:root{
  --ink:#07090F;
  --panel:#0E1622;
  --violet:#24153F;
  --yellow:#F2FF3A;
  --cyan:#31E6FF;
  --orange:#FF7A18;
  --white:#F4F7FF;
  --muted:#A6B2C8;
  --line:#2B3648;
  --hover:#12303A;
  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --maxw:1280px;
  --gutter:clamp(16px,4vw,40px);
  --cut:16px;
  --header-offset:126px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.012em;
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(43,54,72,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(43,54,72,.16) 1px,transparent 1px),
    radial-gradient(1100px 560px at 8% -8%,rgba(36,21,63,.92),transparent 62%),
    radial-gradient(920px 520px at 96% 0%,rgba(18,48,58,.62),transparent 58%);
  background-size:72px 72px,72px 72px,100% 100%,100% 100%;
  background-attachment:fixed,fixed,fixed,fixed;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol,dl{margin:0}
p{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin:0}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--yellow);color:#07090F}

/* 容器 */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.content{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.content--narrow{max-width:820px}

/* 排版工具 */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}
.eyebrow{display:inline-flex;align-items:center;gap:10px;margin:0 0 12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--yellow);transform:skewX(-24deg)}

/* 跳转链接 */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  padding:10px 18px;border-radius:3px;
  background:var(--yellow);color:#07090F;
  font-weight:800;font-size:13px;letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* 头部 */
.site-header{
  position:sticky;top:0;z-index:120;
  background:linear-gradient(180deg,rgba(7,9,15,.99),rgba(7,9,15,.9));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  transition:box-shadow .25s ease;
}
.site-header[data-stuck="true"]{box-shadow:0 18px 40px -28px rgba(0,0,0,.95)}
.brand-bar{
  border-bottom:1px solid rgba(43,54,72,.75);
  background:linear-gradient(90deg,rgba(36,21,63,.6),rgba(7,9,15,0) 58%);
}
.brand-bar__inner{display:flex;align-items:center;gap:clamp(12px,2vw,26px);flex-wrap:wrap;min-height:64px;padding-block:10px}
.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto}
.brand__mark{
  display:inline-grid;place-items:center;flex:0 0 auto;
  width:54px;height:40px;
  background:var(--yellow);color:#07090F;
  font-family:var(--font-mono);font-weight:700;font-size:14px;letter-spacing:.1em;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
}
.brand__text{display:flex;flex-direction:column;gap:2px}
.brand__name{font-weight:800;font-size:15px;line-height:1.25;letter-spacing:.03em}
.brand__sub{font-family:var(--font-mono);font-size:10px;line-height:1.3;letter-spacing:.24em;color:var(--cyan)}
.brand-bar__support{
  margin:0;padding-left:14px;border-left:1px solid var(--line);
  color:var(--muted);font-size:12.5px;letter-spacing:.04em;
}
.brand-bar__hours{display:inline-flex;align-items:center;gap:8px;margin:0;color:var(--muted);font-size:12px;letter-spacing:.06em}
.dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 0 rgba(49,230,255,.55);animation:ray-pulse 2.4s ease-in-out infinite}
@keyframes ray-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(49,230,255,.5)}
  50%{box-shadow:0 0 0 6px rgba(49,230,255,0)}
}
.brand-bar__cta{margin-left:auto}

/* 导航带 */
.nav-band{background:linear-gradient(90deg,rgba(14,22,34,.95),rgba(7,9,15,.6))}
.nav-band__inner{display:flex;align-items:center;gap:14px;flex-wrap:wrap;min-height:54px;padding-block:6px}
.site-nav__list{display:flex;align-items:center;flex-wrap:wrap;gap:2px;margin:0;padding:0;list-style:none}
.site-nav__list a{
  position:relative;display:block;padding:10px 14px;
  font-weight:800;font-size:14px;letter-spacing:.05em;color:var(--white);
  transition:color .18s ease,background .18s ease;
}
.site-nav__list a::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .22s cubic-bezier(.22,.68,.32,1);
}
.site-nav__list a:hover,.site-nav__list a:focus-visible{color:var(--yellow);background:rgba(18,48,58,.55)}
.site-nav__list a:hover::after,.site-nav__list a:focus-visible::after{transform:scaleX(1)}
.site-nav__list a[aria-current="page"]{color:var(--yellow)}
.site-nav__list a[aria-current="page"]::after{transform:scaleX(1);background:var(--yellow)}
.nav-band__meta{margin:0 0 0 auto;display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:11px;letter-spacing:.16em;font-family:var(--font-mono);text-transform:uppercase}
.nav-band__meta .mono{color:var(--yellow)}
.nav-band__meta-sep{color:var(--line)}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 14px;
  border:1px solid var(--line);background:rgba(14,22,34,.9);color:var(--white);
  font-weight:800;font-size:12.5px;letter-spacing:.14em;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:box-shadow .18s ease,color .18s ease;
}
.nav-toggle:hover{color:var(--yellow);box-shadow:inset 0 0 0 1px var(--cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;
  font-weight:800;font-size:13.5px;letter-spacing:.06em;line-height:1.2;
  border:1px solid var(--line);color:var(--white);
  background:rgba(18,48,58,.42);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .18s ease,color .18s ease,box-shadow .18s ease;
}
.btn:hover{background:var(--hover);box-shadow:inset 0 0 0 2px var(--cyan);color:var(--white)}
.btn--primary{background:var(--yellow);border-color:var(--yellow);color:#07090F}
.btn--primary:hover{background:#FFFFFF;box-shadow:inset 0 0 0 2px var(--cyan);color:#07090F}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--muted)}
.btn--ghost:hover{color:var(--yellow);border-color:var(--cyan)}

