:root{
  --color-bg:#0E0E0F;
  --color-panel:#161617;
  --color-panel-raised:#1D1D1F;
  --color-border:#2A2A2C;
  --color-edge:rgba(255,255,255,.08);
  --color-accent:#37F06E;
  --color-accent-dark:#1FBF4F;
  --color-accent-glow:rgba(55,240,110,.22);
  --color-accent-soft:rgba(55,240,110,.10);
  --color-text:#F2F2F3;
  --color-muted:#9A9AA0;
  --color-dim:#6E6E74;
  --color-dot:#3A3A3D;
  --color-dot-mid:#48484B;
  --color-dot-high:#565659;
  --color-success:#37F06E;
  --color-warn:#E8C25A;
  --color-error:#F26D5B;
  --color-flag-red:#C93A38;
  --color-flag-blue:#2F4A9C;
  --color-flag-navy:#28356B;
  --color-flag-white:#F4F4F5;
  --color-focus:#37F06E;
  --font-display:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SF Mono','Cascadia Code',Consolas,'Courier New',monospace;
  --radius-xs:4px;
  --radius-s:6px;
  --radius-m:10px;
  --radius-l:14px;
  --radius-pill:999px;
  --header-height:64px;
  --gutter:clamp(16px,3vw,40px);
  --content-width:1280px;
  --reading-width:780px;
  --shadow-accent:0 0 22px var(--color-accent-glow),0 0 2px var(--color-accent-glow);
  --shadow-panel:0 22px 70px rgba(0,0,0,.28);
  --transition-fast:160ms ease;
  --transition-normal:320ms ease;
  --toc-offset:82px;
}
*,*::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)}
html.nav-open{overflow:hidden}
body{margin:0;min-width:320px;background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);font-size:16px;line-height:1.7;overflow-x:clip}
body,button,input,select,textarea{font-family:var(--font-body)}
img,svg,video{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit}
button{color:inherit}
a{color:inherit;text-decoration:none}
p,h1,h2,h3,h4,ul,ol,dl,dd,figure,blockquote,pre{margin-top:0}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--color-text);text-wrap:balance}
h1{font-size:clamp(52px,5.2vw,72px);line-height:1.1;letter-spacing:-.015em;font-weight:900}
h2{font-size:clamp(32px,3.4vw,48px);line-height:1.16;letter-spacing:-.012em;font-weight:850}
h3{font-size:clamp(21px,2vw,28px);line-height:1.25;font-weight:750}
p{color:var(--color-muted)}
strong{color:var(--color-text)}
small{font-size:.8125rem}
code,kbd,samp{font-family:var(--font-mono)}
:not(pre)>code{overflow-wrap:anywhere;color:var(--color-accent);background:var(--color-panel-raised);border:1px solid var(--color-border);border-radius:var(--radius-xs);padding:.08em .35em}
pre{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;background:var(--color-panel);border:1px solid var(--color-border);border-radius:var(--radius-m);padding:18px}
pre code{white-space:pre}
table{border-collapse:collapse}
ul,ol{padding-left:1.3em}
hr{border:0;border-top:1px solid var(--color-border)}
::selection{color:var(--color-bg);background:var(--color-accent)}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono)}
.text-muted{color:var(--color-muted)}
.text-accent{color:var(--color-accent)}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading-width) + var(--gutter) * 2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:96px;padding-bottom:96px}
.section-tight{padding-top:56px;padding-bottom:56px}
.section-head{max-width:760px;margin-bottom:40px}
.section-kicker{margin-bottom:12px;color:var(--color-accent);font-family:var(--font-mono);font-size:.78rem;letter-spacing:.04em}
.section-title{margin-bottom:16px}
.section-copy{font-size:1.05rem;max-width:680px}
.skip-link{position:fixed;z-index:1000;top:8px;left:8px;padding:9px 14px;background:var(--color-accent);color:var(--color-bg);border-radius:var(--radius-s);transform:translateY(-150%)}
.skip-link:focus{transform:none}
:where(a,button,input,select,textarea,summary,[role="tab"]):focus-visible{outline:2px solid var(--color-focus);outline-offset:3px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;min-width:44px;padding:11px 24px;border:1px solid transparent;border-radius:var(--radius-s);font-size:.94rem;font-weight:700;line-height:1.2;cursor:pointer;transition:color var(--transition-fast),background var(--transition-fast),border-color var(--transition-fast),transform var(--transition-fast)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--color-accent);border-color:var(--color-accent);color:var(--color-bg);box-shadow:var(--shadow-accent)}
