/* ========== reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
a{color:inherit}
[id]{scroll-margin-top:132px}

/* ========== tokens ========== */
:root{
  --ink-900:#071A33;
  --ink-800:#062F5C;
  --blue:#0B4A8F;
  --silver:#C9D2DC;
  --mist:#EEF2F6;
  --paper:#F8FAFC;
  --orange:#F07A2A;
  --orange-deep:#C85A12;
  --graphite:#1E2A38;
  --cyan:#1FB6C9;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","SFMono-Regular","Cascadia Mono",Consolas,"Liberation Mono","Courier New",monospace;
  --shell:1280px;
  --gutter:24px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ========== base type ========== */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--graphite);
  background:var(--mist);
  min-height:100vh;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.15;letter-spacing:-.02em;color:var(--ink-900)}
h1{font-size:clamp(34px,6vw,68px)}
h2{font-size:clamp(26px,3.6vw,44px)}
h3{font-size:clamp(20px,2.2vw,26px)}
p{max-width:72ch}
strong{font-weight:800}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px}

/* ========== skip link ========== */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:500;
  transform:translateY(-220%);
  background:var(--orange);color:var(--ink-900);
  font-size:14px;font-weight:800;letter-spacing:.04em;
  padding:10px 18px;border:2px solid var(--ink-900);border-radius:2px;
  text-decoration:none;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ========== 命令栏 ========== */
.cmd-bar{
  position:sticky;top:0;z-index:200;
  background:var(--ink-900);
  color:var(--silver);
  border-bottom:2px solid var(--blue);
}
.cmd-inner{
  width:min(var(--shell),100% - 48px);
  margin-inline:auto;
  display:flex;align-items:center;gap:20px;
}
.cmd-bar__top{
  background:#04101F;
  border-bottom:1px solid rgba(201,210,220,.14);
}
.cmd-bar__top .cmd-inner{min-height:52px;padding-block:8px;justify-content:space-between}
.cmd-brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:var(--paper)}
.cmd-brand__mark{
  display:grid;place-items:center;width:34px;height:34px;flex:none;
  background:var(--blue);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.04em;
  border:2px solid var(--silver);border-radius:2px;
  box-shadow:3px 3px 0 var(--orange);
}
.cmd-brand__text{display:flex;flex-direction:column;line-height:1.1}
.cmd-brand__name{font-size:16px;font-weight:900;letter-spacing:.03em}
.cmd-brand__latin{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--silver);text-transform:uppercase;margin-top:3px}
.cmd-tools{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:flex-end}
.cmd-status{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--cyan);background:rgba(31,182,201,.1);
  border:1px solid rgba(31,182,201,.55);border-radius:2px;
  padding:4px 8px;white-space:nowrap;
}
.cmd-lang{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--silver);text-transform:uppercase;white-space:nowrap;
}
.cmd-bar__nav{background:linear-gradient(180deg,var(--ink-900),#051A33)}
.cmd-bar__nav .cmd-inner{position:relative;min-height:56px;padding-block:0;justify-content:space-between;gap:16px}

/* ========== 导航 ========== */
.cmd-nav{display:block}
.cmd-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.cmd-nav__link{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;text-decoration:none;
  color:var(--silver);font-size:13px;font-weight:700;letter-spacing:.06em;
  border-left:3px solid transparent;border-radius:2px;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.cmd-nav__link:hover{color:var(--paper);background:rgba(201,210,220,.1)}
.cmd-nav__index{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:var(--cyan);opacity:.85}
.cmd-nav__link[aria-current="page"]{
  background:var(--blue);color:var(--paper);
  border-left-color:var(--orange);
  box-shadow:inset 0 0 0 1px rgba(248,250,252,.16);
}
.cmd-nav__link[aria-current="page"] .cmd-nav__index{color:var(--orange);opacity:1}

