:root{
  --ink-000:#060B12;
  --ink-100:#0E1720;
  --ink-200:#1C2A36;
  --cobalt:#1E4BE0;
  --cobalt-lit:#3A63FF;
  --cyan:#17B3A8;
  --orange:#FF6A1A;
  --lime:#B8FF4D;
  --violet:#7C5CFF;
  --text:#EEF5FA;
  --text-dim:#A9BCC9;
  --paper:#F4F7F9;
  --rail-w:96px;
  --topbar-h:58px;
  --shell-max:1320px;
  --font-sans:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-000);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,p,ul,ol,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;padding:0}
img,svg{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--lime);outline-offset:2px}
::selection{background:var(--cobalt);color:#fff}

.skip-link{
  position:fixed;top:8px;left:8px;z-index:120;
  padding:10px 16px;background:var(--lime);color:#06110A;
  font-size:14px;font-weight:700;letter-spacing:.02em;
  transform:translateY(-220%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 页头 ---------- */
.site-header{position:sticky;top:0;z-index:50}

.topbar{
  background:rgba(6,11,18,.94);
  border-bottom:1px solid var(--ink-200);
  backdrop-filter:blur(10px);
}
.topbar__inner{
  display:flex;align-items:center;gap:14px;
  max-width:var(--shell-max);margin:0 auto;
  min-height:var(--topbar-h);padding:0 20px;
}
.topbar__side{display:flex;align-items:center;gap:12px;margin-left:auto}
.topbar__cta{flex:none}

.brand{display:inline-flex;align-items:center;gap:10px;min-width:0;color:var(--text)}
.brand__glyph{
  display:inline-grid;place-items:center;flex:none;
  width:34px;height:26px;
  background:linear-gradient(135deg,var(--cobalt),var(--cyan));
  color:#fff;font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;
}
.brand__text{
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

.status-light{
  display:inline-flex;align-items:center;gap:8px;
  min-height:44px;padding:0 12px;
  border:1px solid var(--ink-200);
  background:rgba(14,23,32,.72);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--text-dim);
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.status-light:hover{border-color:var(--lime);color:var(--text)}
.status-light__dot{
  width:8px;height:8px;border-radius:50%;flex:none;
  background:var(--lime);
  box-shadow:0 0 0 4px rgba(184,255,77,.16);
  animation:pulse 2.6s ease-in-out infinite;
}
.status-light__meta{color:var(--text-dim)}
.status-light__date{color:var(--lime);font-weight:700;letter-spacing:.04em}
@keyframes pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 4px rgba(184,255,77,.18)}
  50%{opacity:.42;box-shadow:0 0 0 11px rgba(184,255,77,0)}
}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;border-radius:0;
  border:1px solid var(--ink-200);
  background:transparent;color:var(--text);
  font-size:15px;letter-spacing:.02em;cursor:pointer;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.btn--primary{background:var(--cobalt);border-color:var(--cobalt);color:#fff;font-weight:600}
.btn--primary:hover{background:var(--cobalt-lit);border-color:var(--cobalt-lit)}
.btn--ghost{border-color:var(--ink-200);color:var(--text)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--compact{min-height:38px;padding:0 14px;font-size:14px}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  min-height:44px;padding:0 12px;
  border:1px solid var(--ink-200);
  background:rgba(14,23,32,.92);color:var(--text);
  font-size:13px;cursor:pointer;
}
.nav-toggle__text{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em}
.nav-toggle__bars{position:relative;width:20px;height:2px;background:var(--cyan);flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:var(--cyan);
  transition:transform .18s var(--ease),top .18s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

.site-nav{
  position:fixed;top:var(--topbar-h);left:0;
  width:var(--rail-w);height:calc(100vh - var(--topbar-h));
  display:flex;flex-direction:column;
  padding:10px 0 20px;overflow-y:auto;
  background:linear-gradient(180deg,#0A131C,#060B12 72%);
  border-right:1px solid var(--ink-200);
  z-index:48;
}
.site-nav__caption{
  display:none;
  padding:0 20px 12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--text-dim);
}
.site-nav__list{display:flex;flex-direction:column}

