:root{
  color-scheme:light;
  --bg:#F8F0E0;
  --bg-top:#FCF7EC;
  --bg-bottom:#F3E8D4;
  --panel:#FFFBF3;
  --panel-2:#F1E6D2;
  --border:#E3D5BD;
  --accent:#FFCC14;
  --accent-dark:#8C6400;
  --text:#1E1812;
  --muted:#6E6253;
  --success:#1E9E61;
  --warn:#D9822B;
  --error:#D23C33;
  --c-violet:#B9A7F5;
  --c-mint:#ABE0C6;
  --c-coral:#F2805E;
  --c-pink:#F2A9C0;
  --c-apricot:#F6B98A;
  --flag-red:#D7313C;
  --flag-blue:#283A8C;
  --flag-white:#FFFFFF;
  --ink-06:rgba(30,24,18,.06);
  --ink-10:rgba(30,24,18,.10);
  --ink-14:rgba(30,24,18,.14);
  --ink-24:rgba(30,24,18,.24);
  --ink-40:rgba(30,24,18,.40);
  --ink-72:rgba(30,24,18,.72);
  --paper-30:rgba(255,251,243,.30);
  --paper-50:rgba(255,251,243,.50);
  --paper-75:rgba(255,251,243,.78);
  --edge-hi:rgba(255,255,255,.72);
  --sheen:rgba(255,255,255,.38);
  --glow:rgba(255,251,243,.46);
  --clear:transparent;
  --shadow-card:0 24px 48px rgba(140,100,0,.12),0 8px 18px -8px rgba(112,52,30,.24);
  --shadow-float:0 18px 40px rgba(140,100,0,.12),0 6px 14px -6px rgba(30,24,18,.34);
  --shadow-soft:0 16px 40px rgba(140,100,0,.12),0 2px 6px rgba(30,24,18,.05);
  --shadow-btn:0 12px 24px -12px rgba(30,24,18,.55);
  --shadow-groove:inset 0 1px 3px rgba(30,24,18,.07);
  --shadow-toggle:0 2px 4px var(--ink-24);
  --shadow-cursor:0 4px 6px rgba(30,24,18,.28);
  --r-dot:2px;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:10px;
  --r-lg:12px;
  --r-circle:50%;
  --r-pill:999px;
  --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,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --fs-xs:12px;
  --fs-sm:14px;
  --fs-body:16px;
  --fs-lede:20px;
  --fs-h3:24px;
  --fs-h2:36px;
  --fs-h1:clamp(52px,4.72vw,68px);
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --weight-display:900;
  --gutter:48px;
  --notice-h:40px;
  --head-h:68px;
  --header-stack:calc(var(--notice-h) + var(--head-h));
  --anchor-gap:124px;
  --toc-offset:16px;
  --toc-landing:100px;
  --hero-h:clamp(660px,calc(100svh - 164px),860px);
  --stage-scale:1;
  --duration-fast:.2s;
  --duration-reveal:.35s;
  --paper-grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Cpath filter='url(%23n)' d='M0 0h160v160H0z'/%3E%3C/svg%3E");
}
*,*::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(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{border:0;padding:0;background:var(--clear);cursor:pointer}
button:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}
input,select,textarea{max-width:100%;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);padding:12px}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-xs)}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
h1,h2,h3{font-family:var(--font-display);overflow-wrap:break-word;text-wrap:balance}
h1{font-size:var(--fs-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);font-weight:var(--weight-normal);line-height:1.3;letter-spacing:-.015em}
h3{font-size:var(--fs-h3);font-weight:var(--weight-semibold);line-height:1.4}
ul,ol{padding-left:1.5em;margin:0}
ul.clean-list{list-style:none;padding:0}
li+li{margin-top:6px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th{text-align:left}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:1280px;margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:850px;margin-bottom:32px}
.section-head p{margin-top:12px;color:var(--muted);font-size:var(--fs-lede)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.small{font-size:var(--fs-sm)}
.stack{display:grid;gap:24px;min-width:0}
.grid-two,.grid-three{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
:where(.wrap,.stack,.grid-two,.grid-three,.hero,.footer-grid)>*{min-width:0}
.surface{background:var(--panel);border-radius:var(--r-lg);box-shadow:inset 0 0 0 1px var(--edge-hi),var(--shadow-soft);padding:28px}
.groove{background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-groove);padding:24px}
.decor-zone{position:relative;isolation:isolate;overflow-x:clip}
.decor-layer{position:absolute;inset:0;max-width:100%;pointer-events:none}
.prose{max-width:850px;min-width:0}
.prose>:where(p,ul,ol,pre,blockquote,table,details){margin-top:20px}