/* ========== 坐标条 ========== */
.rail{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  font-size:11px;letter-spacing:.12em;line-height:1.4;
  color:var(--silver);
  padding:6px 10px;border:1px solid rgba(201,210,220,.22);border-radius:2px;
  background:rgba(4,16,31,.55);white-space:nowrap;
}
.rail__seg{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--orange)}
.rail__sep{color:rgba(201,210,220,.4)}
.rail__label{font-weight:800;color:var(--paper);letter-spacing:.08em}
.rail__path{font-family:var(--font-mono);font-size:11px;letter-spacing:.02em;color:var(--silver)}

/* ========== 移动导航按钮 ========== */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:transparent;color:var(--paper);
  border:2px solid var(--silver);border-radius:2px;
  padding:8px 12px;cursor:pointer;
  font-size:12px;font-weight:800;letter-spacing:.14em;
  transition:background-color .16s var(--ease),border-color .16s var(--ease);
}
.nav-toggle__bars{
  display:block;width:18px;height:2px;background:var(--orange);
  box-shadow:0 -6px 0 var(--orange),0 6px 0 var(--orange);
  transition:box-shadow .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--paper)}
.nav-toggle[aria-expanded="true"]{background:var(--blue);border-color:var(--orange)}
.nav-toggle__text{white-space:nowrap}

/* ========== 滚动进度 ========== */
.progress{height:3px;background:rgba(201,210,220,.14)}
.progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--orange));transition:width .1s linear}

/* ========== 页脚 ========== */
.site-foot{
  position:relative;
  background:var(--ink-900);
  color:var(--silver);
  margin-top:0;
}
.site-foot::before{
  content:"";display:block;height:8px;
  background:linear-gradient(90deg,var(--blue) 0 55%,var(--orange) 55% 68%,var(--cyan) 68% 78%,var(--silver) 78% 100%);
}
.foot-band{border-bottom:1px solid rgba(201,210,220,.16)}
.foot-band--main{padding:56px 0 44px}
.foot-band--node{padding:22px 0;background:#051424}
.foot-inner{width:min(var(--shell),100% - 48px);margin-inline:auto}
.foot-grid{display:grid;grid-template-columns:1.5fr repeat(4,minmax(0,1fr));gap:32px}
.foot-brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--paper)}
.foot-brand__mark{
  display:grid;place-items:center;width:30px;height:30px;flex:none;
  background:var(--blue);border:2px solid var(--silver);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  box-shadow:3px 3px 0 var(--orange);
}
.foot-brand__name{font-size:17px;font-weight:900;letter-spacing:.03em}
.foot-lockup__latin{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:rgba(201,210,220,.72);text-transform:uppercase;margin-top:12px}
.foot-lockup__status{font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;color:var(--cyan);margin-top:10px}
.foot-lockup__desc{font-size:13.5px;line-height:1.8;color:rgba(201,210,220,.86);max-width:34ch;margin-top:12px}
.foot-lockup .btn{margin-top:20px}
.foot-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--paper);
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid rgba(201,210,220,.24);
}
.foot-list{display:flex;flex-direction:column;gap:9px}
.foot-link{
  display:inline-block;text-decoration:none;font-size:13.5px;line-height:1.6;
  color:rgba(201,210,220,.86);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.foot-link:hover{color:var(--paper);border-bottom-color:var(--orange)}
.foot-list--meta{gap:12px}
.foot-list--meta li{display:flex;flex-direction:column;gap:2px}
.foot-meta__key{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan)}
.foot-meta__val{font-size:13px;line-height:1.7;color:rgba(201,210,220,.9);word-break:break-word}
.foot-node{display:flex;align-items:center;gap:20px;flex-wrap:wrap;justify-content:space-between}
.foot-node__title{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--orange);white-space:nowrap;
}
.foot-node__title::before{content:"";display:block;width:10px;height:10px;background:var(--cyan);transform:rotate(45deg);flex:none}
.foot-node__text{flex:1 1 320px;font-size:13px;line-height:1.7;color:rgba(201,210,220,.8);max-width:60ch}
.foot-legal{background:#04101F;padding:18px 0 26px}
.foot-legal__inner{
  display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:rgba(201,210,220,.72);
}
.foot-legal__copy{max-width:none}
.foot-legal__links{display:flex;flex-wrap:wrap;gap:16px}
.foot-legal__links .foot-link{font-size:12px}
.foot-legal__icp{max-width:none}

