:root{
  --c-bg:#E6EEF2;
  --c-panel:#F7FAFB;
  --c-panel-2:#D9E5EB;
  --c-border:#C8D6DE;
  --c-border-soft:rgba(200,214,222,.72);
  --c-accent:#1B4D5C;
  --c-accent-dk:#12363F;
  --c-accent-soft:#2D6A7B;
  --c-text:#142B30;
  --c-muted:#4E636A;
  --c-success:#2E8A5A;
  --c-warn:#C17F2A;
  --c-error:#BF443C;
  --c-apricot:#F6DFC6;
  --c-apricot-line:#E6BE92;
  --c-hero-top:#EEF3F6;
  --c-hero-bot:#DEE8ED;
  --c-field:#EEF3F6;
  --c-bar:rgba(238,243,246,.82);
  --c-clear:transparent;
  --c-veil:rgba(20,43,48,.3);
  --glow-apricot:rgba(232,170,112,.09);
  --hi:rgba(255,255,255,.9);
  --hi-edge:rgba(255,255,255,.42);
  --hi-on-dark:rgba(255,255,255,.16);
  --gloss:rgba(255,255,255,.2);
  --shadow-1:rgba(27,77,92,.06);
  --shadow-2:rgba(27,77,92,.10);
  --shadow-3:rgba(27,77,92,.18);
  --spark-halo:rgba(230,190,146,.55);
  --flag-edge:rgba(20,43,48,.16);
  --tk-sky-1:#6C6690;
  --tk-sky-2:#3A4A73;
  --tk-sky-3:#1F3253;
  --tk-b1:#465781;
  --tk-b2:#2B3B60;
  --tk-b3:#17253E;
  --hk-sky-1:#5A909C;
  --hk-sky-2:#245A69;
  --hk-sea-1:#1B4D5C;
  --hk-sea-2:#0E2C35;
  --hk-hill:#173F4A;
  --hk-city:#0F2E37;
  --sg-sky-1:#82B5C4;
  --sg-sky-2:#CBE0E6;
  --sg-sky-3:#EEF4F6;
  --sg-arc-1:#A9C8D0;
  --sg-arc-2:#7FA6B1;
  --sg-tower:#5A8793;
  --la-sky-1:#BBD4DB;
  --la-sky-2:#E7D9C6;
  --la-sky-3:#F2CDA6;
  --la-r1:#A3B7BA;
  --la-r2:#7A959B;
  --la-r3:#4C6B73;
  --flag-red:#C8414B;
  --flag-blue:#2F4B8C;
  --flag-white:#FFFFFF;
  --flag-black:#23272B;
  --flag-gold:#E4B43E;
  --r-card:10px;
  --r-tag:8px;
  --r-focus:6px;
  --r-flag:3px;
  --r-pill:999px;
  --r-circle:50%;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",Georgia,"Times New Roman",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-normal:400;
  --weight-medium:500;
  --weight-strong:600;
  --text-xs:12px;
  --text-sm:14px;
  --text-body:16px;
  --text-lead:20px;
  --text-h1:64px;
  --text-h2:40px;
  --text-h3:28px;
  --leading-body:1.8;
  --tracking-title:-.02em;
  --gutter:24px;
  --content-width:1200px;
  --header-height:72px;
  --toc-height:64px;
  --anchor-offset:152px;
  --edge-hi:inset 0 1px 0 var(--hi);
  --shadow-float:0 22px 44px -18px var(--shadow-3),0 4px 12px -4px var(--shadow-2);
  --shadow-card:var(--edge-hi),0 16px 40px -20px var(--shadow-2);
  --ease-quick:.2s ease;
  --ease-reveal:.35s ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 16px)}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--font-body);font-size:var(--text-body);font-weight:var(--weight-normal);line-height:var(--leading-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,select{max-width:100%}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--c-accent);outline-offset:3px;border-radius:var(--r-focus)}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-normal);letter-spacing:var(--tracking-title);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.8vw,68px);line-height:1.16;margin:0 0 24px}
h2{font-size:var(--text-h2);margin:0 0 24px}
h3{font-size:var(--text-h3);margin:0 0 16px}
p{margin:0 0 20px}
strong,b{font-weight:var(--weight-strong)}
ul,ol{padding-left:24px}
li+li{margin-top:6px}
code,kbd,pre,.mono{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--c-panel-2);border-radius:var(--r-card)}
pre code{overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--c-border);margin:32px 0}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:88px;padding-bottom:88px}
.section-head{max-width:720px;margin-bottom:40px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.flex-row{display:flex;align-items:center;flex-wrap:wrap;gap:16px}
.flex-row>*{min-width:0}
.muted{color:var(--c-muted)}
.small{font-size:var(--text-sm)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;display:inline-block;vertical-align:middle;flex:none}
.panel,.card{min-width:0;background:var(--c-panel);border:1px solid var(--c-border-soft);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:28px}
.panel-inset{background:var(--c-panel-2);border-radius:var(--r-card);padding:24px;min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 30px;border:0;border-radius:var(--r-pill);font-family:var(--font-body);font-size:var(--text-body);font-weight:var(--weight-medium);letter-spacing:.01em;line-height:1.4;text-align:center;white-space:nowrap;flex-shrink:0;transition:transform var(--ease-quick),background var(--ease-quick)}
.btn svg{width:16px;height:16px;display:block}
.btn-solid,.btn-primary{background:var(--c-accent);color:var(--c-panel);box-shadow:inset 0 1px 0 var(--hi-on-dark),0 12px 26px -12px var(--shadow-3)}
.btn-solid:hover,.btn-primary:hover,.btn.is-hover{background:var(--c-accent-dk);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--c-clear);border:1.5px solid var(--c-text);color:var(--c-text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--c-panel);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);box-shadow:none;cursor:not-allowed;transform:none}
.btn.is-focus{outline:2px solid var(--c-accent);outline-offset:3px}
.text-link{color:var(--c-accent);text-decoration:underline;text-underline-offset:4px}
.topbar{position:sticky;top:0;z-index:50;height:var(--header-height)}
