:root{
  --color-page:#FBFCF7;
  --color-panel:#FFFFFF;
  --color-panel-soft:#EFF3E4;
  --color-line:#DFE5D2;
  --color-accent:#8FBE21;
  --color-accent-deep:#5F8A12;
  --color-text:#1A211A;
  --color-muted:#5C665A;
  --color-success:#3E9B4F;
  --color-warning:#D99A1B;
  --color-error:#C7432F;
  --color-dark:#131A12;
  --color-dark-panel:#1B241B;
  --color-dark-raised:#222D21;
  --color-dark-line:rgba(255,255,255,.09);
  --color-dark-text:#E9EFE2;
  --color-dark-muted:#93A08D;
  --color-white:#FFFFFF;
  --color-focus:#5F8A12;
  --color-glow:rgba(143,190,33,.20);
  --color-accent-soft:rgba(143,190,33,.14);
  --color-shadow:rgba(19,26,18,.26);
  --color-shadow-strong:rgba(19,26,18,.42);
  --color-button-shadow:rgba(95,138,18,.55);
  --color-flag-blue:#33549C;
  --color-flag-navy:#283158;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',-apple-system,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',-apple-system,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --radius-xs:5px;
  --radius-sm:8px;
  --radius-md:14px;
  --radius-pill:999px;
  --header-height:68px;
  --toc-height:58px;
  --content-width:1360px;
  --reading-width:800px;
  --gutter:clamp(16px,3vw,40px);
  --section-space:clamp(72px,9vw,128px);
  --shadow-window:0 42px 72px -30px var(--color-shadow-strong),0 16px 32px -16px var(--color-shadow);
  --shadow-button:0 8px 18px -8px var(--color-button-shadow);
  --shadow-card:0 22px 54px -38px var(--color-shadow-strong);
  --transition-fast:150ms ease;
  --transition-reveal:600ms cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior: smooth;scroll-padding-top:calc(var(--header-height) + 16px);background:var(--color-page);color:var(--color-text);font-family:var(--font-body);-webkit-text-size-adjust:100%}
html.nav-open{overflow:hidden}
body{margin:0;min-width:320px;background:var(--color-page);color:var(--color-text);font-family:var(--font-body);line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:clip}
main,section,article,aside,header,footer,nav,div{min-width:0}
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,h1,h2,h3,h4,ul,ol,figure,blockquote{margin-top:0}
ul,ol{padding-left:1.25rem}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow:auto;padding:20px;background:var(--color-dark);color:var(--color-dark-text);border-radius:var(--radius-sm);-webkit-overflow-scrolling:touch}
table{border-collapse:collapse}
summary{cursor:pointer}
:focus-visible{outline:2px solid var(--color-focus);outline-offset:3px}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{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);overflow-x:clip}
.section-tight{padding-top:clamp(48px,6vw,80px);padding-bottom:clamp(48px,6vw,80px);overflow-x:clip}
.section-dark{background-color:var(--color-dark);color:var(--color-dark-text);background-image:radial-gradient(var(--color-dark-line) 1px,transparent 1.4px);background-size:13px 13px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;min-height:30px;max-width:100%;padding:3px 13px;border:1px solid var(--color-line);border-radius:var(--radius-pill);background:var(--color-panel);color:var(--color-muted);font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;overflow:hidden}
.eyebrow-dot{width:7px;height:7px;flex:0 0 auto;border-radius:50%;background:var(--color-success)}
h1,h2,h3{font-family:var(--font-display);color:var(--color-text);text-wrap:balance;overflow-wrap:normal}
h1{font-size:clamp(52px,5vw,68px);line-height:1.1;letter-spacing:-.02em;font-weight:900}
h2{font-size:clamp(36px,4vw,54px);line-height:1.14;letter-spacing:-.018em;font-weight:900}
h3{font-size:clamp(22px,2.2vw,30px);line-height:1.25;font-weight:800}
.lead{font-size:clamp(18px,2vw,22px);line-height:1.7;color:var(--color-muted)}
.muted{color:var(--color-muted)}
.accent-text{color:var(--color-accent-deep)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.btn,.btn-primary,.btn-secondary,.btn-dark,.btn-small{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-width:24px;min-height:44px;padding:10px 24px;border-radius:var(--radius-sm);
  border:1px solid transparent;font-weight:700;line-height:1.2;text-align:center;
  transition:background-color var(--transition-fast),color var(--transition-fast),border-color var(--transition-fast),transform var(--transition-fast)
}
.btn:hover,.btn-primary:hover,.btn-secondary:hover,.btn-dark:hover,.btn-small:hover{transform:translateY(-1px)}
.btn-primary{background:var(--color-accent);color:var(--color-dark);box-shadow:var(--shadow-button)}
.btn-primary:hover{background:var(--color-accent-deep);color:var(--color-white)}
.btn-secondary{background:transparent;color:var(--color-text);border-color:var(--color-text)}
.btn-secondary:hover{background:var(--color-panel-soft)}
.btn-dark{background:var(--color-dark);color:var(--color-dark-text)}
.btn-dark:hover{background:var(--color-dark-raised)}
.btn-small{min-height:38px;padding:8px 18px;font-size:14px}
.button-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.panel,.card{background:var(--color-panel);border:1px solid var(--color-line);border-radius:var(--radius-md)}
.card{padding:clamp(22px,3vw,34px);box-shadow:var(--shadow-card)}
.grid-2,.grid-3,.grid-4,.grid-5{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.reveal{transition:opacity var(--transition-reveal),transform var(--transition-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:translateY(0)}
