:root{
  --bg:#F9F0E2;--hero-top:#FBF6EC;--hero-bottom:#F2E7D4;
  --panel:#FFFBF4;--panel-2:#EFE4D1;--panel-3:#F6EEE1;
  --border:#E2D4BD;--border-soft:#ECE1CF;
  --accent:#5A22E6;--accent-hi:#6A36EE;--accent-dark:#3B1496;--violet-deep:#2A0F6E;--cobalt:#2D5BE3;
  --text:#2A1F17;--ink-2:#4A3B30;--muted:#6E5F52;
  --success:#2F8F4E;--warn:#D9731C;--error:#C9373A;
  --on-accent:#FFFFFF;--on-accent-soft:rgb(255 255 255 / .72);
  --v-50:#F3EEFC;--v-100:#E6DCF8;--v-200:#CFC0EE;--v-ink:#46357F;
  --o-50:#FBF0E3;--o-100:#F5DEC6;--o-200:#EBC6A0;--o-300:#DFAB7D;--o-ink:#7E4317;
  --g-100:#DCEBDD;--g-200:#BCDAC2;--g-300:#94C4A1;--g-ink:#1E5A33;
  --n-100:#EAE2D6;--n-200:#D9CEBF;--n-300:#C3B6A5;--n-ink:#4C4137;
  --rail:#2A1F17;--rail-2:#3B2D23;--rail-fg:#CBBCA9;--rail-hi:rgb(255 251 244 / .09);
  --hilite:rgb(255 255 255 / .9);--hilite-soft:rgb(255 255 255 / .55);--hilite-cta:rgb(255 255 255 / .26);
  --dot-ring:rgb(42 31 23 / .16);
  --shadow-v:rgb(90 34 230 / .12);--shadow-v-soft:rgb(90 34 230 / .07);--shadow-v-cta:rgb(90 34 230 / .30);
  --shadow-b:rgb(74 50 28 / .10);--shadow-b-soft:rgb(74 50 28 / .06);
  --grain:rgb(74 48 28 / .03);--wash:rgb(90 34 230 / .05);--clear:transparent;
  --veil:rgb(42 31 23 / .32);
  --r-sm:6px;--r-md:8px;--r-under:10px;--r-flag:3px;--r-dot:50%;--r-pill:999px;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --font-mono-cjk:'JetBrains Mono','Noto Sans SC','PingFang SC','Microsoft YaHei',ui-monospace,monospace;
  --gutter:24px;--content-width:1328px;--section-space:64px;
  --header-height:94px;--toc-offset:16px;--anchor-offset:100px;
  --text-xs:12px;--text-sm:14px;--text-base:16px;--text-lead:19px;
  --weight-normal:400;--weight-medium:500;--weight-bold:700;--weight-heavy:900;
  --shadow-card:inset 0 1px 0 var(--hilite),0 8px 16px -12px var(--shadow-b);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;font-family:var(--font-body);font-size:var(--text-base);line-height:1.7;color:var(--text);background-color:var(--bg);background-image:radial-gradient(var(--grain) .7px,var(--clear) 1px),radial-gradient(var(--grain) .7px,var(--clear) 1px);background-size:3px 3px,5px 5px;background-position:0 0,1px 2px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-underline-offset:.2em}
img{max-width:100%;height:auto;display:block}
svg{width:24px;height:24px;flex-shrink:0;vertical-align:middle}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--wash)}
button{border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel)}
button:disabled{cursor:not-allowed}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--font-display);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.6vw,66px);font-weight:900;letter-spacing:-.02em;margin:0 0 20px}
h2{font-size:clamp(28px,3vw,40px);font-weight:800;letter-spacing:-.02em;margin:0 0 20px}
h3{font-size:22px;font-weight:750;margin:0 0 12px}
p{margin:0 0 18px}
ul,ol{padding-left:1.4em}
code{font-family:var(--font-mono-cjk);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-sm);padding:.12em .35em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-md)}
pre code{padding:0;white-space:pre;overflow-wrap:normal;background:var(--clear)}
table{border-collapse:collapse}
th,td{word-break:keep-all}
th{font-weight:700;text-align:left}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.reading-wrap{max-width:900px}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono-cjk);font-variant-numeric:tabular-nums}
.accent{color:var(--accent)}
.lead{font-size:var(--text-lead);color:var(--muted);line-height:1.6}
.grid{display:grid;gap:20px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.card,.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-card);min-width:0}
.panel{padding:24px}
.panel-sunk{background:var(--panel-2)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:50px;padding:10px 26px;border:0;border-radius:var(--r-md);font-family:var(--font-body);font-size:16px;font-weight:700;line-height:1.4;letter-spacing:.01em;text-decoration:none;flex-shrink:0;white-space:nowrap;transition:transform .15s ease,box-shadow .15s ease,background-color .15s ease}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(180deg,var(--accent-hi),var(--accent));color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hilite-cta),0 14px 28px -12px var(--shadow-v-cta),0 2px 4px -1px var(--shadow-v)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hilite-cta),0 18px 32px -12px var(--shadow-v-cta)}
.btn-primary:active{transform:translateY(1px);background:var(--accent-dark)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);border:1.5px solid var(--ink-2);box-shadow:inset 0 1px 0 var(--hilite),0 8px 18px -14px var(--shadow-b)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel-2)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;transform:none;pointer-events:none}
.btn-small{min-height:38px;padding:8px 14px;font-size:14px}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:18px}
