:root {
  --bg:#FFFFFF;
  --bg-panel:#F6F7F8;
  --bg-panel-2:#EEF0F2;
  --border:#E3E6EA;
  --border-strong:#D5DADF;
  --accent:#4FA80E;
  --accent-dark:#2E6B06;
  --lemon:#E8C400;
  --teal:#0FA3A3;
  --text:#121614;
  --text-muted:#5B636B;
  --text-faint:#8A9299;
  --success:#1E9E5A;
  --warn:#D98E04;
  --error:#D93A2B;
  --on-ink:#FFFFFF;
  --accent-soft:rgba(79,168,14,.10);
  --accent-ring:rgba(79,168,14,.22);
  --success-ring:rgba(30,158,90,.28);
  --teal-soft:rgba(15,163,163,.08);
  --grid-green:rgba(79,168,14,.20);
  --grid-teal:rgba(15,163,163,.18);
  --on-dark-72:rgba(255,255,255,.74);
  --on-dark-40:rgba(255,255,255,.40);
  --on-dark-14:rgba(255,255,255,.14);
  --on-dark-08:rgba(255,255,255,.08);
  --glass:rgba(255,255,255,.94);
  --mask-solid:#000000;
  --mask-clear:rgba(0,0,0,0);
  --grad-brand:linear-gradient(96deg,var(--lemon) 0%,var(--accent) 46%,var(--teal) 100%);
  --grad-wash:radial-gradient(60% 70% at 38% 40%,var(--accent-soft) 0%,var(--mask-clear) 70%),radial-gradient(50% 60% at 68% 56%,var(--teal-soft) 0%,var(--mask-clear) 72%);
  --shadow-sm:0 1px 2px rgba(18,22,20,.06),0 2px 6px rgba(18,22,20,.05);
  --shadow-md:0 2px 4px rgba(18,22,20,.04),0 10px 20px -6px rgba(18,22,20,.10),0 22px 40px -16px rgba(18,22,20,.14);
  --shadow-lg:0 2px 6px rgba(18,22,20,.05),0 18px 36px -10px rgba(18,22,20,.16),0 44px 80px -28px rgba(18,22,20,.24);
  --shadow-xl:0 1px 2px rgba(18,22,20,.04),0 26px 50px -18px rgba(18,22,20,.16),0 64px 120px -44px rgba(18,22,20,.24);
  --shadow-pill:0 8px 18px -6px rgba(18,22,20,.40),0 2px 4px rgba(18,22,20,.18);
  --shadow-cta:0 14px 30px -12px rgba(79,168,14,.60),0 4px 10px -2px rgba(18,22,20,.24);
  --r-xs:6px;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:20px;
  --r-xl:28px;
  --r-pill:999px;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --shell:1200px;
  --stage-w:1280px;
  --gutter:24px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button{cursor:pointer}
img,svg{display:block;max-width:100%}
svg{flex-shrink:0}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;line-height:1.2}
h1{font-size:clamp(34px,4.2vw,48px);font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(26px,3vw,38px);font-weight:750}
h3{font-size:clamp(20px,2vw,26px);font-weight:700}
p{margin-bottom:1.2em}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--bg-panel);color:var(--text)}
pre code{overflow-wrap:normal;white-space:pre}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.nowrap{white-space:nowrap}
.wrap{width:100%;max-width:calc(var(--shell) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading{max-width:820px}
.section{padding-top:96px;padding-bottom:96px;overflow-x:clip}
.section--panel{background:var(--bg-panel);color:var(--text)}
.section__intro{max-width:740px;margin-bottom:40px}
.muted{color:var(--text-muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.card,.panel{min-width:0;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--r-xl);padding:28px;box-shadow:var(--shadow-sm)}
.panel{background:var(--bg-panel);color:var(--text);box-shadow:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:0 26px;border-radius:var(--r-pill);font-size:15.5px;font-weight:600;letter-spacing:-.005em;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.btn svg{width:18px;height:18px}
.btn--primary{color:var(--on-ink);border:2px solid transparent;background:linear-gradient(var(--text),var(--text)) padding-box,linear-gradient(96deg,#947800 0%,#2E6B06 46%,#087070 100%) border-box;box-shadow:var(--shadow-cta);padding-inline:20px 24px}
.btn--primary:hover{transform:translateY(-1px)}
.btn--ghost{color:var(--text);border:1.5px solid var(--border-strong);background:var(--bg);box-shadow:var(--shadow-sm)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent-dark)}
.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}
.btn__ico{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;border:1.5px solid var(--on-dark-40);flex-shrink:0}
.btn__ico svg{width:14px;height:14px}
.cta-row{display:flex;justify-content:center;align-items:center;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s ease}
.reveal.shown{opacity:1;transform:none}

/* The header has its own wider measure; it does not inherit the article measure. */
