:2px;width:16px;background:var(--ivory);border-radius:2px;transition:transform .16s ease,opacity .16s ease}
  .zk-header[data-open="true"] .zk-nav-toggle{border-color:rgba(49,230,214,.4);color:var(--cyan)}
  .zk-header[data-open="true"] .zk-nav-toggle__bars span{background:var(--cyan)}
  .zk-header[data-open="true"] .zk-nav-toggle__bars span:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
  .zk-header[data-open="true"] .zk-nav-toggle__bars span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}
  .zk-nav{
    display:none;
    position:absolute;top:calc(100% + 10px);left:0;right:0;z-index:70;
    background:rgba(11,34,51,.98);
    border:1px solid var(--line-strong);
    border-radius:20px;
    padding:10px;
    box-shadow:0 30px 64px rgba(0,0,0,.55);
  }
  .zk-header[data-open="true"] .zk-nav{display:block}
  .zk-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .zk-nav__link{border-radius:var(--r-md);padding:12px 14px;font-size:15px;width:100%}
  .zk-header__cta{display:none}
  .zk-grid--3,.zk-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .zk-footer__grid{grid-template-columns:1.2fr 1fr}
  .zk-footer__brand{grid-column:1 / -1}
}
@media (max-width:640px){
  body{font-size:16px}
  .zk-grid--2,.zk-grid--3,.zk-grid--4{grid-template-columns:minmax(0,1fr)}
  .zk-footer__grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .zk-footer__brand{grid-column:auto}
  .zk-footer__meta{flex-direction:column;align-items:flex-start;gap:6px}
  .zk-figure__frame{aspect-ratio:4/3}
  .zk-figure--wide .zk-figure__frame{aspect-ratio:16/9}
  .zk-title{font-size:clamp(30px,8.4vw,40px)}
  .zk-btn{padding:11px 18px;font-size:13.5px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .zk-btn--signal:hover{transform:none}
  .zk-figure:hover .zk-figure__img{filter:none}
}