:root {
  --bg:#E6EEF7;
  --bg-panel:#F7FAFE;
  --bg-panel2:#D9E5F1;
  --border:#C9D7E6;
  --accent:#1A5BF0;
  --accent-dark:#1240B8;
  --text:#121A2B;
  --text-muted:#55627A;
  --success:#1F9D63;
  --warn:#C98512;
  --error:#D0423A;
  --cyan:#7FC4F5;
  --hero-top:#EEF4FB;
  --hero-bottom:#DCE7F3;
  --navy:#0F2A6E;
  --ink-deep:#0A1020;
  --client:#141B2A;
  --client-side:#101624;
  --client-raise:#1B2437;
  --client-text:#E3EAF6;
  --client-muted:#8391AA;
  --white:#FFFFFF;
  --on-dark:#FFFFFF;
  --laurel:#8C98AE;
  --flag-red:#D6262F;
  --flag-blue:#22408F;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(18,26,43,.14);
  --grid-dot:rgba(26,91,240,.05);
  --accent-8:rgba(26,91,240,.08);
  --accent-10:rgba(26,91,240,.10);
  --accent-14:rgba(26,91,240,.14);
  --accent-24:rgba(26,91,240,.24);
  --cyan-30:rgba(127,196,245,.30);
  --cyan-40:rgba(127,196,245,.40);
  --success-soft:rgba(31,157,99,.22);
  --warn-soft:rgba(201,133,18,.24);
  --hi-light:rgba(255,255,255,.9);
  --hi-dark:rgba(255,255,255,.08);
  --hi-mid:rgba(255,255,255,.14);
  --hi-strong:rgba(255,255,255,.22);
  --on-dark-soft:rgba(255,255,255,.78);
  --stripe:rgba(255,255,255,.045);
  --shadow-ink:rgba(6,12,26,.5);
  --btn-ink-shadow:rgba(18,26,43,.32);
  --veil:rgba(18,26,43,.32);
  --clear:transparent;
  --dots:radial-gradient(circle at 1px 1px,var(--grid-dot) 1.3px,var(--clear) 1.7px);
  --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;
  --r-plate:32px;
  --r-window:14px;
  --r-card:12px;
  --r-sm:8px;
  --r-item:7px;
  --r-line:10px;
  --r-flag:3px;
  --r-flag-sm:2.5px;
  --r-round:50%;
  --r-pill:999px;
  --gutter:24px;
  --content:1200px;
  --head-height:62px;
  --anchor-gap:80px;
  --toc-offset:16px;
  --toc-landing:96px;
  --shadow-panel:0 20px 52px -24px var(--accent-10),inset 0 1px 0 var(--hi-light);
  --weight-body:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-brand:800;
  --weight-display:900;
  --size-body:16px;
  --size-small:14px;
  --size-meta:12px;
  --size-h1:clamp(52px,5vw,64px);
  --size-h2:clamp(28px,3vw,40px);
  --size-h3:22px;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --tracking-brand:-.02em;
  --ease-out:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-body);color:var(--text);line-height:1.65;background-color:var(--bg);background-image:var(--dots);background-size:24px 24px;background-attachment:fixed;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:inherit}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--accent-8)}
button{color:inherit}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:var(--tracking-cjk);margin:0 0 24px}
h2{font-size:var(--size-h2);font-weight:var(--weight-brand);line-height:1.25;letter-spacing:var(--tracking-cjk);margin:0 0 24px}
h3{font-size:var(--size-h3);font-weight:var(--weight-bold);line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
ul,ol{padding-left:24px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-card);background:var(--client);color:var(--client-text)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th{text-align:left}
input,textarea,select{max-width:100%;border:1px solid var(--border);border-radius:var(--r-sm);padding:10px 14px;background:var(--bg-panel);color:var(--text)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:760px;margin:0 auto 32px;text-align:center}
.section-head p,.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.panel,.card{min-width:0;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:var(--shadow-panel);padding:24px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.prose{max-width:800px;margin-inline:auto;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a:not(.btn){color:var(--accent-dark);text-underline-offset:4px}
.prose img{border-radius:var(--r-card)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.fr{fill:var(--flag-red)}
