:root{
  --navy:#061A2E;
  --navy-deep:#04121F;
  --panel:#0C2B46;
  --line:#1D4260;
  --line-soft:#2C5877;
  --rock:#8CA0B3;
  --cream:#F2EFE7;
  --white:#FFFFFF;
  --cyan:#35E6C4;
  --signal:#FF6A3D;
  --moss:#6F8F6A;
  --clay:#B66A4E;
  --sand:#D9D2C3;
  --ink:#0B1A26;
  --font-display:"Oswald","Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Noto Serif SC","Songti SC","Source Han Serif SC",Georgia,serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --w:1200px;
  --gutter:clamp(16px,4vw,40px);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  margin:0;
  background-color:var(--navy);
  background-image:
    linear-gradient(to right,rgba(29,66,96,.42) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(29,66,96,.42) 1px,transparent 1px);
  background-size:96px 96px;
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg,canvas{max-width:100%}
img{height:auto}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}

h1,h2,h3,h4{
  margin:0 0 .5em;
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.18;
  letter-spacing:.01em;
  color:var(--white);
}
h1{font-size:clamp(34px,5vw,60px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(19px,2vw,24px)}
h4{font-size:17px;letter-spacing:.04em}
.title-serif{font-family:var(--font-serif);font-weight:700;letter-spacing:0;line-height:1.4}

a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
}
::selection{background:var(--cyan);color:var(--navy)}

.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 16px;
  background:var(--cyan);
  color:var(--navy-deep);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  border-bottom:0;
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0);border-bottom:0;color:var(--navy-deep)}

/* ============ HEADER ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--navy);
  border-bottom:1px solid var(--line);
}
.header-rail{
  background:var(--navy-deep);
  border-bottom:1px solid var(--line);
}
.rail-inner{
  max-width:var(--w);
  margin:0 auto;
  padding:7px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--rock);
}
.rail-item{display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.rail-item--center{color:#A9BBC9}
.rail-dot{width:6px;height:6px;background:var(--cyan);display:inline-block;flex:none}

.header-inner{
  max-width:var(--w);
  margin:0 auto;
  padding:clamp(14px,2vw,22px) var(--gutter);
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:18px;
}
.masthead-aside{
  display:flex;
  flex-direction:column;
  gap:3px;
  border-left:2px solid var(--clay);
  padding-left:10px;
}
.aside-coord{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.aside-label{
  font-size:12px;
  letter-spacing:.18em;
  color:var(--rock);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  justify-self:center;
  color:var(--white);
  border-bottom:0;
}
.brand:hover{border-bottom:0;color:var(--white)}
.brand-mark{
  position:relative;
  flex:none;
  width:38px;
  height:38px;
  display:grid;
  place-items:center;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  color:var(--cyan);
  border:1px solid var(--cyan);
  background:rgba(53,230,196,.08);
}
.brand-mark::after{
  content:"";
  position:absolute;
  top:-1px;
  right:-1px;
  width:8px;
  height:8px;
  background:var(--signal);
}
.brand-text{display:flex;flex-direction:column;line-height:1;text-align:left}
.brand-name{
  font-family:var(--font-display);
  font-size:clamp(21px,2.4vw,28px);
  font-weight:700;
  letter-spacing:.16em;
  color:var(--white);
  transition:color .18s ease;
}
.brand:hover .brand-name{color:var(--cyan)}
.brand-cn{
  margin-top:6px;
  font-size:11px;
  letter-spacing:.42em;
  color:var(--rock);
}

.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  justify-self:end;
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  font-family:var(--font-display);
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  line-height:1;
  text-decoration:none;
  border:1px solid transparent;
  border-bottom:1px solid transparent;
  border-radius:0;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{border-bottom-width:1px}
.btn--signal{
  background:var(--signal);
  color:var(--ink);
  border-color:var(--signal);
}
.btn--signal:hover{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--navy-deep);
}
.btn--ghost{
  background:transparent;
  color:var(--cream);
  border-color:var(--line);
}
.btn--ghost:hover{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(53,230,196,.06);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:0;
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  line-height:1;
  cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:5px;width:16px;flex:none}
.nav-toggle-bars i{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.nav-row{
  border-top:1px solid var(--line);
  background:var(--panel);
}
.primary-nav{
  max-width:var(--w);
  margin:0 auto;
  padding:0 var(--gutter);
}
.nav-list{
  display:flex;
  justify-content:center;
  align-items:stretch;
  gap:clamp(6px,2.6vw,34px);
}
.nav-link{
  display:block;
  padding:13px 2px 11px;
  font-size:14px;
  letter-spacing:.1em;
  color:#DCE4EA;
  border-bottom:2px solid transparent;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.nav-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.nav-link[aria-current="page"]{
  color:var(--white);
  border-bottom-color:var(--signal);
}
.nav-link:focus-visible{outline-offset:-2px}

