:root{
  --bg:#FBF2E6;--bg-top:#FDF8F0;--bg-bottom:#F3E8D8;--panel:#FFFCF7;--panel-2:#F3E8D8;--border:#E6D8C4;--accent:#5E2A8C;--accent-dark:#45196A;--text:#2A1F17;--muted:#6E5E50;--success:#2E8B57;--warn:#C9821B;--error:#C23B32;--coral:#F07A5C;--honey:#F2C14E;--lilac:#E9DDF7;--peach:#F9D2C2;--flag-red:#D52B3A;--flag-white:#FFFFFF;--flag-blue:#2B3A80;--clear:transparent;--hi:rgba(255,255,255,.92);--hi-soft:rgba(255,255,255,.45);--veil:rgba(42,31,23,.25);
  --b1:var(--lilac);--b2:color-mix(in srgb,var(--accent) 6%,var(--lilac));--b3:color-mix(in srgb,var(--accent) 11%,var(--lilac));--b4:color-mix(in srgb,var(--accent) 15%,var(--lilac));--b5:color-mix(in srgb,var(--accent) 18%,var(--lilac));--b6:color-mix(in srgb,var(--b5) 72%,var(--peach));--b7:color-mix(in srgb,var(--b5) 48%,var(--peach));--b8:color-mix(in srgb,var(--b5) 24%,var(--peach));--b9:var(--peach);
  --shadow-window:0 60px 120px -40px rgba(94,42,140,.12),0 24px 48px -24px rgba(94,42,140,.12),0 2px 4px rgba(69,25,106,.05);--shadow-float:0 24px 48px -18px rgba(94,42,140,.16),0 6px 14px -6px rgba(94,42,140,.10);--shadow-card:0 12px 28px -18px rgba(94,42,140,.14),0 1px 2px rgba(42,31,23,.04);--shadow-cta:inset 0 1px 0 rgba(255,255,255,.18),0 14px 26px -12px rgba(94,42,140,.45);
  --r-xl:24px;--r-lg:20px;--r-md:16px;--r-sm:10px;--r-xs:6px;--r-band:15px;--r-helper:18px;--r-input:14px;--r-pill:999px;--r-round: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-body:16px;--fs-small:14px;--fs-caption:12px;--fs-display:64px;--fs-h2:36px;--fs-h3:22px;--weight-display:800;--weight-bold:700;--weight-medium:600;--tracking-display:-.03em;
  --gutter:32px;--content-max:1344px;--header-height:64px;--anchor-gap:80px;--toc-offset:16px;--toc-landing:104px;--section-space:80px;--ease-out:cubic-bezier(.2,.7,.2,1);--time-fast:.16s;--time-reveal:.35s;
  --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 values='0 0 0 0 .16 0 0 0 0 .12 0 0 0 0 .09 0 0 0 .03 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%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}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--grain),var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto;vertical-align:middle}
svg{width:20px;height:20px;flex-shrink:0;vertical-align:middle}
p{margin:0}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{font-size:var(--fs-display);font-weight:var(--weight-display);line-height:1.12;letter-spacing:var(--tracking-display);margin:0 0 24px}
h2{font-size:var(--fs-h2);line-height:1.25;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--fs-h3);line-height:1.4;margin:0 0 12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.no-break{white-space:nowrap}
.skip{position:absolute;left:-9999px;top:8px;z-index:100;padding:8px 14px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-small)}
.skip:focus{left:16px}
.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;gap:24px}
.grid>*{min-width:0}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.stack{display:grid;grid-template-columns:minmax(0,1fr);gap:24px}
.flow>*+*{margin-top:20px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.prose{max-width:880px;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol{margin-bottom:20px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:26px}
.prose li+li{margin-top:8px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px;color:var(--accent)}
code{font-family:var(--font-mono);overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);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-md)}
pre code{padding:0;white-space:pre;overflow-wrap:normal}
.decorated{position:relative;overflow-x:clip;max-width:100%}
.panel,.surface-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-xl);box-shadow:var(--shadow-card)}
.panel{padding:28px}
.surface-card{padding:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:50px;padding:0 22px 0 26px;border:1px solid var(--clear);border-radius:var(--r-pill);font-size:var(--fs-body);font-weight:var(--weight-bold);letter-spacing:-.005em;white-space:nowrap;flex-shrink:0}
.btn svg{width:14px;height:14px}
.btn-primary{background:var(--accent);color:var(--panel);box-shadow:var(--shadow-cta)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-secondary{background:color-mix(in srgb,var(--border) 62%,var(--panel-2));color:var(--text)}
.btn-secondary:hover,.btn-secondary.is-hover{background:var(--border)}
.btn-outline{border-color:var(--accent);background:var(--panel);color:var(--accent)}
.btn:active{box-shadow:var(--shadow-card)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;border-color:var(--border)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.site-header{position:relative;z-index:30;height:var(--header-height);background:color-mix(in srgb,var(--panel) 86%,var(--clear));border-bottom:1px solid var(--border)}
.header-row{display:flex;flex-wrap:nowrap;align-items:center;height:100%;gap:40px}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);flex:none}
.brand-mark{width:32px;height:32px;flex:none}
