:root{
  --ink:#0A1A2F;
  --ink-2:#12294A;
  --mist:#D7DEE8;
  --silver:#EFF3F8;
  --paper:#FCFDFF;
  --signal:#FF6B2C;
  --cyan:#16C2C8;
  --cyan-ink:#0B6E77;
  --amber:#F4A63B;
  --text:#0F1B2D;
  --muted:#55657E;

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular","Menlo",monospace;

  --shell:1320px;
  --gutter:20px;
  --radius:3px;
  --line:1px solid var(--mist);
  --line-dark:1px solid rgba(215,222,232,.18);
  --shadow-panel:0 1px 0 rgba(10,26,47,.05), 0 18px 42px -34px rgba(10,26,47,.75);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{ margin:0; }
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{ margin:0; }
ul,ol{ margin:0; padding:0; list-style:none; }
img,svg,video{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
button,input,select,textarea{ font:inherit; color:inherit; }
button{ background:none; border:0; cursor:pointer; }
table{ border-collapse:collapse; width:100%; }
:focus-visible{ outline:2px solid var(--signal); outline-offset:2px; border-radius:2px; }
[id]{ scroll-margin-top:96px; }

/* ---------- 2. 中文排版基线 ---------- */
body{
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.8;
  font-weight:400;
  letter-spacing:.01em;
  color:var(--text);
  background:var(--silver);
  background-image:linear-gradient(180deg,#F6F9FC 0%,var(--silver) 46%,#E8EEF6 100%);
  background-attachment:fixed;
}
.display-1{
  font-family:var(--font-display);
  font-size:clamp(40px,6vw,88px);
  line-height:1.02;
  font-weight:300;
  letter-spacing:.015em;
  text-transform:uppercase;
  color:var(--paper);
}
.display-2{
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,40px);
  line-height:1.12;
  font-weight:300;
  letter-spacing:.02em;
  color:var(--ink);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,40px);
  line-height:1.14;
  font-weight:300;
  letter-spacing:.02em;
  color:var(--ink);
}
.index-label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
}
.index-label--mist{ color:var(--mist); }
.prose{ max-width:38em; }
.prose p{ max-width:36em; }
.prose p + p{ margin-top:14px; }
.prose h2,.prose h3{ margin-top:36px; margin-bottom:12px; }
.prose ul{ margin-top:12px; }
.prose ul li{ position:relative; padding-left:16px; }
.prose ul li + li{ margin-top:8px; }
.prose ul li::before{
  content:""; position:absolute; left:0; top:.82em;
  width:6px; height:6px; border:1px solid var(--cyan);
}
.prose strong{ font-weight:600; color:var(--ink); }

/* ---------- 3. 版式容器与网格 ---------- */
.shell{ width:min(var(--shell),100% - var(--gutter) * 2); margin-inline:auto; }
.shell--wide{ width:min(1440px,100% - var(--gutter) * 2); }
.shell--narrow{ width:min(880px,100% - var(--gutter) * 2); }
.grid-12{ display:grid; grid-template-columns:repeat(12,minmax(0,1fr)); gap:var(--gutter); }
.split{
  display:grid;
  grid-template-columns:minmax(0,5fr) minmax(0,7fr);
  gap:44px;
  align-items:start;
}
.split--reverse{ grid-template-columns:minmax(0,7fr) minmax(0,5fr); }
.rail{ position:sticky; top:96px; }
#main-content{ display:block; padding-bottom:8px; }
.mt-16{ margin-top:16px; }
.mt-24{ margin-top:24px; }
.mt-32{ margin-top:32px; }
.mt-48{ margin-top:48px; }

/* ---------- 4. 页头 ---------- */
.skip-link{
  position:fixed; top:0; left:50%; z-index:200;
  transform:translate(-50%,-130%);
  background:var(--signal); color:#fff;
  padding:10px 18px; font-size:13px; letter-spacing:.06em;
  border-radius:0 0 var(--radius) var(--radius);
  transition:transform .2s var(--ease);
}
.skip-link:focus{ transform:translate(-50%,0); outline:none; }

.site-header{
  position:sticky; top:0; z-index:80;
  background:var(--ink);
  background-image:linear-gradient(120deg,#0A1A2F 0%,#0E2440 52%,#0A1A2F 100%);
  color:var(--paper);
  border-bottom:var(--line-dark);
}
.site-header::before{
  content:""; position:absolute; inset:auto 0 100% 0; height:120px;
  pointer-events:none;
}
.header-rail{
  width:min(1400px,100% - 32px);
  margin-inline:auto;
  padding:12px 0;
  display:flex; flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:18px;
}
.site-header :focus-visible{ outline-color:var(--cyan); }

