:root{
  --bg:#E4EDF5;--bg-top:#EEF4FA;--bg-bottom:#DCE7F1;
  --panel:#F6F9FC;--panel2:#D7E3EE;--cream:#F4F0E2;
  --cream-lift:#F9F6EC;--cream-edge:#E2DBC5;--cream-line:#D2CCBA;
  --border:#C6D4E3;--accent:#2F7FD1;--accent-dark:#1F5FA8;--accent-lift:#5FA3E6;
  --accent-soft:rgba(47,127,209,.14);--accent-line:rgba(47,127,209,.5);
  --text:#152231;--slate:#3E5573;--prompt-ink:#3A4A60;--muted:#56657A;
  --success:#3E9B5C;--success-halo:rgba(62,155,92,.2);
  --warn:#C98A1B;--error:#C8443A;--ink:#14243A;--sprout:#8DBB3A;
  --white:#FFFFFF;--hi:rgba(255,255,255,.92);--ring:rgba(255,255,255,.74);
  --veil:rgba(255,255,255,.58);--veil-soft:rgba(255,255,255,.38);
  --top-glow:rgba(255,255,255,.62);--on-accent:#FFFFFF;
  --on-accent-veil:rgba(255,255,255,.18);--on-accent-edge:rgba(255,255,255,.34);
  --on-dark-hi:rgba(255,255,255,.14);
  --sky-spot:rgba(63,166,224,.09);--mist-spot:rgba(140,111,214,.07);
  --sky-soft:#CFE6F7;--mist-soft:#E3DDF5;--sky-wash:#E2EEF9;--mist-wash:#ECE8F7;
  --shadow-accent:rgba(47,127,209,.12);--shadow-accent-strong:rgba(31,95,168,.2);
  --shadow-cta:rgba(47,127,209,.42);--shadow-ink:rgba(20,36,58,.38);
  --flag-red:#D0333F;--flag-navy:#203E7C;--flag-green:#2B8A55;
  --flag-white:#FFFFFF;--flag-edge:rgba(21,34,49,.16);
  --clear:transparent;--scrim:rgba(20,36,58,.22);
  --r-xs:6px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-box:14px;
  --r-canvas:28px;--r-mobile:20px;--r-tile:7px;--r-pill:999px;--r-circle:50%;
  --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;
  --weight-normal:400;--weight-medium:500;--weight-strong:600;
  --gutter:24px;--wrap-width:1200px;--reading-width:820px;
  --header-height:72px;--anchor-offset:88px;--toc-offset:152px;
  --panel-shadow:inset 0 1px 0 var(--hi),0 24px 56px -24px var(--shadow-accent);
  --duration:.18s;--ease:cubic-bezier(.2,.65,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
p{margin:0 0 1.25em}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-normal);margin:0 0 .6em;overflow-wrap:break-word;text-wrap:balance}
h1{font-size:clamp(52px,5vw,68px);line-height:1.1;letter-spacing:-.02em}
h2{font-size:clamp(30px,3.4vw,44px);line-height:1.2;letter-spacing:-.02em}
h3{font-size:24px;line-height:1.35}
strong,b{font-weight:var(--weight-strong)}
ul,ol{padding-left:1.5em}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
::selection{background:var(--sky-soft);color:var(--text)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--ink);color:var(--panel);border-radius:var(--r-lg)}
pre code{white-space:pre;overflow-wrap:normal}
table{border-collapse:collapse}
th{text-align:left;font-weight:var(--weight-strong)}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{margin-bottom:32px;max-width:840px}
.section-head p{color:var(--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))}
.flow>*+*{margin-top:24px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;vertical-align:middle}
.panel,.card{background:var(--panel);border:1px solid var(--ring);border-radius:var(--r-lg);box-shadow:var(--panel-shadow);min-width:0;padding:24px}
.panel--sunken{background:var(--panel2)}
.button-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.btn,.cta-plan,.cta-go,.login{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;font-weight:var(--weight-medium);min-height:44px;border-radius:var(--r-md);font-size:15px;transition:transform var(--duration) var(--ease),box-shadow var(--duration) var(--ease),background-color var(--duration) var(--ease)}
.btn{padding:10px 20px;border:1px solid var(--border);background:var(--panel);color:var(--text);box-shadow:inset 0 1px 0 var(--hi)}
.btn-primary,.cta-go{background:linear-gradient(135deg,var(--accent-lift),var(--accent) 45%,var(--accent-dark));border-color:var(--accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--on-accent-edge),0 12px 26px -10px var(--shadow-cta)}
.btn-secondary,.cta-plan{background:var(--panel);color:var(--text);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hi)}
.btn-quiet{background:var(--clear);box-shadow:none}
.btn:hover,.cta-plan:hover,.cta-go:hover{transform:translateY(-1px)}
.btn:active,.btn.is-active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}
.btn.is-hover{box-shadow:inset 0 1px 0 var(--on-accent-edge),0 16px 30px -10px var(--shadow-cta)}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.text-link{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px;min-height:24px;display:inline-block}
.badge,.tag{display:inline-flex;align-items:center;gap:6px;max-width:100%;padding:4px 10px;border-radius:var(--r-xs);font-size:13px;line-height:1.5;background:var(--panel2);color:var(--text);overflow-wrap:anywhere}
.badge--blue{background:var(--accent-soft);color:var(--accent-dark)}
.badge--success{background:var(--success-halo);color:var(--text)}
.badge--warn{border:1px solid var(--warn)}
.badge--error{border:1px solid var(--error)}
.dot{display:inline-block;width:8px;height:8px;border-radius:var(--r-circle);background:var(--success);flex-shrink:0}
.reveal{transition:opacity .35s var(--ease),transform .35s var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:16px;min-height:120px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0}
