:root{
  --bg:#E9EAF5;
  --bg-top:#F1F2FA;
  --bg-bottom:#E3E5F3;
  --panel:#F8F8FD;
  --panel-2:#DCDEEF;
  --panel-sunk:#EEEFF8;
  --panel-tab:#E7E9F5;
  --border:#C9CCE2;
  --border-soft:#E1E3F0;
  --border-strong:#A9AECB;
  --accent:#0E6F94;
  --accent-dark:#0A5272;
  --accent-2:#2F8DB3;
  --text:#151A2E;
  --ink:#151A2E;
  --muted:#565C78;
  --faint:#7C819C;
  --on-ink:#F8F8FD;
  --success:#1F8A5B;
  --warn:#B7791F;
  --error:#C2413A;
  --bubble:#E2E3F6;
  --accent-tint:color-mix(in srgb,var(--accent) 11%,var(--panel));
  --success-tint:color-mix(in srgb,var(--success) 12%,var(--panel));
  --warn-tint:color-mix(in srgb,var(--warn) 14%,var(--panel));
  --error-tint:color-mix(in srgb,var(--error) 10%,var(--panel));
  --warn-ink:color-mix(in srgb,var(--warn) 80%,var(--text));
  --dot-r:color-mix(in srgb,var(--error) 78%,var(--panel));
  --dot-y:color-mix(in srgb,var(--warn) 78%,var(--panel));
  --dot-g:color-mix(in srgb,var(--success) 78%,var(--panel));
  --atmo-a:rgba(14,111,148,.06);
  --atmo-b:rgba(118,122,196,.06);
  --highlight:rgba(255,255,255,.92);
  --hover-wash:rgba(21,26,46,.05);
  --veil:rgba(21,26,46,.3);
  --shadow-board:0 1px 2px rgba(14,111,148,.06),0 14px 32px -14px rgba(14,111,148,.10),0 48px 96px -36px rgba(14,111,148,.10);
  --shadow-win:0 18px 44px -22px rgba(14,111,148,.12);
  --shadow-float:0 2px 6px rgba(14,111,148,.08),0 18px 40px -14px rgba(14,111,148,.14);
  --shadow-ink:0 10px 24px -10px rgba(21,26,46,.45);
  --shadow-switch:0 1px 2px rgba(10,82,114,.35);
  --flag-white:#FFFFFF;
  --flag-red:#D52B35;
  --flag-navy:#33356E;
  --flag-black:#1B1B1B;
  --flag-gold:#F7C600;
  --radius:8px;
  --radius-sm:6px;
  --radius-bubble:10px;
  --radius-pill:999px;
  --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","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --body-size:17px;
  --display-size:64px;
  --heading-size:36px;
  --small-size:14px;
  --weight-display:800;
  --leading:1.7;
  --tracking-display:-.03em;
  --gutter:24px;
  --content-width:1288px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-5:40px;
  --space-6:48px;
  --space-8:64px;
  --space-9:72px;
  --header-height:64px;
  --header-edge:104px;
  --anchor-offset:128px;
  --toc-offset:16px;
  --toc-landing:88px;
  --ease: .2s ease;
  --reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:var(--body-size);line-height:var(--leading);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
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(--hover-wash)}
button{border:0}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.5}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-weight:var(--weight-display);font-size:clamp(52px,5vw,64px);line-height:1.1;letter-spacing:var(--tracking-display)}
h2{font-size:var(--heading-size);line-height:1.25;font-weight:var(--weight-display);letter-spacing:-.02em;margin:0 0 var(--space-3)}
h3{font-size:22px;line-height:1.4;margin:0 0 var(--space-2)}
p + p{margin-top:var(--space-2)}
strong{font-weight:700}
code{font-family:var(--font-mono);overflow-wrap:anywhere;font-size:.88em;background:var(--panel-2);border-radius:var(--radius-sm);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;background:var(--ink);color:var(--on-ink);border-radius:var(--radius);padding:var(--space-3);font-size:14px}
pre code{background:transparent;padding:0;color:inherit;overflow-wrap:normal;white-space:pre}
blockquote{margin:var(--space-3) 0}
.wrap{width:100%;max-width:var(--content-width);padding-inline:var(--gutter);margin-inline:auto}
.wrap > *,section > *,article > *,main > *{min-width:0}
.section{padding-top:var(--space-9);padding-bottom:var(--space-9)}
.section-head{max-width:760px;margin-bottom:var(--space-4)}
.section-head p,.muted{color:var(--muted)}
.prose{max-width:820px}
.prose p,.prose li{overflow-wrap:anywhere}
.prose h2{margin-top:var(--space-8)}
