:root {
  --bg:#E9EAF8;--panel:#F7F7FE;--panel-2:#DCDEF2;--border:#CDD0EA;
  --accent:#5E52D8;--accent-dark:#4338B0;--accent-soft:#8D84EE;
  --text:#1E1F3A;--muted:#5E6283;--success:#1E9E78;--success-soft:#D4F0E6;--warn:#E0902E;--error:#D94E5C;--white:#FFFFFF;
  --teal:#3FBFB8;--teal-deep:#2A9F99;--teal-ink:#17706B;--teal-light:#8FDCD2;--teal-soft:#D3F1EE;--mint:#CCF0EA;--mint-2:#A9E3DB;
  --far-1:#D4D7F3;--far-2:#C7DCEF;--sky-1:#F1F1FC;--sky-2:#DDE6F7;--sky-3:#DFE5F6;--cloud-shade:#E4E8FA;
  --coral:#F07A86;--coral-soft:#FAD3D8;--orange:#F5A06A;--orange-soft:#FCDDC8;--butter:#F4D77E;--butter-soft:#FBEFC8;--butter-mid:#F7E3A1;--blue:#5B95DE;--blue-mid:#BDD3F4;--lilac-mid:#C7C1F7;
  --device-1:#45486C;--device-2:#6D7098;--device-3:#D6D8EF;--device-4:#A4A7CB;
  --flag-hk:#DE2910;--flag-sg:#E0303B;--flag-jp:#BC002D;--flag-navy:#33356E;--flag-us-red:#C0283A;--flag-black:#23242C;--flag-de-red:#D7141A;--flag-gold:#F7C600;--flag-fr-blue:#1F4FA3;--flag-fr-red:#E6413A;
  --accent-a06:rgba(94,82,216,.06);--accent-a10:rgba(94,82,216,.10);--accent-a12:rgba(94,82,216,.12);--accent-a18:rgba(94,82,216,.18);--accent-a30:rgba(94,82,216,.30);
  --ink-a14:rgba(30,31,58,.14);--white-a40:rgba(255,255,255,.40);--white-a55:rgba(255,255,255,.55);--white-a70:rgba(255,255,255,.70);--white-a88:rgba(255,255,255,.88);--panel-glass:rgba(247,247,254,.66);--border-a60:rgba(205,208,234,.60);--veil:rgba(30,31,58,.24);
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo','Malgun Gothic',sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Yu Gothic','Microsoft YaHei','Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-sm:8px;--r-md:14px;--r-lg:16px;--r-card:32px;--r-pill:999px;--r-circle:50%;
  --gutter:24px;--content:1200px;--head-height:72px;--anchor-offset:156px;
  --display-size:clamp(52px,4.6vw,66px);--h2-size:clamp(28px,3vw,40px);--body-size:16px;--small-size:14px;
  --shadow:0 16px 40px var(--accent-a12);--highlight:inset 0 1px 0 var(--white-a88);
  --ease:cubic-bezier(.2,.7,.3,1);--fast:.2s;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--head-height) + 16px)}
html,body{margin:0}
body{font:var(--body-size)/1.7 var(--font-body);color:var(--text);background:var(--panel);-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button,summary{cursor:pointer}
a{color:inherit;text-underline-offset:.2em}
button,a,summary,input,select,textarea{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--font-display);line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--display-size);font-weight:800;letter-spacing:-.02em}
h2{font-size:var(--h2-size);font-weight:800;letter-spacing:-.02em}
h3{font-size:22px;font-weight:700}
p{margin:0 0 1.2em}
ul,ol{padding-left:1.4em}
code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.reading-wrap{max-width:840px}
.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))}
:where(.grid,.head-in,.footer-grid,.promo-block)>*{min-width:0}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--highlight),var(--shadow)}
.panel-recessed{background:var(--panel-2);box-shadow:inset 0 2px 8px var(--accent-a06)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.center{text-align:center}
.no-break{white-space:nowrap}
.icon{width:24px;height:24px;display:inline-block;vertical-align:middle;fill:currentColor}
.icon-line{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:12px 30px;border:0;border-radius:var(--r-pill);font-size:17px;font-weight:700;line-height:1.4;text-decoration:none;flex-shrink:0;white-space:nowrap;transition:transform var(--fast),box-shadow var(--fast)}
.btn svg{width:18px;height:18px}
.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent-soft) -40%,var(--accent) 55%,var(--accent-dark) 150%);box-shadow:0 14px 30px var(--accent-a30),inset 0 1px 0 var(--white-a40)}
.btn-primary:hover,.btn-hover{transform:translateY(-2px);box-shadow:0 18px 36px var(--accent-a30),var(--highlight)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost,.btn-secondary{color:var(--accent);background:var(--panel);box-shadow:inset 0 0 0 2px var(--accent),0 10px 24px var(--accent-a10)}
.btn-ghost:hover,.btn-secondary:hover{transform:translateY(-2px)}
.btn-small{min-height:44px;font-size:14px;padding:10px 20px}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
.btn-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-row{display:flex;justify-content:center;flex-wrap:wrap;gap:16px;margin-top:28px}
.badge,.eyebrow{display:inline-flex;align-items:center;gap:10px;max-width:100%;padding:5px 14px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--white-a70);box-shadow:var(--highlight),0 8px 20px var(--accent-a10);font-size:13px;color:var(--muted)}
.badge b{color:var(--text)}
.badge svg{width:22px;height:22px}
.badge .sep{height:12px;width:1px;background:var(--border);flex-shrink:0}
.eyebrow{background:var(--panel-2);font-weight:700;letter-spacing:.06em}
