:root{
  --bg:#ECEAF6;
  --bg-top:#F4F3FA;
  --bg-bottom:#E4E1F1;
  --panel:#F8F7FC;
  --panel-2:#F0EEF8;
  --card:#FFFFFF;
  --groove:#DDDAEC;
  --canvas-top:#DDDAEC;
  --canvas-bottom:#E6E3F1;
  --cell-tint:rgba(248,247,252,.5);
  --border:#CFCBE0;
  --accent:#00796B;
  --accent-dark:#00564C;
  --accent-2:#23B8A0;
  --accent-soft:#9ED9CE;
  --accent-pale:#C9EDE6;
  --accent-wash:rgba(0,121,107,.06);
  --accent-wash-end:rgba(35,184,160,.10);
  --ink:#12161F;
  --ink-hover:#262B36;
  --muted:#555B6E;
  --on-ink:#FFFFFF;
  --term:#3A3F4A;
  --term-ink:#E3F3EF;
  --success:#1E9E5A;
  --warn:#C98A12;
  --error:#D13B3B;
  --ann-start:#0B2B30;
  --ann-mid:#0F4B49;
  --grid-faint:rgba(18,22,31,.04);
  --mask-solid:#000000;
  --hi-edge:rgba(255,255,255,.92);
  --halo:rgba(35,184,160,.24);
  --veil:rgba(18,22,31,.32);
  --shadow-panel:0 32px 80px -16px rgba(0,121,107,.12),0 8px 22px -8px rgba(0,121,107,.10);
  --shadow-float:0 16px 36px -10px rgba(0,121,107,.18),0 2px 6px rgba(18,22,31,.06);
  --shadow-block:0 18px 40px -14px rgba(0,121,107,.30);
  --shadow-groove:inset 0 2px 4px -2px rgba(18,22,31,.08);
  --flag-red:#C8333D;
  --flag-blue:#22356F;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(18,22,31,.16);
  --r-0:0;
  --r-xs:3px;
  --r-sm:4px;
  --r-md:6px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --font-body-size:18px;
  --font-small:15px;
  --font-micro:12px;
  --weight-regular:400;
  --weight-medium:500;
  --display-size:68px;
  --heading-size:40px;
  --subheading-size:28px;
  --gutter:max(24px,calc((100vw - 1280px) / 2));
  --content-width:1328px;
  --reading-width:800px;
  --section-gap:96px;
  --header-height:104px;
  --anchor-offset:120px;
  --toc-offset:184px;
  --ease:cubic-bezier(.2,.65,.3,1);
  --reveal-duration:.36s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--font-body-size);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
ul{margin:0;padding:0;list-style:none}
p{margin:0 0 24px}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-regular);text-wrap:balance;overflow-wrap:break-word}
h1{margin:0 0 28px;font-size:clamp(52px,4.7vw,68px);line-height:1.12;letter-spacing:-.02em}
h2{margin:0 0 28px;font-size:var(--heading-size);line-height:1.2;letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:var(--subheading-size);line-height:1.3}
h4{font-size:20px;line-height:1.4}
strong,b{font-weight:var(--weight-medium)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:24px}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:24px}
.section{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
.section-head{max-width:760px;margin-bottom:40px}
.muted{color:var(--muted)}
.mono,.kicker{font-family:var(--font-mono)}
.kicker{display:block;margin-bottom:16px;font-size:var(--font-micro);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.grid-two,.grid-three,.grid-five{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
:where(.grid-two,.grid-three,.grid-five,.wrap,.reading-wrap)>*{min-width:0}
.panel{padding:32px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:inset 0 1px 0 var(--hi-edge),var(--shadow-panel)}
.groove{padding:16px;background:var(--groove);border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:var(--shadow-groove)}
.text-link{display:inline-flex;align-items:center;min-height:24px;text-decoration:underline;text-underline-offset:4px}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:64px}
.prose h3{margin-top:40px}
.prose ul{padding-left:24px;list-style:disc;margin-bottom:24px}
.prose ol{padding-left:28px;margin-bottom:24px}
.prose a{text-decoration:underline;text-underline-offset:4px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
:not(pre)>code{padding:2px 5px;background:var(--groove);border-radius:var(--r-xs)}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--term);color:var(--term-ink);border-radius:var(--r-sm);line-height:1.7}
pre code{white-space:pre;overflow-wrap:normal}
blockquote{margin:24px 0}
.decorated-region{position:relative;overflow-x:clip}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-block:32px}
#server-status+*{margin-top:32px}
.reveal{transition:opacity var(--reveal-duration) var(--ease),transform var(--reveal-duration) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.cta-row{display:flex;flex-wrap:wrap;gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;height:56px;padding:0 30px;border-radius:var(--r-0);font-family:var(--font-body);font-size:17px;line-height:1;white-space:nowrap;flex-shrink:0;text-decoration:none}
.btn-solid,.btn-primary{background:var(--ink);color:var(--on-ink);border:1px solid var(--ink)}
.btn-solid:hover,.btn-primary:hover,.btn.is-hover{background:var(--ink-hover)}
.btn-solid:active,.btn-primary:active{transform:translateY(1px)}
.btn-chev{font-size:22px;line-height:1;transform:translateY(-1px)}
.btn-line,.btn-secondary{background:var(--card);color:var(--ink);border:1px solid var(--ink)}
.btn-line:hover,.btn-secondary:hover{background:var(--panel)}
.btn-small{height:44px;padding-inline:20px;font-size:var(--font-small)}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.notice{min-height:40px;display:flex;align-items:center;justify-content:center;gap:16px;padding:6px var(--gutter);background:linear-gradient(90deg,var(--ann-start) 0%,var(--ann-mid) 46%,var(--accent-2) 100%);color:var(--on-ink);font-size:14px;line-height:1.4}
.notice-text{letter-spacing:.01em}
