:root{
  --bg:#F7F7F5;
  --panel:#FFFFFF;
  --panel-2:#EFEEEA;
  --border:#E2E0DA;
  --accent:#F2A007;
  --accent-dark:#9A5B00;
  --ink:#18171C;
  --muted:#5E5C66;
  --success:#1E9E5A;
  --warn:#C2620A;
  --error:#D23A3A;
  --flag-red:#D8202F;
  --flag-white:#FFFFFF;
  --flag-blue:#2A3A8C;
  --flag-navy:#13286D;
  --flag-black:#1C1B1F;
  --flag-gold:#F6C500;
  --mask:#000000;
  --clear:transparent;
  --tint-6:color-mix(in srgb,var(--accent) 6%,transparent);
  --tint-8:color-mix(in srgb,var(--accent) 8%,transparent);
  --tint-10:color-mix(in srgb,var(--accent) 10%,transparent);
  --tint-12:color-mix(in srgb,var(--accent) 12%,transparent);
  --tint-22:color-mix(in srgb,var(--accent) 22%,transparent);
  --tint-30:color-mix(in srgb,var(--accent) 30%,transparent);
  --accent-wash:color-mix(in srgb,var(--accent) 13%,var(--panel));
  --accent-bubble:color-mix(in srgb,var(--accent) 17%,var(--panel));
  --ink-4:color-mix(in srgb,var(--ink) 4%,transparent);
  --ink-8:color-mix(in srgb,var(--ink) 8%,transparent);
  --ink-12:color-mix(in srgb,var(--ink) 12%,transparent);
  --ink-22:color-mix(in srgb,var(--ink) 22%,transparent);
  --ink-40:color-mix(in srgb,var(--ink) 40%,transparent);
  --veil:color-mix(in srgb,var(--ink) 40%,transparent);
  --hi:color-mix(in srgb,var(--panel) 78%,transparent);
  --bg-deep:color-mix(in srgb,var(--panel-2) 78%,var(--bg));
  --tile-bg:color-mix(in srgb,var(--panel) 70%,var(--panel-2));
  --font-display:Georgia,'Times New Roman','Songti SC','STSong','Noto Serif CJK SC','Source Han Serif SC','SimSun',serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --r-window:12px;
  --r-tile:10px;
  --r-sm:8px;
  --r-btn:22px;
  --r-icon:13px;
  --r-brand:9px;
  --r-ghost:18px;
  --r-pill:999px;
  --edge:7px;
  --grain:.55;
  --gutter:24px;
  --page-width:1288px;
  --header-height:69px;
  --anchor-offset:88px;
  --toc-offset:16px;
  --chapter-offset:100px;
  --shadow-panel:inset 0 1px 0 var(--panel),0 0 0 1px var(--hi),0 24px 64px -24px var(--tint-30);
  --ease: cubic-bezier(.2,.7,.3,1);
  --duration:.18s;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
img{max-width:100%;height:auto;vertical-align:middle}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
button:disabled{cursor:not-allowed}
a{color:inherit;text-decoration:none}
ul{list-style:none}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-sm)}
::selection{background:var(--accent-bubble);color:var(--ink)}
.wrap{width:100%;max-width:var(--page-width);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:88px;padding-bottom:88px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p{margin-top:14px;color:var(--muted)}
h1,h2,h3{font-family:var(--font-display);font-weight:400;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.6vw,66px);line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,42px);line-height:1.2;letter-spacing:-.02em}
h3{font-size:25px;line-height:1.35}
p{overflow-wrap:break-word}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-link{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-window);box-shadow:var(--shadow-panel)}
.card{padding:28px}
.panel{padding:32px}
.badge,.tag{display:inline-flex;align-items:center;min-height:26px;max-width:100%;padding:3px 10px;background:var(--accent-wash);color:var(--accent-dark);border-radius:var(--r-pill);font-size:12px;font-weight:600;overflow-wrap:anywhere}
.tag{background:var(--panel-2);color:var(--ink)}
.badge.is-success{background:color-mix(in srgb,var(--success) 12%,var(--panel));color:var(--success)}
.prose{max-width:820px;font-size:16px;line-height:1.9;min-width:0}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:20px}
.prose h2{margin-top:56px;margin-bottom:22px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul{list-style:disc;padding-left:1.5em}
.prose ol{padding-left:1.5em}
.prose li+li{margin-top:8px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-sm);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-tile)}
pre code{padding:0;white-space:pre;overflow-wrap:normal}
.btn,.btn-primary,.btn-secondary,.btn-login,.btn-ghost,.btn-main{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;min-height:44px;font-weight:600;transition:transform var(--duration) var(--ease),background var(--duration) var(--ease),border-color var(--duration) var(--ease)}
.btn,.btn-primary{padding:11px 22px;border-radius:var(--r-btn);background:var(--ink);color:var(--panel);border:1px solid var(--ink)}
.btn:hover,.btn-primary:hover{transform:translateY(-2px)}
.btn-secondary{padding:11px 22px;border:1px solid var(--ink-22);border-radius:var(--r-ghost);background:var(--panel);color:var(--ink)}
.btn-secondary:hover{border-color:var(--ink-40);background:var(--accent-wash)}
.btn:active,.btn-primary:active,.btn-main:active{transform:translateY(0)}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled{opacity:.5;transform:none}
.btn-main{height:60px;padding:0 26px 0 8px;border-radius:var(--r-btn);background:var(--ink);color:var(--panel);gap:14px;font-size:19px;letter-spacing:.01em;box-shadow:inset 0 1px 0 color-mix(in srgb,var(--panel) 16%,transparent),0 16px 30px -14px var(--ink-40),0 22px 44px -20px var(--tint-30)}
.btn-main:hover{transform:translateY(-2px)}
.btn-icon{width:44px;height:44px;border-radius:var(--r-icon);background:var(--panel);display:grid;place-items:center;box-shadow:inset 0 -2px 0 var(--ink-8)}
.btn-arrow{color:color-mix(in srgb,var(--panel) 70%,transparent)}
