:root{
  --bg:#EAEDF9;
  --bg-top:#F3F5FD;
  --bg-bottom:#E2E6F6;
  --panel:#F8F9FE;
  --panel-2:#DDE2F4;
  --white:#FFFFFF;
  --border:#C9D0EA;
  --line:rgba(201,208,234,.78);
  --accent:#C8338F;
  --accent-dark:#93216A;
  --orange:#F08A3C;
  --violet:#6B4BE6;
  --blue:#2F6BEA;
  --text:#171A33;
  --ink:#171A33;
  --muted:#5A6080;
  --faint:#8A90AE;
  --success:#1F9D6B;
  --warn:#D98A1A;
  --error:#D43C3C;
  --flag-red:#D7263D;
  --flag-navy:#1E3A8A;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(23,26,51,.14);
  --glass-12:rgba(255,255,255,.12);
  --glass-18:rgba(255,255,255,.18);
  --glass-24:rgba(255,255,255,.24);
  --glass-35:rgba(255,255,255,.35);
  --glass-70:rgba(255,255,255,.7);
  --glass-85:rgba(255,255,255,.85);
  --tint-accent:rgba(200,51,143,.10);
  --tint-violet:rgba(107,75,230,.11);
  --tint-blue:rgba(47,107,234,.10);
  --tint-success:rgba(31,157,107,.16);
  --shadow-berry:rgba(200,51,143,.10);
  --shadow-cta:rgba(200,51,143,.14);
  --shadow-violet:rgba(107,75,230,.22);
  --shadow-ink:rgba(23,26,51,.26);
  --shadow-xs:rgba(23,26,51,.06);
  --veil-color:rgba(23,26,51,.38);
  --mask-on:#000000;
  --clear:transparent;
  --grad-notice:linear-gradient(90deg,var(--orange) 0%,var(--accent) 50%,var(--violet) 100%);
  --grad-rail:linear-gradient(180deg,var(--accent) 0%,var(--violet) 100%);
  --grad-plan:linear-gradient(150deg,var(--accent) 0%,var(--violet) 100%);
  --grad-switch:linear-gradient(90deg,var(--accent),var(--violet));
  --grad-first:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 58%,var(--bg-bottom) 100%);
  --lift:0 0 0 1px var(--line),inset 0 1px 0 var(--white),0 24px 48px var(--shadow-berry),0 4px 12px var(--shadow-xs);
  --lift-sm:0 0 0 1px var(--line),inset 0 1px 0 var(--white),0 14px 28px -8px var(--shadow-berry),0 2px 6px var(--shadow-xs);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xl:24px;
  --r-lg:20px;
  --r-md:14px;
  --r-sm:10px;
  --r-xs:6px;
  --r-device:28px;
  --r-pill:999px;
  --gutter:24px;
  --content-width:1248px;
  --head-height:64px;
  --anchor-offset:88px;
  --toc-offset:84px;
  --toc-landing:156px;
  --text-base:16px;
  --text-small:14px;
  --text-micro:12px;
  --weight-body:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --weight-display:900;
  --ease:150ms ease;
  --reveal-time:350ms;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-body);color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--tint-accent)}
button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
ul{list-style:none}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,68px);line-height:1.1;font-weight:var(--weight-display);letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);line-height:1.2;font-weight:var(--weight-heavy);letter-spacing:-.02em}
h3{font-size:24px;line-height:1.3;font-weight:var(--weight-heavy)}
h4{font-size:18px;font-weight:var(--weight-bold)}
p{overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{word-break:keep-all}
input,select,textarea{max-width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--white)}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:64px;padding-bottom:64px}
.stack>*+*{margin-top:20px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*,:where(.head-in,.head-tools,.cta-row,.promo-block,.feature-row)>*{min-width:0}
.no-break{white-space:nowrap}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.panel,.card{padding:24px;border-radius:var(--r-xl);background:var(--panel);box-shadow:var(--lift-sm);min-width:0}
.panel-inset{padding:24px;border-radius:var(--r-lg);background:var(--panel-2)}
.reading-wrap{max-width:880px;margin-inline:auto}
.prose{min-width:0}
.prose p,.prose ul,.prose ol,.prose pre,.prose table,.prose blockquote{margin-block:20px}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose li+li{margin-top:8px}
.prose a,.text-link{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.btn,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;padding:10px 22px;border-radius:var(--r-pill);font-weight:var(--weight-bold);font-size:var(--text-small);flex-shrink:0;white-space:nowrap;border:1px solid var(--clear);transition:background-color var(--ease),transform var(--ease)}
