:root{
  --color-page:#F4F6F5;
  --color-panel:#FFFFFF;
  --color-panel-soft:#E8EDEB;
  --color-border:#D3DBD8;
  --color-accent:#0F9BB8;
  --color-accent-deep:#0A6E84;
  --color-text:#121D20;
  --color-text-muted:#5A6A6E;
  --color-success:#1E9A5B;
  --color-warning:#D48A22;
  --color-error:#CF4238;
  --color-dark:#0F1A1D;
  --color-dark-panel:#16252A;
  --color-dark-border:#223338;
  --color-dark-text:#EAF1F0;
  --color-white:#FFFFFF;
  --color-flag-blue:#2B3F7E;
  --color-transparent:transparent;
  --rgb-text:18,29,32;
  --rgb-accent:15,155,184;
  --rgb-white:255,255,255;
  --font-display:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --radius-xs:4px;
  --radius-sm:6px;
  --radius-md:8px;
  --radius-lg:18px;
  --radius-round:999px;
  --header-height:72px;
  --content-width:1344px;
  --reading-width:820px;
  --gutter:32px;
  --section-space:104px;
  --focus-size:2px;
  --shadow-panel:0 1px 2px rgba(var(--rgb-text),.05),0 10px 28px -8px rgba(var(--rgb-text),.10),0 32px 64px -32px rgba(var(--rgb-text),.16);
  --shadow-button:0 8px 18px -8px rgba(var(--rgb-accent),.55);
  --shadow-small:0 1px 2px rgba(var(--rgb-text),.05);
  --transition-fast:150ms ease;
  --transition-reveal:560ms cubic-bezier(.22,.7,.2,1);
  --toc-offset:136px;
}
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-height) + 16px);
}
html.nav-open{overflow:hidden}
body{
  min-width:320px;
  margin:0;
  overflow-x:clip;
  color:var(--color-text);
  background:var(--color-page);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body,button,input,select,textarea{font:inherit}
img,svg,video,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{color:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
p,h1,h2,h3,h4,ul,ol,figure,blockquote,pre{margin-top:0}
ul,ol{padding-left:1.25rem}
nav ul,.plain-list{list-style:none;margin:0;padding:0}
h1,h2,h3,h4{
  color:var(--color-text);
  font-family:var(--font-display);
  text-wrap:balance;
}
h1{
  margin-bottom:24px;
  font-size:clamp(52px,4.8vw,72px);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.02em;
}
h2{
  margin-bottom:20px;
  font-size:clamp(34px,3.4vw,52px);
  font-weight:850;
  line-height:1.16;
  letter-spacing:-.015em;
}
h3{
  margin-bottom:12px;
  font-size:clamp(22px,2vw,30px);
  font-weight:800;
  line-height:1.25;
}
h4{margin-bottom:10px;font-size:18px;font-weight:800}
p{margin-bottom:1.15em}
strong{font-weight:700}
small{font-size:.8125rem}
code,kbd,samp,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{
  max-width:100%;
  overflow-x:auto;
  padding:20px;
  border:1px solid var(--color-dark-border);
  border-radius:var(--radius-md);
  color:var(--color-dark-text);
  background:var(--color-dark-panel);
  -webkit-overflow-scrolling:touch;
}
pre code{overflow-wrap:normal}
table{border-collapse:collapse}
hr{border:0;border-top:1px solid var(--color-border)}
::selection{color:var(--color-white);background:var(--color-accent-deep)}
:where(a,button,input,select,textarea,summary,[role="tab"]):focus-visible{
  outline:var(--focus-size) solid var(--color-accent);
  outline-offset:3px;
}
.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:var(--section-space);
  padding-bottom:var(--section-space);
  overflow-x:clip;
}
.section-compact{padding-top:64px;padding-bottom:64px}
.section-dark{
  color:var(--color-dark-text);
  background:var(--color-dark);
  border-block:1px solid var(--color-dark-border);
}
.section-dark h1,.section-dark h2,.section-dark h3,.section-dark h4{color:var(--color-dark-text)}
.section-heading{max-width:780px;margin-bottom:42px}
.section-heading p{color:var(--color-text-muted);font-size:18px}
.no-break{white-space:nowrap}
.muted{color:var(--color-text-muted)}
.mono{font-family:var(--font-mono)}
.accent-text{color:var(--color-accent)}
.panel{
  min-width:0;
  padding:28px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-md);
  background:var(--color-panel);
  box-shadow:var(--shadow-panel);
}
.panel-soft{background:var(--color-panel-soft);box-shadow:none}
.grid{display:grid;gap:24px}
.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>*{min-width:0}