/* ========== 通用按钮 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-body);font-size:14px;font-weight:800;letter-spacing:.04em;
  padding:12px 20px;border:2px solid transparent;border-radius:2px;
  text-decoration:none;cursor:pointer;line-height:1.4;
  transition:background-color .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease),transform .16s var(--ease);
}
.btn:active{transform:translate(2px,2px);box-shadow:none}
.btn--accent{
  background:var(--orange);color:var(--ink-900);border-color:var(--ink-900);
  box-shadow:4px 4px 0 rgba(201,210,220,.24);
}
.btn--accent:hover{background:var(--orange-deep);color:var(--paper);border-color:var(--orange-deep);box-shadow:4px 4px 0 rgba(201,210,220,.42)}
.btn--solid{
  background:var(--blue);color:var(--paper);border-color:var(--blue);
  box-shadow:4px 4px 0 rgba(7,26,51,.2);
}
.btn--solid:hover{background:var(--ink-800);border-color:var(--ink-800)}
.btn--line{background:transparent;color:var(--paper);border-color:var(--silver)}
.btn--line:hover{background:var(--silver);color:var(--ink-900)}
.btn--sm{padding:7px 13px;font-size:12px;letter-spacing:.08em;box-shadow:none}
.btn--sm.btn--accent{box-shadow:3px 3px 0 rgba(201,210,220,.22)}
.btn:focus-visible{outline-color:var(--cyan)}

/* ========== 布局容器 ========== */
.container{width:min(var(--shell),100% - 48px);margin-inline:auto}
.container--narrow{width:min(880px,100% - 48px);margin-inline:auto}
.container--wide{width:min(1440px,100% - 48px);margin-inline:auto}
.section{padding-block:clamp(56px,7vw,104px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.stack>*+*{margin-top:var(--gutter)}

/* ========== 章节标记 ========== */
.rule{
  display:block;width:100%;height:8px;border:0;
  background:linear-gradient(90deg,var(--blue) 0 55%,var(--orange) 55% 68%,var(--cyan) 68% 78%,var(--silver) 78% 100%);
}
.sect-mark{
  display:block;line-height:1;
  font-family:var(--font-mono);font-weight:700;font-size:clamp(40px,6vw,72px);
  letter-spacing:-.03em;color:var(--silver);
}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase;color:var(--orange-deep);
}
.kicker::before{content:"";display:block;width:22px;height:2px;background:var(--orange);flex:none}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  padding:3px 8px;border:1px solid var(--silver);border-radius:2px;
  color:var(--blue);background:var(--paper);
}

/* ========== 图例 ========== */
.legend{display:flex;flex-wrap:wrap;gap:16px 22px;align-items:center}
.legend__item{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--graphite);
}
.legend__swatch{display:block;width:12px;height:12px;flex:none;border:2px solid var(--ink-900);border-radius:1px;background:var(--blue)}
.legend__swatch--orange{background:var(--orange)}
.legend__swatch--cyan{background:var(--cyan)}
.legend__swatch--silver{background:var(--silver)}

/* ========== 面包屑 ========== */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:rgba(30,42,56,.72);
}
.crumb a{text-decoration:none;border-bottom:1px solid transparent}
.crumb a:hover{color:var(--blue);border-bottom-color:var(--orange)}
.crumb__sep{color:rgba(30,42,56,.38)}
.crumb [aria-current="page"]{color:var(--blue);font-weight:700}

/* ========== 阅读区 ========== */
.prose{max-width:68ch}
.prose p{font-size:17px;line-height:1.85;color:var(--graphite)}
.prose p+p{margin-top:1.2em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.6em}
.prose ul{list-style:none;display:flex;flex-direction:column;gap:.6em;margin-top:1em}
.prose ul li{position:relative;padding-left:22px}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:8px;background:var(--orange);transform:rotate(45deg)}

