:root {
  --bg:#FBFAFD;
  --panel:#FFFFFF;
  --panel-2:#F3F1F8;
  --border:#E4E0EE;
  --border-strong:#D3CDE2;
  --accent:#6C2BD9;
  --accent-dark:#4A1AA3;
  --ice:#3A4FE0;
  --text:#1B1730;
  --muted:#5E5873;
  --success:#1FA65A;
  --warn:#E8841A;
  --error:#D93A4C;
  --white:#FFFFFF;
  --ink:#1B1730;
  --ink-soft:#2E2747;
  --on-dark:#A39CBC;
  --mark:#2A2540;
  --accent-tint:#F1EAFD;
  --success-tint:#E7F6ED;
  --success-line:#C4E8D2;
  --success-deep:#137A41;
  --warn-tint:#FDF1E3;
  --warn-line:#F6D6B0;
  --warn-deep:#9C520B;
  --error-tint:#FCECEF;
  --bubble-line:#E3D2F7;
  --hx-a1:#6C2BD9;
  --hx-a2:#9B70EA;
  --hx-a3:#D4C2F6;
  --hx-b1:#3A4FE0;
  --hx-b2:#7B8BEE;
  --hx-b3:#C4CCF8;
  --hx-n:#E7E3F0;
  --flag-red:#C8102E;
  --flag-blue:#1F2F7A;
  --flag-green:#12854A;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(27,23,48,.16);
  --on-accent:#FFFFFF;
  --on-accent-2:rgba(255,255,255,.80);
  --on-accent-line:rgba(255,255,255,.24);
  --hl:rgba(255,255,255,.95);
  --clear:transparent;
  --veil-color:rgba(27,23,48,.32);
  --grad-brand:linear-gradient(100deg,var(--accent) 0%,var(--ice) 100%);
  --grad-notice:linear-gradient(90deg,var(--accent-dark) 0%,var(--accent) 36%,var(--ice) 100%);
  --grad-fact:linear-gradient(135deg,var(--accent) 0%,var(--ice) 100%);
  --grad-sheen:linear-gradient(100deg,rgba(255,255,255,0) 0%,rgba(255,255,255,.16) 50%,rgba(255,255,255,0) 100%);
  --grad-bubble:linear-gradient(100deg,#F7E6FB 0%,#EEE7FD 55%,#E7ECFD 100%);
  --grad-pack:linear-gradient(180deg,#FFFFFF 0%,#F6F2FD 100%);
  --grad-chrome:linear-gradient(180deg,var(--panel),var(--panel-2));
  --atmo:linear-gradient(180deg,rgba(108,43,217,.06) 0%,rgba(58,79,224,.045) 40%,rgba(251,250,253,0) 82%);
  --glow:radial-gradient(closest-side,rgba(108,43,217,.22) 0%,rgba(58,79,224,.12) 55%,rgba(58,79,224,0) 100%);
  --gloss:radial-gradient(120% 100% at 100% 0%,rgba(108,43,217,.14) 0%,rgba(58,79,224,.07) 38%,rgba(58,79,224,0) 70%);
  --rim:linear-gradient(90deg,rgba(108,43,217,0) 0%,rgba(108,43,217,.5) 60%,rgba(58,79,224,.75) 100%);
  --fact-sheen:radial-gradient(circle at 100% 0%,rgba(255,255,255,.26),rgba(255,255,255,0) 60%);
  --shadow-window:0 48px 96px -24px rgba(108,43,217,.14),0 26px 50px -30px rgba(58,79,224,.20),0 1px 2px rgba(27,23,48,.06);
  --shadow-mod:0 6px 14px -10px rgba(108,43,217,.18);
  --shadow-fact:0 12px 24px -12px rgba(108,43,217,.50),inset 0 1px 0 rgba(255,255,255,.28);
  --shadow-cta:0 14px 30px -12px rgba(108,43,217,.55),inset 0 1px 0 rgba(255,255,255,.28);
  --shadow-chip:0 6px 16px -10px rgba(108,43,217,.22);
  --shadow-float:0 18px 38px -14px rgba(108,43,217,.26),0 2px 6px rgba(74,26,163,.08);
  --shadow-bubble:0 16px 32px -14px rgba(155,112,234,.45),0 2px 6px rgba(74,26,163,.08);
  --shadow-nav:0 1px 0 rgba(228,224,238,1),0 8px 24px -18px rgba(74,26,163,.18);
  --focus:0 0 0 3px rgba(108,43,217,.28);
  --r-xs:4px;
  --r-sm:6px;
  --r-md:8px;
  --r-icon:7px;
  --r-pill:999px;
  --r-circle:50%;
  --r-flat:0;
  --font-display:"Inter","Noto Sans SC","PingFang SC","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-body:16px;
  --fs-lead:17px;
  --fs-small:14px;
  --fs-micro:12px;
  --fs-h1:clamp(52px,5vw,68px);
  --fs-h2:clamp(26px,3vw,36px);
  --fs-h3:22px;
  --weight-body:400;
  --weight-medium:500;
  --weight-bold:700;
  --weight-display:900;
  --lh-body:1.6;
  --lh-heading:1.18;
  --tracking-display:-.03em;
  --gutter:32px;
  --content-width:1200px;
  --reading-width:820px;
  --section-space:72px;
  --header-height:94px;
  --anchor-offset:110px;
  --toc-offset:80px;
  --motion-fast:.15s;
  --motion-ui:.2s;
  --motion-reveal:.35s;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html,body{margin:0}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:var(--lh-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{max-width:100%;height:auto;display:block}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:var(--accent-tint)}
a{color:inherit;text-decoration:none}
button{color:inherit}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
h1,h2,h3{font-family:var(--font-display);line-height:var(--lh-heading);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:var(--weight-display);letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--fs-h2);font-weight:800;letter-spacing:-.02em;margin:0 0 20px}
h3{font-size:var(--fs-h3);font-weight:var(--weight-bold);margin:0 0 16px}
p{margin:0 0 20px}
figure{margin:0}
ul,ol{padding-left:24px}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em;background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{overflow-x:auto;max-width:100%;padding:20px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre;padding:0}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.grid{display:grid;gap:24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>* , .wrap>* , .reading-wrap>*{min-width:0}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-mod);padding:24px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.icon{width:20px;height:20px;display:inline-block;vertical-align:middle}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 26px;border-radius:var(--r-sm);font-weight:700;font-size:16px;letter-spacing:.01em;flex-shrink:0;white-space:nowrap;border:1.5px solid var(--clear);transition:background var(--motion-fast),box-shadow var(--motion-fast)}
.btn svg{width:16px;height:16px}