.notice-btn{display:inline-flex;align-items:center;justify-content:center;height:28px;padding:0 12px;background:var(--ink);color:var(--on-ink);border-radius:var(--r-xs);font-size:13px;white-space:nowrap}
.notice-btn:hover{background:var(--ink-hover)}
#site-header{position:sticky;top:0;z-index:70}
.topbar{position:relative;z-index:73;height:64px;display:flex;align-items:stretch;flex-wrap:nowrap;padding-left:var(--gutter);background:var(--bg-top);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:10px;margin-right:48px;font-family:var(--font-display);font-size:20px;font-weight:var(--weight-medium);letter-spacing:-.02em;flex-shrink:0;white-space:nowrap}
.brand img{width:30px;height:32px;object-fit:contain}
.brand-zh{font-size:var(--font-small);font-weight:var(--weight-regular);color:var(--muted)}
.desktop-nav{flex:1;min-width:0}
.tabs{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:28px;height:100%}
.tabs li{height:100%;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:100%;min-height:44px;font-size:15px;color:var(--muted);white-space:nowrap}
.tabs a:hover,.tabs a[aria-current="page"]{color:var(--ink)}
.tabs a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--ink)}
.topbar-end{margin-left:auto;display:flex;align-items:stretch;flex-shrink:0}
.language-picker{position:relative;display:flex}
.lang{display:flex;align-items:center;justify-content:center;gap:8px;min-width:44px;width:auto;padding:0 24px;border:0;background:transparent;color:var(--muted);font:inherit;font-size:14px;cursor:pointer}
.lang-text{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--ink)}
.lang-panel{position:absolute;right:8px;top:calc(100% + 8px);z-index:80;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--groove)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 36px;background:var(--ink);color:var(--on-ink);font-size:15px;white-space:nowrap}
.login:hover{background:var(--ink-hover)}
.menu-btn{display:none;align-items:center;justify-content:center;gap:8px;min-width:44px;min-height:44px;padding:0 16px;border:0;background:transparent;color:var(--ink);font:inherit;font-size:14px;cursor:pointer}
.menu-icon{display:flex;flex-direction:column;gap:4px}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-btn[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) rotate(45deg)}
.menu-btn[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] .menu-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;bottom:0;z-index:72;width:min(100%,420px);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px 24px 32px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain;border-left:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 8px;font-size:16px;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current="page"],.mobile-drawer a[aria-current="true"]{color:var(--accent-dark);background:var(--accent-wash)}
.drawer-label{display:block;padding:24px 8px 8px;color:var(--muted);font-family:var(--font-mono);font-size:var(--font-micro)}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:71;background:var(--veil);border:0;width:100%}
html.nav-open{overflow:hidden}
.site-footer{background:var(--panel);border-top:1px solid var(--border);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand{margin:0 0 20px}
.footer-copy{max-width:26em;color:var(--muted);font-size:var(--font-small)}
.footer-title{margin:0 0 20px;font-family:var(--font-mono);font-weight:var(--weight-medium);font-size:var(--font-small)}
.footer-links{display:grid;gap:8px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--font-small)}
.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:48px;padding-top:24px;border-top:1px solid var(--border);font-size:14px;color:var(--muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:16px}
.legal-links a{display:inline-flex;align-items:center;min-height:28px}
@media(max-width:1320px){
  .tabs{gap:20px}
  .brand{margin-right:32px}
}
@media(max-width:1240px){
  .tabs{gap:16px}
  .tabs a{font-size:14px}
  .lang{padding:0 16px}
  .lang-text{display:none}
  .login{padding:0 24px}
}
@media(max-width:1120px){
  .desktop-nav{display:none}
  .menu-btn{display:flex}
  .topbar-end{margin-left:auto}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:1121px){
  .mobile-drawer,.menu-veil{display:none}
}
@media(max-width:768px){
  :root{--gutter:20px;--section-gap:64px;--heading-size:32px;--subheading-size:24px}
  h1{font-size:40px}
  .wrap,.reading-wrap{padding-inline:var(--gutter)}
  .notice{font-size:12px;gap:10px;flex-wrap:wrap}
  .topbar{padding-left:20px}
  .brand{margin-right:16px}
  .login{padding:0 20px}
  .btn{height:52px;padding:0 24px;font-size:16px}
  .btn-small{height:44px;padding-inline:16px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .panel{padding:24px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.tilt-decoration{transform:none}
  .decorated-region>*{max-width:100%}
  .grid-two,.footer-grid{grid-template-columns:1fr}
  .topbar{padding-left:16px}
  .brand{font-size:18px;gap:7px;margin-right:8px}
  .brand img{width:25px;height:28px}
  .menu-btn{padding-inline:12px}
  .menu-text{display:none}
  .login{padding-inline:16px;font-size:14px}
  .lang{padding-inline:10px}
  .footer-grid{gap:32px}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:16px}
  .brand img{width:23px}
  .login{padding-inline:12px}
  h1{font-size:36px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}