:root{
  color-scheme:light;
  --bg:#F7F6F9;--bg-top:#FBFAFD;--panel:#FFFFFF;--panel-2:#EFECF4;--border:#DFDAE8;
  --accent:#EC3FA0;--accent-dark:#B8247A;--text:#1C1626;--ink-hover:#30263F;--muted:#625A70;--muted-2:#8D86A0;
  --success:#5DAE1E;--warn:#C9800A;--error:#D6303F;--white:#FFFFFF;
  --violet:#7A5CF0;--violet-deep:#5E45D2;--lilac:#C9A6F5;--lilac-2:#B391EE;
  --lavender:#ECE6F7;--lavender-mark:#E3D9F7;--lavender-glow:#E6DDF6;--lavender-glow-0:rgba(230,221,246,0);
  --lime:#C8EE8A;--star:#C5B6EC;--track:#8E84A6;
  --line-pink:#F2A1CF;--line-lime:#A9D65E;--line-violet:#B4A3F3;
  --beam-pink-a:rgba(236,63,160,.18);--beam-pink-b:rgba(236,63,160,.05);--beam-lime-a:rgba(200,238,138,.78);--beam-lime-b:rgba(200,238,138,.14);
  --lane:rgba(255,255,255,.55);--glint:rgba(255,255,255,.9);--glint-0:rgba(255,255,255,0);--topbar-bg:rgba(251,250,253,.86);
  --shadow-lift:0 24px 48px -20px rgba(236,63,160,.10),0 14px 34px -14px rgba(122,92,240,.12),0 1px 2px rgba(28,22,38,.06);
  --shadow-float:0 12px 26px -10px rgba(236,63,160,.14),0 2px 6px rgba(28,22,38,.06);
  --shadow-soft:0 6px 18px -8px rgba(122,92,240,.16);
  --clip-shadow:rgba(236,63,160,.12);--clip-shadow-near:rgba(94,69,210,.16);--knob-shadow:rgba(28,22,38,.25);
  --veil:rgba(28,22,38,.28);--flag-red:#D7263D;--flag-navy:#1E2A66;--flag-frame:rgba(28,22,38,.14);
  --clear:transparent;
  --r-card:6px;--r-btn:4px;--r-pill:999px;--r-chrome:5px;--r-dot:50%;--r-star:1px;
  --grain:.04;
  --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,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --text-xs:12px;--text-sm:14px;--text-base:16px;--text-lead:20px;--h1:clamp(52px,5.4vw,68px);--h2:clamp(28px,3vw,40px);--h3:22px;
  --gutter:32px;--wrap:1280px;--reading:820px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:48px;--space-6:64px;--space-7:88px;
  --ease:ease;--fast:.2s;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:400 var(--text-base)/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;z-index:60;pointer-events:none;opacity:var(--grain);mix-blend-mode:multiply;background-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='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath filter='url(%23n)' d='M0 0h160v160H0z'/%3E%3C/svg%3E")}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img,svg{vertical-align:middle;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
h1,h2,h3,h4,p{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--h1);font-weight:900;line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--h2);font-weight:800;line-height:1.2;letter-spacing:-.02em}
h3{font-size:var(--h3);font-weight:750;line-height:1.35}
ul,ol{padding-left:1.5em}
:focus-visible{outline:2px solid var(--violet);outline-offset:3px}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--space-6);padding-bottom:var(--space-6)}
.stack{display:grid;gap:var(--space-3)}
.stack>*{min-width:0}
.grid{display:grid;gap:var(--space-3)}
.grid>*{min-width:0}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--five{grid-template-columns:repeat(5,minmax(0,1fr))}
.section-head{margin-bottom:var(--space-4)}
.section-head p{max-width:70ch;margin-top:var(--space-2);color:var(--muted)}
.kicker{font:500 var(--text-xs)/1.6 var(--font-mono);color:var(--violet);letter-spacing:.06em}
.muted{color:var(--muted)}
.text-link{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose{overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose blockquote,.prose pre{margin-top:var(--space-2);margin-bottom:var(--space-3)}
.prose h2{margin-top:var(--space-6);margin-bottom:var(--space-3)}
.prose h3{margin-top:var(--space-4);margin-bottom:var(--space-2)}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-card)}
pre code{white-space:pre;overflow-wrap:normal}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 26px;border:1.5px solid var(--text);border-radius:var(--r-btn);font-size:var(--text-base);font-weight:700;line-height:1.4;letter-spacing:.01em;transition:background var(--fast) var(--ease),color var(--fast) var(--ease);white-space:nowrap;flex-shrink:0}
.btn svg{display:block;flex:none;transition:transform var(--fast) var(--ease)}
.btn:hover svg{transform:translateX(3px)}
.btn-primary{background:var(--text);color:var(--white)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--ink-hover)}
.btn-ghost,.btn-secondary{background:var(--clear);color:var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);border-color:var(--border);color:var(--muted)}
.btn-small{min-height:36px;padding:8px 16px;font-size:var(--text-sm)}
.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-lift);min-width:0}
.card--pink{border-color:var(--line-pink)}
.card--lime{border-color:var(--line-lime)}
.card--violet{border-color:var(--line-violet)}
.panel{padding:var(--space-3);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-card);min-width:0}
.badge,.tag{display:inline-flex;align-items:center;gap:var(--space-1);max-width:100%;min-height:24px;padding:2px 9px;border:1px solid var(--border);border-radius:var(--r-btn);font-size:var(--text-xs);font-weight:600;background:var(--panel);color:var(--muted);overflow-wrap:anywhere}
.tag{background:var(--panel-2)}
.badge-dot,.sdot{display:inline-block;width:8px;height:8px;border-radius:var(--r-dot);flex-shrink:0}
.badge-dot,.sdot--ok,.sdot--direct{background:var(--success);box-shadow:0 0 0 3px color-mix(in srgb,var(--success) 20%,var(--clear))}
.sdot--iepl{background:var(--violet);box-shadow:0 0 0 3px color-mix(in srgb,var(--violet) 18%,var(--clear))}
.sdot--relay{background:var(--line-pink);box-shadow:0 0 0 3px color-mix(in srgb,var(--line-pink) 30%,var(--clear))}
