:root{
  --bg:#E9EAF8;--panel:#F7F7FE;--panel-2:#DCDDF2;--border:#CDCFE8;
  --accent:#6232E6;--accent-dark:#3E1AA8;--cyan:#2BB8E0;--lilac:#C9BDF7;
  --text:#171433;--muted:#5A5878;--success:#12936B;--warn:#C77A12;--error:#D2344A;
  --atmo-top:#F4F4FD;--atmo-bottom:#DFE1F4;--announce:#DCD6FB;--white:#FFFFFF;
  --accent-rgb:98 50 230;--accent-dark-rgb:62 26 168;--cyan-rgb:43 184 224;
  --white-rgb:255 255 255;--text-rgb:23 20 51;--muted-rgb:90 88 120;
  --flag-white:#FFFFFF;--flag-jp:#BC002D;--flag-sg:#EF3340;--flag-us-red:#B22234;
  --flag-us-blue:#3C3B6E;--flag-hk:#DE2910;--flag-it-green:#009246;--flag-it-red:#CE2B37;
  --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 Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-micro:10.5px;--fs-code:11px;--fs-xs:12px;--fs-small:13px;--fs-label:13.5px;
  --fs-nav:14.5px;--fs-ui:14px;--fs-button:15px;--fs-body:16px;--fs-lede:17px;
  --fs-subtitle:20px;--fs-h3:24px;--fs-h2:clamp(28px,3.4vw,42px);
  --fs-h1:clamp(52px,5vw,68px);--fs-mobile-h1:clamp(28px,8vw,40px);--fs-price:44px;
  --fw-normal:400;--fw-medium:500;--fw-semibold:600;--fw-bold:700;--fw-heavy:800;
  --r-card:24px;--r-btn:14px;--r-float:16px;--r-tag:6px;--r-pill:999px;
  --r-circle:50%;--r-small:4px;--r-tiny:2px;--r-square:0px;--r-icon:8px;--r-facts:18px;
  --gutter:24px;--wrap:1200px;--head-height:64px;--anchor-offset:88px;--toc-offset:144px;
  --glass:rgb(var(--white-rgb) / 40%);--hairline-white:rgb(var(--white-rgb) / 78%);
  --shadow-tint:0 24px 64px rgb(var(--accent-rgb) / 10%);
  --shadow-float:inset 0 1px 0 rgb(var(--white-rgb) / 92%),0 22px 54px rgb(var(--accent-rgb) / 10%),0 2px 8px rgb(var(--accent-dark-rgb) / 6%);
  --shadow-query:0 0 0 8px rgb(var(--accent-rgb) / 11%),0 36px 90px rgb(var(--accent-rgb) / 12%),0 2px 6px rgb(var(--accent-dark-rgb) / 8%);
  --grad-cta-end:color-mix(in srgb,var(--accent) 50%,var(--cyan));
  --grad-kw-end:color-mix(in srgb,var(--accent) 42%,var(--cyan));
  --gradient-cta:linear-gradient(135deg,var(--accent-dark),var(--accent) 52%,var(--grad-cta-end));
  --gradient-stage:linear-gradient(180deg,var(--atmo-top),var(--bg) 52%,var(--atmo-bottom));
  --gradient-demo:linear-gradient(135deg,var(--accent),var(--lilac) 58%,var(--cyan));
  --ease:cubic-bezier(.4,0,.2,1);--time-fast:.2s;--time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:rgb(var(--accent-rgb) / 12%)}
button{border:0}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-tag)}
[hidden]{display:none!important}
img,svg{vertical-align:middle;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--fw-heavy);line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);letter-spacing:-.02em}
h2{font-size:var(--fs-h2);letter-spacing:-.02em}
h3{font-size:var(--fs-h3)}
p{margin:0 0 1.2em}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border-radius:var(--r-btn)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin-inline:0}
.grid>*{min-width:0}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:80px;padding-bottom:80px}
.reading-wrap{max-width:840px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2,.prose h3{margin-top:1.6em}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li{margin-bottom:.6em}
.prose img{display:block}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;flex-shrink:0}
.panel,.card{background:var(--panel);border:1px solid var(--hairline-white);border-radius:var(--r-card);box-shadow:var(--shadow-tint);padding:28px;min-width:0}
.grid{display:grid;gap:24px}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.btn,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:11px 20px;border-radius:var(--r-btn);font-size:var(--fs-button);font-weight:var(--fw-bold);line-height:1.4;flex-shrink:0;white-space:nowrap;transition:transform var(--time-fast) var(--ease),background-color var(--time-fast) var(--ease),box-shadow var(--time-fast) var(--ease)}
.btn-primary{color:var(--white);background:var(--gradient-cta);box-shadow:0 12px 28px rgb(var(--accent-rgb) / 22%),inset 0 1px 0 rgb(var(--white-rgb) / 30%)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgb(var(--accent-rgb) / 30%)}
