:root{
  --color-bg:#E0EAF6;
  --color-bg-top:#E8F0FA;
  --color-panel:#F7FAFE;
  --color-panel-deep:#D3E0F0;
  --color-border:#C3D3E8;
  --color-border-soft:rgba(195,211,232,.7);
  --color-accent:#3DB54A;
  --color-accent-dark:#2A8A38;
  --color-accent-light:#6ED47A;
  --color-text:#10203A;
  --color-muted:#52627E;
  --color-success:#2A8A38;
  --color-warning:#D98A0B;
  --color-error:#D8434E;
  --color-lavender:#DCD6FF;
  --color-mint:#C9F2D3;
  --color-butter:#FFE7A3;
  --color-sky:#C6E1FF;
  --color-white:#FFFFFF;
  --color-shadow-accent:rgba(61,181,74,.12);
  --color-shadow-soft:rgba(61,181,74,.10);
  --color-shadow-ink:rgba(16,32,58,.06);
  --color-highlight:rgba(255,255,255,.92);
  --color-grid:rgba(195,211,232,.35);
  --color-glow-green:rgba(61,181,74,.06);
  --color-glow-sky:rgba(120,175,240,.10);
  --color-overlay:rgba(16,32,58,.38);
  --color-footer:#10203A;
  --color-footer-text:#F7FAFE;
  --color-footer-muted:#C3D3E8;
  --color-code:#D3E0F0;
  --color-focus:#2A8A38;
  --flag-hk:#DE2910;
  --flag-jp:#BC002D;
  --flag-us-red:#B22234;
  --flag-us-blue:#3C3B6E;
  --flag-sg:#EF3340;
  --flag-ch:#E8002D;
  --flag-de-black:#1B1B1B;
  --flag-de-red:#DD0000;
  --flag-de-gold:#FFCE00;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,monospace;
  --radius-xl:28px;
  --radius-lg:24px;
  --radius-md:18px;
  --radius-sm:10px;
  --radius-pill:999px;
  --shadow-panel:0 18px 42px var(--color-shadow-accent),0 3px 8px var(--color-shadow-ink),inset 0 1px 0 var(--color-highlight);
  --shadow-small:0 10px 24px var(--color-shadow-soft),0 2px 5px var(--color-shadow-ink),inset 0 1px 0 var(--color-highlight);
  --content-max:1360px;
  --reading-max:820px;
  --gutter:clamp(16px,3vw,40px);
  --header-height:72px;
  --section-space:clamp(64px,8vw,112px);
  --focus-ring:2px solid var(--color-focus);
}
*,*::before,*::after{box-sizing:border-box}
html{margin:0;scroll-behavior:smooth;scroll-padding-top:88px}
html.nav-open{overflow:hidden}
body{margin:0;min-width:320px;background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:clip}
img,svg,video{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit}
button{color:inherit}
a{color:inherit;text-decoration:none}
p{margin:0 0 1.25em}
ul,ol{margin:0;padding:0}
nav ul{list-style:none}
h1,h2,h3,h4{margin:0;color:var(--color-text);font-family:var(--font-display);text-wrap:balance}
h1,.hero-title{font-size:clamp(52px,5vw,68px);font-weight:800;line-height:1.14;letter-spacing:-.03em}
h2{font-size:clamp(34px,4vw,52px);font-weight:800;line-height:1.16;letter-spacing:-.02em}
h3{font-size:clamp(22px,2.2vw,30px);font-weight:750;line-height:1.25;letter-spacing:-.015em}
h4{font-size:19px;line-height:1.35}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;padding:20px;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-code);overflow-x:auto;white-space:pre}
table{border-collapse:collapse}
summary{cursor:pointer}
:where(a,button,input,select,textarea,summary,[role="tab"]):focus-visible{outline:var(--focus-ring);outline-offset:3px}
.wrap{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space);overflow-x:clip;max-width:100%}
.section-head{max-width:760px;margin:0 auto 48px;text-align:center}
.section-kicker{display:block;margin-bottom:12px;color:var(--color-accent-dark);font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}
.section-lede{margin:16px auto 0;color:var(--color-muted);font-size:18px}
.no-break{white-space:nowrap}
.muted{color:var(--color-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.panel,.card{min-width:0;border:1px solid var(--color-border-soft);border-radius:var(--radius-lg);background:var(--color-panel);box-shadow:var(--shadow-panel)}
.card{padding:28px}
.badge,.chip{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:28px;max-width:100%;