.btn-ghost{height:52px;padding:0 24px;border-radius:var(--r-ghost);border:1px solid var(--ink-22);background:color-mix(in srgb,var(--panel) 60%,transparent);font-size:16px}
.btn-ghost:hover{border-color:var(--ink-40)}
.cta-row{margin-top:28px;display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.band{position:relative;isolation:isolate;background:var(--accent);color:var(--ink)}
.grain{position:absolute;inset:0;width:100%;height:100%;z-index:-1;mix-blend-mode:overlay;opacity:var(--grain);pointer-events:none}
.topband{position:relative;z-index:50;padding-bottom:var(--edge);background:var(--clear)}
.topband::before{content:"";position:absolute;inset:0;z-index:-1;background-color:var(--accent);background-image:var(--noise-image);background-blend-mode:soft-light;mask:linear-gradient(var(--mask),var(--mask)) 0 0/100% calc(100% - var(--edge)) no-repeat,radial-gradient(circle at 50% 0,var(--mask) 6px,transparent 6.6px) 0 100%/12px var(--edge) repeat-x}
:root{--noise-image: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='.88' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.06'/%3E%3C/svg%3E")}
.topbar{height:62px;display:flex;align-items:center;gap:32px;flex-wrap:nowrap;position:relative;z-index:53}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.01em;flex-shrink:0;min-height:34px}
.brand-base{width:34px;height:34px;border-radius:var(--r-brand);background:var(--panel);display:grid;place-items:center;flex-shrink:0;box-shadow:inset 0 -1px 0 var(--ink-8),0 4px 12px -5px color-mix(in srgb,var(--accent-dark) 55%,transparent)}
.brand-base img{width:25px;height:25px}
.brand-zh{font-weight:500;color:var(--muted)}
.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:26px}
.mainnav a{display:inline-flex;align-items:center;min-height:36px;font-size:14.5px;font-weight:500;white-space:nowrap;letter-spacing:.005em}
.mainnav a[aria-current="page"]{font-weight:750}
.mainnav a:hover{color:var(--accent-dark)}
.top-actions{display:flex;align-items:center;gap:18px;flex-shrink:0}
.lang-switch{position:relative}
.lang-button{font-size:14px;font-weight:500;white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:36px;min-width:44px;width:auto}
.lang-button span{white-space:nowrap}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-window);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-sm);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-wash);color:var(--accent-dark)}
.btn-login{height:36px;min-height:36px;padding:0 20px;border-radius:var(--r-pill);background:var(--panel);font-size:14px;box-shadow:inset 0 -1px 0 var(--ink-8),0 6px 14px -8px color-mix(in srgb,var(--accent-dark) 70%,transparent)}
.btn-login:hover{transform:translateY(-1px)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px;border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"]{background:var(--accent-wash)}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:52;background:var(--panel);padding:16px var(--gutter) 32px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--accent-wash);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--veil);z-index:51;cursor:pointer}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:64px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:56px}
.footer-grid>*{min-width:0}
.footer-intro p{max-width:340px;margin-top:16px;color:var(--muted)}
.footer-heading{font-family:var(--font-body);font-size:14px;font-weight:750;margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 20px}
.footer-links a{display:inline-flex;align-items:center;min-height:30px;font-size:14px}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:30px;font-size:13px}
.footer-languages a[aria-current]{color:var(--accent-dark);font-weight:700}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);color:var(--muted);font-size:12px}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.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:block;min-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
@media(min-width:961px) and (max-width:1279px){
  .topbar{gap:18px}
  .mainnav ul{gap:16px}
  .mainnav a{font-size:13px}
  .top-actions{gap:12px}
}
@media(max-width:960px){
  .mainnav{display:none}
  .top-actions{margin-left:auto;gap:12px}
  .menu-toggle{display:flex}
  .footer-grid{gap:32px;grid-template-columns:1fr 1fr}
  .footer-intro{grid-column:1/-1}
}
@media(min-width:961px){
  .mobile-drawer,.menu-veil{display:none}
}
@media(max-width:768px){
  h1{font-size:36px}
  .section{padding-top:56px;padding-bottom:56px}
  .grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .topbar{gap:8px}
  .brand{font-size:16px;gap:7px}
  .brand-base{width:30px;height:30px}
  .brand-base img{width:23px;height:23px}
  .top-actions{gap:6px;margin-left:auto}
  .lang-button{font-size:12px;gap:2px}
  .btn-login{padding-inline:12px;font-size:13px}
  .footer-grid{grid-template-columns:1fr}
  .footer-intro{grid-column:auto}
  .panel,.card{padding:22px}
  .prose{font-size:15px}
  .tilt,[data-tilt]{transform:none!important}
  .decor-zone{overflow-x:clip;max-width:100%}
  .btn-main{height:54px;font-size:17px;padding-right:20px;gap:12px}
  .btn-icon{width:40px;height:40px;border-radius:var(--r-window)}
  .btn-ghost{height:48px}
}
@media(max-width:359px){
  .brand{font-size:14px;gap:5px}
  .brand-base{width:26px;height:26px}
  .brand-base img{width:21px;height:21px}
  .top-actions{gap:3px}
  .btn-login{padding-inline:9px}
  .lang-button{font-size:11px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}