.btn-secondary{background:var(--panel);border:1px solid var(--accent);color:var(--accent-dark)}
.btn-secondary:hover{background:var(--panel-2)}
.btn:active,.btn-primary:active,.btn-secondary:active{transform:translateY(0)}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled{opacity:.55;cursor:not-allowed;box-shadow:none}
.reveal{transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.counter-stat,[data-count]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:160px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.stage{position:relative;background:var(--gradient-stage);overflow-x:clip;max-width:100%}
.decorated-section{position:relative;overflow-x:clip;max-width:100%}
.fl-white{fill:var(--flag-white)}.fl-jp{fill:var(--flag-jp)}.fl-sg{fill:var(--flag-sg)}
.fl-us-r{fill:var(--flag-us-red)}.fl-us-b{fill:var(--flag-us-blue)}.fl-hk{fill:var(--flag-hk)}
.fl-it-g{fill:var(--flag-it-green)}.fl-it-r{fill:var(--flag-it-red)}
.fl-edge{fill:none;stroke:rgb(var(--text-rgb) / 14%);stroke-width:1}
.ann-toggle{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}
.announce{position:relative;background:var(--announce);color:var(--text);font-size:var(--fs-ui);line-height:1.4;z-index:20}
.announce-inner{min-height:40px;display:flex;align-items:center;justify-content:center;gap:10px;padding:8px 60px;flex-wrap:wrap}
.announce-tag{font-family:var(--font-mono);font-size:var(--fs-code);font-weight:var(--fw-semibold);letter-spacing:.06em;padding:2px 8px;border-radius:var(--r-pill);background:rgb(var(--white-rgb) / 62%);color:var(--accent-dark)}
.announce-link{display:inline-flex;align-items:center;gap:6px;font-weight:var(--fw-bold);border-bottom:1px solid transparent;min-height:24px}
.announce-link:hover{border-bottom-color:currentColor}
.announce-link svg,.announce-x svg{width:16px;height:16px}
.announce-x{position:absolute;right:14px;top:50%;transform:translateY(-50%);width:30px;height:30px;display:grid;place-items:center;border-radius:var(--r-tag);cursor:pointer;color:var(--text);background:transparent}
.announce-x:hover{background:rgb(var(--white-rgb) / 55%)}
.ann-toggle:checked+.announce{display:none}
.ann-toggle:focus-visible+.announce .announce-x{outline:2px solid var(--accent);outline-offset:2px}
.site-head,#site-header{position:relative;z-index:60}
.head-inner{max-width:1376px;margin:0 auto;height:var(--head-height);padding:0 32px;display:flex;align-items:center;gap:20px;flex-wrap:nowrap;position:relative;z-index:63}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:var(--fw-heavy);font-size:var(--fs-subtitle);letter-spacing:-.02em;color:var(--text);flex-shrink:0}
.brand img{width:34px;height:34px;flex-shrink:0;filter:drop-shadow(0 6px 12px rgb(var(--accent-rgb) / 18%))}
.brand-disc{color:var(--accent)}
.brand-zh{font-weight:var(--fw-medium);color:var(--muted)}
.nav{flex:1;min-width:0;display:flex;justify-content:center}
.nav-list{list-style:none;margin:0;padding:4px;display:flex;align-items:center;gap:2px;background:rgb(var(--white-rgb) / 55%);border:1px solid var(--hairline-white);border-radius:var(--r-pill);box-shadow:inset 0 1px 0 var(--white),0 10px 28px rgb(var(--accent-rgb) / 7%);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.nav-link{display:block;padding:7px 14px;border-radius:var(--r-pill);font-size:var(--fs-nav);font-weight:var(--fw-medium);line-height:1.4;color:var(--muted);white-space:nowrap;transition:color var(--time-fast) var(--ease),background-color var(--time-fast) var(--ease)}
.nav-link:hover{color:var(--text);background:rgb(var(--white-rgb) / 75%)}
.nav-link[aria-current="page"]{background:rgb(var(--accent-rgb) / 11%);color:var(--accent-dark);font-weight:var(--fw-bold)}
.head-actions{display:flex;align-items:center;gap:8px;flex-shrink:0;margin-left:auto}
.lang{position:relative}
.lang-button,.lang summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:8px 12px;border-radius:var(--r-pill);font-size:var(--fs-ui);color:var(--muted);background:transparent;width:auto;white-space:nowrap}
