/* ============ 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,p,ul,ol,li,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,picture{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}

/* ============ 2. Tokens ============ */
:root{
  --ink:#06090C;
  --panel:#12181F;
  --steel:#1E2A33;
  --cyan:#16E0E0;
  --lime:#C6FF3D;
  --white:#F2F6F8;
  --mist:#8FA3AE;
  --deep:#0B2B2E;
  --flare:#FF5A36;
  --paper:#E8E4DA;
  --dim:#5C6E7A;
  --body-text:#DCE5EA;
  --header-h:64px;
  --shell:1280px;
  --gap:clamp(14px,2vw,28px);
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Roboto Mono",monospace;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --display:"Noto Sans SC","Source Han Sans SC","PingFang SC",system-ui,-apple-system,"Microsoft YaHei",sans-serif;
}
@media (min-width:921px){:root{--header-h:84px}}

/* ============ 3. 中文排版底座 ============ */
body{
  background:var(--ink);
  color:var(--white);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:1100px){body{font-size:17px}}
.mono,.nav__num,.brand__tag,.tag,.btn,.footer__field,.footer__value--mono,.footer__band,.breadcrumbs ol,.chip,.index-card__meta,.index-card__num,.index-card__foot,.field-row,.stat__value,.section-head__num,.figure__cap,.footer__title{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
}
:where(a,button,[tabindex],summary):focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}
::selection{background:var(--cyan);color:var(--ink)}
.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}
.is-hidden{display:none !important}

/* ============ 4. 布局基座 ============ */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(18px,4vw,44px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.band{background:var(--deep);border-top:1px solid var(--steel);border-bottom:1px solid var(--steel);padding-block:clamp(26px,4vw,54px)}
.rule{height:1px;background:var(--steel);border:0}
.slant-rule{height:8px;background:var(--cyan);clip-path:polygon(0 0,100% 0,100% 38%,0 100%)}

/* ============ 5. 头部 ============ */
.site-header{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,var(--ink) 0%,#0A0F14 100%);
  border-bottom:1px solid var(--steel);
  --progress:0;
}
.site-header[data-scrolled]{--header-h:56px}
.header-progress{
  position:absolute;left:0;bottom:0;height:2px;width:100%;
  transform:scaleX(var(--progress,0));transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--lime));
  will-change:transform;pointer-events:none;
}
.masthead{
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  min-height:var(--header-h);
  transition:min-height .2s ease;
}
.masthead__brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand{display:inline-flex;align-items:baseline;gap:6px;transition:opacity .15s ease}
.brand:hover{opacity:.85}
.brand__mark{
  font-family:var(--display);font-weight:900;
  font-size:clamp(20px,2.3vw,26px);line-height:1;
  letter-spacing:-.02em;color:var(--white);
  transition:font-size .2s ease;
}
.brand__cn{
  font-family:var(--display);font-weight:900;
  font-size:clamp(13px,1.4vw,16px);
  letter-spacing:.14em;color:var(--cyan);
}
.site-header[data-scrolled] .brand__mark{font-size:20px}
.brand__tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;background:var(--paper);color:var(--ink);
  font-size:11px;letter-spacing:.08em;white-space:nowrap;
  clip-path:polygon(6px 0,100% 0,calc(100% - 6px) 100%,0 100%);
}
.brand__tag b{font-weight:700;letter-spacing:.04em}
.site-header[data-scrolled] .brand__tag{background:var(--cyan)}
.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:10px 14px;border:1px solid var(--steel);color:var(--mist);
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;
  transition:border-color .15s ease,color .15s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--white)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars i{display:block;height:2px;background:currentColor}
.nav-toggle__label{display:inline-block}
.nav{
  display:flex;align-items:center;gap:clamp(4px,1.2vw,18px);
  margin-left:auto;
}
.nav__list{display:flex;align-items:center;gap:2px}
.nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:7px;
  padding:10px 11px;font-size:14px;color:var(--mist);
  transition:color .15s ease,background-color .15s ease;
}
.nav__link:hover{color:var(--white);background:var(--panel)}
.nav__num{font-size:10px;letter-spacing:.06em;color:var(--dim);transition:color .15s ease}
.nav__link:hover .nav__num{color:var(--mist)}
.nav__link[aria-current="page"]{color:var(--white)}
.nav__link[aria-current="page"] .nav__num{color:var(--cyan)}
.nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:9px;right:9px;bottom:4px;height:2px;background:var(--cyan);
}
.nav__utility{display:flex;align-items:center}
.nav-switch{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border:1px solid var(--cyan);color:var(--cyan);
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;white-space:nowrap;
  transition:background-color .15s ease,color .15s ease;
}
.nav-switch::after{content:"→";font-family:var(--sans);line-height:1}
.nav-switch:hover{background:var(--cyan);color:var(--ink)}
.header-rule{height:2px;background:var(--steel)}
.header-rule::after{content:"";display:block;height:2px;width:22%;min-width:120px;background:var(--cyan)}

