:root{
  --bg-deep:#0B0F1A;
  --bg-card:#111827;
  --line:#1F2937;
  --neon:#00FF88;
  --blue:#00BFFF;
  --orange:#FF4500;
  --text-main:#E5E7EB;
  --text-sub:#9CA3AF;
  --header-h:72px;
  --container-w:1400px;
  --number-font:"Roboto Mono","SFMono-Regular",monospace;
  --head-font:"Arial Black","Helvetica Neue",sans-serif;
  --body-font:"Inter","Noto Sans SC",sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
  --radius:0;
  --space:clamp(1rem,3vw,2.8rem);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;background:var(--bg-deep)}
html:focus-within{scroll-behavior:smooth}
body{
  background:
    radial-gradient(ellipse 80% 50% at -10% 0%,rgba(0,255,136,.06),transparent 60%),
    radial-gradient(ellipse 60% 40% at 110% 20%,rgba(0,191,255,.05),transparent 60%),
    var(--bg-deep);
  color:var(--text-main);
  font-family:var(--body-font);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--neon)}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
ul,ol{list-style:none}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px}
::selection{background:var(--neon);color:#000}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{
  position:fixed;top:calc(var(--header-h) + 4px);left:12px;z-index:2000;
  background:var(--neon);color:#000;padding:8px 16px;font-weight:700;
  transform:translateY(-300%);transition:transform .2s var(--ease)
}
.skip-link:focus{transform:translateY(0);color:#000}
body{min-height:100vh}
#main-content{outline:none}
/* 布局容器 */
.page-container{width:min(var(--container-w),100% - 2rem);margin-inline:auto;padding-inline:0}
/* 通用网格 */
.dash-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(.75rem,2vw,1.5rem);width:min(var(--container-w),100% - 2rem);margin-inline:auto}
/* 按钮 */
.btn,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:.6rem;padding:.9rem 1.7rem;font-family:var(--head-font);font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;position:relative;overflow:hidden;transition:transform .2s var(--ease),border-color .2s,color .2s}
.btn{background:var(--neon);color:#000;border:1px solid var(--neon)}
.btn:hover{color:#000;transform:translateY(-2px);box-shadow:0 0 26px rgba(0,255,136,.25)}
.btn::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,transparent 30%,rgba(255,255,255,.55) 50%,transparent 70%);transform:translateX(-120%);transition:transform .5s var(--ease)}
.btn:hover::after{transform:translateX(120%)}
.btn-ghost{background:transparent;color:var(--blue);border:1px solid var(--blue)}
.btn-ghost:hover{color:var(--bg-deep);background:var(--blue);transform:translateY(-2px)}
/* 面包屑 */
.breadcrumb{display:flex;flex-wrap:wrap;gap:.5rem;padding:1.2rem 0;font-size:.8rem;letter-spacing:.04em}
.breadcrumb a::after{content:"/";margin-left:.5rem;color:var(--text-sub)}
.breadcrumb span[aria-current="page"]{color:var(--neon);font-weight:600}
/* 头部 */
.site-header{
  position:sticky;top:0;z-index:500;height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 max(1rem, calc((100vw - var(--container-w)) / 2));
  background:rgba(11,15,26,.82);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);box-shadow:0 8px 28px rgba(0,0,0,.4)
}
.brand-lockup{display:inline-flex;align-items:center;gap:.7rem;color:var(--text-main)}
.brand-mark,.footer-logo-mark{
  width:42px;height:42px;display:flex;align-items:center;justify-content:center;
  background:var(--neon);color:#000;font-family:var(--head-font);font-size:1.2rem;transform:skew(-8deg)
}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong,.footer-logo-text strong{font-family:var(--head-font);font-size:1rem;letter-spacing:.04em;color:var(--text-main)}
.brand-text small,.footer-logo-text small{font-family:var(--number-font);font-size:.65rem;color:var(--neon);letter-spacing:.16em}
.header-actions{display:flex;align-items:center;gap:.5rem}
.header-search{
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;color:var(--blue);border:1px solid transparent;transition:border-color .2s,color .2s
}
.header-search:hover{color:var(--neon);border-color:var(--line)}
.search-glyph{width:18px;height:18px;border:2px solid currentColor;border-radius:50%;position:relative}
.search-glyph::after{content:"";position:absolute;width:8px;height:2px;background:currentColor;transform:rotate(45deg);right:-7px;bottom:-3px}
.nav-toggle{display:flex;width:46px;height:46px;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid var(--line);background:var(--bg-card);transition:border-color .2s}
.nav-toggle:hover{border-color:var(--neon)}
