:root{
  --bg:#E5EFF3;
  --bg-top:#EEF5F8;
  --bg-bottom:#E1ECF1;
  --panel:#F7FBFC;
  --groove:#D6E6ED;
  --border:#C3D7E0;
  --border-soft:rgba(195,215,224,.7);
  --accent:#26D98A;
  --accent-dark:#0B7D55;
  --cyan:#0E8FA8;
  --text:#0C1E2B;
  --text-2:#22394A;
  --muted:#4E6573;
  --success:#1A9E5C;
  --warn:#C98212;
  --error:#D0413A;
  --ink-bar:#0B2F2C;
  --white:#FFFFFF;
  --mint-soft:#C9F2DE;
  --cyan-soft:#BDE6EF;
  --mint-wash:rgba(201,242,222,.7);
  --cyan-wash:rgba(189,230,239,.45);
  --cyan-tint:rgba(14,143,168,.10);
  --success-tint:rgba(26,158,92,.12);
  --announce-text:#E3F1EE;
  --announce-muted:rgba(227,241,238,.74);
  --grid-line:rgba(12,30,43,.04);
  --glow:rgba(255,255,255,.88);
  --glow-0:rgba(255,255,255,0);
  --hairline-hi:rgba(255,255,255,.95);
  --shell-edge:rgba(255,255,255,.45);
  --win-edge:rgba(12,30,43,.07);
  --glass:rgba(247,251,252,.62);
  --glass-edge:rgba(255,255,255,.78);
  --shadow-ink:rgba(12,30,43,.08);
  --shadow-accent:rgba(38,217,138,.14);
  --shadow-deep:rgba(11,125,85,.14);
  --shadow-cyan:rgba(14,143,168,.14);
  --cta-shadow:rgba(38,217,138,.38);
  --groove-inset:rgba(12,30,43,.07);
  --flag-red:#D0413A;
  --flag-blue:#22468C;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(12,30,43,.18);
  --veil:rgba(12,30,43,.36);
  --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-btn:4px;
  --r-sm:6px;
  --r-md:8px;
  --r-card:12px;
  --r-detail:20px;
  --r-shell:32px;
  --r-mobile-shell:24px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:24px;
  --content-width:1200px;
  --reading-width:820px;
  --header-edge:92px;
  --toc-offset:16px;
  --anchor-offset:88px;
  --shadow-panel:0 18px 48px -20px var(--shadow-cyan),inset 0 1px 0 var(--hairline-hi);
  --duration-fast:.2s;
  --duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html,body{margin:0;padding:0}
body{font-family:var(--font-body);font-size:16px;line-height:1.7;color:var(--text);background:var(--bg);-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{cursor:not-allowed}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3{font-family:var(--font-display);font-weight:500;text-wrap:balance}
h1{font-size:clamp(52px,5vw,68px);line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);line-height:1.25;letter-spacing:-.02em}
h3{font-size:23px;line-height:1.4}
p{margin-bottom:20px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:var(--r-btn)}
::selection{background:var(--mint-soft);color:var(--text)}
.no-break{white-space:nowrap}
.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)}
.sec{padding-top:72px;padding-bottom:72px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p{color:var(--muted)}
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid>*,.wrap>*,.reading-wrap>*,[role="tabpanel"]{min-width:0}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:24px;color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.card,.panel{padding:24px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shadow-panel)}
.panel-inset{padding:20px;background:var(--groove);border-radius:var(--r-md);box-shadow:inset 0 1px 3px var(--groove-inset)}
.prose{overflow-wrap:break-word}
.prose p{line-height:1.9}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose ul{list-style:disc;padding-left:24px;margin-bottom:24px}
.prose ol{padding-left:26px;margin-bottom:24px}
.prose li+li{margin-top:8px}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--groove);border-radius:var(--r-btn);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--groove);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{padding:0;white-space:pre;overflow-wrap:normal}
.btn{display:inline-flex;align-items:center;justify-content:center;min-width:172px;min-height:46px;padding:9px 28px;border-radius:var(--r-btn);font-size:16px;font-weight:600;line-height:1.5;letter-spacing:.02em;gap:8px;transition:transform var(--duration-fast) ease,box-shadow var(--duration-fast) ease,background-color var(--duration-fast) ease}
.btn-primary{background:var(--accent);color:var(--text);border:1.5px solid var(--accent);box-shadow:0 10px 24px -12px var(--cta-shadow),inset 0 1px 0 var(--glow)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 14px 28px -12px var(--cta-shadow),inset 0 1px 0 var(--glow)}
.btn-primary:active{transform:translateY(0);box-shadow:inset 0 1px 3px var(--groove-inset)}
.btn-ghost,.btn-secondary{background:transparent;color:var(--text);border:1.5px solid var(--text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--groove);border-color:var(--border);color:var(--muted);box-shadow:none;transform:none}
.btn-small{min-width:0;min-height:36px;padding:6px 16px;font-size:14px}
.cta-row{margin-top:20px;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.announce{min-height:34px;display:flex;align-items:center;justify-content:center;gap:14px;padding:0 16px;background:var(--ink-bar);color:var(--announce-muted);font-size:13px;line-height:1.5}
.announce-tag{display:inline-flex;align-items:center;height:22px;padding:0 12px;border-radius:var(--r-pill);background:var(--accent);color:var(--ink-bar);font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.14em;flex-shrink:0}
.announce-text{color:var(--announce-text);letter-spacing:.01em}
.announce-link{display:inline-flex;align-items:center;min-height:24px;color:var(--white);font-weight:600;margin-left:4px}
.announce-link:hover{text-decoration:underline;text-underline-offset:3px}
