:root{
  --bg:#FBFBFC;--bg-rgb:251 251 252;--bg-panel:#FFFFFF;--bg-panel-2:#EEF3FB;
  --border:#DDE3EE;--border-strong:#C3CCDC;--line-soft:#EDF0F6;
  --accent:#1A56D6;--accent-2:#4C86F0;--accent-dark:#0F3C9E;--accent-deep:#0B2E7D;--accent-rgb:26 86 214;
  --text:#0E1A33;--text-muted:#5A6478;--text-faint:#8D96A8;--ink-rgb:14 26 51;
  --on-dark:#FFFFFF;--white-rgb:255 255 255;--success:#14935B;--success-rgb:20 147 91;--warn:#C98A0B;--error:#CC3344;
  --frame:#C9D8F5;--frame-hi:#D9E5FA;--bar:#F5F8FD;--grid-rgb:52 78 138;--clear:transparent;
  --flag-white:#FFFFFF;--flag-jp:#BC002D;--flag-hk:#DE2910;--flag-us-red:#B22234;--flag-us-blue:#3C3B6E;--flag-sg:#EF3340;--flag-it-green:#009246;--flag-it-red:#CE2B37;
  --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;
  --r-xs:4px;--r-s:6px;--r-m:8px;--r-win-in:10px;--r-l:12px;--r-win:16px;--r-xl:16px;--r-mob:24px;--r-mob-in:19px;--r-pill:999px;--r-round:50%;
  --sh-head:0 1px 2px rgb(var(--accent-rgb)/.05),0 14px 36px -20px rgb(var(--accent-rgb)/.26);
  --sh-chip:0 1px 2px rgb(var(--accent-rgb)/.07);
  --sh-panel:inset 0 1px 0 var(--bg-panel),0 18px 48px -24px rgb(var(--accent-rgb)/.12);
  --sh-back:0 2px 6px -2px rgb(var(--accent-rgb)/.08),0 34px 80px -30px rgb(var(--accent-rgb)/.24);
  --sh-mid:0 4px 10px -4px rgb(var(--accent-rgb)/.12),0 34px 64px -24px rgb(var(--accent-rgb)/.30);
  --sh-front:0 6px 14px -6px rgb(var(--accent-rgb)/.16),0 36px 60px -20px rgb(var(--accent-rgb)/.36);
  --sh-float:0 2px 4px rgb(var(--accent-rgb)/.06),0 14px 30px -14px rgb(var(--accent-rgb)/.34);
  --gutter:24px;--content-width:1168px;--menu-top:102px;--toc-top:16px;--anchor-offset:96px;
  --size-body:16px;--size-small:14px;--size-h1:clamp(52px,4.5vw,68px);--size-h2:clamp(28px,3vw,40px);--size-h3:22px;
  --weight-body:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-display:800;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;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;text-rendering:optimizeLegibility}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
a,button,summary{touch-action:manipulation}
button{border:0}
ul{padding-left:1.4em}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-bold);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--size-h2);letter-spacing:-.015em}
h3{font-size:var(--size-h3)}
p{margin:0 0 1em}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-s)}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.no-break{white-space:nowrap}
.mono,code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em;background:var(--bg-panel-2);border-radius:var(--r-xs);padding:.12em .3em}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-m);background:var(--bar)}
pre code{padding:0;background:var(--clear);overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head h2{margin:8px 0 16px}
.section-head p,.muted{color:var(--text-muted)}
.prose{max-width:800px;margin-inline:auto;overflow-wrap:break-word}
.prose h2{margin-top:1.8em}
.prose h3{margin-top:1.6em}
.prose p,.prose li{line-height:1.85}
.prose a{text-decoration:underline}
.prose>*,.grid>*,.panel>*,.head-card>*{min-width:0}
.grid{display:grid;gap:24px}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-l);box-shadow:var(--sh-panel)}
.card{padding:24px}
.icon-tile{display:inline-grid;place-items:center;width:48px;height:48px;background:var(--bg-panel-2);color:var(--accent);border-radius:var(--r-s);flex-shrink:0}
.icon-tile svg{width:26px;height:26px}
.ic{fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.btn,.btn-solid,.btn-outline,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 30px;border-radius:var(--r-pill);font-size:var(--size-body);font-weight:var(--weight-semibold);letter-spacing:.02em;white-space:nowrap;flex-shrink:0;transition:transform .18s ease,box-shadow .18s ease}
.btn-solid,.btn-primary{background:linear-gradient(135deg,var(--accent) 0%,var(--accent) 35%,var(--accent-2) 100%);color:var(--on-dark);box-shadow:inset 0 1px 0 rgb(var(--white-rgb)/.22),0 10px 22px -10px rgb(var(--accent-rgb)/.6)}
.btn-outline,.btn-secondary{background:var(--bg-panel);color:var(--accent-dark);box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn:hover,.btn-solid:hover,.btn-outline:hover,.btn-primary:hover,.btn-secondary:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active,.btn-solid:active,.btn-outline:active{transform:translateY(0)}
.btn:disabled,.btn-solid:disabled,.btn-outline:disabled,.btn[aria-disabled="true"]{opacity:.5;transform:none}
.btn svg,.btn-solid svg{width:16px;height:16px}
.cta-pair{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:22px}
.notice-bar{position:relative;z-index:30;background:var(--accent-dark);color:var(--on-dark);text-align:center;font-size:var(--size-small);line-height:20px;padding:8px 24px;letter-spacing:.01em}
.notice-bar p{margin:0}
.notice-bar .num{font-family:var(--font-mono);font-weight:var(--weight-semibold)}
.notice-bar a{margin-left:14px;color:var(--on-dark);font-weight:var(--weight-medium);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;white-space:nowrap}
.notice-bar a:hover{text-decoration-thickness:2px}
.site-head{position:relative;z-index:40;padding:10px 24px 0}