/* ============ 6. 页脚 ============ */
.site-footer{background:var(--deep);border-top:1px solid var(--steel);margin-top:clamp(48px,7vw,96px)}
.footer__top{
  display:grid;
  grid-template-columns:minmax(210px,1.5fr) repeat(3,minmax(130px,1fr)) minmax(200px,1.3fr);
  gap:clamp(22px,3vw,44px);
  padding-block:clamp(34px,5vw,64px);
}
.footer__col--brand{display:flex;flex-direction:column;gap:10px}
.footer__brand{
  font-family:var(--display);font-weight:900;font-size:22px;
  letter-spacing:-.01em;color:var(--white);line-height:1.2;
}
.footer__blurb{font-size:14px;color:var(--mist);max-width:30ch;line-height:1.7}
.footer__stamp{
  margin-top:4px;padding-left:12px;border-left:2px solid var(--cyan);
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--mist);
}
.footer__title{
  font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:16px;font-weight:500;
}
.footer__list li+li{margin-top:9px}
.footer__link{font-size:14px;color:var(--mist);transition:color .15s ease}
.footer__link::after{content:"→";display:inline-block;margin-left:0;color:var(--lime);opacity:0;transform:translateX(-4px);transition:opacity .15s ease,transform .15s ease,margin-left .15s ease}
.footer__link:hover{color:var(--white)}
.footer__link:hover::after{opacity:1;transform:translateX(0);margin-left:8px}
.footer__col--contact{display:flex;flex-direction:column}
.footer__contact-line{display:flex;flex-direction:column;gap:3px;padding:9px 0;border-top:1px solid rgba(30,42,51,.85)}
.footer__contact-line:first-of-type{border-top:0;padding-top:0}
.footer__field{font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.footer__value{font-size:14px;color:var(--white);line-height:1.6;word-break:break-word}
.footer__value--mono{letter-spacing:.02em;color:var(--lime)}
.footer__band{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;border-top:1px solid var(--steel);
  padding-block:16px;font-size:12px;letter-spacing:.04em;color:var(--mist);
}
.footer__icp{color:var(--white)}
.footer__copy{color:var(--mist)}
.footer__note{color:var(--dim)}