.brand-block{ display:flex; align-items:center; gap:14px; min-width:0; }
.brand-mark{
  font-family:var(--font-display);
  font-size:30px; font-weight:600;
  letter-spacing:.2em; text-transform:uppercase;
  line-height:1; color:var(--paper);
  padding-right:14px;
  border-right:1px solid rgba(215,222,232,.26);
  transition:color .18s var(--ease);
}
.brand-mark:hover{ color:var(--cyan); }
.brand-line{
  font-size:12px; letter-spacing:.18em; text-transform:uppercase;
  color:var(--mist); white-space:nowrap;
}
.brand-meta{ display:flex; align-items:center; gap:10px; }
.version-badge{
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.04em;
  color:#04212B; background:var(--cyan);
  padding:3px 8px; border-radius:2px; white-space:nowrap;
}
.sub-status{
  display:inline-flex; align-items:center; gap:7px;
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.04em;
  color:var(--mist); white-space:nowrap;
}
.sub-status::before{
  content:""; width:7px; height:7px; border-radius:50%; flex:none;
  background:var(--mist);
  box-shadow:0 0 0 3px rgba(215,222,232,.14);
  transition:background .2s var(--ease), box-shadow .2s var(--ease);
}
.sub-status[data-state="on"]{ color:var(--cyan); }
.sub-status[data-state="on"]::before{
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(22,194,200,.22);
}

.main-nav{ display:flex; align-items:center; gap:24px; }
.nav-list{ display:flex; align-items:center; gap:2px; flex-wrap:wrap; }
.nav-list a{
  position:relative; display:block;
  padding:9px 12px;
  font-size:13.5px; letter-spacing:.06em;
  color:var(--mist);
  transition:color .18s var(--ease);
}
.nav-list a::after{
  content:""; position:absolute; left:12px; right:12px; bottom:3px; height:2px;
  background:var(--signal);
  transform:scaleX(0); transform-origin:left;
  transition:transform .24s var(--ease);
}
.nav-list a:hover{ color:var(--paper); }
.nav-list a:hover::after{ transform:scaleX(1); }
.nav-list a[aria-current="page"]{ color:var(--paper); }
.nav-list a[aria-current="page"]::after{ transform:scaleX(1); }
.nav-list a[aria-current="page"]::before{
  content:""; position:absolute; left:2px; top:8px;
  width:5px; height:5px; border-radius:50%;
  background:var(--signal);
}

.nav-utility{
  display:flex; align-items:center; gap:10px;
  padding-left:18px;
  border-left:var(--line-dark);
}
.nav-quick{
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.08em;
  color:var(--mist); padding:7px 2px;
  border-bottom:1px dashed rgba(215,222,232,.36);
  transition:color .18s var(--ease), border-color .18s var(--ease);
}
.nav-quick:hover{ color:var(--cyan); border-bottom-color:var(--cyan); }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:9px 16px;
  font-size:13.5px; letter-spacing:.06em; line-height:1.4;
  border:1px solid transparent; border-radius:var(--radius);
  white-space:nowrap; cursor:pointer;
  transition:background .18s var(--ease), color .18s var(--ease),
             border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:active{ transform:translateY(1px); }
.btn-signal{ background:var(--signal); color:#fff; font-weight:500; }
.btn-signal:hover{ background:#FF8347; }
.btn-ghost{ color:var(--mist); border-color:rgba(215,222,232,.42); }
.btn-ghost:hover{ color:var(--paper); border-color:var(--cyan); }
.btn-line{ color:var(--signal); border-color:var(--signal); }
.btn-line:hover{ background:var(--signal); color:#fff; }
.btn-quiet{ color:var(--muted); border-color:rgba(85,101,126,.36); }
.btn-quiet:hover{ color:var(--ink); border-color:var(--ink); }
.btn-silver{ background:var(--paper); color:var(--ink); border-color:var(--mist); }
.btn-silver:hover{ border-color:var(--cyan); color:var(--cyan-ink); }