.fw{fill:var(--flag-white)}
.fb{fill:var(--flag-blue)}
.stop-a,.stop-c{stop-color:var(--accent)}
.stop-b{stop-color:var(--accent-dark)}
.stop-d{stop-color:var(--cyan)}
.ico{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border:0;border-radius:var(--r-pill);font-size:var(--size-body);font-weight:var(--weight-bold);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform .25s ease,box-shadow .25s ease}
.btn svg{width:18px;height:18px;flex:none}
.btn-primary{position:relative;isolation:isolate;padding:0 24px 0 22px;color:var(--on-dark);background:var(--text);box-shadow:0 16px 30px -16px var(--btn-ink-shadow)}
.btn-primary::before{content:"";position:absolute;inset:0 0 -2px;border-radius:inherit;z-index:-1;background:linear-gradient(90deg,var(--accent),var(--cyan))}
.btn-primary::after{content:"";position:absolute;inset:0;border-radius:inherit;z-index:-1;background:var(--text)}
.btn-primary .bolt{fill:var(--white)}
.btn-primary .arr{width:16px;height:16px;fill:none;stroke:var(--white);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn-primary:hover,.btn-primary.is-hover{transform:translateY(-1px);box-shadow:0 18px 34px -14px var(--accent-24)}
.btn-ghost{color:var(--text);background:var(--bg-panel);box-shadow:0 0 0 1.5px var(--border),inset 0 1px 0 var(--hi-light)}
.btn-ghost:hover,.btn-ghost.is-hover{box-shadow:0 0 0 1.5px var(--text-muted),inset 0 1px 0 var(--hi-light)}
.btn-ghost .chev{width:14px;height:14px;fill:none;stroke:var(--text-muted);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn:active,.btn.is-active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.btn-small{min-height:40px;padding-inline:18px;font-size:var(--size-small)}
.cta-row{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:14px;margin-bottom:16px}
.site-head,#site-header{position:relative;z-index:50}
.head-in{max-width:1280px;margin:0 auto;padding:0 24px;height:var(--head-height);display:flex;align-items:center;gap:20px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none}
.brand-mark{width:30px;height:30px;display:block}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-brand);font-size:18px;letter-spacing:var(--tracking-brand)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-list a{display:flex;align-items:center;gap:6px;padding:7px 10px;min-height:36px;border-radius:var(--r-pill);font-size:var(--size-small);font-weight:var(--weight-medium);color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color .2s,background-color .2s}
.nav-list a:hover{color:var(--text);background:var(--accent-8)}
.nav-list a[aria-current="page"]{color:var(--text);background:var(--bg-panel);box-shadow:inset 0 0 0 1px var(--hi-light),0 0 0 1px var(--border),0 6px 16px -10px var(--accent-24)}
.nav-dot{width:6px;height:6px;flex:none;border-radius:var(--r-round);background:var(--accent);box-shadow:0 0 0 3px var(--accent-14)}
.nav-new{font-size:10px;font-weight:var(--weight-bold);line-height:1;letter-spacing:.02em;padding:4px 7px;border-radius:var(--r-pill);background:var(--cyan-30);color:var(--accent-dark)}
.head-tools{display:flex;align-items:center;gap:8px;flex:none;margin-left:auto}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;min-width:44px;width:auto;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--clear);color:var(--text-muted);font-size:13px;font-weight:var(--weight-medium);white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--accent-8);color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:70;width:192px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-window);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);text-decoration:none;font-size:var(--size-small);color:var(--text)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-8);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:38px;min-width:64px;padding:0 18px 0 14px;border-radius:var(--r-pill);background:var(--bg-panel);color:var(--text);text-decoration:none;font-size:var(--size-small);font-weight:var(--weight-semibold);box-shadow:0 0 0 1px var(--border),inset 0 1px 0 var(--hi-light),0 8px 18px -12px var(--accent-24)}
