:root{
  --bg:#F9F1E3;--bg-top:#FCF7EE;--bg-bottom:#F3E9D7;--panel:#FFFBF3;--panel-2:#F1E7D5;--paper:#FFFFFF;
  --border:#E3D6BF;--border-soft:#ECE1CD;--accent:#22C4AC;--accent-hi:#3CD4BE;--accent-dark:#0E7C6C;--accent-tint:rgba(34,196,172,.16);
  --lav:#8F8BF0;--lav-30:rgba(143,139,240,.30);--lav-tint:rgba(143,139,240,.20);
  --indigo:#1D2148;--indigo-lift:#2A3070;--indigo-tint:rgba(29,33,72,.08);
  --text:#2B2119;--muted:#6E5F50;--faint:#958571;--cream:#FBF0DB;--on-dark:#FFFBF3;--on-dark-muted:rgba(255,251,243,.70);
  --success:#1F9D5A;--success-ring:rgba(31,157,90,.28);--warn:#C98512;--error:#C8412F;
  --chrome-dot:#DCCDB3;--grain:#2B2119;--flag-red:#D7302B;--flag-white:#FFFFFF;--flag-blue:#2D3772;--flag-ring:rgba(43,33,25,.16);
  --veil:rgba(29,33,72,.32);--clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-card:32px;--r-panel:28px;--r-float:18px;--r-win:18px;--r-md:14px;--r-row:11px;--r-btn:10px;--r-xs:8px;--r-pill:999px;--r-circle:50%;
  --shadow-card:0 44px 96px -30px rgba(29,33,72,.12),0 16px 40px -14px rgba(29,33,72,.12);
  --shadow-win:0 30px 64px -20px rgba(8,10,32,.55),0 8px 20px -8px rgba(8,10,32,.35);
  --shadow-float:0 20px 44px -12px rgba(29,33,72,.10),0 6px 14px -4px rgba(29,33,72,.10);
  --shadow-soft:0 6px 16px -10px rgba(29,33,72,.20);
  --shadow-mint:0 12px 24px -12px rgba(14,124,108,.55);--shadow-ink:0 12px 24px -14px rgba(43,33,25,.55);--shadow-chip:0 1px 2px rgba(43,33,25,.06);
  --shadow-selected:0 10px 18px -10px rgba(29,33,72,.6);
  --shadow-toggle:inset 0 1px 2px rgba(14,124,108,.35);--shadow-toggle-knob:0 1px 3px rgba(14,124,108,.4);
  --hl-light:inset 0 1px 0 rgba(255,255,255,.9),inset 0 0 0 1px rgba(255,255,255,.55);
  --hl-dark:inset 0 1px 0 rgba(255,255,255,.10),inset 0 0 0 1px rgba(255,255,255,.04);
  --hl-btn:inset 0 1px 0 rgba(255,255,255,.35);
  --groove:inset 0 1px 2px rgba(43,33,25,.07),inset 0 0 0 1px rgba(227,214,191,.7);
  --gutter:56px;--page-width:1432px;--header-height:72px;--mobile-head:116px;--anchor-space:96px;--toc-space:96px;
  --size-body:16px;--size-small:14px;--size-h1:clamp(52px,calc(6vw - 18px),68px);--size-h2:clamp(28px,3vw,40px);--size-h3:22px;
  --weight-body:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;--weight-display:900;
  --ease:ease;--speed:.18s;--reveal-speed:.35s;--section-space:72px;--grain-opacity:.03;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:clip}
body::after{content:"";position:fixed;inset:0;z-index:60;pointer-events:none;background:var(--grain);opacity:var(--grain-opacity);-webkit-mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");-webkit-mask-size:180px 180px;mask-size:180px 180px}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
p,h1,h2,h3,h4,figure{margin:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:var(--size-h1);font-weight:var(--weight-display);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--size-h2);font-weight:var(--weight-heavy);line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--size-h3);line-height:1.4;font-weight:var(--weight-bold)}
:focus-visible{outline:2px solid var(--indigo);outline-offset:3px;border-radius:var(--r-xs)}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.mono{font-family:var(--font-mono)}
.muted{color:var(--muted)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two>*,.grid-three>*,.stage-grid>*,.footer-grid>*{min-width:0}
.stack{display:grid;gap:24px}
.card,.panel{min-width:0;padding:28px;border-radius:var(--r-panel);background:var(--panel);box-shadow:var(--shadow-float),var(--hl-light)}
.panel--groove{background:var(--panel-2);box-shadow:var(--groove)}
.section-head{display:grid;gap:16px;margin-bottom:32px;max-width:52em}
.section-head p{color:var(--muted);font-size:18px}
