:root{
  --bg:#F8F2E7;--bg-top:#FBF7EF;--bg-bottom:#F2EADC;
  --panel:#FFFCF6;--panel-2:#F0E7D7;--border:#E2D6C2;--border-soft:#EBE1D0;
  --accent:#D4553A;--accent-dark:#A63F27;--text:#2A2119;--muted:#6F6253;
  --success:#2F8F6A;--success-soft:#E6EFE5;--success-ring:rgba(47,143,106,.18);
  --warn:#B7791F;--error:#B3261E;--on-accent:#FFFCF6;
  --accent-soft:rgba(212,85,58,.12);--glow:rgba(212,85,58,.055);
  --shadow-tint:rgba(212,85,58,.10);--shadow-tint-2:rgba(212,85,58,.14);
  --shadow-ink:rgba(42,33,25,.06);--hi:rgba(255,255,255,.82);
  --button-hi:rgba(255,255,255,.28);--button-ring:rgba(255,252,246,.42);
  --send-hi:rgba(255,255,255,.3);--dot:rgba(58,40,24,.12);
  --veil:rgba(42,33,25,.32);--clear:transparent;
  --flag-red:#C8322B;--flag-blue:#2B3F73;--flag-white:#FFFFFF;--flag-black:#2A2119;--flag-gold:#E0A93A;
  --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','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --r-xs:4px;--r-sm:6px;--r-md:8px;--r-lg:10px;--r-xl:12px;--r-pill:999px;--r-circle:50%;
  --shell:1200px;--gutter:24px;--header-height:64px;--anchor-offset:80px;--toc-offset:140px;
  --size-body:15px;--size-h1:64px;--size-h2:32px;--size-h3:22px;
  --weight-body:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-display:800;
  --shadow-panel:inset 0 1px 0 var(--hi),0 1px 2px var(--shadow-ink),0 18px 36px -20px var(--shadow-tint-2);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
button,summary,a{-webkit-tap-highlight-color:var(--accent-soft)}
:where(a,button,input,textarea,select,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
[hidden]{display:none!important}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,blockquote,figure{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.6vw,var(--size-h1));font-weight:var(--weight-display);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--size-h2);font-weight:var(--weight-display);line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--size-h3);font-weight:var(--weight-bold);line-height:1.4}
code,kbd,pre,.mono{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2)}
pre code{overflow-wrap:normal}
:where(main,section,article,div,li){min-width:0}
.shell,.wrap{width:100%;max-width:calc(var(--shell) + 2 * var(--gutter));padding-inline:var(--gutter);margin-inline:auto}
.shell{max-width:var(--shell)}
.section{padding-top:64px;padding-bottom:72px}
.section-head{margin-bottom:28px}
.section-head p{margin-top:12px;max-width:720px;color:var(--muted);font-size:16px}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.skip{position:absolute;left:16px;top:-80px;z-index:100;padding:8px 14px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);font-size:13px}
.skip:focus{top:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:46px;padding:0 20px;border-radius:var(--r-md);font-size:16px;font-weight:var(--weight-semibold);border:1px solid var(--border);white-space:nowrap;flex-shrink:0;transition:transform .18s ease,background .18s ease}
.btn:hover{transform:translateY(-1px)}
.btn:active,.btn.is-pressed{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;pointer-events:none}
.btn:has(.btn-key){padding-right:10px}
.btn-key{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:var(--r-xs);flex-shrink:0}
.btn-key svg{width:14px;height:14px}
.btn-primary{color:var(--on-accent);background:linear-gradient(180deg,var(--accent),color-mix(in srgb,var(--accent) 78%,var(--accent-dark)));border-color:var(--accent-dark);box-shadow:inset 0 1px 0 var(--button-hi),0 10px 24px -10px var(--shadow-tint-2),0 2px 4px var(--shadow-tint)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary .btn-key{border:1px solid var(--button-ring)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);box-shadow:inset 0 1px 0 var(--hi),0 1px 2px var(--shadow-ink)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--muted)}
.btn-ghost .btn-key{border:1px solid var(--border);color:var(--muted)}
.text-link{display:inline-flex;align-items:center;min-height:28px;gap:6px;text-decoration:underline;text-underline-offset:4px}
.card,.panel{padding:24px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--shadow-panel)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.reveal{transition:opacity .35s ease,transform .35s 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}
.prose{max-width:820px;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:18px}
.prose h2{margin-top:40px;margin-bottom:18px}
.prose h3{margin-top:28px;margin-bottom:12px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{list-style:decimal;padding-left:24px}
.prose a{text-decoration:underline;text-underline-offset:4px}
.prose li+li{margin-top:8px}
html.nav-open{overflow:hidden}
