:root{
  color-scheme:dark;
  --ink:#000000;
  --panel:#0a0b0f;
  --panel2:#121212;
  --line:#1c2030;
  --line2:#2a3350;
  --fg:#e9ecf3;
  --dim:#98a0b3;
  --accent:#6f9dff;
  --accent-dim:#24407c;
  --gold:#d8b26a;
  --rail:236px;
  --r:4px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  padding-left:var(--rail);
  background:var(--ink);
  color:var(--fg);
  font:300 17px/1.72 Roboto,"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  letter-spacing:.012em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
h1,h2,h3{font-family:Newsreader,Georgia,"Songti SC",serif;font-weight:600;line-height:1.22;letter-spacing:-.008em;margin:0}
p{margin:0 0 1em}
a{color:var(--accent)}
button{font:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

.skip{
  position:absolute;left:8px;top:-60px;z-index:99;
  background:var(--panel2);color:var(--fg);text-decoration:none;
  padding:12px 16px;border:1px solid var(--line2);border-radius:var(--r);
  transition:top .18s ease;
}
.skip:focus{top:8px}

/* ---- left rail ---- */
.rail{
  position:fixed;inset:0 auto 0 0;width:var(--rail);z-index:50;
  display:flex;flex-direction:column;gap:20px;
  padding:22px 16px 24px;
  background:linear-gradient(180deg,#080a10 0%,#000 58%);
  border-right:1px solid var(--line);
}
.rail-brand{display:flex}
.mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;height:44px;flex:0 0 auto;
  border:1px solid var(--line2);border-radius:var(--r);
  background:#05060a;color:var(--fg);text-decoration:none;
  transition:border-color .2s ease,box-shadow .25s ease,transform .2s ease;
}
.mark:hover,.mark:focus-visible{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-dim),0 0 16px rgba(111,157,255,.3);transform:translateY(-1px)}
.mark-glyph{font-family:Newsreader,Georgia,serif;font-weight:600;font-size:20px;color:var(--accent);text-shadow:0 0 12px rgba(111,157,255,.45)}

.rail-nav{flex:1;min-height:0;overflow-y:auto;scrollbar-width:thin}
.rail-nav ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.rail-nav a{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:10px;
  border:1px solid transparent;border-radius:var(--r);
  color:var(--dim);text-decoration:none;font-size:15px;line-height:1.3;
  transition:color .18s ease,border-color .18s ease,background .18s ease,transform .18s ease;
}
.rail-nav a:hover,.rail-nav a:focus-visible{color:var(--fg);border-color:var(--line);background:#0b0d14;transform:translateX(2px)}
.rail-nav a.is-on{color:var(--accent);border-color:var(--accent-dim);background:#080c16}
.ic{width:12px;height:12px;flex:0 0 auto;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;color:inherit}

.rail-foot{border-top:1px solid var(--line);padding-top:14px}
.rail-cta{
  display:flex;align-items:center;gap:8px;
  min-height:44px;padding:10px 12px;
  border:1px solid var(--line2);border-radius:var(--r);
  color:var(--fg);text-decoration:none;font-size:14px;
  transition:border-color .2s ease,background .2s ease,color .2s ease;
}
.rail-cta:hover,.rail-cta:focus-visible{border-color:var(--accent);background:#0a0f1c;color:var(--accent)}

/* ---- main ---- */
.main{max-width:1140px;margin:0 auto;padding:0 clamp(16px,3.2vw,40px) 44px}

.hero{position:relative;display:flex;flex-direction:column;gap:26px;min-height:45vh;padding:clamp(26px,4.6vw,52px) 0 0}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(111,157,255,.18) 1px,transparent 1px);
  background-size:22px 22px;opacity:.8;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 86%);
  mask-image:linear-gradient(180deg,#000,transparent 86%);
}
.hero-txt{position:relative;max-width:40ch}
.hero h1{
  font-size:clamp(2rem,4.6vw,3.1rem);
  text-shadow:0 0 22px rgba(111,157,255,.22);
}
.lede{position:relative;margin:14px 0 0;max-width:56ch;color:var(--dim);font-size:17px}
.hero-fig{
  position:relative;margin:0;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--r);
  background:#05070c;aspect-ratio:2.5/1;
}
.hero-fig:empty{
  min-height:170px;
  background:
    radial-gradient(circle at 24% 32%,rgba(111,157,255,.24),transparent 62%),
    radial-gradient(circle at 78% 68%,rgba(216,178,106,.14),transparent 60%),
    linear-gradient(120deg,#0a0f1c,#000 72%);
}
.hero-photo{width:100%;height:100%;object-fit:cover;opacity:.94;filter:brightness(.9) saturate(1.05);will-change:transform}

.shell{
  display:grid;grid-template-columns:minmax(0,1fr) 252px;
  gap:clamp(20px,2.6vw,38px);
  margin-top:clamp(24px,4vw,44px);
  padding-top:clamp(24px,3.6vw,40px);
  border-top:1px solid var(--line);
}