.rail-link{
  position:relative;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  min-height:66px;padding:10px 4px;
  color:var(--text-dim);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.rail-link:hover{color:var(--text);background:rgba(23,179,168,.08)}
.rail-link__index{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:#4C6070}
.rail-link__label{font-size:12px;line-height:1.3;text-align:center;letter-spacing:.02em}
.rail-link.is-active{color:var(--text)}
.rail-link.is-active .rail-link__index{color:var(--cyan)}
.rail-link[aria-current="page"]{
  color:var(--text);
  background:linear-gradient(90deg,rgba(30,75,224,.34),rgba(23,179,168,.06));
}
.rail-link[aria-current="page"]::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;
  background:linear-gradient(180deg,var(--cobalt),var(--cyan));
}
.rail-link[aria-current="page"] .rail-link__index{color:var(--lime)}
.rail-link[aria-current="page"] .rail-link__label{font-weight:600}

.site-nav__foot{display:none;margin-top:auto;padding:16px;border-top:1px solid var(--ink-200)}
.site-nav__note{font-size:13px;line-height:1.7;color:var(--text-dim);margin-bottom:12px}
.site-nav__cta{width:100%}

.nav-scrim{
  display:none;position:fixed;inset:0;z-index:75;
  background:rgba(3,7,12,.72);border:0;
}

/* ---------- 容器与网格 ---------- */
.shell{width:100%;max-width:var(--shell-max);margin:0 auto;padding:0 20px}

.band{
  display:block;width:100%;height:3px;border:0;
  background:linear-gradient(90deg,var(--cobalt) 0%,var(--cyan) 58%,var(--lime) 100%);
}
.band--thin{height:1px}
.band--wide{height:8px}

.chapter{padding:72px 0 84px;border-top:1px solid var(--ink-200)}
.chapter:first-of-type{border-top:0}
.chapter__head{display:flex;align-items:center;gap:16px;margin-bottom:28px}
.chapter__index{
  flex:none;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.18em;color:var(--cyan);
}
.chapter__title{font-size:clamp(24px,3.4vw,38px);font-weight:800;letter-spacing:-.02em;line-height:1.25}
.chapter__rule{flex:1;height:1px;background:var(--ink-200)}
.chapter__body{display:block}

.grid{display:grid;gap:24px}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

.prose{max-width:38em;color:var(--text-dim)}
.prose p+p{margin-top:1.1em}
.prose strong{color:var(--text);font-weight:600}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(23,179,168,.4)}
.prose h3{margin:1.6em 0 .6em;font-size:20px;letter-spacing:-.01em;color:var(--text)}
.prose ul{margin-top:.8em}
.prose li{position:relative;padding-left:20px;margin-top:.45em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:10px;height:1px;background:var(--cyan)}

.breadcrumb{padding:20px 0 0;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--text-dim)}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:8px}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:#3A4A57}
.breadcrumb__link{color:var(--text-dim)}
.breadcrumb__link:hover{color:var(--cyan)}

/* ---------- 媒体容器 ---------- */
.media{
  position:relative;display:block;width:100%;
  aspect-ratio:16/9;overflow:hidden;
  border:1px solid var(--ink-200);
  background:linear-gradient(155deg,#101C26,#0A1017 62%,#0B1A24);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--ink-200) 1px,transparent 1px),
    linear-gradient(90deg,var(--ink-200) 1px,transparent 1px);
  background-size:44px 44px;opacity:.4;
}
.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--square{aspect-ratio:1/1}

/* ---------- 标签与数字 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--ink-200);
  background:rgba(14,23,32,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--text-dim);white-space:nowrap;
}
.tag--violet{color:#C3B4FF;border-color:rgba(124,92,255,.6);background:rgba(124,92,255,.12)}
.tag--orange{color:#FFB27A;border-color:rgba(255,106,26,.6);background:rgba(255,106,26,.12)}
.tag--lime{color:var(--lime);border-color:rgba(184,255,77,.5);background:rgba(184,255,77,.1)}
.tag--cyan{color:#7FE3DC;border-color:rgba(23,179,168,.55);background:rgba(23,179,168,.12)}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.num--poster{display:block;font-size:clamp(56px,13vw,150px);line-height:.86;font-weight:700;color:var(--text)}
.text-dim{color:var(--text-dim)}