.btn-main,.btn-primary{position:relative;isolation:isolate;overflow:hidden;background:var(--grad-brand);color:var(--on-accent);box-shadow:var(--shadow-cta)}
.btn-main::after,.btn-primary::after{content:"";position:absolute;inset:0;background:var(--grad-sheen);opacity:0;transition:opacity var(--motion-ui);z-index:-1}
.btn-main:hover::after,.btn-primary:hover::after{opacity:1}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--accent-dark);border-color:var(--accent)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--accent-tint)}
.btn-small{height:40px;padding-inline:18px;font-size:var(--fs-small)}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.notice{background:var(--grad-notice);color:var(--on-accent);text-align:center;font-size:13px;font-weight:600;line-height:18px;padding:8px 16px;letter-spacing:.02em}
.notice-dot{display:inline-block;margin:0 10px;opacity:.7}
.top{position:relative;z-index:50;background:var(--panel);box-shadow:var(--shadow-nav)}
.top-in{max-width:1200px;margin:0 auto;padding:0 var(--gutter);height:60px;display:flex;align-items:center;gap:32px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:18px;letter-spacing:-.01em;color:var(--text);flex:none;white-space:nowrap;min-height:30px}
.brand img{width:30px;height:30px}
.brand-zh{font-weight:500;color:var(--muted)}
.nav{display:flex;align-items:center;flex:1;min-width:0}
.nav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:26px}
.nav li{min-width:0}
.nav a{display:inline-flex;align-items:center;min-height:32px;font-size:14.5px;font-weight:500;color:var(--muted);padding:6px 0;white-space:nowrap;transition:color var(--motion-fast)}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:700}
.top-r{display:flex;align-items:center;gap:18px;flex-shrink:0;margin-left:auto}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:4px 0;font-size:14px;color:var(--muted);background:var(--clear);border:0}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:80;min-width:170px;background:var(--panel);padding:6px;border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:var(--shadow-float);list-style:none;margin:0}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-xs);white-space:nowrap;font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{color:var(--accent-dark);background:var(--accent-tint)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 18px;border:1.5px solid var(--accent);border-radius:var(--r-sm);color:var(--accent-dark);font-weight:700;font-size:14px;background:var(--panel);transition:background var(--motion-fast);white-space:nowrap}
.login:hover{background:var(--accent-tint)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);padding:10px}
.menu-line{display:block;width:20px;height:2px;background:currentColor;flex-shrink:0}
.menu-toggle[aria-expanded="true"]{color:var(--accent-dark);background:var(--accent-tint)}
.mobile-drawer{display:none}
.menu-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.footer-grid>*{min-width:0}
.footer-brand p{font-size:14px;color:var(--muted);margin-top:16px;max-width:300px}
.footer-title{font-size:14px;font-weight:700;margin:0 0 12px}
.footer-list{list-style:none;padding:0;margin:0;display:grid;gap:4px}
.footer-list a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted)}
.footer-list a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;border-top:1px solid var(--border);margin-top:32px;padding-top:20px;font-size:12px;color:var(--muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.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{display:block;position:relative;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
@media(max-width:1240px){.nav ul{gap:20px}.top-in{gap:24px}}
@media(max-width:1100px){.nav ul{gap:14px}.nav a{font-size:13px}.top-in{gap:18px}.top-r{gap:12px}}
@media(max-width:960px){
  .nav{display:none}
  .top-r{margin-left:auto;gap:12px}
  .top-in{padding-inline:20px;gap:16px}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;z-index:45;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;border-top:1px solid var(--border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer ul{list-style:none;padding:0;margin:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px;border-bottom:1px solid var(--border);font-size:16px}
  .mobile-drawer a[aria-current]{color:var(--accent-dark);font-weight:700}
  .drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
  .menu-veil{position:fixed;top:var(--header-height);right:0;bottom:0;left:0;z-index:40;background:var(--veil-color);border:0}
  .menu-veil:not([hidden]){display:block}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px;--section-space:48px;--fs-h1:38px}
  .grid{grid-template-columns:1fr}
  h1{line-height:1.15}
  .lang span{display:none}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.decorative-tilt{transform:none}
  .top-in{padding-inline:16px;gap:8px}
  .top-r{gap:6px;margin-left:auto}
  .brand{font-size:16px;gap:7px}
  .brand img{width:27px;height:27px}
  .login{padding-inline:12px}
  .footer-grid{gap:24px}
  .footer-brand{grid-column:1 / -1}
  .panel,.card{padding:20px}
  .mobile-drawer{max-width:100%}
}
@media(max-width:359px){
  .brand{font-size:14px;gap:5px}
  .brand img{width:24px;height:24px}
  .top-in{padding-inline:16px}
  .top-r{gap:3px}
  .login{padding-inline:9px}
  .notice{font-size:12px;padding-inline:8px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important}
}