:root{
  color-scheme:light;
  --bg:#F9F8F5;
  --panel:#FFFFFF;
  --panel-2:#F1EFEA;
  --chrome:#F4F3EF;
  --border:#E6E3DC;
  --border-soft:#EEEBE5;
  --accent:#DE5B2C;
  --accent-hi:#E8693A;
  --accent-dark:#B5431C;
  --apricot:#F3A66E;
  --accent-soft:#FCE9DF;
  --text:#1C1B19;
  --muted:#6B6760;
  --faint:#9A958C;
  --success:#2E9A5E;
  --success-soft:#DDF0E5;
  --warn:#D99A1E;
  --error:#C8372D;
  --sky:#6AAEF7;
  --lake:#2C74E0;
  --sky-pale:#C6E0FC;
  --sky-mist:#9BC8F8;
  --lake-deep:#1E5DC4;
  --blue:#2F6FD6;
  --blue-soft:#E3EEFD;
  --teal:#2A9A85;
  --teal-deep:#1C6E5F;
  --teal-soft:#DDF1EB;
  --lavender:#8A76D3;
  --lavender-ink:#5B48AE;
  --lavender-soft:#EDE8FA;
  --flag-red:#D2352B;
  --flag-white:#FFFFFF;
  --flag-blue:#27408B;
  --flag-green:#1E8A4B;
  --flag-gold:#F2C230;
  --flag-black:#1C1B19;
  --ink-shadow:rgba(28,27,25,.13);
  --veil:rgba(28,27,25,.30);
  --lake-shine:rgba(255,255,255,.34);
  --leaf-vein:rgba(255,255,255,.26);
  --sky-glow:rgba(255,255,255,.38);
  --accent-wash-strong:rgba(222,91,44,.07);
  --accent-wash:rgba(222,91,44,.035);
  --accent-ring:rgba(222,91,44,.11);
  --glow:rgba(243,166,110,.30);
  --hl-color:rgba(255,255,255,.55);
  --shadow-soft:0 14px 30px -20px rgba(222,91,44,.22),0 1px 2px rgba(28,27,25,.05);
  --shadow-mark:0 6px 14px -6px rgba(222,91,44,.55);
  --shadow-cta:0 14px 26px -12px rgba(222,91,44,.55),0 2px 4px rgba(181,67,28,.18);
  --shadow-login:0 8px 18px -10px rgba(28,27,25,.45);
  --shadow-card:0 46px 90px -44px rgba(222,91,44,.30),0 20px 50px -30px rgba(44,116,224,.30);
  --shadow-window:0 44px 70px -34px rgba(222,91,44,.26),0 34px 90px -30px rgba(30,93,196,.42),0 2px 6px rgba(28,27,25,.07);
  --shadow-float:0 22px 40px -18px rgba(30,93,196,.38),0 10px 24px -16px rgba(222,91,44,.24);
  --shadow-power:0 16px 28px -10px rgba(222,91,44,.55);
  --r-xl:32px;
  --r-lg:24px;
  --r-window:20px;
  --r-md:16px;
  --r-route:12px;
  --r-sm:10px;
  --r-xs:3px;
  --r-tab:2px;
  --r-circle:50%;
  --r-pill:999px;
  --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-xs:12px;
  --fs-tag:11.5px;
  --fs-small:13px;
  --fs-ui:14px;
  --fs-nav:14.5px;
  --fs-medium:15px;
  --fs-body:16px;
  --fs-lede:18px;
  --fs-brand:19px;
  --fs-subtitle:20px;
  --fs-stat:21px;
  --fs-h3:24px;
  --fs-h2:clamp(28px,3vw,40px);
  --fs-h1:clamp(52px,5vw,64px);
  --fs-h1-mobile:36px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-ui:650;
  --weight-bold:700;
  --weight-display:800;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --tracking-ui:.01em;
  --line-body:1.6;
  --line-reading:1.85;
  --line-title:1.1;
  --gutter:32px;
  --wrap-width:1240px;
  --reading-width:800px;
  --head-height:64px;
  --anchor-space:80px;
  --toc-offset:16px;
  --toc-anchor:96px;
  --section-space:72px;
  --ease-time:.2s;
  --reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{margin:0;padding:0;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:var(--line-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,a,input,summary,select,textarea{ -webkit-tap-highlight-color:var(--accent-ring)}
:where(a,button,input,summary,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55;box-shadow:none;transform:none}
img,video{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);line-height:var(--line-title);font-weight:var(--weight-display);letter-spacing:var(--tracking-display)}
:lang(zh-CN) h1,:lang(zh-TW) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--tracking-cjk)}
h2{font-size:var(--fs-h2);line-height:1.25;font-weight:var(--weight-bold);letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--fs-h3);line-height:1.35;font-weight:var(--weight-bold)}
p{margin-bottom:20px}
ul,ol{padding-left:24px}
li+li{margin-top:6px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-md);background:var(--panel-2);border:1px solid var(--border)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin:24px 0}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
table{border-collapse:collapse}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{max-width:var(--reading-width);margin-inline:auto}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head{margin-bottom:32px;max-width:800px}
.section-head p{color:var(--muted)}
.grid{display:grid;gap:24px}
.grid>*,:where(.head-inner,.tools,.cta-row,.footer-grid,.promo-block,.win-body)>*{min-width:0}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.panel,.card{background:var(--panel);border-radius:var(--r-lg);padding:32px;box-shadow:var(--shadow-soft),inset 0 1px 0 var(--hl-color);border:1px solid var(--border-soft)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:24px;height:24px;display:inline-block;vertical-align:middle}
.ln,.tick{fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.plus{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;min-width:168px;padding:10px 26px;border:0;border-radius:var(--r-pill);font-size:var(--fs-body);font-weight:var(--weight-ui);letter-spacing:var(--tracking-ui);line-height:1.4;transition:background var(--ease-time),transform var(--ease-time);text-align:center}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(180deg,var(--accent-hi),var(--accent));color:var(--panel);box-shadow:var(--shadow-cta),inset 0 1px 0 var(--hl-color)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--panel-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--border)}