/* ========== 图片容器 ========== */
.media-frame{
  position:relative;display:block;overflow:hidden;
  width:100%;aspect-ratio:16/9;
  border:2px solid var(--silver);border-radius:2px;
  background:linear-gradient(140deg,var(--ink-800),var(--ink-900) 58%,var(--blue));
}
.media-frame>img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:12px;
  border:1px solid rgba(201,210,220,.35);
  pointer-events:none;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1}
.media-frame__cap{
  display:block;margin-top:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(30,42,56,.72);
}

/* ========== 分段切换器 ========== */
.tablist{display:flex;flex-wrap:wrap;gap:0;border-bottom:2px solid var(--silver)}
.tab{
  appearance:none;-webkit-appearance:none;
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;margin-bottom:-2px;
  background:transparent;border:2px solid transparent;border-bottom:0;border-radius:2px 2px 0 0;
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.1em;
  color:var(--graphite);cursor:pointer;
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.tab:hover{background:rgba(11,74,143,.08);color:var(--blue)}
.tab[aria-selected="true"]{
  background:var(--ink-900);color:var(--paper);
  border-color:var(--ink-900);
  box-shadow:inset 3px 0 0 var(--orange);
}
.tabpanel{padding-top:24px}
.tabpanel[hidden]{display:none}

/* ========== 显现动效 ========== */
[data-reveal].reveal-pending{
  opacity:0;transform:translateY(12px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
[data-reveal].reveal-pending.is-visible{opacity:1;transform:none}

/* ========== 响应式 ========== */
@media (max-width:1100px){
  .foot-grid{grid-template-columns:1.4fr repeat(2,minmax(0,1fr));gap:32px 28px}
  .foot-lockup{grid-column:1 / -1}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4,.col-5{grid-column:span 3}
  .col-6,.col-7,.col-8,.col-9{grid-column:span 6}
}

@media (max-width:900px){
  .cmd-bar__top .cmd-inner{min-height:44px;padding-block:6px}
  .cmd-bar__nav .cmd-inner{min-height:50px}
  .nav-toggle{display:inline-flex}
  .cmd-nav{
    display:none;
    position:absolute;top:100%;left:0;right:0;z-index:30;
    background:var(--ink-900);
    border:2px solid var(--blue);border-radius:0 0 2px 2px;
    box-shadow:0 14px 0 rgba(7,26,51,.18);
    padding:8px 0 14px;
  }
  .cmd-nav[data-open]{display:block}
  .cmd-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .cmd-nav__link{
    width:100%;padding:14px 16px;border-radius:0;
    border-left-width:4px;font-size:14px;letter-spacing:.04em;
  }
  .cmd-nav__index{font-size:11px}
  .rail{font-size:10px;padding:5px 8px;gap:6px;letter-spacing:.08em}
  .rail__path{font-size:10px}
  .foot-band--main{padding:40px 0 34px}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 24px}
  .foot-lockup{grid-column:1 / -1}
  .foot-node__text{flex:1 1 100%}
  .foot-legal__inner{justify-content:flex-start}
}

@media (max-width:620px){
  .cmd-inner,.foot-inner,.container,.container--narrow,.container--wide{width:min(var(--shell),100% - 32px)}
  .cmd-lang{display:none}
  .cmd-brand__name{font-size:15px}
  .cmd-brand__mark{width:30px;height:30px;font-size:11px;box-shadow:2px 2px 0 var(--orange)}
  .foot-grid{grid-template-columns:minmax(0,1fr)}
  .grid-12{grid-template-columns:minmax(0,1fr)}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9{grid-column:span 1}
  .prose p{font-size:16px}
  .tab{padding:10px 14px;font-size:11px}
  .foot-legal__inner{flex-direction:column;align-items:flex-start;gap:8px}
}

/* ========== 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;
    scroll-behavior:auto !important;
  }
  [data-reveal].reveal-pending{opacity:1;transform:none;transition:none}
  .progress__bar{transition:none}
}