:root{
  color-scheme:light;
  --bg:#F4F4F7;
  --bg-top:#FAFAFC;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#ECECF2;
  --border:#DEDDE8;
  --accent:#5838D9;
  --accent-dark:#3A20A6;
  --periwinkle:#6E7CF3;
  --coral:#FFB39C;
  --orchid:#C35FC4;
  --text:#15131F;
  --text-muted:#5D5A6E;
  --ink:#15131F;
  --ink-deep:#0A0911;
  --ink-soft:#C9C6D6;
  --success:#12936A;
  --warn:#B86E0A;
  --error:#D2384A;
  --white:#FFFFFF;
  --flag-red:#D2384A;
  --flag-navy:#24307C;
  --clear:transparent;
  --w-08:rgba(255,255,255,.08);
  --w-12:rgba(255,255,255,.12);
  --w-16:rgba(255,255,255,.16);
  --w-22:rgba(255,255,255,.22);
  --w-30:rgba(255,255,255,.30);
  --w-40:rgba(255,255,255,.40);
  --w-55:rgba(255,255,255,.55);
  --w-72:rgba(255,255,255,.72);
  --w-88:rgba(255,255,255,.88);
  --a-08:rgba(88,56,217,.08);
  --a-10:rgba(88,56,217,.10);
  --a-12:rgba(88,56,217,.12);
  --a-18:rgba(88,56,217,.18);
  --a-28:rgba(88,56,217,.28);
  --a-40:rgba(88,56,217,.40);
  --a-45:rgba(88,56,217,.45);
  --p-08:rgba(110,124,243,.08);
  --ink-a24:rgba(21,19,31,.24);
  --glass-a:rgba(88,56,217,.88);
  --glass-b:rgba(110,124,243,.76);
  --glass-c:rgba(110,124,243,.66);
  --glass-deep:rgba(58,32,166,.94);
  --coral-a:rgba(255,179,156,.34);
  --coral-b:rgba(255,179,156,.55);
  --dot-1:rgba(195,95,196,.50);
  --dot-2:rgba(170,84,206,.40);
  --dot-3:rgba(88,56,217,.30);
  --dot-4:rgba(88,56,217,.20);
  --radius-s:6px;
  --radius-m:8px;
  --radius-l:10px;
  --radius-flag:3px;
  --radius-pill:999px;
  --radius-round:50%;
  --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;
  --size-xs:12px;
  --size-sm:14px;
  --size-nav:15px;
  --size-button:16px;
  --size-body:17px;
  --size-lead:18px;
  --size-brand:19px;
  --size-h3:24px;
  --size-h2:40px;
  --size-h1:64px;
  --size-h1-mobile:38px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --leading-body:1.6;
  --leading-display:1.1;
  --gutter:80px;
  --wrap-max:1440px;
  --head-height:72px;
  --anchor-gap:88px;
  --toc-offset:16px;
  --section-space:96px;
  --shadow-panel:inset 0 0 0 1px var(--border),inset 0 1px 0 var(--white),0 24px 64px -24px var(--a-10);
  --shadow-button:inset 0 1px 0 var(--w-16),0 14px 28px -14px var(--a-45);
  --ease-out:cubic-bezier(.2,.7,.2,1);
  --fast:.2s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:var(--leading-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p,h1,h2,h3,h4,ul,ol,blockquote,figure{margin:0}
ul{padding:0;list-style:none}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-heavy);text-wrap:balance}
h1{font-size:clamp(52px,4.45vw,var(--size-h1));line-height:var(--leading-display);letter-spacing:var(--tracking-display)}
h2{font-size:var(--size-h2);line-height:1.2;letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--size-h3);line-height:1.35;letter-spacing:var(--tracking-cjk)}
:lang(zh-CN) h1,:lang(zh-TW) h1{letter-spacing:var(--tracking-cjk)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--radius-s)}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head{max-width:760px;margin-bottom:40px}
.section-head p{margin-top:16px;color:var(--text-muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--bg-panel);border-radius:var(--radius-l);box-shadow:var(--shadow-panel);padding:32px}
.panel-sunken{background:var(--bg-panel-2);box-shadow:inset 0 0 0 1px var(--border)}
.muted{color:var(--text-muted)}
.inline-link,.prose a{color:var(--accent);font-weight:var(--weight-semibold);text-decoration:underline;text-decoration-color:var(--a-45);text-decoration-thickness:1.5px;text-underline-offset:4px}
.inline-link:hover,.prose a:hover{text-decoration-color:var(--accent)}
.btn,.btn-ink,.btn-primary,.btn-secondary,.login{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;text-decoration:none;border:0;border-radius:var(--radius-m);font-weight:var(--weight-semibold);transition:background-color var(--fast),color var(--fast),transform var(--fast),box-shadow var(--fast)}