/* ============ 7. 通用组件 ============ */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid currentColor;color:var(--cyan);
  font-size:11px;line-height:1.5;letter-spacing:.1em;text-transform:uppercase;white-space:nowrap;
}
.tag--paper{background:var(--paper);border-color:var(--paper);color:var(--ink)}
.tag--live{color:var(--flare)}
.tag--live::before{content:"";width:6px;height:6px;background:var(--flare);border-radius:50%}
.tag--lime{color:var(--lime)}
.tag--ghost{border-color:var(--steel);color:var(--mist)}
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border:1px solid var(--cyan);color:var(--cyan);
  font-family:var(--mono);font-size:13px;letter-spacing:.08em;
  transition:background-color .15s ease,color .15s ease,border-color .15s ease;
}
.btn::after{content:"→";font-family:var(--sans);transition:transform .15s ease}
.btn:hover{background:var(--cyan);color:var(--ink)}
.btn:hover::after{transform:translateX(3px)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.btn--primary:hover{background:var(--lime);border-color:var(--lime);color:var(--ink)}
.btn--ghost{border-color:var(--steel);color:var(--white)}
.btn--ghost:hover{border-color:var(--white);background:var(--panel);color:var(--white)}
.breadcrumbs{padding-block:16px}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.04em;color:var(--mist)}
.breadcrumbs li+li::before{content:"/";margin-right:8px;color:var(--dim)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--white)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;
  padding-bottom:16px;border-bottom:1px solid var(--steel);
  margin-bottom:clamp(20px,3vw,34px);
}
.section-head__num{font-size:12px;letter-spacing:.18em;color:var(--cyan)}
.section-head__title{
  font-family:var(--display);font-weight:900;
  font-size:clamp(24px,3.4vw,38px);line-height:1.15;letter-spacing:-.02em;color:var(--white);
}
.section-head__note{margin-left:auto;font-size:13px;color:var(--mist)}
.index-card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:clamp(18px,2.4vw,26px);
  background:var(--panel);border:1px solid var(--steel);
  transition:transform .16s ease,border-color .16s ease,background-color .16s ease;
}
.index-card:hover{transform:translateY(-2px);border-color:var(--cyan)}
.index-card:focus-within{border-color:var(--cyan)}
.index-card__num{
  position:absolute;top:-1px;right:-1px;padding:4px 10px;
  background:var(--paper);color:var(--ink);font-size:11px;letter-spacing:.08em;
}
.index-card__meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px;color:var(--mist)}
.index-card__title{
  font-family:var(--display);font-weight:800;
  font-size:clamp(18px,2vw,22px);line-height:1.35;letter-spacing:-.01em;color:var(--white);
}
.index-card__title a:hover{color:var(--cyan)}
.index-card__text{font-size:14.5px;line-height:1.7;color:var(--mist)}
.index-card__foot{
  margin-top:auto;padding-top:12px;border-top:1px solid var(--steel);
  font-size:12px;letter-spacing:.04em;color:var(--dim);
}
.field-row{
  display:flex;align-items:baseline;gap:12px;
  padding:10px 0;border-bottom:1px solid var(--steel);
  font-size:13px;color:var(--mist);
}
.field-row__key{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.field-row__value{margin-left:auto;color:var(--white)}
.field-row__value--num{color:var(--lime)}
.field-row:hover .field-row__value::after{content:"→";margin-left:10px;color:var(--lime)}
.stat{display:flex;flex-direction:column;gap:6px}
.stat__value{font-size:clamp(28px,4vw,44px);line-height:1;letter-spacing:-.02em;color:var(--lime)}
.stat__unit{font-size:.48em;color:var(--mist);margin-left:4px;letter-spacing:.06em}
.stat__label{font-size:13px;color:var(--mist)}
.figure{position:relative;margin:0;background:var(--panel);border:1px solid var(--steel);overflow:hidden}
.figure__img{
  display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;
  background:linear-gradient(135deg,#12181F 0%,#0B2B2E 60%,#12202A 100%);
}
.figure__cap{
  padding:10px 14px;border-top:1px solid var(--steel);
  font-size:11.5px;letter-spacing:.04em;color:var(--mist);
}
.figure--wide .figure__img{aspect-ratio:21/9}
.figure--square .figure__img{aspect-ratio:1/1}
.figure--tall .figure__img{aspect-ratio:3/4}
.figure--slant{clip-path:polygon(0 3%,100% 0,100% 97%,0 100%)}
.figure--slate::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,9,12,0) 42%,rgba(6,9,12,.88) 100%);
}
.chip-bar{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:7px 14px;border:1px solid var(--steel);color:var(--mist);
  font-size:12px;letter-spacing:.06em;
  transition:background-color .15s ease,color .15s ease,border-color .15s ease;
}
.chip:hover{border-color:var(--cyan);color:var(--white)}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
[data-density-scope][data-density="compact"] .index-card{padding:14px 16px;gap:8px}
[data-density-scope][data-density="compact"] .field-row{padding:6px 0}

