:root{
  --color-bg:#FFFFFF;
  --color-panel:#F4F8F9;
  --color-panel-strong:#E8F1F3;
  --color-border:#D9E3E6;
  --color-accent:#F2521B;
  --color-accent-dark:#C93D0F;
  --color-text:#14404C;
  --color-muted:#5B7078;
  --color-success:#1D9E6F;
  --color-warn:#E2A81C;
  --color-error:#D6392E;
  --color-teal:#2A6B7C;
  --color-teal-soft:#7FB0BC;
  --color-grid:#CBDDE2;
  --color-white:#FFFFFF;
  --color-black:#20242A;
  --color-flag-red:#D0342C;
  --color-flag-navy:#3C3B6E;
  --color-flag-green:#009246;
  --color-flag-gold:#F7CE00;
  --font-display:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,'Courier New',monospace;
  --radius-sm:10px;
  --radius-md:14px;
  --radius-lg:28px;
  --radius-pill:999px;
  --shadow-card:0 1px 2px rgba(20,64,76,.05),0 14px 34px -14px rgba(20,64,76,.16),0 34px 70px -34px rgba(20,64,76,.14);
  --shadow-chip:0 1px 2px rgba(20,64,76,.06),0 10px 26px -10px rgba(20,64,76,.22);
  --shadow-button:0 8px 22px -8px rgba(242,82,27,.55);
  --header-height:68px;
  --content-width:1240px;
  --wide-width:1360px;
  --reading-width:780px;
  --gutter:clamp(16px,3.2vw,40px);
  --section-space:clamp(64px,8vw,112px);
  --focus-size:2px;
  --transition-fast:150ms ease;
}
*,
*::before,
*::after{box-sizing:border-box}
html{
  background:var(--color-bg);
  color:var(--color-text);
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-height) + 16px);
  overflow-wrap:break-word;
}
html.nav-open{overflow:hidden}
body{
  margin:0;
  min-width:320px;
  background:var(--color-bg);
  color:var(--color-text);
  font-family:var(--font-body);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:clip;
}
img,svg,video{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,ul,ol,dl,blockquote,pre,figure{margin:0}
ul,ol{padding-left:1.25em}
h1,h2,h3,h4{
  margin:0;
  color:var(--color-text);
  font-family:var(--font-display);
  line-height:1.18;
  text-wrap:balance;
}
h1{font-size:clamp(52px,5vw,72px);font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(32px,3.2vw,48px);font-weight:800;letter-spacing:-.018em}
h3{font-size:clamp(22px,2vw,28px);font-weight:750}
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-border);
  border-radius:var(--radius-md);
  background:var(--color-panel);
}
.no-break{white-space:nowrap}
.wrap{
  width:100%;
  max-width:var(--content-width);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.wrap-wide{
  width:100%;
  max-width:var(--wide-width);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.reading-column{
  width:100%;
  max-width:var(--reading-width);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-tight{padding-top:64px;padding-bottom:64px}
.panel{
  min-width:0;
  border:1px solid var(--color-border);
  border-radius:var(--radius-lg);
  background:var(--color-panel);
}
.card{
  min-width:0;
  border:1px solid var(--color-border);
  border-radius:var(--radius-lg);
  background:var(--color-bg);
  box-shadow:var(--shadow-card);
}
.eyebrow{
  color:var(--color-teal);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  max-width:100%;
  min-height:28px;
  padding:4px 12px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-pill);
  background:var(--color-bg);
  color:var(--color-muted);
  font-size:13px;
  font-weight:650;
  overflow:hidden;
}
.badge-dot{
  width:7px;
  height:7px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--color-success);
}
.btn{
  display:inline-flex;
  min-height:48px;
  min-width:24px;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 26px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-weight:750;
  line-height:1.2;
  text-align:center;
  transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast),transform var(--transition-fast);
}
.btn-primary{
  border-color:var(--color-accent);
  background:var(--color-accent);
  color:var(--color-white);
  box-shadow:var(--shadow-button);
}
.btn-primary:hover{border-color:var(--color-accent-dark);background:var(--color-accent-dark);transform:translateY(-1px)}
.btn-secondary{
  border-color:var(--color-text);
  background:var(--color-bg);
  color:var(--color-text);
}
.btn-secondary:hover{background:var(--color-panel)}
.btn-soft{
  border-color:var(--color-border);
  background:var(--color-panel-strong);
  color:var(--color-text);
}
.btn:disabled,.btn.is-disabled{cursor:not-allowed;opacity:.55;transform:none}
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="tab"]:focus-visible{
  outline:var(--focus-size) solid var(--color-accent);
  outline-offset:3px;
}
.site-header{
  position:relative;
  z-index:80;
  border-bottom:1px solid var(--color-border);
  background:var(--color-bg);
}
.header-inner{
  width:100%;
  max-width:var(--wide-width);
  height:var(--header-height);
  margin-inline:auto;
  padding-inline:28px;
  display:flex;
  align-items:center;
  gap:24px;
}
.brand{
  display:flex;
  min-height:44px;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.brand-logo{width:34px;height:34px;flex:0 0 auto}
.brand-name{font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand-local{color:var(--color-muted);font-size:14px;font-weight:600}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:8px}
.main-nav a{