.stack>*+*{margin-top:20px}
.badge{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  max-width:100%;
  padding:3px 10px;
  overflow:hidden;
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);
  color:var(--color-text-muted);
  background:var(--color-panel);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.35;
  overflow-wrap:anywhere;
}
.badge-dot::before{
  width:6px;
  height:6px;
  margin-right:8px;
  flex-shrink:0;
  border-radius:50%;
  background:var(--color-accent);
  content:"";
}
.btn{
  display:inline-flex;
  min-width:24px;
  min-height:48px;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 24px;
  border:1px solid var(--color-transparent);
  border-radius:var(--radius-md);
  font-weight:750;
  line-height:1.2;
  text-align:center;
  transition:background var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast),transform var(--transition-fast);
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{color:var(--color-white);background:var(--color-accent);box-shadow:var(--shadow-button)}
.btn-primary:hover{background:var(--color-accent-deep)}
.btn-secondary{border-color:var(--color-border);background:var(--color-panel);box-shadow:var(--shadow-small)}
.btn-secondary:hover{border-color:var(--color-text-muted)}
.btn-dark{color:var(--color-dark-text);background:var(--color-dark-panel);border-color:var(--color-dark-border)}
.btn-small{min-height:38px;padding:7px 15px;font-size:14px}
.button-row{display:flex;flex-wrap:wrap;gap:12px}
.icon-box{
  display:inline-flex;
  width:40px;
  height:40px;
  flex-shrink:0;
  align-items:center;
  justify-content:center;
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);
  color:var(--color-accent-deep);
  background:var(--color-panel-soft);
}
.icon-box svg{width:20px;height:20px}
.reveal{transition:opacity var(--transition-reveal),transform var(--transition-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.site-head{
  position:relative;
  z-index:50;
  height:var(--header-height);
  border-bottom:1px solid var(--color-border);
  background:var(--color-page);
}
.head-row{
  position:relative;
  display:flex;
  height:var(--header-height);
  align-items:center;
  gap:36px;
}
.brand{
  display:inline-flex;
  min-height:44px;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-mark{width:30px;height:30px;flex-shrink:0}
.brand-name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:850;
  letter-spacing:.02em;
}
.brand-local{color:var(--color-text-muted);font-weight:650}
.desktop-nav{display:flex;flex:1;align-items:center;justify-content:center}
.desktop-nav ul{display:flex;align-items:center;flex-wrap:wrap}
.desktop-nav li{display:flex;align-items:center;color:var(--color-text-muted);font-size:14px}
.desktop-nav li+li::before{margin-inline:11px;color:var(--color-border);content:"·";font-weight:800}
.desktop-nav a{display:inline-flex;min-height:32px;align-items:center;padding:4px 2px}
.desktop-nav a:hover,.desktop-nav a[aria-current="page"]{color:var(--color-text)}
.desktop-nav a[aria-current="page"]{font-weight:700}
.header-tools{display:flex;align-items:center;gap:10px;flex-shrink:0}
.login-link{
  display:inline-flex;
  min-height:36px;
  align-items:center;
  justify-content:center;
  padding:6px 16px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);
  background:var(--color-panel);
  font-size:14px;
  font-weight:700;
  box-shadow:var(--shadow-small);
}
.language-box{position:relative}
.language-button{
  display:inline-flex;
  min-width:24px;
  min-height:36px;
  align-items:center;
  justify-content:center;
  gap:5px;
  padding:5px 8px;
  border:0;
  border-radius:var(--radius-sm);
  color:var(--color-text-muted);
  background:var(--color-transparent);
  font-size:13px;
}
.language-menu{
  position:absolute;
  top:calc(100% + 10px);
  right:0;
  width:154px;
  padding:6px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-md);
  background:var(--color-panel);
  box-shadow:var(--shadow-panel);
}
.language-menu[hidden]{display:none}
.language-menu a{
  display:flex;
  min-height:40px;
  align-items:center;
  padding:7px 10px;