.btn,.btn-primary{background:var(--ink);color:var(--white);box-shadow:0 10px 24px var(--shadow-cta)}
.prose a.btn,.prose a.btn-primary{color:var(--white);text-decoration:none}
.btn:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn-secondary{color:var(--text);background:var(--white);border-color:var(--border)}
.btn-secondary:hover{background:var(--panel-2)}
.btn-accent{background:var(--accent);color:var(--white)}
.btn-accent:hover{background:var(--accent-dark)}
.btn-main{display:inline-flex;align-items:center;justify-content:center;gap:14px;height:52px;padding:0 8px 0 26px;border-radius:var(--r-pill);background:var(--ink);color:var(--white);font-size:17px;font-weight:var(--weight-bold);box-shadow:inset 0 1px 0 var(--glass-18),0 0 0 1px var(--ink),0 14px 32px var(--shadow-cta),0 4px 10px var(--shadow-xs);transition:transform var(--ease);flex-shrink:0;white-space:nowrap}
.btn-main:hover,.btn-ghost:hover{transform:translateY(-1px)}
.btn-main-ico{width:36px;height:36px;border-radius:var(--r-pill);background:var(--white);color:var(--ink);display:grid;place-items:center;flex-shrink:0}
.btn-main-ico svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.btn-ghost{display:inline-flex;align-items:center;justify-content:center;height:52px;padding:0 30px;border-radius:var(--r-pill);border:1.5px solid var(--clear);background:linear-gradient(var(--white),var(--white)) padding-box,var(--grad-notice) border-box;color:var(--text);font-size:17px;font-weight:var(--weight-bold);box-shadow:0 10px 24px var(--shadow-berry);transition:transform var(--ease);flex-shrink:0;white-space:nowrap}
.cta-row{margin-top:24px;display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}
.notice{position:relative;background:var(--grad-notice);color:var(--white)}
.notice-in{min-height:40px;display:flex;align-items:center;justify-content:center;gap:10px;font-size:var(--text-small);font-weight:var(--weight-medium);padding:0 120px}
.notice-in a{font-weight:var(--weight-bold);text-decoration:underline;text-underline-offset:3px}
.notice-dot{width:4px;height:4px;border-radius:var(--r-pill);background:var(--glass-70);flex-shrink:0}
.notice-ctl{position:absolute;right:24px;top:50%;transform:translateY(-50%);display:flex;align-items:center;gap:8px}
.notice-ctl button{width:26px;height:26px;border-radius:var(--r-pill);display:grid;place-items:center;background:var(--glass-18);box-shadow:inset 0 0 0 1px var(--glass-24)}
.notice-ctl .notice-x{background:none;box-shadow:none;margin-left:10px}
.notice-ctl svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.first{position:relative;background:var(--grad-first);overflow-x:clip;max-width:100%}
.site-head{position:relative;z-index:60}
.head-in{height:var(--head-height);display:flex;align-items:center;gap:28px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:20px;letter-spacing:-.02em;color:var(--text);flex-shrink:0}
.brand-mark{width:32px;height:32px}
.brand-zh{font-weight:var(--weight-medium);color:var(--muted)}
.nav{flex:1;min-width:0;display:flex;justify-content:center}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-item{position:relative}
.nav-link{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:40px;padding:0 14px;border-radius:var(--r-pill);font-size:15px;font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:color var(--ease),background-color var(--ease)}
.nav-link:hover,.nav-link:focus-visible{color:var(--text);background:var(--glass-70)}
.nav-link[aria-current="page"],.nav-link.is-current{color:var(--text);font-weight:var(--weight-semibold);background:var(--white);box-shadow:0 0 0 1px var(--line),0 4px 12px var(--shadow-xs)}
.nav-link svg{width:12px;height:12px;fill:none;stroke:currentColor;stroke-width:2.2}
.nav-more{position:relative}
.nav-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);width:260px;padding:8px;border-radius:var(--r-md);background:var(--panel);box-shadow:var(--lift);z-index:65}
.nav-menu a{display:block;padding:10px 12px;border-radius:var(--r-sm)}
.nav-menu a:hover,.nav-menu a:focus-visible{background:var(--white)}