.login:hover{box-shadow:0 0 0 1px var(--accent),inset 0 1px 0 var(--hi-light)}
.menu-btn{display:none;min-width:44px;min-height:44px;border:0;border-radius:var(--r-pill);background:var(--bg-panel);color:var(--text);box-shadow:0 0 0 1px var(--border);align-items:center;justify-content:center}
.menu-btn .ico{width:20px;height:20px}
.menu-drawer{display:none}
.menu-veil{position:fixed;inset:var(--head-height) 0 0;z-index:51;border:0;background:var(--veil);width:100%}
html.nav-open{overflow:hidden}
.site-foot{border-top:1px solid var(--border);background-color:var(--bg-panel2);background-image:var(--dots);background-size:24px 24px;padding-top:48px;padding-bottom:24px}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px}
.foot-brand{min-width:0}
.foot-brand p{max-width:340px;margin-top:16px;color:var(--text-muted);font-size:var(--size-small)}
.foot-title{font-size:var(--size-small);font-weight:var(--weight-bold);margin:0 0 14px}
.foot-links{display:flex;flex-wrap:wrap;gap:6px 20px;list-style:none;margin:0;padding:0}
.foot-links a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--size-small);text-decoration:none;color:var(--text-muted)}
.foot-links a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.foot-languages{display:flex;flex-wrap:wrap;gap:6px 20px;margin-top:32px}
.foot-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--size-small);color:var(--text-muted)}
.foot-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--size-meta);color:var(--text-muted)}
.foot-legal{display:flex;gap:20px;flex-wrap:wrap}
.foot-legal a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity .55s ease,transform .55s var(--ease-out)}
.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%;min-height:120px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:24px}
@media(min-width:1121px) and (max-width:1270px){
  .head-in{gap:12px;padding-inline:20px}
  .nav-list a{padding-inline:7px;gap:5px}
  .head-tools{gap:6px}
  .lang{padding-inline:8px}
}
@media(max-width:1120px){
  .nav{display:none}
  .head-tools{margin-left:auto}
  .menu-btn{display:inline-flex}
  .menu-drawer{position:fixed;top:var(--head-height);left:0;right:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));z-index:52;overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
  .menu-drawer:not([hidden]){display:block}
  .menu-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;gap:10px;border-radius:var(--r-sm);text-decoration:none;color:var(--text)}
  .menu-drawer a:hover,.menu-drawer a[aria-current]{background:var(--accent-8)}
  .drawer-language{padding-top:16px;margin-top:16px;border-top:1px solid var(--border)}
}
@media(max-width:768px){
  :root{--size-h1:clamp(28px,7vw,40px);--size-h2:clamp(26px,5vw,32px)}
  .grid-three{grid-template-columns:1fr}
  .section{padding-top:48px;padding-bottom:48px}
  .foot-grid{grid-template-columns:1fr;gap:24px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .head-in{padding-inline:16px;gap:8px}
  .brand{gap:6px}
  .brand-en{font-size:16px}
  .brand-mark{width:26px;height:26px}
  .head-tools{gap:6px;margin-left:auto}
  .lang{padding-inline:6px;font-size:12px}
  .login{padding-inline:12px;min-width:54px;font-size:13px}
  .login .ico{display:none}
  .panel,.card{padding:20px}
  .tilt,.tilt-card,[data-tilt]{transform:none}
  .decoration,.stripe-halo{max-width:100%}
}
@media(max-width:359px){
  .head-in{gap:5px}
  .head-tools{gap:4px}
  .brand-en{font-size:14px}
  .brand-mark{width:24px;height:24px}
  .lang{font-size:11px;padding-inline:4px}
  .login{min-width:48px;padding-inline:8px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}