.progress-track{height:2px;background:var(--line)}
.progress-bar{
  display:block;
  height:100%;
  width:100%;
  background:linear-gradient(90deg,var(--cyan),var(--signal));
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ============ FOOTER ============ */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--navy);
  border-top:1px solid var(--line);
}
.footer-rail{
  background-color:var(--panel);
  background-image:repeating-linear-gradient(90deg,rgba(29,66,96,.55) 0 1px,transparent 1px 28px);
  border-bottom:1px solid var(--line);
}
.footer-rail-inner{
  max-width:var(--w);
  margin:0 auto;
  padding:8px var(--gutter);
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px 18px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--rock);
}
.footer-panel{
  max-width:var(--w);
  margin:0 auto;
  padding:clamp(36px,5vw,64px) var(--gutter);
  display:grid;
  grid-template-columns:minmax(0,1.4fr) minmax(0,.75fr) minmax(0,.75fr) minmax(0,1.1fr);
  gap:clamp(24px,3.4vw,52px);
  border-bottom:1px solid var(--line);
}
.footer-brand{min-width:0}
.footer-wordmark{
  margin:0 0 14px;
  font-family:var(--font-display);
  font-size:clamp(20px,2.2vw,26px);
  font-weight:700;
  letter-spacing:.18em;
  line-height:1.1;
  color:var(--white);
}
.footer-wordmark span{
  display:block;
  margin-top:7px;
  font-family:var(--font-body);
  font-size:11px;
  font-weight:500;
  letter-spacing:.42em;
  color:var(--rock);
}
.footer-summary{
  margin:0 0 14px;
  max-width:34ch;
  font-size:15px;
  line-height:1.8;
  color:#CBD6DF;
}
.footer-meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--rock);
}
.footer-group{min-width:0}
.footer-group-label{
  margin:0 0 14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--rock);
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{
  font-size:14px;
  color:var(--cream);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-channels{min-width:0}
.channel-list{display:flex;flex-direction:column;gap:12px}
.channel-list li{
  display:grid;
  grid-template-columns:64px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
}
.channel-key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--rock);
}
.channel-val{
  font-size:14px;
  line-height:1.65;
  color:var(--cream);
  overflow-wrap:anywhere;
}
.channel-val--mono{font-family:var(--font-mono);letter-spacing:.01em}
.footer-legal{
  max-width:var(--w);
  margin:0 auto;
  padding:18px var(--gutter) 28px;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--rock);
}
.footer-credit{margin:0;color:var(--rock)}
.legal-note{
  margin:0;
  max-width:56ch;
  line-height:1.7;
  color:#6E8497;
}

/* ============ 通用内容组件 ============ */
#main-content{display:block;scroll-margin-top:140px}
.shell{
  width:100%;
  max-width:var(--w);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.section-band{
  position:relative;
  padding:clamp(40px,6vw,80px) 0;
}
.section-band--panel{background:var(--panel);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-band--sand{background:var(--sand);color:var(--ink)}
.section-band--sand h1,.section-band--sand h2,.section-band--sand h3{color:var(--ink)}

.panel{
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(20px,3vw,32px);
  min-width:0;
  transition:border-color .18s ease,background-color .18s ease;
}
.panel--flat{background:transparent}
.panel:hover{border-color:var(--line-soft)}
.panel-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px 20px;
  margin-bottom:18px;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
.panel-title{
  margin:0;
  font-family:var(--font-display);
  font-size:clamp(19px,2vw,24px);
  letter-spacing:.04em;
  color:var(--white);
}
.panel-sub{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--rock);
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.kicker::before{
  content:"";
  width:14px;
  height:2px;
  background:var(--signal);
  display:inline-block;
  flex:none;
}
.coord{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--rock);
}
.lede{
  max-width:62ch;
  font-size:clamp(16px,1.3vw,18px);
  line-height:1.9;
  color:#DDE6EC;
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}

