:root{
  --bg:#E9E8F5;--bg-panel:#F7F6FC;--bg-panel-2:#DDDCEE;--border:#CBC9E0;
  --accent:#1F3D35;--accent-dark:#12251F;--accent-soft:#3D7363;
  --text:#171A2B;--text-muted:#5B5E78;--success:#1E9A63;--warn:#D9941A;--error:#C23A4E;
  --stage-top:#F3F2FB;--stage-bottom:#E3E2F2;
  --honey:#F4BC33;--honey-glow:rgba(244,188,51,.34);--honey-hl:rgba(255,255,255,.42);
  --violet:#8C6BE8;--rose:#D06AA8;--violet-soft:#B8A5F4;--violet-wash:rgba(140,107,232,.16);--rose-glow:rgba(208,106,168,.6);
  --link-slate:#6A7390;
  --dk-0:#141A26;--dk-1:#1B2231;--dk-2:#242C3E;--dk-line:#2A3245;--dk-text:#E8EAF4;--dk-muted:#8D94AC;--dk-faint:#646C85;
  --success-soft:#62C99A;--success-wash:rgba(30,154,99,.18);--success-ring:rgba(30,154,99,.22);
  --hl-5:rgba(255,255,255,.05);--hl-8:rgba(255,255,255,.08);--hl-14:rgba(255,255,255,.14);--hl-90:rgba(255,255,255,.9);
  --panel-60:rgba(247,246,252,.6);--glass:rgba(247,246,252,.88);--glass-edge:rgba(255,255,255,.72);
  --line-soft:rgba(203,201,224,.8);--accent-28:rgba(31,61,53,.28);--accent-07:rgba(31,61,53,.07);--accent-shadow:rgba(18,37,31,.38);
  --sh-violet-10:rgba(76,62,156,.10);--sh-violet-12:rgba(76,62,156,.12);--sh-violet-22:rgba(52,42,120,.22);--sh-ink:rgba(20,26,38,.18);
  --flag-red:#D33340;--flag-white:#FFFFFF;--flag-blue:#2E3E85;--flag-green:#1F8A4D;--flag-gold:#F1C232;--flag-black:#1E1E24;--flag-edge:rgba(23,26,43,.16);
  --clear:transparent;--veil:rgba(20,26,38,.42);
  --r-xs:5px;--r-sm:7px;--r-md:10px;--r-lg:14px;--r-control:9px;--r-glass:12px;--r-badge-mobile:18px;--r-pill:999px;--r-round:50%;--r-flag:3px;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --size-body:16px;--size-h1:68px;--size-h2:38px;--size-h3:24px;--size-small:14px;
  --weight-regular:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;--weight-display:900;
  --gutter:24px;--page-width:1228px;--reading-width:820px;--head-height:60px;--anchor-offset:80px;--toc-offset:144px;
  --space-section:96px;--space-card:24px;--ease:cubic-bezier(.2,.7,.3,1);--fast:150ms;--reveal-time:350ms;
  --panel-shadow:inset 0 1px 0 var(--hl-90),0 24px 56px -28px var(--sh-violet-10);
}
*,*::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(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
[hidden]{display:none!important}
img,svg{vertical-align:middle;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
a,button,summary{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent-soft);outline-offset:3px}
:where(.window a,.window button):focus-visible{outline-color:var(--success-soft)}
p,ul,ol,blockquote,figure{margin:0}
ul{padding:0;list-style:none}
ol{padding-left:1.5em}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--accent);text-wrap:balance}
h1{font-size:clamp(52px,5vw,var(--size-h1));font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:clamp(28px,3vw,var(--size-h2));font-weight:var(--weight-heavy);line-height:1.3;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--size-h3);font-weight:var(--weight-bold);line-height:1.4;margin:0 0 16px}
h4{font-size:var(--size-body);margin:0 0 12px}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{overflow-x:auto;max-width:100%;padding:20px;background:var(--dk-0);color:var(--dk-text);border-radius:var(--r-md)}
pre code{white-space:pre;overflow-wrap:normal}
:where(main,article,section,div,li,nav,aside){min-width:0}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-heading{margin-bottom:40px;max-width:820px}
.section-heading p{color:var(--text-muted);font-size:18px}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.prose{line-height:1.85;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose blockquote,.prose pre{margin-block:20px}
.prose ul{list-style:disc;padding-left:1.5em}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.prose code{background:var(--bg-panel-2);padding:2px 5px;border-radius:var(--r-xs)}
.prose pre code{padding:0;background:var(--clear)}
.surface{background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--panel-shadow);padding:var(--space-card)}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-five{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-block:32px}
#server-status+*{margin-top:32px}
.stage{background:linear-gradient(180deg,var(--stage-top) 0%,var(--stage-top) 6%,var(--stage-bottom) 100%);overflow-x:clip;max-width:100%;padding-bottom:18px}
.decorated-section{overflow-x:clip;position:relative;max-width:100%}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico{fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.f-red{fill:var(--flag-red)}.f-white{fill:var(--flag-white)}.f-blue{fill:var(--flag-blue)}.f-green{fill:var(--flag-green)}.f-gold{fill:var(--flag-gold)}.f-black{fill:var(--flag-black)}
.f-edge{fill:none;stroke:var(--flag-edge);stroke-width:1}