  padding:3px 11px;border:1px solid var(--color-border);border-radius:var(--radius-pill);
  background:var(--color-panel);color:var(--color-muted);font-size:13px;font-weight:700;
}
.badge-dot{width:8px;height:8px;flex-shrink:0;border-radius:50%;background:var(--color-accent)}
.badge-success{border-color:var(--color-accent);background:var(--color-mint);color:var(--color-accent-dark)}
.badge-warning{background:var(--color-butter);color:var(--color-text)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;min-width:24px;min-height:48px;
  padding:10px 22px;border:1px solid transparent;border-radius:var(--radius-pill);
  font-weight:700;line-height:1.2;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(180deg,var(--color-accent-light),var(--color-accent));color:var(--color-text);box-shadow:inset 0 1px 0 var(--color-highlight),0 10px 24px var(--color-shadow-accent)}
.btn-secondary{border-color:var(--color-text);background:var(--color-panel);color:var(--color-text)}
.btn-soft{border-color:var(--color-border);background:var(--color-panel-deep);color:var(--color-text)}
.btn-small{min-height:40px;padding:8px 17px;font-size:14px}
.button-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.reveal{transition:opacity .65s ease,transform .65s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.site-head{position:relative;z-index:50;border-bottom:1px solid var(--color-border);background:var(--color-panel)}
.head-row{display:flex;align-items:center;gap:30px;min-height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:44px}
.brand-mark{width:34px;height:34px;flex-shrink:0;filter:drop-shadow(0 4px 10px var(--color-shadow-accent))}
.brand-name{font-family:var(--font-display);font-size:21px;font-weight:800;letter-spacing:-.02em}
.brand-name-local{color:var(--color-muted);font-size:15px;font-weight:600}
.desktop-nav{display:flex;align-items:center;gap:27px;margin-left:20px;flex:1}
.desktop-nav a{position:relative;display:inline-flex;align-items:center;min-height:44px;font-size:14px;font-weight:550}
.desktop-nav a.is-active{font-weight:750}
.desktop-nav a.is-active::after{content:"";position:absolute;right:0;bottom:2px;left:0;height:2px;border-radius:var(--radius-pill);background:var(--color-accent)}
.head-tools{display:flex;align-items:center;gap:10px;flex:none}
.lang-control{position:relative}
.lang-trigger,.menu-trigger{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:0;background:transparent;cursor:pointer}
.lang-trigger{gap:6px;color:var(--color-muted);font-size:14px}
.lang-menu{position:absolute;top:calc(100% + 8px);right:0;z-index:60;display:none;width:168px;padding:8px;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-panel);box-shadow:var(--shadow-panel)}
.lang-control.is-open .lang-menu{display:block}
.lang-menu a{display:flex;align-items:center;min-height:42px;padding:7px 10px;border-radius:var(--radius-sm);font-size:14px}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--color-panel-deep)}
.login-link{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 19px;border:1.5px solid var(--color-text);border-radius:var(--radius-pill);background:var(--color-panel);font-size:14px;font-weight:700}
.menu-trigger{display:none;border-radius:var(--radius-sm)}
.menu-lines,.menu-lines::before,.menu-lines::after{display:block;width:21px;height:2px;border-radius:2px;background:var(--color-text)}
.menu-lines{position:relative}
.menu-lines::before,.menu-lines::after{content:"";position:absolute;left:0}
.menu-lines::before{top:-7px}.menu-lines::after{top:7px}
.mobile-nav{position:absolute;top:100%;right:0;left:0;z-index:55;display:none;max-height:calc(100dvh - var(--header-height));padding:10px var(--gutter) 22px;border-top:1px solid var(--color-border);background:var(--color-panel);overflow-y:auto;overscroll-behavior:contain}
