:root{
  --color-canvas:#FFFFFF;
  --color-panel:#101114;
  --color-panel-raised:#1A1C20;
  --color-line:#E4E4E2;
  --color-signal:#FF6200;
  --color-signal-deep:#CC4E00;
  --color-ink:#141518;
  --color-ink-soft:#64676D;
  --color-ok:#1F9D55;
  --color-warn:#E5A100;
  --color-error:#D93025;
  --color-paper-soft:#F5F5F3;
  --color-paper-warm:#FAFAF8;
  --color-white:#FFFFFF;
  --color-shadow-soft:rgba(16,17,20,.10);
  --color-shadow-faint:rgba(16,17,20,.06);
  --color-signal-shadow:rgba(255,98,0,.24);
  --color-signal-shadow-strong:rgba(255,98,0,.32);
  --color-dark-line:rgba(255,255,255,.14);
  --color-dark-soft:rgba(255,255,255,.62);
  --color-dark-faint:rgba(255,255,255,.45);
  --color-grid:rgba(20,21,24,.06);
  --font-display:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Hiragino Sans','Malgun Gothic','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Hiragino Sans','Malgun Gothic','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --radius-xs:4px;
  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:20px;
  --radius-pill:999px;
  --header-height:72px;
  --content-max:1360px;
  --reading-max:820px;
  --gutter:clamp(16px,4vw,48px);
  --section-space:clamp(64px,9vw,124px);
  --focus-width:2px;
  --toc-offset:132px;
  --shadow-menu:0 12px 32px var(--color-shadow-soft),0 2px 6px var(--color-shadow-faint);
  --shadow-signal:0 6px 18px var(--color-signal-shadow);
}
*,*::before,*::after{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-height) + 16px);
  background:var(--color-canvas);
}
html.nav-open{overflow:hidden}
body{
  margin:0;
  min-width:320px;
  background:var(--color-canvas);
  color:var(--color-ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
}
body:has(.float-cta)::after{
  content:"";
  display:block;
  height:calc(88px + env(safe-area-inset-bottom,0px));
}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
p,h1,h2,h3,h4,ul,ol,dl,dd,blockquote,figure{margin-top:0}
ul[role="list"],ol[role="list"],.plain-list{margin:0;padding:0;list-style:none}
table{border-collapse:collapse}
code,kbd,samp,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{
  max-width:100%;
  overflow-x:auto;
  padding:20px;
  border:1px solid var(--color-line);
  border-radius:var(--radius-sm);
  background:var(--color-panel);
  color:var(--color-white);
  -webkit-overflow-scrolling:touch;
}
::selection{background:var(--color-signal);color:var(--color-white)}
.no-break{white-space:nowrap}
.wrap{
  width:100%;
  max-width:var(--content-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-width:0;
}
.reading-wrap{
  width:100%;
  max-width:var(--reading-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-width:0;
}
.section{
  padding-top:var(--section-space);
  padding-bottom:var(--section-space);
}
.section-compact{
  padding-top:clamp(40px,6vw,72px);
  padding-bottom:clamp(40px,6vw,72px);
}
.section-dark{
  background:var(--color-panel);
  color:var(--color-white);
}
.section-dark p{color:var(--color-dark-soft)}
.min-zero,.grid>*{min-width:0}
.eyebrow,.mono-label{
  font-family:var(--font-mono);
  font-size:.72rem;
  line-height:1.4;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.eyebrow{color:var(--color-ink-soft)}
h1,h2,h3,h4{
  color:var(--color-ink);
  font-family:var(--font-display);
  font-weight:500;
  line-height:1.16;
  text-wrap:balance;
}
h1,.hero-title{
  margin-bottom:22px;
  font-size:clamp(52px,5vw,72px);
  line-height:1.1;
  letter-spacing:-.015em;
}
h2{
  margin-bottom:22px;
  font-size:clamp(34px,4vw,52px);
  letter-spacing:-.012em;
}
h3{margin-bottom:14px;font-size:clamp(22px,2.4vw,30px)}
h4{margin-bottom:10px;font-size:18px}
.lead{
  max-width:720px;
  color:var(--color-ink-soft);
  font-size:clamp(18px,2vw,22px);
  line-height:1.65;
}
.muted{color:var(--color-ink-soft)}
.accent-text{color:var(--color-signal)}
.gradient-text{
  color:var(--color-signal);
  background:linear-gradient(110deg,var(--color-signal),var(--color-signal-deep));
  background-clip:text;
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}
a,button,summary,[role="tab"],input,select,textarea{touch-action:manipulation}
a:focus-visible,button:focus-visible,summary:focus-visible,[role="tab"]:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:var(--focus-width) solid var(--color-signal);
  outline-offset:3px;
}
.btn{
  display:inline-flex;
  min-width:24px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:12px 24px;
  border:1px solid transparent;
  border-radius:var(--radius-sm);
  font-size:15px;
  font-weight:600;
  line-height:1.2;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,transform .16s ease;
