:root{
  color-scheme:light;
  --bg:#E3E8F0;
  --bg-top:#EEF1F7;
  --panel:#F6F8FC;
  --panel-2:#D6DDEA;
  --border:#C6CFDE;
  --accent:#4E7F17;
  --accent-dark:#36590E;
  --accent-soft:#A7C98A;
  --text:#121722;
  --muted:#566176;
  --success:#2F8A5B;
  --warn:#B9770F;
  --error:#C0393B;
  --mist:#C8C2E6;
  --steel:#9EB2D8;
  --steel-deep:#6F84AE;
  --moss-mist:#D5E0C6;
  --win:#171B26;
  --win-bar:#1D2230;
  --ink-2:#2A3346;
  --white:#FFFFFF;
  --flag-red:#C8383F;
  --flag-blue:#2C3F72;
  --flag-white:#F7F8FB;
  --flag-black:#1B1E25;
  --flag-gold:#E2B53C;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Kaku Gothic ProN","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xl:20px;
  --r-md:12px;
  --r-sm:8px;
  --r-xs:6px;
  --r-flag:5px;
  --r-pill:999px;
  --r-round:50%;
  --wrap:1344px;
  --reading:800px;
  --gutter:32px;
  --header-height:64px;
  --toc-height:64px;
  --anchor-offset:152px;
  --text-xs:12px;
  --text-sm:14px;
  --text-body:15px;
  --text-md:17px;
  --text-lg:20px;
  --text-h3:24px;
  --text-h2:36px;
  --text-h1:68px;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --shadow-moss:0 34px 70px -26px color-mix(in srgb,var(--accent) 12%,transparent);
  --shadow-inset:inset 0 1px 0 color-mix(in srgb,var(--white) 80%,transparent);
  --ease-ui:cubic-bezier(.2,.6,.3,1);
  --time-ui:.2s;
  --time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font-body);font-size:var(--text-body);line-height:1.6;color:var(--text);
  -webkit-font-smoothing:antialiased;
  background:linear-gradient(180deg,color-mix(in srgb,var(--mist) 5%,transparent),color-mix(in srgb,var(--steel) 5%,transparent)) 0 0/100% 920px no-repeat,linear-gradient(180deg,var(--bg-top),var(--bg) 920px) 0 0/100% 920px no-repeat,var(--bg);
}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:transparent}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-sm)}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0}
button svg{pointer-events:none}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-regular);line-height:1.2;text-wrap:balance}
h1{font-size:clamp(52px,5vw,var(--text-h1));letter-spacing:var(--tracking-display);margin:0 0 24px}
h2{font-size:var(--text-h2);letter-spacing:var(--tracking-cjk);margin:0 0 24px}
h3{font-size:var(--text-h3);margin:0 0 16px}
:lang(zh-CN) h1,:lang(zh-TW) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--tracking-cjk)}
p{margin:0 0 20px}
ul,ol{padding-left:24px}
li+li{margin-top:6px}
pre,code,kbd{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin:24px 0}
table{border-collapse:collapse}
th,td{word-break:keep-all}
th{text-align:left}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section--compact{padding-top:40px;padding-bottom:40px}
.section-heading{max-width:760px;margin-bottom:40px}
.section-heading p,.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
:where(.grid,.card-grid,.platform-grid,.footer-grid,.feature-layout,.feature-items,.stage)>*{min-width:0}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--panel);box-shadow:var(--shadow-inset)}
.panel{position:relative;border-radius:var(--r-xl);overflow:hidden;isolation:isolate;box-shadow:var(--shadow-moss)}
.panel::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:5;box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--white) 38%,transparent)}
.decor-region{position:relative;overflow-x:clip;max-width:100%}
.btn,.btn-ink,.btn-primary,.btn-secondary,.btn-login{
  display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:8px;
  min-height:48px;padding:0 30px;border:0;border-radius:var(--r-pill);
  font-size:16px;font-weight:var(--weight-medium);line-height:1.3;white-space:nowrap;
  background:var(--text);color:var(--panel);
  box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 14%,transparent),0 14px 28px -16px color-mix(in srgb,var(--text) 55%,transparent);
  transition:background-color var(--time-ui) var(--ease-ui),color var(--time-ui) var(--ease-ui);
}
.btn:hover,.btn-ink:hover,.btn-primary:hover,.btn-login:hover{background:var(--ink-2)}
.btn-secondary{background:var(--panel);color:var(--text);border:1px solid var(--border);box-shadow:var(--shadow-inset)}
.btn-secondary:hover{background:var(--panel-2)}
:where(.btn,.btn-primary,.btn-secondary):disabled,:where(.btn,.btn-primary,.btn-secondary)[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;cursor:not-allowed}
.btn-login{min-height:36px;padding-inline:20px;font-size:var(--text-sm);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 14%,transparent)}
