:root {
  --c-bg:#E6EEF6;
  --c-panel:#F7FAFD;
  --c-panel-2:#D6E2EE;
  --c-border:#C9D7E4;
  --c-border-soft:rgba(201,215,228,.72);
  --c-accent:#2AD49A;
  --c-accent-hi:#4FE0B0;
  --c-accent-dark:#0A7A55;
  --c-text:#0F1A24;
  --c-muted:#566472;
  --c-success:#139E67;
  --c-warn:#C9820F;
  --c-error:#CF4437;
  --c-white:#FFFFFF;
  --c-transparent:transparent;
  --c-hero-top:#EEF4FA;
  --c-hero-bottom:#E1EAF3;
  --c-glow:rgba(42,212,154,.06);
  --c-glow-mid:rgba(42,212,154,.035);
  --c-glow-0:rgba(42,212,154,0);
  --c-hl:rgba(42,212,154,.22);
  --c-mint-wash:#E9F8F1;
  --c-accent-04:rgba(42,212,154,.04);
  --c-accent-08:rgba(42,212,154,.08);
  --c-accent-14:rgba(42,212,154,.14);
  --c-accent-16:rgba(42,212,154,.16);
  --c-accent-26:rgba(42,212,154,.26);
  --c-success-16:rgba(19,158,103,.16);
  --c-band-1:#7FD9B4;
  --c-band-2:#73CEA9;
  --c-band-3:#58B593;
  --c-band-4:#2A6050;
  --c-band-5:#173D33;
  --c-band-ink:#0F2A24;
  --c-on-band:#0F2A24;
  --c-on-band-soft:#1B3C33;
  --c-on-dark:#EEF8F3;
  --c-on-dark-soft:rgba(238,248,243,.72);
  --c-ticket-dash:rgba(15,42,36,.34);
  --c-chrome-top:#FCFDFF;
  --c-chrome-bottom:#EDF3F9;
  --shadow-accent:rgba(42,212,154,.10);
  --shadow-accent-strong:rgba(42,212,154,.22);
  --shadow-band:rgba(10,122,85,.26);
  --shadow-deep:rgba(8,26,21,.30);
  --shadow-deep-soft:rgba(8,26,21,.16);
  --shadow-ink:rgba(15,26,36,.08);
  --groove:rgba(15,26,36,.09);
  --hi-edge:rgba(255,255,255,.95);
  --hi-edge-soft:rgba(255,255,255,.45);
  --hi-edge-dark:rgba(127,217,180,.24);
  --band-edge:rgba(255,255,255,.38);
  --c-veil:rgba(15,26,36,.28);
  --flag-red:#D52B1E;
  --flag-white:#FFFFFF;
  --flag-blue:#24397A;
  --flag-navy:#17296B;
  --flag-edge:rgba(15,26,36,.14);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-card:10px;
  --r-btn:8px;
  --r-band:16px;
  --r-flag:4px;
  --r-small:6px;
  --r-bubble:12px;
  --r-tail:3px;
  --r-pill:999px;
  --r-circle:50%;
  --w-max:1280px;
  --w-reading:800px;
  --gutter:32px;
  --fs-body:16px;
  --fs-h1:66px;
  --fs-h2:40px;
  --fs-h3:24px;
  --fs-sub:18px;
  --fw-display:900;
  --fw-bold:700;
  --tracking-display:-.03em;
  --header-height:72px;
  --toc-height:64px;
  --anchor-offset:96px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-6:48px;
  --space-8:64px;
  --space-12:96px;
  --ease-fast:.2s;
  --reveal-time:.35s;
}
*,*::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(--c-bg);color:var(--c-text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{color:inherit;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
h1,h2,h3,h4,p,blockquote,figure{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);font-weight:var(--fw-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);font-weight:var(--fw-display);line-height:1.22;letter-spacing:-.02em}
h3{font-size:var(--fs-h3);font-weight:800;line-height:1.35}
ul{list-style:none;margin:0;padding:0}
ol{padding-inline-start:1.5em}
li::marker{color:var(--c-accent-dark)}
:focus-visible{outline:2px solid var(--c-accent-dark);outline-offset:3px;border-radius:var(--r-small)}
[hidden]{display:none!important}
::selection{background:var(--c-hl);color:var(--c-text)}
.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}
.wrap{width:100%;max-width:calc(var(--w-max) + 2 * var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--w-reading) + 2 * var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-12);padding-bottom:var(--space-12)}
.section-head{margin-bottom:var(--space-4);max-width:48em}
.section-head p{margin-top:var(--space-2);color:var(--c-muted)}
.stack{display:grid;gap:var(--space-3)}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-4)}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-3)}
.grid-two>*,.grid-three>*,.stack>*,.wrap>*{min-width:0}
.muted{color:var(--c-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-link{display:inline-flex;align-items:center;gap:var(--space-1);min-height:24px;color:var(--c-accent-dark);font-weight:var(--fw-bold)}
.text-link:hover{text-decoration:underline;text-underline-offset:4px}