.topbar-in{position:relative;z-index:53;max-width:1320px;height:100%;margin:0 auto;padding:0 40px;display:flex;align-items:center;flex-wrap:nowrap;gap:0;background:var(--c-bar);-webkit-backdrop-filter:saturate(1.2) blur(12px);backdrop-filter:saturate(1.2) blur(12px)}
.topbar::before{content:"";position:absolute;inset:0;background:var(--c-bar);border-bottom:1px solid var(--c-border-soft)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand img{width:32px;height:32px}
.brand-word{font-size:19px;font-weight:var(--weight-strong);letter-spacing:-.01em;color:var(--c-text);white-space:nowrap}
.tabs{margin-left:42px;height:100%;flex:1;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;height:100%;gap:2px}
.tabs li{height:100%;margin:0}
.tabs a{position:relative;display:flex;align-items:center;justify-content:center;height:100%;padding:0 12px;font-size:15px;color:var(--c-muted);white-space:nowrap}
.tabs a::after{content:"";position:absolute;left:12px;right:12px;bottom:0;height:2px;border-radius:var(--r-tag);background:var(--c-accent);transform:scaleX(0);transition:transform .25s ease}
.tabs a:hover{color:var(--c-text)}
.tabs a:hover::after{transform:scaleX(.35)}
.tabs a[aria-current="page"]{color:var(--c-text);font-weight:var(--weight-medium)}
.tabs a[aria-current="page"]::after{transform:scaleX(1)}
.topbar-act{margin-left:auto;display:flex;align-items:center;gap:14px;flex-shrink:0}
.language{position:relative}
.lang{appearance:none;border:0;background:var(--c-clear);font-size:14px;color:var(--c-muted);min-height:44px;min-width:44px;width:auto;padding:8px 10px;border-radius:var(--r-tag);display:flex;align-items:center;justify-content:center;gap:6px}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px;display:block}
.lang:hover{background:var(--c-panel-2);color:var(--c-text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:60;width:190px;padding:8px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-tag);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--c-panel-2);color:var(--c-accent)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 22px;border:1.5px solid var(--c-text);border-radius:var(--r-pill);font-size:15px;font-weight:var(--weight-medium);white-space:nowrap;transition:transform var(--ease-quick)}
.btn-login:hover{background:var(--c-text);color:var(--c-panel);transform:translateY(-1px)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;background:var(--c-clear);color:var(--c-text);border:1px solid var(--c-border);border-radius:var(--r-tag)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:52;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--c-panel);padding:20px var(--gutter) 40px}
.menu-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:10px 16px;border-radius:var(--r-tag)}
.menu-drawer a:hover,.menu-drawer a[aria-current="page"]{background:var(--c-panel-2);color:var(--c-accent)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--c-border)}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:51;background:var(--c-veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:64px;padding-bottom:28px;background:var(--c-panel-2);border-top:1px solid var(--c-border)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:18px;color:var(--c-muted);font-size:14px}
.footer-title{font-family:var(--font-body);font-size:14px;font-weight:var(--weight-strong);margin:0 0 16px;letter-spacing:0}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 20px}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--c-muted)}
.footer-links a:hover{color:var(--c-accent);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--c-border);font-size:12px;color:var(--c-muted)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 16px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.prose{max-width:800px;min-width:0}
.prose p,.prose li{overflow-wrap:anywhere}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not(.btn){color:var(--c-accent);text-decoration:underline;text-underline-offset:3px}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:160px;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
.decorated,.tilt-region{position:relative;overflow-x:clip}
@media(min-width:1024px) and (max-width:1279px){
  .topbar-in{padding-inline:24px}
  .tabs{margin-left:24px}
  .tabs a{font-size:14px;padding-inline:9px}
  .topbar-act{gap:8px}
}
@media(max-width:1100px){
  .tabs{display:none}
  .menu-toggle{display:flex}
  .topbar-in{padding-inline:20px}
  .topbar-act{margin-left:auto}
}
@media(min-width:1101px){.menu-drawer,.menu-veil{display:none!important}}
@media(max-width:768px){
  :root{--text-h2:32px;--text-h3:24px;--gutter:20px}
  h1{font-size:40px}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .btn{min-height:48px;padding-inline:24px;font-size:15px}
  .lang span{display:none}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  h1{font-size:34px}
  .grid-two,.footer-grid{grid-template-columns:1fr}
  .panel,.card{padding:22px}
  .topbar-in{padding-inline:16px}
  .topbar-act{gap:6px;margin-left:auto}
  .brand{gap:7px}
  .brand-word{font-size:17px}
  .brand img{width:28px;height:28px}
  .btn-login{padding-inline:14px;font-size:14px}
  .lang{padding-inline:8px}
  .tilt,.tilt-region{transform:none}
  .decorated>*{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn-login,.tabs a::after{transition:none}
}