:root{
  --color-bg:#FBF2E2;
  --color-panel:#FFFAF0;
  --color-panel-alt:#F4E6CE;
  --color-border:#E5D3B6;
  --color-accent:#DE3E12;
  --color-accent-dark:#B22F0B;
  --color-accent-soft:#F8D8C8;
  --color-text:#2E2015;
  --color-muted:#7A6A55;
  --color-success:#1E7A4C;
  --color-success-soft:#DCEBE0;
  --color-warning:#C98A00;
  --color-warning-soft:#F5E7C8;
  --color-error:#B3261E;
  --color-white:#FFFFFF;
  --color-shadow:#E9D6B4;
  --color-shadow-soft:#F3E7CF;
  --color-overlay:#2E2015CC;
  --color-flag-red:#CE3B2E;
  --color-flag-blue:#2C4F8F;
  --color-flag-green:#2F8F5B;
  --color-flag-white:#FFFDF6;
  --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,'Liberation Mono','Courier New',monospace;
  --radius-xs:5px;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-pill:999px;
  --shadow-button:4px 5px 0 var(--color-shadow);
  --shadow-card:8px 9px 0 var(--color-shadow);
  --shadow-device:14px 16px 0 var(--color-shadow),30px 34px 0 var(--color-shadow-soft);
  --header-height:64px;
  --content-width:1200px;
  --wide-width:1360px;
  --text-width:780px;
  --gutter:clamp(16px,4vw,32px);
  --section-space:clamp(64px,9vw,112px);
  --focus-ring:2px solid var(--color-accent);
  --toc-offset:112px;
  --transition-fast:160ms ease;
  --transition-main:360ms cubic-bezier(.22,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{
  font-size:16px;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-height) + 16px);
}
html.nav-open{overflow:hidden}
body{
  margin:0;
  min-width:320px;
  overflow-x:hidden;
  color:var(--color-text);
  background-color:var(--color-bg);
  font-family:var(--font-body);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  position:fixed;
  inset:0;
  z-index:-1;
  content:"";
  pointer-events:none;
  opacity:.45;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.05'/%3E%3C/svg%3E");
}
img,svg,video{display:block;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
p,ul,ol,blockquote,pre,figure{margin:0}
ul,ol{padding:0}
ul{list-style:none}
h1,h2,h3,h4{
  margin:0;
  color:var(--color-text);
  font-family:var(--font-display);
  line-height:1.15;
  text-wrap:balance;
}
h1,.hero-title{
  font-size:clamp(52px,5.6vw,72px);
  font-weight:900;
  letter-spacing:-.015em;
}
h2{font-size:clamp(34px,4vw,52px);font-weight:900;letter-spacing:-.01em}
h3{font-size:clamp(22px,2.4vw,30px);font-weight:800}
h4{font-size:18px;font-weight:800}
p{overflow-wrap:break-word}
strong{font-weight:800;color:var(--color-text)}
code,kbd,samp{font-family:var(--font-mono)}
:not(pre)>code{
  padding:.12em .35em;
  border:1px solid var(--color-border);
  border-radius:var(--radius-xs);
  background:var(--color-panel-alt);
  overflow-wrap:anywhere;
}
pre{
  max-width:100%;
  overflow-x:auto;
  padding:20px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);
  background:var(--color-text);
  color:var(--color-panel);
  -webkit-overflow-scrolling:touch;
}
pre code{white-space:pre}
::selection{background:var(--color-accent-soft);color:var(--color-text)}
:where(a,button,input,select,textarea,summary,[role="tab"]):focus-visible{
  outline:var(--focus-ring);
  outline-offset:3px;
}
.no-break{white-space:nowrap}
.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}
.wrap,.wrap-wide,.prose-wrap{
  width:100%;
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-width:0;
}
.wrap{max-width:calc(var(--content-width) + var(--gutter) * 2)}
.wrap-wide{max-width:calc(var(--wide-width) + var(--gutter) * 2)}
.prose-wrap{max-width:calc(var(--text-width) + var(--gutter) * 2)}
.section{
  padding-top:var(--section-space);
  padding-bottom:var(--section-space);
  overflow-x:clip;
}
.section-alt{background:var(--color-panel)}
.section-head{max-width:800px;margin-bottom:clamp(30px,5vw,56px)}
.section-head p{margin-top:18px;color:var(--color-muted);font-size:18px}
.kicker{
  margin-bottom:14px;
  color:var(--color-accent);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.accent-text{color:var(--color-accent)}
.muted{color:var(--color-muted)}
.center{text-align:center}
.stack{display:grid;gap:20px;min-width:0}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:12px;min-width:0}
.btn{
  display:inline-flex;
  min-width:24px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 27px;
  border:1.5px solid transparent;
  border-radius:var(--radius-sm);
  font-size:15px;
  font-weight:800;
  line-height:1.1;
  text-align:center;
  transition:background-color var(--transition-fast),color var(--transition-fast),transform var(--transition-fast);
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{