.stage{background-color:var(--bg-bottom);background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px),linear-gradient(180deg,var(--bg-top) 0%,var(--bg-bottom) 100%);background-size:56px 56px,56px 56px,100% 100%;background-position:center top,center top,0 0;overflow-x:clip;max-width:100%}
#site-header{position:relative;z-index:100}
.topnav{position:relative;z-index:103;border-bottom:1px solid var(--border-soft);background:var(--bg-top)}
.stage .topnav{background:transparent}
.topnav-inner{max-width:1440px;margin:0 auto;height:58px;padding:0 32px;display:flex;align-items:center;flex-wrap:nowrap;gap:0}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:34px}
.brand-mark{display:block;width:30px;height:30px;filter:drop-shadow(0 4px 8px var(--shadow-deep))}
.brand-name{font-family:var(--font-display);font-size:18px;font-weight:700;letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.desktop-nav{flex:1;min-width:0}
.tabs{display:flex;align-items:center;list-style:none;margin:0 0 0 24px;padding:0;height:58px;gap:0}
.nav-more{position:relative}
.nav-more-toggle{display:flex;align-items:center;height:58px;padding:0 10px;border:0;background:transparent;font:inherit;font-size:14px;color:var(--muted);white-space:nowrap;cursor:pointer}
.nav-more-toggle::after{content:"⌄";margin-left:6px}
.nav-more-panel{position:absolute;right:0;top:100%;z-index:110;min-width:200px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.tabs .nav-more-panel a{height:auto;min-height:44px;padding:10px 12px}
.nav-more-panel a:hover{background:var(--groove)}
.tabs li{min-width:0;flex-shrink:0}
.tabs a{position:relative;display:flex;align-items:center;height:58px;padding:0 14px;font-size:14.5px;line-height:1.4;color:var(--muted);white-space:nowrap;transition:color var(--duration-fast) ease}
.tabs a:hover{color:var(--text)}
.tabs a.is-active{color:var(--text);font-weight:600}
.tabs a.is-active::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:2px;border-radius:var(--r-btn);background:var(--accent)}
.nav-tools{margin-left:auto;display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:34px;padding:0 10px;background:transparent;border:0;border-radius:var(--r-btn);font-size:14px;color:var(--text-2);cursor:pointer;white-space:nowrap}
.lang:hover{background:var(--groove)}
.lang-caret{font-size:11px;color:var(--muted)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:110;min-width:180px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-btn);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--groove);color:var(--text)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:34px;padding:0 18px;border-radius:var(--r-btn);background:var(--text);color:var(--white);font-size:14px;font-weight:600;line-height:1.4;white-space:nowrap;box-shadow:0 6px 14px -8px var(--shadow-cyan)}
.btn-login:hover{background:var(--ink-bar)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;z-index:102;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)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 16px;border-bottom:1px solid var(--border-soft)}
.mobile-drawer a.is-active{border-left:3px solid var(--cyan);background:var(--groove);font-weight:600}
.drawer-languages{margin-top:24px}
.drawer-label{font-family:var(--font-mono);color:var(--muted);font-size:12px;margin:0 16px 8px}
.menu-veil{position:fixed;z-index:101;inset:var(--header-edge) 0 0;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:24px;border-top:1px solid var(--border);background:var(--groove)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px}
.footer-brand p{max-width:330px;margin:16px 0;color:var(--muted);font-size:14px}
.footer-title{font-size:14px;font-weight:600;letter-spacing:.02em;margin-bottom:14px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-2)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:4px;color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:24px;color:var(--muted);font-size:13px}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity var(--duration-reveal) ease,transform var(--duration-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;width:100%;min-width:0;min-height:160px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.decor-region{position:relative;overflow-x:clip;max-width:100%}
.decor-glow{position:absolute;inset:10% 12%;pointer-events:none;background:radial-gradient(ellipse,var(--mint-wash),var(--glow-0) 70%);border-radius:var(--r-round)}
@media(min-width:1041px) and (max-width:1240px){
  .tabs{margin-left:24px;gap:2px}
  .tabs a{padding:0 8px;font-size:13px}
  .tabs a.is-active::after{left:8px;right:8px}
  .nav-tools{gap:8px}
}
@media(max-width:1040px){
  .topnav-inner{height:58px;padding:0 20px}
  .desktop-nav{display:none}
  .nav-tools{margin-left:auto;gap:8px}
  .menu-toggle{display:inline-flex}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .grid-5{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,7vw,40px)}
  .grid-3{grid-template-columns:1fr}
  .sec{padding-top:48px;padding-bottom:48px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .announce{padding:8px 12px;flex-wrap:wrap;gap:8px;font-size:12px;text-align:center}
  .topnav-inner{padding-inline:12px}
  .brand{gap:6px}
  .brand-mark{width:26px;height:26px}
  .brand-name{font-size:16px}
  .nav-tools{gap:4px;margin-left:auto}
  .lang{font-size:12px;padding:0 6px}
  .btn-login{padding:0 12px;font-size:13px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start}
  .grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tilt,.decor-tilt,[data-tilt]{transform:none}
  .decor-glow{max-width:100%}
  .card,.panel{padding:20px}
  .btn{min-width:0}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none}
}