:root{
  color-scheme:light;
  --bg:#FCFAF6;--bg-top:#FDFBF8;--bg-bottom:#F8F3EC;
  --panel:#FFFFFF;--panel2:#F5EEE6;--panel-warm:#FBF6F0;--side:#F7F4EF;
  --border:#E9E2D8;--border-soft:#F1ECE4;--border-strong:#DCD3C7;
  --accent:#EF7148;--accent-hi:#F4865F;--accent-dark:#C9532E;
  --text:#2E3135;--muted:#6B6F76;
  --success:#2F9E5B;--success-bg:#E5F3EA;
  --link:#5A5FCF;--link-bg:#ECEDFA;--warn:#D99A1E;--error:#D6453A;
  --doodle:#E6D6C4;--apricot:rgba(247,178,132,.42);--apricot-soft:#FFF3E8;
  --hl:rgba(255,255,255,.95);--hl-soft:rgba(255,255,255,.38);
  --ink-soft:rgba(46,49,53,.06);--shadow-ink:rgba(46,49,53,.32);
  --shadow-coral:rgba(239,113,72,.10);--shadow-coral-pass:rgba(239,113,72,.14);
  --shadow-coral-cta:rgba(239,113,72,.45);--accent-ring:rgba(239,113,72,.28);
  --flag-red:#D7322B;--flag-hk:#DE2910;--flag-blue:#2E3C78;--flag-white:#FFFFFF;
  --flag-edge:rgba(46,49,53,.14);--veil:rgba(46,49,53,.32);--clear:transparent;
  --r-xl:20px;--r-lg:16px;--r-md:12px;--r-sm:8px;--r-mark:9px;--r-tiny:6px;--r-icon:7px;--r-pill:999px;--r-circle:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-xs:12px;--fs-tiny:11px;--fs-code:11.5px;--fs-label:13px;--fs-ui:13.5px;
  --fs-sm:14px;--fs-nav:14.5px;--fs-spec:15px;--fs-body:16px;--fs-lead:18px;--fs-brand:19px;
  --fs-h3:24px;--fs-h2:36px;--fs-h1:64px;--fs-mobile-h1:38px;--fs-doc:28px;
  --weight-normal:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;
  --tracking-tight:-.03em;--tracking-heading:-.02em;--tracking-small:-.01em;--tracking-button:-.005em;
  --gutter:24px;--shell:1248px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px;
  --space-section:80px;--motion-fast:.2s;--motion-reveal:.35s;
  --shadow-panel:inset 0 1px 0 var(--hl),0 18px 48px -24px var(--shadow-coral-pass);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{font-family:var(--font-body);font-size:var(--fs-body);color:var(--text);background:var(--bg);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-wrap:break-word}
img{max-width:100%;height:auto;vertical-align:middle}
svg{flex-shrink:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer;color:inherit}
button,a,summary{touch-action:manipulation}
button{border:0}
button:disabled,[aria-disabled="true"]{cursor:not-allowed}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--link);outline-offset:3px;border-radius:var(--r-sm)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{font-size:clamp(52px,5vw,var(--fs-h1));font-weight:var(--weight-heavy);line-height:1.1;letter-spacing:var(--tracking-heading);margin:0 0 24px}
h2{font-size:var(--fs-h2);line-height:1.2;letter-spacing:var(--tracking-heading);margin:0 0 24px}
h3{font-size:var(--fs-h3);line-height:1.3;letter-spacing:var(--tracking-small);margin:0 0 16px}
p{margin:0}
ul,ol{padding-left:1.5em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--side);border:1px solid var(--border);border-radius:var(--r-md)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.no-break{white-space:nowrap}
.shell,.wrap{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p,.muted{color:var(--muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-xl);padding:28px;box-shadow:var(--shadow-panel)}
.panel--warm{background:var(--panel2)}
.prose{max-width:820px;min-width:0;line-height:1.85}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-top:0;margin-bottom:24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a:not(.btn){color:var(--link);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.prose section{min-width:0}
.prose .steps{list-style:none;padding-left:0;counter-reset:guest-step}
.prose .steps>li{counter-increment:guest-step;position:relative;padding-left:48px;margin-bottom:24px}
.prose .steps>li::before{content:counter(guest-step);position:absolute;left:0;top:0;width:32px;height:32px;display:grid;place-items:center;border-radius:var(--r-circle);color:var(--accent-dark);background:var(--panel2);font-family:var(--font-mono)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;padding:0 28px;border-radius:var(--r-pill);font-size:var(--fs-body);font-weight:var(--weight-semibold);letter-spacing:var(--tracking-button);white-space:nowrap;flex-shrink:0;max-width:100%;transition:transform var(--motion-fast),box-shadow var(--motion-fast),background-color var(--motion-fast),color var(--motion-fast);background:var(--clear)}
.btn svg{width:16px;height:16px}
.btn--solid,.btn-primary{color:var(--panel);background:linear-gradient(180deg,var(--accent-hi),var(--accent));box-shadow:inset 0 1px 0 var(--hl-soft),0 12px 26px -12px var(--shadow-coral-cta)}
.btn--solid:hover,.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hl-soft),0 16px 30px -12px var(--shadow-coral-cta)}
.btn--line,.btn-secondary{color:var(--text);background:var(--clear);box-shadow:inset 0 0 0 1.5px var(--text)}
.btn--line:hover,.btn-secondary:hover{background:var(--text);color:var(--panel)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;transform:none;pointer-events:none}