.mobile-nav.is-open{display:block}
.mobile-nav a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 8px;border-bottom:1px solid var(--color-border-soft);font-weight:650}
.mobile-nav a.is-active{color:var(--color-accent-dark)}
.mobile-nav-label{display:block;padding:18px 8px 5px;color:var(--color-muted);font-size:12px;font-weight:700;letter-spacing:.12em}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:40;display:none;background:var(--color-overlay)}
.nav-veil.is-open{display:block}
.notice{border-bottom:1px solid var(--color-border-soft);background:var(--color-mint)}
.notice-row{display:flex;align-items:center;justify-content:center;gap:14px;min-height:44px;font-size:14px}
.notice-tag{display:inline-flex;align-items:center;min-height:24px;padding:2px 9px;border-radius:6px;background:var(--color-accent-dark);color:var(--color-panel);font-size:12px;font-weight:750;letter-spacing:.06em}
.notice-text{font-weight:650}.notice-text b{color:var(--color-accent-dark)}
.notice-link{min-height:24px;border-bottom:1px solid var(--color-accent-dark);font-weight:600}
.site-footer{padding-top:64px;background:var(--color-footer);color:var(--color-footer-text)}
.footer-grid{display:grid;grid-template-columns:minmax(220px,1.25fr) repeat(3,minmax(150px,1fr));gap:48px;padding-bottom:48px}
.footer-grid>*{min-width:0}
.footer-brand{max-width:360px}
.footer-brand .brand-name{color:var(--color-footer-text)}
.footer-brand p{margin-top:18px;color:var(--color-footer-muted)}
.footer-title{margin-bottom:16px;color:var(--color-footer-text);font-size:14px;font-weight:750;letter-spacing:.08em}
.footer-links{display:grid;gap:9px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--color-footer-muted);font-size:14px}
.footer-links a:hover{color:var(--color-footer-text)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:22px;padding-bottom:26px;border-top:1px solid var(--color-muted);color:var(--color-footer-muted);font-size:13px}
.footer-legal,.footer-languages{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.prose{min-width:0}
.prose h2{margin-top:2em;margin-bottom:.65em}
.prose h3{margin-top:1.7em;margin-bottom:.55em}
.prose ul,.prose ol{margin:1em 0 1.4em;padding-left:1.4em}
.prose li{margin:.45em 0}
.prose a{text-decoration:underline;text-decoration-color:var(--color-accent);text-underline-offset:3px}
.prose img{border-radius:var(--radius-lg)}
#server-status{position:relative;display:block;width:100%;max-width:100%;margin-bottom:24px;overflow:hidden}
#server-status+*{margin-top:24px}
.tilt-card{transform-style:preserve-3d;will-change:transform}
@media (max-width:1080px){
  .desktop-nav{gap:16px;margin-left:4px}
  .desktop-nav a{font-size:13px}
  .footer-grid{grid-template-columns:1.2fr 1fr 1fr}
}
@media (max-width:860px){
  .desktop-nav,.head-tools .lang-control{display:none}
  .head-tools{margin-left:auto}
  .menu-trigger{display:inline-flex}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  h1,.hero-title{font-size:clamp(34px,9vw,40px);line-height:1.16;letter-spacing:-.02em}
  h2{font-size:clamp(30px,8vw,40px)}
  .section-head{text-align:left}
}
@media (max-width:640px){
  .no-break{white-space:normal}
  .wrap,.reading-wrap{padding-inline:max(16px,var(--gutter))}
  .section{padding-top:64px;padding-bottom:64px;max-width:100%}
  .card{padding:22px}
  .button-row{align-items:stretch}
  .button-row .btn{width:100%}
  .notice-row{justify-content:flex-start;flex-wrap:wrap;gap:5px 9px;padding-top:8px;padding-bottom:8px}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .tilt-card,[class*="tilt"]{transform:none}
  pre{padding:16px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1!important;transform:none!important}
}