.site-header{height:var(--header-height);position:relative;z-index:100}
.topbar{height:var(--header-height);background:var(--color-page);border-bottom:1px solid var(--color-line);position:relative;z-index:3}
.topbar-inner{max-width:var(--content-width);height:100%;margin-inline:auto;padding-inline:var(--gutter);display:flex;align-items:center;gap:30px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;min-height:44px}
.brand-logo{width:32px;height:32px;flex:0 0 auto}
.brand-name{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:.01em}
.brand-local{color:var(--color-muted);font-size:13px;font-weight:500}
.desktop-tabs{height:100%;display:flex;align-items:stretch;gap:2px;flex:1}
.nav-tab{position:relative;display:flex;align-items:center;padding-inline:11px;white-space:nowrap;color:var(--color-muted);font-size:14px}
.nav-tab:hover,.nav-tab.is-active{color:var(--color-text)}
.nav-tab.is-active{font-weight:700}
.nav-tab.is-active::after{content:"";position:absolute;left:10px;right:10px;bottom:-1px;height:3px;border-radius:2px 2px 0 0;background:var(--color-text)}
.header-tools{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.language-wrap{position:relative}
.language-button,.menu-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:44px;min-height:44px;padding:6px 8px;border:0;background:transparent;color:var(--color-muted)}
.language-button svg{width:9px;height:6px}
.language-menu{position:absolute;right:0;top:calc(100% + 8px);width:154px;padding:7px;background:var(--color-panel);border:1px solid var(--color-line);border-radius:var(--radius-sm);box-shadow:var(--shadow-card);visibility:hidden;opacity:0;transform:translateY(-4px);transition:opacity var(--transition-fast),transform var(--transition-fast),visibility var(--transition-fast)}
.language-wrap.is-open .language-menu{visibility:visible;opacity:1;transform:none}
.language-menu a{display:flex;align-items:center;min-height:42px;padding:8px 11px;border-radius:var(--radius-xs);font-size:14px}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--color-panel-soft)}
.login-button{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:7px 21px;border:1.5px solid var(--color-text);border-radius:var(--radius-sm);font-size:14px;font-weight:700}
.login-button:hover{background:var(--color-text);color:var(--color-page)}
.menu-button{display:none}
.menu-button svg{width:23px;height:23px}
.mobile-drawer{display:none}
.nav-veil{display:none}
.site-footer{background:var(--color-dark);color:var(--color-dark-text);background-image:radial-gradient(var(--color-dark-line) 1px,transparent 1.4px);background-size:13px 13px}
.footer-inner{padding-top:72px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:minmax(240px,1.25fr) repeat(3,minmax(150px,1fr));gap:48px}
.footer-brand p{max-width:390px;color:var(--color-dark-muted)}
.footer-brand .brand-name{color:var(--color-dark-text)}
.footer-brand .brand-local{color:var(--color-dark-muted)}
.footer-title{margin-bottom:14px;color:var(--color-dark-text);font-size:13px;letter-spacing:.08em}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--color-dark-muted);font-size:14px}
.footer-links a:hover{color:var(--color-accent)}
.footer-bottom{margin-top:52px;padding-top:22px;border-top:1px solid var(--color-dark-line);display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;color:var(--color-dark-muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
@media (max-width:1180px){
  .desktop-tabs{display:none}
  .header-tools{margin-left:auto}
  .menu-button{display:inline-flex}
  .mobile-drawer{display:block;position:absolute;left:0;right:0;top:var(--header-height);z-index:4;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:10px var(--gutter) 22px;background:var(--color-page);border-bottom:1px solid var(--color-line);visibility:hidden;opacity:0;transform:translateY(-8px);pointer-events:none;transition:opacity var(--transition-fast),transform var(--transition-fast),visibility var(--transition-fast)}
  .site-header.is-open .mobile-drawer{visibility:visible;opacity:1;transform:none;pointer-events:auto}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 8px;border-bottom:1px solid var(--color-line)}
  .mobile-drawer a.is-active{color:var(--color-accent-deep);font-weight:700}
  .mobile-language-title{margin:16px 8px 5px;color:var(--color-muted);font-size:12px;letter-spacing:.06em}
  .nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:2;background:var(--color-shadow);border:0;width:100%;height:auto}
  .site-header.is-open .nav-veil{display:block}
  .grid-4,.grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:768px){
  h1{font-size:clamp(28px,9vw,40px);line-height:1.12;letter-spacing:-.015em}
  h2{font-size:clamp(28px,7vw,38px)}
  .grid-2,.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:640px){
  .no-break{white-space:normal}
  .tilt,.client-window{transform:none!important}
  .brand-local,.language-button span{display:none}
  .header-tools{gap:3px;margin-left:auto}
  .login-button{padding-inline:14px}
  .button-row>.btn,.button-row>.btn-primary,.button-row>.btn-secondary{flex:1 1 140px}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-brand{grid-column:auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:0s!important;animation-iteration-count:1!important;transition-duration:0s!important}
  .reveal,.reveal.pending{opacity:1!important;transform:none!important}
}