/* 标签 */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;line-height:1.6;
  border:1px solid var(--line);background:rgba(14,22,34,.92);color:var(--muted);
}
.tag--cyan{background:var(--cyan);border-color:var(--cyan);color:#07090F}
.tag--yellow{background:var(--yellow);border-color:var(--yellow);color:#07090F}
.tag--orange{background:var(--orange);border-color:var(--orange);color:#07090F}

/* 面包屑 */
.breadcrumbs{padding-block:18px 0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--muted)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px;list-style:none;margin:0;padding:0}
.breadcrumbs li+li::before{content:"/";margin-right:6px;color:var(--line)}
.breadcrumbs a{color:var(--cyan)}
.breadcrumbs a:hover{color:var(--yellow)}

/* 章节 */
.section{padding-block:clamp(40px,6vw,84px)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:clamp(20px,3vw,36px)}
.section__title{font-size:clamp(1.6rem,3vw,2.6rem);line-height:1.1}
.section__lede{max-width:58ch;color:var(--muted);font-size:15.5px;line-height:1.8}

/* Bento */
.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,1.6vw,20px)}
.bento__cell{grid-column:span 12;min-width:0}
@media (min-width:760px){
  .bento__cell--3{grid-column:span 3}
  .bento__cell--4{grid-column:span 4}
  .bento__cell--5{grid-column:span 5}
  .bento__cell--6{grid-column:span 6}
  .bento__cell--7{grid-column:span 7}
  .bento__cell--8{grid-column:span 8}
  .bento__cell--9{grid-column:span 9}
  .bento__cell--12{grid-column:span 12}
}

/* 面板 */
.panel{
  position:relative;height:100%;
  padding:clamp(16px,2vw,26px);
  background:linear-gradient(165deg,rgba(20,32,48,.94),rgba(11,17,26,.97));
  border:1px solid var(--line);
}
.panel--cut{
  border:0;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.panel--accent::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--yellow),var(--cyan) 42%,transparent 82%);
}
.panel__label{margin:0 0 10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.panel__title{font-size:clamp(1.05rem,1.6vw,1.35rem);line-height:1.28;margin:0 0 8px}

/* 图片容器 */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background-color:var(--panel);
  background-image:
    repeating-linear-gradient(0deg,rgba(49,230,255,.07) 0 1px,transparent 1px 4px),
    linear-gradient(150deg,#0E1622,#24153F 58%,#07090F);
}
.media__img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media__timecode{
  position:absolute;left:10px;bottom:10px;z-index:2;
  padding:2px 8px;
  background:rgba(7,9,15,.86);color:var(--yellow);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;font-variant-numeric:tabular-nums;
}
.media__cap{position:absolute;right:10px;top:10px;z-index:2}

/* 章节索引 */
.chapter-rail{display:none}
.chapter-rail__link{
  display:flex;gap:10px;align-items:baseline;
  padding:9px 12px;
  border-left:2px solid var(--line);
  color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.04em;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.chapter-rail__link:hover{color:var(--white);border-left-color:var(--cyan)}
.chapter-rail__link[aria-current="true"]{
  color:var(--yellow);border-left-color:var(--yellow);
  background:linear-gradient(90deg,rgba(242,255,58,.12),transparent 78%);
}
@media (min-width:1180px){
  .chapter-rail{display:block;position:sticky;top:calc(var(--header-offset) + 24px)}
  .chapter-rail ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
}