.btn--small{height:42px;padding-inline:20px;font-size:var(--fs-sm)}
.btn--hover{background:var(--text);color:var(--panel)}
.btn--pressed{transform:translateY(1px)}
.btn--focus{outline:2px solid var(--link);outline-offset:3px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ic{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.solid{fill:currentColor}
.topbar{position:relative;z-index:40}
.topbar__in{height:var(--header-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:var(--fs-brand);letter-spacing:var(--tracking-heading);color:var(--text);flex:0 0 auto;white-space:nowrap}
.brand__mark{display:block;width:30px;height:30px;border-radius:var(--r-mark);flex-shrink:0}
.brand__zh{color:var(--muted);font-weight:var(--weight-medium)}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav a{display:block;padding:7px 13px;border-radius:var(--r-pill);font-size:var(--fs-nav);font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:color var(--motion-fast),background-color var(--motion-fast)}
.mainnav a:hover{color:var(--text);background:var(--ink-soft)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold);background:var(--panel2);box-shadow:inset 0 0 0 1px var(--border)}
.topbar__tools{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:0 10px;border-radius:var(--r-pill);font-size:var(--fs-sm);color:var(--muted);background:var(--clear);white-space:nowrap}
.lang:hover{background:var(--ink-soft);color:var(--text)}
.lang svg{width:16px;height:16px}
.lang__txt{white-space:nowrap}
.language__panel{position:absolute;right:0;top:calc(100% + 8px);z-index:60;min-width:176px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);padding:8px;box-shadow:var(--shadow-panel)}
.language__panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-sm)}
.language__panel a:hover,.language__panel a[aria-current="true"]{background:var(--panel2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-nav);font-weight:var(--weight-semibold);white-space:nowrap;transition:background-color var(--motion-fast)}
.login:hover{background:var(--accent-dark)}
.menu-btn{display:none;min-width:44px;min-height:44px;border-radius:var(--r-pill);align-items:center;justify-content:center;color:var(--text);background:var(--clear);box-shadow:inset 0 0 0 1px var(--border)}
.menu-btn svg{width:20px;height:20px}
.mobile-nav{position:fixed;top:var(--header-height);right:0;left:0;z-index:42;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}
.mobile-nav a{display:flex;align-items:center;justify-content:flex-start;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-md);font-size:var(--fs-body)}
.mobile-nav a:hover,.mobile-nav a[aria-current]{background:var(--panel2)}
.mobile-nav__languages{border-top:1px solid var(--border);padding-top:12px;margin-top:12px}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:41;background:var(--veil)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--side);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px}
.footer-brand{min-width:0}
.footer-brand p{max-width:320px;color:var(--muted);font-size:var(--fs-sm);margin-top:20px;line-height:1.8}
.footer-title{font-size:var(--fs-sm);font-weight:var(--weight-bold);margin:0 0 16px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:var(--fs-sm)}
.footer-links a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;border-top:1px solid var(--border);margin-top:36px;padding-top:24px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-sm);color:var(--muted)}
.footer-languages a[aria-current]{color:var(--text);font-weight:var(--weight-semibold)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:var(--fs-label);color:var(--muted)}
.footer-legal{display:flex;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity var(--motion-reveal) ease,transform var(--motion-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(max-width:1200px){
  .mainnav a{padding:7px 9px;font-size:var(--fs-ui)}
  .topbar__in{gap:16px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .topbar__in{justify-content:space-between}
  .topbar__tools{margin-left:auto}
  .menu-btn{display:inline-flex}
}
@media(min-width:1101px){
  .mobile-nav,.menu-veil{display:none!important}
}
@media(max-width:768px){
  :root{--fs-h2:28px;--fs-h3:22px;--space-section:56px}
  h1{font-size:var(--fs-mobile-h1)}
  .grid--three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .lang__txt{display:none}
  .topbar__in{gap:8px}
  .topbar__tools{gap:4px;margin-left:auto}
  .brand{gap:7px;font-size:var(--fs-body)}
  .brand__mark{width:27px;height:27px}
  .login{padding-inline:14px;font-size:var(--fs-sm)}
  .lang{padding-inline:8px}
  .btn{padding-inline:22px}
  .panel,.card{padding:20px}
  .tilt,[data-tilt]{transform:none!important}
}
@media(max-width:350px){
  .brand{font-size:var(--fs-sm);gap:6px}
  .brand__mark{width:24px;height:24px}
  .login{padding-inline:11px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.mainnav a,.login{transition:none}
}