:root {
  color-scheme:light;
  --bg:#F5F7FA;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#EDF1F6;
  --border:#E0E6EF;
  --accent:#E3337F;
  --accent-dark:#B81E62;
  --text:#0F1420;
  --text-muted:#596377;
  --success:#16A35C;
  --warn:#D9951A;
  --error:#D63A3A;
  --ink-2:#2A3448;
  --sky:#CFE5FC;
  --sky-2:#E2EEFB;
  --sky-deep:#2B78D0;
  --sky-tint:#E4F0FE;
  --sky-tint-2:#F3F8FF;
  --sky-ring:rgba(43,120,208,.16);
  --sky-ring-strong:rgba(43,120,208,.46);
  --success-tint:#E2F4EA;
  --success-ring:rgba(22,163,92,.2);
  --glass:rgba(255,255,255,.7);
  --glass-strong:rgba(255,255,255,.88);
  --menubar:rgba(255,255,255,.44);
  --hl:rgba(255,255,255,.96);
  --hl-soft:rgba(255,255,255,.55);
  --hl-dim:rgba(255,255,255,.16);
  --glare:rgba(255,255,255,.2);
  --cloud:rgba(255,255,255,.92);
  --cloud-0:rgba(255,255,255,0);
  --line-on-sky:rgba(15,20,32,.14);
  --shadow-sky:rgba(43,120,208,.12);
  --shadow-sky-2:rgba(43,120,208,.14);
  --shadow-sky-3:rgba(43,120,208,.24);
  --shadow-ink:rgba(15,20,32,.1);
  --shadow-ink-2:rgba(15,20,32,.3);
  --fc-ring:rgba(43,120,208,.08);
  --dot-ring:rgba(15,20,32,.14);
  --metal-1:#F4F6F9;
  --metal-2:#DCE1E8;
  --metal-3:#BBC2CC;
  --metal-4:#9DA6B2;
  --bezel:#0B0F17;
  --bezel-2:#1B212C;
  --cam:#2A3446;
  --plinth-2:#E9EEF5;
  --plinth-ring:rgba(43,120,208,.1);
  --wall-1:#B9D7F7;
  --wall-2:#D6E7FA;
  --wall-3:#EEF4FB;
  --flag-white:#FFFFFF;
  --flag-red:#C8102E;
  --flag-navy:#012169;
  --flag-jp:#BC002D;
  --flag-hk:#DE2910;
  --flag-sg:#EF3340;
  --flag-nl-red:#AE1C28;
  --flag-nl-blue:#21468B;
  --flag-ring:rgba(15,20,32,.16);
  --pink-tint:#FCE4EF;
  --mint-tint:#DDF3E9;
  --mist-tint:#E2E5EF;
  --apricot-tint:#F5E9DC;
  --navy-card:#183651;
  --navy-card-end:#244D70;
  --f-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:6px;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:20px;
  --r-xl:30px;
  --r-card:32px;
  --r-pill:999px;
  --r-circle:50%;
  --r-logo:9px;
  --wrap:1376px;
  --reading:840px;
  --gutter:32px;
  --header-height:60px;
  --toc-height:64px;
  --anchor-offset:140px;
  --s:1;
  --ease:cubic-bezier(.2,.65,.3,1);
  --fast:.2s;
  --reveal-time:.35s;
  --panel-shadow:inset 0 1px 0 var(--hl),0 24px 56px -24px var(--shadow-sky);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-height) + 16px);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,video{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
a{color:inherit;text-underline-offset:.2em}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--sky-deep);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3,h4,p{overflow-wrap:break-word}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance}
h1{font-size:clamp(52px,4.5vw,68px);font-weight:900;line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(28px,3.2vw,44px);line-height:1.18;font-weight:900;letter-spacing:-.02em}
h3{font-size:23px;line-height:1.3;font-weight:800;letter-spacing:-.01em}
p{margin:0 0 1em}
.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:80px;padding-bottom:80px}
.section-head{max-width:820px;margin:0 auto 36px;text-align:center}
.section-head h2{margin:0 0 16px}
.section-head p{color:var(--text-muted);font-size:18px}
.muted{color:var(--text-muted)}
.mono{font-family:var(--f-mono)}
.accent{color:var(--accent)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.panel,.card{min-width:0;padding:28px;border-radius:var(--r-xl);background:var(--bg-panel);box-shadow:var(--panel-shadow)}
.panel-inset{background:var(--bg-panel-2);box-shadow:inset 0 1px 0 var(--hl)}
code{font-family:var(--f-mono);font-size:.9em;overflow-wrap:anywhere}
p code,li code{padding:2px 5px;background:var(--bg-panel-2);border-radius:var(--r-xs)}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-md);line-height:1.7}
pre code{white-space:pre;overflow-wrap:normal}
.prose{min-width:0;line-height:1.9}
.prose h2{margin-top:2em}
.prose h3{margin-top:1.6em}
.prose p,.prose li{overflow-wrap:anywhere}
.prose ul,.prose ol{padding-left:1.5em}
.prose blockquote{margin-inline:0}
.icon{width:18px;height:18px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.skip{position:absolute;left:16px;top:-64px;z-index:100;padding:10px 16px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel);font-size:14px;text-decoration:none}
.skip:focus{top:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;flex-shrink:0;min-width:168px;min-height:52px;padding:12px 30px;border:0;border-radius:var(--r-pill);font-size:16.5px;font-weight:700;line-height:1.5;text-decoration:none;white-space:nowrap;transition:transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease)}
.btn svg{width:17px;height:17px}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-solid,.btn-primary{background:var(--text);color:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hl-dim),0 16px 30px -16px var(--shadow-ink-2)}
.btn-line,.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text),0 12px 26px -18px var(--shadow-sky-3)}
.btn-small{min-width:0;min-height:38px;padding:8px 18px;font-size:14px}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;transform:none;pointer-events:none}
.btn-demo-hover{transform:translateY(-2px);box-shadow:0 18px 30px -12px var(--shadow-ink-2)}
.btn-demo-focus{outline:2px solid var(--sky-deep);outline-offset:3px}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:22px}
#site-header{position:relative;z-index:40;min-height:var(--header-height)}