.link-under{display:inline-flex;align-items:center;min-height:24px;font-size:16px;padding-bottom:3px;border-bottom:1.5px solid var(--text)}
.link-under:hover{color:var(--muted);border-color:var(--muted)}
.arrow-link{display:inline-flex;align-items:center;gap:10px;min-height:32px}
.arrow-link:hover{text-decoration:underline;text-underline-offset:4px}
.topbar{position:relative;z-index:100;background:transparent}
.topbar__in{display:flex;align-items:center;flex-wrap:nowrap;height:var(--header-height);gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:36px}
.brand__mark{width:30px;height:30px}
.brand__en{font-family:var(--font-display);font-size:18px;font-weight:var(--weight-semibold);letter-spacing:-.01em;color:var(--text)}
.brand__zh{font-size:var(--text-sm);font-weight:var(--weight-regular);color:var(--muted)}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav li{margin:0}
.mainnav a{display:inline-flex;align-items:center;justify-content:center;height:34px;padding-inline:13px;border-radius:var(--r-pill);font-size:var(--text-sm);color:var(--muted);white-space:nowrap;transition:color var(--time-ui),background-color var(--time-ui)}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);background:var(--panel);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--border) 70%,transparent),0 1px 2px color-mix(in srgb,var(--text) 8%,transparent)}
.topbar__tools{display:flex;align-items:center;flex-shrink:0;gap:14px}
.langbox{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;width:auto;min-width:44px;min-height:36px;padding:0;border:0;background:transparent;font-size:var(--text-sm);color:var(--muted);white-space:nowrap}
.lang svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.6}
.lang__text{white-space:nowrap}
.lang__caret{font-size:11px}
.lang-menu{position:absolute;right:0;top:calc(100% + 10px);z-index:120;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:var(--shadow-moss)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--panel-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{display:none;position:fixed;inset:var(--header-height) 0 auto;z-index:90;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer ul{list-style:none;padding:0;margin:0}
.mobile-drawer li{margin:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--panel-2)}
.drawer-languages{margin-top:20px;border-top:1px solid var(--border);padding-top:16px}
.menu-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:80;border:0;background:color-mix(in srgb,var(--text) 30%,transparent)}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:color-mix(in srgb,var(--panel-2) 45%,var(--bg));padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1.3fr 1fr 1fr;gap:40px}
.footer-brand p{max-width:320px;margin-top:18px;color:var(--muted)}
.footer-title{font-size:var(--text-sm);font-weight:var(--weight-medium);margin:0 0 16px}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-sm);color:var(--muted)}
.footer-links a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--text-xs);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.reveal{transition:opacity var(--time-reveal) var(--ease-ui),transform var(--time-reveal) var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.prose{line-height:1.85;overflow-wrap:break-word;min-width:0}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose :where(ul,ol){margin-block:20px}
@media(min-width:981px) and (max-width:1320px){
  .topbar__in{gap:16px}
  .mainnav a{padding-inline:9px;font-size:13px}
  .topbar__tools{gap:10px}
}
@media(max-width:1180px){.brand__zh{display:none}}
@media(max-width:980px){
  .mainnav{display:none}
  .topbar__tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  html.nav-open .mobile-drawer,html.nav-open .menu-veil{display:block}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:18px;--text-h2:28px;--text-h3:22px}
  h1{font-size:40px;line-height:1.15}
  .section{padding-top:48px;padding-bottom:48px}
  .card-grid{grid-template-columns:1fr}
  .topbar__in{gap:12px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .lang__text{display:none}
  .topbar__tools{gap:8px;margin-left:auto}
  .brand{gap:7px}
  .brand__en{font-size:16px}
  .btn-login{padding-inline:14px}
  .tilt,[data-tilt]{transform:none}
  .decor-region{max-width:100%;overflow-x:clip}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .card{padding:22px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}