.prose h3{margin-top:var(--space-4)}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose ul,.prose ol{padding-left:var(--space-3);list-style:revert;margin-block:var(--space-2)}
.prose li + li{margin-top:var(--space-1)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.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}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono)}
.i{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.pf{width:16px;height:16px;flex:none;fill:currentColor}
.flag{width:21px;height:14px;flex:none;overflow:hidden;border-radius:2px}
.fw{fill:var(--flag-white)}
.fr{fill:var(--flag-red)}
.fn{fill:var(--flag-navy)}
.fk{fill:var(--flag-black)}
.fg{fill:var(--flag-gold)}
.ff{fill:none;stroke:var(--text);stroke-opacity:.16;stroke-width:1}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 24px;border-radius:var(--radius-pill);font-size:16px;font-weight:700;line-height:1.4;white-space:nowrap;flex-shrink:0;transition:transform var(--ease),background var(--ease),box-shadow var(--ease)}
.btn .i{width:18px;height:18px}
.btn--solid,.btn-primary{background:var(--ink);color:var(--on-ink);box-shadow:var(--shadow-ink)}
.btn--solid:hover,.btn-primary:hover{transform:translateY(-1px)}
.btn--line,.btn-secondary{border:1.5px solid var(--text);color:var(--text);background:transparent}
.btn--line:hover,.btn-secondary:hover{background:var(--panel)}
.btn:active{transform:translateY(0)}
.btn--small{min-height:36px;padding:7px 16px;font-size:14px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:inset 0 1px 0 var(--highlight),var(--shadow-win);padding:var(--space-3);min-width:0}
.panel--sunk{background:var(--panel-2)}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.grid-five{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:var(--space-2)}
.reveal{transition:opacity var(--reveal-time),transform var(--reveal-time)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono);text-align:right}
#server-status{display:block;position:static;min-height:120px;max-width:100%;overflow:hidden;margin-block:var(--space-3)}
#server-status + *{margin-top:var(--space-4)}
.announce{position:relative;background:var(--ink);color:var(--on-ink)}
.announce__inner{min-height:40px;display:flex;align-items:center;justify-content:center;gap:12px;padding:0 56px;font-size:14px;line-height:1.4;font-weight:500}
.announce__btn{display:inline-flex;align-items:center;justify-content:center;min-height:26px;padding:3px 12px;border-radius:var(--radius-pill);background:var(--accent);color:var(--on-ink);font-size:13px;font-weight:700;transition:background var(--ease);white-space:nowrap}
.announce__btn:hover{background:var(--accent-dark)}
.announce__close{position:absolute;right:20px;top:50%;width:28px;height:28px;margin-top:-14px;display:grid;place-items:center;border-radius:var(--radius-sm);cursor:pointer;background:transparent;color:var(--on-ink);opacity:.78}
.announce__close:hover{opacity:1}
.announce-toggle{position:absolute;opacity:0;pointer-events:none}
.announce-toggle:checked + .announce{display:none}
.topbar{position:relative;z-index:52;background:var(--bg-top)}
.topbar__inner{height:64px;display:flex;align-items:center;gap:20px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand img{width:32px;height:32px;flex:none}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.02em;line-height:1}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav__list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px;max-width:100%}
.nav__more{position:relative;flex-shrink:0}
.nav__more-toggle{cursor:pointer}
.nav__more-toggle::after{content:"▾";font-size:12px}
.nav__more-menu{position:absolute;right:0;top:calc(100% + 6px);z-index:60;min-width:210px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-float)}
.nav__more-menu .nav__link{min-height:40px}
.nav__link{display:flex;align-items:center;gap:6px;min-height:34px;padding:7px 10px;border-radius:var(--radius);font-size:14px;line-height:1.4;font-weight:500;color:var(--muted);white-space:nowrap;transition:color var(--ease),background var(--ease)}