.nav-toggle{
  display:none; align-items:center; gap:9px;
  padding:8px 12px;
  border:1px solid rgba(215,222,232,.42); border-radius:var(--radius);
  color:var(--mist);
  font-family:var(--font-mono); font-size:11.5px;
  letter-spacing:.14em; text-transform:uppercase;
  transition:border-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover{ color:var(--paper); border-color:var(--cyan); }
.nav-toggle-bars{ position:relative; display:block; width:16px; height:10px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:""; position:absolute; left:0; width:16px; height:1.5px;
  background:currentColor;
  transition:transform .2s var(--ease), top .2s var(--ease), bottom .2s var(--ease);
}
.nav-toggle-bars::before{ top:0; }
.nav-toggle-bars::after{ bottom:0; }
.site-header[data-open] .nav-toggle-bars::before{ top:4px; transform:rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after{ bottom:5px; transform:rotate(-45deg); }

.progress-track{
  position:relative; height:3px;
  background:rgba(215,222,232,.14);
  overflow:hidden;
}
.progress-bar{
  display:block; height:100%; width:0;
  background:linear-gradient(90deg,var(--cyan),var(--signal));
}

/* ---------- 5. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:80px;
  color:var(--mist);
  background:var(--ink);
  background-image:linear-gradient(178deg,#0A1A2F 0%,#0B1F38 60%,#0A1A2F 100%);
  border-top:var(--line-dark);
}
.site-footer::before{
  content:""; position:absolute; top:-1px; left:0; right:0; height:1px;
  background:linear-gradient(90deg,transparent,rgba(22,194,200,.55),rgba(255,107,44,.4),transparent);
}
.footer-top{
  width:min(1400px,100% - 32px);
  margin-inline:auto;
  padding:56px 0 44px;
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,2fr);
  gap:48px;
}
.footer-brand{ min-width:0; }
.footer-mark{
  display:inline-block;
  font-family:var(--font-display);
  font-size:34px; font-weight:600;
  letter-spacing:.22em; text-transform:uppercase;
  color:var(--paper); line-height:1;
  transition:color .18s var(--ease);
}
.footer-mark:hover{ color:var(--cyan); }
.footer-summary{
  margin-top:14px;
  font-size:14.5px; line-height:1.85;
  color:var(--mist); max-width:30em;
}
.footer-contact{
  margin-top:20px; padding-top:16px;
  border-top:1px dashed rgba(215,222,232,.24);
  display:grid; gap:8px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.04em;
}
.contact-item{ display:flex; gap:10px; align-items:baseline; color:rgba(215,222,232,.86); }
.contact-key{
  flex:none; min-width:5.5em;
  font-size:11px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--cyan);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:32px;
}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:12px; font-weight:500;
  letter-spacing:.18em; text-transform:uppercase;
  color:var(--mist);
  padding-bottom:10px;
  border-bottom:1px solid rgba(215,222,232,.16);
}
.footer-col ul{ margin-top:14px; display:grid; gap:9px; }
.footer-col a{
  display:inline-block;
  padding-left:0;
  font-size:14px; color:rgba(215,222,232,.8);
  border-left:2px solid transparent;
  transition:color .18s var(--ease), padding-left .18s var(--ease), border-color .18s var(--ease);
}
.footer-col a:hover{ color:var(--paper); padding-left:8px; border-left-color:var(--signal); }
.footer-col a[aria-current="page"]{ color:var(--paper); border-left-color:var(--cyan); padding-left:8px; }

.footer-version-strip{
  border-top:1px solid rgba(215,222,232,.14);
  background:rgba(18,41,74,.62);
}
.footer-version-inner{
  width:min(1400px,100% - 32px);
  margin-inline:auto;
  padding:14px 0 18px;
  display:flex; flex-wrap:wrap;
  align-items:center; justify-content:space-between;
  gap:8px 26px;
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.04em;
  color:rgba(215,222,232,.7);
}
.version-strip-code{ color:var(--cyan); }
.version-strip-note{ color:rgba(215,222,232,.62); }
.version-strip-legal{ color:rgba(215,222,232,.74); }

/* ---------- 6. 通用组件 ---------- */
.breadcrumb{ font-family:var(--font-mono); font-size:11.5px; letter-spacing:.06em; }
.breadcrumb ol{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.breadcrumb li{ display:flex; align-items:center; gap:8px; color:var(--muted); }
.breadcrumb li:not(:first-child)::before{ content:"›"; color:var(--mist); }
.breadcrumb a{ color:var(--ink); border-bottom:1px solid transparent; }
.breadcrumb a:hover{ color:var(--signal); border-bottom-color:var(--signal); }