.nav-toggle-line{display:block;width:22px;height:2px;background:var(--neon);transition:transform .3s var(--ease),opacity .2s}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* 抽屉导航 */
.nav-overlay{position:fixed;inset:0;z-index:550;background:rgba(0,0,0,.5);opacity:0;transition:opacity .3s var(--ease)}
.nav-overlay[data-open="true"]{opacity:1}
.nav-drawer{
  position:fixed;top:0;right:0;width:min(420px,88vw);height:100%;z-index:600;
  background:var(--bg-card);border-left:1px solid var(--line);
  transform:translateX(102%);transition:transform .35s var(--ease);
  display:flex;flex-direction:column;padding:1.4rem 1.8rem 2rem;
  box-shadow:-20px 0 60px rgba(0,0,0,.5);
  visibility:hidden
}
.nav-drawer[data-open="true"]{transform:translateX(0);visibility:visible}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:1.4rem;border-bottom:1px solid var(--line);margin-bottom:2rem}
.drawer-index{font-family:var(--number-font);font-size:.8rem;color:var(--text-sub);letter-spacing:.2em}
.drawer-close{width:44px;height:44px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);color:var(--text-sub);transition:color .2s,border-color .2s}
.drawer-close:hover{color:var(--neon);border-color:var(--neon)}
.close-glyph{position:relative;width:20px;height:20px}
.close-glyph::before,.close-glyph::after{content:"";position:absolute;left:0;top:9px;width:20px;height:2px;background:currentColor}
.close-glyph::before{transform:rotate(45deg)}
.close-glyph::after{transform:rotate(-45deg)}
.drawer-nav-list{display:flex;flex-direction:column;gap:.25rem;flex:1;overflow-y:auto}
.drawer-nav-list a{
  display:flex;align-items:center;justify-content:space-between;padding:1rem .5rem;
  font-family:var(--head-font);font-size:clamp(1.3rem,3vw,1.7rem);color:var(--text-main);
  border-bottom:1px solid rgba(31,41,55,.6);transition:color .2s,padding-left .2s,background .2s
}
.drawer-nav-list a::after{content:"→";font-family:var(--number-font);color:var(--text-sub);transition:transform .2s,color .2s}
.drawer-nav-list a:hover{color:var(--neon);padding-left:1rem}
.drawer-nav-list a:hover::after{color:var(--neon);transform:translateX(4px)}
.drawer-nav-list a[aria-current="page"]{color:var(--neon);background:rgba(0,255,136,.04);border-left:3px solid var(--neon);padding-left:1rem}
.drawer-nav-list a[aria-current="page"]::after{content:"●";color:var(--neon);font-size:.7rem}
.drawer-meta{margin-top:2rem;padding-top:1.4rem;border-top:1px solid var(--line)}
.drawer-trust{font-size:.8rem;color:var(--text-sub);line-height:1.6;letter-spacing:.02em}
.drawer-contact{margin-top:.8rem;font-family:var(--number-font);font-size:.75rem;color:var(--blue);word-break:break-all}
/* 页脚 */
.site-footer{background:linear-gradient(165deg,#0D1220 0%,var(--bg-deep) 100%);border-top:1px solid var(--line);padding:4rem 0 2rem;margin-top:clamp(4rem,8vw,7rem)}
.site-footer > *{max-width:var(--container-w);margin-inline:auto;padding-inline:1.5rem}
.footer-brand-col{display:flex;flex-direction:column;gap:1.2rem;max-width:400px;margin-bottom:3rem}
.footer-logo{display:inline-flex;align-items:center;gap:.7rem}
.footer-logo-mark{width:46px;height:46px;font-size:1.15rem}
.footer-logo-text{display:flex;flex-direction:column}
.footer-logo-text strong{font-size:1.08rem}
.footer-trust{font-size:.8rem;color:var(--text-sub);line-height:1.7}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2rem;max-width:900px;padding-bottom:3rem;border-bottom:1px solid var(--line)}
.footer-column h2{font-family:var(--head-font);font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;color:var(--neon);margin-bottom:1.2rem}
.footer-links li{padding:.35rem 0}
.footer-links a{color:var(--text-sub);font-size:.9rem;display:inline-block;padding:.15rem 0;transition:color .2s,transform .2s}
.footer-links a:hover{color:var(--neon);transform:translateX(3px)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;margin-top:2.2rem;padding-top:2rem;border-top:1px solid var(--line)}
.footer-contact{display:flex;flex-wrap:wrap;gap:.8rem 2rem;font-size:.78rem;color:var(--text-sub)}
.footer-contact .footer-address{flex-basis:100%;color:var(--text-sub);opacity:.7}
.footer-legal{display:flex;flex-wrap:wrap;gap:1rem;font-family:var(--number-font);font-size:.75rem;color:var(--text-sub)}
.footer-icp{color:var(--text-sub)}
.footer-copy{color:var(--text-sub)}
/* 通用章节与斜切数据带 */
.data-rail{position:relative;padding:2.4rem var(--space);background:var(--bg-card);border-left:3px solid var(--neon)}