.btn-primary:hover{background:var(--color-accent-dark);border-color:var(--color-accent-dark)}
.btn-secondary{background:transparent;border-color:var(--color-border);color:var(--color-text)}
.btn-secondary:hover{border-color:var(--color-muted)}
.btn-panel{background:var(--color-panel);border-color:var(--color-border);color:var(--color-text)}
.btn-panel:hover{border-color:var(--color-accent-dark);color:var(--color-accent)}
.btn[aria-disabled="true"],.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-symbol{font-family:var(--font-mono)}
.badge,.tag,.fact-chip{display:inline-flex;align-items:center;gap:7px;max-width:100%;min-height:28px;padding:4px 10px;border:1px solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-panel);color:var(--color-muted);font-family:var(--font-mono);font-size:.74rem;line-height:1.4;overflow:hidden}
.badge-dot{width:7px;height:7px;flex:0 0 auto;border-radius:50%;background:var(--color-accent);box-shadow:0 0 9px var(--color-accent-glow)}
.badge-success{color:var(--color-success)}
.badge-warn{color:var(--color-warn)}
.badge-error{color:var(--color-error)}
.card,.panel{min-width:0;background:var(--color-panel);border:1px solid var(--color-border);border-radius:var(--radius-m)}
.card{padding:24px}
.panel-raised{background:var(--color-panel-raised);box-shadow:var(--shadow-panel)}
.card-title{margin-bottom:8px;font-size:1.15rem}
.card-copy{margin-bottom:0;font-size:.94rem}
.icon-box{display:inline-grid;place-items:center;width:38px;height:38px;flex:0 0 auto;border:1px solid var(--color-border);border-radius:var(--radius-s);background:var(--color-panel-raised);color:var(--color-accent)}
.icon-box svg{width:20px;height:20px}
.reveal{transition:opacity .65s ease,transform .65s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.site-head{position:relative;z-index:100;height:var(--header-height);display:flex;align-items:center;padding-inline:var(--gutter);gap:28px;border-bottom:1px solid var(--color-border);background:var(--color-bg)}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;min-height:44px}
.brand-logo{width:28px;height:28px;flex:0 0 auto}
.brand-copy{display:flex;align-items:baseline;gap:7px;white-space:nowrap}
.brand-name{font-family:var(--font-display);font-weight:850;font-size:17px;letter-spacing:.01em}
.brand-local{color:var(--color-muted);font-size:12px;font-weight:500}
.main-nav{display:flex;align-items:center;gap:3px;min-width:0;flex:1}
.main-nav a{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:6px 9px;border-radius:var(--radius-s);color:var(--color-muted);font-size:12.5px;white-space:nowrap;transition:color var(--transition-fast),background var(--transition-fast)}
.main-nav a svg{width:14px;height:14px;flex:0 0 auto}
.main-nav a:hover{color:var(--color-text);background:var(--color-panel)}
.main-nav a.is-active{color:var(--color-text)}
.main-nav a.is-active svg{color:var(--color-accent)}
.head-tools{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.lang-menu{position:relative}
.lang-toggle{display:inline-flex;align-items:center;gap:5px;min-height:36px;min-width:44px;padding:6px 8px;border:0;background:transparent;color:var(--color-muted);cursor:pointer}
.lang-toggle:hover{color:var(--color-text)}
.lang-popover{position:absolute;top:calc(100% + 9px);right:0;z-index:130;width:150px;padding:6px;border:1px solid var(--color-border);border-radius:var(--radius-s);background:var(--color-panel-raised);box-shadow:var(--shadow-panel)}
.lang-popover[hidden]{display:none}
.lang-popover a{display:flex;align-items:center;min-height:40px;padding:7px 10px;border-radius:var(--radius-xs);color:var(--color-muted);font-size:.82rem}
.lang-popover a:hover,.lang-popover a[aria-current="true"]{background:var(--color-panel);color:var(--color-text)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:6px 17px;border:1px solid var(--color-border);border-radius:var(--radius-s);background:var(--color-panel);font-size:13px}
.btn-login:hover{border-color:var(--color-accent-dark);color:var(--color-accent)}
.menu-toggle{display:none;place-items:center;min-width:44px;min-height:44px;padding:0;border:1px solid var(--color-border);border-radius:var(--radius-s);background:var(--color-panel);cursor:pointer}