.nav-menu b{display:block;font-size:var(--text-small);font-weight:var(--weight-semibold)}
.nav-menu span{display:block;font-size:var(--text-micro);color:var(--muted);line-height:1.5}
.nav-more-static{position:relative}
.nav-more-static>summary{list-style:none}
.nav-more-static>summary::-webkit-details-marker{display:none}
.head-tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;min-width:44px;width:auto;padding:0 12px;border-radius:var(--r-pill);font-size:var(--text-small);font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--glass-70);color:var(--text)}
.lang svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);min-width:180px;padding:8px;border-radius:var(--r-md);background:var(--panel);box-shadow:var(--lift);z-index:80}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--text-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 22px;border-radius:var(--r-pill);background:var(--accent);color:var(--white);font-size:15px;font-weight:var(--weight-bold);box-shadow:inset 0 1px 0 var(--glass-24),0 8px 20px -6px var(--shadow-cta);white-space:nowrap;transition:background-color var(--ease)}
.login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border-radius:var(--r-sm);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.nav-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{position:relative;background:var(--panel-2);border-top:1px solid var(--border);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-about p{margin-top:16px;max-width:34em;color:var(--muted);font-size:var(--text-small)}
.footer-title{font-size:15px;font-weight:var(--weight-bold);margin-bottom:12px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a{display:flex;align-items:center;min-height:32px;font-size:var(--text-small);color:var(--muted)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;gap:8px 20px;flex-wrap:wrap;padding-top:28px}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-small)}
.footer-bottom{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--border);padding-top:20px;margin-top:20px;font-size:var(--text-micro);color:var(--muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.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{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(min-width:1001px) and (max-width:1200px){
  .head-in{gap:16px}
  .nav-link{padding-inline:10px}
  .head-tools{gap:6px}
}
@media(max-width:1000px){
  .head-in{gap:12px}
  .nav{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:flex}
  .nav-drawer{display:block;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;padding:20px var(--gutter) 40px;background:var(--panel);z-index:55}
  .nav-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm);color:var(--text)}
  .nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--panel-2);color:var(--accent-dark)}
  .drawer-languages{border-top:1px solid var(--border);padding-top:16px;margin-top:16px}
  .nav-veil{display:block;position:fixed;inset:var(--head-height) 0 0;background:var(--veil-color);z-index:50}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .notice-in{padding:8px 46px 8px 16px;min-height:40px;gap:6px;flex-wrap:wrap;font-size:var(--text-micro)}
  .notice-ctl{right:12px}
  .notice-ctl button:not(.notice-x){display:none}
  .notice-ctl .notice-x{margin-left:0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-about{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .sec{padding-top:40px;padding-bottom:40px}
  .grid{grid-template-columns:minmax(0,1fr)}
  .head-in{gap:6px}
  .brand{gap:6px;font-size:17px}
  .brand-mark{width:28px;height:28px}
  .head-tools{gap:3px;margin-left:auto}
  .login{padding-inline:14px;font-size:var(--text-small)}
  .lang{padding-inline:6px;font-size:var(--text-micro);gap:4px}
  .lang svg{width:14px;height:14px}
  .panel,.card{padding:20px}
  .tilt,[data-tilt]{transform:none}
  .decoration,.stripe-halo{max-width:100%}
}
@media(max-width:374px){
  .brand{font-size:15px;gap:4px}
  .brand-mark{width:24px;height:24px}
  .lang{padding-inline:3px;font-size:11px}
  .lang svg{display:none}
  .login{padding-inline:10px}
  .head-tools{gap:0}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}