/* ---- prose ---- */
.prose{min-width:0;font-size:17px;line-height:1.78}
.prose article{padding:26px 0;border-top:1px solid var(--line2)}
.prose article:first-child{border-top:0;padding-top:0}
.prose article[id]{scroll-margin-top:86px}
.prose h2{font-size:clamp(1.35rem,2.5vw,1.85rem);color:#fff;margin:0 0 .5em}
.prose h3{font-size:clamp(1.15rem,2vw,1.4rem);color:#fff;margin:1.4em 0 .45em}
.prose strong{color:#fff;font-weight:500}
.prose p{max-width:68ch;color:#d2d8e4}
.prose ul,.prose ol{padding-left:1.25em;max-width:66ch}
.prose li{margin:.28em 0}
.prose blockquote{
  margin:1.2em 0;padding:2px 0 2px 16px;
  border-left:2px solid var(--accent-dim);color:var(--dim);
}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:#9dbcff}
.prose img{margin:14px 0;border:1px solid var(--line);border-radius:var(--r)}
.prose table{width:100%;border-collapse:collapse;font-size:16px}
.prose th,.prose td{border:1px solid var(--line2);padding:9px 11px;text-align:left}
.prose th{background:#0a0c12;font-weight:500;color:#fff}

.prose small,.side small{
  display:block;
  font-family:Roboto,system-ui,sans-serif;
  font-size:14px;font-weight:500;line-height:1.4;
  letter-spacing:.16em;color:var(--gold);
  margin-bottom:7px;
}

/* ---- aside ---- */
.side{
  position:sticky;top:24px;align-self:start;
  border:1px solid var(--line);border-radius:var(--r);
  background:linear-gradient(180deg,#0a0c12,#06070a);
  padding:18px 16px 14px;
}
.side h2{font-size:1.15rem;color:#fff;margin:0 0 12px}
.side-list{list-style:none;margin:0 0 12px;padding:0;display:flex;flex-direction:column;gap:1px}
.side-list a{
  display:flex;align-items:center;min-height:42px;padding:9px 10px;
  border:1px solid transparent;border-radius:var(--r);
  color:var(--dim);text-decoration:none;font-size:15px;line-height:1.35;
  transition:color .18s ease,background .18s ease,border-color .18s ease;
}
.side-list a:hover,.side-list a:focus-visible{color:var(--fg);background:#0b0e16;border-color:var(--line)}
.to-top{
  display:flex;align-items:center;justify-content:center;
  min-height:42px;margin-top:2px;padding-top:12px;
  border-top:1px solid var(--line);
  color:var(--dim);text-decoration:none;font-size:14px;
  transition:color .18s ease;
}
.to-top:hover,.to-top:focus-visible{color:var(--accent)}

/* ---- footer ---- */
.foot{
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  max-width:1140px;margin:0 auto;
  padding:22px clamp(16px,3.2vw,40px) 36px;
  border-top:1px solid var(--line);
}
.foot-brand{display:flex;align-items:center;gap:10px;color:var(--dim);font-size:14px}
.mark-sm{width:36px;height:36px;border-radius:var(--r)}
.mark-sm .mark-glyph{font-size:16px}
.foot-nav{flex:1 1 auto;min-width:0}
.foot-nav ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:2px 4px;justify-content:center}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:40px;padding:8px 9px;
  border:1px solid transparent;border-radius:var(--r);
  color:var(--dim);text-decoration:none;font-size:14px;
  transition:color .18s ease,border-color .18s ease;
}
.foot-nav a:hover,.foot-nav a:focus-visible{color:var(--fg);border-color:var(--line)}
.foot-meta{text-align:center;color:#79808f;font-size:14px;line-height:1.6}
.foot-meta p{margin:0}

/* ---- motion ---- */
.anim .prose article{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.anim .prose article.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .anim .prose article{opacity:1;transform:none}
}

/* ---- tablet / mobile ---- */
@media (max-width:1023px){
  body{padding-left:0}
  .rail{
    position:sticky;inset:auto;top:0;width:auto;
    flex-direction:row;align-items:center;gap:10px;
    padding:10px 12px;border-right:0;border-bottom:1px solid var(--line);
    background:rgba(0,0,0,.93);
  }
  .rail-nav{flex:1;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .rail-nav::-webkit-scrollbar{display:none}
  .rail-nav ol{flex-direction:row;gap:2px}
  .rail-nav a{white-space:nowrap;min-height:44px;padding:10px 12px;font-size:14.5px}
  .rail-nav a:hover{transform:none}
  .rail-foot{border-top:0;padding-top:0;flex:0 0 auto}
  .rail-cta{padding:10px 12px;white-space:nowrap}
  .mark{width:40px;height:40px}
  .hero{min-height:0;padding-top:24px}
  .hero-fig{aspect-ratio:1.9/1}
  .shell{grid-template-columns:minmax(0,1fr);padding-top:26px;margin-top:26px}
  .side{position:static}
  .prose article[id]{scroll-margin-top:78px}
}
@media (max-width:560px){
  .foot{flex-direction:column;align-items:center;gap:10px;text-align:center}
  .foot-nav ol{justify-content:center}
  .hero-fig{aspect-ratio:1.5/1}
  .lede{font-size:16px}
}

button[aria-expanded]{min-width:44px;min-height:44px}