.kicker{font-family:var(--font-mono);font-size:13px;font-weight:var(--weight-semibold);color:var(--muted)}
.prose{max-width:76ch;min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:20px}
.prose h2{margin-top:48px;margin-bottom:20px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose a{text-decoration:underline;text-underline-offset:4px;color:var(--accent-dark)}
code{font-family:var(--font-mono);overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border-radius:var(--r-md)}
pre code{white-space:pre;overflow-wrap:normal;padding:0}
.reveal{transition:opacity var(--reveal-speed) var(--ease),transform var(--reveal-speed) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 26px;border:0;border-radius:var(--r-btn);font-size:16px;font-weight:var(--weight-bold);letter-spacing:.01em;transition:transform var(--speed) var(--ease);text-align:center}
.btn:hover,.btn.is-hover{transform:translateY(-1px)}
.btn:active{transform:translateY(1px)}
.btn svg{display:block;width:18px;height:18px}
.btn--mint,.btn-primary{background:linear-gradient(180deg,var(--accent-hi),var(--accent));color:var(--text);box-shadow:var(--shadow-mint),var(--hl-btn)}
.btn--ink,.btn-secondary{background:var(--text);color:var(--on-dark);box-shadow:var(--shadow-ink),var(--hl-dark)}
.btn--outline{background:var(--panel);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text)}
.btn--small{min-height:40px;padding:8px 18px;font-size:14px}
.btn.is-focus{outline:2px solid var(--indigo);outline-offset:3px}
.ic-line{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
#site-header{position:relative;z-index:100}
.ann{background:var(--indigo);color:var(--cream)}
.ann-in{display:flex;align-items:center;justify-content:center;gap:24px;min-height:44px}
.ann-text{font-size:14px;font-weight:var(--weight-medium);color:var(--on-dark-muted)}
.ann-text strong{color:var(--cream);font-weight:var(--weight-bold)}
.ann-sep{margin-inline:10px;color:var(--on-dark-muted)}
.ann-acts{display:flex;gap:10px;flex-shrink:0}
.ann-btn{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:4px 14px;border-radius:var(--r-xs);font-size:13px;font-weight:var(--weight-bold);transition:transform var(--speed) var(--ease)}
.ann-btn:hover{transform:translateY(-1px)}
.ann-btn--cream{background:var(--cream);color:var(--text);box-shadow:var(--hl-btn)}
.ann-btn--white{background:var(--paper);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text)}
.first{position:relative;background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 52%,var(--bg-bottom) 100%);overflow-x:clip;max-width:100%}
.mast{position:relative;z-index:103;border-bottom:1px solid var(--border-soft);background:var(--bg-top)}
.first .mast{background:var(--clear)}
.mast-in{display:flex;align-items:center;gap:40px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{display:block;width:34px;height:34px}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:var(--weight-heavy);letter-spacing:-.015em;color:var(--text)}
.tabs{flex:1;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:4px}
.tab{position:relative;display:flex;align-items:center;justify-content:center;min-height:72px;padding:0 14px;font-size:15px;font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:opacity var(--speed) var(--ease)}
.tab:hover{color:var(--text)}
.tab.is-active{color:var(--text);font-weight:var(--weight-bold)}
.tab.is-active::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:3px;border-radius:var(--r-xs) var(--r-xs) 0 0;background:var(--indigo)}
.mast-side{display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;min-width:44px;width:auto;padding:0 10px;border:0;background:var(--clear);border-radius:var(--r-btn);font-size:14px;font-weight:var(--weight-medium);color:var(--muted)}
.lang-t{white-space:nowrap}
.lang:hover{color:var(--text)}