.dot{width:8px;height:8px;display:inline-block;flex-shrink:0;border-radius:var(--r-circle);background:var(--dc,var(--success));box-shadow:0 0 0 3px color-mix(in srgb,var(--dc,var(--success)) 22%,transparent)}
.dt-green{--dc:var(--success)}.dt-teal{--dc:var(--teal)}.dt-orange{--dc:var(--orange)}.dt-blue{--dc:var(--blue)}.dt-coral{--dc:var(--coral)}
.site-head{position:relative;z-index:60;height:var(--head-height);background:var(--panel-glass);backdrop-filter:blur(14px) saturate(1.2);border-bottom:1px solid var(--border-a60);box-shadow:inset 0 -1px 0 var(--white-a70)}
#site-header{position:relative;z-index:60}
.head-in{max-width:1320px;height:100%;margin:auto;padding-inline:32px;display:flex;align-items:center;flex-wrap:nowrap;gap:20px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.brand img{display:block;width:34px;height:34px;filter:drop-shadow(0 6px 12px var(--accent-a18))}
.brand-word{font-family:var(--font-display);font-size:20px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.brand-word span{font-weight:600;color:var(--muted)}
.nav{flex:1;min-width:0;margin-inline:auto}
.nav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:4px}
.nav a{display:block;padding:8px 14px;border-radius:var(--r-pill);font-size:14.5px;font-weight:500;color:var(--muted);text-decoration:none;white-space:nowrap;transition:background-color var(--fast),color var(--fast)}
.nav a:hover{background:var(--white-a55);color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:700;background:var(--white);box-shadow:inset 0 0 0 1px var(--border),0 6px 16px var(--accent-a12)}
.head-tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:40px;padding:0 12px;border:0;border-radius:var(--r-pill);background:transparent;font-size:14px;color:var(--muted);white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{background:var(--white-a55)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:90;min-width:170px;padding:8px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--shadow)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 22px;border-radius:var(--r-pill);background:var(--text);color:var(--white);font-size:14px;font-weight:700;text-decoration:none;box-shadow:0 8px 18px var(--accent-a18),inset 0 1px 0 var(--white-a40)}
.menu-btn{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--white);color:var(--text)}
.menu-btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.mobile-drawer{position:fixed;z-index:55;top:var(--head-height);left:0;right:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 16px;border-radius:var(--r-md);text-decoration:none}
.mobile-drawer a[aria-current="page"]{background:var(--panel-2);font-weight:700}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:50;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{background:linear-gradient(180deg,var(--bg),var(--panel-2));border-top:1px solid var(--white);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;color:var(--muted);margin-top:20px}
.footer-heading{font-size:16px;margin:0 0 16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px;list-style:none;margin:0;padding:0}
.footer-links a,.footer-languages a,.legal-links a{display:inline-flex;align-items:center;min-height:32px;color:var(--muted);font-size:14px;text-decoration:none}
.footer-links a:hover,.legal-links a:hover{color:var(--text);text-decoration:underline}
.footer-languages{display:flex;gap:12px 24px;flex-wrap:wrap;margin-top:32px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:16px}
.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:80px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
.decor-section{position:relative;overflow-x:clip}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--anchor-offset)}
@media(min-width:1101px) and (max-width:1280px){
  .head-in{gap:12px;padding-inline:24px}.nav a{padding-inline:9px;font-size:13px}.head-tools{gap:6px}.lang{padding-inline:8px}
}
@media(max-width:1100px){
  .nav{display:none}.head-tools{margin-left:auto}.menu-btn{display:inline-flex}
}
@media(min-width:1101px){.mobile-drawer,.nav-veil{display:none}}
@media(max-width:768px){
  :root{--display-size:clamp(28px,6vw,40px);--gutter:20px}
  .sec{padding-top:56px;padding-bottom:56px}.grid-three,.grid-five{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .head-in{padding-inline:var(--gutter);gap:10px}.head-tools{gap:6px}
  .brand-word{font-size:18px}.brand{gap:7px}.lang{padding-inline:8px;font-size:12px}.login{padding-inline:16px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decor-section>*[aria-hidden="true"]{max-width:100%}
  .panel,.card{padding:22px}.head-in{gap:6px}.brand img{width:28px;height:28px}
  .brand-word{font-size:16px}.login{padding-inline:12px;font-size:13px}
  .lang{gap:4px;padding-inline:5px;font-size:11px}.lang svg{width:14px;height:14px}
  .head-tools{gap:4px}.btn{padding-inline:24px;font-size:16px}
}
@media(max-width:350px){.brand-word{font-size:14px}.brand{gap:4px}.head-in{padding-inline:12px}.lang{font-size:10px}.login{padding-inline:10px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}