.topbar{position:relative;z-index:50;min-height:64px;background:var(--bg);color:var(--text)}
.topbar__row{max-width:min(100%,calc(1280px + var(--gutter)*2));min-height:64px;margin-inline:auto;padding-inline:var(--gutter);display:flex;align-items:center;gap:20px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font:800 17px/1.2 var(--font-display);letter-spacing:-.02em;white-space:nowrap}
.brand__mark{width:30px;height:30px;flex-shrink:0}
.mainnav{margin-left:auto;min-width:0}
.mainnav__list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.mainnav__link{display:inline-flex;align-items:center;gap:6px;padding:0 9px;min-height:36px;border-radius:var(--r-pill);color:var(--text-muted);font-size:13px;font-weight:500;white-space:nowrap;transition:background-color .18s,color .18s}
.mainnav__link svg{width:16px;height:16px}
.mainnav__link:hover{color:var(--text);background:var(--bg-panel)}
.mainnav__link[aria-current="page"]{color:var(--accent-dark);background:var(--accent-soft)}
.header-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:0 14px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--bg);color:var(--text);font-size:13.5px;font-weight:500}
.lang svg{width:15px;height:15px;color:var(--text-muted)}
.lang__short{display:none}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);width:170px;padding:6px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-md);z-index:60}
.lang-menu[hidden],.mobile-menu[hidden],.menu-veil[hidden]{display:none}
.lang-menu a{display:block;padding:9px 12px;border-radius:var(--r-sm);font-size:14px}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--accent-soft);color:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg);color:var(--text)}
.menu-toggle svg{width:22px;height:22px}
.mobile-menu{display:none}
.menu-veil{position:fixed;inset:0;z-index:40;background:var(--on-dark-14)}
.site-footer{padding-top:70px;background:var(--bg-panel);color:var(--text)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.3fr;gap:44px}
.footer-grid>*{min-width:0}
.footer-grid h2{font-size:15px;margin-bottom:18px}
.footer-grid ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-grid a:not(.brand){font-size:14px;color:var(--text-muted)}
.footer-grid a:hover{color:var(--accent-dark)}
.footer-brand p{max-width:300px;margin-top:18px;font-size:14px;color:var(--text-muted)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;border-top:1px solid var(--border);margin-top:54px;padding-top:22px;padding-bottom:26px;color:var(--text-muted);font-size:13px}
.footer-bottom a{margin-left:16px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2,.prose h3{scroll-margin-top:88px;margin-top:2em}
.prose p,.prose li{line-height:1.85}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}

@media(max-width:1199px){
  .mainnav{display:none}
  .header-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-menu{display:block;position:absolute;top:100%;left:0;right:0;z-index:51;max-height:calc(100dvh - 64px);overflow-y:auto;overscroll-behavior:contain;padding:12px var(--gutter) 24px;background:var(--bg);color:var(--text);box-shadow:var(--shadow-lg)}
  .mobile-menu ul{list-style:none;margin:0;padding:0}
  .mobile-menu a{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:10px 14px;border-radius:var(--r-sm);font-size:15px}
  .mobile-menu a svg{width:18px;height:18px}
  .mobile-menu a:hover,.mobile-menu a[aria-current]{background:var(--accent-soft);color:var(--accent-dark)}
  .mobile-menu__languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
  .mobile-menu__caption{padding:6px 14px;color:var(--text-muted);font-size:13px}
}
@media(max-width:768px){
  h1{font-size:clamp(24px,6vw,30px)}
  .section{padding-top:64px;padding-bottom:64px}
  .grid--two,.footer-grid{grid-template-columns:1fr}
  .footer-grid{gap:28px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .tilt,[class*="tilt-"]{transform:none}
  .lang__full{display:none}
  .lang__short{display:inline}
  .topbar__row{gap:8px}
  .brand{font-size:15px}
  .brand__mark{width:28px;height:28px}
  .lang{padding-inline:10px}
  .card,.panel{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .btn,.mainnav__link{transition:none}
}