:root{
  --bg:#E6EFF9;--panel:#F7FAFE;--panel-2:#D6E4F3;--border:#C3D3E6;
  --accent:#D9412E;--accent-dark:#A82D1F;--text:#13202F;--muted:#52637A;
  --success:#1E9E62;--warn:#D08A0B;--error:#B4232F;
  --white:#FFFFFF;--ring:#CFE2F6;--ring-hover:#BDD6F0;--ring-line:#A9C7E7;
  --line:#E2EBF5;--placeholder:#8494A9;--ink-2:#2A4565;--ink-hi:#26384D;
  --accent-tint:#FBE4DF;--success-tint:#DDF2E7;--cream-field:#FFF7E4;
  --sky-top:#A9CDEE;--sky-mid:#C6DDF3;--sun:#FFF4DA;--sun-yellow:#EDB03C;
  --city-far:#B7CDE4;--city-mid:#8FAED0;--city-near:#6C8FB8;
  --win-far:#CEDDEE;--win-mid:#ADC5E0;--win-near:#8BAACF;
  --tree-dark:#5C9196;--tree-mid:#7DAFAC;--tree-light:#B8DACB;
  --cloud-mid:#EEF5FC;--cloud-shade:#CFE0F2;--flag-red:#D4463B;--flag-blue:#2D4B8B;
  --bg-rgb:230,239,249;--sky-rgb:46,120,196;--ink-rgb:19,32,47;
  --white-rgb:255,255,255;--ring-rgb:207,226,246;--sun-rgb:255,244,218;
  --sunY-rgb:237,176,60;--shade-rgb:40,70,110;--success-rgb:30,158,98;
  --r-xs:6px;--r-s:9px;--r-m:14px;--r-float:12px;--r-device:8px;--r-roof:2px;--r-circle:50%;--r-pill:999px;
  --shadow-sky:0 28px 64px -18px rgba(var(--sky-rgb),.12),0 10px 26px -12px rgba(var(--sky-rgb),.12);
  --shadow-float:0 20px 44px -16px rgba(var(--sky-rgb),.26),0 4px 12px -6px rgba(var(--sky-rgb),.12);
  --f-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --f-body:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei','Hiragino Sans','Malgun Gothic',system-ui,sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --fs-xs:11.5px;--fs-caption:12.5px;--fs-small:13.5px;--fs-nav:14.5px;--fs-button:15px;
  --fs-body:16px;--fs-lede:16.5px;--fs-prompt:19px;--fs-brand:20px;--fs-h3:24px;
  --fs-h2:34px;--fs-h1:clamp(52px,4.75vw,68px);--fs-mobile-h1:clamp(28px,7.6vw,40px);
  --weight-normal:400;--weight-medium:600;--weight-bold:700;--weight-heavy:800;
  --leading-body:1.6;--leading-title:1.12;--tracking-title:-.02em;
  --wrap:1240px;--reading:820px;--gutter:24px;--section-space:72px;
  --header-height:84px;--anchor-offset:100px;--toc-offset:164px;
  --transition:.2s ease;--reveal-duration:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:var(--fs-body);line-height:var(--leading-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit;color:inherit}
button,summary{cursor:pointer}
button{border:0}
img,svg{display:block;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
h1,h2,h3{font-family:var(--f-display);font-weight:var(--weight-heavy);letter-spacing:var(--tracking-title);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);line-height:var(--leading-title)}
h2{font-size:var(--fs-h2);line-height:1.22}
h3{font-size:var(--fs-h3);line-height:1.3}
p{margin:0 0 1em}
code{font-family:var(--f-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border-radius:var(--r-s)}
pre code{overflow-wrap:normal;white-space:pre}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--text);outline-offset:3px}
[hidden]{display:none!important}
:where(.grid,.panel,.card,.wrap,.reading-wrap)>*{min-width:0}
.no-break{white-space:nowrap}
.mono{font-family:var(--f-mono)}
.muted{color:var(--muted)}
.hot{color:var(--accent)}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.panel,.card{background:var(--panel);border:1px solid var(--white);border-radius:var(--r-m);box-shadow:var(--shadow-sky);padding:28px}
.grid{display:grid;gap:24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:1.7em}
.prose h3{margin-top:1.4em}
.prose a{color:var(--ink-2)}
.prose ol{padding-left:24px}
.badge,.tag{display:inline-flex;align-items:center;min-height:28px;padding:3px 10px;border-radius:var(--r-xs);background:var(--panel-2);color:var(--ink-2);font-size:var(--fs-caption);font-weight:var(--weight-bold);max-width:100%;overflow:hidden;overflow-wrap:anywhere}
.badge-success{background:var(--success-tint);color:var(--text)}
.badge-warm{background:var(--sun);color:var(--text)}
.btn,.btn-ink,.btn-primary,.btn-ghost,.btn-secondary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 20px;
  border-radius:var(--r-pill);font-size:var(--fs-button);font-weight:var(--weight-bold);
  text-decoration:none;white-space:nowrap;flex-shrink:0;line-height:1.4;
  transition:transform var(--transition),box-shadow var(--transition),background var(--transition)
}
.btn-ink,.btn-primary{background:linear-gradient(180deg,var(--ink-hi),var(--text));color:var(--white);box-shadow:inset 0 1px 0 rgba(var(--white-rgb),.18),0 10px 20px -10px rgba(var(--ink-rgb),.6)}
.btn-ink:hover,.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 rgba(var(--white-rgb),.18),0 14px 26px -12px rgba(var(--ink-rgb),.6)}
.btn-ghost,.btn-secondary{padding-inline:16px;background:rgba(var(--ring-rgb),.4);border:1px solid var(--ring-line);color:var(--text);font-size:var(--fs-nav)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--ring)}
.btn-ink:active,.btn-primary:active{transform:translateY(1px)}
.btn:disabled,.btn-ink:disabled,.btn-ghost:disabled{opacity:.5;cursor:not-allowed;transform:none}
.arr{display:inline-block;transition:transform var(--transition)}
.btn-ink:hover .arr{transform:translateX(2px)}
.topbar{position:relative;z-index:60;padding:16px 24px 0}