.btn,.btn-ink,.btn-primary,.btn-secondary{min-height:48px;padding:0 26px;font-size:var(--size-button)}
.btn,.btn-ink,.btn-primary{background:var(--ink);color:var(--white);box-shadow:var(--shadow-button)}
.btn:hover,.btn-ink:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}
.btn-secondary:hover{color:var(--accent-dark);box-shadow:inset 0 0 0 1px var(--a-40)}
.btn:active,.btn-ink:active,.btn-primary:active,.btn-secondary:active{transform:translateY(1px)}
.btn:disabled,.btn-secondary:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;background:var(--bg-panel-2);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);transform:none}
.ghost-link{display:inline-flex;align-items:center;gap:8px;min-height:32px;font-size:var(--size-button);font-weight:var(--weight-semibold);color:var(--text);text-decoration:none}
.ghost-link:hover{color:var(--accent-dark)}
.ghost-link svg,.notice-link svg{width:16px;height:16px;display:block;transition:transform var(--fast)}
.ghost-link:hover svg,.notice-link:hover svg{transform:translateX(3px)}
.cta-row{margin-top:36px;display:flex;align-items:center;flex-wrap:wrap;gap:16px 28px}
.first{position:relative;background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 50%,var(--bg-panel-2) 100%);overflow-x:clip;max-width:100%}
.site-head,#site-header{position:relative;z-index:40}
.head-row{height:var(--head-height);display:flex;align-items:center;gap:36px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;color:var(--text);font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:var(--size-brand);letter-spacing:var(--tracking-cjk);min-height:32px}
.brand img{width:32px;height:32px;flex-shrink:0}
.brand-zh{font-weight:var(--weight-medium);color:var(--text-muted)}
.nav{display:flex;align-items:center;flex:1;min-width:0}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-link,.more-btn{position:relative;display:inline-flex;align-items:center;gap:6px;min-height:38px;padding:0 14px;border:0;background:none;border-radius:var(--radius-s);font-family:var(--font-body);font-size:var(--size-nav);font-weight:var(--weight-medium);color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color var(--fast),background-color var(--fast)}
.nav-link:hover,.more-btn:hover{color:var(--text);background:var(--a-08)}
.nav-link[aria-current="page"],.more-btn.is-current{color:var(--text);font-weight:var(--weight-semibold)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:14px;right:14px;bottom:3px;height:2px;border-radius:var(--radius-s);background:linear-gradient(90deg,var(--accent),var(--periwinkle))}
.more-btn svg,.lang svg{width:12px;height:12px;display:block}
.nav-more{position:relative}
.more-panel{position:absolute;top:calc(100% + 10px);left:0;z-index:60;min-width:280px;padding:14px;display:none;grid-template-columns:1fr 1fr;gap:4px 14px;background:var(--bg-panel);border-radius:var(--radius-l);box-shadow:inset 0 0 0 1px var(--border),0 24px 48px -16px var(--a-18)}
.nav-more.is-open .more-panel{display:grid}
.more-group p{font-family:var(--font-mono);font-size:var(--size-xs);letter-spacing:.06em;color:var(--text-muted);padding:4px 8px 6px}
.more-group a{display:flex;align-items:center;min-height:36px;padding:7px 8px;border-radius:var(--radius-s);font-size:var(--size-sm);font-weight:var(--weight-medium);color:var(--text);text-decoration:none}
.more-group a:hover,.more-group a[aria-current="page"]{background:var(--bg-panel-2);color:var(--accent-dark)}
.head-end{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:0 10px;border:0;background:none;border-radius:var(--radius-s);font-family:var(--font-body);font-size:var(--size-sm);font-weight:var(--weight-medium);color:var(--text-muted)}
.lang span{white-space:nowrap}
.lang .globe{width:16px;height:16px}
.lang:hover{color:var(--text)}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:180px;padding:8px;background:var(--bg-panel);border-radius:var(--radius-m);box-shadow:var(--shadow-panel)}