.topbar{position:relative;z-index:43;display:flex;align-items:center;flex-wrap:nowrap;gap:20px;max-width:var(--wrap);height:var(--header-height);margin:0 auto;padding:0 var(--gutter)}
.brand{display:flex;align-items:center;gap:10px;flex:none;color:var(--text);text-decoration:none}
.brand-logo{width:32px;height:32px;border-radius:var(--r-logo);flex-shrink:0}
.brand-en{font-family:var(--f-display);font-size:19px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.brand-zh{padding-left:10px;border-left:1px solid var(--line-on-sky);font-size:13px;font-weight:500;color:var(--text-muted)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav ul{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav li{min-width:0}
.nav a{display:flex;align-items:center;gap:6px;padding:7px 11px;min-height:36px;border-radius:var(--r-pill);color:var(--text);font-size:14px;font-weight:500;text-decoration:none;white-space:nowrap}
.nav a svg{width:16px;height:16px;flex:none;color:var(--ink-2)}
.nav a:hover{background:var(--hl-soft)}
.nav a[aria-current="page"]{background:var(--glass-strong);box-shadow:inset 0 1px 0 var(--hl),0 6px 14px -8px var(--shadow-sky-3);font-weight:600}
.tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--cloud-0);color:var(--text);font-size:14px;font-weight:500;white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{background:var(--hl-soft)}
.lang-panel{position:absolute;top:calc(100% + 10px);right:0;z-index:60;min-width:180px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--panel-shadow)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 12px;border-radius:var(--r-sm);font-size:14px;text-decoration:none;white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.tools-sep{width:1px;height:18px;background:var(--line-on-sky)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 20px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel);font-size:14px;font-weight:600;white-space:nowrap;text-decoration:none;box-shadow:inset 0 1px 0 var(--hl-dim),0 10px 20px -12px var(--shadow-ink-2);transition:transform var(--fast) var(--ease)}
.login svg{width:15px;height:15px}
.login:hover{transform:translateY(-1px)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border:0;border-radius:var(--r-sm);background:var(--cloud-0)}
.menu-toggle svg{width:22px;height:22px}
.nav-drawer{position:fixed;inset:var(--header-height) 0 auto;z-index:42;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:20px var(--gutter) 40px;overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel)}
.nav-drawer ul{margin:0;padding:0;list-style:none}
.nav-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:12px 16px;border-radius:var(--r-sm);text-decoration:none}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--sky-tint)}
.nav-drawer a svg{width:18px;height:18px}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.drawer-languages a[aria-current="true"]{font-weight:800;background:var(--bg-panel-2)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:41;border:0;background:var(--shadow-ink-2)}
html.nav-open{overflow:hidden}
.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-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
.site-footer{position:relative;padding-top:56px;padding-bottom:24px;background:linear-gradient(180deg,var(--bg-panel-2),var(--sky-tint-2));border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:350px;margin-top:20px;color:var(--text-muted);line-height:1.8}
.footer-title{margin:0 0 16px;font-size:15px;font-weight:800}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 18px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:30px;color:var(--text-muted);font-size:14px;text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover{color:var(--text)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;text-decoration:none}
.footer-languages a[aria-current="true"]{font-weight:800}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:20px;margin-top:24px;border-top:1px solid var(--border);color:var(--text-muted);font-size:13px}
.footer-legal{display:flex;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none}
@media(min-width:1201px) and (max-width:1375px){
  .topbar{gap:12px}
  .nav a{gap:4px;padding-inline:7px;font-size:13px}
  .tools{gap:6px}
}
@media(max-width:1200px){
  .nav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .topbar{gap:12px}
}
@media(min-width:1201px){
  .nav-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  :root{--gutter:24px}
  h1{font-size:clamp(28px,6vw,40px)}
  h2{font-size:clamp(27px,5vw,34px)}
  .sec{padding-top:56px;padding-bottom:56px}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .wrap,.reading-wrap{padding-inline:var(--gutter)}
  .topbar{gap:8px}
  .brand{gap:7px}
  .brand-en{font-size:17px}
  .brand-logo{width:28px;height:28px}
  .tools{gap:4px;margin-left:auto}
  .lang{padding-inline:6px;font-size:12px}
  .lang svg{width:14px;height:14px}
  .tools-sep{display:none}
  .login{height:36px;padding-inline:12px;font-size:13px}
  .login svg{display:none}
  .grid,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-brand{grid-column:auto}
  .panel,.card{padding:22px}
  .btn{min-width:0;padding-inline:24px;font-size:15px}
  .tilt,.decorative-tilt{transform:none}
  .decoration,.stripe-halo{max-width:100%}
}
@media(max-width:359px){
  .brand-en{font-size:15px}
  .lang{font-size:11px;gap:3px}
  .lang svg{display:none}
  .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}
}