/* ---------- 滚动进度与返回顶部 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:70;
  background:rgba(28,42,54,.7);pointer-events:none;
}
.scroll-progress__bar{
  width:0;height:100%;
  background:linear-gradient(90deg,var(--cobalt),var(--cyan) 62%,var(--lime));
}
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:60;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-width:48px;min-height:48px;padding:0 14px;
  border:1px solid var(--ink-200);
  background:rgba(10,18,26,.94);color:var(--cyan);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  cursor:pointer;
}
.to-top[hidden]{display:none}
.to-top:hover{border-color:var(--lime);color:var(--lime)}
.to-top__icon{font-size:15px;line-height:1}

/* ---------- 显现 ---------- */
.js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:96px;padding-bottom:36px;
  background:linear-gradient(180deg,#080E15,#050910);
  border-top:1px solid var(--ink-200);
}
.footer__grid{
  display:grid;gap:36px;
  grid-template-columns:1.6fr 1fr 1fr 1.4fr;
  padding:56px 0 40px;
}
.footer__brand{max-width:34em}
.footer__note{margin-top:18px;max-width:28em;font-size:15px;color:var(--text-dim)}
.footer__meta{margin-top:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--cyan)}
.footer__nav{min-width:0}
.footer__contact{min-width:0}
.footer__title{
  margin-bottom:14px;font-family:var(--font-mono);
  font-size:12px;font-weight:400;letter-spacing:.16em;color:var(--text-dim);
}
.footer__links li+li{margin-top:10px}
.footer__links a{font-size:15px;color:var(--text);border-bottom:1px solid transparent}
.footer__links a:hover{color:var(--cyan);border-bottom-color:rgba(23,179,168,.5)}
.footer__list li{margin-top:10px;font-size:14px;line-height:1.7;color:var(--text-dim)}
.footer__address{margin-top:12px;font-size:14px;color:var(--text-dim)}
.footer__base{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px;
  padding-top:24px;border-top:1px solid var(--ink-200);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:#64798A;
}
.footer__icp{color:var(--text-dim)}
.footer__copy{color:#64798A}
.footer__closing{margin-left:auto;color:var(--cyan)}
.footer__closing:hover{color:var(--lime)}

/* ---------- 桌面 ---------- */
@media (min-width:901px){
  body{padding-left:var(--rail-w)}
  .topbar__inner{padding-left:24px}
  .scroll-progress{left:var(--rail-w)}
}

/* ---------- 平板 ---------- */
@media (min-width:901px) and (max-width:1120px){
  .col-3{grid-column:span 6}
}
@media (max-width:1100px){
  .footer__grid{grid-template-columns:1fr 1fr;gap:32px}
}

/* ---------- 移动抽屉与单列 ---------- */
@media (max-width:900px){
  body{padding-left:0}
  .nav-toggle{display:inline-flex;position:fixed;right:16px;bottom:16px;z-index:90;background:rgba(10,18,26,.96)}
  .site-nav{
    top:0;left:auto;right:0;
    width:min(320px,86vw);height:100%;
    padding:22px 0 24px;
    border-right:0;border-left:1px solid var(--ink-200);
    background:linear-gradient(180deg,#0B1520,#060B12);
    transform:translateX(102%);
    transition:transform .22s var(--ease);
    z-index:80;
  }
  .site-nav[data-open="true"]{transform:translateX(0)}
  .site-nav__caption{display:block}
  .rail-link{flex-direction:row;justify-content:flex-start;gap:14px;min-height:56px;padding:0 20px}
  .rail-link__label{font-size:15px;text-align:left}
  .site-nav__foot{display:block}
  .nav-scrim[data-visible="true"]{display:block}
  .col-3,.col-4,.col-6,.col-8,.col-9{grid-column:span 12}
  .to-top{left:16px;right:auto;bottom:22px}
}
@media (max-width:640px){
  .topbar__inner{gap:10px;padding:0 14px}
  .brand__text{font-size:13px}
  .topbar__cta{display:none}
  .status-light{padding:0 10px;font-size:11px;letter-spacing:.08em}
  .footer__grid{grid-template-columns:1fr;gap:30px;padding:44px 0 32px}
  .footer__closing{margin-left:0}
  .chapter{padding:52px 0 60px}
  .chapter__head{gap:12px}
  .site-footer{margin-top:64px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .status-light__dot{animation:none}
  .js [data-reveal]{opacity:1;transform:none}
  .site-nav[data-open="true"]{transform:translateX(0)}
}