.nav__link:hover{color:var(--text);background:var(--hover-wash)}
.nav__link[aria-current="page"]{color:var(--text);font-weight:600;background:var(--panel);box-shadow:inset 0 0 0 1px var(--border)}
.nav__text{line-height:1.4}
.topbar__tools{display:flex;align-items:center;gap:12px;flex-shrink:0}
.lang{position:relative}
.lang__button,.lang summary{list-style:none;display:flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:0 10px;border-radius:var(--radius);font-size:14px;color:var(--muted);cursor:pointer;background:transparent;white-space:nowrap}
.lang__button span{white-space:nowrap}
.lang summary::-webkit-details-marker{display:none}
.lang__button:hover,.lang summary:hover{background:var(--hover-wash);color:var(--text)}
.lang__menu{position:absolute;right:0;top:calc(100% + 6px);z-index:60;min-width:160px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-float)}
.lang__menu a{display:flex;align-items:center;min-height:36px;padding:6px 10px;border-radius:var(--radius-sm);font-size:14px;line-height:1.5}
.lang__menu a:hover,.lang__menu a[aria-current="true"]{background:var(--panel-sunk)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:7px 18px;border-radius:var(--radius-pill);border:1px solid var(--text);background:var(--panel);font-size:14px;font-weight:700;white-space:nowrap}
.btn-login:hover{background:var(--panel-sunk)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:transparent;color:var(--text);border-radius:var(--radius)}
.menu-toggle .i{width:22px;height:22px}
.nav-drawer{position:fixed;z-index:51;top:var(--header-edge);right:0;left:0;height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;gap:12px;border-radius:var(--radius);font-size:16px}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;z-index:50;inset:var(--header-edge) 0 0;background:var(--veil)}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:var(--space-8);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--space-6)}
.footer-brand p{font-size:15px;color:var(--muted);margin-top:var(--space-2);max-width:29em}
.footer-title{font-size:14px;font-weight:700;margin:0 0 var(--space-2)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:var(--space-4);padding-top:var(--space-3);border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:var(--space-3);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;gap:24px}
@media(max-width:1180px){
  .nav__link{padding:7px;font-size:13.5px}
  .topbar__inner{gap:12px}
}
@media(max-width:1080px){
  .nav__text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
  .nav__link{padding:8px}
}
@media(max-width:960px){
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{gap:24px}
}
@media(max-width:768px){
  :root{--display-size:40px;--heading-size:28px;--space-9:48px}
  h1{font-size:40px}
  .topbar__inner{gap:10px}
  .nav{display:none}
  .topbar__tools{margin-left:auto;gap:6px}
  .menu-toggle{display:inline-flex}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr}
  .nav__text{position:static;width:auto;height:auto;overflow:visible;clip:auto}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .announce__inner{justify-content:flex-start;padding:8px 48px 8px 16px;font-size:12px;gap:8px}
  .announce__close{right:12px}
  .brand{gap:6px}
  .brand img{width:28px;height:28px}
  .brand__name{font-size:18px}
  .topbar__inner{gap:6px}
  .lang__button,.lang summary{font-size:12px;padding-inline:5px;gap:4px}
  .btn-login{padding-inline:12px;font-size:13px}
  .btn-login .i{display:none}
  .topbar__tools{gap:2px}
  .panel,.card{padding:var(--space-2)}
  .section{max-width:100%}
}
@media(max-width:359px){
  .brand__name{font-size:16px}
  .brand img{width:24px;height:24px}
  .lang__button > .i,.lang summary > .i{display:none}
  .btn-login{padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}