:root {
  --c-bg:#FFFFFF;
  --c-bg-0:rgba(255,255,255,0);
  --c-bg-70:rgba(255,255,255,.72);
  --c-bg-92:rgba(255,255,255,.92);
  --c-panel:#F8F8FA;
  --c-panel-2:#F1F1F4;
  --c-line:#E6E6EB;
  --c-line-soft:#EFEFF3;
  --c-line-strong:#D9D9E0;
  --c-skel:#ECECF0;
  --c-skel-2:#E3E3E9;
  --c-dot:#DCDCE2;
  --c-dot-edge:#CDCDD5;
  --c-ink:#18181D;
  --c-ink-2:#3A3A44;
  --c-muted:#6B6B76;
  --c-faint:#9C9CA7;
  --c-on-ink:#FFFFFF;
  --c-accent:#A12CE0;
  --c-accent-dark:#6A14A8;
  --c-magenta:#E7489A;
  --c-cobalt:#4D7CFE;
  --c-accent-ring:rgba(161,44,224,.14);
  --c-success:#1F9D5C;
  --c-success-ring:rgba(31,157,92,.16);
  --c-warn:#C98200;
  --c-error:#D63A3A;
  --c-mask:#000000;
  --c-clear:transparent;
  --glow-magenta:rgba(231,72,154,.13);
  --glow-cobalt:rgba(77,124,254,.11);
  --grad-accent:linear-gradient(100deg,var(--c-accent) 0%,var(--c-magenta) 52%,var(--c-cobalt) 100%);
  --r-container:28px;
  --r-card:20px;
  --r-float:16px;
  --r-window:16px;
  --r-ctl:10px;
  --r-select:8px;
  --r-menu:12px;
  --r-segment:6px;
  --r-sm:7px;
  --r-skeleton:4px;
  --r-line:2px;
  --r-pill:999px;
  --r-round:50%;
  --sh-xs:0 1px 2px rgba(24,24,29,.05);
  --sh-sm:0 1px 2px rgba(24,24,29,.04),0 4px 12px -4px rgba(24,24,29,.08);
  --sh-btn:0 1px 2px rgba(24,24,29,.14),0 10px 20px -10px rgba(24,24,29,.42);
  --sh-window:0 1px 1px rgba(24,24,29,.04),0 12px 28px -12px rgba(24,24,29,.12),0 44px 96px -32px rgba(24,24,29,.20);
  --sh-float:0 2px 4px rgba(24,24,29,.05),0 18px 34px -14px rgba(24,24,29,.18),0 40px 70px -28px rgba(24,24,29,.24);
  --sh-knob:0 1px 2px rgba(24,24,29,.22);
  --sh-input:inset 0 1px 1px rgba(24,24,29,.03);
  --f-display:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --f-body:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --shell:1240px;
  --reading:800px;
  --gutter:32px;
  --nav-h:68px;
  --space-section:96px;
  --text-body:15px;
  --text-small:13px;
  --text-h2:clamp(26px,3vw,36px);
  --text-h3:22px;
  --text-h1:clamp(34px,3.4vw,48px);
  --weight-body:400;
  --weight-medium:500;
  --weight-bold:600;
  --weight-brand:700;
  --weight-display:800;
  --ease-ui:180ms ease;
  --ease-reveal:550ms ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:100px}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--c-bg);color:var(--c-ink);font-family:var(--f-body);font-size:var(--text-body);font-weight:var(--weight-body);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:none}
img,svg{max-width:100%;vertical-align:middle}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
button:disabled{cursor:not-allowed}
input,select,textarea{max-width:100%}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--f-display);font-weight:var(--weight-display);line-height:1.25;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:var(--text-h1);line-height:1.1}
h2{font-size:var(--text-h2);margin:0 0 24px}
h3{font-size:var(--text-h3);margin:0 0 12px}
p{margin:0 0 18px}
strong{font-weight:var(--weight-bold)}
code,kbd,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere;word-break:normal}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:20px;background:var(--c-panel);color:var(--c-ink);border:1px solid var(--c-line);border-radius:var(--r-ctl);font-size:var(--text-small)}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:3px;border-radius:var(--r-sm)}
::selection{background:var(--c-panel-2);color:var(--c-ink)}
.wrap{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.reading{max-width:calc(var(--reading) + var(--gutter)*2)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-lined{border-top:1px solid var(--c-line)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.nowrap{white-space:nowrap}