.prose h2{margin-top:52px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose p{line-height:1.85}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 26px;border-radius:var(--r-md);font-size:var(--fs-body);font-weight:var(--weight-bold);line-height:1.4;white-space:nowrap;flex-shrink:0;transition:transform var(--duration-fast) ease,box-shadow var(--duration-fast) ease,background-color var(--duration-fast) ease}
.btn .ico{width:18px;height:18px}
.btn-primary{background:var(--text);color:var(--panel);box-shadow:var(--shadow-btn)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost,.btn-secondary{color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn-small{min-height:38px;padding:8px 16px;font-size:var(--fs-sm);border-radius:var(--r-sm)}
.btn.is-hover{transform:translateY(-2px)}
.btn.is-pressed{transform:translateY(1px);box-shadow:var(--shadow-groove)}
.btn.is-focus{outline:2px solid var(--accent-dark);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:28px;text-decoration:underline;text-underline-offset:5px}
.ico{display:block;flex:none;width:16px;height:16px}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.flag{display:block;flex:none;width:24px;height:16px;border-radius:var(--r-dot);overflow:hidden}
.flag-lg{width:30px;height:20px}
.fr{fill:var(--flag-red)}
.fw{fill:var(--flag-white)}
.fb{fill:var(--flag-blue)}
.fe{fill:none;stroke:var(--ink-14);stroke-width:1}
.reveal{transition:opacity var(--duration-reveal) ease,transform var(--duration-reveal) 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%;min-height:120px;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
.notice{background:var(--c-violet);color:var(--text);height:var(--notice-h);display:flex;align-items:center;justify-content:center;padding:0 var(--gutter);font-size:13.5px}
.notice-in{display:flex;align-items:center;gap:14px;min-width:0}
.notice-mark{width:20px;height:20px;flex:none;display:block}
.notice p{display:flex;align-items:baseline;gap:12px}
.notice strong{font-weight:var(--weight-bold)}
.notice-sub{color:var(--ink-72);font-family:var(--font-mono);font-size:var(--fs-xs);white-space:nowrap}
.notice-btn{display:inline-flex;align-items:center;justify-content:center;flex:none;min-height:26px;padding:3px 12px;border-radius:var(--r-xs);background:var(--text);color:var(--panel);font-size:12.5px;font-weight:var(--weight-semibold);transition:transform var(--duration-fast) ease;white-space:nowrap}
.notice-btn:hover{transform:translateY(-1px)}
#site-header{position:relative;z-index:60}
.site-head{height:var(--head-h);display:flex;align-items:center;flex-wrap:nowrap;padding:0 var(--gutter);background:var(--bg-top);border-bottom:1px solid var(--border);position:relative;z-index:65}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:30px;height:30px;display:block}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--fs-lede);letter-spacing:-.02em}
.brand-zh{font-weight:var(--weight-medium);font-size:var(--fs-sm);color:var(--muted)}
.nav{margin-left:36px;flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav li{margin:0;flex:none}
.nav-more{position:relative}
.nav-more-toggle{display:flex;align-items:center;gap:6px;min-height:38px;padding:0 10px;border:0;background:transparent;color:var(--text);border-radius:var(--r-sm);font:inherit;font-size:var(--fs-sm);font-weight:var(--weight-medium);white-space:nowrap;cursor:pointer}
.nav-more-toggle:hover,.nav-more-toggle[aria-expanded="true"]{background:var(--panel-2)}
.nav .nav-more-panel{position:absolute;top:calc(100% + 10px);right:0;display:grid;gap:4px;min-width:220px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float);z-index:90}
.nav .nav-more-panel a{height:auto;min-height:44px;padding:10px 12px}
.nav .nav-more-panel .lbl{position:static;width:auto;height:auto;overflow:visible;clip:auto;white-space:nowrap}
.nav a{display:flex;align-items:center;gap:6px;height:38px;padding:0 10px;border-radius:var(--r-sm);font-size:var(--fs-sm);font-weight:var(--weight-medium);white-space:nowrap;transition:background-color var(--duration-fast) ease}
.nav .ico{color:var(--muted)}
.nav a:hover{background:var(--panel-2)}
.nav a[aria-current="page"]{background:var(--panel);box-shadow:inset 0 0 0 1px var(--border)}
