:root {
  --bg:#F9F9FA;
  --panel:#FFFFFF;
  --panel-2:#F0EFF2;
  --border:#E4E2E8;
  --accent:#C04A82;
  --accent-dark:#8E2F5E;
  --accent-2:#E9A37E;
  --text:#17161B;
  --text-hover:#2C2A33;
  --muted:#5E5B66;
  --muted-2:#8B8893;
  --on-dark:#FFFFFF;
  --success:#3F9A4E;
  --success-glow:rgba(63,154,78,.26);
  --warn:#C98A12;
  --error:#C7362F;
  --clear:transparent;
  --tint-clear:rgba(192,74,130,0);
  --tint-rose:rgba(192,74,130,.04);
  --tint-apricot:rgba(233,163,126,.065);
  --win:#1C1B22;
  --win-raise:#23212A;
  --win-line:rgba(255,255,255,.08);
  --win-line-strong:rgba(255,255,255,.22);
  --win-text:#F3F1F6;
  --win-muted:rgba(243,241,246,.56);
  --win-hi:rgba(255,255,255,.12);
  --win-tag:rgba(255,255,255,.10);
  --dusk-1:#6E5A7E;
  --dusk-2:#C98BA8;
  --dusk-3:#F1C6A8;
  --glow-warm:rgba(255,228,214,.62);
  --glow-rose:rgba(250,210,228,.52);
  --glow-clear:rgba(255,228,214,0);
  --rim:rgba(255,230,216,.55);
  --rim-clear:rgba(255,230,216,0);
  --sky-top:#ECE9F2;
  --sky-low:#F6E7E0;
  --sun:#FBE2D0;
  --hill-far-a:#C6BED4;
  --hill-far-b:#DCD6E4;
  --hill-near-a:#AEBDAC;
  --hill-near-b:#C8D1C2;
  --field-a:#D7D9CB;
  --field-b:#C3C9B6;
  --road-a:#A39BAB;
  --road-b:#D4CED8;
  --lane:#F7F3F4;
  --mist:#F7EFEC;
  --glass:rgba(255,255,255,.64);
  --glass-edge:rgba(255,255,255,.9);
  --flag-red:#C23B36;
  --flag-blue:#2E4580;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(23,22,27,.16);
  --veil:rgba(23,22,27,.24);
  --shadow-pill:0 6px 16px -10px rgba(192,74,130,.30);
  --shadow-cta:0 14px 28px -14px rgba(23,22,27,.55);
  --shadow-board:0 34px 70px -34px rgba(192,74,130,.32),0 2px 10px -4px rgba(110,90,126,.12);
  --shadow-win:0 48px 96px -24px rgba(74,44,92,.14),0 26px 48px -18px rgba(30,18,40,.42);
  --shadow-glass:0 20px 44px -16px rgba(192,74,130,.20),0 2px 8px -2px rgba(110,90,126,.10);
  --shadow-float:0 18px 36px -14px rgba(192,74,130,.30),0 4px 10px rgba(23,22,27,.18);
  --shadow-panel:0 24px 60px -30px rgba(192,74,130,.10);
  --r-xs:6px;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-pill:999px;
  --f-display:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --f-body:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-bold:600;
  --gutter:32px;
  --content-width:1312px;
  --reading-width:800px;
  --header-height:68px;
  --toc-height:64px;
  --anchor-offset:148px;
  --display-size:clamp(52px,4.6vw,66px);
  --h2-size:40px;
  --h3-size:22px;
  --body-size:16px;
  --small-size:14px;
  --motion-short:.2s;
  --motion-reveal:.35s;
}
*,*::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{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:var(--body-size);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--tint-rose)}
button{background:var(--panel);border:1px solid var(--border)}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{margin:0;padding:0;list-style:none}
p,h1,h2,h3,h4,figure,blockquote{margin:0}
h1,h2,h3{font-family:var(--f-display);font-weight:var(--weight-regular);overflow-wrap:break-word;text-wrap:balance}
h1{font-size:var(--display-size);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--h2-size);line-height:1.2;letter-spacing:-.02em}
h3{font-size:var(--h3-size);line-height:1.3;letter-spacing:-.01em}
strong,b{font-weight:var(--weight-bold)}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px;border-radius:var(--r-xs)}
[hidden]{display:none!important}
:where(main,section,article,aside,div,li,figure){min-width:0}
code{font-family:var(--f-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
.vh{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.no-break{white-space:nowrap}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:88px;padding-bottom:88px}
.section-heading{margin-bottom:32px}
.stack{display:grid;gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-five{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:inset 0 1px 0 var(--glass-edge),var(--shadow-panel)}
.prose{overflow-wrap:anywhere}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose table{margin-block:20px}
.prose h2{margin-top:56px;margin-bottom:24px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose a:not(.btn):not(.btn-solid){text-decoration:underline;text-underline-offset:4px}
.skip{position:absolute;left:16px;top:-64px;z-index:100;padding:10px 16px;border-radius:var(--r-sm);background:var(--text);color:var(--on-dark);font-size:var(--small-size)}
.skip:focus{top:12px}
.btn,.btn-solid,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 26px;border-radius:var(--r-pill);font-size:var(--body-size);font-weight:var(--weight-medium);line-height:1.5;flex-shrink:0;white-space:nowrap;max-width:100%;text-align:center;transition:background-color var(--motion-short),color var(--motion-short),transform var(--motion-short)}
.btn,.btn-solid,.btn-primary{border:1px solid var(--text);background:var(--text);color:var(--on-dark);box-shadow:var(--shadow-cta)}