.brand-en{font-size:20px;font-weight:var(--weight-display);letter-spacing:-.02em;color:var(--text)}
.brand-zh{font-size:var(--fs-small);font-weight:500;color:var(--muted);padding-left:10px;border-left:1px solid var(--border);line-height:16px}
.nav{display:flex;align-items:center;flex:1;min-width:0;font-size:15px;font-weight:var(--weight-medium)}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-link,.nav-more-btn{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 14px;border-radius:var(--r-pill);color:var(--text);white-space:nowrap}
.nav-link:hover,.nav-more-btn:hover{background:color-mix(in srgb,var(--panel-2) 70%,var(--clear))}
.nav-link[aria-current="page"],.menu a[aria-current="page"]{color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--panel))}
.nav-more{position:relative}
.nav-more-btn{border:0;background:none;font-weight:var(--weight-medium)}
.caret{width:12px;height:12px;flex:none}
.menu{position:absolute;top:calc(100% + 10px);left:0;z-index:42;min-width:220px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-float)}
.menu-label{padding:8px 12px 2px;font-size:var(--fs-caption);font-weight:var(--weight-medium);letter-spacing:.06em;color:var(--muted)}
.menu a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-small);font-weight:var(--weight-medium)}
.menu a:hover{background:color-mix(in srgb,var(--accent) 7%,var(--panel));color:var(--accent)}
.header-end{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-control{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;border:0;border-radius:var(--r-pill);background:none;color:var(--muted);font-size:var(--fs-small);font-weight:500;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:color-mix(in srgb,var(--panel-2) 70%,var(--clear));color:var(--text)}
.globe{width:16px;height:16px}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:45;width:190px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-float)}
.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"]{color:var(--accent);background:var(--lilac)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;padding:0 18px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-small);font-weight:var(--weight-bold);box-shadow:var(--shadow-card);white-space:nowrap}
.btn-login:hover{background:var(--accent-dark)}
.btn-login svg{width:12px;height:12px}
.burger{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border:0;background:var(--clear);border-radius:var(--r-sm)}
.burger-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none;position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:29;background:var(--panel);padding:16px var(--gutter) 32px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);font-weight:var(--weight-medium)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--lilac);color:var(--accent)}
.drawer-label{margin-top:16px;padding:12px 16px 6px;font-size:var(--fs-caption);font-weight:var(--weight-bold);color:var(--muted);border-top:1px solid var(--border)}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-intro{max-width:360px;color:var(--muted);margin-top:16px}
.footer-title{font-size:var(--fs-small);font-weight:var(--weight-bold);color:var(--text);margin-bottom:12px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:var(--fs-small)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages [aria-current="true"]{color:var(--accent);font-weight:var(--weight-bold)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;color:var(--muted);font-size:var(--fs-small)}
.footer-legal{display:flex;gap:24px}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.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:1240px){.header-row{gap:24px}.nav-link,.nav-more-btn{padding-inline:12px}}
@media(max-width:1024px){.header-row{gap:20px}.brand-zh{display:none}.grid-5{grid-template-columns:repeat(3,minmax(0,1fr))}.footer-grid{gap:24px}}
@media(max-width:900px){.nav{display:none}.burger{display:flex}.header-end{margin-left:auto}.mobile-drawer:not([hidden]){display:block}.header-row{gap:16px}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid> :first-child{grid-column:1/-1}}
@media(max-width:768px){:root{--fs-display:40px;--fs-h2:28px;--section-space:56px;--gutter:24px}.grid-3{grid-template-columns:1fr}.grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}h1{line-height:1.15}}
@media(max-width:640px){:root{--gutter:16px}.no-break{white-space:normal}.tilt{transform:none}.decorated{max-width:100%;overflow-x:clip}.header-row{gap:8px}.header-end{gap:4px;margin-left:auto}.brand{gap:7px}.brand-en{font-size:18px}.brand-mark{width:28px;height:28px}.lang{padding-inline:7px;font-size:var(--fs-caption)}.lang .globe,.lang .caret{display:none}.btn-login{padding-inline:12px;font-size:var(--fs-caption)}.footer-grid{grid-template-columns:1fr}.footer-grid> :first-child{grid-column:auto}.panel{padding:20px}.prose{max-width:100%}}
@media(max-width:359px){.brand-en{font-size:16px}.brand-mark{width:24px;height:24px}.brand{gap:5px}.lang{padding-inline:4px}.btn-login{padding-inline:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}}