.menu-toggle svg{width:20px;height:20px}
.mobile-nav{display:none}
.mobile-nav a{width:100%;min-height:46px;align-items:center;gap:10px;padding:10px 16px;border-bottom:1px solid var(--color-border);color:var(--color-muted)}
.mobile-nav a svg{width:17px;height:17px;flex:0 0 auto}
.mobile-nav a.is-active{color:var(--color-text)}
.mobile-nav a.is-active svg{color:var(--color-accent)}
.mobile-lang-title{padding:15px 16px 5px;color:var(--color-dim);font-family:var(--font-mono);font-size:.7rem}
.mobile-nav .mobile-lang-link{border-bottom:0}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;z-index:80;background:rgba(0,0,0,.54)}
.site-footer{border-top:1px solid var(--color-border);background:var(--color-bg)}
.footer-main{display:grid;grid-template-columns:1.35fr 1fr 1.2fr .8fr;gap:44px;padding-top:64px;padding-bottom:52px}
.footer-brand-copy{max-width:340px;margin-top:16px;font-size:.9rem}
.footer-title{margin-bottom:15px;color:var(--color-text);font-family:var(--font-mono);font-size:.75rem;font-weight:600;letter-spacing:.04em}
.footer-links{display:grid;gap:7px}
.footer-links a{width:fit-content;min-height:28px;color:var(--color-muted);font-size:.85rem}
.footer-links a:hover{color:var(--color-accent)}
.footer-hot{display:flex;flex-wrap:wrap;gap:7px}
.footer-hot a{display:inline-flex;align-items:center;min-height:30px;padding:4px 9px;border:1px solid var(--color-border);border-radius:var(--radius-pill);color:var(--color-muted);font-size:.76rem}
.footer-hot a:hover{border-color:var(--color-accent-dark);color:var(--color-accent)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:20px;padding-bottom:26px;border-top:1px solid var(--color-border);color:var(--color-dim);font-size:.78rem}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{min-height:24px}
.footer-legal a:hover{color:var(--color-text)}
.prose{min-width:0;color:var(--color-muted)}
.prose h2,.prose h3{scroll-margin-top:var(--toc-offset);margin-top:2.1em;margin-bottom:.7em}
.prose p,.prose li{overflow-wrap:break-word}
.prose a{color:var(--color-accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose a.btn.btn-primary{color:var(--color-bg);text-decoration:none}
.prose blockquote{margin-inline:0}
.prose img{border-radius:var(--radius-s)}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
.decor-stage{position:relative;overflow-x:clip}
.decor-layer{pointer-events:none}
[data-parallax-decor]{will-change:transform}
.tilt-card{transform-style:preserve-3d;will-change:transform}
@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!important;transform:none!important}
}
@media (max-width:1120px){
  .main-nav{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:grid}
  .site-head.is-open{z-index:120}
  .site-head.is-open .mobile-nav{display:block;position:fixed;top:var(--header-height);left:0;right:0;z-index:120;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--color-border);background:var(--color-panel)}
  .site-head.is-open .mobile-nav a{display:flex}
  .site-head.is-open~.nav-veil{display:block}
  .footer-main{grid-template-columns:1.2fr 1fr 1fr}
  .footer-language{grid-column:2}
}
@media (max-width:768px){
  h1{font-size:clamp(32px,10vw,40px);line-height:1.12;letter-spacing:-.01em}
  h2{font-size:clamp(27px,8vw,36px)}
  .section{padding-top:72px;padding-bottom:72px}
  .section-tight{padding-top:44px;padding-bottom:44px}
  .brand-local,.desktop-language{display:none}
  .footer-main{grid-template-columns:1fr 1fr;gap:34px 24px}
  .footer-brand{grid-column:1/-1}
  .footer-language{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  [data-parallax-decor]{transform:none!important}
}
@media (max-width:520px){
  .site-head{gap:8px}
  .brand-name{font-size:15px}
  .head-tools{gap:6px}
  .btn-login{padding-inline:12px}
  .desktop-language{display:none}
  .footer-main{grid-template-columns:1fr}
  .footer-brand,.footer-language{grid-column:auto}
}
@media (max-width:640px){
  .no-break{white-space:normal}
  .wrap,.reading-wrap{padding-inline:max(16px,var(--gutter))}
  .decor-stage{overflow-x:clip}
  .tilt-card,[class*="tilted"],[class*="rotate-card"]{transform:none!important}
  .card{padding:20px}
}