.nav a[aria-current="page"] .ico{color:var(--accent-dark)}
.lbl{display:inline}
.head-tools{margin-left:auto;display:flex;align-items:center;gap:10px;flex:none}
.language{position:relative}
.lang{display:flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:0 12px;border-radius:var(--r-sm);font-size:var(--fs-sm);color:var(--muted)}
.lang:hover{background:var(--panel-2)}
.lang-txt{white-space:nowrap}
.lang-caret{font-size:11px}
.language-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:90;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.language-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);white-space:nowrap}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;padding:8px 16px;border-radius:var(--r-sm);background:var(--text);color:var(--panel);font-size:var(--fs-sm);font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:var(--shadow-btn);transition:transform var(--duration-fast) ease}
.btn-login:hover{transform:translateY(-1px)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--r-sm);background:var(--panel-2);color:var(--text)}
.menu-lines{display:grid;gap:4px}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-dot)}
.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)}
.nav-drawer{position:fixed;inset-inline:0;top:var(--header-stack);height:calc(100dvh - var(--header-stack));max-height:calc(100dvh - var(--header-stack));z-index:63;background:var(--panel);padding:16px var(--gutter) 32px;overflow-y:auto;overscroll-behavior:contain}
.nav-drawer ul{list-style:none;margin:0;padding:0}
.nav-drawer li{margin:0}
.nav-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm)}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.drawer-heading{padding:8px 16px;font-size:var(--fs-xs);color:var(--muted)}
.nav-veil{position:fixed;inset:var(--header-stack) 0 0;z-index:61;background:var(--ink-40)}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{margin-top:18px;max-width:28em;color:var(--muted)}
.footer-title{font-size:var(--fs-sm);font-weight:var(--weight-bold);margin-bottom:16px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-sm)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-sm)}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-bold);color:var(--accent-dark)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:var(--fs-xs);color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
@media(min-width:821px){.nav-drawer,.nav-veil{display:none!important}}
@media(max-width:1360px){:root{--stage-scale:.92}}
@media(max-width:1280px){.nav{margin-left:24px}.nav a{padding:0 8px;font-size:13.5px}}
@media(max-width:1180px){.nav a .lbl{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.nav a{padding:0 10px}}
@media(max-width:1100px){:root{--gutter:32px;--stage-scale:.74}}
@media(max-width:960px){:root{--stage-scale:.66}.footer-grid{gap:28px}}
@media(max-width:820px){.nav{display:none}.menu-toggle{display:flex}.head-tools{margin-left:auto}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:768px){
  :root{--gutter:20px;--fs-h1:clamp(28px,9.6vw,40px);--fs-h2:26px;--fs-h3:21px;--fs-lede:18px}
  .grid-two,.grid-three{grid-template-columns:minmax(0,1fr)}
  .section{padding-top:56px;padding-bottom:56px}
  .surface{padding:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .notice-sub{display:none}
  .notice p{font-size:12px}
  .notice-in{gap:8px}
  .notice-mark{width:16px;height:16px}
  .notice-btn{padding-inline:8px}
  .lang-txt{display:none}
  .lang{padding-inline:8px}
  .head-tools{gap:6px;margin-left:auto}
  .brand{gap:6px}
  .brand-mark{width:26px;height:26px}
  .brand-en{font-size:18px}
  .btn-login{padding-inline:12px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-brand{grid-column:auto}
  .tilt,.tilt-card,.tilt-content{transform:none!important}
  .decor-layer{max-width:100%}
  .wrap{padding-inline:var(--gutter)}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .site-head{padding-inline:16px}
  .brand-en{font-size:16px}
  .brand-mark{width:24px;height:24px}
  .btn-login{padding-inline:10px}
  .head-tools{gap:4px}
  .notice-mark{display:none}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}