.head-card{max-width:1392px;height:56px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:0 10px 0 18px;background:var(--bg-panel);border:1px solid rgb(var(--grid-rgb)/.08);border-radius:var(--r-xl);box-shadow:var(--sh-head)}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;color:var(--accent-dark)}
.brand:hover{text-decoration:none}
.brand-logo{width:30px;height:30px}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-display);font-size:20px;line-height:1;letter-spacing:-.025em;color:var(--accent-dark)}
.nav-dots{flex:1;display:flex;justify-content:center;min-width:0}
.nav-dots ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav-dots li{display:flex;align-items:center;font-size:14.5px;line-height:20px;white-space:nowrap}
.nav-dots li+li::before{content:"·";margin:0 11px;color:var(--text-faint);font-weight:var(--weight-bold);flex-shrink:0}
.nav-dots a{color:var(--text);padding:6px 2px;border-radius:var(--r-xs)}
.nav-dots a:hover,.nav-dots a[aria-current="page"]{color:var(--accent);text-decoration:none}
.nav-dots a[aria-current="page"]{font-weight:var(--weight-semibold)}
.head-tools{display:flex;align-items:center;gap:6px;flex-shrink:0;flex-wrap:nowrap}
.language-box{position:relative;flex-shrink:0}
.lang-pick{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;min-width:44px;width:auto;padding:0 12px;border:0;background:var(--clear);border-radius:var(--r-pill);font:inherit;font-size:var(--size-small);color:var(--text-muted);white-space:nowrap}
.lang-pick span{white-space:nowrap}
.lang-pick:hover{background:var(--bg-panel-2);color:var(--text)}
.lang-pick svg{width:15px;height:15px}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:168px;padding:6px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-l);box-shadow:var(--sh-mid)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;color:var(--text);border-radius:var(--r-s)}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--bg-panel-2);color:var(--accent);text-decoration:none}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--r-pill);background:var(--bg-panel-2);color:var(--accent-dark);font-size:var(--size-small);font-weight:var(--weight-semibold);white-space:nowrap;box-shadow:inset 0 0 0 1px rgb(var(--accent-rgb)/.16)}
.btn-login:hover{box-shadow:inset 0 0 0 1px rgb(var(--accent-rgb)/.42);text-decoration:none}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;background:var(--clear);color:var(--accent-dark);border-radius:var(--r-s)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{display:none}
.nav-veil{position:fixed;inset:var(--menu-top) 0 0;z-index:41;background:rgb(var(--ink-rgb)/.18)}
html.nav-open{overflow:hidden}
.site-footer{margin-top:48px;padding-top:48px;padding-bottom:24px;background:var(--bg-panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr;gap:32px}
.footer-brand p{margin-top:16px;max-width:300px;color:var(--text-muted);font-size:var(--size-small)}
.footer-column h2{font-size:var(--size-body);margin:0 0 12px}
.footer-links{display:grid;gap:4px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-muted);font-size:var(--size-small)}
.footer-links a:hover{color:var(--accent)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--border);padding-top:20px;margin-top:32px;color:var(--text-muted);font-size:var(--size-small)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px;color:var(--text-muted)}
.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-height:80px;overflow:hidden;max-width:100%;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
.decorated-section{position:relative;overflow-x:clip}
@media(min-width:1101px) and (max-width:1300px){
  .head-card{gap:16px}
  .nav-dots li{font-size:13px}
  .nav-dots li+li::before{margin:0 7px}
  .lang-pick{padding-inline:8px}
}
@media(max-width:1100px){
  .nav-dots{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--menu-top);left:0;right:0;z-index:45;height:calc(100dvh - var(--menu-top));max-height:calc(100dvh - var(--menu-top));padding:16px var(--gutter) 32px;overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);border-top:1px solid var(--border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-s);color:var(--text)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--bg-panel-2);color:var(--accent);text-decoration:none}
  .drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:12px}
}
@media(max-width:768px){
  :root{--size-h1:clamp(28px,5.2vw,40px);--gutter:20px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section{padding-top:40px;padding-bottom:40px}
}
@media(max-width:640px){
  :root{--gutter:16px;--menu-top:122px}
  .no-break{white-space:normal}
  .notice-bar{height:56px;padding:7px 16px;font-size:12px}
  .notice-bar a{margin-left:8px}
  .site-head{padding:10px 12px 0}
  .head-card{gap:8px;padding:0 5px 0 10px;flex-wrap:nowrap}
  .brand{gap:6px}
  .brand-logo{width:25px;height:25px}
  .brand-word{font-size:17px}
  .head-tools{gap:2px;margin-left:auto}
  .btn-login{padding-inline:12px;font-size:12px}
  .lang-pick{padding-inline:6px;font-size:12px;gap:3px}
  .lang-pick svg{display:none}
  .menu-toggle{min-width:44px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .tilt,.tilt-card,[data-tilt]{transform:none}
  .decorated-section{max-width:100%;overflow-x:clip}
  .card{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}