#site-header{position:relative;z-index:50;min-height:var(--header-height)}
.topbar{position:relative;z-index:53;background:var(--bg-top);border-bottom:1px solid var(--border-soft)}
.topbar-inner{height:var(--header-height);display:flex;align-items:center;gap:28px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:36px}
.brand img{display:block;width:28px;height:28px;flex:none}
.brand-en{font-family:var(--font-display);font-size:18px;font-weight:var(--weight-display);letter-spacing:-.02em;white-space:nowrap}
.brand-zh{font-size:14px;font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap}
.tabs-nav{flex:1;min-width:0}
.tabs-nav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:1px}
.tabs-nav a{position:relative;display:flex;align-items:center;height:64px;padding:0 12px;font-size:14px;font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap}
.tabs-nav a::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;border-radius:var(--r-pill);background:var(--accent);transform:scaleX(0);opacity:0;transition:transform .22s ease,opacity .22s ease}
.tabs-nav a:hover{color:var(--text)}
.tabs-nav a:hover::after{transform:scaleX(.6);opacity:.45}
.tabs-nav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.tabs-nav a[aria-current="page"]::after{transform:scaleX(1);opacity:1}
.topbar-tools{display:flex;align-items:center;gap:16px;flex-shrink:0}
.lang-wrap{position:relative}
.lang-button,.lang{display:flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:24px;width:auto;padding:0;border:0;background:var(--clear);font-size:14px;color:var(--muted)}
.lang-button span,.lang span{white-space:nowrap}
.lang-button svg,.lang svg{width:16px;height:16px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:60;min-width:164px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:36px;padding:0 14px;border-radius:var(--r-md);background:var(--panel);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hi),0 1px 2px var(--shadow-ink);font-size:14px;font-weight:var(--weight-semibold);white-space:nowrap}
.btn-login svg{width:14px;height:14px;color:var(--muted)}
.btn-login:hover{border-color:var(--muted)}
.menu-button{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel)}
.menu-button svg{width:20px;height:20px}
.mobile-drawer{position:fixed;z-index:52;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;padding:16px var(--gutter) 32px;background:var(--panel)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 14px;border-bottom:1px solid var(--border-soft)}
.mobile-drawer a[aria-current]{background:var(--panel-2);font-weight:var(--weight-semibold)}
.drawer-languages{margin-top:20px;border-top:1px solid var(--border)}
.menu-veil{position:fixed;z-index:51;inset:var(--header-height) 0 0;background:var(--veil);border:0}
.site-footer{padding-top:48px;padding-bottom:28px;border-top:1px solid var(--border);background:var(--panel-2)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.footer-brand p{margin-top:16px;max-width:340px;color:var(--muted)}
.footer-title{font-size:14px;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,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:13px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border);font-size:12px;color:var(--muted)}
.footer-languages,.footer-legal{display:flex;flex-wrap:wrap;gap:8px 16px}
@media(min-width:861px){.mobile-drawer,.menu-veil{display:none!important}}
@media(max-width:1180px){.topbar-inner{gap:18px}.tabs-nav a{padding-inline:9px}.tabs-nav a::after{left:9px;right:9px}.brand-zh{display:none}}
@media(max-width:1080px){.tabs-nav a{font-size:12px;padding-inline:7px}.topbar-tools{gap:10px}.lang-button span{display:none}}
@media(max-width:860px){.tabs-nav{display:none}.menu-button{display:flex}.topbar-tools{margin-left:auto}.topbar-inner{gap:12px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:768px){h1{font-size:40px;line-height:1.15}.grid{grid-template-columns:1fr}.section{padding-top:44px;padding-bottom:48px}}
@media(max-width:640px){:root{--gutter:16px}.no-break{white-space:normal}.tilt,.float-cover,.ticket-wrap,.stamp-tilt{transform:none}.decorated{overflow-x:clip;max-width:100%}.footer-grid{grid-template-columns:1fr;gap:28px}h2{font-size:26px}.topbar-inner{gap:8px}.topbar-tools{gap:8px}.brand{gap:7px}.brand-en{font-size:16px}.btn-login{padding-inline:10px}.lang-button{min-width:28px}.lang-button span{display:none}.card,.panel{padding:20px}}
@media(max-width:359px){.brand img{width:24px;height:24px}.brand-en{font-size:14px}.topbar-tools{gap:5px}.btn-login svg{display:none}.btn-login{padding-inline:9px}.menu-button{min-width:44px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.reveal,.reveal.pending{opacity:1;transform:none}}