:root{
  --ink-900:#061321;
  --ink-800:#0B1F33;
  --ink-700:#102B45;
  --line:#24405C;
  --cyan:#35E0FF;
  --amber:#FFB648;
  --paper:#EAF3FA;
  --mist:#93AEC4;
  --tag-mfg:#5B8DEF;
  --tag-retail:#E08A5B;
  --tag-logi:#59C3A3;
  --tag-edu:#A98BE8;
  --tag-med:#D97A9A;
  --rail-w:88px;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-hard:6px 6px 0 var(--ink-900);
  --radius:2px;
}

*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.8;
  font-weight:350;
  padding-left:var(--rail-w);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
ul,ol{list-style:none;padding:0}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{line-height:1.2;font-weight:400}
h1{font-size:clamp(40px,5vw,72px);font-weight:300;letter-spacing:.01em;line-height:1.1}
h2{font-size:clamp(28px,3vw,44px);font-weight:400;letter-spacing:.01em}
h3{font-size:clamp(20px,2vw,26px);font-weight:500;line-height:1.35}
p{max-width:46em}
::selection{background:var(--cyan);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
[hidden]{display:none !important}

.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:12px;
  left:calc(var(--rail-w) + 16px);
  z-index:200;
  padding:10px 20px;
  background:var(--amber);
  color:var(--ink-900);
  font-weight:500;
  font-size:14px;
  text-decoration:none;
  border:2px solid var(--ink-900);
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- header shell ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  padding:14px 24px 6px;
  background:linear-gradient(180deg,var(--ink-900) 0%,rgba(6,19,33,.94) 58%,rgba(6,19,33,0) 100%);
}
.site-header__bar{
  display:flex;
  justify-content:center;
  max-width:1440px;
  margin:0 auto;
}

.read-line{
  position:fixed;
  top:0;
  left:var(--rail-w);
  right:0;
  height:2px;
  background:var(--line);
  z-index:120;
  pointer-events:none;
}
.read-line__fill{
  display:block;
  width:0%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
}

/* ---------- brand rail ---------- */
.site-rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:16px;
  padding:26px 0 22px;
  background:var(--ink-800);
  border-right:2px solid var(--line);
}
.site-rail__brand{
  writing-mode:vertical-rl;
  font-size:15px;
  letter-spacing:.34em;
  color:var(--paper);
  text-decoration:none;
  font-weight:500;
  transition:color .16s ease;
}
.site-rail__brand:hover{color:var(--cyan)}
.site-rail__version{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--mist);
}
.site-rail__rule{
  flex:1;
  width:2px;
  min-height:32px;
  background:linear-gradient(180deg,var(--line) 0%,rgba(36,64,92,.05) 100%);
}
.site-rail__chapter{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
}
.site-rail__index{
  font-family:var(--font-mono);
  font-size:20px;
  line-height:1;
  letter-spacing:.04em;
  color:var(--cyan);
}
.site-rail__label{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.26em;
  color:var(--mist);
}

/* ---------- floating capsule nav ---------- */
.nav-pill{
  display:flex;
  align-items:center;
  gap:8px;
  width:100%;
  max-width:1120px;
  padding:8px 10px 8px 12px;
  background:rgba(11,31,51,.9);
  border:2px solid var(--line);
  border-radius:999px;
  box-shadow:5px 5px 0 var(--line);
}
.nav-pill__mark{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:36px;
  height:36px;
  border-radius:var(--radius);
  background:var(--amber);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  border:2px solid var(--ink-900);
  transition:transform .16s ease;
}
.nav-pill__mark:hover{transform:translate(-1px,-1px)}

.site-nav{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0 auto;
}
.site-nav__link{
  position:relative;
  display:block;
  padding:9px 15px;
  border-radius:999px;
  font-size:14.5px;
  line-height:1.4;
  color:var(--mist);
  text-decoration:none;
  white-space:nowrap;
  transition:color .16s ease,background .16s ease;
}
.site-nav__link:hover{color:var(--paper);background:rgba(53,224,255,.09)}
.site-nav__link:active{background:rgba(53,224,255,.16)}
.site-nav__link[aria-current="page"]{color:var(--cyan);font-weight:500}
.site-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:15px;
  right:15px;
  bottom:3px;
  height:2px;
  background:var(--cyan);
  border-radius:2px;
}