  color:var(--color-white);
  background:var(--color-accent);
  box-shadow:var(--shadow-button);
}
.btn-primary:hover{background:var(--color-accent-dark)}
.btn-secondary{
  border-color:var(--color-text);
  color:var(--color-text);
  background:transparent;
}
.btn-secondary:hover{background:var(--color-panel-alt)}
.btn-soft{
  color:var(--color-accent-dark);
  background:var(--color-accent-soft);
}
.btn-small{min-height:38px;padding:9px 18px;font-size:13px}
.btn[aria-disabled="true"],.btn:disabled{cursor:not-allowed;opacity:.55;transform:none}
.panel,.card{
  min-width:0;
  border:1px solid var(--color-border);
  border-radius:var(--radius-md);
  background:var(--color-panel);
}
.card{padding:26px;transition:transform var(--transition-fast),background-color var(--transition-fast)}
.card:hover{transform:translateY(-3px);background:var(--color-panel-alt)}
.badge,.chip{
  display:inline-flex;
  max-width:100%;
  min-height:28px;
  align-items:center;
  gap:7px;
  padding:5px 11px;
  overflow:hidden;
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  line-height:1.2;
}
.badge{color:var(--color-accent-dark);background:var(--color-accent-soft)}
.badge-success{color:var(--color-success);background:var(--color-success-soft)}
.badge-warning{color:var(--color-warning);background:var(--color-warning-soft)}
.chip{border:1px solid var(--color-border);background:var(--color-panel)}
.status-dot{
  width:7px;
  height:7px;
  flex-shrink:0;
  border-radius:50%;
  background:var(--color-success);
}
.icon-box{
  display:inline-grid;
  width:38px;
  height:38px;
  flex-shrink:0;
  place-items:center;
  border-radius:var(--radius-sm);
  color:var(--color-accent);
  background:var(--color-accent-soft);
}
.icon-box svg{width:20px;height:20px}
.reveal{transition:opacity .58s ease,transform .58s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}

/* Shared header */
.site-head{
  position:relative;
  z-index:50;
  height:var(--header-height);
  border-bottom:1px solid var(--color-border);
  background:var(--color-bg);
}
.head-in{
  display:flex;
  width:100%;
  max-width:var(--wide-width);
  height:100%;
  margin:auto;
  padding-inline:28px;
  align-items:center;
  gap:18px;
}
.brand{
  display:flex;
  min-width:max-content;
  min-height:44px;
  align-items:center;
  gap:10px;
  margin-right:7px;
}
.brand img{width:30px;height:30px}
.brand-name{font-size:19px;font-weight:800;letter-spacing:.02em}
.brand-local{color:var(--color-muted);font-size:14px;font-weight:600}
.main-nav{display:flex;flex:1;align-items:center;gap:2px;min-width:0}
.main-nav a{
  display:flex;
  min-height:40px;
  align-items:center;
  gap:6px;
  padding:8px 10px;
  border-radius:var(--radius-sm);
  font-size:13px;
  font-weight:650;
  white-space:nowrap;
}
.main-nav a svg{width:15px;height:15px;color:var(--color-muted)}
.main-nav a:hover{background:var(--color-panel-alt)}
.main-nav a.is-active{color:var(--color-accent)}
.main-nav a.is-active svg{color:var(--color-accent)}
.head-tools{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
}
.lang-menu{position:relative}
.lang-trigger{
  display:inline-flex;
  min-width:44px;
  min-height:44px;
  align-items:center;
  gap:6px;
  padding:8px;
  border:0;
  background:transparent;
  color:var(--color-muted);
  font-size:13px;
  white-space:nowrap;
}
.lang-pop{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  z-index:70;
  display:none;
  width:164px;
  padding:7px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);
  background:var(--color-panel);
  box-shadow:var(--shadow-card);
}
.lang-menu.is-open .lang-pop{display:grid}
.lang-pop a{display:flex;min-height:40px;align-items:center;padding:7px 10px;border-radius:var(--radius-xs);font-size:13px}
.lang-pop a:hover,.lang-pop a[aria-current="true"]{color:var(--color-accent);background:var(--color-panel-alt)}
.btn-login{
  display:inline-flex;
  min-height:40px;
  align-items:center;
  padding:7px 18px;
  border:1.5px solid var(--color-text);
  border-radius:var(--radius-sm);
  font-size:13px;
  font-weight:800;
  white-space:nowrap;
}
.btn-login:hover{color:var(--color-panel);background:var(--color-text)}
.menu-toggle{
  display:none;
  width:44px;
  min-width:44px;
  height:44px;
  min-height:44px;
  padding:10px;
  border:0;
  border-radius:var(--radius-sm);
  background:transparent;
}
.menu-toggle span,.menu-toggle::before,.menu-toggle::after{
  display:block;
  width:22px;
  height:2px;
  content:"";
  background:var(--color-text);
  transition:transform var(--transition-fast),opacity var(--transition-fast);