.btn:hover,.btn-solid:hover,.btn-primary:hover{background:var(--text-hover);transform:translateY(-1px)}
.btn-solid{height:52px;padding:0 32px;letter-spacing:.01em}
.btn-secondary{border:1px solid var(--border);background:var(--panel);color:var(--text)}
.btn-secondary:hover{background:var(--panel-2)}
.btn:disabled,.btn-secondary:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.link-u{display:inline-flex;align-items:center;min-height:32px;padding:6px 2px;font-size:var(--body-size);text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:7px}
.link-u:hover{color:var(--accent-dark)}
.cta-row{margin-top:28px;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:28px}
.topbar,#site-header{position:relative;z-index:80}
.topbar-in{height:var(--header-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--f-display);font-size:19px;font-weight:var(--weight-medium);letter-spacing:-.01em;white-space:nowrap;flex-shrink:0}
.brand-mark{width:28px;height:28px;display:block;flex:none}
.brand-zh{color:var(--muted);font-weight:var(--weight-regular)}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav a{display:block;padding:7px 12px;border-radius:var(--r-pill);font-size:var(--small-size);line-height:20px;color:var(--muted);white-space:nowrap}
.mainnav a:hover{color:var(--text);background:var(--panel-2)}
.mainnav a[aria-current="page"]{background:var(--panel);color:var(--text);box-shadow:0 0 0 1px var(--border),var(--shadow-pill)}
.actions{display:flex;align-items:center;gap:8px;margin-left:auto;flex-shrink:0}
.language{position:relative}
.lang{appearance:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;width:auto;padding:7px 10px;border:0;background:var(--clear);font-size:var(--small-size);color:var(--muted);border-radius:var(--r-pill);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang-caret{font-size:10px;line-height:1}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:95;min-width:172px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:var(--shadow-glass)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--small-size);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 18px;border-radius:var(--r-pill);border:1px solid var(--text);background:var(--panel);font-size:var(--small-size);font-weight:var(--weight-medium);white-space:nowrap}
.login:hover{background:var(--text);color:var(--on-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none}
.menu-veil{display:none}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.footer{border-top:1px solid var(--border);background:linear-gradient(180deg,var(--panel-2),var(--bg));padding-top:56px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-description{margin-top:18px;max-width:32em;color:var(--muted);font-size:var(--small-size)}
.footer-title{font-size:var(--body-size);font-weight:var(--weight-medium);margin-bottom:16px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--small-size);color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:36px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:var(--small-size);color:var(--muted)}
.footer-legal{display:flex;gap:24px;flex-wrap:wrap}
.reveal{transition:opacity var(--motion-reveal) ease,transform var(--motion-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status + *{margin-top:24px}
@media(max-width:1280px){
  .topbar-in{gap:16px}
  .mainnav a{padding-inline:9px}
}
@media(max-width:1180px){
  .mainnav{display:none}
  .menu-toggle{display:inline-flex}
  .actions{margin-left:auto}
  .mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));z-index:78;overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
  .mobile-drawer.is-open{display:block}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);color:var(--muted)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"],.mobile-drawer a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
  .menu-veil.is-open{display:block;position:fixed;inset:var(--header-height) 0 0;z-index:77;background:var(--veil);border:0}
}
@media(max-width:768px){
  :root{--gutter:18px;--h2-size:30px;--h3-size:21px;--display-size:36px}
  h1{line-height:1.2}
  .section{padding-top:64px;padding-bottom:64px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .panel,.card{padding:22px}
  .topbar-in{gap:8px}
  .actions{gap:6px;margin-left:auto}
  .brand{gap:7px;font-size:17px}
  .lang{padding-inline:7px;font-size:12px}
  .login{padding-inline:13px;font-size:13px}
  .btn-solid{height:48px;padding-inline:26px}
  .cta-row{margin-top:24px;gap:20px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt{transform:none}
  .stage,.decorated{overflow-x:clip;max-width:100%}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{font-size:15px;gap:5px}
  .brand-mark{width:24px;height:24px}
  .actions{gap:4px}
  .lang{padding-inline:5px}
  .login{padding-inline:10px}
  .menu-toggle{min-width:44px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  .btn,.btn-solid,.btn-primary,.btn-secondary{transition:none}
}