.sdot--lime{background:var(--line-lime)}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;overflow:hidden;max-width:100%;margin-block:var(--space-3) var(--space-4)}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:var(--space-3)}
#site-header{position:sticky;top:0;z-index:50;min-height:var(--header-height)}
.topbar{position:relative;z-index:50;background:var(--topbar-bg);backdrop-filter:saturate(1.2) blur(10px);-webkit-backdrop-filter:saturate(1.2) blur(10px);border-bottom:1px solid var(--border)}
.topbar-inner{max-width:var(--wrap);height:var(--header-height);margin:0 auto;padding:0 var(--gutter);display:flex;align-items:center;gap:28px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-height:32px}
.brand-mark{display:block;flex:none;width:30px;height:32px}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.brand-zh{font-size:13.5px;font-weight:500;color:var(--muted);line-height:1;padding-left:10px;border-left:1px solid var(--border)}
.tabs{flex:1;min-width:0;display:flex;align-items:center;justify-content:center;gap:4px}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:0;min-width:0;overflow:hidden}
.tabs li{flex:none}
.nav-more{position:relative;flex:none}
.nav-more-toggle{display:flex;align-items:center;gap:4px;min-height:44px;padding:0 8px;border:0;background:transparent;font:inherit;font-size:13px;color:var(--muted);cursor:pointer;white-space:nowrap}
.nav-more-toggle::after{content:"⌄"}
.nav-more-panel{position:absolute;top:100%;right:0;min-width:190px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-lift)}
.nav-more-panel a{height:auto;min-height:44px;padding:8px 12px}
.nav-more-panel a::after{display:none}
.tabs a{position:relative;display:flex;align-items:center;height:var(--header-height);padding:0 8px;font-size:14px;font-weight:500;color:var(--muted);white-space:nowrap;transition:color var(--fast) var(--ease)}
.tabs a::after{content:"";position:absolute;left:12px;right:12px;bottom:0;height:2px;background:var(--text);transform:scaleX(0);transform-origin:left center;transition:transform .25s var(--ease),opacity .25s var(--ease);opacity:.3}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{transform:scaleX(1)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:700}
.tabs a[aria-current="page"]::after{transform:scaleX(1);opacity:1}
.topbar-end{display:flex;align-items:center;gap:12px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 10px;border:0;border-radius:var(--r-btn);background:var(--clear);color:var(--muted);font:500 13.5px/1 var(--font-body);cursor:pointer}
.lang-text{white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:80;width:190px;padding:8px;background:var(--panel);border:1px solid var(--line-violet);border-radius:var(--r-card);box-shadow:var(--shadow-lift)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-btn);font-size:var(--text-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border:1.5px solid var(--text);border-radius:var(--r-btn);font-size:var(--text-sm);font-weight:700;white-space:nowrap;transition:background var(--fast) var(--ease),color var(--fast) var(--ease)}
.btn-login:hover{background:var(--text);color:var(--white)}
.menu-button{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.nav-drawer{display:none;position:fixed;top:var(--header-height);right:0;left:0;z-index:48;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)}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-bottom:1px solid var(--border);font-weight:500}
.nav-drawer a[aria-current="page"]{background:var(--panel-2);box-shadow:inset 3px 0 var(--accent)}
.drawer-languages{margin-top:var(--space-3);border-top:1px solid var(--line-violet)}
.drawer-languages a{font-size:var(--text-sm)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:47;background:var(--veil);border:0;padding:0}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:var(--space-5);padding-bottom:var(--space-3)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:var(--space-5)}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:38ch;margin-top:var(--space-2);color:var(--muted);font-size:var(--text-sm)}
.footer-title{font-size:var(--text-sm);font-weight:700;margin-bottom:var(--space-2)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm);color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages,.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-bottom{margin-top:var(--space-4);padding-top:var(--space-3);border-top:1px solid var(--border);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--space-2);font:400 var(--text-xs)/1.6 var(--font-mono);color:var(--muted)}
.footer-languages{margin-top:var(--space-4)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
@media(max-width:1180px){
  .topbar-inner{gap:16px}
  .tabs a{padding-inline:9px;font-size:13px}
}
@media(max-width:1040px){
  .tabs{display:none}
  .topbar-end{margin-left:auto}
  .menu-button{display:inline-flex}
  .nav-drawer:not([hidden]){display:block}
}
@media(min-width:1041px){
  .nav-drawer,.nav-veil{display:none!important}
  html.nav-open{overflow:auto}
}
@media(max-width:768px){
  :root{--gutter:24px;--h1:38px;--space-6:48px;--space-7:64px}
  .grid--three{grid-template-columns:1fr}
  .grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:var(--space-4)}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px;--h1:36px}
  .no-break{white-space:normal}
  .tilt{transform:none}
  .topbar-inner{gap:12px}
  .topbar-end{margin-left:auto;gap:6px}
  .brand-zh,.lang-text{display:none}
  .brand-en{font-size:17px}
  .brand{gap:7px}
  .brand-mark{width:26px;height:28px}
  .btn-login{padding-inline:12px}
  .lang{padding-inline:8px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@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}
}