  display:flex;
  min-height:36px;
  align-items:center;
  padding:6px 12px;
  border-radius:var(--radius-pill);
  color:var(--color-muted);
  font-size:14px;
  font-weight:550;
  white-space:nowrap;
}
.main-nav a:hover{background:var(--color-panel);color:var(--color-text)}
.main-nav a.is-active{background:var(--color-panel-strong);color:var(--color-text);font-weight:750}
.header-tools{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.language-wrap{position:relative}
.language-button{
  display:inline-flex;
  min-width:44px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  gap:5px;
  padding:6px 8px;
  border:0;
  background:transparent;
  color:var(--color-muted);
  font-size:13px;
}
.language-menu{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  z-index:95;
  display:none;
  width:156px;
  padding:8px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-md);
  background:var(--color-bg);
  box-shadow:var(--shadow-chip);
}
.language-wrap.is-open .language-menu{display:block}
.language-menu a{
  display:flex;
  min-height:40px;
  align-items:center;
  padding:7px 10px;
  border-radius:var(--radius-sm);
  font-size:13px;
}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--color-panel-strong)}
.login-button{
  display:inline-flex;
  min-height:40px;
  align-items:center;
  padding:8px 21px;
  border-radius:var(--radius-pill);
  background:var(--color-text);
  color:var(--color-white);
  font-size:14px;
  font-weight:750;
}
.login-button:hover{background:var(--color-teal)}
.menu-toggle{
  display:none;
  min-width:44px;
  min-height:44px;
  padding:10px;
  border:0;
  border-radius:var(--radius-sm);
  background:var(--color-panel);
}
.menu-toggle svg{width:22px;height:22px}
.mobile-nav{
  position:absolute;
  top:var(--header-height);
  left:0;
  right:0;
  z-index:92;
  display:none;
  max-height:calc(100dvh - var(--header-height));
  padding:12px var(--gutter) 20px;
  overflow-y:auto;
  overscroll-behavior:contain;
  border-bottom:1px solid var(--color-border);
  background:var(--color-bg);
  box-shadow:var(--shadow-card);
}
.mobile-nav.is-open{display:block}
.mobile-nav a{
  display:flex;
  width:100%;
  min-height:48px;
  align-items:center;
  padding:11px 14px;
  border-radius:var(--radius-sm);
  color:var(--color-muted);
  font-weight:650;
}
.mobile-nav a:hover,.mobile-nav a.is-active{background:var(--color-panel-strong);color:var(--color-text)}
.mobile-languages{margin-top:10px;padding-top:10px;border-top:1px solid var(--color-border)}
.nav-veil{
  position:fixed;
  inset:var(--header-height) 0 0;
  z-index:70;
  display:none;
  border:0;
  background:rgba(20,64,76,.18);
}
.nav-veil.is-open{display:block}
.site-footer{
  margin-top:var(--section-space);
  border-top:1px solid var(--color-border);
  background:var(--color-panel);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.25fr 1fr 1fr 1fr;
  gap:48px;
  padding-top:64px;
  padding-bottom:48px;
}
.footer-brand p{max-width:340px;margin-top:16px;color:var(--color-muted)}
.footer-title{margin-bottom:14px;font-size:14px;font-weight:800}
.footer-links{display:grid;gap:8px}
.footer-links a{
  width:max-content;
  max-width:100%;
  min-height:28px;
  color:var(--color-muted);
  font-size:14px;
}
.footer-links a:hover{color:var(--color-text)}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  gap:20px;
  padding-top:22px;
  padding-bottom:28px;
  border-top:1px solid var(--color-border);
  color:var(--color-muted);
  font-size:13px;
}
.footer-legal,.footer-languages{display:flex;flex-wrap:wrap;gap:14px}
.reveal{transition:opacity .65s ease,transform .65s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
body:has(.toc-tabs) section[id]{scroll-margin-top:132px}
.prose>*+*{margin-top:1.2em}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.7em}
.prose a:not(.btn){color:var(--color-accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--radius-md)}
@media (max-width:1120px){
  .site-header{z-index:120}
  .mobile-nav{position:fixed}
  .main-nav{display:none}
  .menu-toggle{display:inline-flex;align-items:center;justify-content:center}
  .header-tools{margin-left:auto}
  .language-wrap{display:none}
}
@media (max-width:768px){
  h1{font-size:clamp(28px,9.5vw,40px);line-height:1.12}
  h2{font-size:clamp(28px,8vw,36px)}
  .header-inner{padding-inline:var(--gutter);gap:8px}
  .brand-local{display:none}
  .login-button{padding-inline:16px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-bottom{flex-direction:column}
}
@media (max-width:640px){
  .mobile-nav a{min-height:44px;padding-block:8px}
  .mobile-languages{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px}
  .mobile-languages a{min-height:40px}
  .wrap,.wrap-wide,.reading-column{padding-inline:var(--gutter)}
  .footer-grid{grid-template-columns:1fr}
  .btn{width:100%}
  .tilt-card,.decorative-tilt,[data-tilt]{transform:none!important}
  .absolute-decor,.hero-orb,.watermark-decor{display:none!important}
  table{max-width:100%}
}
@media (max-width:390px){
  .brand-name{font-size:17px}
  .login-button{padding-inline:13px}
  .header-inner{gap:5px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}