:root{
  --bg:#F9F1E5;--panel:#FFFCF7;--panel-2:#F1E5D3;--border:#E5D6C1;--border-soft:#EEE2D1;
  --accent:#E14B6A;--accent-dark:#B02F4E;--violet:#B54FD8;--lavender:#D7B7EE;
  --text:#2A1F18;--ink-2:#45352A;--muted:#6F5F52;--success:#2F9A5C;--warn:#C98A14;--error:#C2362F;--on-ink:#FFFCF7;
  --hero-top:#FCF8F0;--hero-bottom:#F3E8D7;
  --mint:#58C49B;--mint-soft:#DCF2E6;--mint-ink:#1E7651;--sky:#55A1E6;--sky-soft:#DDEBF9;--sky-ink:#1E5C98;--honey:#E7B13C;--honey-soft:#FAEDC9;--honey-ink:#835C0A;--rose-soft:#FBE1E7;
  --flag-white:#FFFFFF;--flag-hk:#DE2910;--flag-us-red:#B22234;--flag-us-blue:#3C3B6E;--flag-jp:#BC002D;--flag-sg:#EF3340;--flag-navy:#012169;--flag-uj-red:#C8102E;--flag-nl-red:#AE1C28;--flag-nl-blue:#21468B;
  --flag-edge:rgb(42 31 24 / .14);--hl:rgb(255 255 255 / .92);--gloss:rgb(255 255 255 / .45);--glow:rgb(225 75 106 / .12);--ink-sheen:rgb(255 255 255 / .16);--veil:rgb(42 31 24 / .3);--dot-paper:rgb(255 252 247 / .06);--clear:transparent;
  --lift:0 16px 40px rgb(225 75 106 / .10),0 2px 6px rgb(42 31 24 / .05);
  --lift-sm:0 8px 22px rgb(225 75 106 / .10),0 1px 3px rgb(42 31 24 / .06);
  --lift-ink:0 10px 22px -8px rgb(42 31 24 / .55);
  --switch-inset:inset 0 1px 2px rgb(42 31 24 / .18);--switch-knob:0 1px 2px rgb(42 31 24 / .25);
  --ring-grad:linear-gradient(145deg,var(--flag-white),rgb(225 75 106 / .55) 58%,rgb(181 79 216 / .45));
  --grad-accent:linear-gradient(92deg,var(--accent) 8%,var(--violet) 92%);--grad-ink:linear-gradient(180deg,var(--ink-2),var(--text));
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-card:22px;--r-mini:14px;--r-menu:20px;--r-small:12px;--r-dark:28px;--r-tip:4px;--r-pill:999px;--r-round:50%;
  --gutter:32px;--content:1280px;--header-height:72px;--anchor-space:88px;--toc-space:156px;
  --text-xs:12px;--text-sm:14px;--text-base:16px;--text-lead:20px;
  --weight-normal:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-display:800;
  --ease:ease;--fast:.18s;--reveal-time:.35s;
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%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 1.1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --grain-opacity:.04;--grain-size:180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
html,body{margin:0}
body{position:relative;background:var(--bg);color:var(--text);font:var(--weight-normal) var(--text-base)/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip}
body::before{content:"";position:fixed;inset:0;z-index:80;pointer-events:none;background-image:var(--grain);background-size:var(--grain-size) var(--grain-size);opacity:var(--grain-opacity)}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary{touch-action:manipulation}
button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
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:clamp(52px,5vw,72px);font-weight:var(--weight-display);line-height:1.1;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);font-weight:var(--weight-bold);line-height:1.25;letter-spacing:-.02em}
h3{font-size:22px;line-height:1.4;font-weight:var(--weight-bold)}
ul,ol{padding-left:1.5em}
p+ p{margin-top:16px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-mini);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{text-align:left}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.stack>*+*{margin-top:24px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);padding:28px;box-shadow:inset 0 1px 0 var(--hl),var(--lift-sm);min-width:0}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.grad{display:inline-block;background:var(--grad-accent);background-clip:text;-webkit-background-clip:text;color:var(--clear);-webkit-text-fill-color:var(--clear)}
.ln{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.skip{position:absolute;left:16px;top:-64px;z-index:100;padding:10px 16px;border-radius:var(--r-pill);background:var(--text);color:var(--on-ink);text-decoration:none;font-size:var(--text-sm)}
.skip:focus{top:12px}
.btn,.btn-line,.login,.signup-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:11px 22px;border-radius:var(--r-pill);font-weight:var(--weight-semibold);text-decoration:none;white-space:nowrap;flex-shrink:0;border:1px solid var(--text);transition:background-color var(--fast) var(--ease),color var(--fast) var(--ease),transform var(--fast) var(--ease)}
.btn-primary,.signup-btn{background:var(--grad-ink);color:var(--on-ink);box-shadow:inset 0 1px 0 var(--ink-sheen),var(--lift-ink)}
.btn-secondary,.btn-line{background:var(--clear);color:var(--text)}
.btn:hover,.btn-line:hover{transform:translateY(-2px)}
.btn-secondary:hover,.btn-line:hover{background:var(--panel)}
.btn svg{width:18px;height:18px}
.btn[aria-disabled="true"]{pointer-events:none}
.topbar{position:relative;z-index:60;background:var(--hero-top)}
.topbar-in{max-width:var(--content);height:var(--header-height);margin:0 auto;padding:0 var(--gutter);display:flex;align-items:center;gap:40px;flex-wrap:nowrap}
.brandmark{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;font-family:var(--font-display);font-weight:var(--weight-display);font-size:21px;letter-spacing:-.02em;color:var(--text)}
.brandmark img{width:30px;height:30px;flex-shrink:0}
.brand-zh{font-weight:var(--weight-medium);color:var(--muted)}
.desktop-nav{flex:1;min-width:0}