#server-status+*{margin-top:24px}
.decorated{position:relative;overflow-x:clip}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.5em}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.prose img{border-radius:var(--r-lg)}
.topbar{position:relative;z-index:70;display:flex;align-items:center;flex-wrap:nowrap;gap:36px;height:var(--header-height);padding:0 48px;max-width:100%;background:var(--bg)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:32px}
.brand-mark{width:32px;height:32px;filter:drop-shadow(0 4px 10px var(--shadow-accent-strong))}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-strong);font-size:18px;letter-spacing:-.01em;color:var(--text)}
.brand-zh{font-size:15px;font-weight:var(--weight-normal);color:var(--muted)}
.desktop-nav{flex:1;min-width:0}
.navflat{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.navflat>li{min-width:0}
.navflat a,.more>.more-toggle{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:0 12px;border-radius:var(--r-sm);font-size:15px;color:var(--muted);cursor:pointer;white-space:nowrap}
.navflat a:hover,.more>.more-toggle:hover{color:var(--text);background:var(--veil)}
.navflat a[aria-current="page"],.more.is-current>.more-toggle{color:var(--text);background:var(--veil);box-shadow:inset 0 0 0 1px var(--ring)}
.more{position:relative}
.more>.more-toggle{border:0;background:var(--clear)}
.more>.more-toggle svg{width:14px;height:14px}
.more.is-open>.more-toggle{background:var(--veil)}
.more.is-open>.more-toggle svg{transform:rotate(180deg)}
.more-menu{position:absolute;top:calc(100% + 8px);left:0;z-index:80;min-width:212px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--panel-shadow)}
.more-menu a{display:flex;min-height:38px;padding:8px 12px;font-size:14.5px}
.more-menu a:hover{background:var(--sky-wash)}
.topbar-end{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:0 12px;border:0;border-radius:var(--r-sm);background:var(--clear);color:var(--muted);font-size:14.5px;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--veil)}
.lang svg{width:16px;height:16px}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:170px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--panel-shadow)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:14px}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--panel2)}
.login{min-height:38px;padding:0 20px;border:0;background:var(--ink);color:var(--panel);font-size:14.5px;box-shadow:inset 0 1px 0 var(--on-dark-hi),0 10px 22px -12px var(--shadow-ink)}
.login:hover{transform:translateY(-1px)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) 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(-6px) rotate(-45deg)}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:60;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--panel2);color:var(--text)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.drawer-label{display:block;padding:8px 12px;color:var(--muted);font-size:13px}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:50;background:var(--scrim);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:28px;background:var(--panel2);border-top:1px solid var(--ring);box-shadow:inset 0 1px 0 var(--hi)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:20px;color:var(--muted);font-size:14px}
.footer-title{font-size:15px;font-weight:var(--weight-strong);margin-bottom:14px}
.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:14px;color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;padding-top:32px;margin-top:32px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:16px;color:var(--muted);font-size:13px;align-items:center}
.footer-legal{display:flex;gap:20px}
@media(max-width:1180px){.topbar{gap:20px;padding-inline:24px}.navflat a,.more>.more-toggle{padding-inline:9px;font-size:14px}}
@media(max-width:1060px){.desktop-nav{display:none}.menu-toggle{display:flex}.topbar-end{margin-left:auto}.topbar{gap:12px}.footer-grid{gap:24px}}
@media(min-width:1061px){.mobile-drawer,.menu-veil{display:none!important}}
@media(max-width:768px){
  :root{--header-height:64px;--anchor-offset:80px;--toc-offset:144px;--gutter:20px}
  h1{font-size:36px;line-height:1.15}
  h2{font-size:32px}h3{font-size:22px}
  .topbar{padding-inline:16px}.brand-zh{font-size:14px}
  .grid--three{grid-template-columns:1fr}.grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section{padding-top:48px;padding-bottom:48px}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.tilt-decoration,[data-tilt]{transform:none}
  .decorated{max-width:100%}
  .topbar{gap:8px;padding-inline:12px}
  .brand{gap:6px}.brand-mark{width:28px;height:28px}.brand-en{font-size:15px}.brand-zh{font-size:12px}
  .topbar-end{gap:4px;margin-left:auto}
  .login{padding-inline:12px;font-size:13px}
  .lang{padding-inline:8px;min-width:36px}
  .lang span{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .panel,.card{padding:20px}
}
@media(max-width:359px){.brand-zh{display:none}.brand-en{font-size:14px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}