.lang summary::-webkit-details-marker{display:none}
.lang-button:hover,.lang summary:hover,.lang[open] summary{background:rgb(var(--white-rgb) / 60%);color:var(--text)}
.lang-button svg,.lang summary svg{width:16px;height:16px}
.lang-caret{font-size:var(--fs-code)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);z-index:75;min-width:150px;margin:0;padding:6px;list-style:none;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-btn);box-shadow:var(--shadow-tint)}
.lang-menu a{display:flex;align-items:center;min-height:36px;padding:7px 10px;border-radius:var(--r-tag);font-size:var(--fs-ui);color:var(--text)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 16px 9px 18px;min-height:38px;border-radius:var(--r-btn);background:var(--text);color:var(--white);font-weight:var(--fw-bold);font-size:var(--fs-nav);line-height:1.4;white-space:nowrap;box-shadow:0 10px 22px rgb(var(--text-rgb) / 18%),inset 0 1px 0 rgb(var(--white-rgb) / 16%);transition:transform var(--time-fast) var(--ease)}
.login:hover{transform:translateY(-1px)}
.login svg{width:16px;height:16px}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-btn);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;transition:transform var(--time-fast) var(--ease)}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .menu-line:last-child{transform:translateY(-7px) rotate(-45deg)}
.nav-drawer{position:fixed;top:var(--head-height);right:0;left:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);z-index:62;padding:16px var(--gutter) 32px}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-btn);font-size:var(--fs-body)}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--panel-2);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;background:rgb(var(--text-rgb) / 30%);z-index:61;border-radius:var(--r-square)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-2);border-top:1px solid var(--hairline-white);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:40px}
.footer-brand{min-width:0}
.footer-brand p{margin-top:20px;max-width:360px;color:var(--muted)}
.footer-title{font-size:var(--fs-ui);font-weight:var(--fw-bold);margin:0 0 14px;color:var(--accent-dark)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 16px;list-style:none;padding:0;margin:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-ui)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{border-top:1px solid var(--border);margin-top:32px;padding-top:24px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;font-size:var(--fs-small);color:var(--muted)}
.footer-languages,.footer-legal{display:flex;flex-wrap:wrap;gap:8px 16px}
@media(min-width:1201px) and (max-width:1360px){
  .head-inner{padding-inline:24px;gap:12px}
  .nav-link{padding-inline:10px;font-size:var(--fs-ui)}
  .lang-button,.lang summary{padding-inline:8px}
}
@media(max-width:1200px){
  .nav{display:none}
  .head-actions{margin-left:auto}
  .menu-toggle{display:inline-flex}
}
@media(min-width:1201px){
  .nav-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  h1{font-size:var(--fs-mobile-h1)}
  .section{padding-top:48px;padding-bottom:48px}
  .grid-three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .head-inner{padding-inline:var(--gutter);gap:8px}
  .brand{gap:6px;font-size:var(--fs-body)}
  .brand img{width:28px;height:28px}
  .head-actions{gap:4px;margin-left:auto}
  .lang-button,.lang summary{font-size:var(--fs-xs);padding-inline:6px;gap:3px}
  .login{font-size:var(--fs-small);padding:9px 10px;gap:4px}
  .login svg{display:none}
  .panel,.card{padding:20px}
  .tilt,[data-tilt]{transform:none}
  .decorated-section{max-width:100%;overflow-x:clip}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .announce-inner{padding-inline:20px 44px;gap:6px;font-size:var(--fs-small)}
  .announce-tag{display:none}
}
@media(max-width:359px){
  .brand{font-size:var(--fs-ui)}
  .brand img{width:24px;height:24px}
  .lang-button svg{display:none}
  .head-inner{gap:4px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}