}
.btn-primary{
  border-color:var(--color-signal);
  background:var(--color-signal);
  color:var(--color-white);
  box-shadow:var(--shadow-signal);
}
.btn-primary:hover{border-color:var(--color-signal-deep);background:var(--color-signal-deep);transform:translateY(-1px)}
.btn-secondary{
  border-color:var(--color-ink);
  background:var(--color-canvas);
  color:var(--color-ink);
}
.btn-secondary:hover,.btn-quiet:hover{background:var(--color-paper-soft)}
.btn-dark{border-color:var(--color-panel);background:var(--color-panel);color:var(--color-white)}
.btn-dark:hover{background:var(--color-panel-raised)}
.btn-quiet{border-color:var(--color-line);background:var(--color-canvas);color:var(--color-ink)}
.btn[aria-disabled="true"],.btn:disabled{cursor:not-allowed;opacity:.55;transform:none}
.button-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.badge,.chip{
  display:inline-flex;
  max-width:100%;
  min-height:28px;
  align-items:center;
  gap:8px;
  padding:5px 11px;
  overflow:hidden;
  border:1px solid var(--color-line);
  border-radius:var(--radius-pill);
  background:var(--color-canvas);
  color:var(--color-ink-soft);
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.35;
  white-space:nowrap;
}
.badge-dot{width:6px;height:6px;flex-shrink:0;border-radius:50%;background:var(--color-ok)}
.badge-accent{border-color:var(--color-signal);color:var(--color-signal)}
.card,.panel{
  border:1px solid var(--color-line);
  border-radius:var(--radius-md);
  background:var(--color-canvas);
}
.card{padding:clamp(22px,3vw,34px)}
.panel{padding:clamp(24px,4vw,46px)}
.panel-dark{border-color:var(--color-dark-line);background:var(--color-panel-raised);color:var(--color-white)}
.panel-dark h2,.panel-dark h3{color:var(--color-white)}
.rule{height:1px;border:0;background:var(--color-line)}
.icon{
  width:24px;
  height:24px;
  flex-shrink:0;
  color:currentColor;
}
.site-head{
  position:sticky;
  top:0;
  z-index:80;
  height:var(--header-height);
  border-bottom:1px solid var(--color-line);
  background:var(--color-canvas);
}
.head-inner{
  width:100%;
  max-width:var(--content-max);
  height:100%;
  margin-inline:auto;
  padding-inline:var(--gutter);
  display:flex;
  align-items:center;
  gap:30px;
}
.brand{
  display:flex;
  min-width:24px;
  min-height:44px;
  align-items:center;
  gap:10px;
  flex-shrink:0;
  font-family:var(--font-display);
}
.brand-mark{width:30px;height:30px;flex-shrink:0}
.brand-name{font-size:17px;font-weight:600;letter-spacing:.02em}
.brand-local{color:var(--color-ink-soft);font-size:14px;font-weight:400}
.desktop-nav{display:flex;align-items:center;margin-left:10px}
.main-nav{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
.main-nav a,.nav-more-button{
  display:flex;
  min-height:40px;
  align-items:center;
  padding:8px 14px;
  border:0;
  border-radius:var(--radius-sm);
  background:transparent;
  color:var(--color-ink);
  font-size:14px;
  line-height:1.2;
}
.main-nav a:hover,.nav-more-button:hover,.main-nav a.is-active{background:var(--color-paper-soft)}
.main-nav a.is-active{box-shadow:inset 0 -2px var(--color-signal)}
.nav-more{position:relative}
.nav-caret{margin-left:5px;color:var(--color-ink-soft);font-size:10px}
.nav-more-menu,.language-menu{
  position:absolute;
  z-index:95;
  top:calc(100% + 8px);
  min-width:176px;
  padding:8px;
  visibility:hidden;
  opacity:0;
  transform:translateY(-4px);
  border:1px solid var(--color-line);
  border-radius:var(--radius-md);
  background:var(--color-canvas);
  box-shadow:var(--shadow-menu);
  transition:opacity .16s ease,transform .16s ease,visibility .16s ease;
}
.nav-more-menu{left:0}
.nav-more:hover .nav-more-menu,.nav-more:focus-within .nav-more-menu,.language-control.is-open .language-menu{
  visibility:visible;
  opacity:1;
  transform:translateY(0);
}
.nav-more-menu a,.language-menu a{
  display:flex;
  width:100%;
  min-height:40px;
  align-items:center;
  justify-content:space-between;
  padding:8px 11px;
  border-radius:var(--radius-sm);
  font-size:13px;
}
.nav-more-menu a:hover,.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--color-paper-soft)}
.menu-code{color:var(--color-ink-soft);font-family:var(--font-mono);font-size:10px;letter-spacing:.08em}
.head-tools{
  position:relative;
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:12px;
}
.language-control{position:relative}
.language-button{
  display:flex;
  min-width:44px;
  min-height:44px;
  align-items:center;
  gap:5px;
  padding:8px 10px;
  border:0;
  background:transparent;
  color:var(--color-ink-soft);
  font-size:13px;
}