.btn-small{min-height:40px;min-width:0;padding:8px 18px;font-size:var(--fs-ui)}
.cta-row{display:flex;gap:12px;justify-content:center}
.top{position:relative;overflow-x:clip;max-width:100%;isolation:isolate}
.top::before{content:"";position:absolute;inset:0 0 auto;height:680px;background:linear-gradient(180deg,var(--accent-wash-strong) 0%,var(--accent-wash) 38%,transparent 100%);z-index:-1}
.top::after{content:"";position:absolute;inset:-220px -6% auto 54%;height:640px;border-radius:var(--r-circle);background:radial-gradient(closest-side,var(--glow),transparent);z-index:-1}
.site-head{position:relative;z-index:50;border-bottom:1px solid var(--border-soft)}
.head-inner{display:flex;align-items:center;gap:24px;height:var(--head-height);flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand-mark{width:34px;height:34px;border-radius:var(--r-sm);box-shadow:var(--shadow-mark)}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--fs-brand);letter-spacing:var(--tracking-cjk);white-space:nowrap}
.nav{flex:1;display:flex;justify-content:center;min-width:0;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav li{margin:0;flex-shrink:0}
.nav a{position:relative;display:block;padding:0 12px;line-height:63px;font-size:var(--fs-nav);font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:color var(--ease-time)}
.nav a::after{content:"";position:absolute;left:12px;right:12px;bottom:0;height:3px;border-radius:var(--r-xs) var(--r-xs) 0 0;background:var(--border);opacity:0;transition:opacity var(--ease-time)}
.nav a:hover{color:var(--text)}
.nav a:hover::after{opacity:1}
.nav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-ui)}
.nav a[aria-current="page"]::after{background:var(--accent);opacity:1}
.tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;border:0;background:transparent;border-radius:var(--r-pill);font-size:var(--fs-ui);font-weight:var(--weight-medium);color:var(--muted);cursor:pointer}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang svg{width:16px;height:16px}
.lang-panel{position:absolute;z-index:80;right:0;top:calc(100% + 12px);min-width:184px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-ui);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 20px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-ui);font-weight:var(--weight-ui);box-shadow:var(--shadow-login);white-space:nowrap}
.login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;min-width:44px;min-height:44px;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-tab)}
.mobile-drawer{position:fixed;z-index:45;top:var(--head-height);left:0;right:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.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:48px;padding:12px 16px;border-radius:var(--r-sm);font-weight:var(--weight-medium)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-dark)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.drawer-languages a[aria-current="true"]{background:var(--panel-2)}
.menu-veil{position:fixed;z-index:40;inset:var(--head-height) 0 0;border:0;background:var(--veil)}
html.nav-open{overflow:hidden}
.site-footer{margin-top:40px;padding-top:56px;padding-bottom:28px;border-top:1px solid var(--border);background:linear-gradient(180deg,var(--accent-wash),transparent),var(--panel-2)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{margin-top:20px;color:var(--muted);max-width:360px;font-size:var(--fs-ui)}
.footer-title{font-size:var(--fs-body);font-weight:var(--weight-bold);margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px;list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-ui);color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-small)}
.footer-languages a[aria-current="true"]{color:var(--accent-dark);font-weight:var(--weight-bold)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:var(--fs-small);color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;gap:20px}
.prose{line-height:var(--line-reading);overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li{margin-bottom:8px}
.prose img{border-radius:var(--r-md)}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-height:120px;overflow:hidden;max-width:100%;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
@media(max-width:1180px){
  .head-inner{gap:16px}
  .nav a{padding:0 9px;font-size:var(--fs-ui)}
  .nav a::after{left:9px;right:9px}
  .lang{padding-inline:8px}
}
@media(max-width:1000px){
  .lang span{display:none}
}
@media(max-width:900px){
  .nav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:flex}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(min-width:901px){
  .mobile-drawer,.menu-veil{display:none!important}
}
@media(max-width:768px){
  h1{font-size:var(--fs-h1-mobile);line-height:1.2}
  .grid-three{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:18px;--section-space:48px}
  .wrap{padding-inline:var(--gutter)}
  .no-break{white-space:normal}
  .grid-two{grid-template-columns:1fr}
  .panel,.card{padding:24px}
  .cta-row{flex-wrap:wrap}
  .cta-row .btn{min-width:0;flex:1 1 140px}
  .tools{gap:4px;margin-left:auto}
  .head-inner{gap:8px}
  .brand{gap:7px}
  .brand-en{font-size:var(--fs-body)}
  .brand-mark{width:30px;height:30px}
  .login{padding-inline:14px}
  .lang{padding-inline:6px}
  .lang span{display:none}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .tilt,[data-tilt]{transform:none}
  .top,.top::before,.top::after{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}