/* 页脚 */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,120px);
  padding-top:clamp(36px,5vw,72px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(7,9,15,.4),#0B1119 52%,#07090F);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--yellow),var(--cyan) 30%,transparent 70%);
  opacity:.7;
}
.footer__grid{display:grid;grid-template-columns:1fr;gap:clamp(24px,3vw,44px);padding-bottom:clamp(28px,4vw,48px)}
.footer__brand{display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.footer__name{font-weight:800;font-size:16px;letter-spacing:.04em}
.footer__statement{max-width:36ch;font-size:15px;line-height:1.75;color:var(--white)}
.footer__note{margin:0;color:var(--muted);font-size:12.5px;line-height:1.75;max-width:42ch}
.footer__title{margin:0 0 12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan)}
.footer__list{list-style:none;margin:0;padding:0;display:grid;gap:1px}
.footer__link{
  display:flex;align-items:baseline;gap:10px;
  padding:8px 0;
  border-bottom:1px dashed rgba(43,54,72,.7);
  font-weight:800;font-size:14px;letter-spacing:.03em;color:var(--white);
  transition:color .18s ease,padding-left .18s ease;
}
.footer__link:hover{color:var(--yellow);padding-left:4px}
.footer__num{font-size:11px;color:var(--cyan);letter-spacing:.14em}
.footer__link:hover .footer__num{color:var(--yellow)}
.footer__rows{display:grid;gap:10px;margin:0}
.footer__row{display:grid;grid-template-columns:56px 1fr;gap:10px;align-items:baseline}
.footer__row dt{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase}
.footer__row dd{margin:0;font-size:14px;line-height:1.6;color:var(--white);word-break:break-word}
.footer__contact .footer__note{margin-top:12px}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding-block:18px 28px;
  border-top:1px solid var(--line);
  color:var(--muted);font-size:12.5px;
}
.footer__copy{margin:0;letter-spacing:.04em}
.footer__copy .mono{color:var(--muted)}
.footer__legal-links{list-style:none;display:flex;flex-wrap:wrap;gap:18px;margin:0;padding:0}
.footer__legal-links a{color:var(--cyan);font-weight:700;transition:color .18s ease}
.footer__legal-links a:hover{color:var(--yellow)}
@media (min-width:760px){
  .footer__grid{grid-template-columns:1.5fr 1fr}
}
@media (min-width:1080px){
  .footer__grid{grid-template-columns:1.35fr .8fr 1fr}
}

/* 阅读时间轴与返回顶部 */
.read-meter{position:fixed;left:0;right:0;bottom:0;z-index:130;height:3px;background:rgba(43,54,72,.55)}
.read-meter__fill{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,var(--cyan),var(--yellow))}
.to-top{
  position:fixed;right:clamp(12px,3vw,28px);bottom:clamp(16px,3vw,30px);z-index:135;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  border:1px solid var(--line);background:rgba(14,22,34,.96);color:var(--white);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .22s ease,transform .22s ease,color .18s ease,box-shadow .18s ease;
}
.to-top[data-visible="true"]{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{color:var(--yellow);box-shadow:inset 0 0 0 1px var(--cyan)}
.to-top__icon{color:var(--yellow);font-size:13px;line-height:1}

/* 入场显现 */
[data-reveal]{opacity:1}
.js-ready [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.22,.68,.32,1);
}
.js-ready [data-reveal].is-in{opacity:1;transform:none}

/* 响应式：头部 */
@media (max-width:1100px){
  .brand-bar__support{display:none}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .nav-band__inner{gap:10px}
  .nav-band__meta{margin-left:auto;order:2;font-size:10px}
  .site-nav{flex-basis:100%;order:3;display:none;margin-top:8px;padding-top:6px;border-top:1px solid var(--line)}
  .site-header[data-open="true"] .site-nav{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__list a{padding:14px 4px;border-bottom:1px solid rgba(43,54,72,.6);font-size:15px}
  .site-nav__list a::after{left:4px;right:auto;width:26px;bottom:8px}
  .site-nav__list a[aria-current="page"]{background:linear-gradient(90deg,rgba(242,255,58,.1),transparent 70%)}
}
@media (max-width:640px){
  .brand-bar__hours{display:none}
  .brand-bar__inner{min-height:58px;gap:10px}
  .brand__mark{width:46px;height:34px;font-size:12px}
  .brand__name{font-size:13.5px}
  .brand-bar__cta{margin-left:auto;padding:9px 13px;font-size:12px;letter-spacing:.03em}
  .footer__row{grid-template-columns:1fr;gap:2px}
  .footer__legal{flex-direction:column;align-items:flex-start}
}

/* 减少动效 */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .to-top{transition:none}
}