.navlist{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.navlink{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;padding:0 14px;border:0;border-radius:var(--r-pill);background:var(--clear);cursor:pointer;font:var(--weight-medium) 15px/1 var(--font-body);color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--fast) var(--ease),background-color var(--fast) var(--ease)}
.navlink:hover{color:var(--text);background:var(--panel-2)}
.navlink[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold)}
.navlink[aria-current="page"]::after{content:"";position:absolute;left:50%;bottom:3px;width:5px;height:5px;margin-left:-2.5px;border-radius:var(--r-round);background:var(--accent)}
.caret{font-size:11px;color:var(--muted)}
.navmore{position:relative}
.navmore>summary{list-style:none}
.navmore>summary::-webkit-details-marker{display:none}
.navmore-menu{position:absolute;top:calc(100% + 10px);left:-12px;width:300px;max-width:calc(100vw - 32px);padding:8px;border-radius:var(--r-menu);background:var(--panel);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hl),var(--lift);z-index:65;display:none}
.navmore[open] .navmore-menu{display:block}
.menu-group+.menu-group{border-top:1px solid var(--border-soft);margin-top:6px;padding-top:6px}
.menu-cap{display:block;padding:10px 12px 6px;font:var(--weight-medium) 11px/1 var(--font-mono);letter-spacing:.08em;color:var(--muted)}
.menu-item{display:flex;flex-direction:column;gap:2px;padding:9px 12px;border-radius:var(--r-small);text-decoration:none;min-height:44px}
.menu-item:hover{background:var(--panel-2)}
.menu-item b{font-size:var(--text-sm);font-weight:var(--weight-semibold);color:var(--text)}
.menu-item span{font-size:var(--text-xs);color:var(--muted)}
.topbar-end{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang{position:relative}
.lang-button{width:auto;min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 10px;border:0;border-radius:var(--r-pill);background:var(--clear);font-size:var(--text-sm);white-space:nowrap}
.lang-button:hover{background:var(--panel-2)}
.lang-button svg{width:16px;height:16px}
.lang-text{white-space:nowrap}
.lang-panel{position:absolute;top:calc(100% + 8px);right:0;z-index:70;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-menu);box-shadow:var(--lift)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-small);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.login{min-height:40px;padding:8px 22px;border-width:1.5px;background:var(--panel);color:var(--text);font-size:15px}
.login:hover{background:var(--text);color:var(--on-ink)}
.nav-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:4px;padding:10px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel);color:var(--text)}
.burger-line{display:block;width:20px;height:2px;background:currentColor}
.nav-drawer{display:none;position:fixed;top:var(--header-height);right:0;z-index:55;width:min(360px,100%);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:20px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain;border-left:1px solid var(--border)}
.nav-drawer a{display:flex;align-items:center;min-height:44px;width:100%;padding:12px 16px;text-decoration:none;border-radius:var(--r-small)}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:50;background:var(--veil);border:0;width:100%;height:calc(100dvh - var(--header-height))}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;margin-top:16px;color:var(--muted)}
.footer-heading{font-size:var(--text-sm);font-weight:var(--weight-bold);margin-bottom:12px}
.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px 16px}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none;font-size:var(--text-sm)}
.footer-links a:hover{text-decoration:underline;color:var(--accent-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border);font-size:var(--text-sm);color:var(--muted)}
.prose{max-width:800px;min-width:0;margin-inline:auto;overflow-wrap:break-word;line-height:1.85}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:28px;margin-bottom:12px}
.prose ul,.prose ol{margin-block:20px}
.prose li+li{margin-top:8px}
.prose a{color:var(--accent-dark)}
.prose section{min-width:0}
.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:100px;max-width:100%;min-width:0;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
@media(max-width:1100px){.topbar-in{gap:20px}.navlink{padding-inline:10px}}
@media(max-width:960px){
  .desktop-nav{display:none}.nav-toggle{display:inline-flex}.topbar-end{margin-left:auto}.topbar-in{gap:16px}
  .nav-open .nav-drawer,.nav-open .nav-veil{display:block}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px}
  h1{font-size:clamp(28px,8.6vw,40px)}
  .sec{padding-top:48px;padding-bottom:48px}
  .grid-three{grid-template-columns:1fr}
  .lang-text{display:none}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.bubble,.mini{transform:none}
  .panel,.card{padding:22px}
  .topbar-in{gap:8px}.brandmark{gap:6px;font-size:18px}.brandmark img{width:26px;height:26px}
  .topbar-end{gap:4px;margin-left:auto}.login{padding-inline:14px;font-size:var(--text-sm)}
  .lang-button{padding-inline:8px}.brand-zh{font-size:var(--text-xs)}
  .grid-five{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .footer-bottom{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}