.breadcrumb{
  padding:14px 0;
  border-bottom:1px solid var(--line);
  background:rgba(12,43,70,.55);
}
.crumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
}
.crumb-link{
  color:var(--rock);
  border-bottom:1px solid transparent;
}
.crumb-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.crumb-sep{color:var(--line-soft)}
.crumb-current{color:var(--cream)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.5;
  border:1px solid var(--line);
  color:var(--rock);
  background:transparent;
}
.tag--signal{border-color:var(--signal);color:var(--signal)}
.tag--cyan{border-color:var(--cyan);color:var(--cyan)}
.tag--moss{border-color:var(--moss);color:#A9C4A4}

.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
}
.data-table th,
.data-table td{
  padding:12px 14px;
  border-bottom:1px solid var(--line);
  text-align:left;
  vertical-align:top;
}
.data-table th{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--rock);
}
.data-table td{color:var(--cream)}
.data-table tbody tr:hover{background:rgba(53,230,196,.05)}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.span-4{grid-column:span 4;min-width:0}
.span-5{grid-column:span 5;min-width:0}
.span-6{grid-column:span 6;min-width:0}
.span-7{grid-column:span 7;min-width:0}
.span-8{grid-column:span 8;min-width:0}

.media-frame{
  position:relative;
  display:block;
  margin:0;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  background:linear-gradient(140deg,var(--panel),#0A2136 55%,#123A55);
}
.media-frame img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--cut{
  clip-path:polygon(0 0,100% 0,100% calc(100% - 28px),calc(100% - 28px) 100%,0 100%);
}
.media-frame figcaption{
  position:absolute;
  left:0;
  bottom:0;
  padding:8px 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cream);
  background:rgba(4,18,31,.82);
}

.toc{display:flex;flex-direction:column;gap:2px}
.toc-link{
  display:block;
  padding:8px 0 8px 12px;
  border-left:2px solid var(--line);
  font-size:14px;
  color:var(--rock);
  transition:color .18s ease,border-color .18s ease;
}
.toc-link:hover{color:var(--cyan);border-left-color:var(--cyan);border-bottom-color:transparent}
.toc-link[aria-current="true"]{
  color:var(--white);
  border-left-color:var(--signal);
  background:rgba(255,106,61,.06);
}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .footer-panel{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .span-4,.span-5,.span-7{grid-column:span 6}
}
@media (max-width:900px){
  .span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 12}
}
@media (max-width:860px){
  .header-inner{
    grid-template-columns:auto minmax(0,1fr);
    gap:12px;
    padding:14px var(--gutter);
  }
  .masthead-aside{display:none}
  .brand{justify-self:start}
  .header-actions{justify-self:end}
  .nav-toggle{display:inline-flex}
  .btn--signal{padding:9px 12px;font-size:12px;letter-spacing:.06em}
  .rail-item--center{display:none}
  .primary-nav{
    max-height:0;
    overflow:hidden;
    padding:0;
    transition:max-height .22s ease;
  }
  .primary-nav[data-open="true"]{
    max-height:80vh;
    overflow-y:auto;
  }
  .nav-list{flex-direction:column;gap:0;padding:4px 0}
  .nav-link{
    padding:15px var(--gutter);
    border-bottom:1px solid var(--line);
    border-left:2px solid transparent;
  }
  .nav-link:hover{
    border-bottom-color:var(--line);
    border-left-color:var(--cyan);
    background:rgba(53,230,196,.06);
  }
  .nav-link[aria-current="page"]{
    border-bottom-color:var(--line);
    border-left-color:var(--signal);
    background:rgba(255,106,61,.08);
  }
  .footer-panel{padding-left:var(--gutter);padding-right:var(--gutter)}
  #main-content{scroll-margin-top:110px}
}
@media (max-width:640px){
  body{font-size:15px}
  .footer-panel{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column}
  .channel-list li{grid-template-columns:56px minmax(0,1fr)}
  .media-frame--wide{aspect-ratio:16/10}
}
@media (max-width:420px){
  .btn--signal{padding:8px 10px;font-size:11px;letter-spacing:.04em}
  .nav-toggle-text{display:none}
  .brand-mark{width:34px;height:34px;font-size:12px}
  .brand-cn{letter-spacing:.3em}
}

@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .skip-link{transition:none}
  .progress-bar{transition:none}
}