.language-button:hover{color:var(--color-ink)}
.language-menu{right:0}
.login-button{
  display:inline-flex;
  min-height:40px;
  align-items:center;
  padding:8px 19px;
  border:1px solid var(--color-panel);
  border-radius:var(--radius-sm);
  background:var(--color-panel);
  color:var(--color-white);
  font-size:14px;
}
.login-button:hover{background:var(--color-panel-raised)}
.menu-toggle{
  display:none;
  min-width:44px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  padding:9px;
  border:1px solid var(--color-line);
  border-radius:var(--radius-sm);
  background:var(--color-canvas);
}
.menu-toggle-lines,.menu-toggle-lines::before,.menu-toggle-lines::after{
  display:block;
  width:18px;
  height:1px;
  background:var(--color-ink);
  content:"";
}
.menu-toggle-lines{position:relative}
.menu-toggle-lines::before{position:absolute;top:-6px}
.menu-toggle-lines::after{position:absolute;top:6px}
.mobile-veil{
  position:fixed;
  z-index:70;
  inset:var(--header-height) 0 0;
  display:none;
  border:0;
  background:var(--color-shadow-soft);
}
.mobile-drawer{
  position:fixed;
  z-index:90;
  top:var(--header-height);
  right:0;
  left:0;
  display:none;
  max-height:calc(100dvh - var(--header-height));
  padding:12px var(--gutter) 24px;
  overflow-y:auto;
  overscroll-behavior:contain;
  border-bottom:1px solid var(--color-line);
  background:var(--color-canvas);
}
.mobile-drawer ul{margin:0;padding:0;list-style:none}
.mobile-drawer a{
  display:flex;
  width:100%;
  min-height:48px;
  align-items:center;
  justify-content:space-between;
  padding:11px 8px;
  border-bottom:1px solid var(--color-line);
}
.mobile-drawer a.is-active{color:var(--color-signal)}
.mobile-lang-title{margin:22px 8px 6px;color:var(--color-ink-soft);font-family:var(--font-mono);font-size:10px;letter-spacing:.14em}
.site-footer{
  border-top:1px solid var(--color-dark-line);
  background:var(--color-panel);
  color:var(--color-white);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(220px,1.15fr) repeat(3,minmax(150px,1fr));
  gap:clamp(30px,5vw,72px);
  padding-top:72px;
  padding-bottom:56px;
}
.footer-brand p{max-width:360px;color:var(--color-dark-soft)}
.footer-brand .brand{margin-bottom:18px}
.footer-brand .brand-local{color:var(--color-dark-soft)}
.footer-title{
  margin-bottom:18px;
  color:var(--color-dark-faint);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.footer-links{margin:0;padding:0;list-style:none}
.footer-links li+li{margin-top:9px}
.footer-links a{
  display:inline-flex;
  min-height:28px;
  align-items:center;
  color:var(--color-dark-soft);
  font-size:14px;
}
.footer-links a:hover{color:var(--color-white)}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding-top:24px;
  padding-bottom:28px;
  border-top:1px solid var(--color-dark-line);
  color:var(--color-dark-faint);
  font-family:var(--font-mono);
  font-size:11px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.reveal{transition:opacity .62s ease,transform .62s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
[data-counter]{
  display:inline-block;
  min-width:3ch;
  font-variant-numeric:tabular-nums;
  text-align:right;
}
.prose{min-width:0;color:var(--color-ink)}
.prose h2,.prose h3{scroll-margin-top:calc(var(--header-height) + 24px)}
.prose p,.prose li{color:var(--color-ink-soft)}
.prose a{text-decoration:underline;text-decoration-color:var(--color-signal);text-underline-offset:3px}
.prose blockquote{margin-inline:0}
.prose ol{padding-left:1.4em}
.prose li+li{margin-top:.55em}
.prose > .data-table{
  display:block;
  max-width:100%;
  min-width:0;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.tilt{transform:rotate(-.35deg)}
@media (max-width:1080px){
  .desktop-nav{display:none}
  .head-tools{margin-left:auto}
  .language-control{display:none}
  .menu-toggle{display:flex}
  html.nav-open .mobile-drawer,html.nav-open .mobile-veil{display:block}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:768px){
  h1,.hero-title{font-size:clamp(28px,9.5vw,40px);line-height:1.12;letter-spacing:-.01em}
  h2{font-size:clamp(28px,8vw,38px)}
  .section{padding-top:64px;padding-bottom:64px}
  .head-inner{gap:10px}
  .brand-local{display:none}
  .login-button{padding-inline:13px}
  .button-row .btn{flex:1 1 150px}
}
@media (max-width:640px){
  .tilt{transform:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .card,.panel{padding:20px}
}
@media (max-width:390px){
  .brand-name{font-size:15px}
  .brand-mark{width:28px;height:28px}
  .login-button{padding-inline:11px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
  .btn:hover{transform:none}
}