:root{
  --color-bg:#141414;
  --color-panel:#1C1C1C;
  --color-panel-raised:#242424;
  --color-border:#2E2E2D;
  --color-border-strong:#57544B;
  --color-accent:#E8E3D4;
  --color-accent-dark:#C7C0AA;
  --color-text:#F4F3EF;
  --color-text-soft:#C9C6BE;
  --color-text-muted:#9C9A93;
  --color-success:#7FBF93;
  --color-warn:#D9A75F;
  --color-error:#D96B5B;
  --color-ink:#201F1B;
  --color-ink-soft:#57544B;
  --color-card-line:rgba(32,31,27,.12);
  --color-card-edge:rgba(199,192,170,.5);
  --color-glow:rgba(232,227,212,.09);
  --color-glow-soft:rgba(232,227,212,.045);
  --color-shadow:rgba(0,0,0,.42);
  --color-shadow-deep:rgba(0,0,0,.55);
  --color-focus:rgba(232,227,212,.32);
  --color-flag-red:#C7423F;
  --color-flag-blue:#2F4272;
  --color-flag-navy:#26355C;
  --color-flag-white:#F2F1EC;
  --color-flag-line:#3B3A37;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --radius-small:8px;
  --radius-medium:12px;
  --radius-pill:999px;
  --gutter:clamp(16px,4vw,36px);
  --content-width:1180px;
  --wide-width:1400px;
  --header-height:72px;
  --toc-offset:84px;
  --shadow-card:0 6px 18px var(--color-shadow),0 28px 70px var(--color-shadow-deep);
  --shadow-soft:0 10px 30px var(--color-shadow);
  --transition-fast:150ms ease;
}
*,
*::before,
*::after{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-height) + 16px);
  background:var(--color-bg);
}
html.nav-open{overflow:hidden}
body{
  margin:0;
  min-width:320px;
  overflow-x:clip;
  background:var(--color-bg);
  color:var(--color-text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
body,
button,
input,
select,
textarea{font-family:var(--font-body)}
img,
svg{display:block;max-width:100%}
img{height:auto}
button,
input,
select,
textarea{font:inherit}
button,
summary{cursor:pointer}
a{color:inherit;text-decoration:none}
p,
h1,
h2,
h3,
h4,
ul,
ol,
blockquote,
pre,
figure{margin-top:0}
h1,
h2,
h3,
h4{
  color:var(--color-text);
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.18;
  text-wrap:balance;
}
h1{font-size:clamp(52px,5vw,68px);letter-spacing:-.01em}
h2{font-size:clamp(32px,4vw,48px);letter-spacing:-.01em}
h3{font-size:clamp(21px,2vw,28px)}
p,
li{color:var(--color-text-muted)}
strong{color:var(--color-text-soft);font-weight:500}
small{color:var(--color-text-muted)}
code,
pre{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-small);
  padding:.12em .38em;
}
pre{
  max-width:100%;
  overflow-x:auto;
  padding:20px;
  color:var(--color-text-soft);
  background:var(--color-panel);
  border:1px solid var(--color-border);
  border-radius:var(--radius-medium);
}
pre code{white-space:pre}
table{border-collapse:collapse}
th,
td{text-align:left}
::selection{color:var(--color-ink);background:var(--color-accent)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{
  outline:2px solid var(--color-accent);
  outline-offset:3px;
}
.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);
}
.section{
  position:relative;
  padding-top:96px;
  padding-bottom:96px;
  overflow-x:clip;
}
.section-head{max-width:760px;margin-bottom:40px}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--color-text-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.eyebrow::before{
  width:6px;
  height:6px;
  flex-shrink:0;
  border-radius:50%;
  background:var(--color-success);
  content:"";
}
.btn{
  min-height:44px;
  min-width:44px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  padding:11px 26px;
  font-size:15px;
  font-weight:600;
  line-height:1.25;
  text-align:center;
  transition:transform var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast);
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{
  color:var(--color-ink);
  background:var(--color-accent);
  border-color:var(--color-card-edge);
  box-shadow:0 8px 28px var(--color-glow);
}
.btn-primary:hover{background:var(--color-accent-dark)}
.btn-secondary{
  color:var(--color-text);
  background:transparent;
  border-color:var(--color-border);
}
.btn-secondary:hover{
  background:var(--color-panel);
  border-color:var(--color-border-strong);
}
.btn-quiet{
  color:var(--color-text-muted);
  background:transparent;
  border-color:transparent;
}
.btn-quiet:hover{color:var(--color-text);background:var(--color-panel)}
.panel,
.card{
  min-width:0;
  background:var(--color-panel);
  border:1px solid var(--color-border);
  border-radius:var(--radius-medium);
}
.panel{padding:clamp(20px,3vw,32px)}
.card{padding:24px}
.badge,
.chip{
  max-width:100%;
  display:inline-flex;
  align-items:center;
  gap:7px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-pill);
  padding:5px 12px;
  color:var(--color-text-soft);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.3;
  overflow:hidden;
}
.badge-dot{
  width:6px;
  height:6px;
  flex-shrink:0;
  border-radius:50%;
  background:var(--color-success);
}
.reveal{transition:opacity .6s ease,transform .6s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.site-nav{
  position:relative;
  z-index:100;
  min-height:var(--header-height);
  background:var(--color-bg);
}
.nav-shell{
  min-height:var(--header-height);
  max-width:var(--wide-width);
  margin-inline:auto;
  padding-inline:var(--gutter);
  display:flex;
  align-items:center;
  gap:18px;
}
.brand{
  display:flex;
  align-items:center;
  flex-shrink:0;
  gap:10px;
  min-height:44px;
}
.brand img{width:27px;height:27px}
.brand-word{color:var(--color-text);font-size:17px;font-weight:600;letter-spacing:.02em}