#site-header{position:relative;z-index:60;min-height:76px}
.navcap{
  max-width:var(--wrap);margin:0 auto;height:60px;display:flex;align-items:center;gap:20px;padding:0 10px 0 18px;
  border-radius:var(--r-pill);background:rgba(var(--ring-rgb),.62);border:1px solid rgba(var(--white-rgb),.6);
  box-shadow:inset 0 1px 0 rgba(var(--white-rgb),.75),0 12px 32px -16px rgba(var(--sky-rgb),.4);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);backdrop-filter:blur(14px) saturate(1.2)
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand-mark{display:block;width:32px;height:32px;flex-shrink:0}
.brand-mark img{width:32px;height:32px}
.brand-en{font-family:var(--f-display);font-weight:var(--weight-heavy);font-size:var(--fs-brand);letter-spacing:var(--tracking-title)}
.desktop-nav{flex:1;min-width:0;height:100%}
.navtabs{list-style:none;margin:0;padding:0;display:flex;align-items:center;justify-content:center;gap:2px;height:100%}
.navtabs li{height:100%;min-width:0}
.navtabs a{position:relative;display:flex;align-items:center;justify-content:center;height:100%;padding:0 10px;font-size:var(--fs-nav);font-weight:var(--weight-medium);color:rgba(var(--ink-rgb),.74);text-decoration:none;white-space:nowrap;transition:color var(--transition)}
.navtabs a:hover,.navtabs a[aria-current="page"]{color:var(--text)}
.navtabs a[aria-current="page"]::after{content:"";position:absolute;left:10px;right:10px;bottom:9px;height:3px;border-radius:var(--r-xs);background:var(--text)}
.navend{display:flex;align-items:center;gap:6px;flex-shrink:0;flex-wrap:nowrap}
.lang-wrap{position:relative}
.lang{display:flex;align-items:center;justify-content:center;gap:6px;min-height:40px;min-width:44px;width:auto;padding:0 10px;border:0;border-radius:var(--r-pill);background:transparent;font-size:var(--fs-small);font-weight:var(--weight-medium);color:var(--muted);cursor:pointer}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{background:rgba(var(--white-rgb),.5);color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:80;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-m);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-s)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;background:transparent;color:var(--text);border-radius:var(--r-s)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;flex-shrink:0}
.mobile-drawer{position:fixed;top:var(--header-height);left:16px;right:16px;z-index:55;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-m);padding:16px 20px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 14px;text-decoration:none;border-radius:var(--r-s);font-weight:var(--weight-medium)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
.menu-veil{position:fixed;top:var(--header-height);inset-inline:0;bottom:0;z-index:50;background:rgba(var(--ink-rgb),.24)}
.footer{margin-top:48px;padding-top:48px;padding-bottom:24px;background:var(--panel-2);border-top:1px solid var(--white)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer-brand p{margin-top:18px;color:var(--muted);max-width:36ch}
.footer-title{font-size:var(--fs-body);font-weight:var(--weight-bold);margin:0 0 12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 18px}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none;font-size:var(--fs-small)}
.footer-links a:hover{text-decoration:underline}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:32px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--fs-caption);color:var(--muted)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:28px}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--fs-small)}
.reveal{transition:opacity var(--reveal-duration) ease,transform var(--reveal-duration) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:80px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.counter-value,[data-count]{display:inline-block;min-width:3ch;font-family:var(--f-mono);font-variant-numeric:tabular-nums}
@media(min-width:1101px) and (max-width:1350px){
  .navcap{gap:12px}
  .navtabs a{padding-inline:8px;font-size:var(--fs-small)}
  .navend{gap:2px}
  .lang{padding-inline:6px}
}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .navend{margin-left:auto}
  .menu-toggle{display:flex}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--section-space:48px;--fs-h2:28px}
  h1{font-size:var(--fs-mobile-h1)}
  .grid{grid-template-columns:minmax(0,1fr)}
  .topbar{padding:12px 16px 0}
  .navcap{padding-inline:12px 6px;gap:8px}
  .footer-grid{gap:24px}
}
@media(max-width:640px){
  :root{--gutter:16px;--fs-h3:21px;--header-height:80px}
  .no-break{white-space:normal}
  .topbar{padding-inline:12px}
  .navcap{height:56px}
  .brand{gap:6px}
  .brand-en{font-size:var(--fs-body)}
  .brand-mark,.brand-mark img{width:27px;height:27px}
  .navend{gap:2px;margin-left:auto}
  .navend .btn-ink{min-height:38px;padding:8px 12px;font-size:var(--fs-small)}
  .lang{padding:0 6px;font-size:var(--fs-xs)}
  .lang svg{display:none}
  .panel,.card{padding:22px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .tilt,.decor-tilt,[data-tilt]{transform:none}
  .shell,.atmo,.decorated-section{max-width:100%;overflow-x:clip}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}