.panel,.card{min-width:0;padding:var(--space-4);background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:inset 0 1px 0 var(--hi-edge),0 18px 32px var(--shadow-accent)}
.groove{padding:var(--space-3);background:var(--c-panel-2);border-radius:var(--r-btn);box-shadow:inset 0 1px 3px var(--groove)}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:1.2em}
.prose ul{list-style:disc;padding-inline-start:1.4em}
.prose h2{margin-top:var(--space-8);margin-bottom:var(--space-3)}
.prose h3{margin-top:var(--space-4);margin-bottom:var(--space-2)}
.prose a:not(.btn){color:var(--c-accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;color:var(--c-text);background:var(--c-panel-2);border-radius:var(--r-flag);padding:.1em .3em}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:var(--space-3);background:var(--c-panel-2);border-radius:var(--r-btn);-webkit-overflow-scrolling:touch}
pre code{padding:0;white-space:pre;overflow-wrap:normal;background:var(--c-transparent)}
input,select,textarea{max-width:100%;padding:12px 14px;background:var(--c-panel);color:var(--c-text);border:1px solid var(--c-border);border-radius:var(--r-btn)}
.btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:10px;min-height:52px;padding:12px 26px;border:1px solid var(--c-transparent);border-radius:var(--r-btn);font-family:var(--font-body);font-size:16px;font-weight:700;letter-spacing:.01em;line-height:1.5;white-space:nowrap;transition:box-shadow var(--ease-fast),border-color var(--ease-fast),background-color var(--ease-fast)}
.btn svg{display:block;width:18px;height:18px}
.btn-primary{background:linear-gradient(180deg,var(--c-accent-hi),var(--c-accent));color:var(--c-text);box-shadow:inset 0 1px 0 var(--hi-edge-soft),0 10px 24px var(--shadow-accent-strong)}
.btn-primary:hover,.btn-primary.is-hover{box-shadow:inset 0 1px 0 var(--hi-edge-soft),0 12px 28px var(--shadow-accent-strong),0 0 0 4px var(--c-accent-16)}
.btn-ghost,.btn-secondary{background:var(--c-panel);color:var(--c-text);border-color:var(--c-border);box-shadow:inset 0 1px 0 var(--hi-edge)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--c-accent-dark)}
.btn:active,.btn.is-active{box-shadow:inset 0 2px 5px var(--groove)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);border-color:var(--c-border);box-shadow:none}
.btn-small{min-height:40px;padding:8px 16px;font-size:14px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:grid;min-width:0;max-width:100%;overflow:hidden;margin-block:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
.decorative-section{position:relative;overflow-x:clip;max-width:100%}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.icon{display:inline-block;width:24px;height:24px;fill:currentColor}
.f-red{fill:var(--flag-red)}
.f-white{fill:var(--flag-white)}
.f-blue{fill:var(--flag-blue)}
.f-navy{fill:var(--flag-navy)}
.f-edge{fill:none;stroke:var(--flag-edge);stroke-width:1}
.f-ink{fill:var(--c-band-ink)}
.f-mint{fill:var(--c-accent)}
.uj-w{fill:none;stroke:var(--flag-white);stroke-width:2.2}
.uj-r{fill:none;stroke:var(--flag-red);stroke-width:.8}
.uj-w2{fill:none;stroke:var(--flag-white);stroke-width:3.2}
.uj-r2{fill:none;stroke:var(--flag-red);stroke-width:1.7}
.stop-a{stop-color:var(--c-accent-hi)}
.stop-b{stop-color:var(--c-accent-dark)}
.topbar{position:relative;z-index:50}
.topbar-in{position:relative;height:var(--header-height);display:flex;align-items:center;gap:48px}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand-mark{display:block;width:32px;height:32px}
.brand-word{font-family:var(--font-display);font-weight:900;font-size:20px;letter-spacing:-.02em;color:var(--c-text)}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:32px}
.mainnav a{display:block;padding:8px 0;font-size:15px;font-weight:500;color:var(--c-muted);white-space:nowrap;transition:color var(--ease-fast)}
.mainnav a:hover{color:var(--c-text)}
.mainnav a[aria-current="page"]{color:var(--c-text);font-weight:700}