.content-panel{
  position:relative;
  background:var(--paper);
  border:var(--line);
  border-radius:var(--radius);
  padding:28px 30px;
  box-shadow:var(--shadow-panel);
}
.block{
  position:relative;
  background:var(--paper);
  border:var(--line);
  border-radius:var(--radius);
  padding:24px 26px;
  box-shadow:var(--shadow-panel);
}
.block-tag{
  display:inline-flex; align-items:center; gap:8px;
  padding:3px 9px; border-radius:2px;
  font-family:var(--font-mono); font-size:11px;
  letter-spacing:.16em; text-transform:uppercase;
  color:var(--muted);
  background:var(--silver);
  border:1px solid var(--mist);
}
.block-tag--signal{ color:var(--signal); background:rgba(255,107,44,.07); border-color:rgba(255,107,44,.4); }
.block-tag--cyan{ color:var(--cyan-ink); background:rgba(22,194,200,.1); border-color:rgba(11,110,119,.32); }
.block-tag--amber{ color:#8A5A14; background:rgba(244,166,59,.14); border-color:rgba(244,166,59,.48); }

.panel-stack{ position:relative; isolation:isolate; }
.panel-stack > *{ position:relative; z-index:1; }
.panel-stack::before{
  content:""; position:absolute; z-index:0;
  top:10px; left:10px; right:-10px; bottom:-10px;
  border:var(--line);
  border-radius:4px;
  background:linear-gradient(150deg,rgba(22,194,200,.10),rgba(255,107,44,.07));
}

.step-card{
  position:relative;
  background:var(--paper);
  border:var(--line);
  border-radius:var(--radius);
  padding:0;
  transition:border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.step-card:hover{ border-color:rgba(11,110,119,.4); }
.step-card.is-open{ border-color:var(--signal); box-shadow:0 0 0 1px rgba(255,107,44,.28); }
.step-card-head{
  display:flex; align-items:flex-start; gap:14px;
  width:100%; padding:18px 20px; text-align:left;
  border-radius:var(--radius);
}
.step-num{
  flex:none;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.08em;
  color:var(--signal);
  padding:2px 7px; border-radius:2px;
  background:rgba(255,107,44,.07);
  border:1px solid rgba(255,107,44,.35);
}
.step-title{ font-size:16px; font-weight:500; color:var(--ink); line-height:1.6; }
.step-caret{
  flex:none; margin-left:auto;
  width:12px; height:12px; margin-top:7px;
  border-right:1.5px solid var(--muted);
  border-bottom:1.5px solid var(--muted);
  transform:rotate(45deg);
  transition:transform .2s var(--ease), border-color .2s var(--ease);
}
.step-card.is-open .step-caret{ transform:rotate(-135deg); border-color:var(--signal); }
.step-body{
  display:none;
  margin:0 20px 18px;
  padding-top:14px;
  border-top:1px dashed var(--mist);
  font-size:15px; color:var(--muted);
}
.step-body p + p{ margin-top:10px; }
.step-card.is-open .step-body{ display:block; }

.tablist{ display:flex; flex-wrap:wrap; gap:8px; }
.tab{
  font-family:var(--font-mono); font-size:11.5px;
  letter-spacing:.1em; text-transform:uppercase;
  padding:8px 14px; border-radius:2px;
  color:var(--muted); background:var(--paper);
  border:1px solid var(--mist);
  transition:background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.tab:hover{ border-color:var(--cyan); color:var(--cyan-ink); }
.tab[aria-selected="true"]{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.tab-panel{ display:none; }
.tab-panel.is-active{ display:block; }

.index-list{ display:grid; gap:2px; }
.index-list a{
  display:flex; align-items:baseline; gap:12px;
  padding:10px 12px;
  font-size:14.5px; color:var(--muted);
  border-left:2px solid transparent;
  transition:color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
}
.index-list a .num{
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.06em;
  color:var(--mist);
  transition:color .18s var(--ease);
}
.index-list a:hover{ color:var(--ink); background:rgba(215,222,232,.4); }
.index-list a.is-active{
  color:var(--ink);
  border-left-color:var(--signal);
  background:rgba(255,107,44,.07);
}
.index-list a.is-active .num{ color:var(--signal); }

.meter{ height:4px; background:rgba(215,222,232,.5); border-radius:2px; overflow:hidden; }
.meter-fill{
  display:block; height:100%; width:0;
  background:linear-gradient(90deg,var(--cyan),var(--signal));
  transition:width .6s var(--ease);
}