#site-header{position:sticky;top:0;z-index:80;background:var(--stage-top);min-height:var(--head-height)}
.site-head{height:var(--head-height);display:flex;align-items:center;gap:32px;position:relative}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand img{display:block;width:30px;height:30px}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:17px;letter-spacing:-.01em;color:var(--accent)}
.brand-zh{font-size:13.5px;font-weight:var(--weight-medium);color:var(--text-muted)}
.nav-main{display:flex;align-items:center;gap:2px;flex:1;min-width:0}
.nav-main>ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-link{display:inline-flex;align-items:center;gap:5px;min-height:36px;padding:0 12px;border:0;background:var(--clear);cursor:pointer;border-radius:var(--r-sm);font-size:14.5px;font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap;transition:color var(--fast),background-color var(--fast)}
.nav-link:hover,.nav-link:focus-visible{color:var(--text);background:var(--accent-07)}
.nav-link[aria-current="page"]{color:var(--accent);font-weight:var(--weight-semibold)}
.nav-more{position:relative}
.nav-more>summary{list-style:none}
.nav-more>summary::-webkit-details-marker{display:none}
.more-menu{position:absolute;top:calc(100% + 6px);left:-8px;z-index:90;display:none;grid-template-columns:repeat(2,minmax(150px,1fr));gap:4px 18px;padding:14px 16px;background:var(--bg-panel);border:1px solid var(--line-soft);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hl-90),0 22px 44px -18px var(--sh-violet-22)}
.nav-more.is-open>.more-menu,.nav-more[open]>.more-menu{display:grid}
.more-group{display:flex;flex-direction:column;gap:2px}
.more-cap{font-size:11.5px;font-weight:var(--weight-semibold);letter-spacing:.06em;color:var(--text-muted);padding:2px 8px 6px}
.more-group a{display:flex;align-items:center;min-height:36px;padding:7px 8px;border-radius:var(--r-sm);font-size:14px;color:var(--text)}
.more-group a:hover,.more-group a:focus-visible{background:var(--accent-07);color:var(--accent)}
.head-tools{display:flex;align-items:center;gap:8px;flex-shrink:0;margin-left:auto}
.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 10px;border:0;background:var(--clear);cursor:pointer;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted)}
.lang span{white-space:nowrap}
.lang:hover{background:var(--accent-07);color:var(--text)}
.lang-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);z-index:100;min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--panel-shadow)}
.lang-picker.is-open .lang-menu{display:block}
.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]{background:var(--accent-07);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 18px;border-radius:var(--r-control);background:var(--accent);color:var(--bg-panel);font-size:14px;font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-14),0 6px 14px -8px var(--accent-shadow);transition:background-color var(--fast)}
.login:hover{background:var(--accent-dark)}
.burger{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;background:var(--clear);border:1px solid var(--border);border-radius:var(--r-sm)}
.burger-line{display:block;width:20px;height:2px;background:currentColor}
.drawer{display:none}
.nav-veil{display:none}
.hero{padding-top:22px;text-align:center}
.hero-copy{position:relative;z-index:2}
.pill{display:inline-flex;align-items:center;gap:8px;min-height:30px;padding:3px 16px;border-radius:var(--r-pill);background:var(--honey);color:var(--accent-dark);font-size:13.5px;font-weight:var(--weight-semibold);letter-spacing:.01em;box-shadow:inset 0 1px 0 var(--honey-hl),0 8px 18px -10px var(--honey-glow)}
.pill .arr{font-weight:var(--weight-bold)}
.hero h1{margin:14px 0 0;font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--size-h1);line-height:1.08;letter-spacing:-.03em;color:var(--accent)}
.h1-line{display:block}
.lede{margin:12px auto 0;max-width:860px;font-size:20px;line-height:1.4;color:var(--text-muted)}
.lede strong{color:var(--accent);font-weight:var(--weight-bold)}
.cta-row{margin-top:20px;display:flex;justify-content:center;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 26px;border:1px solid var(--clear);border-radius:var(--r-md);font-size:15.5px;font-weight:var(--weight-semibold);letter-spacing:.01em;flex-shrink:0;white-space:nowrap;transition:transform var(--fast),opacity var(--fast),background-color var(--fast)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:linear-gradient(180deg,var(--accent) 0%,var(--accent-dark) 100%);color:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hl-14),0 12px 24px -12px var(--accent-shadow)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost,.btn-secondary{background:var(--panel-60);color:var(--accent);border:1px solid var(--accent-28)}