}
.menu-toggle span{margin:5px 0}
.menu-toggle[aria-expanded="true"]::before{transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span{opacity:0}
.menu-toggle[aria-expanded="true"]::after{transform:translateY(-7px) rotate(-45deg)}
.mobile-nav{
  position:absolute;
  top:var(--header-height);
  right:0;
  left:0;
  z-index:60;
  display:none;
  max-height:calc(100dvh - var(--header-height));
  overflow-y:auto;
  padding:12px var(--gutter) 22px;
  border-top:1px solid var(--color-border);
  border-bottom:1px solid var(--color-border);
  background:var(--color-panel);
  overscroll-behavior:contain;
}
.mobile-nav.is-open{display:block}
.mobile-nav ul{display:grid;gap:3px}
.mobile-nav a{
  display:flex;
  width:100%;
  min-height:46px;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border-radius:var(--radius-sm);
  font-weight:700;
}
.mobile-nav a svg{width:17px;height:17px;color:var(--color-muted)}
.mobile-nav a:hover,.mobile-nav a.is-active{color:var(--color-accent);background:var(--color-panel-alt)}
.mobile-lang-list{margin-top:12px;padding-top:12px;border-top:1px solid var(--color-border)}
.nav-veil{
  position:fixed;
  inset:var(--header-height) 0 0;
  z-index:40;
  display:none;
  border:0;
  background:var(--color-overlay);
}
.nav-veil.is-open{display:block}

/* Shared footer */
.site-footer{
  position:relative;
  z-index:1;
  border-top:1px solid var(--color-border);
  background:var(--color-panel-alt);
}
.footer-main{
  display:grid;
  grid-template-columns:minmax(240px,1.25fr) repeat(3,minmax(150px,1fr));
  gap:42px;
  padding-top:62px;
  padding-bottom:44px;
}
.footer-brand p{max-width:340px;margin-top:16px;color:var(--color-muted)}
.footer-title{margin-bottom:15px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--color-accent)}
.footer-links{display:grid;gap:8px}
.footer-links a{display:inline-flex;min-height:30px;align-items:center;color:var(--color-muted);font-size:14px}
.footer-links a:hover{color:var(--color-accent)}
.footer-hot{display:flex;flex-wrap:wrap;gap:7px}
.footer-hot a{
  display:inline-flex;
  min-height:30px;
  align-items:center;
  padding:5px 9px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-pill);
  background:var(--color-panel);
  color:var(--color-muted);
  font-size:12px;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:18px;
  padding-top:20px;
  padding-bottom:24px;
  border-top:1px solid var(--color-border);
  color:var(--color-muted);
  font-size:12px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{min-height:24px}

.prose{min-width:0;color:var(--color-text)}
.prose>*+*{margin-top:1.25em}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.8em}
.prose ul{padding-left:1.25em;list-style:disc}
.prose ol{padding-left:1.4em}
.prose li+li{margin-top:.5em}
.prose a:not(.btn){color:var(--color-accent);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--radius-sm)}
.prose table{border-collapse:collapse}
.prose th,.prose td{padding:12px;border:1px solid var(--color-border);text-align:left}
.prose th{background:var(--color-panel-alt);color:var(--color-text)}

@media (max-width:1120px){
  .main-nav a{padding-inline:7px;font-size:12px}
  .head-in{padding-inline:20px;gap:10px}
  .lang-trigger span{display:none}
}
@media (max-width:940px){
  .main-nav,.desktop-lang{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:block}
  .footer-main{grid-template-columns:1.3fr 1fr 1fr}
  .footer-main>div:last-child{grid-column:2/4}
}
@media (max-width:768px){
  h1,.hero-title{font-size:clamp(28px,9.8vw,40px);line-height:1.12;letter-spacing:-.01em}
  h2{font-size:clamp(29px,8vw,40px)}
  .section{padding-top:64px;padding-bottom:64px}
  .footer-main{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .footer-main>div:last-child{grid-column:auto}
}
@media (max-width:640px){
  :root{--gutter:16px}
  .head-in{padding-inline:16px}
  .brand-name{font-size:17px}
  .brand-local{display:none}
  .btn-login{padding-inline:12px}
  .lang-trigger{padding-inline:4px}
  .lang-trigger span{display:none}
  .footer-main{grid-template-columns:1fr;gap:28px;padding-top:48px}
  .footer-brand,.footer-main>div:last-child{grid-column:auto}
  .footer-bottom{display:grid}
  .tilt,.device,.tilted-card,[class*="tilt-"]{transform:none!important}
  .decor-absolute,.hero-watermark{display:none!important}
  .card{padding:20px}
  .btn{width:100%}
  .cluster.mobile-stack{display:grid}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}
@media print{
  body::before,.site-head,.site-footer,.float-cta{display:none!important}
  body{background:var(--color-white)}
}