.data-rail::before{content:"";position:absolute;top:0;left:15%;width:28px;height:100%;background:var(--blue);opacity:.15;transform:skewX(-15deg);pointer-events:none}
.section-slant{position:relative;overflow:hidden}
.section-slant::after{content:"";position:absolute;right:-10%;top:-30%;width:36%;height:160%;background:var(--blue);opacity:.04;transform:rotate(12deg) skewX(-10deg);pointer-events:none}
.section-slant-alt::after{left:-10%;right:auto;background:var(--neon);opacity:.05}
/* 网格卡片 */
.grid-card{background:var(--bg-card);border:1px solid var(--line);padding:1.8rem;position:relative;transition:transform .3s var(--ease),border-color .3s,box-shadow .3s}
.grid-card:hover{transform:translateY(-4px);border-color:rgba(0,255,136,.35);box-shadow:0 14px 40px rgba(0,0,0,.4)}
.card-index{font-family:var(--number-font);font-size:.7rem;color:var(--blue);letter-spacing:.18em;display:block;margin-bottom:1.6rem}
.card-title{font-family:var(--head-font);color:var(--text-main);font-size:1.15rem;letter-spacing:.02em;line-height:1.3;margin-bottom:.8rem}
.card-meta{font-size:.82rem;color:var(--text-sub);line-height:1.6}
.card-link{margin-top:1.2rem;display:inline-flex;gap:.4rem;color:var(--neon);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase}
.card-link::after{content:"→"}
/* 数字等宽 */
.tabular, .hero-numbers, .scroll-progress span{font-family:var(--number-font);font-variant-numeric:tabular-nums}
/* 图片容器基础规则 */
.img-frame,.img-frame-tall{position:relative;overflow:hidden;background:radial-gradient(circle at 20% 20%,rgba(0,255,136,.08),transparent 60%),var(--bg-card);border:1px solid var(--line)}
.img-frame::before,.img-frame-tall::before{content:"IMG_DATUM";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--number-font);font-size:.7rem;letter-spacing:.3em;color:var(--text-sub);background:linear-gradient(115deg,transparent 45%,rgba(0,255,136,.03) 50%,transparent 55%);background-size:250% 250%;animation:scan 8s linear infinite;opacity:.7}
.img-frame{aspect-ratio:16/9}
.img-frame-tall{aspect-ratio:3/4}
@keyframes scan{0%{background-position:200% 0}100%{background-position:-100% 0}}
/* 滚动进度条 */
.scroll-progress{position:fixed;left:0;top:var(--header-h);height:3px;width:100%;z-index:900;pointer-events:none}
.scroll-progress-inner{height:100%;width:0;background:linear-gradient(90deg,var(--neon),var(--blue));box-shadow:0 0 12px rgba(0,255,136,.5)}
/* 返回顶部 */
.back-top{position:fixed;right:1.5rem;bottom:1.8rem;z-index:700;width:46px;height:46px;display:flex;align-items:center;justify-content:center;background:var(--bg-card);border:1px solid var(--neon);color:var(--neon);opacity:0;pointer-events:none;transform:translateY(12px);transition:opacity .25s var(--ease),transform .25s var(--ease),background .2s,color .2s}
.back-top[data-shown="true"]{opacity:1;pointer-events:auto;transform:translateY(0)}
.back-top:hover{background:var(--neon);color:#000}
.back-top::before{content:"↑";font-family:var(--head-font);font-size:1.2rem}
/* 章节监视容器 */
[data-scroll-spy]{scroll-margin-top:calc(var(--header-h) + 20px)}
.spy-indicator{display:flex;gap:.45rem;align-items:center;font-family:var(--number-font);font-size:.72rem;color:var(--text-sub);letter-spacing:.2em}
/* 通用正文列表 */
.prose{max-width:70ch}
.prose p{margin-bottom:1rem;color:var(--text-main)}
.prose p strong{color:var(--neon);font-weight:500}
.prose h2,.prose h3{font-family:var(--head-font);line-height:1.3;margin:2rem 0 1rem}
.prose h2{font-size:clamp(1.4rem,2vw,2rem)}
.prose ul{list-style:none;margin-left:0}
.prose ul li{padding-left:1.3rem;position:relative;margin:.5rem 0;color:var(--text-sub)}
.prose ul li::before{content:"›";position:absolute;left:0;color:var(--neon);font-family:var(--number-font)}
/* 响应式与其它 */
@media (max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  :root{--header-h:60px}
  .site-header{padding:0 .8rem}
  .brand-mark,.footer-logo-mark{width:34px;height:34px;font-size:.95rem}
  .brand-text strong{font-size:.88rem}
  .brand-text small{font-size:.58rem}
  .nav-drawer{width:min(100vw,360px);padding-inline:1.1rem}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
  .footer-contact{flex-direction:column}
  .header-search{width:38px;height:38px}
  .nav-toggle{width:40px;height:40px;gap:4px}
  .nav-toggle-line{width:18px;height:2px}
  .nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
  .grid-card{padding:1.3rem}
  .back-top{right:.9rem;bottom:1rem;width:40px;height:40px}
}
@media (max-width:420px){
  .dash-grid{grid-template-columns:repeat(4,1fr)}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}