.brand-local{color:var(--color-text-muted);font-size:14px;font-weight:400}
.nav-primary{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:2px;
  margin-left:auto;
}
.nav-primary a{
  min-height:36px;
  display:inline-flex;
  align-items:center;
  padding:7px 12px;
  border-radius:var(--radius-pill);
  color:var(--color-text-muted);
  font-size:14px;
  white-space:nowrap;
  transition:color var(--transition-fast),background-color var(--transition-fast);
}
.nav-primary a:hover{color:var(--color-text)}
.nav-primary a.is-current{
  color:var(--color-text);
  background:var(--color-panel-raised);
}
.nav-tools{
  display:flex;
  align-items:center;
  flex-shrink:0;
  gap:8px;
}
.language-menu{position:relative}
.language-trigger{
  min-width:44px;
  min-height:44px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  border:0;
  color:var(--color-text-muted);
  background:transparent;
  font-size:13px;
}
.language-list{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  z-index:120;
  min-width:160px;
  padding:7px;
  display:none;
  background:var(--color-panel-raised);
  border:1px solid var(--color-border);
  border-radius:var(--radius-medium);
  box-shadow:var(--shadow-soft);
}
.language-menu.is-open .language-list{display:grid}
.language-list a{
  min-height:40px;
  display:flex;
  align-items:center;
  padding:7px 10px;
  border-radius:var(--radius-small);
  color:var(--color-text-muted);
  font-size:13px;
}
.language-list a:hover,
.language-list a[aria-current="true"]{color:var(--color-text);background:var(--color-panel)}
.nav-login{
  min-height:38px;
  display:inline-flex;
  align-items:center;
  padding:7px 17px;
  color:var(--color-text);
  border:1px solid var(--color-border);
  border-radius:var(--radius-pill);
  font-size:14px;
}
.nav-login:hover{background:var(--color-panel)}
.nav-toggle{
  width:44px;
  height:44px;
  display:none;
  place-items:center;
  border:0;
  border-radius:var(--radius-small);
  color:var(--color-text);
  background:transparent;
}
.nav-toggle-lines,
.nav-toggle-lines::before,
.nav-toggle-lines::after{
  width:19px;
  height:1px;
  display:block;
  background:var(--color-text);
  content:"";
}
.nav-toggle-lines{position:relative}
.nav-toggle-lines::before{position:absolute;top:-6px}
.nav-toggle-lines::after{position:absolute;top:6px}
.nav-drawer{
  position:absolute;
  top:var(--header-height);
  left:0;
  right:0;
  z-index:111;
  max-height:calc(100dvh - var(--header-height));
  display:none;
  overflow-y:auto;
  overscroll-behavior:contain;
  padding:10px var(--gutter) 20px;
  background:var(--color-panel);
  border-top:1px solid var(--color-border);
  box-shadow:var(--shadow-soft);
}
.nav-drawer.is-open{display:block}
.nav-drawer a{
  width:100%;
  min-height:46px;
  display:flex;
  align-items:center;
  padding:10px 12px;
  border-radius:var(--radius-small);
  color:var(--color-text-muted);
}
.nav-drawer a:hover,
.nav-drawer a.is-current{color:var(--color-text);background:var(--color-panel-raised)}
.nav-drawer-languages{
  display:grid;
  margin-top:8px;
  padding-top:8px;
  border-top:1px solid var(--color-border);
}
.nav-veil{
  position:fixed;
  inset:var(--header-height) 0 0;
  z-index:90;
  display:none;
  background:var(--color-shadow);
}
.nav-veil.is-open{display:block}
.site-footer{
  margin-top:80px;
  border-top:1px solid var(--color-border);
  background:var(--color-bg);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(220px,1.25fr) repeat(3,minmax(150px,1fr));
  gap:48px;
  padding-top:64px;
  padding-bottom:48px;
}
.footer-brand p{max-width:390px;margin-top:18px}
.footer-title{
  margin-bottom:14px;
  color:var(--color-text-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
}
.footer-links{display:grid;gap:8px}
.footer-links a{
  width:fit-content;
  min-height:28px;
  display:inline-flex;
  align-items:center;
  color:var(--color-text-muted);
  font-size:14px;
}
.footer-links a:hover{color:var(--color-text)}
.footer-bottom{
  padding-top:20px;
  padding-bottom:28px;
  display:flex;
  justify-content:space-between;
  gap:20px;
  border-top:1px solid var(--color-border);
  color:var(--color-text-muted);
  font-size:13px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.prose{max-width:780px}
.prose h2{margin-top:64px}
.prose h3{margin-top:38px}
.prose p,
.prose li{color:var(--color-text-soft)}
.prose a{text-decoration:underline;text-decoration-color:var(--color-border-strong);text-underline-offset:3px}
.prose img{border-radius:var(--radius-medium)}
.prose ol,
.prose ul{padding-left:1.35em}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
@media (max-width:1120px){
  .nav-primary{display:none}
  .nav-tools{margin-left:auto}
  .nav-toggle{display:grid}
}
@media (max-width:768px){
  h1{font-size:clamp(32px,9vw,40px);line-height:1.14;letter-spacing:-.01em}
  h2{font-size:clamp(28px,7vw,36px)}
  .section{padding-top:72px;padding-bottom:72px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px 24px}
}
@media (max-width:640px){
  .tilt,
  [class*="tilt"]{transform:none}
  .nav-shell{gap:8px}
  .language-menu>.language-trigger{display:none}
  .nav-login{padding-inline:13px}
  .brand-local{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
  .card,
  .panel{padding:20px}
}
@media (max-width:380px){
  .brand-word{font-size:15px}
  .nav-login{font-size:13px;padding-inline:11px}
}
@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}
}