.lang svg,.login svg{display:block;width:16px;height:16px}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:110;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 14px;border-radius:var(--r-xs)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--text)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:8px 18px;border-radius:var(--r-btn);background:var(--panel);color:var(--text);font-size:14px;font-weight:var(--weight-bold);box-shadow:inset 0 0 0 1.5px var(--text),var(--shadow-chip);transition:transform var(--speed) var(--ease);white-space:nowrap}
.login:hover{transform:translateY(-1px)}
.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(--border);border-radius:var(--r-btn);background:var(--panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-xs)}
.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{position:fixed;top:var(--mobile-head);right:0;left:0;z-index:102;height:calc(100dvh - var(--mobile-head));max-height:calc(100dvh - var(--mobile-head));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel)}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-btn);font-weight:var(--weight-semibold)}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-languages{display:grid;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--mobile-head) 0 0;z-index:101;background:var(--veil);border:0}
.footer{margin-top:48px;padding-top:56px;padding-bottom:28px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand{display:grid;align-content:start;gap:18px}
.footer-brand p{max-width:30em;color:var(--muted)}
.footer-title{font-size:16px;font-weight:var(--weight-bold);margin-bottom:14px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-search a{display:inline-flex;align-items:center;min-height:32px;color:var(--muted);padding-block:4px;overflow-wrap:anywhere}
.footer-links a:hover,.footer-search a:hover{color:var(--text);text-decoration:underline}
.footer-search{display:grid;gap:2px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:14px}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-bold);text-decoration:underline;text-underline-offset:5px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:24px;font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:80px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono);text-align:right}
@media(min-width:1181px) and (max-width:1360px){.mast-in{gap:20px}.tab{padding-inline:10px;font-size:14px}.mast-side{gap:8px}.lang{padding-inline:6px}}
@media(max-width:1180px){.mast-in{gap:24px}.tabs{display:none}.mast-side{margin-left:auto}.menu-toggle{display:inline-flex}.lang-t{display:none}}
@media(max-width:768px){h1{font-size:clamp(28px,6vw,40px)}.grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}.footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}}
@media(max-width:640px){
  :root{--gutter:20px;--section-space:48px;--mobile-head:148px}
  .no-break{white-space:normal}
  .ann-in{flex-wrap:wrap;gap:8px 12px;min-height:76px;padding-top:8px;padding-bottom:8px}
  .ann-text{width:100%;text-align:center;font-size:12px;line-height:1.2}
  .ann-sep{margin-inline:6px}.ann-btn{padding-inline:12px}
  .mast-in{gap:8px}.mast-side{gap:4px;margin-left:auto}
  .brand{gap:6px}.brand-mark{width:28px;height:28px}.brand-en{font-size:16px}
  .login{padding-inline:12px;gap:4px;font-size:13px}.login svg{display:none}
  .lang{padding-inline:8px}.lang svg{width:16px;height:16px}
  .card,.panel{padding:22px}.footer-links{gap:4px 12px}
  .tilt,[data-tilt]{transform:none}
  .first,.decorated{max-width:100%;overflow-x:clip}
}
@media(max-width:350px){:root{--gutter:16px}.brand-en{font-size:14px}.brand-mark{width:24px;height:24px}.login{padding-inline:10px}.mast-side{gap:2px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.reveal,.reveal.pending{opacity:1;transform:none}}