.topbar-end{display:flex;align-items:center;gap:20px;flex-shrink:0;margin-left:auto}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:5px;width:auto;min-width:44px;min-height:40px;font-family:var(--font-body);font-size:14px;font-weight:500;color:var(--c-muted);background:var(--c-transparent);border:0;padding:8px 2px;cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--c-text)}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 8px);z-index:80;min-width:176px;padding:8px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:0 16px 32px var(--shadow-deep-soft)}
.lang-picker.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--c-accent-14);color:var(--c-accent-dark)}
.login-pill{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;height:40px;padding:0 24px;border-radius:var(--r-pill);background:var(--c-accent);color:var(--c-text);font-size:15px;font-weight:700;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-edge-soft),0 6px 16px var(--shadow-accent-strong);transition:box-shadow var(--ease-fast)}
.login-pill:hover{box-shadow:inset 0 1px 0 var(--hi-edge-soft),0 8px 22px var(--shadow-accent-strong),0 0 0 3px var(--c-accent-16)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--c-border);border-radius:var(--r-btn);background:var(--c-panel);color:var(--c-text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;flex-shrink:0}
.menu-toggle[aria-expanded="true"] .menu-line:first-child{transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] .menu-line:last-child{transform:translateY(-7px) rotate(-45deg)}
.nav-drawer{display:none;position:fixed;z-index:49;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--c-panel);padding:16px var(--gutter) 40px}
.nav-drawer ul{display:block;list-style:none;margin:0;padding:0}
.nav-drawer a{display:flex;align-items:center;min-height:48px;width:100%;padding:12px 16px;border-bottom:1px solid var(--c-border)}
.nav-drawer a[aria-current]{color:var(--c-accent-dark);font-weight:700}
.drawer-languages{margin-top:24px;border-top:1px solid var(--c-border)}
.nav-veil{display:none;position:fixed;z-index:48;inset:var(--header-height) 0 0;background:var(--c-veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:64px;padding-bottom:32px;border-top:1px solid var(--c-border);background:var(--c-panel-2)}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr) minmax(0,1.2fr);gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:25em;margin-top:16px;color:var(--c-muted);font-size:14px}
.footer-title{font-size:15px;font-weight:800;margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--c-accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;padding-top:32px;margin-top:32px;border-top:1px solid var(--c-border)}
.footer-languages a[aria-current]{font-weight:700;color:var(--c-accent-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-top:24px;color:var(--c-muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 24px}
@media(min-width:1181px) and (max-width:1320px){
  .topbar-in{gap:24px}
  .mainnav ul{gap:20px}
  .topbar-end{gap:12px}
}
@media(max-width:1180px){
  .mainnav{display:none}
  .topbar-in{gap:16px}
  .topbar-end{margin-left:auto;gap:14px}
  .menu-toggle{display:inline-flex}
  .nav-drawer.is-open{display:block}
  .nav-veil.is-open{display:block}
}
@media(max-width:768px){
  :root{--gutter:24px;--fs-h2:32px;--fs-h3:22px;--space-12:64px}
  h1{font-size:40px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .site-footer{padding-top:48px}
}
@media(max-width:640px){
  :root{--gutter:16px;--header-height:64px;--fs-h1:38px;--fs-h2:28px}
  .no-break{white-space:normal}
  h1{font-size:clamp(28px,8.5vw,40px)}
  .grid-two{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:24px}
  .tilt,.tilt-card,[data-tilt]{transform:none}
  .decorative-section{max-width:100%;overflow-x:clip}
  .topbar-in{flex-wrap:nowrap;gap:8px}
  .brand{gap:7px}
  .brand-mark{width:28px;height:28px}
  .brand-word{font-size:17px}
  .topbar-end{gap:8px;margin-left:auto}
  .lang{font-size:11px;gap:2px;padding:8px 0}
  .login-pill{height:36px;padding:0 13px;font-size:13px}
  .menu-toggle{padding:8px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:360px){
  .brand-word{font-size:15px}
  .brand-mark{width:24px;height:24px}
  .topbar-end{gap:5px}
  .login-pill{padding:0 10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{transition:none!important}
}