/* ============ 8. 长文 ============ */
.prose{max-width:66ch;font-size:16.5px;line-height:1.8;color:var(--body-text)}
.prose>*+*{margin-top:1.1em}
.prose h2{
  font-family:var(--display);font-weight:900;letter-spacing:-.01em;
  font-size:clamp(23px,3vw,32px);line-height:1.3;color:var(--white);margin-top:1.9em;
}
.prose h3{font-size:20px;font-weight:700;line-height:1.45;color:var(--white);margin-top:1.6em}
.prose a{color:var(--cyan);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose a:hover{color:var(--lime)}
.prose ul,.prose ol{padding-left:0}
.prose li{position:relative;padding-left:22px}
.prose li+li{margin-top:.5em}
.prose li::before{content:"—";position:absolute;left:0;color:var(--cyan)}
.prose ol{counter-reset:prose}
.prose ol li{counter-increment:prose}
.prose ol li::before{content:counter(prose,decimal-leading-zero);font-family:var(--mono);font-size:12px;top:.28em;color:var(--cyan)}
.prose strong{color:var(--white);font-weight:700}
.prose blockquote{border-left:3px solid var(--cyan);padding-left:18px;color:var(--mist)}
.prose code{font-family:var(--mono);font-size:.92em;color:var(--lime);background:rgba(30,42,51,.7);padding:2px 6px}

/* ============ 9. 跳转链接 / 状态 ============ */
.skip-link{
  position:absolute;left:12px;top:-120px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink);
  font-family:var(--mono);font-size:13px;letter-spacing:.06em;
  transition:top .15s ease;
}
.skip-link:focus{top:10px}
body.nav-open{overflow:hidden}

/* ============ 10. 断点 ============ */
@media (max-width:1180px){
  .footer__top{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px 28px}
  .footer__col--brand{grid-column:1 / -1}
}
@media (max-width:1080px){
  .nav__num{display:none}
  .nav__link{padding:10px 8px;font-size:13px}
}
@media (max-width:920px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;z-index:85;
    margin:0;flex-direction:column;align-items:stretch;gap:0;
    padding:10px clamp(18px,4vw,44px) 40px;
    background:var(--ink);border-top:1px solid var(--steel);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s;
  }
  .nav[data-open]{opacity:1;visibility:visible;transform:none}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid var(--steel)}
  .nav__link{display:flex;padding:18px 2px;font-size:20px;font-weight:800;letter-spacing:.02em;color:var(--white)}
  .nav__link:hover{background:transparent;color:var(--cyan)}
  .nav__num{display:inline-block;font-size:12px;color:var(--cyan)}
  .nav__link[aria-current="page"]::after{left:0;right:auto;width:34px;bottom:12px}
  .nav__utility{margin-top:22px;padding-top:22px;border-top:1px solid var(--steel)}
  .nav-switch{width:100%;justify-content:space-between;padding:14px 16px;font-size:13px}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:720px){
  .footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .brand__tag{display:none}
  .footer__band{flex-direction:column;align-items:flex-start}
  .section-head__note{margin-left:0;width:100%}
}
@media (max-width:560px){
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__top{grid-template-columns:minmax(0,1fr)}
  .prose{font-size:16px}
  .breadcrumbs{padding-block:12px}
}

/* ============ 11. 动效偏好 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .index-card:hover{transform:none}
}