.muted{color:var(--c-muted)}
.small{font-size:var(--text-small)}
.mono{font-family:var(--f-mono)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.ico{fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;width:24px;height:24px;flex-shrink:0}
.prose{min-width:0;line-height:1.85}
.prose :where(h2,h3){scroll-margin-top:110px}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not([class]){text-decoration:underline;text-underline-offset:3px}
.prose li{margin-bottom:8px}
.prose :where(div,section,article){min-width:0;max-width:100%}
.card,.panel{border:1px solid var(--c-line);color:var(--c-ink);min-width:0}
.card{padding:28px;border-radius:var(--r-card);background:var(--c-bg);box-shadow:var(--sh-sm)}
.panel{padding:36px;border-radius:var(--r-container);background:var(--c-panel)}
.card p:last-child,.panel p:last-child{margin-bottom:0}
.ink-grad{font-style:normal;background:var(--grad-accent);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:var(--c-clear);color:var(--c-clear);padding-right:.04em}
.pill-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:10px 24px;border-radius:var(--r-pill);font-family:var(--f-body);font-size:15px;font-weight:var(--weight-bold);letter-spacing:-.005em;border:1.5px solid var(--c-clear);text-align:center;transition:background var(--ease-ui),box-shadow var(--ease-ui),color var(--ease-ui)}
.pill-btn .ico{width:16px;height:16px}
.pill-btn--ink{color:var(--c-on-ink);background:linear-gradient(var(--c-ink),var(--c-ink)) padding-box,linear-gradient(var(--c-ink),var(--c-ink)) border-box;box-shadow:var(--sh-btn)}
.pill-btn--ink:hover,.pill-btn--ink.is-hover{background:linear-gradient(var(--c-ink),var(--c-ink)) padding-box,var(--grad-accent) border-box}
.pill-btn--line{color:var(--c-ink);background:var(--c-bg);border-color:var(--c-line);box-shadow:var(--sh-xs)}
.pill-btn--line:hover{background:var(--c-panel);color:var(--c-ink)}
.pill-btn--sm{min-height:38px;padding:7px 18px;font-size:14px;box-shadow:var(--sh-xs)}
.pill-btn:disabled{background:var(--c-panel-2);color:var(--c-muted);border-color:var(--c-line);box-shadow:none}
.pill-btn.is-focus{outline:2px solid var(--c-accent);outline-offset:3px}
#site-header{position:sticky;top:0;z-index:50}
.masthead{position:sticky;top:0;z-index:50;min-height:var(--nav-h);background:var(--c-bg-92);color:var(--c-ink);-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px)}
#site-header .masthead{position:relative}
.masthead-inner{width:100%;max-width:min(100%,calc(1280px + var(--gutter)*2));min-height:var(--nav-h);margin-inline:auto;padding-inline:var(--gutter);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px}
.brand-lockup{display:inline-flex;align-items:center;gap:10px;justify-self:start;flex-shrink:0}
.brandmark{width:32px;height:32px;flex:none}
.brand-word{font-family:var(--f-display);font-weight:var(--weight-brand);font-size:16px;letter-spacing:-.01em;color:var(--c-ink)}
.navrail{min-width:0}
.navrail ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:4px}
.navrail-link{display:inline-flex;align-items:center;gap:8px;min-height:36px;padding:6px 15px;border-radius:var(--r-pill);font-size:14.5px;font-weight:var(--weight-medium);color:var(--c-muted);white-space:nowrap;transition:color var(--ease-ui),background-color var(--ease-ui)}
.navrail-link:hover{color:var(--c-ink)}
.navrail-link.is-current{background:var(--c-panel-2);color:var(--c-ink)}
.navrail-link.is-current::before{content:"";width:6px;height:6px;flex:none;border-radius:var(--r-round);background:var(--grad-accent)}
.mast-tools{justify-self:end;display:flex;align-items:center;gap:6px;flex-shrink:0}