.nav-pill__tools{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.tool-link{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--mist);
  text-decoration:none;
  padding:6px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  transition:color .16s ease,border-color .16s ease;
}
.tool-link:hover{color:var(--cyan);border-color:var(--cyan)}
.tool-lamp{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:6px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--paper);
  text-decoration:none;
}
.tool-lamp:hover{color:var(--amber)}
.lamp{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 0 3px rgba(255,182,72,.16);
  animation:lampPulse 2.6s ease-in-out infinite;
}
@keyframes lampPulse{
  0%,100%{opacity:1}
  50%{opacity:.42}
}

.progress-ring{
  --read:0;
  position:relative;
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  border-radius:50%;
  background:conic-gradient(var(--cyan) calc(var(--read) * 1%),var(--line) 0);
  flex:0 0 auto;
}
.progress-ring::before{
  content:"";
  position:absolute;
  inset:4px;
  border-radius:50%;
  background:var(--ink-800);
}
.progress-ring__num{
  position:relative;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.02em;
  color:var(--mist);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 14px;
  border:2px solid var(--line);
  border-radius:999px;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  transition:border-color .16s ease,color .16s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  gap:4px;
  width:18px;
}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  border-radius:2px;
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- footer ---------- */
.site-footer{
  margin-top:clamp(56px,8vw,120px);
  padding:clamp(40px,6vw,80px) 32px 0;
  background:var(--ink-800);
  border-top:2px solid var(--line);
  color:var(--mist);
  font-size:15px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.5fr 1fr;
  gap:40px;
  max-width:1440px;
  margin:0 auto;
  padding-bottom:48px;
  border-bottom:1px solid var(--line);
}
.footer-brand__mark{
  display:inline-block;
  font-size:26px;
  font-weight:300;
  letter-spacing:.14em;
  color:var(--paper);
  text-decoration:none;
  border-bottom:2px solid var(--cyan);
  padding-bottom:6px;
}
.footer-brand__mark:hover{color:var(--cyan)}
.footer-brand__line{
  margin-top:18px;
  max-width:22em;
  line-height:1.8;
  color:var(--mist);
}
.footer-brand__version{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--line);
  color:#3A5A78;
}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-bottom:18px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-list a{
  color:var(--mist);
  text-decoration:none;
  transition:color .16s ease,padding-left .16s ease;
}
.footer-list a:hover{color:var(--paper);padding-left:4px}
.footer-list--plain li{
  color:var(--mist);
  line-height:1.7;
  overflow-wrap:anywhere;
}
.footer-note{
  margin-top:16px;
  font-size:12.5px;
  line-height:1.75;
  color:var(--mist);
  opacity:.78;
  max-width:26em;
}
.footer-icp{
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--mist);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  max-width:1440px;
  margin:0 auto;
  padding:20px 0 28px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--mist);
}
.footer-legal__copy{font-family:var(--font-mono);font-size:11.5px;max-width:none}
.footer-legal__links{display:flex;gap:22px}
.footer-legal__links a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.footer-legal__links a:hover{color:var(--cyan);border-color:var(--cyan)}

/* ---------- shared content primitives ---------- */
.container{
  width:100%;
  max-width:1440px;
  margin:0 auto;
  padding:0 32px;
}
.section{padding:clamp(44px,6vw,96px) 0}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:20px;
  padding-bottom:16px;
  margin-bottom:32px;
  border-bottom:2px solid var(--line);
}
.prose{max-width:44em;line-height:1.8}
.prose p+p{margin-top:1.1em}
.prose a{color:var(--cyan);text-decoration:none;border-bottom:1px solid rgba(53,224,255,.4)}
.prose a:hover{border-color:var(--cyan)}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.index-num{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--amber);
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 24px;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:var(--ink-700);
  color:var(--paper);
  font-size:15px;
  font-weight:500;
  text-decoration:none;
  transition:transform .16s ease,box-shadow .16s ease,background .16s ease,color .16s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:4px 4px 0 var(--line)}
.btn:active{transform:translate(0,0);box-shadow:none}
.btn--amber{
  background:var(--amber);
  color:var(--ink-900);
  border-color:var(--amber);
  box-shadow:5px 5px 0 rgba(53,224,255,.22);
}
.btn--amber:hover{box-shadow:7px 7px 0 rgba(53,224,255,.32)}
.btn--ghost{background:transparent}