.lang-box.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--radius-s);font-size:var(--size-sm);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2);color:var(--accent-dark)}
.login{min-height:38px;padding:0 20px;background:var(--bg-panel);color:var(--text);font-size:var(--size-sm);box-shadow:inset 0 0 0 1px var(--border),inset 0 1px 0 var(--white),0 6px 16px -8px var(--a-28)}
.login:hover{color:var(--accent-dark);box-shadow:inset 0 0 0 1px var(--a-40),0 8px 20px -8px var(--a-40)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;background:var(--clear);border:1px solid var(--border);border-radius:var(--radius-s);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;transition:transform var(--fast),opacity var(--fast)}
.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)}
.mobile-drawer{display:none;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:20px var(--gutter) 32px;background:var(--bg-panel);z-index:51}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--radius-s);font-size:var(--size-button)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--bg-panel-2);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.menu-veil{display:none;position:fixed;inset:var(--head-height) 0 0;z-index:50;border:0;background:var(--ink-a24)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:56px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;max-width:340px;color:var(--text-muted);font-size:var(--size-sm)}
.footer-title{font-size:var(--size-nav);font-weight:var(--weight-semibold);margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--size-sm);color:var(--text-muted);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a[aria-current="true"]{color:var(--text);font-weight:var(--weight-semibold)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:var(--size-xs);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 24px}
.prose{min-width:0;max-width:860px;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose table{margin-top:20px;margin-bottom:20px}
.prose h2{margin-top:56px;margin-bottom:24px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:28px}
.prose li+li{margin-top:8px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere;background:var(--bg-panel-2);border-radius:var(--radius-s);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--radius-m);padding:24px}
pre code{padding:0;background:var(--clear);white-space:pre;overflow-wrap:normal}
.reveal{transition:opacity .35s var(--ease-out),transform .35s var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:32px}
#server-status+*{margin-top:32px}
@media(max-width:1279px){
  :root{--gutter:40px}
  .head-row{gap:20px}
  .nav-link,.more-btn{padding-inline:10px}
}
@media(max-width:1023px){
  :root{--gutter:28px}
  .nav{display:none}
  .head-end{margin-left:auto}
  .menu-toggle{display:flex}
  .mobile-drawer.is-open{display:block}
  .menu-veil.is-open{display:block}
  .head-row{gap:16px}
  .footer-grid{gap:32px}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--section-space:64px;--size-h2:30px}
  h1{font-size:var(--size-h1-mobile);line-height:1.15}
  .grid-three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .first,.section,.hero{max-width:100%;overflow-x:clip}
  .head-row{gap:8px}
  .head-end{margin-left:auto;gap:6px}
  .brand{font-size:var(--size-button);gap:6px}
  .brand img{width:28px;height:28px}
  .login{padding-inline:12px}
  .lang{padding-inline:6px}
  .lang span{font-size:var(--size-xs)}
  .lang .globe{display:none}
  .lang>svg:last-child{display:none}
  .panel,.card{padding:24px}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-brand{grid-column:auto}
  .footer-links{gap:4px 12px}
  .cta-row{gap:14px 20px}
}
@media(max-width:359px){
  :root{--gutter:16px}
  .brand{font-size:var(--size-sm)}
  .brand img{width:24px;height:24px}
  .head-end{gap:3px}
  .login{padding-inline:10px}
  .lang{padding-inline:3px;min-width:44px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}