.path-graph{ width:100%; height:auto; overflow:visible; }
.path-line{
  fill:none; stroke:var(--cyan); stroke-width:1.4;
  stroke-dasharray:4 7; opacity:.72;
}
.path-line--signal{ stroke:var(--signal); opacity:.85; }
.path-node circle{ fill:var(--paper); stroke:var(--cyan); stroke-width:1.5; }
.path-node--signal circle{ fill:var(--signal); stroke:var(--signal); }
.path-node text{
  font-family:var(--font-mono); font-size:10px;
  letter-spacing:.06em; fill:var(--muted);
}

.figure{ margin:0; }
.figure-frame{
  position:relative;
  overflow:hidden;
  border:var(--line);
  border-radius:var(--radius);
  background:linear-gradient(150deg,var(--ink-2) 0%,var(--ink) 58%,#0D2340 100%);
  aspect-ratio:16 / 10;
}
.figure-frame--wide{ aspect-ratio:21 / 9; }
.figure-frame--tall{ aspect-ratio:3 / 4; }
.figure-frame--square{ aspect-ratio:1 / 1; }
.figure-frame img,
.figure-frame svg{ width:100%; height:100%; object-fit:cover; }
.figure-frame::after{
  content:""; position:absolute; inset:0; pointer-events:none;
  background-image:
    linear-gradient(rgba(215,222,232,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(215,222,232,.07) 1px,transparent 1px);
  background-size:34px 34px;
}
.figure-caption{
  margin-top:10px;
  font-family:var(--font-mono); font-size:12px; line-height:1.7;
  letter-spacing:.02em; color:var(--muted);
}

[data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .5s var(--ease), transform .5s var(--ease);
}
[data-reveal].is-visible{ opacity:1; transform:none; }

/* ---------- 7. 响应式 ---------- */
@media (max-width:1280px){
  .nav-list a{ padding:9px 9px; font-size:13px; }
  .main-nav{ gap:18px; }
  .nav-utility{ padding-left:12px; gap:8px; }
}
@media (max-width:1180px){
  .brand-line{ display:none; }
}
@media (max-width:1023px){
  .header-rail{ align-items:flex-start; padding-bottom:12px; }
  .nav-toggle{ display:inline-flex; }
  .main-nav{
    display:none;
    flex-basis:100%;
    flex-direction:column;
    align-items:stretch;
    gap:14px;
    padding-top:14px;
    border-top:var(--line-dark);
  }
  .site-header[data-open] .main-nav{ display:flex; }
  .nav-list{ flex-direction:column; align-items:stretch; gap:0; }
  .nav-list a{
    padding:12px 4px;
    font-size:15px;
    border-bottom:1px solid rgba(215,222,232,.1);
  }
  .nav-list a::after{ display:none; }
  .nav-list a[aria-current="page"]{ color:var(--signal); }
  .nav-list a[aria-current="page"]::before{ top:50%; margin-top:-2.5px; }
  .nav-utility{
    flex-wrap:wrap;
    padding-left:0; padding-top:14px;
    border-left:0; border-top:var(--line-dark);
  }
  .nav-quick{ padding:8px 0; }
  .rail{ position:static; }
}
@media (max-width:980px){
  .split,.split--reverse{ grid-template-columns:1fr; gap:28px; }
  .grid-12{ grid-template-columns:repeat(6,minmax(0,1fr)); }
  .footer-top{ grid-template-columns:1fr; gap:34px; padding:44px 0 32px; }
  .footer-cols{ grid-template-columns:repeat(2,minmax(0,1fr)); gap:26px; }
}
@media (max-width:720px){
  body{ font-size:16px; }
  .header-rail{ padding:10px 0 12px; gap:12px; }
  .brand-mark{ font-size:26px; padding-right:10px; }
  .brand-block{ gap:10px; }
  .brand-meta{ gap:8px; }
  .sub-status{ display:none; }
  .version-badge{ font-size:11px; }
  .content-panel,.block{ padding:22px 20px; }
  .step-card-head{ padding:16px; gap:12px; }
  .step-body{ margin:0 16px 16px; }
  .footer-version-inner{ gap:6px 18px; }
}
@media (max-width:520px){
  .footer-cols{ grid-template-columns:1fr; }
  .grid-12{ grid-template-columns:repeat(2,minmax(0,1fr)); }
  .btn{ padding:9px 14px; font-size:13px; }
}

@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]{ opacity:1; transform:none; }
  .meter-fill{ transition:none; }
}