.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.breadcrumbs li{display:inline-flex;align-items:center}
.breadcrumbs li+li::before{content:"/";margin:0 10px;color:var(--line)}
.breadcrumbs a{color:var(--mist);text-decoration:none}
.breadcrumbs a:hover{color:var(--cyan)}

.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:24px;
}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}

.panel{
  background:var(--ink-700);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
  padding:clamp(20px,3vw,28px);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--mfg{color:var(--tag-mfg)}
.tag--retail{color:var(--tag-retail)}
.tag--logi{color:var(--tag-logi)}
.tag--edu{color:var(--tag-edu)}
.tag--med{color:var(--tag-med)}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--ink-700);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
}
.media__frame{
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  object-fit:cover;
}
.media--wide .media__frame{aspect-ratio:21 / 9}
.media--square .media__frame{aspect-ratio:1 / 1}
.media__caption{
  display:block;
  padding:10px 14px;
  border-top:2px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--mist);
}

.stat{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding-left:16px;
  border-left:2px solid var(--line);
}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(30px,4vw,54px);
  line-height:1;
  letter-spacing:.01em;
  color:var(--paper);
}
.stat__label{
  font-size:13px;
  letter-spacing:.04em;
  color:var(--mist);
}

.has-js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .24s ease,transform .24s ease;
}
.has-js [data-reveal="in"]{
  opacity:1;
  transform:none;
}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1.4fr;gap:32px}
  .footer-meta{grid-column:span 3}
  .footer-meta .footer-list{flex-direction:row;flex-wrap:wrap;gap:8px 26px}
}
@media (max-width:1023px){
  body{padding-left:0;font-size:16px}
  .site-rail{display:none}
  .read-line{left:0}
  .skip-link{left:16px}
  .site-header{padding:10px 14px 4px}
  .nav-pill{
    flex-wrap:wrap;
    border-radius:20px;
    padding:8px 12px;
    gap:8px;
    box-shadow:4px 4px 0 var(--line);
  }
  .nav-pill__mark{order:1}
  .nav-pill__tools{order:2;margin-left:auto;gap:6px}
  .nav-toggle{order:3;display:inline-flex}
  .site-nav{
    order:4;
    display:none;
    flex-basis:100%;
    width:100%;
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    margin:6px 0 0;
    padding-top:8px;
    border-top:2px solid var(--line);
  }
  .site-nav[data-open]{display:flex}
  .site-nav__link{
    padding:12px 14px;
    border-radius:10px;
    font-size:15px;
  }
  .site-nav__link[aria-current="page"]{
    background:rgba(53,224,255,.1);
  }
  .site-nav__link[aria-current="page"]::after{
    left:auto;
    right:14px;
    top:50%;
    bottom:auto;
    width:6px;
    height:6px;
    margin-top:-3px;
    border-radius:50%;
  }
  .tool-link{display:none}
  .tool-lamp{padding:6px 8px}
  .container{padding:0 20px}
  .site-footer{padding-left:20px;padding-right:20px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand,.footer-meta{grid-column:span 2}
  .footer-meta .footer-list{flex-direction:column;gap:10px}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:12px}
}
@media (max-width:760px){
  .grid{grid-template-columns:1fr}
  .col-4,.col-6,.col-8{grid-column:span 1}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand,.footer-meta{grid-column:span 1}
  .progress-ring{width:38px;height:38px}
  .nav-pill__mark{width:32px;height:32px;font-size:13px}
  .section-head{flex-direction:column;align-items:flex-start}
}

@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;
  }
  .lamp{animation:none}
  .has-js [data-reveal]{opacity:1;transform:none}
}