.lang-control{position:relative}
.lang-pick{min-height:36px;padding:6px 14px;border-radius:var(--r-pill);font-size:14px;font-weight:var(--weight-medium);color:var(--c-muted);white-space:nowrap}
.lang-pick:hover{background:var(--c-panel);color:var(--c-ink)}
.lang-short{display:none}
.lang-menu{position:absolute;top:calc(100% + 10px);right:0;min-width:180px;padding:6px;background:var(--c-bg);color:var(--c-ink);border:1px solid var(--c-line);border-radius:var(--r-menu);box-shadow:var(--sh-float);z-index:5}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm)}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--c-panel-2);color:var(--c-ink)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--r-pill)}
.nav-drawer{display:none}
.nav-veil{position:fixed;inset:0;z-index:40;background:var(--c-bg-70);color:var(--c-ink)}
.site-footer{border-top:1px solid var(--c-line);padding-top:64px;padding-bottom:96px;background:var(--c-bg);color:var(--c-ink)}
.footer-grid{display:grid;grid-template-columns:1.35fr .8fr 1.5fr .8fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;max-width:290px;color:var(--c-muted)}
.footer-title{font-size:14px;font-weight:var(--weight-bold);margin:0 0 16px}
.footer-links{list-style:none;padding:0;margin:0}
.footer-links a{display:inline-block;padding-top:5px;padding-bottom:5px;color:var(--c-muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--c-ink);text-decoration:underline;text-underline-offset:3px}
.footer-bottom{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;margin-top:48px;padding-top:24px;border-top:1px solid var(--c-line);font-size:var(--text-small);color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{opacity:1;transform:none}
.reveal-ready .reveal:not(.shown){opacity:0;transform:translateY(14px)}
.reveal-ready .reveal{transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.shown{opacity:1;transform:none}
@media(max-width:1280px){
  .masthead-inner{display:flex;gap:20px}
  .navrail{margin-left:auto}
  .navrail-link{padding-inline:11px}
}
@media(max-width:1100px){
  .masthead-inner{gap:12px}
  .masthead .navrail{display:none}
  .mast-tools{margin-left:auto}
  .mast-tools>.pill-btn{display:none}
  .menu-toggle{display:inline-flex}
  .nav-drawer:not([hidden]){display:block;position:absolute;top:100%;left:0;right:0;padding:16px var(--gutter) 24px;background:var(--c-bg);color:var(--c-ink);border-bottom:1px solid var(--c-line);box-shadow:var(--sh-sm);max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain}
  .nav-drawer ul{list-style:none;margin:0;padding:0}
  .nav-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-menu)}
  .nav-drawer a.is-current,.nav-drawer a[aria-current]{background:var(--c-panel-2);color:var(--c-ink)}
  .drawer-languages{border-top:1px solid var(--c-line);margin-top:16px!important;padding-top:16px!important}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--gutter:20px;--space-section:64px;--text-h1:clamp(24px,6vw,30px)}
  .grid--three,.grid--two{grid-template-columns:minmax(0,1fr)}
  .card{padding:24px}
  .panel{padding:26px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .wrap{padding-inline:var(--gutter)}
  .brand-word{font-size:14px}
  .brandmark{width:28px;height:28px}
  .brand-lockup{gap:7px}
  .masthead-inner{gap:4px}
  .mast-tools{gap:0;margin-left:auto}
  .lang-pick{padding-inline:10px}
  .lang-full{display:none}
  .lang-short{display:inline}
  .tilt,.device-tilt,[data-tilt]{transform:none!important}
  .footer-grid{gap:28px;grid-template-columns:minmax(0,1fr)}
  .footer-brand p{max-width:none}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal-ready .reveal:not(.shown){opacity:1;transform:none}
}