  border-radius:var(--radius-sm);
  font-size:14px;
}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--color-panel-soft)}
.menu-button{
  display:none;
  width:44px;
  min-width:44px;
  height:44px;
  min-height:44px;
  padding:9px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-sm);
  background:var(--color-panel);
}
.menu-button span{
  display:block;
  width:20px;
  height:2px;
  margin:4px auto;
  background:var(--color-text);
  transition:transform var(--transition-fast),opacity var(--transition-fast);
}
.menu-button[aria-expanded="true"] span:first-child{transform:translateY(6px) rotate(45deg)}
.menu-button[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-button[aria-expanded="true"] span:last-child{transform:translateY(-6px) rotate(-45deg)}
.mobile-nav{
  position:absolute;
  z-index:55;
  top:var(--header-height);
  right:0;
  left:0;
  display:none;
  max-height:calc(100dvh - var(--header-height));
  overflow-y:auto;
  padding:10px var(--gutter) 18px;
  border-bottom:1px solid var(--color-border);
  background:var(--color-panel);
  overscroll-behavior:contain;
  box-shadow:var(--shadow-panel);
}
.mobile-nav.is-open{display:block}
.mobile-nav a{
  display:flex;
  width:100%;
  min-height:44px;
  align-items:center;
  padding:10px 8px;
  border-bottom:1px solid var(--color-border);
}
.mobile-nav a[aria-current="page"]{color:var(--color-accent-deep);font-weight:750}
.mobile-languages{padding-top:10px}
.nav-veil{
  position:fixed;
  z-index:40;
  inset:var(--header-height) 0 0;
  border:0;
  background:rgba(var(--rgb-text),.32);
}
.nav-veil[hidden]{display:none}
.site-footer{
  overflow-x:clip;
  color:var(--color-dark-text);
  background:var(--color-dark);
  border-top:1px solid var(--color-dark-border);
}
.footer-main{
  display:grid;
  grid-template-columns:minmax(240px,1.3fr) repeat(3,minmax(160px,1fr));
  gap:46px;
  padding-top:72px;
  padding-bottom:54px;
}
.footer-brand p{max-width:390px;color:var(--color-dark-text);opacity:.72}
.footer-logo-row{display:flex;align-items:center;gap:10px;margin-bottom:18px;font-weight:850}
.footer-logo-row img{width:34px;height:34px}
.footer-title{margin-bottom:14px;color:var(--color-dark-text);font-size:14px;font-weight:800}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li+li{margin-top:8px}
.footer-links a{
  display:inline-flex;
  min-height:28px;
  align-items:center;
  color:var(--color-dark-text);
  opacity:.72;
  font-size:14px;
}
.footer-links a:hover{opacity:1;color:var(--color-white)}
.footer-bottom{
  display:flex;
  min-height:68px;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  border-top:1px solid var(--color-dark-border);
  color:var(--color-dark-text);
  opacity:.72;
  font-size:13px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.prose{max-width:var(--reading-width)}
.prose h2{margin-top:2em}
.prose h3{margin-top:1.7em}
.prose li+li{margin-top:.45em}
.prose a:not(.btn){color:var(--color-accent-deep);text-decoration:underline;text-underline-offset:3px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
@media (max-width:1120px){
  .head-row{gap:22px}
  .desktop-nav li+li::before{margin-inline:7px}
  .desktop-nav li{font-size:13px}
}
@media (max-width:960px){
  .desktop-nav,.language-box{display:none}
  .header-tools{margin-left:auto}
  .menu-button{display:block}
  .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:768px){
  :root{--gutter:20px;--section-space:76px}
  h1{font-size:clamp(28px,10vw,40px);line-height:1.12}
  h2{font-size:clamp(28px,8vw,38px)}
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section-heading{margin-bottom:32px}
}
@media (max-width:640px){
  :root{--gutter:16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .panel{padding:22px}
  .btn{width:100%}
  .button-row{width:100%}
  .tilt,[class*="tilt-"]{transform:none}
  .footer-main{grid-template-columns:1fr;gap:30px;padding-top:54px}
  .footer-bottom{align-items:flex-start;flex-direction:column;padding-block:20px}
  .brand-name{font-size:17px}
  .login-link{padding-inline:12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}