.statusbar{min-height:34px;display:flex;align-items:center;justify-content:center;gap:10px;padding:6px 16px;background:linear-gradient(90deg,var(--accent),var(--accent-dark) 46%,var(--cobalt));color:var(--on-accent);font-size:13.5px;font-weight:600;line-height:1.6;letter-spacing:.01em;text-align:center}
.sb-sep{width:4px;height:4px;border-radius:var(--r-dot);background:var(--on-accent-soft);flex:none}
.sb-soft{color:var(--on-accent-soft);font-weight:500}
#site-header{position:relative;z-index:50}
.topnav{position:relative;z-index:53;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:0 8px 20px -16px var(--shadow-b)}
.topnav .wrap{display:flex;align-items:center;min-height:60px;gap:12px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.logo{width:32px;height:32px;flex:none;border-radius:var(--r-md);box-shadow:0 6px 14px -6px var(--shadow-v-cta)}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.02em;color:var(--text)}
.brand-zh{font-size:13.5px;font-weight:500;color:var(--muted);padding-left:10px;border-left:1px solid var(--border)}
.desktop-nav{flex:1;min-width:0}
.nav-links{display:flex;align-items:center;list-style:none;margin:0 0 0 22px;padding:0;gap:2px}
.nav-links li{min-width:0}
.nav-links a{display:inline-flex;align-items:center;gap:6px;padding:8px 10px;border-radius:var(--r-sm);font-size:14px;font-weight:500;line-height:1.5;color:var(--ink-2);text-decoration:none;white-space:nowrap;transition:background-color .15s ease,color .15s ease}
.nav-links a:hover{background:var(--panel-2);color:var(--text)}
.nav-links a[aria-current="page"]{background:var(--panel-2);color:var(--text);font-weight:600;box-shadow:inset 0 0 0 1px var(--border)}
.ni{width:16px;height:16px;flex:none}
.nav-right{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}
.lang-select{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;width:auto;padding:6px 10px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);font-size:13.5px;font-weight:500;line-height:1;color:var(--ink-2);white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:14px;height:14px}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:60;width:180px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:0 14px 28px var(--shadow-b)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:8px 16px;border-radius:var(--r-sm);background:var(--text);color:var(--panel);font-size:14px;font-weight:600;line-height:1.4;text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hilite-cta),0 6px 14px -8px var(--shadow-b)}
.btn-login:hover{background:var(--ink-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;color:var(--text);background:var(--panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-sm)}
.nav-drawer{position:fixed;z-index:52;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel);border-top:1px solid var(--border)}
.nav-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:10px 14px;text-decoration:none;border-radius:var(--r-sm)}
.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:51;top:var(--header-height);right:0;bottom:0;left:0;background:var(--veil);border:0;border-radius:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:40px}
.footer-brand p{color:var(--muted);font-size:14px;max-width:340px;margin-top:18px}
.footer-heading{font-size:15px;font-weight:700;margin:0 0 12px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;text-decoration:none;color:var(--ink-2)}
.footer-links a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:30px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:13px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a{min-height:24px}
.reveal{transition:opacity .35s ease,transform .35s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:static;min-height:48px;min-width:0;max-width:100%;overflow:hidden;margin:20px 0}
#server-status+*{margin-top:24px}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
.prose img{border-radius:var(--r-md)}
@media(min-width:1101px){
  html[lang="en"] .nav-links,html[lang="ja"] .nav-links,html[lang="ko"] .nav-links{gap:5px;margin-left:8px}
  html[lang="en"] .nav-links a,html[lang="ja"] .nav-links a,html[lang="ko"] .nav-links a{font-size:12px;padding-inline:5px}
}
@media(max-width:1200px){.nav-links{margin-left:6px}.nav-links a{padding-inline:6px;font-size:13px}.nav-right{gap:6px}}
@media(max-width:1100px){.desktop-nav{display:none}.menu-toggle{display:inline-flex}.nav-right{margin-left:auto}.footer-grid{gap:24px}}
@media(max-width:768px){
  :root{--gutter:20px;--section-space:44px}
  h1{font-size:clamp(28px,6vw,40px)}
  h2{font-size:28px}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.scene{transform:none}
  .decor,.stripe-halo{max-width:100%}
  .nav-right{gap:5px;margin-left:auto}
  .topnav .wrap{gap:8px}
  .brand{gap:6px}
  .brand-en{font-size:16px}
  .logo{width:28px;height:28px}
  .btn-login{padding-inline:10px;font-size:13px}
  .lang{padding-inline:7px;font-size:11px}
  .lang svg{display:none}
  .brand-zh{display:none}
  .statusbar{font-size:11px;gap:6px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .panel{padding:18px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}