.btn:active,.btn.is-active{transform:none;background:var(--accent-dark);color:var(--bg-panel)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;transform:none;pointer-events:none}
.trust{margin-top:12px;display:flex;justify-content:center;flex-wrap:wrap;font-size:14px;line-height:20px;color:var(--text-muted)}
.trust li{display:inline-flex;align-items:center;gap:6px}
.trust li+li::before{content:"·";margin:0 12px 0 6px;color:var(--border)}
.trust svg{display:block;color:var(--accent)}
.badges{margin-top:12px;display:flex;justify-content:center;gap:12px}
.badge-cap{display:inline-flex;align-items:center;gap:14px;min-height:34px;padding:4px 16px 4px 14px;border-radius:var(--r-pill);background:var(--bg-panel);border:1px solid var(--line-soft);box-shadow:inset 0 1px 0 var(--hl-90),0 6px 16px -10px var(--sh-violet-22)}
.cap-label{font-size:11.5px;font-weight:var(--weight-semibold);letter-spacing:.06em;color:var(--text-muted);padding-right:12px;border-right:1px solid var(--border);line-height:16px}
.plat,.flag-item{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:var(--weight-medium);color:var(--text);white-space:nowrap}
.plat svg{width:16px;height:16px;display:block}
.flag-item svg{width:20px;height:14px;display:block;border-radius:var(--r-flag);overflow:hidden}
.statement{background:linear-gradient(180deg,var(--stage-bottom) 0%,var(--bg) 260px);padding-top:120px;padding-bottom:128px}
.stmt{max-width:1020px;font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:38px;line-height:1.34;letter-spacing:-.02em;color:var(--accent)}
.arrow-link{display:inline-flex;align-items:center;gap:8px;min-height:32px;margin-top:40px;font-family:var(--font-display);font-size:24px;font-weight:var(--weight-bold);letter-spacing:-.01em;color:var(--link-slate)}
.arrow-link:hover{opacity:.8}
.site-foot{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:64px;padding-bottom:24px}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.foot-brand p{color:var(--text-muted);margin-top:20px;max-width:340px}
.foot-title{font-size:14px;font-weight:var(--weight-bold);margin-bottom:16px;color:var(--accent)}
.foot-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px}
.foot-links a,.foot-languages a,.foot-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted)}
.site-foot a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.foot-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border)}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-top:24px;font-size:13px;color:var(--text-muted)}
.foot-legal{display:flex;flex-wrap:wrap;gap:16px}
@media(max-width:1100px){
  .site-head{gap:20px}
  .nav-link{padding-inline:8px;font-size:14px}
  .lang{padding-inline:6px}
}
@media(max-width:1024px){
  .badges{flex-wrap:wrap}
  .stmt{font-size:32px}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:900px){
  .site-head{gap:12px;flex-wrap:nowrap}
  .nav-main{display:none}
  .head-tools{margin-left:auto;gap:6px;position:relative;z-index:85}
  .burger{display:flex}
  .lang span{display:none}
  .drawer{position:fixed;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;padding:16px var(--gutter) 32px;background:var(--bg-panel);z-index:70}
  .drawer.is-open{display:block}
  .drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm)}
  .drawer a:hover,.drawer a[aria-current]{color:var(--accent);background:var(--accent-07)}
  .drawer-caption{display:block;padding:20px 16px 8px;font-size:13px;color:var(--text-muted);border-top:1px solid var(--border);margin-top:16px}
  .nav-veil{position:fixed;inset:var(--head-height) 0 0;background:var(--veil);z-index:60;border:0;width:100%}
  .nav-veil.is-open{display:block}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1/-1}
}
@media(max-width:768px){
  h1,.hero h1{font-size:38px;line-height:1.14;letter-spacing:-.02em}
  .grid-three{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px;--space-section:64px;--space-card:20px}
  .no-break{white-space:normal}
  .brand-zh{display:none}
  .brand{gap:7px}
  .brand-en{font-size:16px}
  .brand img{width:28px;height:28px}
  .site-head{gap:6px}
  .login{padding-inline:12px}
  .lang{padding-inline:4px}
  .lede{font-size:16px}
  .cta-row{flex-wrap:wrap}
  .cta-row .btn{flex:1 1 140px}
  .trust{font-size:13px;row-gap:4px}
  .badges{flex-direction:column;align-items:stretch}
  .badge-cap{height:auto;flex-wrap:wrap;justify-content:center;gap:8px 12px;padding:10px 14px;border-radius:var(--r-badge-mobile)}
  .cap-label{flex-basis:100%;text-align:center;border-right:0;padding-right:0}
  .statement{padding-top:72px;padding-bottom:72px}
  .stmt{font-size:28px}
  .arrow-link{font-size:20px;margin-top:24px}
  .grid-five{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr;gap:32px}
  .foot-brand{grid-column:auto}
  .tilt,[data-tilt]{transform:none!important}
  .decorated-section>*{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}